CN213845602U - Porous elbow type sleeve and casting mold thereof - Google Patents

Abstract

The utility model particularly relates to a porous elbow formula sleeve pipe and casting mold thereof, the front side of its characterized in that casing is open, the lower extreme opening, be equipped with the current-carrying subassembly in the casing, the casing internal surface, current-carrying subassembly surface is equipped with the semiconduction buffer layer, the conducting rod upper segment of current-carrying subassembly is equipped with casting or welds electrically conductive touch pad and cable core socket as an organic whole, the conducting rod hypomere extends out outside the casing, the outside is equipped with electrically conductive or semiconduction electric capacity screen, be equipped with the integrative insulator of parcel current-carrying subassembly and electric capacity screen outside the casing, be equipped with on the insulator and electrically conductive touch pad, the communicating supplementary jack of cable core socket, cable terminal jack, long and thin electric capacity type insulation support is constituteed jointly to electric capacity screen and its integrative insulator, electric capacity type insulation support's tail end installation is sealed, clamping ring electric capacity type insulation support and casing form thick lower thin elbow structure. The utility model has the advantages of compact structure, with low costs, good, the electric good of electric conductivity, sealing reliability is high, the security is high, application scope is wide.

Description

Porous elbow type sleeve and casting mold thereof

Technical Field

The utility model belongs to the technical field of high-voltage electrical, concretely relates to porous elbow formula sleeve pipe and casting mold thereof.

Background

In a traditional transformer substation, when the capacity of a transformer is small and the current of a low-voltage side is small, the transformer is generally directly connected by a cable; with the increase of the main transformer capacity of a transformer substation, a large-section low-voltage cable is directly used, the section of a cable core conductor is seriously enlarged due to the skin effect, the cable is not economical, and the large-current cable is too heavy and difficult to meet the requirement of field installation, so that a copper bar or an insulating copper pipe is usually used as a bus for connection in the past engineering.

The copper bar or the insulating copper tube used as the bus also has the defects of the copper bar or the insulating copper tube.

The copper bar is used as a bus, a sealing ring on the upper part of a sleeve on the low-voltage side of the transformer is stretched by the hard bus bar, so that oil leakage can occur due to nonuniform sealing, and after leaked oil is stained with dust, dirt is formed, the insulating creepage distance of the sleeve is insufficient, and discharging is easily generated after the sleeve is wet. In addition, the bus bar row is difficult to meet the requirements of bus bar heating and electrodynamic force technically and structurally, additional loss and an increase of skin effect coefficient are caused, and the current carrying capacity is reduced and the current distribution is uneven. When the capacity of a single main transformer exceeds 200MVA, the rated current and the short-circuit current on the low-voltage side of the transformer are increased, the problem of electric power and heating of a bus bar bridge and the problem of heating caused by induction eddy current in an alternating strong magnetic field by structures such as a bus bar bridge post insulator and a steel bracket exist on the outgoing line side of the low-voltage side of the main transformer, and once the bus bar is short-circuited, the bus bar, the post insulator and a transformer winding are damaged, so that the safety operation and the power supply reliability of a transformer substation are influenced. And electrical accidents caused by short circuit faults of small animals and lapping of foreign matters in the transformer substation also happen occasionally. In order to prevent short circuit of small animals, an exposed busbar is often coated with insulating paint or protected by thermal shrinkage insulation, but is easily aged or cracked after being exposed in an external environment for a long time, and the protective performance of insulation is affected under the condition of serious degree, so that potential safety hazards are easily caused.

The insulating tubular bus main body is a hollow copper tube or an aluminum alloy tube, an insulating layer is coated outside the insulating tubular bus main body, and the current density distribution on the cross section of a conductor of the insulating tubular bus main body is uniform. For the copper bar bus, the insulating tube bus is a progress, but along with the implementation of indoor transformer substation, main transformer and low voltage distribution device are more and more compact to be arranged, and spatial position is narrower and smaller, arranges with insulating copper tube bus scheme, and the flexibility is relatively poor, installs loaded down with trivial details, inconvenient construction.

Korean patent No. 20-2005-0033755 discloses a two-hole transformer elbow socket which effectively solves the defects of copper bars and tube bus bars by distributing cable loads through two bilaterally symmetrical cable insertion holes. However, the technical scheme also has obvious defects, mainly comprising the following steps:

1) according to the technical scheme, the conducting rod and the cable core socket are fixedly crimped through the bolt, the conducting performance is poor, and the contact resistance generates heat to easily cause insulation breakdown.

2) In the technical scheme, the insulating sleeve part has no capacitive screen, the electric field of the main insulation is not uniformly distributed, the electrical performance is poor, and the running safety performance is low.

3) The technical scheme does not have an auxiliary jack specially used for plugging a PT or a lightning arrester. The cross section of a conductor for plugging the PT or the lightning arrester is small, copper materials are wasted according to the design of a cable core socket, when the current is large, cable loads are not enough distributed by all cable terminal jacks, redundant jacks are not used for plugging the PT or the lightning arrester, the voltage cannot be monitored, a transformer cannot be protected, and insulation breakdown accidents of the transformer are easily caused.

4) In the technical scheme, the tail end of the insulating sleeve is not provided with a sealing element, and the problems of air leakage or oil leakage easily occur due to expansion with heat and contraction with cold caused by environmental change or under strong mechanical vibration.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a porous elbow formula sleeve pipe and casting mold thereof, it sets up supplementary jack and cable termination jack, and welding or casting become the current-carrying subassembly of an organic whole and bury inside the insulator, and electric capacity type insulation support and insulator are through vacuum pouring integrated into one piece, can improve the security of transformer substation's facility, make things convenient for equipment fixing such as transformer, convenient inspection and measurement.

The utility model discloses a realize through following technical scheme:

the porous elbow type sleeve is characterized by comprising a square shell, wherein the front side of the shell is open, the lower end of the shell is open, a current-carrying component is arranged in the shell, a semi-conductive buffer layer is arranged on the inner surface of the shell and the surface of the current-carrying component, the current-carrying component comprises a conductive rod, the upper section of the conductive rod is positioned in the shell and is provided with a conductive contact seat and a cable core socket which are cast or welded into a whole, the lower section of the conductive rod extends out of the shell, a conductive or semi-conductive capacitive screen is arranged outside the shell, an insulator which wraps the current-carrying component and the capacitive screen into a whole is arranged outside the shell, the insulator is provided with the conductive contact seat, the auxiliary jack, the cable terminal jack, the capacitive screen and the integrated insulator form a slender capacitive type insulating sleeve together, the tail end of the capacitive type insulating sleeve is provided with a sealing pressure ring, and the capacitive type insulating sleeve and the shell form an elbow-shaped structure with a thick upper part and a thin lower part.

The utility model discloses the equipment is vacuum again and is pour insulator integrated into one piece after finishing, and the insulator is epoxy.

Further, the utility model discloses an inside electric capacity screen of electric capacity type insulation support is carbon fiber electric capacity screen.

Furthermore, the two conductive contact seats of the utility model are symmetrically arranged at the two sides of the conductive rod through the copper bar, the number of the auxiliary jacks is matched with the conductive contact seats,

further, the utility model discloses a cable core socket is equipped with 4, and two are a set of, installs in the both sides of conducting rod through the copper bar symmetry, and the quantity of cable terminal jack matches with the cable core socket.

Further, the utility model discloses a conductive contact seat cross-section is less than the cross-section of cable core socket.

Further, the utility model discloses a casing internal surface, current-carrying subassembly surface are equipped with the semi-conductive buffer layer.

The utility model discloses a semiconduction buffer layer is epoxy resin base semiconduction glue, perhaps adopts semiconductive paper or semiconductive cloth that can permeate epoxy.

Further, the utility model discloses a casing divide into casing and lower casing, goes up the casing and passes through bolted connection with lower casing.

The utility model discloses a casing lower part sets up the ring flange for be connected with sleeve pipe oil end forming die.

As a preferred scheme, the utility model discloses an upper housing is greater than lower casing.

The shell of the utility model is preferably but not limited to a metal shell, and is sturdy and durable.

The utility model discloses porous elbow formula sheathed tube manufacturing method, its characterized in that step is as follows:

1) preparing a copper rod as a conductive rod, wherein the upper section of the conductive rod is cast or welded with a copper bar, the copper bar is cast or welded with a cable core socket and a conductive contact seat to form a current-carrying assembly, the outer surface of the current-carrying assembly is coated with a semi-conductive buffer layer, and the lower section of the conductive rod is fixed with a prefabricated carbon fiber capacitive screen by an insulating fixing ring;

2) an opening at the lower end of the shell is connected with a casing oil end forming die, a layer of grounding shielding net is laid on the inner surface of the casing oil end forming die, and the grounding shielding net is fixed on the inner wall of the shell through a grounding bolt;

3) the upper section of the conducting rod, the cable core socket and the conducting contact seat are arranged in the shell, the lower section of the conducting rod, the carbon fiber capacitive screen and the carbon fiber capacitive screen are fixed in a tail end sleeve oil end forming die, a conducting or semi-conducting shielding ring is connected to the opening part of the cable core socket and is fixed by a conducting belt, a layer of semi-conducting buffer layer is coated or attached to the inner surface of the shell, and a front end template with a core and the shell are combined together to form a closed complete die to be poured;

4) pre-drying the die at a constant temperature of 130 ℃ for 5 hours, tightly covering a pouring gate of the die, and transferring the die into a normal-temperature drying oven for cooling, wherein the temperature of a matrix of the cooled die is tested to be 62 ℃;

5) preparing epoxy resin mixed materials, standing for 10min, and preparing for pouring at the temperature of 70-75 ℃ of the final mixed materials;

6) rapidly vacuumizing the mould through a vacuumizing port, and starting to discharge and cast from a glue injection port when the vacuumizing time is up;

7) transferring the poured casting model into a curing furnace, carrying out gel treatment at 70 ℃ for 6h, then raising the temperature of the curing furnace to 80 ℃ for curing for 2h, curing and forming, removing the casting mold from the mold, demoulding, transferring into the curing furnace, and carrying out later-stage curing and cooling to room temperature;

8) and (5) mounting a sealing press ring at the tail end of the elbow type sleeve, and finishing the manufacture.

The utility model discloses porous elbow formula sheathed tube casting mold, including the casing, its characterized in that still includes front end template and sleeve pipe oil end forming die, and the front end template is installed in the front side of casing, and its inboard is equipped with the core, is equipped with in the front end template with the inside communicating evacuation mouth of casing, sleeve pipe oil end forming die be upper end open-ended cavity tubular structure, and its upper end is connected with the lower extreme opening of casing, and its inner chamber matches with electric capacity type insulation support's shape, and its one side is equipped with the communicating injecting glue mouth with the inner chamber.

The utility model has the advantages of it is following and positive effect:

1) the utility model discloses the current-carrying subassembly that welds or casts integrative has good electric conductivity, and this structure does not have the bolt, and non-crimping can avoid the insulating breakdown that bolt crimping structure contact resistance generated heat and arouses effectively;

2) the electric field distribution of the capacitive insulating sleeve is more uniform, the good electrical performance is ensured, and the running safety of the sleeve is improved; meanwhile, the thickness of the insulating layer under the same voltage is reduced, and resin materials are saved;

3) the utility model is provided with an auxiliary jack which is specially used for plugging a PT or a lightning arrester and is respectively used for measuring voltage and protecting equipment such as a transformer, and a conductive contact seat of the auxiliary jack adopts a smaller conductor section, thereby saving copper materials;

4) the tail end of the capacitive insulating sleeve is provided with the sealing compression ring, so that the problem of air leakage or oil leakage caused by expansion with heat and contraction with cold or under strong mechanical vibration due to environmental change can be effectively solved, and the reliability of sleeve sealing is ensured;

5) the shell of the utility model is divided into an upper shell and a lower shell, and the two shells are connected by bolts, so that the whole production and installation are convenient;

6) the main body of the utility model adopts high-performance epoxy resin to be integrally molded by vacuum casting, thereby not only being waterproof and moistureproof and resistant to mechanical damage, but also effectively overcoming the electrical accidents caused by short circuit faults of small animals and foreign body lapping;

7) the product shell of the utility model is fully shielded, has no outer leakage charged body, has compact integral structure and small volume, and saves installation space;

8) the utility model fully utilizes the power cables produced in batch as the bus, which can reduce the total cost of the system;

9) the utility model discloses application scope is wide, can be used to the transformer and be qualified for the next round of competitions the connection that also can be used to other equipment, for example high tension switchgear.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is a schematic structural view of the current-carrying assembly of the present invention;

fig. 4 is a schematic structural diagram of the vacuum casting apparatus of the present invention.

As shown in the figure: 1. an auxiliary jack; 2. a cable terminal jack; 3. an upper housing; 4. an insulator; 5. a lower housing; 6. a current carrying component; 7. a capacitive type insulating sleeve; 8. sealing the pressure ring; 9. a conductive contact base; 10. a cable core socket; 11. a conductive rod; 12. a semiconductive buffer layer; 13. a ground bolt; 14. a grounded shielding mesh; 15. a carbon fiber capacitive screen; 16. an insulating fixing ring; 17. a shield ring; 18. copper bars; 19. a casing oil end forming die; 20. a glue injection port; 21. a vacuum pumping port; 22. a front end template; 23. and (3) a core.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, 2, and 3: the square metal shell consists of a larger upper shell 3 and a smaller lower shell 5, the upper shell 3 is connected with the lower shell 5 through bolts, the lower end of the lower shell 5 is provided with an opening and a flange, the front side of the whole shell is opened and arranged, a current-carrying assembly 6 is arranged in the shell, the current-carrying assembly 6 comprises 1 conducting rod 11, two conducting contact seats 9 and 4 cable core sockets 10, the upper section of the conducting rod 11 is positioned in the shell, the two conducting contact seats 9 are welded and symmetrically arranged on two sides of the conducting rod 11 through copper bars 18, two groups of the 4 cable core sockets 10 are welded and symmetrically arranged on two sides of the conducting rod 11 through the copper bars 18, the section of each conducting contact seat 9 is smaller than that of each cable core socket 10, the lower section of the conducting rod 11 extends out of the shell through the opening at the lower end of the shell, a carbon fiber capacitive screen 15 is arranged outside the lower section of the conducting rod 11, and an integrated insulator 4 wrapping the current-carrying assembly 6 and the carbon fiber capacitive screen 15 is arranged outside the shell, an auxiliary jack 1 and a cable terminal jack 2 which are communicated with a conductive contact seat 9 and a cable core socket 10 are arranged on an insulator 4 in the shell, a carbon fiber capacitive screen 15 and the insulator 4 integrated with the carbon fiber capacitive screen jointly form a slender capacitive insulating sleeve 7, a sealing press ring 8 is arranged at the tail end of the capacitive insulating sleeve 7, and the capacitive insulating sleeve 7 and the shell form an elbow-shaped structure with a thick upper part and a thin lower part.

As shown in fig. 4, the utility model discloses during the preparation, need use front end template 22 and sleeve pipe oil end forming die 19, be equipped with on the front end template 22 with supplementary jack 1, the core 23 that cable terminal jack 2 matches, sleeve pipe oil end forming die 19 is upper end open-ended tubular structure, its upper end be equipped with down casing 5 go up the ring flange that the ring flange matches, sleeve pipe oil end forming die 19's inner chamber and capacitive type insulation support 7's appearance match.

The utility model discloses before the pouring, prepare a diameter phi 48's copper pole as conducting rod 11, 11 upper segments of conducting rod and copper bar 18, copper bar 18 and cable core socket 10 and electrically conduct touch 9 casts or welds as an organic wholely, constitute current-carrying subassembly 6. The metal outer surface of the current-carrying assembly 6 is coated with a layer of semi-conductive buffer layer 12, and the lower section of the conductive rod 11 is fixed with a prefabricated carbon fiber capacitive screen 15 by an insulating fixing ring 16. The lower shell 5 is connected with a casing oil end forming die 19 through a flange, a layer of grounding shielding net 14 is laid on the inner surface of the casing oil end forming die 19, and the grounding shielding net 14 is fixed on the inner wall of the lower shell 5 through a grounding bolt 13. The current-carrying assembly 6 with the carbon fiber capacitive screen 15 penetrates through the lower shell 5 and is fixed in the tail end sleeve oil end forming die 19. A conductive or semi-conductive shielding ring 17 is connected to the opening of the cable core socket 10 and fixed by a conductive belt. A layer of semiconductive buffer layer 12 is coated or pasted on the inner surfaces of the upper shell 3 and the lower shell 5, and then the upper shell and the lower shell are firmly connected through bolts. Finally, the front end template 22 with the core 23 and the shell are combined together to form a closed complete mold to be poured.

The utility model discloses during the pouring, earlier with the mould at 130 ℃ under the constant temperature prebake 5h, cool down in the immigration normal atmospheric temperature drying cabinet behind the mould sprue lid is tight, the mould base member temperature after the test cooling is 62 ℃. And (3) preparing epoxy resin mixed materials, including epoxy resin, a curing agent and the like, standing for 10min, and preparing for pouring at the temperature of 70-75 ℃ of the final mixed materials. The mold is quickly vacuumized through the vacuumizing port 21, and the material is discharged and poured from the glue injection port 20 after the vacuumizing time, so that the whole process can achieve low viscosity, high vacuum and slow pouring as far as possible.

The utility model discloses the back that finishes of pouring, the pouring model that finishes with the pouring shifts over to the curing oven that sets up in advance, and the time that the minimize dwells in low temperature environment avoids because the mould temperature descends, influences the mobility of material in the mould. Gel processing at 70 ℃ for 6h, and then curing for 2h by raising the temperature of a curing oven to 80 ℃ to cure and shape. And (4) transferring the casting mould out of the mould, demoulding, and then transferring the casting mould into a curing furnace for later curing and cooling to room temperature.

And finally, mounting a sealing compression ring 8 at the tail end of the elbow type sleeve, and finishing the manufacture of the elbow type sleeve integrally formed by vacuum casting.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims (8)

1. A porous elbow type sleeve is characterized by comprising a square shell, wherein the front side of the shell is open, the lower end of the shell is open, a current-carrying component is arranged in the shell, a semi-conductive buffer layer is arranged on the inner surface of the shell and the surface of the current-carrying component, the current-carrying component comprises a conductive rod, the upper section of the conductive rod is positioned in the shell and is provided with a conductive contact seat and a cable core socket which are cast or welded into a whole, the lower section of the conductive rod extends out of the shell, a conductive or semi-conductive capacitive screen is arranged outside the shell, an insulator which wraps the current-carrying component and the capacitive screen into a whole is arranged outside the shell, the insulator is provided with the conductive contact seat, the auxiliary jack, the cable terminal jack, the capacitive screen and the integrated insulator form a slender capacitive type insulating sleeve together, the tail end of the capacitive type insulating sleeve is provided with a sealing pressure ring, and the capacitive type insulating sleeve and the shell form an elbow-shaped structure with a thick upper part and a thin lower part.

2. The porous elbow bushing of claim 1, wherein the capacitive screen inside the capacitive insulating bushing is a carbon fiber capacitive screen.

3. The multi-hole elbow type bushing as claimed in claim 1, wherein there are two conductive contact seats, which are symmetrically installed on both sides of the conductive rod through copper bars, and the number of the auxiliary insertion holes matches with the number of the conductive contact seats.

4. The multi-hole elbow type bushing of claim 1, wherein the number of cable core sockets is 4, two are in a group, and the cable core sockets are symmetrically arranged on two sides of the conducting rod through copper bars, and the number of cable terminal jacks is matched with the number of cable core sockets.

5. The perforated elbow casing according to claim 1, 3 or 4, wherein the cross-section of the electrically conductive contact pad is smaller than the cross-section of the cable core socket.

6. The porous elbow bushing of claim 1, wherein the semi-conductive buffer layer is epoxy resin based semi-conductive glue or semi-conductive paper or semi-conductive cloth that is permeable to epoxy resin.

7. The perforated elbow casing according to claim 1 or 6, wherein the housing is divided into an upper housing and a lower housing.

8. A casting mold for the porous elbow type casing pipe of claim 1, which comprises a shell, and is characterized by further comprising a front end template and a casing pipe oil end forming mold, wherein the front end template is installed on the front side of the shell, a mold core is arranged on the inner side of the front end template, a vacuum pumping port communicated with the interior of the shell is arranged on the front end template, the casing pipe oil end forming mold is of a hollow cylindrical structure with an upper end opened, the upper end of the casing pipe oil end forming mold is connected with the lower end opening of the shell, an inner cavity of the casing pipe oil end forming mold is matched with the shape of a capacitive type insulating casing pipe, and a glue injection port communicated with the inner cavity is arranged on one side of the casing pipe oil end forming mold.

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