阅读说明：本技术 一种可调接触面积的套管螺纹电连接装置 (Sleeve threaded electric connection device with adjustable contact area ) 是由 邹德旭 沈龙 钱国超 周仿荣 彭庆军 黄克捷 程建伟 赵林杰 雷园园 颜冰 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种可调接触面积的套管螺纹电连接装置,可通过调节旋钮改变可伸缩螺母组的高度,以此改变接线端子和接线座的螺纹连接接触面积,进而调整套管螺纹电连接结构的电流承载能力。本装置结构简单,操作方便,可调节螺纹连接的接触面积；无需进行结构拆卸；可在运行前和运行中调节；可伸缩螺母组分三层接触螺母,可根据实际情况选择适当的高度；接触螺母具有卡位功能,保证装置不会发生滑动,具有一定稳定性。(The invention discloses a sleeve threaded electric connection device with an adjustable contact area, which can change the height of a telescopic nut group through an adjusting knob so as to change the threaded connection contact area of a wiring terminal and a wire holder and further adjust the current carrying capacity of a sleeve threaded electric connection structure. The device has simple structure and convenient operation, and can adjust the contact area of the threaded connection; the structure is not required to be disassembled; can be adjusted before and during operation; the telescopic nut component is a three-layer contact nut, and the proper height can be selected according to the actual situation; the contact nut has a clamping function, so that the device cannot slide and has certain stability.)

1. The utility model provides an adjustable area of contact's sleeve pipe screw thread electric connection device which characterized in that: the connecting structure comprises a current-carrying bottom plate (1) and a connecting terminal (2), wherein end plates of the current-carrying bottom plate (1) and the connecting terminal (2) are connected through an external thread connecting screw rod (3), and a telescopic nut group is sleeved on the upper thread of the connecting screw rod (2);

the telescopic nut group comprises an inner layer contact nut (4), a middle layer contact nut (5) and an outer layer contact nut (6) which are overlapped and telescopic, the bottom of the outer layer contact nut (6) is fixedly connected with the wiring terminal (2), the outer diameter of the inner layer contact nut (4) is equal to the inner diameter of the middle layer contact nut (5), and the inner diameter of the middle layer contact nut (5) is equal to the outer diameter of the outer layer contact nut (6);

the outer wall of the inner-layer contact nut (4) is provided with an inner-layer tooth groove convex strip (9), the inner wall of the middle-layer contact nut (5) is provided with an inner-layer convex strip mounting groove corresponding to the inner-layer tooth groove convex strip (9), the outer wall of the middle-layer contact nut (5) is provided with a middle-layer tooth groove convex strip (10), and the outer-layer contact nut (6) is provided with a middle-layer convex strip mounting groove corresponding to the middle-layer tooth groove convex strip (10);

same operation swing arm (7) is worn to be equipped with perpendicularly to the level on the outer wall of middle level contact nut (5) and outer contact nut (6), operation swing arm (7) correspond inlayer tooth's socket sand grip (9) and are equipped with inlayer gear (14), operation swing arm (7) correspond middle level tooth's socket sand grip (10) and are equipped with outer gear (15), inlayer gear (14) are located in the inlayer sand grip mounting groove and with inlayer tooth's socket sand grip (9) joggle, outer gear (15) installation with in the middle level sand grip mounting groove and with middle level tooth's socket sand grip (10) joggle, it is rotatory operation swing arm (7) are adjusted inlayer contact nut (4) and middle level contact nut (5) carry out longitudinal movement.

2. A contact area adjustable box threaded electrical connection as claimed in claim 1 wherein: the inner gear (14) and the outer gear (15) are both gears only containing half-cycle teeth, and the teeth on the inner gear (14) and the outer gear (15) are connected with each other.

3. A contact area adjustable box threaded electrical connection as claimed in claim 1 or 2 wherein: the outer walls of the bottoms of the inner layer tooth socket convex strips (9) and the middle layer tooth socket convex strips (10) are respectively provided with a limiting buckle hole (13), the tops of the groove walls of the inner layer convex strip mounting groove and the middle layer convex strip mounting groove are provided with a limiting buckle (12) matched with the limiting buckle holes (13), the groove walls of the inner layer convex strip mounting groove and the middle layer convex strip mounting groove are also provided with a horizontally extending buckle switch (18), the limiting buckle (12) extends in the horizontal direction and is provided with a telescopic rod with a spring inside, the telescopic state switching of the limiting buckle (12) can be triggered by pressing the buckle switch (18), the end part of the limiting buckle (12) facing the limiting buckle hole (13) is an inclined tip, and the limiting buckle (12) can be inserted into the limiting buckle hole (13) when in an extending state;

inlayer gear (14) orientation be equipped with bellied inlayer switch lever (16) on the face of outer gear (15), outer gear (15) dorsad be equipped with bellied skin switch lever (17) on the face of inlayer gear (14), inlayer switch lever (16) and skin switch lever (17) are used for pressing buckle switch (18) are in order to switch spacing buckle (12) telescopic state.

4. A contact area adjustable box threaded electrical connection as claimed in claim 3 wherein: the inner end of the operation rotating rod (7) is inserted into the telescopic nut group, and the end part of the outer end of the operation rotating rod is provided with an adjusting knob (8).

5. An adjustable contact area box threaded electrical connection as in claim 4 wherein: be equipped with card needle (11) that perpendicular level extends outward on the outer wall of outer contact nut (6), adjust knob (8) are car steering wheel's hollow out construction, the back is inwards pressed in operation swing arm (7) card needle (11) can pass adjust knob (8) restriction its rotation.

Technical Field

The invention belongs to the technical field of an electric connection structure of a sleeve of electric equipment of a convertor station, and particularly relates to a threaded electric connection device of a sleeve with an adjustable contact area.

Background

In recent years, many accidents of ignition and combustion of the ultrahigh voltage converter transformer occur, the ignition is rapid, the combustion time is long, the over-fire area is large, serious economic loss is caused to a power grid, and the accidents are found to be directly related to current-carrying failure of a sleeve electric connection structure in post field inspection. Researches show that abnormal phenomena such as overheating and discharge faults can be caused by failure of the sleeve electric connection structure, the high-capacity converter transformer has the characteristics of large load current, high harmonic component, strong mechanical vibration, high operating temperature and the like, and the load current of the high-capacity converter transformer is more than 5000A and is far higher than that of a common power transformer. Failure of the bushing electrical connection is likely to result in a fire or explosion if subjected to such high current carrying conditions.

The screw type electric contact is relatively stable due to a certain pressure when the screw is contacted, thereby causing a problem that the contact area adjustment thereof is relatively troublesome. The prior casing threaded electric connection device is not easy to change the threaded contact area, namely, has no adjusting function. Therefore, the electric connection structure capable of adjusting the thread contact surface is designed, so that the stability of the whole device can be greatly improved.

Disclosure of Invention

The invention aims to overcome the defects that in a sleeve electric connection structure in a converter transformer in the prior art, the contact area of threads of threaded electric contact is not easy to adjust, and the current-carrying failure of the sleeve electric connection structure causes fire.

The invention adopts the following technical scheme:

the utility model provides a casing screw thread electric connection device of adjustable area of contact which the key lies in: the current-carrying connecting structure comprises a current-carrying bottom plate and a connecting terminal, wherein the current-carrying bottom plate is connected with an end plate of the connecting terminal through an external thread connecting screw rod, and a telescopic nut group is sleeved on the connecting screw rod in a threaded manner;

the telescopic nut group comprises an inner layer contact nut, a middle layer contact nut and an outer layer contact nut which are overlapped and telescopic, the bottom of the outer layer contact nut is fixedly connected with the wiring terminal, the outer diameter of the inner layer contact nut is equal to the inner diameter of the middle layer contact nut, and the inner diameter of the middle layer contact nut is equal to the outer diameter of the outer layer contact nut;

the outer wall of the inner layer contact nut is provided with an inner layer tooth groove convex strip, the inner wall of the middle layer contact nut is provided with an inner layer convex strip mounting groove corresponding to the inner layer tooth groove convex strip, the outer wall of the middle layer contact nut is provided with a middle layer tooth groove convex strip, and the outer layer contact nut is provided with a middle layer convex strip mounting groove corresponding to the middle layer tooth groove convex strip;

the utility model discloses a gear rack, including the inlayer tooth's socket, the outer wall of middle level contact nut and outer contact nut is gone up the level and is worn to be equipped with same operation swing arm perpendicularly, the operation swing arm corresponds inlayer tooth's socket sand grip and is equipped with the inlayer gear, the operation swing arm corresponds middle level tooth's socket sand grip and is equipped with outer gear, the inlayer gear is located in the inlayer sand grip mounting groove and with inlayer tooth's socket sand grip joggle, outer gear installation with in the middle level sand grip mounting groove and with middle level tooth's socket sand grip joggle is rotatory the operation swing arm is adjusted inlayer contact nut and middle layer contact nut carry out longitudinal movement.

The effect of this scheme is: the telescopic nut group can be operated to stretch by operating the rotating rod, and the contact area between the telescopic nut group and the external thread connecting screw rod is adjusted to change the current intensity; simple structure, the operation is comparatively convenient, need not to carry out the structure and dismantles and can adjust, and all can adjust before the operation of electricity connection and in the operation.

Preferably, the inner gear and the outer gear are both gears only containing half-cycle teeth, and the teeth on the inner gear and the outer gear are connected with each other. The effect of this scheme is: the inner layer contact nut and the middle layer contact nut in the telescopic nut set can be stretched, the inner layer contact nut which can be operated by the two received half-tooth gears can stretch out to the maximum height, the middle layer contact nut can stretch out, and the two can be guaranteed to stretch out and maintain the continuity.

According to a preferable scheme, the outer walls of the bottoms of the inner-layer tooth groove convex strip and the middle-layer tooth groove convex strip are respectively provided with a limiting buckle hole, the tops of the groove walls of the inner-layer convex strip mounting groove and the middle-layer convex strip mounting groove are provided with a limiting buckle matched with the limiting buckle holes, the groove walls of the inner-layer convex strip mounting groove and the middle-layer convex strip mounting groove are also provided with horizontally extending buckle switches, the limiting buckles are telescopic rods extending in the horizontal direction and internally provided with springs, the telescopic state switching of the limiting buckles can be triggered by pressing the buckle switches, the end parts of the limiting buckles facing the limiting buckle holes are inclined tip ends, and the limiting buckles can be inserted into the limiting buckle holes when in an extending state;

the inner gear faces the face of the outer gear and is provided with a raised inner switch rod, the outer gear faces away from the face of the inner gear and is provided with a raised outer switch rod, and the inner switch rod and the outer switch rod are used for pressing the buckle switch to switch the limit buckle stretching state.

The effect of this scheme is: two switch rods are arranged on the operating rotary rod, when the gear of each stage rotates to the end, the switch rods pass through the buckle switches, and the limiting buckles are inserted into the limiting buckle holes and locked; when the gear rotates to a position just before the gear contacts the tooth seam of the layer of the nut, the switch rod touches the buckle switch to enable the limit buckle to retract, and the layer of the nut can retract under the driving of the gear.

Preferably, the inner end of the operating rotary rod is inserted into the telescopic nut group, and the end part of the outer end of the operating rotary rod is provided with an adjusting knob. The effect of this scheme is: the adjusting knob is convenient to rotate and saves more labor.

According to a preferable scheme, the outer wall of the outer layer contact nut is provided with a clamping needle which extends vertically, horizontally and outwards, the adjusting knob is of a hollow structure in the shape of a vehicle steering wheel, and the clamping needle can penetrate through the adjusting knob to limit the rotation of the adjusting knob after the operating rotary rod is pressed inwards. The effect of this scheme is: when the operation rotary rod is pressed inwards, the clamping pin blocks the adjusting knob to rotate, the whole height is guaranteed not to change, when the operation rotary rod is pulled outwards, the clamping pin fails, and the adjusting knob can be rotated randomly to adjust the contact area.

Has the advantages that: the threaded electric connection device for the sleeve with the adjustable contact area, disclosed by the invention, has the advantages of simple structure and convenience in operation, and the contact area of threaded connection can be adjusted; the structure is not required to be disassembled; can be adjusted before and during operation; the telescopic nut component is a three-layer contact nut, and the proper height can be selected according to the actual situation; the contact nut has a clamping function, so that the device cannot slide and has certain stability.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a simplified structural diagram of the retractable nut assembly of the present invention;

FIG. 3 is a schematic view of the retractable nut assembly of the present invention shown disassembled;

FIG. 4 is a schematic view of the engagement of the inner contact nut 4 with the operating lever 7 according to the present invention;

FIG. 5 is a schematic view of the structure of the operation lever 7 according to the present invention;

FIG. 6 is a position indication of the limit buckle 12 of the present invention in the retractable nut assembly;

FIG. 7 is a position indication of the snap switch 18 of the present invention in the retractable nut assembly;

fig. 8 is a diagram illustrating the engagement between the position-limiting buckle 12 and the position-limiting buckle hole 13 according to the present invention.

Reference signs mean: 1. a current carrying backplane; 2. a wiring terminal; 3. the external thread is connected with the screw rod; 4. an inner layer contact nut; 5. the middle layer contacts the nut; 6. an outer layer contact nut; 7. operating the rotary rod; 8. adjusting a knob; 9. inner layer tooth socket convex strips; 10. a middle layer tooth socket convex strip; 11. clamping a needle; 12. a limiting buckle; 13. limiting the buckling hole; 14. an inner gear; 15. an outer gear; 16. an inner layer switch lever; 17. an outer switch lever; 18. a switch is buckled.

Detailed Description

The invention is described in further detail below with reference to the following figures and examples:

example (b): as shown in the attached drawings 1-8, the casing thread electric connection device with the adjustable contact area comprises a current-carrying bottom plate 1 and a wiring terminal 2, wherein the current-carrying bottom plate 1 is connected with an end plate of the wiring terminal 2 through an external thread connecting screw rod 3, and a telescopic nut group is sleeved on the connecting screw rod 2 in a threaded manner;

the telescopic nut group comprises an inner layer contact nut 4, a middle layer contact nut 5 and an outer layer contact nut 6 which are overlapped and telescopic, the bottom of the outer layer contact nut 6 is fixedly connected with the wiring terminal 2, the outer diameter of the inner layer contact nut 4 is equal to the inner diameter of the middle layer contact nut 5, and the inner diameter of the middle layer contact nut 5 is equal to the outer diameter of the outer layer contact nut 6;

the outer wall of the inner-layer contact nut 4 is provided with an inner-layer tooth groove convex strip 9, the inner wall of the middle-layer contact nut 5 is provided with an inner-layer convex strip mounting groove corresponding to the inner-layer tooth groove convex strip 9, the outer wall of the middle-layer contact nut 5 is provided with a middle-layer tooth groove convex strip 10, and the outer-layer contact nut 6 is provided with a middle-layer convex strip mounting groove corresponding to the middle-layer tooth groove convex strip 10;

same operation swing arm 7 is worn to be equipped with perpendicularly to the level on the outer wall of middle level contact nut 5 and outer contact nut 6, operation swing arm 7 corresponds inlayer tooth's socket sand grip 9 and is equipped with inlayer gear 14, operation swing arm 7 corresponds middle level tooth's socket sand grip 10 and is equipped with outer gear 15, inlayer gear 14 is located in the inlayer sand grip mounting groove and with inlayer tooth's socket sand grip 9 joggle, outer gear 15 installation with in the middle level sand grip mounting groove and with 10 joggles of middle level tooth's socket sand grip, it is rotatory operation swing arm 7 is adjusted inlayer contact nut 4 and middle level contact nut 5 carry out longitudinal movement.

Further, the inner gear 14 and the outer gear 15 are both gears with half-cycle teeth, and the teeth on the inner gear 14 and the outer gear 15 are engaged.

Further, the outer walls of the bottoms of the inner-layer tooth groove convex strips 9 and the middle-layer tooth groove convex strips 10 are respectively provided with a limiting buckle hole 13, the tops of the groove walls of the inner-layer convex strip mounting groove and the middle-layer convex strip mounting groove are provided with a limiting buckle 12 matched with the limiting buckle holes 13, the groove walls of the inner-layer convex strip mounting groove and the middle-layer convex strip mounting groove are also provided with horizontally extending buckle switches 18, the limiting buckles 12 are telescopic rods extending in the horizontal direction and internally provided with springs, the telescopic state switching of the limiting buckles 12 can be triggered by pressing the buckle switches 18, the end parts of the limiting buckles 12 facing the limiting buckle holes 13 are inclined tip ends, and the limiting buckles 12 can be inserted into the limiting buckle holes 13 when in the extending state;

a convex inner-layer switch rod 16 is arranged on the surface of the inner-layer gear 14 facing the outer-layer gear 15, a convex outer-layer switch rod 17 is arranged on the surface of the outer-layer gear 15 facing away from the inner-layer gear 14, and the inner-layer switch rod 16 and the outer-layer switch rod 17 are used for pressing the buckle switch 18 to switch the telescopic state of the limit buckle 12, wherein the internal connection between the buckle switch and the buckle can be realized in various modes, and the traditional trigger switch mode is adopted, and the invention is not explicitly described.

Furthermore, the inner end of the operation rotary rod 7 is inserted into the telescopic nut group, and the end part of the outer end is provided with an adjusting knob 8.

Further, be equipped with perpendicular level outside card needle 11 that extends on the outer wall of skin contact nut 6, adjust knob 8 is the discoid hollow out construction of car direction, the back is inwards pressed to operation swing arm 7 card needle 11 can pass adjust knob 8 restriction its rotation.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.