Self-centering high-capacity contact finger for GIL

Abstract

The invention relates to the technical field of high-voltage electrical equipment, in particular to a self-centering high-capacity contact finger for a GIL. The connector comprises a male head and a female head, the male head and the female head are in plugging cooperation, one side in the female head is provided with a root groove, the root groove is internally provided with a contact finger body, the contact finger body is of an annular structure, and the inner surface of the root groove is provided with a plurality of groups of elastic pins surrounding the axis of the root groove in an annular array; the contact finger body is fixed among the plurality of groups of elastic pins; the elastic pin is used for providing axial supporting force for the contact finger body, so that the contact finger body is concentric with the female head in an initial state. The contact finger body is supported by the elastic pins and has high stability, it is guaranteed that in the initial state, the circle center axis of the contact finger body and the circle center axis of the female head are collinear, at the moment, the contact finger body does not interfere with an inserted male head, the contact finger piece rotates with the supporting ring as the axis, and small-angle compensation is achieved; therefore, the contact finger adaptability of the contact is improved, and the contact is particularly used in a long line.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electrical equipment, in particular to a self-centering large-capacity contact finger for GIL. Background Art

[0002] The existing GIL contact fingers are mainly evolved from GIS, and the main forms are spring contact fingers, strap contact fingers, plum blossom contact fingers, etc. The main form of spring contact fingers is in the shape of a spring, installed in the inner groove of the contact seat, and through the compression of the spring itself, the surface of the conductor is closely fitted with the surface of the spring contact finger, so as to achieve the purpose of conduction. The strap contact finger has a structure similar to a strap, and the principle is similar to that of the spring contact finger. The plum blossom contact finger is similar to bundling some contact finger pieces together through the spring contact finger, and is often used in the GIS arc extinguishing chamber.

[0003] At present, in order to realize the free movement of the contact finger following the contact head within a certain angle range, the contact finger is usually composed of a contact finger piece and a limit ring, and the two are connected by a spring, see Figure 8 As shown, the radial forces F1 and F2 generated by the compression spring enable the contact finger to be fixed in the contact mounting groove, and a gap needs to be left between the contact finger and the inner wall of the mounting groove ( Figure 8 The shaded part in the figure) enables the stylus to move in the axial direction.

[0004] However, in actual use, it was found that due to the existence of the gap, the stability of the contact fingers was poor, so that the contacts might be offset before they were docked. At this time, it was difficult for the contacts to be docked or plugged smoothly, and they were also prone to hard contact with the contact fingers, causing damage to the contact surface. Summary of the invention

[0005] The object of the present invention is to provide a self-centering large-capacity contact finger for GIL, so as to solve the problem that the gap cannot form effective support for the contact finger, resulting in poor stability of the contact finger.

[0006] To achieve the above-mentioned purpose, the present invention provides a self-centering large-capacity contact finger for GIL, which includes a male head and a female head, the male head and the female head are plugged together, a root groove is arranged on one side of the female head, a contact finger body is arranged in the root groove, the contact finger body is an annular structure, and a plurality of groups of elastic feet are arranged on the inner surface of the root groove in an annular array around its axis; the contact finger body is fixed between the plurality of groups of elastic feet, and the elastic feet are used to provide axial support force to the contact finger body, so that the contact finger body is concentric with the female head in an initial state.

[0007] As a further improvement of the technical solution, the outer surface of the male head is silver-plated, and the inner surface of the root groove is silver-plated.

[0008] As a further improvement of the technical solution, a retaining spring groove is provided on the outer side of the root groove, a retaining spring is arranged in the retaining spring groove, and a pressure ring is arranged between the retaining spring and the contact finger body to squeeze the contact finger body.

[0009] As a further improvement of the technical solution, a plurality of groups of the elastic feet are arranged at equal intervals.

[0010] As a further improvement of the technical solution, the contact finger body includes a bracket and a contact finger piece, and the bracket is arranged outside the contact finger piece in a half-wrapped form, and the contact finger piece is exposed to the inner side of the female head; The support is a ring structure; The bracket and the contact finger sheet are respectively provided with a bracket connection groove and a contact finger sheet connection groove on the side facing each other; It also includes a finger contact spring, wherein the finger contact spring is connected to the bracket through a bracket connecting groove, and is connected to the finger contact piece through a finger contact piece connecting groove; It also includes a supporting ring, which is used to string together a plurality of contact finger pieces to form a whole, and the finger pieces deflect with the supporting ring as the axial center.

[0011] As a further improvement of the technical solution, a first groove is formed on a side of the bracket away from the contact finger piece, and a second groove is formed on a side of the contact finger piece away from the contact finger spring; A first protrusion is provided on one side of the pressure ring, the first protrusion is engaged with the first groove, and the first groove and the first protrusion are clearance-matched; A second protrusion is arranged on the inner wall of the root groove, the second protrusion is engaged with the second groove, and the second groove and the second protrusion are clearance-matched.

[0012] As a further improvement of the technical solution, the outer surface of the bracket is parallel to the inner surface of the root groove, and each group of elastic feet between the two is composed of two elastic feet, and the two elastic feet in each group are symmetrically arranged.

[0013] As a further improvement of the technical solution, the compensation angle obtained when the contact finger piece deflects around the support ring is D; When the compensation angle requirement of the male head is greater than D, the first lower arc surface of the first groove fits with the first protrusion, and the second upper arc surface of the second groove fits with the second protrusion; Alternatively, the first upper arc surface of the first groove fits with the first protrusion, and the second lower arc surface of the second groove fits with the second protrusion; Both of the above methods cause the bracket to drive the contact finger to deflect, and the compensation angle increases from D to E; The central axis of the support ring produces a deflection angle F; We get: ED=F.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the self-centering large-capacity contact finger for GIL, the contact finger body has two states. In the first state, the contact finger body is supported by the elastic foot, which has high stability, ensuring that in the initial state, the center axis of the contact finger body is in line with the center axis of the female head. At this time, the contact finger body will not interfere with the inserted male head, and the contact finger piece rotates with the support ring as the axis to achieve small angle compensation, thereby improving the adaptability of the contact finger, especially when used in long lines; In the second state, the force exerted on the contact finger body by the male head is greater than the supporting force generated by the elastic foot. At this time, the bracket can drive the contact finger to move freely, realize large-angle compensation, and further improve the adaptability of the contact finger.

[0015] 2. In the self-centering large-capacity contact finger of the GIL, the clearance between the groove and the protrusion makes the entire contact finger body move more flexibly in the root groove, and the angle at which the bracket can deflect is also increased. Moreover, under the joint action of the contact finger spring and the elastic foot, the groove and the protrusion have a strong effect in the axial and radial directions, so that they can fit tightly and be stably connected together. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A magnified view of the structure at position I; Figure 3 It is an exploded view of the overall structure of the present invention; Figure 4 It is a schematic diagram of the structure of the stylus body of the present invention; Figure 5 This is a schematic diagram of the working principle of the stylus body of the present invention; Figure 6 This is the second schematic diagram of the working principle of the stylus body of the present invention; Figure 7 It is a schematic diagram of the male and female structures of the present invention; Figure 8 It is a schematic diagram of the structure of the touch finger in the prior art; Fig. 9 It is a schematic diagram of the boundary structure of the touch finger sheet in the prior art; Fig.10 It is a schematic diagram of the structure of the contact finger piece and the support ring of the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Definitions of abbreviations and key terms include: GIL: Rigid gas-insulated transmission line; GIS: Gas-insulated metal-enclosed switchgear; Contacts: Male and female contacts in the GIL conductor connection process; Contact finger: The contact finger piece at the female end that contacts the male end and conducts electricity during the GIL connection process; Capacity: The current that the product draws when it is powered on.

[0019] At present, there is a method of realizing angle compensation in the process of contact docking through the free movement of the contact finger. In Chinese Patent Publication No. CN113839242A, a contact finger for high-voltage electrical equipment is disclosed, and it is specifically disclosed that all the contact finger pieces are connected together through a positioning ring, so that synchronous radial compensation can be performed, so that the concentricity of all the contact finger pieces is relatively high. A spring is sleeved on the contact finger shaft of each contact finger piece, and the spring is always in a compressed state through the extrusion of the block and the retaining ring, so that the contact finger piece maintains close contact with the female contact and the male contact. There is an angle between the side edges of the contact finger piece that abut against the male contact, the female contact, and the limit ring and the contact surface, so that the contact finger piece can realize the radial compensation function.

[0020] like Fig. 9 As shown, under normal circumstances, the boundary of the contact finger (solid line) is directly opposite to the chamfer of the male contact, so the male contact and the female contact will be very smooth during the plug-in process under the guidance of the chamfer. However, if the contact finger is offset before plug-in, the boundary of the contact finger (dashed line) will also be offset relative to the chamfer of the male contact (that is, the contact finger and the female contact cannot be concentric). At this time, when the male contact is inserted into the female contact along the original insertion direction, the chamfer will make hard contact with the boundary of the contact finger (dashed line), causing jamming and even damage to the surface of the male contact.

[0021] This embodiment provides a self-centering large-capacity contact finger for GIL that can effectively support the contact finger in the axial direction, and its purpose is to solve the above-mentioned problem.

[0022] See also Figure 1 and Figure 7As shown, the contact finger includes a male plug 100, a female plug 200 and a contact finger body 300. The specific assembly relationship is as follows: the male plug 100 and the female plug 200 are respectively welded to other conductors, and the outer surface of the head of the male plug 100 is silver-plated, and the inner surface of the root groove 220 on one side of the inner side of the female plug 200 is also silver-plated. The silver plating is done because silver is one of the metals with the best conductivity, thereby reducing the resistance of the contact surface. Therefore, the current transmission process is completed through the contact between the silver-plated surfaces of the male plug 100 and the female plug 200 and the contact finger body 300, which can improve the efficiency of current passing and ensure good electrical connection.

[0023] The finger body 300 is installed in the root groove 220. The finger body 300 is a ring structure. Figure 2 and Figure 3 As shown, a spring groove 221 is provided on the outer side of the root groove 220. During installation, the contact body 300 is squeezed by the pressing ring 500, and then the spring 400 is installed in the spring groove 221. At this time, the entire female connector 200 is assembled.

[0024] It should be emphasized that if Figure 3 As shown, in order to form an axial support for the contact finger body 300, a plurality of sets of elastic feet 230 are arranged in a circular array around the axis on the inner surface of the root groove 220. During assembly, the annular contact finger body 300 is fixed between the plurality of sets of elastic feet 230, and then the pressure ring 500 and the retaining spring 400 are installed in sequence.

[0025] The plurality of groups of elastic feet 230 are arranged at equal intervals, and the more groups are arranged, the stronger the support capability for the contact finger body 300 is.

[0026] Next, the structure of the stylus body 300 is disclosed. Figure 2 As shown, the contact finger body 300 includes a bracket 310, a contact finger sheet 320, a contact finger spring 330 and a support ring 340. Figure 4 As shown, the bracket 310 is an annular structure, and its cross-sectional shape is similar to a flat "L"-shaped structure, thereby obtaining a horizontal section 311 and a vertical section 312. The bracket 310 is arranged outside the contact finger sheet 320 in a half-wrapped form, and the contact finger sheet 320 is exposed to the inner side of the female connector 200 (such as Figure 3 As shown, with the axis side as the inner side), a bracket connecting groove 3121 and a contact finger connecting groove 3221 are respectively opened on the side facing each other of the vertical section 312 and the contact finger piece 320, and then, the contact finger spring 330 is connected to the bracket 310 through the bracket connecting groove 3121, and is connected to the contact finger piece 320 through the contact finger piece connecting groove 3221.

[0027] In addition, if Fig.10As shown, the support ring 340 with an opening is passed through the small hole on the contact finger piece 320, and a plurality of contact finger pieces 320 are strung together to form a whole. The whole structure is assembled with the bracket 310, specifically: the whole with one side of the contact finger spring 330 is placed into the bracket connecting groove 3121, and they are connected together by electrical insulating glue and cured. At this time, the assembly process of the contact finger body 300 is completed. The finger piece connecting groove 3221 and the bracket connecting groove 3121 are dedicated spring installation grooves, which can improve the installation efficiency of the contact finger spring 330 and play a positioning role to prevent the contact finger spring 330 from being misplaced. The use of electrical insulating glue during the assembly process can ensure that the contact finger spring 330 and the bracket 310 are firmly installed, and at the same time prevent the generation of impurities such as metal chips during use.

[0028] When using, see Figure 1-3 As shown, the finger body 300 is installed into the root groove 220, and pressure is applied to one side of the bracket 310 of the finger body 300 through the pressure ring 500 and the special tooling, as shown in FIG. Figure 5 As shown, under the action of pressure, the contact body 300 is tightly fitted with the silver-plated surfaces of the male connector 100 and the female connector 200. At the same time, because the contact piece 320 has a certain angle, the contact piece 320 is deflected with the support ring 340 as the axial center, so that the conductive surface of the contact piece 320 in contact with the silver-plated surface of the male connector 100 is more biased towards the center, achieving a closer contact. In addition, the support ring 304 and the support ring 340 play the role of support and lever fulcrum, which can prevent the contact spring 330 from becoming unstable.

[0029] For details, see Figure 5 As shown, the surface of the contact finger piece 320 contacting the male connector 100 is the first conductive surface 323 , and the surface of the contact finger piece 320 contacting the female connector 200 is the second conductive surface 324 .

[0030] in: The angle between the outer surface of the contact finger 320 and the cross section 311 is C, and the first conductive surface 323 is arranged in a "V" shape. The angle between one side surface and the male plug 100 entering along the insertion direction is B, and the angle between the other side surface of the first conductive surface 323 and the male plug 100 entering along the insertion direction is A. Due to the design of the angle, GIL products usually have a long line layout, complex working conditions, large foundation settlement and various stress loads, so the radial displacement of the line is large. At the same time, due to the long line, the axial displacement is also large. The contact finger 320 can move freely without radial displacement restrictions. It can be tightly concentric with the male plug 100 according to the center of the female plug 200, thereby avoiding mechanical damage to the male plug 100 and the female plug 200 caused by non-concentricity, absorbing radial displacement, and avoiding damage during axial movement, thereby improving the service life, usually up to 30,000 plug-in wear during the mechanical life.

[0031] Under the joint action of the finger spring 330 and the elastic foot 230, the expansion force generated by the contact between the male connector 100 and the finger sheet 320 and the compression force between the elastic component (i.e., the finger spring 330 and the elastic foot 230) and the female connector 200 interact to reach a balance point, and the first conductive surface 323 and the second conductive surface 324 are subjected to balanced forces, thereby achieving close contact, realizing surface contact, increasing the flow area and improving the flow capacity.

[0032] In addition, the elastic structure (ie, the contact spring 330 ) used in the contact body 300 may also be a spring sheet. When the contact spring 330 is replaced with other structures, the structure of the bracket 310 will be adjusted, and electrical insulating glue is not necessarily used.

[0033] In addition, the head of the male connector 100 is provided with a chamfered surface 110. Based on the guidance of the chamfered surface 110, the contact between the male connector 100 and the internal structure of the female connector 200 is smoother, and a conical surface 210 is provided inside the female connector 200. When the male connector 100 and the female connector 200 are assembled, the product will produce an angular deflection of the axial position due to its own force during actual operation. After the deflection occurs, the setting of the conical surface 210 prevents the male connector 100 from interfering with the inner wall of the female connector 200.

[0034] Further, such as Figure 4 As shown, a first groove 313 is provided on a side of the vertical section 312 of the bracket 310 away from the contact finger piece 320, a second groove 322 is provided on a side of the contact finger piece 320 away from the contact finger spring 330, a first protrusion 510 on one side of the pressing ring 500 is engaged with the first groove 313 (the first groove 313 is slightly larger than the first protrusion 510), a second protrusion 222 arranged on the inner wall of the root groove 220 is engaged with the second groove 322 (the second groove 322 is slightly larger than the second protrusion 222), and with the support of the elastic foot 230, the contact finger body 300 is limited, ensuring that the contact finger body 300 can be concentric with the female head 200 in the initial state, that is, the central axes of the two are collinear.

[0035] Among them, Figure 4 As shown, the outer surface of the cross section 311 of the bracket 310 is parallel to the inner surface of the root groove 220, and each group of elastic legs 230 between the two consists of two elastic legs 230, and the two elastic legs 230 of each group are symmetrically arranged.

[0036] like Figure 5 As shown, in general, the angle that can be compensated by the deflection of the contact finger piece 320 around the support ring 340 is D. The angle compensation allows the male connector 100 to be smoothly inserted into the female connector 200, and the small angle of settlement can be compensated by the deflection of the contact finger piece 320. However, when the angle of settlement is large, that is, the angle of deflection of the male connector 100 has exceeded D, see Figure 6Because the first groove 313 and the first protrusion 510 are in clearance fit, and the second groove 322 and the second protrusion 222 are in clearance fit, the bracket 310 can move freely. However, under the support of the elastic foot 230, the bracket 310 is in a stable state. When the force exerted by the male head 100 on the bracket 310 is greater than the supporting force of the elastic foot 230, the bracket 310 will drive the contact finger piece 320 and the support ring 340 to deflect synchronously, so that the first lower arc surface 3132 of the first groove 313 and the first The protrusion 510 is fitted, and the second upper arc surface 3221 of the second groove 322 is fitted with the second protrusion 222. Finally, the contact finger piece 320 and the support ring 340 are deflected, so that the compensation angle increases from D to E. At the same time, the central axis of the support ring 340 also produces a deflection of the angle F, that is, the male head 100 is actually connected to the annular contact finger body 300. Through the deflection of the bracket 310, the support ring 340 drives the entire annular contact finger piece 320 and the male head 100 to deflect synchronously, and an angle relationship of ED=F is obtained.

[0037] It should be noted that there is also a situation where the first upper arc surface 3131 of the first groove 313 fits with the first protrusion 510 , and the second lower arc surface 3222 of the second groove 322 fits with the second protrusion 222 .

[0038] It should be emphasized here that the contact fingers can be freely designed according to the voltage level of the product. Since the flow cross section of the contact finger piece 320 is increased, the flow requirements of each voltage level 3150A-8000A can be met. The flow capacity can be adjusted by increasing or decreasing the number of contact finger pieces 320 according to the conductor diameter size requirements. It has the characteristics of compact structure and small space requirements. At the same time, with the increase or decrease of the conductor diameter, the linear increase of the flow can be achieved.

[0039] The strict working condition requirements of GIL products are met, because GIL products usually have long line layouts, complex working conditions, large foundation settlement and various stress loads, so the radial displacement is large, and the displacement caused by the long axial direction of the line is also large. Usually, an angular deflection occurs during the docking process of the male connector 100 and the female connector 200. Compared with the traditional contact finger, the above scheme can provide an angular deflection of ±2.5° due to the rotatable feature of the contact finger piece 320, which can absorb the error caused by the installation process, and can provide an angular deflection of ±1.0° through the deflection of the bracket 310. Then, plus the ±2.5° rotation of the contact finger piece 320, a ±3.5° angular deflection is obtained, which can absorb the error caused by foundation settlement and various stress loads.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-centering large-capacity contact finger for GIL, comprising a male head (100) and a female head (200), wherein the male head (100) and the female head (200) are plugged together, a root groove (220) is provided on one side of the female head (200), a contact finger body (300) is provided in the root groove (220), and the contact finger body (300) is an annular structure, characterized in that: On the inner surface of the root groove (220), a plurality of groups of elastic feet (230) are arranged in a circular array around the axis thereof; The contact finger body (300) is fixed between a plurality of sets of elastic legs (230); The elastic foot (230) is used to provide an axial support force to the contact finger body (300), so that the contact finger body (300) is concentric with the female head (200) in an initial state.

2. The self-centering large-capacity contact finger for GIL according to claim 1, characterized in that: The outer surface of the head of the male connector (100) is silver-plated, and the inner surface of the root groove (220) is silver-plated.

3. The self-centering large-capacity contact finger for GIL according to claim 1, characterized in that: A retaining spring groove (221) is provided on the outer side of the root groove (220), a retaining spring (400) is arranged in the retaining spring groove (221), and a pressure ring (500) is arranged between the retaining spring (400) and the contact finger body (300) to press the contact finger body (300).

4. The self-centering large-capacity contact finger for GIL according to claim 1, characterized in that: The plurality of groups of elastic feet (230) are arranged at equal intervals.

5. The self-centering large-capacity contact finger for GIL according to any one of claims 1 to 4, characterized in that: The contact finger body (300) comprises a bracket (310) and a contact finger sheet (320); the bracket (310) is arranged outside the contact finger sheet (320) in a half-wrapped form, and the contact finger sheet (320) is exposed to the inner side of the female head (200); The support (310) is a ring-shaped structure; The bracket (310) and the contact finger sheet (320) are respectively provided with a bracket connection groove (3121) and a contact finger sheet connection groove (3221) on the sides facing each other; It also comprises a finger contact spring (330), wherein the finger contact spring (330) is connected to the bracket (310) via a bracket connection groove (3121), and is connected to the finger contact sheet (320) via a finger contact sheet connection groove (3221); It also comprises a support ring (340), wherein the support ring (340) is used to string together a plurality of contact finger pieces (320) to form a whole, and the contact finger pieces (320) are deflected with the support ring (340) as the axial center.

6. The self-centering large-capacity contact finger for GIL according to claim 5, characterized in that: A first groove (313) is provided on a side of the bracket (310) away from the contact finger sheet (320), and a second groove (322) is provided on a side of the contact finger sheet (320) away from the contact finger spring (330); A first protrusion (510) is provided on one side of the pressure ring (500), the first protrusion (510) is engaged with the first groove (313), and the first groove (313) and the first protrusion (510) are clearance-matched; A second protrusion (222) is provided on the inner wall of the root groove (220), the second protrusion (222) is engaged with the second groove (322), and the second groove (322) and the second protrusion (222) are clearance-matched.

7. The self-centering large-capacity contact finger for GIL according to claim 5, characterized in that: The outer surface of the bracket (310) is parallel to the inner surface of the root groove (220), and each group of elastic feet (230) between the two is composed of two elastic feet (230), and the two elastic feet (230) in each group are symmetrically arranged.

8. The self-centering large-capacity contact finger for GIL according to claim 6, characterized in that: The compensation angle obtained when the contact finger piece (320) deflects around the support ring (340) is D; When the compensation angle requirement of the male head (100) is greater than D, the first lower arc surface (3132) of the first groove (313) fits with the first protrusion (510), and the second upper arc surface (3221) of the second groove (322) fits with the second protrusion (222); Alternatively, the first upper arc surface (3131) of the first groove (313) fits with the first protrusion (510), and the second lower arc surface (3222) of the second groove (322) fits with the second protrusion (222); Both of the above methods cause the bracket (310) to drive the contact finger piece (320) to deflect, and the compensation angle increases from D to E; The central axis of the support ring (340) generates a deflection angle F; We get: ED=F.

Images