CN217444323U

CN217444323U - Moving arc contact of SF6 circuit breaker

Info

Publication number: CN217444323U
Application number: CN202122993185.9U
Authority: CN
Inventors: 杨文成; 陈国静; 曹少华; 张立文; 智慧
Original assignee: Shandong Taikai High Volt Switchgear Co Ltd
Current assignee: Shandong Taikai High Volt Switchgear Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-09-16
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a moving arc contact of SF6 circuit breaker belongs to circuit breaker spare part technical field, and the scheme of adoption is: including the contact main part of cylinder, the one end of contact main part is provided with a plurality of fingers of touching, and a plurality of circumference evenly distributed along the contact main part that touch is provided with interior protective sheath on the inner wall of contact main part, the external diameter of interior protective sheath with the internal diameter of contact main part suits, and the one end of interior protective sheath contacts with touching the finger, keeps away from on the other end and the contact main part and touches the terminal surface looks parallel and level that indicates one end, is close to in the contact main part to touch the one end periphery that indicates and overlaps and is equipped with outer water conservancy diversion cover, keeps away from in the contact main part and still is provided with the annular on the outer wall of the one end that touches the finger, and the annular is located outer water conservancy diversion cover and keeps away from the tip that touches the finger. The device can strengthen the current breaking capacity of the circuit breaker when the circuit breaker is opened and closed, improve the arc ablation resistance of the moving arc contact, and ensure the service life and long-term operation performance of the device.

Description

Moving arc contact of SF6 circuit breaker

Technical Field

The patent relates to the technical field of circuit breaker parts, in particular to a moving arc contact of an SF6 circuit breaker.

Background

The SF6 gas insulated switchgear is characterized in that components such as a circuit breaker, a disconnecting switch and a grounding switch are combined and sealed in a grounded technical shell, and compared with the air insulated switchgear, the SF6 gas insulated switchgear has the advantages of good performance, small occupied area, strong environment adaptability, small operation and maintenance amount and the like, so that the SF6 gas insulated switchgear is developed vigorously since being produced; the circuit breaker has the functions of cutting off the grounding short circuit fault current of the power grid and protecting the stable operation of the power grid, and various grounding fault currents can be cut off at any time when the circuit breaker is in actual use.

The moving arc contact of the circuit breaker at the present stage still has the following defects and shortcomings:

1. the arranged auxiliary nozzle is made of polytetrafluoroethylene, so that the insulating capability is reduced after burning loss in the fault current breaking process, and nozzle insulation breakdown is easy to occur;

2. when the circuit breaker is switched on and off, the hot air flow easily heats the contact finger part of the moving arc contact and then reduces the contraction force, so that the contact resistance of the moving arc contact and the static arc contact is increased, and the switching-on and switching-off performance of the circuit breaker is influenced;

3. in the earlier stage of opening the circuit breaker, compressed gas is lost between the arc contact pieces, and the gas pressure in the cylinder is reduced to influence the on-off performance of the circuit breaker.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned moving arc contact compressed gas loss and take place the not enough of spout puncture easily, the utility model provides a moving arc contact of SF6 circuit breaker.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: the utility model provides a moving arc contact of SF6 circuit breaker, includes the contact main part of cylinder, and the one end of contact main part is provided with a plurality of fingers of touching, and a plurality of fingers are provided with interior protective sheath along the circumference evenly distributed of contact main part on the inner wall of contact main part, the external diameter of interior protective sheath with the internal diameter of contact main part suits, and the one end of interior protective sheath contacts with touching the finger, keeps away from on the other end and the contact main part to touch the terminal surface looks parallel and level that indicates one end, is close to touch to be equipped with outer water conservancy diversion cover in the one end periphery that indicates in the contact main part, still is provided with the annular on the outer wall of keeping away from the one end that indicates in the contact main part, and the annular is located outer water conservancy diversion cover and keeps away from the tip that touches the finger. The movable arc contact is installed in an arc extinguishing chamber of the circuit breaker after being assembled, and before opening, the inner protective sleeve can seal a gap between adjacent contact fingers, so that the loss of high-pressure gas can be effectively avoided, and the gas pressure in a cylinder is improved; when the brake is switched off, the outer guide sleeve can guide high-pressure airflow in the cylinder to blow out electric arcs, and can prevent breakdown phenomena from occurring while guiding the high-pressure airflow, so that the insulation performance of the circuit breaker is prevented from being reduced; the inner protective sleeve can prevent the contact fingers from directly contacting with hot air flow, and prevent the contact resistance of the stop and static arc contacts from increasing.

Furthermore, the contact main body is in a split type arrangement and comprises a first contact main body and a second contact main body, the first contact main body is fixedly connected with the contact finger, the annular groove is formed in the second contact main body, and the contact surfaces of the first contact main body and the second contact main body are matched with each other. Adopt split type design can only change the damage position when needing to be changed, the resources are saved of being convenient for, the while is convenient for install and remove, can prevent to dismantle the whole structure repeatedly, has greatly shortened maintenance duration.

Furthermore, a backing ring is arranged between the first contact finger main body and the outer flow guide sleeve, one end of the backing ring is flush with one end of the first contact finger main body close to the second contact finger main body, and the other end of the backing ring is flush with one end of the outer flow guide sleeve close to the contact finger. The reliability of the device can be enhanced, and the vibration of the outer flow guide sleeve during switching-on and switching-off can be prevented.

Furthermore, the outer guide sleeve comprises a large-diameter section and a small-diameter section, the large-diameter section is located on one side close to the ring groove, a threaded through hole is formed in the large-diameter section, a corresponding threaded hole is formed in the second contact body, and a screw penetrates through the threaded through hole and the threaded hole to lock and fix the outer guide sleeve and the second contact body. The screw is adopted to fix and ensure the connection strength, and meanwhile, the disassembly and the assembly are convenient, the thickness of the joint of the outer flow guide sleeve is increased, the strength of the outer flow guide sleeve can be enhanced, and the reliability of the device is improved.

Furthermore, the contact finger is an elastic contact piece, one end of the contact finger is provided with a contact convex block, and the other end of the contact finger extends into the inner cavity of the contact main body and is in joggle joint with the contact main body. The positioning and installation of the contact finger are facilitated, the contact finger extends into the inner cavity of the contact main body, so that the inner protective sleeve is positioned on the inner side of the contact finger, and the protective effect of the inner protective sleeve on the contact finger can be enhanced; when the circuit breaker is switched on and off, certain elastic force can be provided, and reliable contact of the movable arc contact and the static arc contact is ensured.

Further, the contact main body is provided with a mounting groove at one end far away from the contact finger, the end part of the inner protective sleeve is provided with an annular convex block, and the mounting groove is matched with the section shape of the annular convex block. The positioning and the installation of the inner protective sleeve are convenient.

Furthermore, the contact main body, the contact finger, the inner protective sleeve and the outer flow guide sleeve are all made of copper-containing high-temperature-resistant metal materials. The outer guide sleeve and the inner protective sleeve are guaranteed to be high temperature resistant, the insulation performance of the circuit breaker cannot be reduced, and breakdown is prevented.

According to the technical scheme, the utility model has the advantages of it is following:

this scheme provides a movable arc contact of SF6 circuit breaker, and the device can be when the circuit breaker divides, closes a floodgate through adopting the movable arc contact in this application, reinforcing circuit breaker break-make current ability, promotes the movable arc contact and tolerates electric arc ablation ability, can make circuit breaker break-make current reach 63kA, 20 times, when having guaranteed the life and the long-term service performance of device, satisfy its electrical requirement and mechanical requirement to far exceed the requirement value of national and international standard.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a sectional view of fig. 1.

In the figure, 1, a contact body, 2, a first contact body, 3, a second contact body, 4, a contact finger, 5, a contact lug, 6, a ring groove, 7, an inner protective sleeve, 8, an outer guide sleeve, 9, a large-diameter section, 10, a small-diameter section, 11, a backing ring, 12, a threaded through hole, 13, a threaded hole, 14, a screw, 15, a mounting groove, 16 and an annular lug.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

As shown in fig. 1 to 2, a moving arc contact of SF6 circuit breaker, including cylindrical contact main body 1, the one end of contact main body 1 is provided with a plurality of contact fingers 4, a plurality of contact fingers 4 are along the circumference evenly distributed of contact main body 1, be provided with inner protective sheath 7 on the inner wall of contact main body 1, the external diameter of inner protective sheath 7 suits with the internal diameter of contact main body 1, the one end of inner protective sheath 7 contacts with contact finger 4, the terminal surface that keeps away from contact finger 4 one end on the other end and the contact main body 1 is the parallel and level mutually, the cover is equipped with outer water conservancy diversion cover 8 on the contact main body 1 near the one end periphery of contact finger 4, still be provided with annular groove 6 on the outer wall of the one end of keeping away from contact finger 4 on contact main body 1, annular groove 6 is located outer water conservancy diversion cover 8 and keeps away from the tip of contact finger 4.

The contact body 1, the contact finger 4, the inner protective sleeve 7 and the outer flow guide sleeve 8 are all made of copper-containing high-temperature-resistant metal materials. Specifically, the contact body 1 of the moving arc contact can be made of chromium copper, and the contact finger 4 at the front end is made of copper-tungsten alloy; the main part of the outer diversion sleeve 8 is made of chromium-copper materials, and the part of the front end close to the contact finger 4 is made of copper-tungsten alloy materials; the main body part of the inner protective sleeve 7 is made of chromium-copper materials, and the part of the front end, which is in contact with the contact finger 4, is made of copper-tungsten alloy materials. The outer guide sleeve 8 and the inner protective sleeve 7 are guaranteed to be high-temperature resistant, the insulation performance of the circuit breaker cannot be reduced, and breakdown is prevented.

In this embodiment, the specific structure of the contact body 1 is: contact main part 1 is split type setting, including contact main part one 2 and contact main part two 3, contact main part one 2 with touch 4 fixed connection, annular 6 sets up on contact main part two 3, contact main part one 2 mutually supports with contact main part two 3's contact surface. In the embodiment, the contact surface of the contact main body I2 and the contact main body II 3 is an inclined surface; adopt split type design can only change the damage position when needing to be changed, the resources are saved of being convenient for, the while is convenient for install and remove, can prevent to dismantle whole structure repeatedly, has greatly shortened maintenance duration.

In the embodiment, the contact finger 4 is an elastic contact piece, one end of the contact finger 4 is provided with a contact bump 5, and the other end of the contact finger 4 extends into the inner cavity of the contact main body 1 and is joggled with the contact main body 1. The positioning and installation of the contact finger 4 are facilitated, the contact finger 4 extends into the inner cavity of the contact main body 1, so that the inner protective sleeve 7 is positioned on the inner side of the contact finger 4, and the protective effect of the inner protective sleeve 7 on the contact finger 4 can be enhanced; the circuit breaker can provide certain elasticity when opening and closing, and the reliable contact of the movable arc contact and the static arc contact is ensured.

In this embodiment, the specific structure of the outer flow guiding sleeve 8 is as follows: the outer guide sleeve 8 comprises a large-diameter section 9 and a small-diameter section 10, the large-diameter section 9 is located on one side close to the annular groove 6, a threaded through hole 12 is formed in the large-diameter section 9, a corresponding threaded hole 13 is formed in the second contact body 3, and a screw 14 penetrates through the threaded through hole 12 and the threaded hole 13 to lock and fix the outer guide sleeve 8 and the second contact body 3. Adopt 14 fixed screws, can select for use countersunk screw, be convenient for the dismouting when guaranteeing joint strength, can strengthen the intensity of outer water conservancy diversion cover 8 with the thickness increase of 8 junctions of outer water conservancy diversion cover, improve the reliability of device.

The outer wall of the contact main body I2 is further provided with a backing ring 11, the backing ring 11 is located between the contact main body I2 and the outer flow guide sleeve 8, the length of the backing ring 11 is larger than that of the contact main body I2, and one end of the backing ring 11 is flush with one end, close to the contact finger 4, of the outer flow guide sleeve 8. The reliability of the device can be enhanced, and the vibration of the outer flow guide sleeve 8 during switching-on and switching-off can be prevented.

In addition, a mounting groove 15 is arranged at one end of the contact main body 1 far away from the contact finger 4, an annular convex block 16 is arranged at the end part of the inner protective sleeve 7, and the mounting groove 15 is matched with the cross section shape of the annular convex block 16. The inner protective sleeve 7 can be arranged in a split mode, and the inner protective sleeve 7 can be arranged to be connected with the contact finger 4 and the contact main body 1 respectively.

The working principle of the moving arc contact of the SF6 circuit breaker is as follows: when the moving arc contact is assembled, a plurality of contact fingers 4 are joggled at one end of a contact main body I2, after a backing ring 11 is sleeved on the outer wall of the contact main body I2, the contact main body I2 and a contact main body II 3 are matched and fixedly connected with an outer flow guide sleeve 8, and are fixed by screws 14; then, the inner protective sleeve 7 is arranged in the inner cavity of the contact main body 1, so that the annular convex block 16 at the end part of the inner protective sleeve 7 is matched with the installation groove 15 on the contact main body 1; after the moving arc contact is assembled, the moving arc contact is installed in an arc extinguishing chamber of a circuit breaker, before opening, the contact fingers 4 provide certain elastic force to enable the moving arc contact and the static arc contact to be reliably contacted, and the inner protective sleeve 7 can seal the gap between the adjacent contact fingers 4, so that the loss of high-pressure gas can be effectively avoided, and the gas pressure in a cylinder is improved; when the switch is switched off, the movable arc head and the static arc head are disconnected, the outer guide sleeve 8 guides high-pressure airflow in the cylinder to blow out electric arcs, the inner protective sleeve 7 can prevent the contact finger 4 from directly contacting with hot airflow, the contact finger 4 is protected from being damaged by the hot airflow, and the contact resistance of the anti-stop and static arc contact is increased.

The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings (if any) are used to distinguish relative relationships in position, and are not necessarily qualitative. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a moving arc contact of SF6 circuit breaker, a serial communication port, contact main part including the cylinder, contact main part's one end is provided with a plurality of fingers of touching, a plurality of circumference evenly distributed along contact main part that touch, be provided with interior protective sheath on contact main part's the inner wall, the external diameter of interior protective sheath suits with contact main part's internal diameter, the one end of interior protective sheath contacts with touching the finger, the terminal surface looks parallel and level of keeping away from on the other end and the contact main part and touching finger one end, the cover is equipped with outer water conservancy diversion cover on being close to the one end periphery that touches the finger in the contact main part, it still is provided with the annular on the outer wall of the one end that keeps away from to touch the finger in the contact main part, the annular is located outer water conservancy diversion cover and keeps away from the tip that touches the finger.

2. The moving arc contact of the SF6 circuit breaker of claim 1, wherein the contact body is a split type arrangement including a first contact body and a second contact body, the first contact body is fixedly connected to the contact finger, the ring groove is provided on the second contact body, and the contact surfaces of the first contact body and the second contact body are engaged with each other.

3. The moving arc contact of the SF6 circuit breaker as claimed in claim 2, wherein the outer wall of the first contact body is further provided with a backing ring, the backing ring is located between the first contact body and the outer deflector sleeve, the length of the backing ring is greater than that of the first contact body, and one end of the backing ring is flush with one end of the outer deflector sleeve close to the contact finger.

4. The moving arc contact of the SF6 circuit breaker of claim 2, wherein the outer guide sleeve includes a large diameter section and a small diameter section, the large diameter section is located at a side close to the ring groove, a threaded through hole is formed on the large diameter section, a corresponding threaded hole is formed on the second contact body, and a screw passes through the threaded through hole and the threaded hole to lock and fix the outer guide sleeve and the second contact body.

5. The moving arc contact of SF6 circuit breaker of claim 1, wherein the contact fingers are resilient contact blades having a contact tab at one end and a contact tab at another end extending into and joggled with the interior cavity of the contact body.

6. The moving arc contact of SF6 circuit breaker as to claim 1, wherein an installation groove is formed on an end of said contact body away from said contact finger, an annular protrusion is formed on an end of said inner protection sleeve, and said installation groove is adapted to a cross-sectional shape of said annular protrusion.

7. The moving arc contact of the SF6 circuit breaker of claim 1, wherein the contact body, contact finger, inner protective sleeve and outer current guiding sleeve are all made of a high temperature resistant metal material containing copper.