阅读说明：本技术 一种真空灭弧室触头 (Vacuum arc-extinguishing chamber contact ) 是由 谢祎铎 黄小龙 喻祥 史炎林 何承瑶 陈飞帆 于 2021-08-06 设计创作，主要内容包括：本发明提供了一种真空灭弧室触头,包括阳极侧触头片、阴极侧触头片、阳极侧导电杆、阴极侧导电杆、阳极侧杯座、阳极侧一号弹簧、阳极侧二号弹簧、阴极侧一号弹簧、阴极侧二号弹簧。本发明采用耐高温,高强度,弹性系数高的弹簧,达到了缓冲减震的效果,有利于触头开断时巨大的冲击,提高了整体机械强度。同时又利用弹簧,巧妙的设计出触头正常工作结构与开断时结构的转换,在正常工作时导电杆杆接触触头片,电流流过的横截面积增大,有利于降低温升,延长触头寿命。弹簧旋向为顺时针(从阳极往阴极),开断时的电流可以被利用于产生磁场,二次加强了纵向磁场,缓解电弧收缩有利于灭弧。弹簧的使用可有效的控制动、静触头间的压力,达到压力过小接触电阻增大与压力过度产生形变间的有效平衡。触头片开槽数增加,进一步抑制了涡流,减小了剩磁。本发明提供的真空灭弧室触头相较于传统杯状纵磁触头,额定工作时温升小,开断时纵向磁场大,开断成功率高,抗冲击能力强,剩磁小,有助于真空断路器开断能力的进一步提升。(The invention provides a vacuum arc extinguish chamber contact, which comprises an anode side contact blade, a cathode side contact blade, an anode side conducting rod, a cathode side conducting rod, an anode side cup seat, an anode side first spring, an anode side second spring, a cathode side first spring and a cathode side second spring. The invention adopts the spring with high temperature resistance, high strength and high elastic coefficient, achieves the effect of buffering and damping, is beneficial to the huge impact when the contact is disconnected, and improves the overall mechanical strength. Meanwhile, the spring is utilized, the conversion between the normal working structure and the structure when the contact is switched on and off is skillfully designed, the conducting rod contacts the contact blade when the contact is normally operated, the cross section area through which current flows is increased, the temperature rise is favorably reduced, and the service life of the contact is prolonged. The spring is clockwise (from the anode to the cathode), the current can be used for generating a magnetic field when the switch is switched on and off, the longitudinal magnetic field is secondarily strengthened, and arc contraction is relieved, so that arc extinction is facilitated. The use of the spring can effectively control the pressure between the brake and the static contact, and the effective balance between the increase of the contact resistance due to small pressure and the deformation caused by excessive pressure is achieved. The number of slots of the contact blade is increased, so that eddy current is further inhibited, and remanence is reduced. Compared with the traditional cup-shaped longitudinal magnetic contact, the vacuum arc-extinguishing chamber contact provided by the invention has the advantages that the temperature rise is small during rated work, the longitudinal magnetic field is large during opening and closing, the opening and closing success rate is high, the impact resistance is strong, the residual magnetism is small, and the opening and closing capacity of the vacuum circuit breaker is further improved.)

1. A vacuum interrupter contact, characterized in that the vacuum interrupter contact comprises:

an anode side contact blade;

a cathode side contact blade disposed opposite one side of the cathode side contact blade from one side of the anode side contact blade;

the anode side cup seat is connected with the other side of the anode side contact blade;

the cathode side cup seat is connected with the other side of the cathode side contact blade;

the anode side conducting rod is matched with the other side of the anode side cup seat;

the cathode side conducting rod is matched with the other side of the cathode side cup seat;

the first spring on the anode side is positioned in the cup seat on the anode side and is far away from the contact blade on the anode side;

the second spring on the anode side is positioned in the cup seat on the anode side and is close to the contact blade on the anode side;

the cathode side first spring is positioned in the cathode side cup seat and is far away from the cathode side contact blade;

the cathode side second spring is positioned in the cathode side cup seat and is close to the cathode side contact blade;

2. the vacuum interrupter contact of claim 1, wherein the cathode side contact blade, the anode side contact blade, the cathode side conductive rod, the anode side conductive rod, and the spring are all located on a same axis.

3. The vacuum interrupter contact of claim 1, the anode side contact blade and the cathode side contact blade being both circular flat plate slotted electrodes. The total number of the 6 equant outer slots and the 6 equant inner slots is 6, and the interval angles of the 12 slots are all 30 DEG

4. The vacuum interrupter contact of claim 2, wherein the annular protrusion of the conductive rod is closely attached to the inner wall of the cup holder and can slide along the inner wall under mechanical external force.

5. The vacuum interrupter contact of claim 4, wherein the first and second anode side springs are located on opposite sides of the annular protrusion of the anode side conductive rod, attached to the anode side conductive rod, and always in a compressed state.

6. The vacuum interrupter contact of claim 4, wherein the first and second springs are located on opposite sides of the annular protrusion of the cathode side conductive rod, and are attached to the cathode side conductive rod and always in a compressed state.

7. Vacuum interrupter contact according to claim 6, characterized in that all spring turns are clockwise (seen from anode to cathode).

8. The vacuum interrupter contact of claim 7, wherein the anode side conductive rod and the cathode side conductive rod are cylinders with annular protrusions and recesses.

Technical Field

The invention relates to the field of electrical equipment, in particular to a contact of a vacuum arc extinguish chamber.

Background

The circuit breaker plays a dual role in protection and control in the power system, and the breaking performance of the circuit breaker is very important. Vacuum circuit breakers using vacuum as the insulating and arc quenching medium have an absolutely dominant status in the medium voltage field of the power system due to their excellent performance, and are currently developing towards high voltage and large current.

In the process of opening and closing the vacuum circuit breaker, a contact material is evaporated and ionized to form vacuum arc plasma, the vacuum arc can generate an obvious contraction effect under the action of strong magnetic hoop contraction force of a magnetic field, so that the surface of the contact is seriously ablated, and a large amount of metal steam and particles are provided for the arc column plasma to cause failure of opening and closing. Therefore, the current commercial vacuum arc-extinguishing chamber contact system usually adopts a longitudinal magnetic field control technology to control the vacuum arc, so that the vacuum arc still presents a diffusion state at a larger current, and the breaking capacity is improved.

However, the current longitudinal magnetic field contact system has the following disadvantages: 1. when the cup-shaped longitudinal magnetic contact system operates at rated current, the conductive area is relatively small due to structural reasons, so that the contact generates heat seriously, potential safety hazards exist, and the service life is shortened; 2. the contact structure is easy to damage under the condition of no good buffer because of great mechanical impact during the breaking, so that the subsequent use of the contact is influenced; 3. in order to ensure the mechanical strength and other relevant reasons, the magnetic field generated by the existing cup-shaped longitudinal magnetic contact is relatively small, and the surface of the contact is easy to be seriously ablated when a large current is cut off.

Disclosure of Invention

The invention aims to provide a contact structure of a vacuum arc-extinguishing chamber, which skillfully utilizes a spring structure, designs a contact capable of changing the state of the contact, improves a contact blade structure and solves a series of problems of temperature rise, buffering, magnetic field and the like.

In order to achieve the purpose, the invention provides the following scheme:

a vacuum interrupter contact, comprising:

an anode side contact blade;

a cathode side contact blade disposed opposite one side of the cathode side contact blade from one side of the anode side contact blade;

the anode side cup seat is connected with the other side of the anode side contact blade;

the cathode side cup seat is connected with the other side of the cathode side contact blade;

the anode side conducting rod is matched with the other side of the anode side cup seat;

the cathode side conducting rod is matched with the other side of the cathode side cup seat;

the first spring on the anode side is positioned in the cup seat on the anode side and is far away from the contact blade on the anode side;

the second spring on the anode side is positioned in the cup seat on the anode side and is close to the contact blade on the anode side;

the cathode side first spring is positioned in the cathode side cup seat and is far away from the cathode side contact blade;

the cathode side second spring is positioned in the cathode side cup seat and is close to the cathode side contact blade;

optionally, the cathode side contact blade, the anode side contact blade, the cathode side conductive rod, the anode side conductive rod, and the spring are all located on the same axis.

Optionally, the anode side contact blade and the cathode side contact blade are both circular flat plate slotted electrodes.

Optionally, the inner diameter of the anode side cup is larger than the spring; the inner diameter of the cathode side cup is larger than the spring.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a contact structure of a vacuum arc extinguish chamber, which comprises an anode side contact blade, a cathode side contact blade, an anode side conducting rod, a cathode side conducting rod, an anode side cup seat, an anode side first spring, an anode side second spring, a cathode side first spring and a cathode side second spring. Wherein the cathode side contact blade is arranged opposite to one side of the cathode side contact blade and one side of the anode side contact blade; the anode side cup seat is connected with the other side of the anode side contact blade; the cathode side cup seat is connected with the other side of the cathode side contact blade; the anode side conducting rod is matched with the other side of the anode side cup seat; the cathode side conducting rod is matched with the other side of the cathode side cup seat; the first spring on the anode side is positioned in the cup seat on the anode side and is far away from the contact blade on the anode side; the second spring on the anode side is positioned in the cup seat on the anode side and is close to the contact blade on the anode side; the cathode side first spring is positioned in the cathode side cup seat and is far away from the cathode side contact blade; the cathode side second spring is positioned in the cathode side cup seat and is close to the cathode side contact blade;

the invention distinguishes the normal working state and the disconnection state of the contact by adding the spring device, the sectional area of the conductor is large and the temperature rise is small during the normal working, the spring buffers during the arc extinguishing, and simultaneously plays the role of an iron core, thereby further increasing the longitudinal magnetic field, relieving the contraction of the electric arc during the current breaking, leading the electric arc to be in a diffusion state, reducing the ablation of the contact during the arc burning process, and further ensuring the breaking capacity of the vacuum circuit breaker. Compared with the traditional cup-shaped longitudinal magnetic contact structure, the vacuum arc-extinguishing chamber contact structure provided by the invention has the advantages of strong impact resistance, small rated working temperature rise, small contact ablation during switching on and switching off, and high arc-extinguishing success rate, thereby being beneficial to further improving the switching-on and switching-off capacity of the vacuum circuit breaker.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 to obtain other drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a vacuum interrupter contact according to the present invention.

Fig. 2(a) is an axial sectional view of a vacuum interrupter contact of the present invention in normal operation.

Fig. 2(b) is an axial sectional view of the vacuum interrupter contact of the present invention at the time of opening.

Figure 3 is a schematic view of the slotting of the contact blade of the vacuum interrupter contact of the present invention.

Description of the symbols:

the anode comprises an anode side conducting rod-1, an anode side cup-2, an anode side contact blade-3, an anode side spring-4, an anode side spring-5, a cathode side contact blade-6, a cathode side spring-7, a cathode side spring-8, a cathode side cup-9 and a cathode side conducting rod-10.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 protection scope of the present invention. The invention aims to provide a contact of a vacuum arc-extinguishing chamber, which is used for ensuring the improvement of the breaking capacity of a vacuum circuit breaker and reducing the temperature rise during normal work.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 2(a), the contact structure of the vacuum interrupter of the present invention mainly includes an anode side conductive rod-1, an anode side cup-2, an anode side contact blade-3, an anode side first side spring-4, an anode side second spring-5, a cathode side contact blade-6, a cathode side second spring-7, a cathode side first spring-8, a cathode side cup-9, and a cathode side conductive rod-10.

Specifically, as shown in fig. 1, one side of the cathode side contact blade 6 is disposed opposite to one side of the anode side contact blade 3; the anode side conducting rod 1 is matched with the anode side cup seat 2; the cathode side conducting rod 10 is engaged with the cathode side cup holder 9.

As shown in fig. 3, the cathode side contact blade 6 and the anode side contact blade 3 both adopt a slotting process, and 6 equally divided outer slots and 6 equally divided inner slots are provided, and 12 slotting angles are all 30 °. By adopting the design of multiple slots, the eddy current generation during the on-off process is reduced to a greater extent, the residual magnetic field is reduced, and the on-off success rate is improved.

As shown in fig. 1, the anode side cup 2 and the cathode side cup 9 both adopt a sliding mode, and both are engaged with their corresponding conductive rods instead of being connected. The conducting rod can slide along the inner wall of the cup seat under the action of the spring and the external force. The anode side cup base 2 and the cathode side cup base 9 both adopt the structure of the cup wall of the traditional cup-shaped contact, and 6 grooves are formed in the cup wall, but the structure is not limited by the grooves.

Further, as shown in fig. 2(a), the first anode side spring 4 and the second anode side spring 5 are both located in the anode side cup 2 and are both attached to the anode side conductive rod 1, both are distinguished and fixed by the annular protrusion on the anode side conductive rod 1, and both are in a compressed state during normal operation and disconnection. As shown in fig. 2(b), the structures of the cathode side first spring 8 and the cathode side second spring 7 are the same.

In the present embodiment, the material of the anode-side first spring 4, the anode-side second spring 5, the cathode-side first spring 8, and the cathode-side second spring 7 is Inconel, CrV, or CrSi. However, the present invention is not limited to this, and may be adjusted according to actual needs. All springs are rotated clockwise as viewed from the anode to the cathode, because although the spring resistance is large due to the material, a part of the current flows through the spring, and the rotation direction is controlled to generate an induced magnetic field from the anode to the cathode, which is referred to as a second magnetic field. Arc extinction is facilitated.

Preferably, as shown in fig. 2(a), the anode side conductive rod 1 and the cathode side conductive rod 10 are both cylinders, and there are projections and depressions at some positions therebetween, and the radii are slightly different.

Further, the inner diameter of the anode side cup seat is larger than the diameters of the anode side first spring 4 and the anode side second spring 5; the same applies to the cathode side.

In this embodiment, the anode side contact blade 3 serves as a fixed contact, the cathode side contact blade 6 serves as a movable contact, and the conductive rod can freely slide in the cup by arranging the conductive rod protrusion to be closely attached to the inner wall of the cup, so as to realize the function of switching between the normal operating mode and the on-off mode.

Compared with the traditional cup-shaped longitudinal magnetic contact structure, the contact blade slotting structure is improved, certain mechanical strength can be eliminated due to the buffering of the spring, slotting is increased, eddy current is further reduced, residual magnetism is weakened, and the arc extinguishing success rate is increased.

The cross-sectional area that traditional cup is indulged magnetic contact and is required more heavy current to flow through in order to pass through the electric current of bigger grade, the control temperature rise often makes the contact size bigger, and this scheme is ingenious to be distinguished with the contact structure of normal during operation and the contact structure when breaking, and the conducting rod links to each other with the contact piece when normal during operation, and the electric current cross-sectional area is big, has solved the temperature rise problem, also can bear the electric current of bigger grade simultaneously, is favorable to vacuum circuit breaker's the further promotion of ability of breaking.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist in understanding the core concepts of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.