Forced isolation arc extinguishing contact device of universal circuit breaker

Abstract

The invention discloses a forced isolation arc extinguishing contact device of a universal circuit breaker, which comprises a moving contact, a static contact, a static contact housing, a door opening plate, an arc extinguishing cover, an arc extinguishing grid sheet, a forced arc extinguishing cover, a moving busbar and an arc striking sheet, and is characterized in that the upper end part of the moving contact is in contact connection with the static contact, and the static contact is fixed in the static contact housing; the static contact housing is provided with a hole for the contact of the moving contact and the static contact, the door opening plate can slide up and down on one side of the static contact housing, the moving contact and the static contact are contacted, the door opening plate moves to open, the moving contact and the static contact are separated, and the door opening plate moves downwards to close, so that a forced isolation function is realized. A reliable isolation fracture is provided, accidental power incoming is prevented, and the safety of a power system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, in particular to a universal circuit breaker forced isolation arc extinguishing contact device. Background Art

[0002] At present, most air circuit breakers use air blowing, magnetic blowing and grid arc extinguishing chamber to achieve short-circuit disconnection. The upper limit of the breaking capacity of this structure is low, and it is highly dependent on the breaking speed of the arc extinguishing chamber mechanism. In addition, the arc is easy to reignite after extinguishing, and the safety performance is not strong. Summary of the Invention

[0003] The present invention innovates the contact system. During short-circuit disconnection, the insulating material in the contact cavity is linked with the moving contact. At the same time as the disconnection, this part completely closes the static contact. While cutting off the arc, the two conductors of the moving and static contacts are completely isolated to achieve a structure that extinguishes the arc and prevents reignition.

[0004] Technical solution: To solve the above problems, the present invention adopts the following technical solution.

[0005] A universal circuit breaker forced isolation arc extinguishing contact device comprises a moving contact, a static contact, a static contact cover, a door plate, an arc extinguishing cover, an arc extinguishing grid, a forced arc extinguishing cover, a moving busbar, and an arc striking piece. The arc extinguishing cover is installed on the upper part of the entire structure, the arc extinguishing grid is fixed in the arc extinguishing cover, and the forced arc extinguishing cover is nested inside the arc extinguishing cover and is located on the outside of the arc extinguishing grid; the arc striking piece is fixed to the lower part of the arc extinguishing grid, above the contact point of the moving and static contacts, the lower part of the moving contact is connected to the moving busbar, and the moving contact moves under the drive of the mechanism, which is characterized in that the upper end of the moving contact is contact-connected with the static contact, the static contact is fixed inside the static contact cover, a hole for contact between the moving contact and the static contact is opened on the static contact cover, the door plate can slide up and down on one side of the static contact cover, the moving and static contacts are in contact, the door plate moves to open, the moving and static contacts are disengaged, and the door plate moves downward to close.

[0006] Furthermore, four holes are provided on the static contact cover, which are square holes arranged parallel to each other and side holes arranged symmetrically. The side of the static contact cover is provided with a groove for the door opening plate to slide up and down. The vertical direction of the door opening plate is connected to the static contact cover by a spring. The door opening plate is provided with three holes, the lower hole is the same size as the upper square hole of the static contact cover, and a side square hole is provided on each side. The long sides of the two side square holes are larger than the side holes on the static contact cover. The door opening plate is provided with two push rods passing through the two side square holes and the side holes. The lower part of one end of the push rod has an arc-shaped protrusion, and the other end is provided with a contact part that contacts the moving contact. The part where the push rod passes through the hole is set at the lower part of the side square hole of the door opening plate. The push rod can move axially to drive the door opening plate to move.

[0007] Furthermore, the contact portion of the push rod is a rectangular block made of insulating material.

[0008] Furthermore, the push rod is a cylindrical rod.

[0009] Furthermore, a push rod spring is provided in the push rod, and a push rod groove is provided on the door opening plate, and the push rod is elastically connected to the push rod groove through the push rod spring.

[0010] Furthermore, a contact piece in contact with the contact portion is provided on the moving contact.

[0011] Furthermore, the radius of the arc-shaped protrusion is equivalent to the distance the door panel moves in the direction of opening.

[0012] Furthermore, the moving contact is provided with a main contact point and an arc contact point.

[0013] The working principle of the present invention is: (1) Closing process: After the circuit breaker receives the closing command, the mechanism drives the moving contact to move, and the moving contact moves in an arc with the side clamp support point. During the movement of the moving contact, the contact piece on the moving contact first contacts the contact part of the top rod. Since the contact part is a rectangular block of insulating material, the safety of the contact is guaranteed. As the moving contact moves, the top rod is pushed by the moving contact and moves axially. The arc-shaped protrusion at the lower end of one end of the top rod interacts with the door opening plate. Because the radius of the arc-shaped protrusion is greater than the distance the door opening plate moves, the axial movement of the top rod can accurately drive the door opening plate to overcome the spring thrust and slide upward along the groove on the side of the static contact cover to open. When the door panel fully opens, the main contact or arcing contact (depending on the design, only one of these contacts is in contact with the static contact at a time) at the upper end of the moving contact makes contact with the static contact, completing the circuit. At this point, the arc striker, located above the moving and static contact points, guides the arc when the circuit breaker is subsequently opened, allowing it to quickly enter the arc extinguishing zone.

[0014] (2) Opening process: When the circuit breaker receives the opening command, the mechanism drives the moving contact to move toward the circuit breaker, and the moving contact is separated from the static contact. The main contact separates the arc contact first, and the arc contact separates. At this time, an arc is generated between the moving and static contacts. The arc striker quickly guides the arc upward, and the arc enters the arc extinguishing area composed of the arc extinguishing cover, the arc extinguishing grid and the forced arc extinguishing cover. The arc extinguishing grid divides the arc into multiple short arcs. Using the short arc principle, it accelerates the arc extinguishing process and reduces the arc erosion of the contacts. When the moving contact moves downward and separates from the static contact, the top rod is no longer pushed by the moving contact. The arc-shaped protrusion is reset with the top rod. Under the action of the spring, the door plate slides down along the groove on the side of the static contact cover to close the hole. The closing of the door plate forms a reliable isolation fracture, which seals the conductor and cuts off the arc root, preventing the arc from conducting with the static contact, realizing the forced isolation function and cutting off the energy that generates subsequent arcs.

[0015] The beneficial effects of the present invention are: 1. The present invention can quickly cut off the arc from the arc root to form a closed insulating isolation layer through the synergistic effect of the arc extinguishing hood, arc extinguishing grid and forced arc extinguishing hood, and at the same time introduce the arc generated when the moving and static contacts are disconnected into the arc extinguishing area, and use the arc extinguishing grid to divide the arc into multiple short arcs, accelerate the extinction of the arc, effectively reduce the arc erosion of the contacts, and improve the service life of the contacts. 2. When the moving and static contacts make contact, the door panel moves open. When the moving and static contacts disengage, the door panel moves downward and closes, achieving a forced isolation function. This design provides a reliable isolation gap after the circuit breaker is opened, preventing unexpected power outages and improving power system safety. 3. The coordinated design of the ejector rod, door plate, and static contact housing, as well as the unique structural design of the moving contact, ensures smooth and stable movement of the entire contact structure, ensuring reliable circuit breaker operation. Furthermore, the use of insulating materials and rational conductive contact design further enhance the structural safety and electrical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of the overall structure of the present invention.

[0017] FIG2 is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the static contact cover of the present invention.

[0019] Figure 4 It is a structural schematic diagram of one side of the static contact cover of the present invention.

[0020] Figure 5 This is a structural diagram of the other side of the static contact cover of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] A universal circuit breaker forced isolation arc extinguishing contact device, comprising a moving contact 1, a static contact, a static contact cover 3, a door panel 4, an arc extinguishing cover 5, an arc extinguishing grid 6, a forced arc extinguishing cover 7, a moving busbar 8, and an arc striking piece 9. The arc extinguishing cover 5 is installed on the upper part of the entire structure, the arc extinguishing grid 7 is fixed in the arc extinguishing cover 5, and the forced arc extinguishing cover 7 is nested in the arc extinguishing cover 5 and is located on the outside of the arc extinguishing grid 6; the arc striking piece 9 is fixed at the lower part of the arc extinguishing grid 7, above the contact point of the moving and static contacts. The lower part of the moving contact 1 is connected to the moving busbar 8, and the moving contact 1 moves under the drive of the mechanism. It is characterized in that: the upper end of the moving contact 1 is in contact with the static contact, and the static contact is fixed inside the static contact cover 3. The static contact cover 3 is provided with a hole for contact between the moving contact 1 and the static contact, and the door plate 4 can slide up and down on one side of the static contact cover 3. The moving and static contacts are in contact, the door plate 4 moves open, the moving and static contacts are disengaged, and the door plate 4 moves downward to close.

[0023] Furthermore, the static contact cover 3 is provided with four holes, namely square holes 10 arranged parallel to each other in the upper and lower parts and side holes 11 arranged symmetrically. The side of the static contact cover 3 is provided with a groove for the door opening plate 4 to slide up and down. The vertical direction of the door opening plate 4 is connected to the static contact cover 3 by a spring 22. The door opening plate 4 is provided with three holes, the lower hole 12 is the same size as the lower square hole 10 of the static contact cover 3, and a side square hole 13 is provided on each side. The long sides of the two side square holes 13 are larger than the side holes 11 on the static contact cover 4. The door opening plate 4 is provided with two push rods 14 passing through the two side square holes 13 and the side hole 11. The lower part of one end of the push rod 14 has an arc-shaped protrusion 16, and the other end is provided with a contact portion 15 that contacts the moving contact 1. The part where the push rod 14 passes through the hole is set at the upper part of the square hole 13 on the edge of the door opening plate. The push rod 14 can move axially to drive the door opening plate 4 to move.

[0024] Furthermore, the contact portion 15 of the push rod 14 is a rectangular block made of insulating material.

[0025] Furthermore, the push rod 14 is a cylindrical rod.

[0026] Furthermore, a push rod spring 21 is provided in the push rod 14, and a push rod groove 25 is provided on the door opening plate. The push rod is elastically connected to the push rod groove 25 through the push rod spring 21, and the push rod groove 25 is provided with a groove for the arc-shaped protrusion to move.

[0027] Furthermore, the moving contact 1 is provided with a contact piece 16 that contacts the contact portion 15 .

[0028] Furthermore, the radius of the arc-shaped protrusion 16 is greater than the distance that the door opening plate 14 moves.

[0029] Furthermore, the moving contact 1 is provided with a main contact point and an arc contact 17 contact point 18 .

[0030] like Figure 3 As shown, in the open state, the arc surface of the arc-shaped protrusion 16 contacts the lower edge of the edge hole 11 of the door opening plate 14. When the switch is closed, the arc-shaped protrusion 16 moves horizontally and slides in contact with the lower edge of the edge hole 11. As the arc-shaped protrusion 16 penetrates into the groove of the push rod groove 25, it pushes the door opening plate 14 to move.

[0031] The working principle of the forced isolation arc extinguishing contact structure of the circuit breaker of the present invention is based on the physical process of arc generation, arc extinguishing and contact isolation. When the moving and static contacts are separated and closed, an arc will be generated due to the rapid change of current. The arc extinguishing part uses the electromagnetic force and the characteristics of the arc itself through the arc extinguishing cover 5, the arc extinguishing grid 6 and the forced arc extinguishing cover 7 to introduce the arc into the arc extinguishing area and divide it into short arcs, thereby accelerating the extinction of the arc. The forced isolation part relies on the mechanical coordination of the top rod, the door plate 4 and the static contact cover 4 to realize the automatic opening and closing of the door plate when the contacts are separated and closed, thereby forming a reliable isolation fracture. The special structural design of the moving contact reasonably distributes the conductive and arc extinguishing tasks through the switching of the main contact contact point and the arc contact contact point, thereby further improving the working performance.

[0032] When the circuit breaker of the present invention receives the closing command, the mechanism drives the moving contact to move. In the process of the moving contact 1 gradually approaching the static contact, the moving contact 1, according to the design, first contacts the static contact with the main contact point. The main contact point is responsible for the main current transmission task when the circuit is normally turned on. Its design and material can meet the requirements of stable and low-resistance current conduction under normal operating current, ensuring the power system Normal operation. At this time, the arc contact point 18 is in a separated state from the static contact and does not participate in the conduction process.

[0033] When the circuit breaker receives an opening command, the moving contact 1 separates from the stationary contact. At the moment of separation, the current cannot be instantly interrupted, causing an arc to form between the moving and stationary contacts. At this point, the movement of the moving contact causes the main contact to separate from the stationary contact, and the arcing contact gradually approaches the stationary contact, eventually making contact. The material and structure of the arcing contact are specifically designed for arc generation and extinguishing conditions, providing excellent resistance to arc erosion. After the arc contact point 18 of the present invention contacts the static contact, the arc-strike plate quickly guides the arc upward, causing it to enter the arc extinguishing area composed of the arc extinguishing hood, arc extinguishing grid, and forced arc extinguishing hood. The arc extinguishing grid divides the arc into multiple short arcs, utilizing the short arc principle to accelerate the extinction of the arc. Throughout the arc extinguishing process, the arc contact point withstands the high temperature and ablation of the arc, protecting the main contact point from severe damage by the arc, thereby extending the overall service life of the contact. When the arc is completely extinguished, the moving contact continues to move in an arc shape, the arc contact point separates from the static contact, and the door plate closes under the action of the spring, forming a reliable isolation fracture. The present invention realizes efficient conduction and reliable arc extinguishing functions through the division of labor and cooperation between the main conductor contact and the arc contact during the closing and opening processes of the circuit breaker, and ensures the safe and stable operation of the power system.

[0034] The door opening plate 4 of the present invention is tightly connected to the static contact housing 3, the push rod 14, and the spring, forming a precise mechanical linkage system. A groove is provided on the side of the static contact housing 3 for the door opening plate 4 to slide up and down, providing a track for the movement of the door opening plate 4. The door opening plate 4 is vertically connected to the static contact housing 3 via a spring, which provides a restoring force, enabling the door opening plate to automatically reset. The door opening plate 4 is provided with three holes, the lower hole being adapted to the lower square hole of the static contact housing 3, and the side square holes on both sides being adapted to the side holes of the static contact housing 3. The push rod 14 is inserted through the push rod 14, which becomes a key component for driving the movement of the door opening plate 4. The arc-shaped protrusion at the lower end of the push rod 14 and the contact portion at the other end that contacts the moving contact are the core structures for achieving force transmission and motion conversion.

[0035] When the circuit breaker closes, the mechanism drives the moving contact in an arcuate motion. The lower portion of the moving contact is connected to the moving busbar, and the contact piece on the moving contact gradually approaches the contact portion of the ejector pin (a rectangular block of insulating material). As the moving contact 1 continues to move, the contact piece contacts the contact portion of the ejector pin 14, exerting a thrust. This thrust overcomes the spring force of the ejector spring 25 in the ejector slot 25, causing ejector pin 14 to move axially. During closing, the curved protrusion at the lower end of the push rod 14 interacts with the door opening plate 14. The axial movement of the push rod transmits force to the door opening plate through the curved protrusion. This force causes the door opening plate to overcome the tension of the spring and slide upward along the groove on the side of the static contact housing. As the moving contact continues to move, the contact portion of the push rod continuously pushes the door opening plate until it is fully opened, clearing space for the main contact or arcing contact at the upper end of the moving contact to contact the static contact to complete the circuit. At this point, the door opening plate is in the open position, completing its corresponding movement during the closing process and ensuring smooth contact between the moving and static contacts.

[0036] During opening, upon receiving the opening command, the moving contact, driven by the mechanism, begins an arc-shaped motion, gradually separating from the stationary contact. As the moving contact moves, its thrust on the ejector pin gradually dissipates. Without external force, the ejector pin, influenced by factors such as the ejector spring force and any reaction force from the door opening plate, moves in the opposite axial direction to reset itself. At this point, the spring's restoring force causes the door plate to slide downward along the groove on the side of the static contact housing. The spring is stretched during closing, storing elastic potential energy. This energy is released during opening, driving the door plate back to its original position. As the moving contact continues its downward motion until it completely disengages from the static contact, the door plate, driven by the combined force of the spring and the movement of the ejector rod, slides downward to its fully closed position, creating a reliable isolation gap. This prevents unexpected power outages, fulfills the circuit breaker's mandatory isolation function, and ensures power system safety.

[0037] The present invention also includes a transformer 20, which is installed near the busbar near the incoming or outgoing terminals of the circuit breaker. A current transformer is installed on the side of the busbar near the incoming power supply to monitor the current flowing through the circuit breaker. A voltage transformer is installed in the circuit near the incoming terminal of the circuit breaker to detect the circuit voltage.

[0038] The device closes the static contact and cuts off the arc from the root of the static contact. At the same time, the insulating part closes and isolates the static contact, forming a high insulation layer between the moving contact and the static contact, forcibly blocking the arc from conducting with the static contact. The device uses PA66 gas-generating material to enhance the gas blowing effect, which is more conducive to the arc entering the arc extinguishing chamber, and forced isolation and gas blowing can extinguish the arc more effectively.

Claims

1. A universal circuit breaker forced isolation arc extinguishing contact device, comprising a moving contact, a static contact, a static contact housing, a door panel, an arc extinguishing hood, an arc extinguishing grid, a forced arc extinguishing hood, a moving busbar, and an arc striking piece. The arc extinguishing hood is mounted on the upper portion of the entire structure, the arc extinguishing grid is fixed within the arc extinguishing hood, and the forced arc extinguishing hood is nested within the arc extinguishing hood and located outside the arc extinguishing grid. The arc striking piece is fixed to the lower portion of the arc extinguishing grid, above the contact point between the moving and static contacts. The lower portion of the moving contact is connected to the moving busbar. The moving contact moves under the drive of a mechanism. The device is characterized by: The upper end of the moving contact is in contact connection with the static contact, and the static contact is fixed inside the static contact cover. The static contact cover is provided with a hole for the moving contact and the static contact to contact. The door plate can slide up and down on one side of the static contact cover. When the moving and static contacts are in contact, the door plate moves to open the hole channel, the moving and static contacts are disengaged, and the door plate moves downward to close the hole.

2. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: Four holes are provided on the static contact cover, which are square holes arranged parallel to each other and side holes arranged symmetrically. The side of the static contact cover is provided with a groove for the door opening plate to slide up and down. The vertical direction of the door opening plate is connected to the static contact cover by a spring. Three holes are provided on the door opening plate. The lower hole is the same size as the upper square hole of the static contact cover. A side square hole is provided on each side. The long sides of the two side square holes are larger than the side holes on the static contact cover. Two top rods passing through the two side square holes and the side holes are provided on the door opening plate. The lower part of one end of the top rod has an arc-shaped protrusion, and the other end is provided with a contact part that contacts the moving contact. The part where the top rod passes through the hole is set at the lower part of the square hole of the door opening plate. The top rod can move axially to drive the door opening plate to move.

3. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: The contact portion of the push rod is a rectangular block made of insulating material.

4. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: The push rod is a cylindrical rod.

5. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: A push rod spring is provided in the push rod, a push rod groove is provided on the door opening plate, the push rod is elastically connected to the push rod groove through the push rod spring, and a groove for the arc-shaped protrusion to move is provided on the push rod groove.

6. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: The moving contact is provided with a contact piece that contacts the contact portion.

7. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: The radius of the arc-shaped protrusion is greater than the distance the door panel moves in the opening direction.

8. The universal circuit breaker forced isolation arc extinguishing contact device according to claim 1, characterized in that: The moving contact is provided with a main contact point and an arc contact point.

Images