Arc extinguish chamber and DC frame isolation switch
By designing an arc extinguishing chamber with arc-induced plate group, arc stop plate and lead angle in the DC frame isolation switch, combining gas production and air blowing arc extinguishing technology, the arc erosion and breakdown problems are solved, and the rapid segmentation of arcs is achieved and Extinguishing, improving the insulation and electrical life of the equipment.
Patent Information
- Application Number
- CN202420021712.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-01-04
AI Technical Summary
Under high voltage conditions, the arc of the DC frame isolating switch can easily erode the arc chamber shell, resulting in breakdown and arc running, losing the normal arc extinguishing function, affecting the safety and life of the equipment.
An arc extinguishing chamber including a shell and an arc extinguishing assembly is designed. The arc extinguishing assembly is composed of an arc-induced plate group, an arc-barrier plate, a guide angle, etc. The arc-induced plate group guides the arc into the DC frame isolation switch through the guide angle to block the The arc plate and partition combine gas production and air blowing arc extinguishing technology, and the arc moves along the intermediate area to avoid breakdown and accelerate arc division through U-shaped notch and staggered design.
Effectively avoid arc breakdown of the shell, improve the insulation of the arc extinguishing chamber and arc division capability, extend the electrical life of the equipment, and ensure the rapid extinguishing and cutting of the arc.
Smart Images
Figure CN222320024U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of isolating switches, in particular to an arc extinguishing chamber and a DC frame isolating switch. Background Art
[0002] The DC frame disconnector is installed on the line side of the inverter on the DC side of the power generation system. It can isolate and protect the inverter, and plays an important role in personal safety and equipment protection. However, with the increase in system scale and wider application conditions, the requirements for DC frame disconnectors are also increasing. The rated working voltage has increased from DC600V to DC1000V and then to DC1500V. Under high voltage, the withstand capacity, insulation performance, and DC arc handling of the switch are all considerable challenges.
[0003] Therefore, in terms of improving the performance of DC frame disconnectors, the most important part is to improve the arc extinguishing chamber system, especially the arc extinguishing chamber. Since the disconnector needs to be frequently disconnected in new energy occasions, it must have a long electrical life. The electrical arc can easily erode the side wall of the arc extinguishing chamber shell, easily causing the arc extinguishing chamber to break down and cause arc running, thus losing the normal arc extinguishing function. Utility Model Content
[0004] Therefore, the utility model provides an arc extinguishing chamber and a DC frame isolating switch to solve the above problems.
[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:
[0006] An arc extinguishing chamber comprises a shell and an arc extinguishing assembly, wherein the shell has an arc extinguishing cavity and a bottom opening connected to the arc extinguishing cavity, the arc extinguishing assembly is assembled in the arc extinguishing cavity, the arc extinguishing assembly comprises an arc striking plate group, an arc baffle plate and an arc lead, the arc striking plate group comprises a plurality of arc striking plates arranged at intervals along the front-to-back direction, the arc baffle plate has two arc strikers, which are respectively arranged on the left and right sides of the bottom of the arc striking plate group, the arc lead is arranged on the front side of the arc striking plate group and assembled on the shell through the left and right side walls, and notches are arranged on the left and right sides of the bottom of the arc lead so that the bottom of the arc lead is located between the two arc baffle plates and extends toward the bottom opening.
[0007] Furthermore, the arc baffle plate is a gas-generating arc baffle plate, and the arc baffle plate includes a first part arranged at the bottom of the arc-striking plate group and a second part arranged at the rear side of the arc-striking plate group, and the first part and the second part are integrally connected.
[0008] Furthermore, the upper surface of the first part of the arc baffle plate is recessed to form a clearance groove to make way for the foot of the arc-starting plate of the arc-starting plate group; and a clearance notch is also provided on the outer side of the foot of the arc-starting plate.
[0009] Furthermore, the arc baffle plate is provided with a buckle, and the shell is provided with a bayonet, and the arc baffle plate is snap-fitted into the bayonet of the shell through the buckle thereon to achieve snap-fitting and fixing.
[0010] Furthermore, a U-shaped notch is provided at the bottom of the arc-striking plate, and the U-shaped notches of two adjacent arc-striking plates are staggered; the number of arc-striking plates in the arc-striking plate group is at least 18, and the surface has a nickel-plated layer.
[0011] Furthermore, the arc extinguishing assembly also includes a partition, which is assembled between the arc striking plates of the arc striking plate group, and the bottom of the partition is an elastic part and extends to the bottom opening; a groove is provided in the middle position of the partition.
[0012] Furthermore, the shell is formed by splicing two left and right arc-extinguishing chamber side walls.
[0013] Furthermore, the arc extinguishing assembly also includes an arc isolation plate, a flame extinguishing plate and a mesh plate, which are located above the arc striking plate group and are arranged in sequence from bottom to top; an exhaust port connected to the arc extinguishing chamber is opened on the top of the shell.
[0014] Furthermore, the arc isolation plate is provided with ventilation holes arranged in an array; the flame extinguishing plate is 60° to the horizontal line and is integrally connected to the outer shell; the number of the mesh plates is two and they are arranged in an upper and lower interval, the mesh holes of the upper and lower mesh plates are both diamond mesh holes, and the long diagonals of the diamond mesh holes of the upper and lower mesh plates are perpendicular to each other.
[0015] A DC frame disconnector comprises at least the arc extinguishing chamber mentioned above.
[0016] The technical solution provided by the utility model has the following beneficial effects:
[0017] The arc enters the arc extinguishing chamber, is divided by the arc-starting plate group, and is led to the moving contact of the DC frame disconnector through the lead angle to form a circuit; the notches on the left and right sides of the bottom of the lead angle make the arc move only along the middle area to prevent the arc from breaking through the shell. In addition, during the assembly process, the notches on the left and right sides of the bottom of the lead angle play a role of giving way to facilitate the installation of the arc baffle. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 The figure shows a three-dimensional structural schematic diagram of the arc extinguishing chamber in the embodiment;
[0019] Figure 2 The figure shows a schematic diagram of the structure decomposition of the arc extinguishing chamber in the embodiment;
[0020] Figure 3 Shown is a bottom view of the arc extinguishing chamber in the embodiment;
[0021] Figure 4Shown is a schematic diagram of the structure of the lead angle in the embodiment;
[0022] Figure 5 The figure shows a schematic diagram of the structure of the arc baffle in the embodiment;
[0023] Figure 6 Shown is a schematic structural diagram of a single arc-extinguishing chamber side wall in an embodiment;
[0024] Figure 7 The figure shows the structure schematic diagram of the arc striking plate assembly in the embodiment;
[0025] Figure 8 The figure shows a schematic diagram of the structure of a single arc-starting plate in the embodiment;
[0026] Fig. 9 The figure shows a schematic diagram of the structure of the partition in the embodiment;
[0027] Fig.10 The structure diagram of the arc isolation plate in the embodiment is shown;
[0028] Fig.11 The figure shows a partial structural schematic diagram of the DC frame disconnector in the embodiment in the closed state;
[0029] Fig.12 The figure shows a partial structural schematic diagram of the DC frame disconnector in the embodiment in the open state. DETAILED DESCRIPTION
[0030] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0031] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0032] Reference Figures 1 to 12 As shown, this embodiment provides an arc extinguishing chamber, including a shell 10 and an arc extinguishing assembly, the shell 10 has an arc extinguishing cavity 101 and a bottom opening 102 connected to the arc extinguishing cavity 101, specifically, the shell 10 is spliced by left and right arc extinguishing chamber side walls 11; the arc extinguishing assembly is assembled in the arc extinguishing cavity 101.
[0033] Specifically, the arc extinguishing assembly includes an arc-striking plate group 20, an arc-blocking plate 40 and an angle 30. The arc-striking plate group 20 includes a plurality of arc-striking plates 21 arranged at intervals in the front-to-back direction. There are two arc-blocking plates, which are respectively arranged on the left and right sides of the bottom of the arc-striking plate group. The angle 30 is arranged on the front side of the arc-striking plate group and assembled on the shell through the left and right side walls. Specifically, a plurality of slots 111 are arranged on the left and right arc-extinguishing chamber side walls 11, and each arc-striking plate 21 and the angle 30 at the front end are all snapped into the corresponding slots 111; notches 32 are arranged on the left and right sides of the bottom of the angle 30, so that the bottom of the angle 30 is located between the two arc-blocking plates 40 and extends toward the bottom opening 102; that is, notches 32 are arranged on the left and right sides of the bottom of the angle 30, so that the bottom of the angle 30 forms a tongue 31 located in the middle, such as Figure 3 As shown, the tongue piece 31 is located between the two arc baffles 40 and extends toward the bottom opening 103 .
[0034] Continue to refer to Fig.11 and Fig.12 As shown, this embodiment also provides a DC frame disconnector, which at least includes the arc extinguishing chamber described above.
[0035] Specifically, Fig.12 As shown, when the moving contact 2 and the stationary contact 1 of the DC frame disconnector are disconnected, the generated arc is introduced into the arc extinguishing chamber from the rear end, and the arc extends from the back to the front on the arc-starting plate group 20, and extends to the lead angle 30 after being divided by the arc-starting plate group 20, and is led from the lead angle 30 to the moving contact 2 from top to bottom, forming a loop. Among them, when passing through the bottom of the lead angle 30, due to the notches 32 set on the left and right sides of the bottom of the lead angle 30, the arc will only move along the middle area (along the position of the tongue 31), that is, the arc can only pass through the channel formed by the left and right arc baffles 40, and although the arc erodes the arc baffles 40, it cannot directly break through the housing 10. This effectively prevents the arc from breaking through the housing 10.
[0036] In addition, during the assembly process, the notches 32 on the left and right sides of the bottom of the lead angle 30 play a role of making way, which facilitates the installation of the arc baffle 40.
[0037] Further preferably, in this embodiment, the arc baffle 40 is a gas-generating arc baffle made of PA46 material; when the arc passes through at high temperature, gas is generated, which quickly takes the arc into the lead 30 to prevent the arc from flowing back. The arc extinguishing of the grid and the arc extinguishing of the gas blowing are combined, and the arc extinguishing effect is good.
[0038] The arc baffle plate 40 includes a first portion 41 disposed at the bottom of the arc striking plate group 20 and a second portion 42 disposed at the rear side of the arc striking plate group 20. Such an arrangement can change the arc movement path, so that the arc can enter the inner cavity of the arc extinguishing chamber quickly and regularly along the set path. The first portion 41 and the second portion 42 are connected and arranged in one piece, which reduces the number of parts and installation steps, and speeds up assembly efficiency. Of course, in other embodiments, the first portion 41 and the second portion 42 can also be separated.
[0039] The upper surface of the first part 41 of the arc baffle plate 40 is recessed to form a clearance groove 411 to make way for the foot 22 of the arc-starting plate 21 of the arc-starting plate group 20; a clearance notch 23 is also provided on the outer side of the foot 22 of the arc-starting plate 21 for making way for the installation of the first part 41.
[0040] The first portion 41 of the arc baffle plate 40 is thickened to better resist arc erosion to protect the housing 10. Specifically, the first portion 41 of the arc baffle plate 40 is thickened in the following manner: in the thickness direction, the thickness of the side wall of the clearance groove 411 of the arc baffle plate 40 in contact with the arc extinguishing chamber side wall 11 is 2 mm, while the thickness of the side wall facing inward (i.e., away from the arc extinguishing chamber side wall 11) is 4 mm; before the improvement, the overall thickness of the arc baffle plate 40 is 2 mm.
[0041] The arc baffle plate 40 is provided with a buckle 412, and the housing 10 is provided with a bayonet 112. Specifically, both left and right arc extinguishing chamber side walls 11 have bayonet 112, and the arc baffle plate 40 is clamped into the bayonet 112 on the corresponding arc extinguishing chamber side wall 11 through the buckle 412 thereon to achieve clamping and fixing, thereby achieving stable installation of the arc baffle plate 40. Of course, in other embodiments, the fixing method of the arc baffle plate is not limited to this.
[0042] The number of arc-striking plates 21 of the arc-striking plate group 20 is at least 18, and in this embodiment, 18, to improve the ability to split the arc, and the surface of the arc-striking plate 21 has a nickel-plated layer to improve the hardness and corrosion resistance, thereby improving the arc erosion resistance and the arc voltage that each arc-striking plate 21 can withstand. The bottom of the arc-striking plate 21 is also provided with a U-shaped notch 24, and the U-shaped notches 24 of two adjacent arc-striking plates 21 are staggered, so that the U-shaped notches 24 of the arc-striking plate group 20 form a staggered distribution; the staggered design of the U-shaped notches 24 distorts the magnetic flux path generated by the arc current, generates a suction force pulling toward the arc-striking plate, and causes the arc to quickly enter the arc-striking plate 21 and be split into many series short arcs.
[0043] Specifically, in the arc-striking plate group 20 , the two frontmost arc-striking plates 21 are smaller in size than the other arc-striking plates 21 , so as to facilitate the assembly of the lead angle 30 .
[0044] Of course, in other embodiments, the structure and number of the arc-striking plates 21 of the arc-striking plate group 20 are not limited thereto.
[0045] In another preferred embodiment, the arc extinguishing assembly further includes a partition 50, which is assembled between the arc striking plates 21 of the arc striking plate group 20, and the bottom of the partition 50 is an elastic portion 53 extending to the bottom opening 103. Fig. 9 As shown, the elastic part 53 is shaped like a fishtail. The partition plate 50 is arranged so that the movable contact 2 naturally presses against the head of the movable contact 2 during the closing process, is naturally bent and is not subjected to force. When the movable contact 2 is disconnected, it is reset by inertia and is always placed in front of the movable contact 2. After the movable contact is disconnected, it naturally presses against the contact point to separate the movable contact 2 and the stationary contact 1, thereby forcibly cutting off the small arc.
[0046] A slot 51 is provided in the middle of the partition 50 so that the arc can enter the cavity without being blocked by the partition 50 and thus forming a complete circuit.
[0047] Further preferably, the partition 50 is located between the 11th arc-striking plate 21 and the 12th arc-striking plate 21 from back to front, so as to ensure that the reliable closure of the moving contact 2 and the static contact 1 is not affected during the closing process of the switch, and the moving contact 2 and the static contact 1 can be separated in time during the disconnection, thereby solving the problem that the critical load current cannot be cut off.
[0048] Specifically, the partition plate 50 is further provided with plug-in ports 52 on the left and right sides, and is plugged into the arc-blocking plates 40 on the left and right sides through the plug-in ports 52 to achieve stable assembly.
[0049] Of course, in other embodiments, the structure of the partition 50 is not limited thereto, or the structure of the partition 50 is not adopted.
[0050] In another preferred embodiment, the arc extinguishing assembly also includes an arc isolation plate 61, a flame extinguishing plate 62 and a mesh plate 63, and the arc isolation plate 61, the flame extinguishing plate 62 and the mesh plate 63 are located above the arc striking plate group 20 and are arranged in sequence from bottom to top; an exhaust port 103 connected to the arc extinguishing chamber 101 is opened at the top of the shell 10.
[0051] Specifically, the arc isolation plate 61 is provided with an array of vent holes 611, which are specifically circular through holes; they can increase the pressure difference between the inside and outside of the arc extinguishing chamber, which is beneficial for the discharge of high-pressure gas to the outside of the product, and for the arc to enter the inside of the arc extinguishing chamber to prevent the arc and gas from recombining, and can also prevent solid particles from flying out.
[0052] The flame extinguishing piece 62 is 60° with the horizontal line and is integrally connected to the housing 10; as in this embodiment, a plurality of flame extinguishing pieces 62 are integrally formed on each arc extinguishing chamber side wall 11, and when the left and right arc extinguishing chamber side walls 11 are spliced, they are combined to form a flame extinguishing piece group. The integral connection structure of the flame extinguishing piece 62 and the housing 10 reduces the number of parts and makes the overall structure compact. Of course, in other embodiments, the flame extinguishing piece 62 can also be assembled on the housing 10.
[0053] There are two mesh plates 63 arranged at intervals, and the mesh holes of the upper and lower mesh plates 63 are both diamond mesh holes, and the long diagonal lines of the diamond mesh holes of the upper and lower mesh plates 63 are perpendicular to each other. The free metal particles in the ionized state are eliminated, and zero arcing can be achieved.
[0054] The arc extinguishing chamber provided in this embodiment solves the problem of insufficient arc extinguishing of the traditional DC frame disconnector and the problem of preventing the arc extinguishing chamber from being punctured. By combining the arc extinguishing of the grid and the arc extinguishing of the gas blow, it can not only cool the arc, but also generate a driving force for the arc, thereby accelerating the arc extinguishing speed. The arc striking plate group 20 with U-shaped notches 24 staggeredly distributed reduces the arc movement path, and the pressure difference formed by the arc baffle plate 40 and the arc isolation plate 631 in the cavity and the atmospheric pressure accelerates the speed at which the arc enters the arc striking plate group 20. The number of arc striking plates 21 is increased and a nickel-plated layer is provided on the surface, thereby improving the arc pressure dividing capacity of the arc striking plate 21. The unique design of the left and right arc baffle plates 40 and the lead angle 30 compresses the arc channel, allowing most of the arc to pass through the middle, avoiding puncturing the left and right arc extinguishing chamber side walls 11, thereby improving the insulation of the arc extinguishing chamber. The arc isolation plate 61, the flame extinguishing plate 62 inclined at 60° and the staggered diamond mesh plates (i.e., two mesh plates 63) can absorb and block the arc and arc slag layer by layer, absorb the free ions, and achieve zero arcing performance. The newly designed partition 50 can force the moving contact 2 to cut off the small arc during the disconnection process, and does not affect the reliable closure of the moving and static contacts during the connection process, thereby solving the problem that the critical load current cannot be cut off. Through the above solution, it is possible to quickly extinguish the large DC arc entering the cavity and cut off the small arc in the air, meeting the actual use effect.
[0055] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. An arc extinguishing chamber, comprising a housing and an arc extinguishing assembly, wherein the housing has an arc extinguishing cavity and a bottom opening communicating with the arc extinguishing cavity, and the arc extinguishing assembly is assembled in the arc extinguishing cavity, characterized in that: The arc extinguishing assembly includes an arc-starting plate group, an arc-blocking plate and a lead angle. The arc-starting plate group includes a plurality of arc-starting plates arranged at intervals in the front-to-back direction. There are two arc-blocking plates, which are respectively arranged on the left and right sides of the bottom of the arc-starting plate group. The lead angle is arranged on the front side of the arc-starting plate group and assembled on the shell through the left and right side walls. Notches are arranged on the left and right sides of the bottom of the lead angle so that the bottom of the lead angle is located between the two arc-blocking plates and extends toward the bottom opening direction.
2. The arc extinguishing chamber according to claim 1, characterized in that: The arc baffle is a gas-generating arc baffle, and includes a first portion arranged at the bottom of the arc-starting plate group and a second portion arranged at the rear side of the arc-starting plate group, and the first portion and the second portion are integrally connected.
3. The arc extinguishing chamber according to claim 2, characterized in that: The upper surface of the first part of the arc baffle plate is recessed to form a clearance groove to make way for the foot of the arc-starting plate of the arc-starting plate group; the outer side of the foot of the arc-starting plate is also provided with a clearance notch.
4. The arc extinguishing chamber according to claim 1, characterized in that: The arc baffle plate is provided with a buckle, and the shell is provided with a bayonet. The arc baffle plate is clamped in the bayonet of the shell through the buckle on the arc baffle plate to achieve clamping and fixing.
5. The arc extinguishing chamber according to claim 1, characterized in that: A U-shaped notch is also provided at the bottom of the arc-striking plate, and the U-shaped notches of two adjacent arc-striking plates are staggered; the number of arc-striking plates in the arc-striking plate group is at least 18, and the surface has a nickel-plated layer.
6. The arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing assembly also includes a partition, which is assembled between the arc striking plates of the arc striking plate group. The bottom of the partition is an elastic part and extends to the bottom opening; the middle position of the partition is provided with a groove.
7. The arc extinguishing chamber according to claim 1, characterized in that: The shell is formed by splicing two left and right arc extinguishing chamber side walls.
8. The arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing assembly also includes an arc isolation plate, a flame extinguishing plate and a mesh plate, which are located above the arc striking plate group and are arranged in sequence from bottom to top; an exhaust port connected to the arc extinguishing chamber is opened on the top of the shell.
9. The arc extinguishing chamber according to claim 8, characterized in that: The arc isolation plate is provided with ventilation holes arranged in an array; the flame extinguishing plate is 60° with the horizontal line and is integrally connected to the outer shell; there are two mesh plates and they are arranged in an upper and lower interval, the mesh holes of the upper and lower mesh plates are both diamond mesh holes, and the long diagonal lines of the diamond mesh holes of the upper and lower mesh plates are perpendicular to each other.
10. A DC frame disconnector, characterized in that: At least comprises the arc extinguishing chamber described in any one of claims 1 to 9.