CN117747373A - Arc extinguishing system of low-voltage direct-current breaker - Google Patents
Arc extinguishing system of low-voltage direct-current breaker Download PDFInfo
- Publication number
- CN117747373A CN117747373A CN202410109718.8A CN202410109718A CN117747373A CN 117747373 A CN117747373 A CN 117747373A CN 202410109718 A CN202410109718 A CN 202410109718A CN 117747373 A CN117747373 A CN 117747373A
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- Prior art keywords
- arc
- cover plate
- sealing piece
- arc extinguishing
- moving contact
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Links
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 58
- 239000000463 material Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 5
- 229920001778 nylon Polymers 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 230000008033 biological extinction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims 6
- 238000002679 ablation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 76
- 238000010891 electric arc Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses an arc extinguishing system of a low-voltage direct current breaker, and relates to the technical field of power equipment. The arc extinguishing device comprises an air generating chamber, wherein the inner cavity of the air generating chamber completely covers the contact point of a moving contact and a fixed contact, the movement track of the moving contact and the movement track before an arc enters an arc extinguishing grid; the gas production chamber comprises an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are connected relatively through side walls; guide ribs are distributed inwards on the inner side surfaces of the upper cover plate and the lower cover plate; the guide ribs are used for guiding the air flow direction so that the air flow blows in the direction of the arc extinguishing grid inlet; the guide rib is provided with a guide inclined plane in the thickness direction; the guide inclined plane points to the arc extinguishing grid inlet from the inner side surface of the gas generating chamber. According to the invention, the guide rib and the guide inclined plane are arranged in the gas generating chamber to guide the gas generating direction and the gas blowing direction, so that the time for arcing to enter the arc extinguishing grid is reduced, and the ablation of the moving contact and the fixed contact is reduced.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to an arc extinguishing system of a low-voltage direct current breaker.
Background
The low-voltage direct current breaker is used for the opening, short-circuit protection and overload protection of a low-voltage direct current circuit, and because the direct current circuit has no natural zero crossing point, the electric arc is difficult to extinguish, so that the arc extinguishing design of the breaker becomes a primary consideration in the direct current opening process. Besides the magnetic field generated by the arc extinguishing grid is utilized to blow the arc, the gas generating material is utilized to blow the arc, specifically, a large amount of gas is generated after the gas generating material is eroded by the arc, so that the pressure in the arc extinguishing chamber is increased, the pressure difference is formed with the outside, and finally, the gas blowing of the arc is formed through the gas outlet. If the gas generating member is improperly designed, the arc extinguishing chamber may be broken due to excessive pressure, or reverse air blowing may occur, which affects the improvement of breaking performance. Therefore, the design of the gas generating part and the arrangement of the exhaust and arc extinguishing grids of the arc extinguishing chamber are the key points of arc extinguishing design.
Because the explosion chamber of the circuit breaker is not a sealing structure, the position of the gas generating piece is positioned below the movable contact, and the movable contact has a necessary travel track when being opened and closed, the explosion chamber has a larger gap at the movable contact besides the vent hole. Therefore, when the gas generating piece is corroded by electric arc to generate gas, the gas can be discharged outside through the exhaust port of the arc extinguishing grid on one hand, and the generated gas can also diffuse from the moving contact to the inside of the circuit breaker due to the compressibility of the gas. This diffusion may cause the arc to blow in reverse direction, which erodes the stationary contact and affects the speed of the arc entering the arc chute.
Disclosure of Invention
The invention aims at solving the technical problems, and provides an arc extinguishing system of a low-voltage direct current breaker, which is beneficial to reducing the time for arcing to enter an arc extinguishing grid by arranging a guide rib and a guide inclined plane in a gas generating chamber to guide the gas generating direction and the gas blowing direction, thereby reducing the ablation of a moving contact.
The technical scheme adopted by the invention is as follows: the low-voltage direct current breaker arc extinguishing system is used for arc extinction of the low-voltage direct current breaker, and the low-voltage direct current breaker comprises a moving contact, a fixed contact, a plastic package, an arc extinguishing grid and an electromagnetic spiral tube; it comprises
The gas generating chamber is used for generating gas by burning an arc and blowing the arc to the inlet direction of the arc extinguishing grid; the inner cavity of the gas generating chamber covers all the contact point of the moving contact and the fixed contact, the movement track of the moving contact and the movement track before the arc enters the arc extinguishing grid; the gas production chamber comprises an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are connected relatively through side walls; guide ribs are distributed inwards on the inner side surfaces of the upper cover plate and the lower cover plate; the guide ribs are used for guiding the air flow direction so that the air flow blows in the direction of the arc extinguishing grid inlet; the guide rib is provided with a guide inclined plane in the thickness direction; the guide inclined plane points to the arc extinguishing grid inlet from the inner side surface of the gas generating chamber.
As a preferable technical scheme, the gas generating chamber of the arc extinguishing system of the low-voltage direct current breaker further comprises a sliding sealing piece; the sliding sealing piece is provided with a moving contact inlet part of the gas generating chamber; the inner side surfaces of the upper cover plate and the lower cover plate are provided with sliding grooves; the sliding sealing piece is arranged between the upper sliding groove and the lower sliding groove in a sliding way and seals the inlet part of the moving contact; the sliding sealing piece is provided with a through hole; the through hole is used for enabling the moving contact to penetrate through the sliding sealing piece and enabling the moving contact to be linked with the sliding sealing piece; the length of the sliding sealing piece is matched with the length of the sealing of the inlet part of the moving contact, which is required in two states of opening and closing the moving contact.
As the preferable technical scheme, the chute of the arc extinguishing system of the low-voltage direct current breaker is an arc chute; the circle center of the arc chute coincides with the rotation circle center of the movable contact; the matching part of the sliding sealing piece and the sliding groove is also arc-shaped, and the arc circle center of the matching part coincides with the rotation circle center of the moving contact.
As a preferable technical scheme, the inner side surface of a sliding sealing piece of an arc extinguishing system of a low-voltage direct current breaker is provided with at least two gas producing ribs in the horizontal direction of a gas producing chamber; the movable contact is positioned between the gas generating ribs.
As a preferable technical scheme, the arc extinguishing system of the low-voltage direct current breaker is characterized in that a guide part is arranged at one end of the sliding sealing piece, which is positioned on the electromagnetic solenoid; when the movable contact is in an open state, the guide part stretches into a gap between the electromagnetic solenoid and the arc extinguishing grid.
As the preferable technical scheme, the sliding sealing piece of the arc extinguishing system of the low-voltage direct-current breaker is made of Teflon material, and the thickness range of the sliding sealing piece is between 0.2 mm and 1 mm.
As the preferable technical scheme, the sliding sealing piece of the arc extinguishing system of the low-voltage direct current breaker is made of gas-producing nylon, and the thickness range of the sliding sealing piece is between 0.2 mm and 1 mm.
Compared with the traditional low-voltage direct current breaker arc extinguishing system, the upper cover plate and the inner side surface of the lower cover plate of the gas generating chamber in the technical scheme are respectively provided with the guide ribs, after the gas generating chamber is in arcing, the gas flow is rapidly generated, and the gas flow can be rapidly guided to move towards the arc extinguishing grid under the guide of the guide ribs; the gas generated between the distributed guide ribs blows the arcing along the guide inclined plane towards the arc-extinguishing grid in the diffusion direction, the gas flow generated by the upper cover plate and the lower cover plate flows along the guide inclined plane, after the middle converging and rectifying, the vertical movement is counteracted, only the gas flow pointing to the arc-extinguishing grid in the horizontal direction is left, the converged gas flow does not cause the vertical disturbance of the arcing when blowing the arcing, and the arcing is conveniently captured by the V-shaped groove of the arc-extinguishing grid; in the opposite direction, the flow resistance is relatively larger than that of the arc extinguishing grid, so that the diffusion trend of air flowing to the inlet part of the movable contact can be reduced.
The sliding sealing piece can seal the moving contact inlet part of the gas generating chamber in a sliding manner, and is linked with the moving contact passing through the gas generating chamber, when the moving contact is opened and closed, the relative sealing of the moving contact inlet part of the gas generating chamber can be maintained, so that after the gas generating chamber generates gas, the gas flow diffused from the moving contact inlet part is greatly reduced, and the gas flow is reverse gas flow of the arc burning entering the arc extinguishing grid. Therefore, the sealing slide plate ensures normal opening and closing of the movable contact, realizes dynamic sealing of the inlet part of the movable contact of the gas generating chamber, further ensures the stability of the gas blowing flow direction, improves the gas pressure of the gas generating chamber, and further accelerates the speed of the arcing entering the arc extinguishing grid.
Other technical effects of the present invention will be clearly explained in the development of some embodiments.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is an exploded schematic view of the gas-generating chamber.
In the figure, 1, a moving contact; 2. a stationary contact; 3. a plastic package shell; 4. arc extinguishing grid; 5. an electromagnetic solenoid; 6. a gas producing chamber; 7. an upper cover plate; 8. a lower cover plate; 9. a sidewall; 10. a guide rib; 11. a guide slope; 12. sliding the sealing sheet; 13. a moving contact inlet part; 14. a chute; 15. a through hole; 16. a gas generating rib; 17. a guiding part.
Detailed Description
As shown in fig. 1 and 2, an arc extinguishing system of a low-voltage direct current breaker is used for arc extinction of the low-voltage direct current breaker, and the low-voltage direct current breaker comprises a moving contact 1, a fixed contact 2, a plastic package 3, an arc extinguishing grid 4 and an electromagnetic spiral tube 5; it comprises
A gas generating chamber 6 configured to generate gas by burning an arc, and blow the arc toward the inlet of the arc extinguishing grid 4; the inner cavity of the gas generating chamber 6 completely covers the contact point of the moving contact 1 and the fixed contact 2, the movement track of the moving contact 1 and the movement track before the electric arc enters the arc extinguishing grid 4; the gas production chamber 6 comprises an upper cover plate 7 and a lower cover plate 8; the upper cover plate 7 and the lower cover plate 8 are oppositely connected through a side wall 9; the inner side surfaces of the upper cover plate 7 and the lower cover plate 8 are internally provided with guide ribs 10; the guide ribs 10 are used for guiding the air flow direction so as to blow the air flow into the direction of the inlet of the arc extinguishing grid 4; the guide rib 10 is provided with a guide slope 11 in the thickness direction; the guiding inclined plane 11 points from the inner side surface of the gas generating chamber 6 to the inlet of the arc extinguishing grid 4.
As shown in fig. 1, the gas generating chamber 6 is mounted on the plastic package 3 and is in butt joint with the inlet of the arc extinguishing grid 4, the gas generating chamber 6 is generally formed by injection molding of a nylon gas generating material, and when arcing, the inner side surface of the gas generating chamber 6 can rapidly generate hydrogen-containing gas to blow the arc into the arc extinguishing grid 4. In this embodiment, the guide rib 10 is also subject to arc hot erosion to generate gas, and the guide rib 10 increases the arc ablation area, and the overall gas yield is higher. The air generated by the upper cover plate 7, the lower cover plate 8 and the guide ribs 10 is blown out along the guide inclined plane 11 through the guide channels among the guide ribs 10, is converged at the middle part of the thickness direction of the gas generating chamber 6, and the air flow after convergence is changed to be horizontally directed to the inlet direction of the arc extinguishing grid 4.
As an optimization scheme of the embodiment, the gas generating chamber 6 further comprises a sliding sealing piece 12; the sliding sealing piece 12 is provided with a moving contact inlet part 13 of the gas generating chamber 6; the inner side surfaces of the upper cover plate 7 and the lower cover plate 8 are provided with sliding grooves 14; the sliding sealing piece 12 is arranged between the upper chute 14 and the lower chute 14 in a sliding manner and seals the moving contact inlet part 13; the sliding sealing piece 12 is provided with a through hole 15; the through hole 15 is used for the moving contact 1 to penetrate through the sliding sealing piece 12 and for the moving contact 1 to be linked with the sliding sealing piece 12; the length of the sliding sealing piece 12 is adapted to the length of the movable contact inlet 13 required to be sealed in the two states of opening and closing the movable contact 1.
In actual assembly, a gap is reserved between the moving contact 1 and the through hole 15, and the existence of the gap can allow the moving contact 1 and the sliding sealing piece 12 to rotate or displace relatively, so that the clamping between the moving contact 1 and the sliding sealing piece is prevented from affecting the action of the moving contact 1. The sliding sealing piece 12 is produced by adopting a thinner insulating high-temperature-resistant material, so that the weight is reduced as much as possible, and the influence on the opening and closing speed of the movable contact 1 is prevented; in addition, an installation gap is reserved between the sliding groove 14 and the sliding sealing piece 12, and insulating lubricant such as fully-synthesized fluorine grease can be filled in the gap to ensure that the sliding of the sliding sealing piece 12 is flexible and free from jamming. The working states of the sliding sealing piece 12 are divided into two types, namely a closing state and a separating state of the following moving contact 1; in both states, the length is sufficient to simultaneously slide and seal the moving contact inlet portion 13 of the gas generating chamber 6.
As a further optimization of this embodiment, the chute 14 is an arc chute; the circle center of the arc chute coincides with the rotation circle center of the movable contact 1; the matching part of the sliding sealing piece 12 and the chute 14 is also arc-shaped, and the arc circle center of the matching part coincides with the rotation circle center of the moving contact. By adopting the arc chute and the arc sliding sealing piece 12, the contact between the sliding sealing piece 12 and the moving contact 1 can be ensured not to generate relative sliding and rotation, and the moving contact 1 provides the greatest power for the sliding sealing piece 12 when rotating. This makes it possible to maximally reduce the movement resistance of the movable contact 1.
As a further optimization of the present embodiment, the inner side surface of the sliding sealing piece 12 is provided with at least two gas-generating ribs 16 in the horizontal direction of the gas-generating chamber 6; the movable contact 1 is positioned between the gas-generating ribs 16. In the gas generating chamber 6, the position of the gas generating rib 16 is the region closest to the electric arc, the gas generating rib is positioned at the position farthest from the arc extinguishing grid 4 in the gas generating chamber 6, the local pressure at the position is highest after gas generation, and then the gas is rapidly diffused towards the arc extinguishing grid 4, so that the arcing gas can be ensured to be sequentially diffused from the moving contact inlet part 13 of the gas generating chamber 6 to the arc extinguishing grid 4 all the time.
As a further optimization of the present embodiment, the sliding seal piece 12 is provided with a guide portion 17 at one end of the electromagnetic solenoid 5; when the moving contact 1 is in the open state, the guide 17 protrudes into the gap between the electromagnetic solenoid 5 and the arc extinguishing gate 4. In order to increase the inner cavity space of the gas generating chamber 6, the arrangement position of the sliding sealing piece 12 is close to the axial center point of the moving contact 1 as much as possible, so that the length, weight and resistance of the sliding sealing piece 12 can be reduced. But causes the movement trace of the sliding seal piece 12 to touch the electromagnetic solenoid 5, and the purpose of the guide portion 17 is to guide the movement trace of the sliding seal piece 12 into the gap between the electromagnetic solenoid 5 and the arc extinguishing grid 4.
As an alternative to this embodiment, the sliding sealing plate 12 is made of teflon and has a thickness ranging between 0.2 mm and 0.5 mm. The Teflon material has excellent self-lubricating property, high temperature resistance and high insulation and long service life.
As another alternative of this embodiment, the sliding seal piece 12 is made of gas-generating nylon, and has a thickness ranging from 0.2 mm to 0.5 mm. The sliding sealing piece 12 is made of gas-producing nylon, so that the gas-producing speed can be further improved, and the arc extinguishing time can be reduced.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art that when the combination of technical solutions is contradictory or cannot be implemented, the combination of technical solutions should be regarded as not existing and not falling within the scope of protection claimed by the present invention.
Claims (7)
1. An arc extinguishing system of a low-voltage direct current breaker is used for arc extinction of the low-voltage direct current breaker, and the low-voltage direct current breaker comprises a moving contact, a fixed contact, a plastic package, an arc extinguishing grid and an electromagnetic spiral tube; the method is characterized in that: comprising
The gas generating chamber is used for generating gas by burning an arc and blowing the arc to the inlet direction of the arc extinguishing grid; the inner cavity of the gas generating chamber covers all the contact point of the moving contact and the fixed contact, the movement track of the moving contact and the movement track before the arc enters the arc extinguishing grid; the gas production chamber comprises an upper cover plate and a lower cover plate; the upper cover plate and the lower cover plate are connected relatively through side walls; guide ribs are distributed inwards on the inner side surfaces of the upper cover plate and the lower cover plate; the guide ribs are used for guiding the air flow direction so that the air flow blows in the direction of the arc extinguishing grid inlet; the guide rib is provided with a guide inclined plane in the thickness direction; the guide inclined plane points to the arc extinguishing grid inlet from the inner side surface of the gas generating chamber.
2. A low voltage dc breaker arc suppression system according to claim 1, wherein: the gas generating chamber also comprises a sliding sealing piece; the sliding sealing piece is provided with a moving contact inlet part of the gas generating chamber; the inner side surfaces of the upper cover plate and the lower cover plate are provided with sliding grooves; the sliding sealing piece is arranged between the upper sliding groove and the lower sliding groove in a sliding way and seals the inlet part of the moving contact; the sliding sealing piece is provided with a through hole; the through hole is used for enabling the moving contact to penetrate through the sliding sealing piece and enabling the moving contact to be linked with the sliding sealing piece; the length of the sliding sealing piece is matched with the length of the sealing of the inlet part of the moving contact, which is required in two states of opening and closing the moving contact.
3. A low voltage dc breaker arc suppression system according to claim 2, wherein: the chute is an arc chute; the circle center of the arc chute coincides with the rotation circle center of the movable contact; the matching part of the sliding sealing piece and the sliding groove is also arc-shaped, and the arc circle center of the matching part coincides with the rotation circle center of the moving contact.
4. A low voltage dc breaker arc suppression system according to claim 3, wherein: at least two gas producing ribs are arranged on the inner side surface of the sliding sealing piece in the horizontal direction of the gas producing chamber; the movable contact is positioned between the gas generating ribs.
5. A low voltage dc breaker arc suppression system according to claim 2, wherein: one end of the sliding sealing piece, which is positioned on the electromagnetic solenoid, is provided with a guide part; when the movable contact is in an open state, the guide part stretches into a gap between the electromagnetic solenoid and the arc extinguishing grid.
6. A low voltage dc breaker arc suppression system according to claim 2, wherein: the sliding sealing piece is made of Teflon material, and the thickness range of the sliding sealing piece is between 0.2 mm and 1 mm.
7. A low voltage dc breaker arc suppression system according to claim 2, wherein: the sliding sealing piece is made of gas-producing nylon, and the thickness range of the sliding sealing piece is between 0.2 mm and 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410109718.8A CN117747373B (en) | 2024-01-26 | 2024-01-26 | Arc extinguishing system of low-voltage direct-current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410109718.8A CN117747373B (en) | 2024-01-26 | 2024-01-26 | Arc extinguishing system of low-voltage direct-current breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117747373A true CN117747373A (en) | 2024-03-22 |
| CN117747373B CN117747373B (en) | 2024-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410109718.8A Active CN117747373B (en) | 2024-01-26 | 2024-01-26 | Arc extinguishing system of low-voltage direct-current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117747373B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2595168A1 (en) * | 2011-11-19 | 2013-05-22 | Abb Ag | Installation switching device with ante-chamber and guidance fins |
| DE102017204942A1 (en) * | 2017-03-23 | 2018-09-27 | Siemens Aktiengesellschaft | Electromechanical protection device |
| CN218160069U (en) * | 2022-05-12 | 2022-12-27 | 上海正泰智能科技有限公司 | Arc extinguishing system and circuit breaker |
| CN219534457U (en) * | 2023-05-05 | 2023-08-15 | 温州伍盛电器有限公司 | Arc extinguishing chamber |
| CN117012589A (en) * | 2023-07-08 | 2023-11-07 | 芜湖县伯特利电器有限公司 | Multilayer series arc extinguishing system of circuit breaker |
-
2024
- 2024-01-26 CN CN202410109718.8A patent/CN117747373B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2595168A1 (en) * | 2011-11-19 | 2013-05-22 | Abb Ag | Installation switching device with ante-chamber and guidance fins |
| DE102017204942A1 (en) * | 2017-03-23 | 2018-09-27 | Siemens Aktiengesellschaft | Electromechanical protection device |
| CN218160069U (en) * | 2022-05-12 | 2022-12-27 | 上海正泰智能科技有限公司 | Arc extinguishing system and circuit breaker |
| CN219534457U (en) * | 2023-05-05 | 2023-08-15 | 温州伍盛电器有限公司 | Arc extinguishing chamber |
| CN117012589A (en) * | 2023-07-08 | 2023-11-07 | 芜湖县伯特利电器有限公司 | Multilayer series arc extinguishing system of circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117747373B (en) | 2024-09-20 |
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