An arc extinguishing device for a switch

Abstract

The utility model relates to a kind of arc extinguishing device of switch, belong to low-voltage electrical apparatus technical field.Arc extinguishing chamber includes a pair of side plates, a plurality of louver is arranged between a pair of side plates and a pair of gas generating parts, a plurality of louver is spaced apart from each other, a pair of gas generating parts are oppositely arranged, and form the horn mouth of lower big and upper small in upward direction, characterized by: gas generating part further includes gas generating convex part, and gas generating convex part is located in the inside of horn mouth.Advantages: the gas generating convex part can be in full contact with arc, can absorb arc energy, and release insulating gas, accelerate arc extinguishing.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an arc-extinguishing device for a switch. Background Technology

[0002] Switches are crucial electrical appliances in power supply and distribution lines. They interrupt the current carrying the circuit, protecting the lines and electrical equipment. A switch typically includes a contact system, which consists of moving and stationary contacts. When the moving contact actuates, it contacts or separates from the stationary contact, thus enabling the switch to conduct or disconnect. As is known in the industry, when a switch breaks, an electric arc is generated between the moving and stationary contacts. Due to the relatively large energy of the arc, breaking the switch becomes extremely difficult. Therefore, switches usually include an arc-extinguishing chamber to extinguish the arc generated when the moving and stationary contacts separate. The circuit is only broken when the arc is extinguished. The role of the arc-extinguishing chamber in ensuring the safe operation of electrical equipment is undeniable.

[0003] In existing technologies, an electric arc is typically generated on a contact system. The arc passes through an arc channel formed between a pair of gas-generating components and enters a grid assembly in the arc-extinguishing chamber. The grid assembly cuts the arc, extinguishing it. As the arc passes through the arc channel, it typically burns the gas-generating components, helping to absorb arc energy. The arc is more easily extinguished after absorbing energy, but the smooth surface between the gas-generating components makes it difficult to achieve sufficient contact with the arc. Similarly, as mentioned in Japanese Patent Document JP2008186643A, using a wavy texture on the surface also makes it difficult to achieve sufficient contact with the arc. Utility Model Content

[0004] The purpose of this invention is to provide an arc-extinguishing device for a switch, wherein a gas-generating protrusion is provided on the inner side of the flared opening formed between the gas-generating components. When the electric arc rises, it contacts the gas-generating protrusion. The gas-generating protrusion can absorb the electric arc energy and release insulating gas to accelerate the extinguishing of the electric arc.

[0005] The purpose of this utility model is achieved as follows: an arc-extinguishing device for a switch includes an arc-extinguishing chamber. The arc-extinguishing chamber includes a pair of side plates, multiple grid plates disposed between the pair of side plates, and a pair of gas-generating elements. The multiple grid plates are spaced apart from each other. The pair of gas-generating elements are disposed opposite each other and form a flared opening that is larger at the bottom and smaller at the top in the upward direction. The gas-generating element also includes a gas-generating protrusion located inside the flared opening.

[0006] In one specific embodiment of this utility model, the gas-generating protrusion includes a plurality of spaced-apart fins.

[0007] In another specific embodiment of this utility model, the switch further includes a contact system, which includes a moving contact and a stationary contact; the gas generating component further includes a covering portion, which is used to cover the grid legs of the grid plate. The covering portion extends from one end of the arc-extinguishing chamber corresponding to the stationary contact toward the moving contact. The gas generating protrusion is disposed on the covering portion, and the covering portion has a first inclined surface that is inclined inward in the upward direction. The pair of first inclined surfaces on the pair of covering portions constitute the flared mouth.

[0008] In another specific embodiment of this utility model, the first inclined surface is a plane, the contact piece of the moving contact includes a long contact piece and a short contact piece, and the arc-inducing head of the long contact piece is located inside the flared mouth.

[0009] In a further specific embodiment of this utility model, the gas-generating protrusion includes at least two fins, which are spaced apart from each other, and the gas-generating protrusion is integrally formed with the gas-generating component.

[0010] In a further specific embodiment of this utility model, the gas-generating protrusion includes at least two fins, which are spaced apart from each other, and the gas-generating protrusion is individually formed and then installed on the gas-generating component.

[0011] In yet another specific embodiment of this utility model, the gas generating component further includes an extension portion, a pair of extension portions extending toward the contact piece, the space between them forming a front cavity, and the pair of extension portions probing through both ends of the contact piece of the side-by-side moving contact.

[0012] In yet another specific embodiment of this utility model, the flange of the fin is shaped as a triangle with rounded corners at the head.

[0013] In a further specific embodiment of the present invention, the fin has a lower edge on the side facing the air inlet of the arc-extinguishing chamber, and the lower edge is inclined inward in an upward direction.

[0014] In a further specific embodiment of this utility model, the lower edge is a plane, and the angle between it and the horizontal line of the arc-extinguishing chamber is greater than or equal to 10º and less than or equal to 25º.

[0015] Because this utility model adopts the above-mentioned structure, a gas-generating protrusion is provided on the inner side of the flared opening formed between the gas-generating components. Compared with the prior art, the beneficial effect is that the arc can contact the gas-generating protrusion when it rises. The gas-generating protrusion can absorb the arc energy and release insulating gas, thus accelerating the extinguishing of the arc. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the switch in this utility model; Figure 2 This is a three-dimensional schematic diagram of the moving contact and the arc-extinguishing chamber in this utility model; Figure 3 This is a schematic diagram of one side of the moving contact and the arc-extinguishing chamber in this utility model; Figure 4 This is a schematic diagram showing the cooperation between the moving contact and the inside of the arc-extinguishing chamber in this utility model; Figure 5 This is a schematic diagram showing the cooperation between the moving contact and the moving arc-drawing plate in this utility model; Figure 6 This is a three-dimensional schematic diagram of a movable arc-drawing plate according to the present invention; Figure 7 This is a three-dimensional schematic diagram of another type of movable arc-drawing plate in this utility model; Figure 8 This is a front view of the moving arc-drawing plate in the first embodiment of this utility model; Figure 9 This is a three-dimensional schematic diagram of the gas-generating component in the first embodiment of this utility model; Figure 10 This is a side view of the gas-generating component in this utility model.

[0017] In the diagram: 1. Arc-extinguishing chamber; 11. Side plate; 12. Grid plate; 13. Moving arc-starting plate; 131. First part; 132. Second part; 133. Central arc-starting part; 134. Lateral arc-starting part; 135. Relief notch; 136. Mounting protrusion; 14. Gas-generating component; 141. Extension part; 142. Covering part; 143. Mounting rib; 144. Gas-generating protrusion; 1441. Fin; 145. Stationary contact mating part; 146. Inclined part; 15. Arc-extinguishing cover; 16. Anti-freezing bracket; 2. Moving contact; 21. Contact piece; 211. Long contact piece; 2111. Arc-starting head; 212. Short contact piece; 213. Main contact; 214. Arc contact; 22. Contact support; 23. Outlet bar; 3. Shell; 31. Base; 32. Bottom plate. Detailed Implementation

[0018] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0019] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0020] like Figure 1 , Figure 2 The switch includes a disconnector and a circuit breaker. The switch comprises an arc-extinguishing chamber 1, a contact system, and a housing 3. The housing 3 includes a base 31 and a bottom plate 32, which are joined together to form the housing 3. Typically, the base 31 and the bottom plate 32 are secured using threaded fastening.

[0021] The contact system includes a moving contact 2 and a stationary contact (not shown in the figure). The moving contact 2 is mounted on the base 31, while the stationary contact is mounted on the base plate 32. Specifically, the moving contact 2 is rotatably mounted, while the stationary contact is fixedly mounted. After the moving contact 2 actuates, it makes contact with or separates from the stationary contact. The arc-extinguishing chamber 1 is located on one side of the contact system in the opening direction.

[0022] like Figure 2 The arc-extinguishing chamber 1 includes a pair of side plates 11 and multiple grid plates 12 disposed between the pair of side plates 11. The multiple grid plates 12 are spaced apart from each other. The arc-extinguishing chamber 1 also includes a moving arc-initiating plate 13, a deionization component, and an arc-extinguishing cover 15. One end of the moving arc-initiating plate 13 is placed outside the array of grid plates 12 and spaced apart from a nearby grid plate 12. The other end is bent and extends into the interior of the arc-extinguishing chamber 1, forming the extension end of the moving arc-initiating plate 13. The moving arc-initiating plate 13 is located on the side corresponding to the moving contact 2. The deionization component is used to deionize the gas at the outlet side of the grid plate 12. Typically, the deionization component should include a perforated plate (not shown in the figure). The perforated plate is located at the outlet side of the grid plate 12 and is adjacent to the grid plate 12.

[0023] The deionization component includes a deionization bracket 16, which is a frame in shape, and the filter unit of the deionization component is installed inside it. A pair of side plates 11 are fixed to both sides of the deionization bracket 16.

[0024] The arc-extinguishing cover 15 is located at the top of the arc-extinguishing chamber 1, and has an exhaust hole thereon. The gas inside the arc-extinguishing chamber 1 is discharged to the outside of the arc-extinguishing chamber 1 through the exhaust hole on the arc-extinguishing cover 15.

[0025] like Figure 3 , 4The moving contact 2 includes a contact piece 21, a contact support 22, and a lead-out bar 23. Multiple contact pieces 21 are mounted on the contact support 22, typically hinged together by a pivot, allowing the contact pieces 21 to swing with the contact support 22 while maintaining a certain angle of rotational engagement. The lead-out bar 23 is fixed inside the housing 3, with one end extending outside the housing 3. A conductive flexible connection (not shown in the figure) is provided between the lead-out bar 23 and the contact piece 21 to achieve electrical connection. This conductive flexible connection ensures that the contact piece 21 is electrically connected to the lead-out bar 23 without affecting the swinging of the contact piece 21.

[0026] The contact pieces 21 are multiple and arranged side by side. Each contact piece 21 includes long contact pieces 211 and short contact pieces 212. Preferably, there is a group of long contact pieces 211, and each group of long contact pieces 211 includes at least one long contact piece 211. This group of long contact pieces 211 is located in the center of the contact piece 21 array. Specifically, in this embodiment, there are two long contact pieces 211, which are adjacent to each other and form a group. The short contact pieces 212 are divided into two groups, with each group of short contact pieces 212 located on either side of a group of long contact pieces 211. More specifically, in this embodiment, five short contact pieces 212 form one group, that is, ten short contact pieces 212 form two groups.

[0027] like Figure 3 , 4 The arc-extinguishing chamber 1 further includes a pair of gas-generating elements 14, which are respectively located at the lower edge of the grid plate 12. Preferably, the pair of gas-generating elements 14 respectively wrap around a pair of grid plate legs of the grid plate 12. The pair of gas-generating elements 14 are arranged opposite to each other, forming a flared opening between them. The flared opening cooperates with the contact plate 21 to form a flared opening that is wider at the bottom and narrower at the top. Here, the flared opening refers to the portion that narrows on both sides in the upward direction, excluding a straight portion with a constant width or an enlarged portion that increases in the upward direction.

[0028] For the purposes of this invention, the flared opening may refer only to a portion of the space formed by the pair of gas-generating components 14 facing each other, rather than the entire space formed by the pair of gas-generating components 14 facing each other. For example, the flared opening may be located at the lower edge, middle, or upper edge of the space formed by the pair of gas-generating components 14 facing each other.

[0029] See Figure 4 , Figure 5The gas-generating component 14 includes an extension 141. A pair of extensions 141 extend toward the contact piece 21, with the space between them forming a front cavity. The pair of extensions 141 extend past both ends of the side-by-side contact pieces 21, thereby ensuring that the electric arc generated on the contact piece 21 is located within the cavity of the flared opening. Specifically, the extension 141 extends past the head of the short contact piece 212, and the head of the short contact piece 212 is located within the front cavity. Preferably, the arc contact point 214 on the short contact piece 212 is located within the front cavity. The statement that the arc contact point 214 on the short contact piece 212 is located within the front cavity means that the arc contact point 214 is located within the front cavity throughout the entire movement of the short contact piece 212. Meanwhile, the head of the long contact piece 211 is located within the flared opening, specifically within the 1 / 2 region of the enlarged side of the flared opening.

[0030] Furthermore, the flared opening is located between the stationary contact and the extended end of the moving arc-drawing plate 13. Alternatively, the flared opening extends from the stationary contact side toward the moving arc-drawing plate 13 and is offset from the moving arc-drawing plate 13.

[0031] The above-mentioned arrangement can concentrate the electric arc and allow the electric arc to enter the grid plate 12 through the flared opening; and the flared opening has the function of accelerating the airflow, which is conducive to the electric arc entering the grid plate 12 quickly.

[0032] like Figure 4 , 5 This is a schematic diagram showing the interaction between the movable arc-drawing plate 13 and the movable contact 2. Both the long contact plate 211 and the short contact plate 212 are provided with a main contact 213 and an arc contact 214. The arc contact 214 is located above the main contact 213, that is, the arc contact 214 is located on the side of the main contact 213 closer to the grid plate 12. The arc contact 214 is located within the front cavity held by a pair of extensions 141.

[0033] Combination Figure 3 In this embodiment, the arc contact point 214 of the long contact piece 211 is also located below the flared opening. That is, the arc contact points 214 of both the long contact piece 211 and the short contact piece 212 are located below the flared opening.

[0034] Further details to follow. Figure 5 The long contact piece 211 has an extended arc-inducing head 2111. After the long contact piece 211 and the short contact piece 212 are installed, the arc-inducing head 2111 is located on the side of the head of the short contact piece 212 closer to the grid plate 12, that is, the arc-inducing head 2111 is higher than the head of the short contact piece 212. The arc-inducing head 2111 is sickle-shaped and extends and curves towards the back side of the long contact piece 211.

[0035] See you later Figure 6 The movable arc-inducing plate 13 is machined from a metal plate. Alternatively, it can be machined from a metal casting. The movable arc-inducing plate 13 includes a first part 131, a second part 132, a central arc-inducing part 133, and a lateral arc-inducing part 134. The first part 131 is located outside the array of grid plates 12 in the array direction, and is parallel to and spaced apart from a nearby grid plate 21. The second part 132 is located below the first part 131 and bends inward toward the interior of the arc-extinguishing chamber 1. The central arc-inducing part 133 bends inward toward the interior of the arc-extinguishing chamber 1 from the internal notch at the bottom center of the second part 132, while the lateral arc-inducing part 134 bends inward toward the interior of the arc-extinguishing chamber 1 from the lower edge of the second part 132, thus creating a height difference between the central arc-inducing part 133 and the lateral arc-inducing part 134. Specifically, the central arc-drawing portion 133 is located above the lateral arc-drawing portion 134, while the lateral arc-drawing portion 134 is located below the central arc-drawing portion 133.

[0036] The central arc-drawing portion 133 is configured to cooperate with the long contact piece 211, while the lateral arc-drawing portion 134 is configured to cooperate with the short contact piece 212. Preferably, the lateral arc-drawing portions 134 are a pair, located on both sides of the central arc-drawing portion 133. Figure 6 The central arc-drawing portion 133 shown is V-shaped, and similarly, the lateral arc-drawing portion 134 is also V-shaped. That is, the central arc-drawing portion 133 bends inward toward the arc-extinguishing chamber 1 and then bends outward toward the arc-extinguishing chamber 1; similarly, the lateral arc-drawing portion 134 bends inward toward the arc-extinguishing chamber 1 and then bends outward toward the arc-extinguishing chamber 1.

[0037] More preferably, a clearance notch 135 is provided on the outer side of the lateral arc-inducing portion 134. The presence of the clearance notch 135 allows the movable arc-inducing plate 13 to avoid other parts inside the arc-extinguishing chamber 1 during installation. Mounting protrusions 136 are also provided at intervals on both sides of the movable arc-inducing plate 13, and the mounting protrusions 136 are used to install the movable arc-inducing plate 13 between the pair of side plates 11.

[0038] See Figure 7 This is another structure of the moving arc plate 13, which is similar to... Figure 6 The difference between the movable arc-drawing plate 13 shown is that the central arc-drawing portion 133 and the lateral arc-drawing portion 134 are both flat and do not bend outward to form a V-shape.

[0039] See Figure 8The width of the central arc-drawing portion 133 is 'a', and the width of the lateral arc-drawing portions 134 is 'b'. The width of the gap formed between the central arc-drawing portion 133 and the lateral arc-drawing portions 134 is 'c'. Preferably, the width of the central arc-drawing portion 133 is less than or equal to the sum of the widths of the two lateral arc-drawing portions 134. More preferably, the widths of the two lateral arc-drawing portions 134 are equal, and the width 'a' of the central arc-drawing portion 133 is twice the width 'b' of the lateral arc-drawing portions 134.

[0040] After the arc-extinguishing chamber 1 and the moving contact 2 are installed, when the moving contact 2 is rotated to a position directly opposite the central arc-initiating part 133, the distance between the long contact piece 211 and the central arc-initiating part 133 is less than the width c of the notch. Specifically, the distance between the top surface of the arc-initiating head 2111 of the long contact piece 211 and the central arc-initiating part 133 is less than the width c of the notch, thereby preventing the arc from jumping from the central arc-initiating part 133 to the lateral arc-initiating part 134.

[0041] In this embodiment, the width 'a' of the central arc-initiating portion 133 is greater than or equal to the width of a set of long contact pieces 211, and less than or equal to 2.5 times the width of a set of long contact pieces 211. In the above description, after installation, the width of the set of long contact pieces 211 in the width direction, i.e., the direction in which the contact pieces 21 are arranged side-by-side, is the width of the set of long contact pieces 211. This ensures that when an arc is generated on the short contact piece 212, it can smoothly enter the arc-extinguishing chamber while preventing the arc from retreating from the central arc-initiating portion 133 to the lateral arc-initiating portion 134 and causing breakdown on the short contact piece 212.

[0042] like Figure 8 , 9Figures 10 and 10 are schematic diagrams of the gas-generating component 14. The gas-generating component 14 is typically made of a gas-generating insulating material. In addition to the extension 141, the gas-generating component 14 also includes a covering portion 142, a mounting rib 143, a gas-generating protrusion 144, a stationary contact mating portion 145, and an inclined portion 146. The covering portion 142 is used to cover the grid legs of the grid plate 12, and extends inward from the end of the arc-extinguishing chamber 1 corresponding to the stationary contact. That is, the covering portion 142 extends from the end of the arc-extinguishing chamber 1 corresponding to the stationary contact towards the moving contact 2. The inclined portion 146 is located on the inner surface of the covering portion 142 and is located on the side of the covering portion 142 away from the stationary contact. The central arc-inducing portion 133 extends beyond the pair of inclined portions 146, meaning the central arc-inducing portion 133 and the inclined portions 146 intersect, while the lateral arc-inducing portion 134 is located below the inclined portions 146. Even when the moving arc-inducing plate 13 does not have the lateral arc-inducing portion 134, and the central arc-inducing portion 133 is staggered with the inclined portions 146 on the covering portion 142, it still ensures that the electric arc fully enters the grid plate 12 as designed. The mounting rib 143 extends inward from the side of the covering portion 142 near the grid plate 12 and is fixedly installed with the side plate 11.

[0043] The gas-generating protrusion 144 extends inward from the inner side of the pair of gas-generating elements 14. In an embodiment, the gas-generating protrusion 144 is composed of multiple spaced-apart fins 1441. The fins 1441 are spaced apart to ensure that airflow can pass through the gaps between the fins 1441. Specifically, the number of fins 1441 is six, but it is not limited to this number; for example, it can be two, three, or other numbers. In this embodiment, the fins 1441 are sheet-like, but for the purposes of this invention, the gas-generating protrusion 144 can be other shapes, such as a raised edge, arranged columnar protrusions, or other protrusions that constitute a protruding shape. The pair of gas-generating elements 14 are each provided with the gas-generating protrusion 144. The gas-generating protrusion 144 can be formed separately and then installed on the covering portion 142 of the gas-generating element 14; or it can be integrally formed with the covering portion 142.

[0044] Preferably, the gas-generating protrusion 144 is located only on the covering portion 142. The covering portion 142 has a first inclined surface 1421 that slopes inward in the upward direction. A pair of first inclined surfaces 1421 on a pair of covering portions 142 constitute the bell mouth, and the first inclined surface 1421 is a plane. Specifically, the gas-generating protrusion 144 is located only on the side of the arc-extinguishing chamber 1 facing the stationary contact. More specifically, the gas-generating protrusion 144 corresponds to one end of the stationary contact and extends towards the moving contact 2. The extension length of the gas-generating protrusion 144 is not required; generally, the extension length of the gas-generating protrusion 144 is less than the dimension of the covering portion 142 in the same direction.

[0045] In this embodiment, the flange of the fin 1441 is triangular in shape, preferably a triangle with rounded corners at the top. The flange of the fin 1441 can also be other shapes, such as an arc shape. When the flange of the fin 1441 is triangular, the angle between the lower edge of the fin 1441 and the horizontal line of the arc-extinguishing chamber 1 is α. Figure 10 As shown, the included angle α is greater than or equal to 5º and less than or equal to 35º; preferably, the included angle α is greater than or equal to 10º and less than or equal to 25º, thereby reducing obstruction to airflow.

[0046] This invention provides a gas-generating protrusion 144 on the inner side of the flared opening formed between a pair of gas-generating components 14, so that the electric arc can contact the gas-generating protrusion 144 when it rises. The gas-generating protrusion 144 can absorb the electric arc energy and release insulating gas to accelerate the extinguishing of the electric arc.

Claims

1. An arc-extinguishing device for a switch, comprising an arc-extinguishing chamber (1), said arc-extinguishing chamber (1) comprising a pair of side plates (11), a plurality of grid plates (12) disposed between the pair of side plates (11), and a pair of gas-generating elements (14), wherein the plurality of grid plates (12) are spaced apart from each other, and the pair of gas-generating elements (14) are disposed opposite to each other and form a flared opening that is wider at the bottom and narrower at the top in the upward direction, characterized in that: The gas generating component (14) further includes a gas generating protrusion (144), which is located inside the flared mouth.

2. An arc quenching device for a switch according to claim 1, characterized in that: The gas-generating protrusion (144) includes a plurality of spaced-apart fins (1441).

3. An arc quenching device for a switch according to claim 1, characterized in that: The switch also includes a contact system, which includes a moving contact (2) and a stationary contact; the gas generating component (14) also includes a covering portion (142), which is used to cover the grid legs of the grid plate (12). The covering portion (142) extends from one end of the arc-extinguishing chamber (1) corresponding to the stationary contact to the moving contact (2). The gas generating protrusion (144) is disposed on the covering portion (142). The covering portion (142) has a first inclined surface (1421) that is inclined inward in the upward direction. The pair of first inclined surfaces (1421) on the pair of covering portions (142) constitute the bell mouth.

4. An arc quenching device for a switch according to claim 3, characterized in that: The first inclined surface (1421) is a plane, and the contact piece (21) of the moving contact (2) includes a long contact piece (211) and a short contact piece (212). The arc-drawing head (2111) of the long contact piece (211) is located inside the flared mouth.

5. The arc-extinguishing device for a switch according to claim 2, characterized in that: The gas-generating protrusion (144) includes at least two of the aforementioned fins (1441), and the gas-generating protrusion (144) is integrally formed with the gas-generating component (14).

6. An arc quenching device for a switch according to claim 2, characterized in that: The gas-generating protrusion (144) includes at least two of the aforementioned fins (1441), and the gas-generating protrusion (144) is individually formed and then installed on the gas-generating component (14).

7. An arc quenching device for a switch according to claim 4, characterized in that: The gas generating component (14) also includes an extension (141), a pair of extensions (141) extending toward the contact piece (21), the space between them forming a front cavity, the pair of extensions (141) probing through both ends of the contact piece (21) of the side-by-side moving contact (2).

8. An arc quenching device for a switch according to claim 2, characterized in that: The flange of the fin (1441) is a triangle with rounded corners at the head.

9. The arc-extinguishing device for a switch according to claim 2, characterized in that: The fin (1441) has a lower edge on the side facing the air inlet of the arc-extinguishing chamber (1), and the lower edge is inclined inward in the upward direction.

10. The arc-extinguishing device for a switch according to claim 9, characterized in that: The lower edge is a plane, and the angle between it and the horizontal line of the arc-extinguishing chamber (1) is greater than or equal to 10º and less than or equal to 25º.

Images