Shutter

Abstract

The present invention is provided with: a fixed contact (24b); a movable contact (25b) that comes into contact with and separates from the fixed contact (24b) in accordance with the rotational movement of the rod-shaped movable contact (22b); and a metal grid (26b) disposed so as to face the fixed contact (24b) in a second direction that is orthogonal to a first direction, which is the movement direction of the movable contact (25b), and that is along the longitudinal direction of the movable contact (22b). The grid (26b) returns, to the periphery of the movable contact (25b) and the fixed contact (24b), an air flow that flows from the movable contact (25b) and the fixed contact (24b) toward the grid (26b) in the second direction, said air flow being generated between the movable contact (25b) and the fixed contact (24b) during a pole opening operation in which the fixed contact (24b) and the movable contact (25b) are separated from each other.

Description

Technical Field

[0001] This invention relates to a switch configured between a power source and a load. Background Technology

[0002] Previously, a contact switch was known to have a grid consisting of three sides, forming a metal component that surrounds a movable contact and a fixed contact from three directions. In the grid-based contact switch, electromagnetic force acts on the electric arc generated between the movable and fixed contacts during the opening action (separation of the movable and fixed contacts). The electric arc is attracted from between the movable and fixed contacts to the grid and is cut off due to elongation. As described above, the grid-based contact switch can quickly cut off the electric arc generated during the opening action.

[0003] Patent Document 1 discloses a contact opener / closer with upright left and right return side plates arranged on the inner side of a grid block. In the contact opener / closer disclosed in Patent Document 1, the electric arc is guided into the grid block through the inner side of the left and right return side plates, and the airflow of hot air generated between the movable and fixed contacts is returned to the vicinity of the movable and fixed contacts through the left and right return side plates. The temperature of the hot air generated during the opening operation is lower than that of the electric arc, providing an arc cooling effect. Therefore, by returning the hot air to the vicinity of the movable and fixed contacts, arc extinguishing can be promoted.

[0004] Patent Document 1: Japanese Patent Application Publication No. 56-036815 Summary of the Invention

[0005] In the contact switch disclosed in Patent Document 1, the grid is formed by multiple plate-shaped components, so hot air leaks from the gaps between the plate-shaped components, resulting in a reduced effect on extinguishing the electric arc. Therefore, the contact switch disclosed in Patent Document 1 has the potential to further improve the performance of cutting off the electric arc generated during the opening operation.

[0006] The present invention is made in view of the above circumstances, and its object is to obtain a switch with high performance in cutting off the electric arc generated during the opening operation.

[0007] To address the aforementioned issues and achieve the objective, the opening / closing device of the present invention comprises: a fixed contact; a movable contact disposed on a rotating rod-shaped movable contact member, which contacts and separates from the fixed contact as the movable contact member rotates; and a metal grid configured to face the fixed contact in a second direction, which is orthogonal to the movable direction of the movable contact, i.e., the first direction, and along the long side direction of the movable contact member. The grid causes airflow flowing from the movable contact and the fixed contact toward the grid in the second direction to return to the vicinity of the movable contact and the fixed contact, the airflow being generated between the movable contact and the fixed contact during the opening action when the fixed contact and the movable contact separate.

[0008] The effects of the invention

[0009] According to the present invention, the following effect is achieved: a switch with high performance is obtained that cuts off the electric arc generated during the opening operation. Attached Figure Description

[0010] Figure 1 This is a top view of the opener / closer according to Embodiment 1.

[0011] Figure 2 This is a schematic cross-sectional view of the opener / closer according to Embodiment 1.

[0012] Figure 3 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 1.

[0013] Figure 4 This is a schematic cross-sectional view showing the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 1.

[0014] Figure 5 This is a diagram showing the state in which an electric arc is generated between the movable contact and the fixed contact of the switch according to Embodiment 1.

[0015] Figure 6 This is a perspective view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 2.

[0016] Figure 7 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 2.

[0017] Figure 8 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the first variation of Embodiment 2.

[0018] Figure 9 This is a cross-sectional view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the first modification of Embodiment 2.

[0019] Figure 10This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the second variation of embodiment 2.

[0020] Figure 11 This is a cross-sectional view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the second variation of Embodiment 2.

[0021] Figure 12 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 3.

[0022] Figure 13 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to embodiment 4.

[0023] Figure 14 This is a perspective view of the internal structure of the second phase arc-extinguishing chamber of the switch according to a variation of embodiment 4.

[0024] Figure 15 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to embodiment 5.

[0025] Figure 16 This is a perspective view of the grid of the opener / closer according to embodiment 6.

[0026] Figure 17 This is a perspective view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 7. Detailed Implementation

[0027] Hereinafter, the opening and closing device according to the embodiments will be described in detail based on the accompanying drawings.

[0028] Implementation Method 1

[0029] Figure 1 This is a top view of the opening / closing device according to Embodiment 1. Figure 2 This is a schematic diagram showing a cross-section of the opener / closer according to Embodiment 1. Figure 2 The edge of the switch 1 is schematically shown. Figure 1 The cross-section of line II-II in the diagram. For example... Figure 1 as well as Figure 2As shown, the Y, Z, and X directions are defined as mutually orthogonal directions. Specifically, the first direction is defined as the Z direction, the second direction as the Y direction, and the third direction as the X direction. The first direction is the direction in which the movable contact 25b contacts and separates from the fixed contact 24b, as described later, and is the movable direction of the movable contact 25b. The second direction is orthogonal to the Z direction and is the direction along the long side of the movable contact 22b, as described later. The third direction is orthogonal to both the Z and Y directions and is the direction along the short side of the movable contact 22b, as described later. Furthermore, the Z direction is a general term for the +Z and -Z directions, which are opposite to each other; the Y direction is a general term for the +Y and -Y directions, which are opposite to each other; and the X direction is a general term for the +X and -X directions, which are opposite to each other. Furthermore, in the following description, the examples are those in which +Z direction corresponds to the up direction, -Z direction corresponds to the down direction, +Y direction corresponds to the forward direction, -Y direction corresponds to the backward direction, +X direction corresponds to the left direction, and -X direction corresponds to the right direction. However, this example does not limit the setting posture of the opener / closer 1.

[0030] The switch 1 is, for example, a contact switch configured for a three-phase power supply, having three arc-suppression chambers. Each phase of the switch 1 has the same construction, so only the construction of one phase will be described below, and the other phases, which are omitted from repeated descriptions, also have the same construction.

[0031] like Figure 1 as well as Figure 2 As shown, the switch 1 has: a contact section 1A having a first phase arc suppression chamber 21a, a second phase arc suppression chamber 21b and a third phase arc suppression chamber 21c adjacent to each other; a switching mechanism section 1B that drives the contact section 1A; and a relay section 1C that activates the switching mechanism section 1B when an overcurrent is detected.

[0032] The wiring of one phase of the three-phase power supply (not shown) is connected to fixed contacts 23a, 23b, and 23c via power supply side terminals 231a, 231b, and 231c, respectively. The wiring of the load (not shown) is connected to fixed terminals 23d, 23e, and 23f via load side terminals 231d, 231e, and 231f, respectively. The first-phase arc-suppression chamber 21a, the second-phase arc-suppression chamber 21b, and the third-phase arc-suppression chamber 21c have the same structure. Therefore, the following mainly describes the structure of the second-phase arc-suppression chamber 21b, and omits repeated descriptions of the structures of the first-phase arc-suppression chamber 21a and the third-phase arc-suppression chamber 21c.

[0033] Figure 3 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 1. Figure 4This is a schematic cross-sectional view showing the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 1. Figure 4 The internal structure of the second-phase arc-extinguishing chamber 21b is shown along the [path]. Figure 3 The cross-sectional structure of line IV-IV in the image. Furthermore, Figure 3 as well as Figure 4 For the power supply side of one phase of the three-phase power supply, the positional relationship between the movable contact 22b with movable contact 25b, the fixed contact 23b with fixed contact 24b, the grid 26b disposed nearby, and the two insulating parts 271b and 272b is shown. The power supply sides of the other two phases have the same structure, so repeated descriptions are omitted here.

[0034] The second phase arc suppression chamber 21b includes: a fixed contact 23b with a fixed contact 24b; a movable contact 22b with a movable contact 25b; a grid 26b disposed near the fixed contact 24b and the movable contact 25b; and two insulating components 271b and 272b disposed near the grid 26b.

[0035] The grid 26b is formed of a magnetic material such as iron. Upon detection of an emergency current, the movable contact 25b separates from the fixed contact 24b, thereby simultaneously generating an electric arc and hot gas from either the movable or fixed contact 25b towards the +Y direction. The grid 26b forms a flow path that guides the hot gas from the movable or fixed contact 25b towards the front towards the movable or fixed contact 24b in both the ±X and -Y directions. In other words, the grid 26b has the function of reversing the flow direction of the hot gas.

[0036] Additionally, grid 26b, such as Figure 3 as well as Figure 4 As shown, the movable contact 22b is arranged along its long side extension, and has multiple surfaces surrounding the fixed contact 24b. More specifically, as... Figure 3 As shown, the grid 26b has two opposing side portions 261b and 262b covering the fixed contact 24b, and a connecting portion 263b connecting them, and is U-shaped in plan view. The side portions 261b and 262b sandwich the fixed contact 24b in the X direction, which is orthogonal to the movable direction (Z direction) of the movable contact 22b. The connecting portion 263b is opposite to the fixed contact 24b in the Y direction, which is orthogonal to the movable direction (Z direction). In addition, the dimension of the connecting portion 263b in the movable direction (Z direction) of the movable contact 22b is greater than or equal to the dimension in the Y direction. Furthermore, as... Figure 3 as well as Figure 4As shown, when the movable contact 25b is located near the fixed contact 24b, the movable contact 25b and the fixed contact 24b are covered together by two side portions 261b, 262b and a connecting portion 263b.

[0037] Two insulating components 271b and 272b are disposed inside the grid 26b between the fixed contact 24b and the grid 26b, such that at least a portion of the connecting portion 263b of the grid 26b is exposed when viewed from the fixed contact 24b. Furthermore, the inside of the grid 26b refers to the area formed by the connecting portion 263b and the two side portions 261b and 262b surrounding it. Here, it is not necessary to provide both insulating components 271b and 272b; providing at least one is sufficient.

[0038] When an emergency current is detected, the hot air flowing from the movable contact 25b and the fixed contact 24b in the +Y direction, upon encountering the connecting portion 263b, changes its direction of travel to the ±X direction, and further changes its direction of travel to the -Y direction along the side portions 261b, 262b and the insulating components 271b, 272b. Therefore, the hot air generated between the movable contact 25b and the fixed contact 24b returns to the vicinity of the movable contact 25b and the fixed contact 24b through the grid 26b.

[0039] The movable contact 22b is driven by the opening and closing mechanism 1B, so as to Figure 4 The drive shaft 221b shown rotates around the drive shaft 221b. Specifically, when energized, the opening / closing mechanism 1B causes the movable contact 22b to rotate around the drive shaft 221b until the movable contact 25b contacts the fixed contact 24b. Furthermore, if an emergency current is detected, the relay 1C actuates the opening / closing mechanism 1B, causing the movable contact 22b to rotate around the drive shaft 221b in the direction that the movable contact 25b separates from the fixed contact 24b.

[0040] If, upon detecting an overcurrent, the relay unit 1C activates the switching mechanism unit 1B, causing the movable contact 25b to separate from the fixed contact 24b, an electric arc is generated between the movable contact 25b and the fixed contact 24b. The process of interrupting the electric arc generated between the movable contact 25b and the fixed contact 24b will be explained. Figure 5This diagram illustrates the state in which an electric arc is generated between the movable and fixed contacts of the switch according to Embodiment 1. Immediately after the movable contact 25b separates from the fixed contact 24b, an electric arc connecting the movable contact 25b and the fixed contact 24b is generated at position A1. The grid 26b applies electromagnetic force to the arc in the +Y direction. Furthermore, the airflow of hot gas generated between the movable contact 25b and the fixed contact 24b in the +Y direction also drives the arc. As a result, the arc, which passes between the insulating members 271b and 272b and is pulled to the connecting portion 263b of the grid 26b, moves to position A2. If the arc attracted by the grid 26b contacts the connecting portion 263b, current flows into the grid 26b, and the arc moves to positions A3 and A4 where it is cut off. Since the arc is cut off, the arc generated between the movable contact 25b and the fixed contact 24b is interrupted.

[0041] In addition to driving the electric arc generated between the movable contact 25b and the fixed contact 24b in the +Y direction toward the grid 26b by electromagnetic force, the switch 1 according to Embodiment 1 also drives the electric arc generated between the movable contact 25b and the fixed contact 24b in the +Y direction by the airflow of hot gas generated between the movable contact 25b and the fixed contact 24b. Furthermore, the switch 1 according to Embodiment 1 increases the driving force of the electric arc and improves the cooling effect of the electric arc by causing the airflow of hot gas, which has changed direction at the connecting portion 263b, to flow along the side portions 261b and 262b of the grid 26b in the -Y direction. Therefore, the switch 1 according to Embodiment 1 can quickly stretch the electric arc to the grid 26b and cut it off, thus enabling faster arc cutting.

[0042] In addition, such as Figure 3 and Figure 4 As shown, the switch 1 according to Embodiment 1 has a grid 26b. The size of the grid 26b in the working direction (Z direction) of the movable contact 22b is greater than or equal to the size in the arrangement direction (Y direction) of the fixed contact 24b and the connecting portion 263b, and the number of faces is greater than or equal to 3. Therefore, the magnet volume can be increased, and the electromagnetic force acting on the arc can be strengthened. Thus, the switch 1 according to Embodiment 1 can quickly cut off the arc by rapidly stretching it. In addition, the switch 1 according to Embodiment 1 has insulating members 271b and 272b disposed inside the grid 26b, so the arc will not contact the side portions 261b and 262b of the grid 26b, and the arc can be moved to at least a portion of the exposed connecting portion 263b, thus reliably cutting off the arc.

[0043] Implementation Method 2

[0044] Figure 6This is a perspective view of the internal structure of the second phase arc-extinguishing chamber of the switch according to Embodiment 2. Figure 7 This is a top view of the internal structure of the second-phase arc-suppression chamber of the switch according to Embodiment 2. The switch 1 according to Embodiment 2 differs from the switch 1 according to Embodiment 1 in that a gap 91 is formed between each of the insulating members 271b and 272b and the grid 26b. The switch 1 according to Embodiment 2 has a return path X1 formed between the insulating members 271b and 272b, a return path X2 formed by the gap 91 between the side portion 261b and the insulating member 271b, and a return path X3 formed by the gap 91 between the side portion 262b and the insulating member 272b.

[0045] When the contacts are open, a portion of the hot air generated between the movable contact 25b and the fixed contact 24b, along with the electric arc, flows from the movable contact 25b and the fixed contact 24b toward the grid 26b in the +Y direction. The hot air that collides with the connecting portion 263b branches in the ±X direction, which is orthogonal to the movable direction (Z direction) of the movable contact 22b. The hot air flows along the inner surface of the grid 26b in the -Y direction, opposite to the hot air in the return path X1, through the return path X2 and the return path X3.

[0046] Because gaps 91 are formed between the insulating members 271b and 272b and the grid 26b, the spacing between the insulating members 271b and 272b is narrower than that of the opener / closer 1 according to Embodiment 1. Therefore, the airflow of hot gas flowing in the +Y direction through the return path X1 formed between the insulating members 271b and 272b is stronger than that of the opener / closer 1 according to Embodiment 1. In addition, return paths X2 and X3 are formed between the insulating members 271b and 272b and the side portions 261b and 262b, so the airflow of hot gas flowing in the -Y direction along the side portions 261b and 262b and the insulating members 271b and 272b is stronger than that of the opener / closer 1 according to Embodiment 1. Furthermore, since the return path X1 and the return paths X2 and X3 are separated by the insulating members 271b and 272b, the hot gas flowing in the +Y direction and the hot gas flowing in the -Y direction do not interfere with each other and weaken each other.

[0047] Figure 8 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the first variation of Embodiment 2. Figure 9 This is a cross-sectional view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the first modification of Embodiment 2. Figure 9 The internal structure of the second-phase arc-extinguishing chamber 21b is shown along the [path]. Figure 8The cross-section of line IX-IX in the diagram. The insulating components 271b and 272b of the switch 1 according to the first modification of Embodiment 2 have lower portions 31b and 32b, which are portions opposite to the side portions 261b and 262b and are lower than the side portions 261b and 262b. The distance between the lower portions 31b and 32b in the first direction and the fixed contact 24b is less than the distance between the ends of the side portions 261b and 262b in the first direction and the fixed contact 24b. In the switch 1 according to the first modification of Embodiment 2, the space above the lower portions 31b and 32b becomes a gap 91, forming return paths X2 and X3.

[0048] Figure 10 This is a top view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the second variation of embodiment 2. Figure 11 This is a cross-sectional view of the internal structure of the second phase arc-extinguishing chamber of the switch according to the second variation of Embodiment 2. Figure 11 The second phase arc-extinguishing chamber 21b is shown along... Figure 10 The cross-section of the XI-XI line. In the second variation of Embodiment 2, the switch 1 has grooves 33b and 34b extending in the Y direction formed in the insulating components 271b and 272b, respectively. In the switch 1 of the second variation of Embodiment 2, the internal space of the grooves 33b and 34b becomes a gap 91 to form return paths X2 and X3.

[0049] As described above, the return paths X2 and X3 can be separated from the return path X1 as long as they are formed by the side surface 261b or side surface 262b of the grid 26b and at least any part of the insulating component 271b or insulating component 272b.

[0050] The switch 1 according to Embodiment 2 has a return path X1 and return paths X2 and X3. The airflow of hot gas generated between the movable contact 25b and the fixed contact 24b flows through the return path X1 in the +Y direction, and the airflow of hot gas whose direction is changed by the connecting part 263b flows through the return paths X2 and X3 in the -Y direction. Therefore, the airflow of hot gas generated between the movable contact 25b and the fixed contact 24b and the airflow of hot gas returning to the vicinity of the movable contact 25b and the fixed contact 24b can be enhanced, and mutual weakening can be suppressed. Therefore, in addition to the same effect as the switch 1 according to Embodiment 1, the switch 1 according to Embodiment 2 can also complete the arc cutting off at a higher speed by rapidly stretching the arc to the grid 26b and cutting it off.

[0051] Furthermore, the hot air does not necessarily have to branch in the ±X direction at the connection 263b. Therefore, the same effect can be obtained even if the hot air flow is made to flow in at least one of the return path X2 and the return path X3.

[0052] Implementation Method 3

[0053] Figure 12 This is a top view of the internal structure of the second phase arc suppression chamber of the switch according to Embodiment 3. The switch 1 according to Embodiment 3 differs from the switch 1 according to Embodiment 2 in that the insulating members 271b and 272b are arranged such that the wall surfaces 291b and 292b opposite to the fixed contact 24b are inclined relative to the side portions 261b and 262b of the grid 26b.

[0054] like Figure 12 As shown, in Embodiment 3, the insulating member 271b is arranged such that the wall surface 291b and the side surface 261b form an angle θ on the XY plane, and similarly, the insulating member 272b is arranged such that the wall surface 292b and the side surface 262b form an angle θ' on the XY plane. Here, the angles θ and θ' do not necessarily have to be the same size.

[0055] Furthermore, similar to the opening / closing device 1 involved in the variation of Embodiment 2, it is also possible to provide an insulating component 271b, 272b with a lower portion 31b, 32b.

[0056] In Embodiment 3, the insulating components 271b and 272b of the switch 1, whose wall surfaces 291b and 292b are opposite to the fixed contact 24b, are inclined relative to the side portions 261b and 262b of the grid 26b. The closer the insulating components 271b and 272b are to the connecting portion 263b along the Y direction, the closer they are to the movable contact 25b and the fixed contact 24b, thus increasing the flow velocity of the hot air flowing through the return path X1. Therefore, the switch 1 according to Embodiment 3, by enhancing the force of the hot air flow to drive the arc, rapidly stretches the arc to the grid 26b and cuts it off, thereby enabling arc cutting to be completed at a higher speed.

[0057] Implementation Method 4

[0058] Figure 13 This is a top view of the internal structure of the second-phase arc-suppression chamber of the switch according to Embodiment 4. In the switch 1 according to Embodiment 4, the insulating components 271b and 272b are configured such that the area of ​​the gas outlet surface a in the return paths X2 and X3 is smaller than the area of ​​the gas inflow surface b from the return path X1 to the return paths X2 and X3. Here, the areas of the gas outlet surface a and the gas inflow surface b in each of the return paths X2 and X3 do not necessarily have to be the same; it is sufficient that the area of ​​the gas outlet surface a < the area of ​​the gas inflow surface b in each of the return paths X2 and X3.

[0059] Figure 14This is a perspective view of the internal structure of the second-phase arc-extinguishing chamber of the switch according to a variation of embodiment 4. Figure 14 The illustration of grid 26b is omitted. In the variation of embodiment 4, the insulating member 271b of the opener 1 is similar to that of the second variation of embodiment 2, in that a return path X2 is formed by creating a gap 91 inside the groove 33b extending in the first direction formed in the insulating member 271b. In the opener 1 of the variation of embodiment 4, the cross-sectional area of ​​the groove 33b is larger closer to the connecting portion 263b. Although in Figure 14 Not shown in the figure, but similar to the insulating member 272b of the switch 1 in the second variation of Embodiment 2, the insulating member 272b has a groove 34b that is the same as the groove 33b of the insulating member 271b, and the interior of the groove 34b forms a gap 91 to form a return path X3. Therefore, in the switch 1 in the variation of Embodiment 4, the area of ​​the gas outflow surface a from the return paths X2 and X3 is smaller than the area of ​​the gas inflow surface b from the return path X1 to the return paths X2 and X3.

[0060] Furthermore, similar to the opening / closing device 1 according to the first modification of Embodiment 2, it is also possible to configure the insulating components 271b and 272b to have a lower portion 31b and 32b. In the configuration where the insulating components 271b and 272b have a lower portion 31b and 32b, it is possible to configure the structure as follows: the height of the lower portions 31b and 32b is lower as it approaches the connecting portion 263b along the Y direction, so that the area of ​​the gas outflow surface a of the return paths X2 and X3 is smaller than the area of ​​the gas inflow surface b from the return path X1 to the return paths X2 and X3. Alternatively, the structure can be configured as follows: the height difference between the side portions 261b, 262b of the grid 26b and the bottom portions 31b, 32b of the insulating components 271b, 272b increases as it approaches the connecting portion 263b along the Y direction, thus the area of ​​the gas outlet surface a of the return paths X2, X3 is smaller than the area of ​​the gas inflow surface b from the return path X1 to the return paths X2, X3. Alternatively, the structure can be configured as follows: the dimension of the return paths X2, X3 in the X direction increases as it approaches the connecting portion 263b along the Y direction, thus the area of ​​the gas outlet surface a of the return paths X2, X3 is smaller than the area of ​​the gas inflow surface b from the return path X1 to the return paths X2, X3.

[0061] In Embodiment 4, the area of ​​the gas outlet surface a in the return paths X2 and X3 of the switch 1 is smaller than the area of ​​the gas inflow surface b. The return paths X2 and X3 are narrowed in the flow direction, thus increasing the flow velocity reaching the movable contact 25b and the fixed contact 24b. Therefore, compared to the switch 1 in Embodiments 1 to 3, the switch 1 in Embodiment 4 further improves the arc cooling effect and can more reliably cut off the arc.

[0062] Implementation Method 5

[0063] Figure 15 This is a top view of the internal structure of the second-phase arc-extinguishing chamber of the switch according to Embodiment 5. The switch 1 according to Embodiment 5 differs from the switch 1 according to Embodiment 4 in that it includes air-blowing components 281b and 282b. The air-blowing components 281b and 282b are disposed adjacent to the ends of the side portions 261b and 262b opposite to the connecting portion 263b. The surfaces of the air-blowing components 281b and 282b opposite to the fixed contact 24b are curved surfaces that are closer to the fixed contact 24b the further away from the connecting portion 263b.

[0064] By providing the air blowing components 281b and 282b on the gas outflow surface a side of the return paths X2 and X3, a return path X4 is formed in the space between the insulating component 271b and the air blowing component 281b, and a return path X5 is formed in the space between the insulating component 272b and the air blowing component 282b.

[0065] When the contacts are open, a portion of the hot air generated between the movable contact 25b and the fixed contact 24b, along with the electric arc, flows from either the movable contact 25b or the fixed contact 24b toward the grid 26b. The hot air colliding with the connecting portion 263b branches in the ±X directions, which are orthogonal to the movable direction (Z direction) of the movable contact 22b. The hot air flows along the inner surface of the grid 26b in the -Y direction, opposite to the airflow of the hot air in the return path X1, through the return paths X2 and X3. The hot air flowing through the return paths X2 and X3 is redirected by the blowing components 281b and 282b, and the airflow of the hot air flows toward the movable contact 25b and the fixed contact 24b in the return paths X4 and X5, respectively, and the hot air is blown to the movable contact 25b and the fixed contact 24b.

[0066] The switch 1 according to embodiment 5 can efficiently blow hot air to the movable contact 25b and the fixed contact 24b, thus improving the arc cooling effect and enabling more reliable arc cutting.

[0067] Implementation Method 6

[0068] The difference between the opener / closer 1 in Embodiment 6 and the opener / closer 1 in Embodiment 2 is that the structure of the grid 26b is different. Figure 16 This is a perspective view of the grid of the opener / closer according to Embodiment 6. The opener / closer 1 according to Embodiment 6 has at least one through hole 264b provided on at least one of the side portions 261b and 262b of the grid 26b, and the inner space and outer space of the grid 26b are connected via the through hole 264b. Otherwise, it is the same as the opener / closer 1 according to Embodiment 2.

[0069] By providing at least one through hole 264b on at least one of the side portions 261b and 262b, a portion of the hot air flowing through the return paths X2 and X3 is discharged outside the return paths X2 and X3 through the through hole 264b.

[0070] If the airflow of hot gas is obstructed in return paths X2 and X3, the inflow of hot gas from return path X1 will also be obstructed, weakening the arc drive generated by the hot gas flowing in the +Y direction through return path X1. Furthermore, since the inflow of airflow from return path X1 to return paths X2 and X3 is obstructed, the airflow returning to the vicinity of the fixed contact 24b and the movable contact 25b is reduced. The switch 1 according to embodiment 6 can appropriately discharge the hot gas flowing through return paths X2 and X3 outside of return paths X2 and X3, so that the hot gas does not stagnate within return paths X2 and X3, but instead flows back to the vicinity of the movable contact 25b and the fixed contact 24b. Therefore, in addition to the effects of the switch 1 involved in embodiments 1 to 5, the switch 1 involved in embodiment 6 can also improve the return flow efficiency and can more reliably complete the cutting off of the electric arc. The return flow efficiency represents the ratio of the hot air generated between the movable contact 25b and the fixed contact 24b to the hot air around the movable contact 25b and the fixed contact 24b.

[0071] Implementation Method 7

[0072] The difference between the opener / closer 1 in Embodiment 7 and the opener / closer 1 in Embodiment 3 is that the structure of the grid 26b is different. Figure 17 This is a perspective view of the internal structure of the second-phase arc-suppression chamber of the switch according to Embodiment 7. In the switch 1 according to Embodiment 7, a plurality of grids 26b are stacked in the movable direction of the movable contact 22b. Here, the grids 26b in each layer are not electrically connected to each other. The rest is the same as the internal structure of the second-phase arc-suppression chamber 21b of the switch 1 according to Embodiment 5.

[0073] Similar to Embodiment 1, the electric arc generated between the movable contact 25b and the fixed contact 24b is drawn to the stacked grids 26b, and the movable contact 25b and the fixed contact 24b are connected with the connecting portion 263b of any one of the grids 26b as the middle. Then, the grids 26b are electrically connected, and the electric arc is cut off through the grids 26b with the movable contact 22b and the fixed contact 23b as the two ends.

[0074] Regarding the switch 1 according to embodiment 7, as long as the arc is pulled into any one of the multiple grids 26b, the pulled arc can be cut off by the multiple grids 26b, thus increasing the arc voltage and enabling more reliable arc cutting.

[0075] Furthermore, while embodiments 1 to 7 describe contact openers with one pair of contacts per phase, the same implementation is possible for contact openers with multiple pairs of contacts per phase, and their application is not limited.

[0076] The structure shown in the above embodiments is an example of the content and can be combined with other known technologies. Parts of the structure can be omitted or changed without departing from the main idea.

[0077] Explanation of the label

[0078] 1. Switch, 1A. Contact section, 1B. Switching mechanism section, 1C. Relay section, 21a. First phase arc suppression chamber, 21b. Second phase arc suppression chamber, 21c. Third phase arc suppression chamber, 22b. Movable contact, 23a, 23b, 23c. Fixed contact, 23d, 23e, 23f. Fixed terminal, 24b. Fixed contact, 25b. Movable contact, 26b. Grid, 31b, 32b. Bottom section, 33b, 34b. Slot, 91. Gap, 221b. Drive shaft, 231a, 231b, 231c. Power supply side terminal, 231d, 231e, 231f. Load side terminal, 261b, 262b. Side section, 263b. Connecting part, 264b. Through hole, 271b, 272b. Insulating component, 281b, 282b. Air blowing components, 291b, 292b wall surfaces.

Claims

1. An opening / closing device, characterized in that, have: Fixed contacts; A movable contact is disposed on a rotating rod-shaped movable contact member, and contacts and separates from the fixed contact member as the movable contact member rotates and moves. as well as A metal grid is configured to face the fixed contact in a second direction, which is orthogonal to the movable direction of the movable contact (i.e., the first direction) and runs along the long side of the movable contact. The grid causes the airflow flowing from the movable contact and the fixed contact toward the grid along the second direction to return to the vicinity of the movable contact and the fixed contact, the airflow being generated between the movable contact and the fixed contact during the opening action when the fixed contact separates from the movable contact.

2. The opening / closing device according to claim 1, characterized in that, The switch has at least one insulating component disposed between the grid and the fixed contact. The grid has a connecting portion and two side portions. The two side portions face each other in a third direction, which is orthogonal to both the first and second directions, and sandwich the movable contact. The connecting portion faces the fixed contact in the second direction, connecting the two side portions together. The insulating component is disposed between at least one of the two side faces and the fixed contact, such that at least a portion of the connecting portion of the grid is exposed when viewed from the position of the fixed contact. The dimension of the connecting portion in the first direction is greater than or equal to the dimension in the second direction.

3. The opening / closing device according to claim 2, characterized in that, A gap is formed between the insulating component and the side portion opposite to the insulating component.

4. The opening / closing device according to claim 3, characterized in that, The gap forms a return path, through which the airflow flows in the second direction in a direction opposite to that from the fixed contact towards the connecting portion. The cross-sectional area of ​​the gap at the end near the connecting portion in the second direction is greater than the cross-sectional area at the end away from the connecting portion.

5. The opening / closing device according to claim 3 or 4, characterized in that, The insulating member has a low portion, and the gap is formed above the low portion. The low portion is a part in the first direction where the distance from the fixed contact is less than the distance between the end of the side portion in the first direction and the fixed contact.

6. The opening / closing device according to claim 5, characterized in that, The greater the height difference between the lower part and the end face of the insulating component in the first direction, the closer it is to the connecting part along the second direction.

7. The opening / closing device according to claim 5, characterized in that, The dimension of the insulating component at the lower part in the first direction increases as it approaches the connecting portion along the second direction.

8. The opening / closing device according to claim 3 or 4, characterized in that, The insulating component has a groove extending in the second direction on the surface opposite to the side portion, and the space inside the groove forms the gap.

9. The opening / closing device according to claim 8, characterized in that, The size of the gap in the first direction increases as it approaches the connecting portion along the second direction.

10. The opening / closing device according to any one of claims 2 to 9, characterized in that, The insulating component is configured such that the closer the wall surface opposite the fixed contact is to the connecting portion along the second direction, the closer it is to the fixed contact in the third direction.

11. The opening / closing device according to any one of claims 2 to 10, characterized in that, The grid has an air blowing component that redirects the airflow along the side surface to the fixed contact.

12. The opening / closing device according to any one of claims 2 to 11, characterized in that, The grid has a through hole formed on the side portion, which connects the space surrounded by the connecting portion and the side portion to the outside of the space.

13. The opening / closing device according to any one of claims 1 to 12, characterized in that, The grid is arranged in multiple ways along the first direction.

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