Opener

Abstract

The switch comprises: a first fixed contact (3) having a first fixed contact point; a second fixed contact (5) arranged separately from the first fixed contact (3) and having a second fixed contact point (6); a movable contact (9) having a first movable contact point capable of contacting or separating with the first fixed contact point arranged at one end in the length direction, and a second movable contact point (8) capable of contacting or separating with the second fixed contact point (6) arranged at the other end in the length direction; a first magnet pair (11) formed by placing a first movable contact point (11) at a width of the movable contact (9) and a second movable contact point (8) arranged at a width of the movable contact (9). The invention relates to a first movable contact point (6) and a second movable contact point (8) comprising a pair of magnets (10) with the same polarity on the surfaces opposite to each other in the width direction, and arranged with the middle point side of the first movable contact point (8) close to the movable contact piece (9) and extending outwardly, separating the first fixed contact point and the first movable contact point; and a second magnet pair (12), which comprises a pair of magnets (10) with the same polarity on the surfaces opposite to each other in the width direction, and arranged with the middle point side of the first movable contact point (8) close to the movable contact piece (9) and extending outwardly, separating the second fixed contact point (6) and the second movable contact point (8).

Description

Technical Field

[0001] The present invention relates to a switch that forms a magnetic field near a contact point between a movable contact and a fixed contact. Background Art

[0002] The following is disclosed, that is, in a switch that separates / contacts a fixed contact of a fixed contact piece and a movable contact of a movable contact piece, an arc may be generated when these contacts are disconnected. A permanent magnet that generates a magnetic field is provided near the contact that generates the arc, and the arc is driven and stretched by the Lorentz force, thereby improving the arc extinguishing performance of the switch (for example, refer to Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2012-160427 Summary of the invention

[0004] However, when increasing the magnetic flux density near the contact point to increase the driving force for extending the arc, the permanent magnet needs to be brought close to the contact point, which causes a problem that the arc extinguishing space cannot be ensured.

[0005] The present invention is proposed to solve the above-mentioned problems, and its purpose is to provide a switch that can increase the driving force acting on the arc, ensure arc extinguishing space in the direction of arc extension, and improve arc extinguishing performance.

[0006] The switch according to the present invention comprises: a first fixed contact having a first fixed contact; a second fixed contact arranged to be separated from the first fixed contact and having a second fixed contact; a movable contact, wherein the first movable contact capable of contacting or separating with the first fixed contact is arranged at one end in the length direction, and the second movable contact capable of contacting or separating with the second fixed contact is arranged at the other end in the length direction; a first magnet pair, which is composed of a pair of magnets whose faces facing each other in the width direction of the movable contact are set to have the same polarity, and is arranged in such a manner that the middle point side of the first movable contact and the second movable contact is close to the movable contact and expands outwardly, sandwiching the first fixed contact and the first movable contact; and a second magnet pair, which is composed of a pair of magnets whose faces facing each other in the width direction are set to have the same polarity, and is arranged in such a manner that the middle point side is close to the movable contact and expands outwardly, sandwiching the second fixed contact and the second movable contact.

[0007] Effects of the Invention

[0008] According to the present invention, the driving force acting on the arc can be increased, and the arc extinguishing space can be ensured in the direction in which the arc extends, so that the arc extinguishing performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a top view of the switch according to Embodiment 1.

[0010] Figure 2 It is a perspective view showing the arc extinguishing chamber structure of the switch according to the first embodiment.

[0011] Figure 3 It is a side view showing the arc extinguishing chamber structure of the switch according to the first embodiment.

[0012] Figure 4 It is a top view showing the arc extinguishing chamber structure of the switch according to the first embodiment.

[0013] Figure 5 This is a schematic diagram schematically showing a magnetic field generated in the arc extinguishing chamber of the switch according to the first embodiment.

[0014] Figure 6 This is a schematic diagram schematically showing the magnetic field involved in the first embodiment.

[0015] Figure 7 This is a schematic diagram schematically showing the magnetic field involved in the first embodiment.

[0016] Figure 8 It is a perspective view showing the arc extinguishing chamber structure of the switch involved in the second embodiment.

[0017] Fig. 9 It is a top view showing the arc extinguishing chamber structure of the switch according to the second embodiment.

[0018] Fig.10 This is a schematic diagram schematically showing a magnetic field generated in an arc extinguishing chamber of a switch according to the second embodiment.

[0019] Fig.11 It is a perspective view showing the arc extinguishing chamber structure of the switch involved in the third embodiment.

[0020] Fig.12 It is a top view showing the arc extinguishing chamber structure of the switch according to the third embodiment.

[0021] Fig.13 This is a schematic diagram schematically showing a magnetic field generated in an arc extinguishing chamber of a switch according to the third embodiment.

[0022] Fig.14 It is a perspective view showing the arc extinguishing chamber structure of the switch involved in the fourth embodiment.

[0023] Fig.15 It is a top view showing the arc extinguishing chamber structure of the switch involved in the fourth embodiment.

[0024] Fig.16 It is a perspective view showing the arc extinguishing chamber structure of the switch involved in the fifth embodiment.

[0025] Fig.17 It is a top view showing the arc extinguishing chamber structure of the switch involved in the fifth embodiment.

[0026] Fig.18 It is a perspective view showing the arc extinguishing chamber structure of the switch involved in the sixth embodiment.

[0027] Fig.19 It is a top view showing the arc extinguishing chamber structure of the switch involved in the sixth embodiment.

[0028] Fig. 20 It is a partial cross-sectional view showing the arc extinguishing chamber structure of the switch involved in the seventh embodiment.

[0029] Fig.21 It is a partial cross-sectional view showing the arc extinguishing chamber structure of the switch involved in the eighth embodiment.

[0030] Fig. 22 It is a cross-sectional view showing an example of a state of arc discharge in a switch when no insulating plate is provided.

[0031] Fig.23 It is a cross-sectional view showing an example of a state of arc discharge in a switch when no insulating plate is provided.

[0032] Fig.24 This is a conceptual diagram for explaining the effect of the switch according to the eighth embodiment.

[0033] Fig.25 It is a partial cross-sectional view showing the arc extinguishing chamber structure of the switch involved in the ninth embodiment. DETAILED DESCRIPTION

[0034] Implementation method 1.

[0035] Next, Embodiment 1 will be described based on the drawings.

[0036] Figure 1 1 is a top view showing the appearance of the switch 1 according to Embodiment 1. The switch 1 of the present invention is, for example, an electromagnetic contactor, and performs switching of a circuit connected to the switch 1. The switch 1 has an arc extinguishing chamber 2 surrounded by an arc extinguishing housing. In addition, the arc extinguishing chamber 2 of the switch 1 is divided into a first phase and a second phase, and has the same structure as each other.

[0037] Figure 2 and Figure 3The switch 1 according to the first embodiment comprises: a first fixed contact 3 having a first fixed contact point 4; a second fixed contact 5 arranged away from the first fixed contact 3 and having a second fixed contact point 6; a movable contact 9 having a first fixed contact point 4 and a second fixed contact point 6; and a second fixed contact 9 having a first fixed contact point 4 and a second fixed contact point 6. Figure 2 The ends of the movable contact 9 (in the y-axis direction) have a first movable contact 7 and a second movable contact 8 that can contact or separate with the first fixed contact 4 and the second fixed contact 6; and a first magnet pair 11 and a second magnet pair 12, which are arranged in the width direction ( Figure 2 The movable contact member 9 is arranged at an angle relative to the x-axis direction in FIG. 1 , and each of the movable contact members 9 is composed of a pair of magnets 10.

[0038] The first fixed contact 3 is, for example, substantially in the shape of a rectangular parallelepiped, and has a main surface ( Figure 3 The first fixed contact 4 is provided on the surface of the positive z-axis direction in the z-axis direction. In addition, the second fixed contact 5 is similar to the first fixed contact 3, for example, in the shape of a substantially rectangular parallelepiped, and has a second fixed contact 6 on the main surface. The first fixed contact 3 and the second fixed contact 5 have the same shape as each other, are separated and arranged, and the directions of the currents flowing are opposite to each other. Here, Figure 3 In the example of FIG. 5 , the fixed contacts are separated and arranged in the y-axis direction so as to be electrically insulated, and the first fixed contact 3 is arranged on the positive side of the y-axis direction relative to the second fixed contact 5 .

[0039] When the first fixed contact 3 and the second fixed contact 5 are electrically connected via the movable contact 9 due to the operation of the movable contact 9, current flows and connects with other devices connected to each fixed contact to form a circuit. For example, the first fixed contact 3 is connected to a power source, and the second fixed contact 5 is connected to a load such as a motor.

[0040] For example, when the movable contact 9 is viewed from the upper surface (towards Figure 3 The first fixed contact 4 and the second fixed contact 6 and the first movable contact 7 and the second movable contact 8 that can be contacted or separated are respectively arranged at the ends in the length direction. Here, the first fixed contact 4 and the first movable contact 7 are arranged opposite to each other, and similarly, the second fixed contact 6 and the second movable contact 8 are arranged opposite to each other. That is, the first movable contact 7 is arranged on the side where the first fixed contact 4 is arranged, and the second movable contact 8 is arranged on the side where the second fixed contact 6 is arranged on the opposite side to the side where the first movable contact 7 is arranged.

[0041] The movable contact 9 is connected to a drive device (not shown) using an electromagnet or the like, and can be moved in the vertical direction ( Figure 3The movable contact 9 moves in the z-axis direction in the vertical direction, and the movable contact points and the fixed contact points are brought into contact or separated by the contact or separation action caused by the movement of the movable contact 9 in the vertical direction. Each contact member and each contact point has conductivity, for example, each contact member is copper or a copper alloy, and each contact point is made of silver or an alloy with silver as a base material.

[0042] If the contacts are separated from the state where the movable contacts and the fixed contacts are in contact with each other and current flows, a high-temperature arc is generated between the contacts according to the circuit conditions. The arc is conductive and current flows, so the arc needs to be extinguished in order to cut off the circuit. By immediately extinguishing the arc, the circuit current is completely cut off, and current can be prevented from flowing in the load connected to the switch 1.

[0043] Next, use Figure 4 The first magnet pair 11 and the second magnet pair 12 of the switch 1 are described. The first magnet pair 11 is configured by setting the surfaces of the first fixed contact 4 and the first movable contact 7 facing each other in the width direction of the movable contact 9 as magnets 10 of the same polarity through the movable contact 9. The magnet 10 constituting the first magnet pair 11 is, for example, a plate-shaped permanent magnet, and is configured on one side of the first movable contact 7 compared to the midpoint in the length direction of the movable contact 9. Figure 4 In the example of , the magnet 10 is composed of one permanent magnet. The permanent magnet may also be divided into a plurality of pieces. In addition, the middle point of the movable contact 9 is located at a position that divides the first movable contact 7 and the second movable contact 8 equally.

[0044] Each magnet 10 of the first magnet pair 11 is close to the movable contact 9 at the midpoint side in the longitudinal direction of the movable contact 9, and the distance between the opposing surfaces is reduced, that is, the second movable contact 8 side is closer than the first movable contact 7 side ( Figure 4 The first fixed contact 4 and the first movable contact 7 are arranged so as to be closer to the movable contact 9 and extend outward from the movable contact 9 in the negative direction of the y-axis.

[0045] If the first magnet pair 11 is arranged in the above manner, an arc extinguishing space is formed obliquely outward from the first movable contact 7, and the arc generated between the first fixed contact 4 and the first movable contact 7 is stretched to the arc extinguishing space. Hereinafter, the arc extinguishing space outward from the first movable contact 7 in the positive direction of the x-axis and the positive direction of the y-axis is referred to as the first arc extinguishing space 13, and the arc extinguishing space outward from the first movable contact 7 in the negative direction of the x-axis and the positive direction of the y-axis is referred to as the second arc extinguishing space 14.

[0046] In addition, the second magnet pair 12 is similar to the first magnet pair 11, and is configured by setting the surfaces of the second fixed contact 6 and the second movable contact 8 facing each other in the width direction of the movable contact 9 as magnets 10 of the same polarity across the movable contact 9. The magnet 10 constituting the second magnet pair 12 is arranged closer to the second movable contact 8 than the midpoint of the movable contact 9 in the length direction.

[0047] Each magnet 10 of the second magnet pair 12 is close to the movable contact 9 at the midpoint side in the longitudinal direction of the movable contact 9, and the distance between the opposing surfaces becomes smaller, that is, the first movable contact 7 side is closer than the second movable contact 8 side ( Figure 4 The second fixed contact 6 and the second movable contact 8 are arranged so as to be closer to the movable contact 9 and extend outward from the movable contact 9 in the positive direction of the y-axis.

[0048] If the second magnet pair 12 is arranged in the above manner, an arc extinguishing space is formed obliquely outward from the second movable contact 8, and the arc generated between the second fixed contact 6 and the second movable contact 8 is stretched to the arc extinguishing space. Hereinafter, the arc extinguishing space outward from the second movable contact 8 in the negative direction of the x-axis and the negative direction of the y-axis is referred to as the third arc extinguishing space 15, and the arc extinguishing space outward from the second movable contact 8 in the positive direction of the x-axis and the negative direction of the y-axis is referred to as the fourth arc extinguishing space 16. The first magnet pair 11 and the second magnet pair 12 are preferably arranged approximately symmetrically.

[0049] Here, the magnets 10 of each magnet pair constituting the first magnet pair 11 and the second magnet pair 12 only need to be less than or equal to the height accommodated in the arc extinguishing chamber 2, and preferably the height is above the contact gap formed by each fixed contact and each movable contact. If the height of the magnet 10 is the contact gap, the magnetic flux generated by the magnet 10 can efficiently pass through the contact gap that generates the arc. In addition, the magnets 10 of each magnet pair are preferably of the same shape, and are arranged line-symmetrically with the center of the length direction of the movable contact 9 as the axis. If so, the unevenness of the magnetic field near the contact can be suppressed, and the difference in the stretching direction of the arc caused by the direction of the current can be prevented.

[0050] As described above, by arranging the first magnet pair 11 and the second magnet pair 12 obliquely, the magnet 10 can be brought close to the movable contact 9, and the magnetic field near the contact can be strengthened, compared with the case where the magnet 10 is arranged parallel to the movable contact 9. In addition, an arc extinguishing space where the arc is stretched is ensured obliquely outside each movable contact, so that the arc extinguishing performance of the switch 1 can be improved. In addition, by arranging as described above, the magnet 10 of each magnet pair is opened relative to each arc extinguishing space, and the magnetic field of the magnet 10 that may hinder the stretching of the arc on the outer side of the length direction of the movable contact 9 wound around the magnet 10 can be suppressed. In addition, the magnetic poles of the opposite surfaces of the magnet 10 are the same, and the magnetic field distribution is linearly symmetrical relative to the center of the movable contact 9, so the above-mentioned effect can be obtained regardless of the direction of the current flowing through the movable contact 9.

[0051] Next, use Figure 5 The driving force acting on the arc is described by taking as an example the case where each magnet 10 of the first magnet pair 11 and the second magnet pair 12 is arranged at an angle relative to the movable contact member 9 and the opposing surfaces of each magnet pair are N poles.

[0052] When an arc is generated between the first fixed contact 4 and the first movable contact 7 and the current is conducted in the positive direction of the z-axis, the magnetic field ( Figure 5 The arc is stretched in the negative direction of the x-axis due to the y-axis component of the first magnet pair 11. Figure 5 The x-axis component of the magnetic field formed by the magnet 10 on the left side (negative x-axis side) near the contact point is stretched in the positive y-axis direction. As a result, the arc is stretched in the direction toward the second arc extinguishing space 14 ( Figure 5 medium thick arrow).

[0053] The extension of the arc caused by the second magnet pair 12 is the same as that of the first magnet pair 11. When an arc is generated between the second fixed contact 6 and the second movable contact 8 and the current is conducted in the negative direction of the z-axis, the magnetic field ( Figure 5 The arc is stretched in the negative direction of the x-axis due to the y-axis component of the second magnet pair 12. Figure 5 The x-axis component of the magnetic field formed by the magnet 10 on the left side (positive x-axis side) near the contact point is stretched in the negative y-axis direction. As a result, the arc is stretched in the direction toward the third arc extinguishing space 15 ( Figure 5In addition, in the present embodiment, when the direction of the current flowing through the movable contact 9 becomes the opposite direction, that is, when an arc whose current direction becomes the negative direction of the z-axis is generated between the first fixed contact 4 and the first movable contact 7, and an arc whose current direction becomes the positive direction of the z-axis is generated between the second fixed contact 6 and the second movable contact 8, due to the effect of the same magnetic field, the arc generated between the first fixed contact 4 and the first movable contact 7 is stretched to the first arc extinguishing space 13, and the arc generated between the second fixed contact 6 and the second movable contact 8 is stretched to the fourth arc extinguishing space 16.

[0054] In addition, if Figure 6 , Figure 7 As shown, if the magnet 10 is arranged in such a manner that the distance between the opposite surfaces toward the middle point of the movable contact 9 becomes smaller, the magnetic flux is concentrated near the contact point compared with the case where the magnet 10 is arranged in parallel. As described above, compared with the case where each magnet pair is parallel, the y-axis component becomes larger, so the driving force acting on the arc in the x-axis direction can be increased. In addition, the first magnet pair 11 and the second magnet pair 12 are arranged in such a manner that the distance between the opposite surfaces toward the positive direction and the negative direction of the y-axis are expanded, that is, in a manner that expands outward, so that the influence of the magnetic field that draws in the arc at the end of the outer side of each magnet pair can be suppressed. Therefore, it is possible to suppress the extension of the arc from being hindered by the magnetic field that draws in the magnet 10 at the end of the outer side.

[0055] Here, the angle formed by each magnet pair and the axis in the longitudinal direction of the movable contact 9, that is, the angle formed by the magnet 10 constituting each magnet pair and the y-axis when observed from the upper surface, only needs to be greater than 0° and less than 90°. From the perspective of miniaturization of the arc extinguishing chamber 2, it is preferred that the above angle is greater than or equal to 5° and less than or equal to 45°, and in order to achieve effective arc stretching, it is preferred that the magnetic field is concentrated near the contact point at a value greater than or equal to 15° and less than or equal to 30°. The angles of the first magnet pair 11 and the second magnet pair 12 are preferably the same, but are not limited to the range in which the effect is achieved, and the angles of the first magnet pair 11 and the second magnet pair 12 may also be different.

[0056] As described above, the present invention comprises: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 at both ends in the length direction, which can contact or separate with the first fixed contact 4 and the second fixed contact 6 respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged so that the magnets 10 of the first magnet pair 11 are arranged close to the middle point of the movable contact 9 by setting the respective opposing surfaces as magnets 10 of the same polarity, and the magnets 10 of the second magnet pair 12, which are arranged closer to the second movable contact 8 than the first magnet pair 11, are arranged close to the middle point of the movable contact 9, thereby concentrating the magnetic field near the contact point to increase the driving force acting on the arc, and arc extinguishing spaces 13 to 16 can be ensured, thereby improving the arc extinguishing performance.

[0057] In addition, in the present embodiment, an example is described in which the magnetic poles of the opposing surfaces of the first magnet pair 11 and the second magnet pair 12 are N poles, but the opposing surfaces only need to be the same poles and may be S poles. Furthermore, the magnetic poles of the opposing surfaces of the first magnet pair 11 and the magnetic poles of the opposing surfaces of the second magnet pair 12 may be different between the magnet pairs. For example, in the case where the magnetic poles of the opposing surfaces of the first magnet pair 11 and the second magnet pair 12 are S poles, the arc generated between the first fixed contact 4 and the first movable contact 7 with the current direction being the positive direction of the z-axis is stretched to the first arc extinguishing space 13, and the arc generated between the second fixed contact 6 and the second movable contact 8 with the current direction being the negative direction of the z-axis is stretched to the fourth arc extinguishing space 16.

[0058] Implementation method 2.

[0059] Figure 8 and Fig. 9 They are respectively an oblique view and a top view showing the arc extinguishing chamber 2 of the switch 1 involved in the second embodiment. The switch 1 involved in the second embodiment has: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. In this embodiment, the difference is that the first yoke pair 17 and the second yoke pair 18 connected to the first magnet pair 11 and the second magnet pair 12 are further provided. The same reference numerals are given to the same structural elements as those in the first embodiment, and their description is omitted.

[0060] The first yoke pair 17 includes a connection portion 19 connected to the magnet 10 provided on the surface opposite to the surface of the first magnet pair 11 facing the magnet 10, and a magnetic flux guide portion 20 bent from the connection portion 19 to approach the first movable contact 7 to guide the magnetic flux from the magnet 10. In addition, the second yoke pair 18 includes, similarly to the first yoke pair 17, a connection portion 19 connected to the magnet 10 provided on the surface opposite to the surface of the second magnet pair 12 facing the magnet 10, and a magnetic flux guide portion 20 bent from the connection portion 19 to approach the second movable contact 8 to guide the magnetic flux from the magnet 10. Each yoke pair of the first yoke pair 17 and the second yoke pair 18 is formed of a magnetic material. Each yoke pair ensures an arc extinguishing space and can guide the magnetic flux of the magnet 10, and the first magnet pair 11 and the second magnet pair 12 each form a magnetic circuit.

[0061] That is, the first yoke pair 17 has a first connection portion connected to the magnets 10 of the first magnet pair 11, and a first magnetic flux guide portion bent from the first connection portion in a manner close to the movable contact 9 and provided on the outside in the length direction of the first movable contact 7. The second yoke pair 18 also has a second connection portion connected to the magnets 10 of the second magnet pair 12, and a second magnetic flux guide portion bent from the second connection portion in a manner close to the movable contact 9 and provided on the outside in the length direction of the second movable contact 8, similarly to the first yoke pair 17.

[0062] like Fig. 9 As shown in the top view of FIG. 1 , arc extinguishing spaces are formed at the corners of the first yoke pair 17 and the second yoke pair 18 bent into an L shape. Fig. 9 In the example, the arc extinguishing space at the corner located in the positive direction of the x-axis and the positive direction of the y-axis from the first movable contact 7 is the first arc extinguishing space 13, the arc extinguishing space at the corner located in the negative direction of the x-axis and the positive direction of the y-axis from the first movable contact 7 is the second arc extinguishing space 14, the arc extinguishing space at the corner located in the negative direction of the x-axis and the negative direction of the y-axis from the second movable contact 8 is the third arc extinguishing space 15, and the arc extinguishing space at the corner located in the positive direction of the x-axis and the negative direction of the y-axis from the second movable contact 8 is the fourth arc extinguishing space 16.

[0063] Here, each yoke pair preferably extends the connection portion 19 from the position in contact with the magnet 10 in a manner to ensure arc extinguishing space, and the magnetic flux guide portion 20 is bent and provided in a manner parallel to the x-axis. As described above, the magnetic flux generated from the first magnet pair 11 can be guided near the contact point formed by the first fixed contact 4 and the first movable contact 7, and the magnetic flux generated from the second magnet pair 12 can be guided near the contact point formed by the second fixed contact 6 and the second movable contact 8.

[0064] Fig.10 is the magnetic flux lines when the switch 1 has each yoke pair ( Fig.10 The schematic diagram of the dashed line in the middle. Fig.10 In the example, the opposite faces of each magnet pair are set to N poles. Fig.10 As shown, in the magnetic field formed by each magnet pair, the magnetic field component passing near the contact point becomes larger along the movable contact 9 than in the case where there is no yoke pair. As described above, it is possible to suppress the component of the magnetic field wound around each magnet 10, that is, the component of the magnetic field that pulls the arc toward the center of the movable contact 9 from acting on the arc, so it becomes easy to pull the arc toward each arc extinguishing space.

[0065] As described above, by providing the first yoke pair 17 and the second yoke pair 18 , the magnetic flux can be guided near the contact points, and the magnetic field near the contact points can be strengthened, so that the arc extinguishing performance can be further improved.

[0066] In addition, in the present embodiment, an example in which the magnetic flux guide portion 20 is set to be parallel to the x-axis is described, but the direction in which the magnetic flux guide portion 20 extends may not be parallel to the x-axis. For example, if the movable contact 9 is brought closer to the extent that does not hinder the arc extinguishing space, that is, the internal angle formed by the connecting portion 19 and the magnetic flux guide portion 20 becomes an acute angle, the contact point and the yoke pair are brought closer, so that the magnetic flux can be further concentrated near the contact point, and the arc extinguishing chamber 2 can be miniaturized. In addition, for example, if the movable contact 9 is moved away from the extent that does not hinder the guidance of the magnetic flux, that is, the internal angle formed by the connecting portion 19 and the magnetic flux guide portion 20 becomes an obtuse angle, the arc extinguishing space can be further expanded.

[0067] In addition, in the present embodiment, an example in which the first yoke pair 17 and the second yoke pair 18 are separated is described, but the magnetic flux guide portion 20 of the first yoke pair 17 may be formed continuously, and the magnetic flux guide portion 20 of the second yoke pair 18 may be formed continuously. In addition, the first yoke pair 17 and the second yoke pair 18 may be formed as one body. In this case, the connection portions 19 of the first yoke pair 17 and the second yoke pair 18 may be formed as one body in a continuous manner.

[0068] Implementation method 3.

[0069] Fig.11 and Fig.121 are a perspective view and a plan view showing the arc extinguishing chamber 2 of the switch 1 according to the third embodiment. The switch 1 according to the present embodiment, like the first embodiment, comprises: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. The third embodiment is different in that a first yoke pair 17 and a second yoke pair 18 are further provided, which are connected to the first magnet pair 11 and the second magnet pair 12, respectively, and a protrusion 21 protruding toward the movable contact 9 is provided on the first yoke pair 17 and the second yoke pair 18. The same reference numerals are given to the same structural elements as those in the first embodiment, and their description is omitted.

[0070] like Fig.12 As shown in FIG. 1 , the protrusion 21 is provided on the magnetic flux guide portion 20 of each yoke pair in a manner close to the movable contact piece 9. Fig.12 In the example, the protrusion 21 protrudes in the direction along the length direction. The protrusion 21 preferably protrudes in the direction parallel to the length direction. In addition, it is preferred that the protrusion 21 of the first yoke pair 17 is located in a position from the first movable contact 7 toward the positive direction of the y-axis, and the protrusion 21 of the second yoke pair 18 is located in a position from the second movable contact 8 toward the negative direction of the y-axis.

[0071] That is, the first yoke pair 17 has a first connection portion connected to the magnets 10 of the first magnet pair 11, and a first protrusion bent from the first connection portion in a manner close to the movable contact 9, and the first magnetic flux guide portion is provided outside the first movable contact 7, and further close to the length direction of the movable contact 9. The second yoke pair 18 also has a second connection portion connected to the magnets 10 of the second magnet pair 12, and a second protrusion bent from the second connection portion in a manner close to the movable contact 9, and the second magnetic flux guide portion is provided outside the second movable contact 8, and further close to the length direction of the movable contact 9, similarly to the first yoke pair 17.

[0072] As described above, by providing the protrusions 21 on the first yoke pair 17 and the second yoke pair 18 so as to be close to the first movable contact 7 and the second movable contact 8, respectively, Fig.13 The magnetic flux lines ( Fig.13 As shown in the schematic diagram of the middle dotted line, the magnetic flux can be guided near each contact point. That is, the magnetic field near each contact point can be strengthened, so the driving force acting on the arc is increased and the arc extinguishing performance is improved.

[0073] In the present embodiment, the example in which the protruding portion 21 is provided on each of the first yoke pair 17 and the second yoke pair 18 is described. However, the protruding portion 21 may be provided on either the first yoke pair 17 or the second yoke pair 18 .

[0074] Implementation method 4.

[0075] Fig.14 and Fig.15 1 are a perspective view and a top view showing the arc extinguishing chamber 2 of the switch 1 according to the fourth embodiment. The switch 1 according to the present embodiment, like the first embodiment, comprises: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. In the present embodiment, the difference is that the first yoke pair 17 and the second yoke pair 18 are connected to the first magnet pair 11 and the second magnet pair 12, respectively, and have a protrusion 21 protruding toward the movable contact 9, and the height of the protrusion 21 is the degree of the contact gap formed between the contacts. The same reference numerals are given to the same structural elements as those in the first embodiment, and their description is omitted.

[0076] like Fig.14 As shown in FIG. 1 , the protrusion 21 is provided on the magnetic flux guide 20 of each yoke pair in a manner close to the movable contact 9. In addition, the protrusion 21 is provided with a cutout portion adjacent to the protrusion 21, which is formed at a height corresponding to the contact gap formed between the contacts. The cutout portion only needs to be provided in at least one of the upper direction or the lower direction of the protrusion 21. Fig.14 In the example of FIG. 1 , cutouts are provided in the upper and lower directions of the protruding portion 21 .

[0077] From the viewpoint of guiding the magnetic flux, the protrusion 21 of the first yoke pair 17 is arranged outside the length direction of the first fixed contact 4 and the first movable contact 7 in such a manner that at least a part of the protrusion 21 is located between the first fixed contact 4 and the first movable contact 7 in the height direction of the movable contact 9 when disconnected. In addition, the protrusion 21 of the second yoke pair 18 is also arranged outside the length direction of the second fixed contact 6 and the second movable contact 8 in such a manner that at least a part of the protrusion 21 is located between the second fixed contact 6 and the second movable contact 8 in the height direction of the movable contact 9 when disconnected. Here, the time of disconnection refers to the time when the contact gap between each fixed contact and each movable contact becomes the maximum during the operation of the switch 1.

[0078] As described above, by providing the protrusions 21 having a height equal to the contact gap on the first yoke pair 17 and the second yoke pair 18 so as to be close to the first movable contact 7 and the second movable contact 8, respectively, the magnetic flux can be guided near each contact and in the contact gap. That is, the magnetic flux density near each contact and in each contact gap increases, thereby increasing the driving force acting on the arc and improving the arc extinguishing performance.

[0079] In addition, Fig.14 In the example, the protrusion 21 protrudes in the direction along the length direction. The protrusion 21 preferably protrudes in the direction parallel to the length direction. In addition, it is preferred that the protrusion 21 of the first yoke pair 17 is located in a position from the first movable contact 7 toward the positive direction of the y-axis, and the protrusion 21 of the second yoke pair 18 is located in a position from the second movable contact 8 toward the negative direction of the y-axis.

[0080] In the present embodiment, the height of the protrusion 21 can be set to be approximately the same as the contact gap, but may be larger or smaller than the contact gap within a range that produces an effect.

[0081] Implementation method 5.

[0082] Fig.16 and Fig.17 1 are a perspective view and a plan view showing the inside of the arc extinguishing chamber 2 of the switch 1 according to the fifth embodiment. The switch 1 according to the fifth embodiment, like the first embodiment, comprises: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. The fifth embodiment is different in that an insulating member 22 is further provided on the respective opposing surfaces of the first magnet pair 11 and the second magnet pair 12. The same reference numerals are given to the same structural elements as those in the first embodiment, and their description is omitted.

[0083] like Fig.17 As shown, an insulating member 22 is provided on the opposite surface of each magnet 10 of the first magnet pair 11, that is, the surface on the movable contact 9 side. The insulating member 22 can be formed of an insulating resin such as polyamide with a thickness of about 1 to 2 mm, and the insulating resin contains a flame retardant. Here, in the case of the first yoke pair 17 described above, it is preferred that the insulating member 22 covers the surface on the movable contact 9 side of the first yoke pair 17 and is provided.

[0084] In addition, an insulating member 22 is provided on the opposite surface of each magnet 10 of the second magnet pair 12, that is, the surface on the movable contact 9 side, similarly to the first magnet pair 11. Here, in the case of having the above-mentioned second yoke pair 18, it is preferred that the insulating member 22 is provided to cover the surface of the second yoke pair 18 on the movable contact 9 side.

[0085] As described above, if an insulating member 22 is provided on the surface of each magnet 10 facing the movable contact 9, the insulating member 22 can prevent the arc generated between the contacts from directly contacting the magnet 10, and can prevent thermal demagnetization caused by the high-temperature arc contacting the magnet 10. In addition, when each magnet 10 and each yoke pair are conductive, the insulating member 22 can suppress the insulation breakdown of each contact, each contact piece, permanent magnet and each yoke caused by the contact between each magnet 10 and each yoke pair and the arc.

[0086] Implementation method 6.

[0087] Fig.18 and Fig.19 1 are a perspective view and a plan view showing the inside of the arc extinguishing chamber 2 of the switch 1 according to the sixth embodiment. The switch 1 according to the sixth embodiment, like the first embodiment, comprises: a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. The sixth embodiment is different in that an insulating member 22 having a protrusion 23 is further provided on the respective opposing surfaces of the first magnet pair 11 and the second magnet pair 12. The same reference numerals are given to the same structural elements as those in the first embodiment, and their description is omitted.

[0088] like Fig.18 As shown, an insulating component 22 having a convex portion 23 is provided on the opposite surface of each magnet 10 of the first magnet pair 11, that is, the surface opposite to the movable contact 9. The convex portion 23 is arranged to cross in the extension direction of the arc, that is, to intersect and cross in the z-axis direction in which the movable contact 9 moves. Here, the direction in which the convex portion 23 crosses is preferably orthogonal to the z-axis. In addition, the insulating component 22 can be formed of an insulating resin such as polyamide with a thickness of about 1 to 2 mm, and the insulating resin contains a flame retardant. Here, in the case of the above-mentioned first yoke pair 17, the insulating component 22 is preferably provided to cover the surface of the first yoke pair 17 opposite to the movable contact 9.

[0089] In addition, an insulating member 22 having a convex portion 23 is provided on the opposite surface of each magnet 10 of the second magnet pair 12, that is, the surface opposite to the movable contact 9, similarly to the first magnet pair 11. The convex portion 23 is provided to cross the arc extension direction, that is, the z-axis direction in which the movable contact 9 moves. Here, the direction in which the convex portion 23 crosses is preferably orthogonal to the z-axis. Here, in the case of the second yoke pair 18 described above, the insulating member 22 is preferably provided to cover the surface of the second yoke pair 18 opposite to the movable contact 9.

[0090] As described above, if an insulating member 22 is provided on the surface of each magnet 10 opposite to the movable contact 9, the arc generated between the contacts can be prevented from directly contacting the magnet 10 by the insulating member 22, and thermal demagnetization caused by the high-temperature arc contacting the magnet 10 can be prevented. In addition, when each magnet 10 and each yoke pair are conductive, the insulating member 22 can suppress the insulation breakdown of each magnet 10 and each yoke pair due to the contact of the arc. And by providing a convex portion 23 on the insulating member 22, if the arc contacts the convex portion 23, it is stretched along the surface of the convex portion 23, so that the arc is stretched longer and the arc extinguishing performance is improved.

[0091] In addition, in the present embodiment, an example in which the convex portion 23 is provided at the portion of the insulating member 22 covering each magnet 10 is described, but in the case of having the first yoke pair 17 and the second yoke pair 18, the convex portion 23 may be provided on the surface of the insulating member 22 that covers the first yoke pair 17 and the second yoke pair 18 and that faces the movable contact 9. For example, if the convex portion 23 is provided over the entire surface of the insulating member 22 that faces the movable contact 9, the arc can be stretched longer when the arc contacts the insulating member 22. In addition, a concave portion may be provided on the insulating member 22, and both the concave portion and the convex portion 23 may be provided.

[0092] Implementation method 7.

[0093] Fig. 20 It is a partial cross-sectional view showing the inside of the arc extinguishing chamber 2 of the switch 1 according to the seventh embodiment. Fig. 20 For example, it is equivalent to Fig.19 In addition, Fig. 20In order to facilitate the structural description in Embodiment 7, a cover 24 covering each arc extinguishing chamber 2 is depicted on the switch 1, but the shape is not limited to the shape shown in the figure. The cover 24 covers the space where the movable contact 9, the first magnet pair 11 and the second magnet pair 12 are arranged. In one example, the cover 24 is configured to cover the surface of the space surrounded by the first yoke pair 17 and the second yoke pair 18 in the x-axis direction, the y-axis direction and the z-axis direction. In one example, the cover 24 is a hollow rectangular parallelepiped that can include the first yoke pair 17 and the second yoke pair 18. The cover 24 has a side surface 24a perpendicular to the x-axis direction, a side surface perpendicular to the z-axis direction, and a surface perpendicular to the y-axis direction and a front surface 24b arranged on the positive direction side of the y-axis.

[0094] The switch 1 according to the seventh embodiment includes, similarly to the first embodiment, a first fixed contact 3 including a first fixed contact 4, a second fixed contact 5 including a second fixed contact 6, a movable contact 9 including a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively, and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle with respect to the movable contact 9. The switch 1 according to the seventh embodiment differs from the first embodiment in that it further includes a resin plate 25. In addition, the same reference numerals are given to the same components as those in the first to sixth embodiments, and their description is omitted.

[0095] like Fig. 20 As shown, the resin plate 25 is spaced apart from the movable contact 9 and is disposed at a position on the opposite side of the movable contact 9 and the first movable contact 7 and the second movable contact 8. The resin plate 25 is a plate-shaped member formed of a thermally decomposable polymer material, and is fixed to, for example, the front surface 24b of the inner side of the cover 24. Alternatively, the resin plate 25 may be formed integrally with the front surface 24b of the cover 24. If the arc Arc contacts the resin plate 25, decomposition gas is generated from the resin plate 25 due to the heat of the arc Arc. In addition, the arc Arc is cooled by the decomposition gas.

[0096] In addition, the space between the movable contact 9 and the resin plate 25 is a space for stretching the arc Arc, i.e., an arc stretching space, so it is preferred that the resin plate 25 is as thin as possible to ensure sufficient arc stretching space. In addition, it is preferred that the resin plate 25 is arranged in a manner that ensures a distance of about 3 mm or more from the convex portion 23.

[0097] In addition, Fig. 20 An example of the arc mode when the arc Arc is extended to the arc extension space is shown. In addition, in the above description, the case where the resin plate 25 is provided in the structure of the sixth embodiment is described, but the resin plate 25 can also be provided in the structures of the first to fifth embodiments.

[0098] As described above, the resin plate 25 is provided in the arc extension space on the opposite side of the first movable contact 7 and the second movable contact 8 with respect to the movable contact 9. As a result, when the arc Arc generated between the contacts is extended, the arc Arc contacts the resin plate 25, and decomposition gas is generated from the resin plate 25 due to the heat of the arc Arc and the like when in contact. Furthermore, the arc Arc is cooled by the decomposition gas of the resin plate 25, and the performance of cutting off the arc Arc can be further improved.

[0099] Implementation method 8.

[0100] Fig.21 It is a partial cross-sectional view showing the inside of the arc extinguishing chamber 2 of the switch 1 according to the eighth embodiment. Fig.21 For example, it is equivalent to Fig.19 XIX-XIX cross-sectional view. The switch 1 involved in the eighth embodiment has, similarly to the first embodiment, a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle relative to the movable contact 9. The switch 1 of the eighth embodiment differs from the first embodiment in that it further has an insulating plate 26. In addition, the same reference numerals are given to the same structural elements as those in the first to seventh embodiments, and their descriptions are omitted.

[0101] like Fig.21 As shown, the insulating plate 26 is a plate-shaped member extending in the y-axis direction and the z-axis direction. The insulating plate 26 is provided at a position on the opposite side of the movable contact 9 to the first movable contact 7 and the second movable contact 8 in a manner extending in the y-axis direction. Specifically, in the central portion of the movable contact 9 in the x-direction, the insulating plate 26 is arranged at a predetermined interval from the movable contact 9 in the z-axis direction in a manner such that the extending direction of the insulating plate 26 is parallel to the longitudinal direction of the movable contact 9, i.e., the y-axis direction. Fig.21 In the example, the insulating plate 26 is arranged in a manner substantially perpendicular to the upper surface of the movable contact 9 along the length direction of the movable contact 9. In one example, the insulating plate 26 is formed of an insulating resin such as polyamide or an insulating resin containing a flame retardant. In one example, the thickness of the insulating plate 26 in the x-axis direction is in a range of greater than or equal to 1 mm and less than or equal to 2 mm. The insulating plate 26 is fixed to the front surface 24b of the cover 24, for example. Alternatively, the insulating plate 26 may be integrally formed of the same material as the front surface 24b of the cover 24.

[0102] In the above description, the case where the insulating plate 26 is provided in the structure of the sixth embodiment is described. However, the insulating plate 26 may be provided in the structures of the first to fifth embodiments in the same manner.

[0103] Here, the effects obtained by providing the insulating plate 26 will be described. Fig. 22 and Fig.23 1 is a cross-sectional view showing an example of a state of an arc Arc in the switch 1 when the insulating plate 26 is not provided. Fig. 22 and Fig.23 For example, the method corresponding to Embodiment 6 Fig.19 XIX-XIX section view in. Fig. 22 and Fig.23 The switch 1 is the switch 1 shown in the sixth embodiment, but the insulating plate 26 is not provided on the front surface 24 b of the cover 24 .

[0104] In the case where the insulating plate 26 is not provided, Fig. 22 As shown, the arc Arc is generated between the first fixed contact 4 and the first movable contact 7 and between the second fixed contact 6 and the second movable contact 8. In addition, when the arc Arc is driven to the magnet 10 side, the arc Arc is stretched by the convex portion 23 of the insulating member 22. Fig. 22 The status of Fig.23 As shown, the space between the movable contact 9 and the front surface 24b of the cover 24 moves toward the positive direction of the x-axis. When the current is large, the high-temperature gas generated by the arc Arc is blown between the first fixed contact 4 and the first movable contact 7 and between the second fixed contact 6 and the second movable contact 8, thereby sometimes the arc Arc returns again between the first fixed contact 4 and the first movable contact 7 and between the second fixed contact 6 and the second movable contact 8. As described above, when the insulating plate 26 is not provided, the arc interruption performance is sometimes reduced.

[0105] Fig.24 It is a cross-sectional view showing an example of a state of an arc Arc in the switch 1 according to the eighth embodiment. Fig.24 For example, the method corresponding to Embodiment 6 Fig.19 In the switch 1 of the eighth embodiment, as shown in FIG. Fig.24 As shown, the space between the movable contact 9 and the front surface 24b of the cover 24 has an insulating plate 26 extending in the y-axis direction and the z-axis direction, thereby restricting the movement of the arc Arc in the x-axis direction. As a result, high arc interruption performance can be maintained.

[0106] In addition, when the movable contact 9 moves in the z-axis direction, it is preferred that the movable contact 9 and the insulating plate 26 are separated by a predetermined interval so as not to collide. On the other hand, if the interval is too large, the effect of limiting the movement of the arc Arc becomes small, so the interval between the movable contact 9 and the insulating plate 26 in the state of non-contact between the first fixed contact 4 and the first movable contact 7 and between the second fixed contact 6 and the second movable contact 8 is preferably less than or equal to 5 mm.

[0107] Implementation method 9.

[0108] Fig.25 It is a partial cross-sectional view showing the inside of the arc extinguishing chamber 2 of the switch 1 according to the ninth embodiment. Fig.25 For example, it is equivalent to Fig.19 1 is a cross-sectional view of XIX-XIX. The switch 1 involved in embodiment 9 has, similarly to embodiment 1, a first fixed contact 3 having a first fixed contact 4; a second fixed contact 5 having a second fixed contact 6; a movable contact 9 having a first movable contact 7 and a second movable contact 8 capable of contacting or separating with the first fixed contact 4 and the second fixed contact 6, respectively; and a first magnet pair 11 and a second magnet pair 12, which are arranged across the movable contact 9 and have an angle relative to the movable contact 9. The switch 1 of embodiment 9 is different from embodiment 1 in that it also has a gas flow path 27 and an exhaust port 28. In addition, the same reference numerals are given to the same structural elements as those in embodiments 1 to 8, and their descriptions are omitted.

[0109] like Fig.25 As shown, the exhaust port 28 is provided on the side surface 24a of the cover 24 in one example. Fig.25 In the embodiment, the exhaust port 28 is provided at the end of the side surface 24a in the negative direction of the z-axis. Fig.25 In FIG. 1 , an example is shown in which the exhaust port 28 is provided on the side surface 24a in the direction perpendicular to the x-axis, but it may also be provided on the side surface perpendicular to the y-axis direction. Fig.25 Although an example in which two exhaust ports 28 are provided is shown, at least one exhaust port 28 may be provided.

[0110] The gas flow path 27 is provided inside the cover 24 between the outer surfaces of the first yoke pair 17 and the second yoke pair 18 and the inner surface of the cover 24, and guides the gas to the exhaust port 28 along the inner front surface 24b and the side surface 24a of the cover 24. Fig.25 In the example of FIG. 1 , the cover 24 is arranged to contact the ends of the first yoke pair 17 and the second yoke pair 18 on the negative direction side of the z-axis, and not to contact the ends of the first yoke pair 17 and the second yoke pair 18 on the positive direction side of the z-axis. That is, the gas flow path 27 is arranged to detour in the direction of the first movable contact 7 and the second movable contact 8 when viewed from the first fixed contact 4 and the second fixed contact 6.

[0111] Specifically, the gas flow path 27 is provided as a space inside the cover 24 between the side surface 24a in the x-axis direction and the first yoke pair 17 and the second yoke pair 18. In addition, the gas flow path 27 is provided as a space inside the cover 24 between the front surface 24b of the cover 24 and the ends of the first yoke pair 17 and the second yoke pair 18, the magnet 10, and the insulating member 22 on the positive z-axis direction. In addition, the gas flow path 27 may be provided as a space inside the cover 24 between the side surface in the y-axis direction and the first yoke pair 17 and the second yoke pair 18. As described above, the cover 24 is provided in such a manner that the side surface 24a in the x-axis direction and the ends of the first yoke pair 17 and the second yoke pair 18 in the positive z-axis direction do not contact the cover 24.

[0112] The gas generated by the arc Arc flows in the gas flow path 27 , and the gas is exhausted to the outside of the cover 24 from the exhaust port 28 .

[0113] In addition, in the above description, the case where the gas flow path 27 and the exhaust port 28 are provided in the structure of the eighth embodiment is described, but the gas flow path 27 and the exhaust port 28 may be provided in the structures of the first to seventh embodiments. For example, in the case of the structure of the first embodiment, the gas flow path 27 is provided between the outer surface of the first magnet pair 11 and the second magnet pair 12 and the inner side surface 24a of the cover 24. In addition, the cover 24 is arranged so as to contact the end of the first magnet pair 11 and the second magnet pair 12 on the side where the first fixed contact 3 and the second fixed contact 5 are arranged in the height direction of the movable contact 9, and not to contact the end of the first magnet pair 11 and the second magnet pair 12 on the side where the movable contact 9 is arranged.

[0114] As described above, by providing the gas flow path 27 and the exhaust port 28, when the internal pressure of the cover 24 increases due to the gas generated by the arc Arc, the generated gas is guided to the gas flow path 27 and exhausted from the exhaust port 28, thereby obtaining a driving force that guides the arc Arc in a direction of stretching. Therefore, the arc Arc can be stretched more quickly to improve the cutting performance. In addition, the increase in internal pressure can be reduced, so the strength of the cover 24 can be reduced compared to the case where the gas flow path 27 and the exhaust port 28 are not provided in the cover 24, and the cost for manufacturing the switch 1 can be reduced.

[0115] Furthermore, a gas flow path 27 is provided in a manner that detours the direction of the first movable contact 7 and the second movable contact 8 when viewed from the first fixed contact 4 and the second fixed contact 6. Thus, for example, when foreign matter intrudes from the outside through the exhaust port 28, it is possible to prevent the foreign matter from adhering to the vicinity of the first fixed contact 4, the second fixed contact 6, the first movable contact 7, and the second movable contact 8, and the reliability of contact can be improved.

[0116] Furthermore, in Embodiments 1 to 9, examples are described in which the switch 1 has arc extinguishing chambers 2 for the first and second phases, but the switch 1 only needs to have at least one arc extinguishing chamber 2, and the number of arc extinguishing chambers 2 may be three or more.

[0117] In addition, in Embodiments 1 to 9, an example in which two magnets 10 constitute each magnet pair is described, but it may also be composed of more than or equal to 3. In this case, it is preferred that the number of magnets 10 constituting each magnet pair is the same across the movable contact 9. As described above, the unevenness of the magnetic field generated near the contact point can be suppressed.

[0118] In addition, in Embodiments 1 to 9, the example in which the first fixed contact 3 is connected to the load and the second fixed contact 5 is connected to the power supply is described, but the first fixed contact 3 may be connected to the power supply and the second fixed contact 5 may be connected to the load. As described above, the arc can also be stretched in the direction of stretching to each arc extinguishing space.

[0119] The structure shown in the above embodiment is only an example, and can be combined with other well-known technologies, and the embodiments can be combined with each other. Part of the structure can be omitted or changed without departing from the scope of the subject matter.

[0120] Description of the label

[0121] 1 switch, 2 arc extinguishing chamber, 3 first fixed contact, 4 first fixed contact, 5 second fixed contact, 6 second fixed contact, 7 first movable contact, 8 second movable contact, 9 movable contact, 10 magnet, 11 first magnet pair, 12 second magnet pair, 13 first arc extinguishing space, 14 second arc extinguishing space, 15 third arc extinguishing space, 16 fourth arc extinguishing space, 17 first yoke pair, 18 second yoke pair, 19 connecting portion, 20 magnetic flux guide portion, 21 protruding portion, 22 insulating member, 23 protruding portion, 24 cover, 24a side surface, 24b front surface, 25 resin plate, 26 insulating plate, 27 gas flow path, 28 exhaust port.

Claims

1. A switch, characterized in that: have: a first fixed contact having a first fixed contact point; a second fixed contact piece, which is disposed separately from the first fixed contact piece and has a second fixed contact point; A movable contact, wherein a first movable contact capable of contacting or separating with the first fixed contact is disposed at one end in the length direction, and a second movable contact capable of contacting or separating with the second fixed contact is disposed at the other end in the length direction; a first magnet pair, which is composed of a pair of magnets whose faces facing each other in the width direction of the movable contact are set to have the same poles, and is arranged to sandwich the first fixed contact and the first movable contact in a manner that the middle point side of the first movable contact and the second movable contact is close to the movable contact and expands outward; as well as The second magnet pair is composed of a pair of magnets whose faces facing each other in the width direction are set to have the same poles, and is arranged so that the middle point side is close to the movable contact and the second fixed contact and the second movable contact are spread outward.

2. The switch according to claim 1, characterized in that: The angles between the magnets constituting the first magnet pair and the axis in the longitudinal direction are the same when viewed from the top surface. Angles between the magnets constituting the second magnet pair and the axis in the longitudinal direction are the same when viewed from the top surface.

3. The switch according to claim 1 or 2, characterized in that: have: a first yoke pair, each having a first connecting portion and a first magnetic flux guiding portion, the first connecting portion being connected to the magnets constituting the first magnet pair, the first magnetic flux guiding portion being formed by bending the first connecting portion in a manner close to the movable contact in the width direction and being disposed outside the first movable contact; and The second yoke pair respectively has a second connecting portion and a second magnetic flux guiding portion, the first connecting portion is respectively connected to the magnets constituting the second magnet pair, and the second magnetic flux guiding portion bends the second connecting portion in a manner close to the movable contact piece in the width direction and is arranged outside the second movable contact.

4. The switch according to claim 3, characterized in that: The first magnetic flux guiding portion of the first yoke pair and the second magnetic flux guiding portion of the second yoke pair respectively include a first protruding portion and a second protruding portion close to the movable contact in the longitudinal direction.

5. The switch according to claim 4, characterized in that: At least a portion of the first protrusion of the first yoke pair is disposed between the first fixed contact and the first movable contact in the height direction of the movable contact. At least a portion of the second protrusion of the second yoke pair is disposed between the second fixed contact and the second movable contact in the height direction of the movable contact.

6. The switch according to any one of claims 3 to 5, characterized in that: The first yoke pair is formed by continuously integrating the first magnetic flux guide portion. The second yoke pair is formed by continuously integrating the second magnetic flux guide portion.

7. The switch according to any one of claims 3 to 6, characterized in that: The first yoke pair and the second yoke pair are formed such that the first connecting portion and the second connecting portion are continuously formed as one body.

8. The switch according to any one of claims 1 to 7, characterized in that: At least one of the surfaces on which the first magnet pair faces each other and the surfaces on which the second magnet pair faces each other is covered by an insulating member.

9. The switch according to claim 8, characterized in that: At least one of a convex portion and a concave portion is provided on a surface of the insulating member that faces the movable contact.

10. The switch according to any one of claims 1 to 9, characterized in that: A resin plate is further provided, which is disposed at a distance from the movable contact on the side opposite to the first movable contact and the second movable contact, and is made of a thermally decomposable polymer material.

11. The switch according to any one of claims 1 to 9, characterized in that: An insulating plate is further provided, the insulating plate being disposed on the side of the movable contact opposite to the first movable contact point and the second movable contact point, and extending in the longitudinal direction and the height direction of the movable contact point with a gap therebetween.

12. The switch according to any one of claims 1 to 11, characterized in that: A cover is further provided, the cover covering the space where the movable contact, the first magnet pair and the second magnet pair are arranged. The cover has: exhaust port; and A gas flow path is connected to the exhaust port and is provided between the outer surfaces of the first magnet pair and the second magnet pair and the inner side surface of the cover.

13. The switch according to claim 12, characterized in that: The exhaust port is provided on the side of the cover at a height direction of the movable contact on which the first fixed contact and the second fixed contact are arranged. The cover is configured in the height direction of the movable contact piece to contact the ends of the first magnet pair and the second magnet pair on the side where the first fixed contact piece and the second fixed contact piece are configured, and not to contact the ends of the first magnet pair and the second magnet pair on the side where the movable contact piece is configured.

Images