Arc extinguishing system and direct current switch

Abstract

The arc extinguishing system comprises an arc isolating cover and at least one pair of arc extinguishing magnets, a magnetic field space is reserved in each pair of arc extinguishing magnets in a first direction, a contact mechanism is arranged in the magnetic field space, the contact mechanism comprises a moving contact bridge and two static contacts, and the moving contact bridge is connected with the static contacts. The moving contact bridge is arranged along a second direction and moves in a third direction, so that two moving contact parts of the moving contact bridge are respectively matched with the two static contacts, the first direction, the second direction and the third direction are mutually perpendicular, two ends of each arc extinguishing magnet are respectively two magnetic poles, and the two magnetic poles are mutually perpendicular to each other. The connecting line between the two magnetic poles of the same arc extinguishing magnet is parallel to the second direction, and the same magnetic poles of the same pair of arc extinguishing magnets face the same direction. The contact mechanism is located between the arc extinguishing magnets arranged in pairs, and the magnetic poles of the arc extinguishing magnets are located at the end positions, so that the magnetic induction lines of the arc extinguishing magnets in the magnetic field space are parallel to the movable contact bridge, the limitation of the space on the sizes of the arc extinguishing magnets is relieved, and the arc extinguishing effect is improved.

Description

Technical Field

[0001] The invention relates to the field of electrical switches, and in particular to an arc extinguishing system and a direct current switch. Background Art

[0002] DC relay is a switching device widely used in charging piles, vehicle power management and energy storage. As the load voltage increases, the breaking current causes the arc energy to increase, which also puts higher requirements on the arc extinguishing system of the relay.

[0003] At present, in non-polarity relays, arc extinguishing magnets are usually arranged at both ends of the line connecting the two stationary contacts, thereby generating a magnetic field with magnetic flux lines parallel to the line, making the movement direction of the arc perpendicular to the line between the two stationary contacts, thereby eliminating the risk of short circuit. However, due to the limited space at both ends of the line connecting the two stationary contacts, the size of the magnet is limited, which leads to a weakening of the magnetic field strength and a deterioration of the arc pulling performance. Although the distance between the two stationary contacts can be reduced to obtain a larger space for the arc extinguishing magnet, it will cause the negative impact of reducing the safety distance between the contacts. Summary of the invention

[0004] The object of the present invention is to overcome at least one defect of the prior art and to provide an arc extinguishing system and a DC switch with good arc extinguishing effect and large contact spacing.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an arc extinguishing system, comprising an arc isolation cover and at least one pair of arc extinguishing magnets, each pair of arc extinguishing magnets leaves a magnetic field space in the first direction, a contact mechanism is arranged in the magnetic field space, the contact mechanism comprises a moving contact bridge and two static contacts, the moving contact bridge is arranged along a second direction and moves in a third direction, so that the two moving contact parts of the moving contact bridge are respectively matched with the two static contacts, the first direction, the second direction and the third direction are perpendicular to each other, the two ends of each arc extinguishing magnet are respectively two magnetic poles, the connecting line between the two magnetic poles of the same arc extinguishing magnet is parallel to the second direction, and the like-sex magnetic poles of the same pair of arc extinguishing magnets are oriented in the same direction.

[0007] Preferably, two groups of magnetic conductive components are further included, each group of magnetic conductive components is arranged in the magnetic field space and cooperates with a static contact, each group of magnetic conductive components is respectively cooperated with adjacent arc-extinguishing magnets, each group of magnetic conductive components includes two magnetic conductive parts, and the two magnetic conductive parts of the same group of magnetic conductive components are arranged on opposite sides of a static contact in the second direction.

[0008] Preferably, the magnetic conductive member located between the two stationary contacts is provided with a gap for the moving contact bridge to pass through, and the magnetic conductive member located outside the two stationary contacts is respectively connected to the magnetic poles of adjacent arc-extinguishing magnets.

[0009] Preferably, a notch facing the third direction is formed on one side edge of the magnetic conductive member, and the notches of two magnetic conductive members in the same group of magnetic conductive components are facing away from each other.

[0010] Preferably, the notch of the magnetic conductive member between the two stationary contacts faces the direction of the closing movement of the moving contact bridge.

[0011] Preferably, the plane where each magnetic conductive member is located is parallel to the third direction.

[0012] Preferably, the magnetic conductive member is plugged into the arc isolation cover.

[0013] Preferably, it includes a pair of arc-extinguishing magnets, and the like poles of the pair of arc-extinguishing magnets are connected to the same magnetic conductive member; or, it includes two pairs of arc-extinguishing magnets arranged at intervals along the second direction, one like pole of the two pairs of arc-extinguishing magnets is used to connect to the magnetic conductive member, and the other like poles of the two pairs of arc-extinguishing magnets are spaced opposite to each other in the second direction.

[0014] Preferably, it further includes an arc extinguishing chamber, in the first direction, at least one arc extinguishing chamber is respectively arranged on both sides of each static contact, and in the third direction, the arc extinguishing chamber located on the same side of the contact mechanism is stacked with the arc extinguishing magnet.

[0015] Preferably, the arc isolation cover is divided into two installation cavities and one contact cavity. In the first direction, the two installation cavities are located on opposite sides of the contact cavity. Each installation cavity is divided into an arc extinguishing chamber and a installation groove in the third direction. The arc extinguishing chamber is connected to the contact cavity, and the installation groove is respectively isolated from the adjacent arc extinguishing chamber and contact cavity for assembling arc extinguishing magnets.

[0016] Preferably, each mounting cavity comprises two arc extinguishing chambers and one mounting groove, and the two arc extinguishing chambers in the same mounting cavity are spaced apart in the second direction;

[0017] Alternatively, each mounting cavity includes two arc extinguishing chambers and two mounting grooves, and the two arc extinguishing chambers of the same mounting cavity are spaced apart in the second direction, and the two mounting grooves of the same mounting cavity are respectively stacked with the two arc extinguishing chambers in the third direction.

[0018] Preferably, a linkage hole penetrating the arc isolation cover is provided on the bottom surface of the contact cavity, and the bottom surface of each arc extinguishing chamber is connected.

[0019] Preferably, the arc isolation cover is provided with two groups of slots, each group of slots includes at least two slots, and each magnetic conductive member is correspondingly plugged into a slot.

[0020] Preferably, the arc isolation cover is made of insulating material.

[0021] The present invention also provides a DC switch, comprising a shell and a contact mechanism and an electromagnetic system arranged in the shell. The shell is also provided with the arc extinguishing system as described above. The contact mechanism is arranged in an arc isolation cover of the arc extinguishing system. The arc extinguishing system is driven and connected to the electromagnetic system and arranged along a third direction.

[0022] In the arc extinguishing system and DC switch of the present invention, the contact mechanism is located between arc extinguishing magnets arranged in pairs, and the magnetic poles of the arc extinguishing magnets are located at the end positions, so that the magnetic flux lines of the arc extinguishing magnets in the magnetic field space are parallel to the moving contact bridge, avoiding the arc extinguishing magnets being arranged at both ends of the static contact connection line, which not only removes the space limitation on the size of the arc extinguishing magnet, improves the arc extinguishing effect, but also ensures a safe distance between the two static contacts.

[0023] In addition, two groups of magnetic conductive components are provided in combination. Each group of magnetic conductive components cooperates with adjacent arc-extinguishing magnets to enhance the magnetic field strength corresponding to the position of each static contact, thereby further improving the arc-extinguishing effect.

[0024] In addition, the magnetic conductive member located between the two stationary contacts is provided with a gap for the moving contact bridge to pass through, which can cooperate with other magnetic conductive members to enhance the magnetic field strength and limit the moving contact bridge.

[0025] In particular, the magnetic conductive parts are all provided with notches, and the notches of the two magnetic conductive parts in the same magnetic conductive assembly face different directions, which is conducive to plugging the magnetic conductive parts into the arc isolation cover and can also reduce the size of the slot opened in the arc isolation cover.

[0026] In addition, each static contact cooperates with at least two arc extinguishing chambers, and there is no need to specify the wiring direction. Regardless of the wiring direction, the arc generated by the opening of the contact mechanism will enter the arc extinguishing chamber under the action of the magnetic field. The arc extinguishing chamber and the arc extinguishing magnet are stacked in the third direction, which is conducive to the arc quickly entering the arc extinguishing chamber, and also helps to save the internal space of the arc isolation cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a DC switch in the present invention;

[0028] Figure 2 is a cross-sectional view of a DC switch in the present invention;

[0029] Figure 3 1 is an exploded schematic diagram of the arc extinguishing system of the present invention (first embodiment);

[0030] Figure 4 is a cross-sectional view of the arc extinguishing system of the present invention (first embodiment);

[0031] Figure 5 It is a top view of the arc extinguishing system and the moving contact bridge in the present invention;

[0032] Figure 6 yes Figure 5 AA section view;

[0033] Figure 7 yes Figure 5 BB cross-sectional view;

[0034] Figure 8 is a schematic diagram of the arc entering the arc extinguishing chamber in the present invention;

[0035] Fig. 9 It is a schematic diagram of the structure of the arc isolation cover in the present invention;

[0036] Fig.10 is a side view of the arc isolation cover of the present invention;

[0037] Fig.11 is a bottom view of the arc isolation cover in the present invention;

[0038] Fig.12 is a top view of the arc isolation cover in the present invention;

[0039] Fig.13 1 is an exploded schematic diagram of the arc extinguishing system of the present invention (second embodiment);

[0040] Fig.14 is a cross-sectional view of the arc extinguishing system of the present invention (second embodiment);

[0041] Fig.15 1 is an exploded schematic diagram of the arc extinguishing system of the present invention (third embodiment);

[0042] Fig.16 is a cross-sectional view of the arc extinguishing system of the present invention (third embodiment);

[0043] Reference numerals:

[0044] 1-shell, 11-outer shell, 12-inner shell, 13-cover, 2-contact mechanism, 21-static contact, 22-moving contact bridge, 3-arc extinguishing system, 31-arc isolation cover, 311-contact cavity, 312-installation slot, 314-first slot, 315-second slot, 316-linkage hole, 317-avoidance slot, 32-arc extinguishing magnet, 33-magnetic conductive component, 330-notch, 331-first magnetic conductive part, 332-second magnetic conductive part, 34-arc extinguishing chamber, 4-electromagnetic system, 5-transmission component, a-arc. DETAILED DESCRIPTION

[0045] The specific implementation of the DC switch of the present invention is further described below in conjunction with the embodiments given in the accompanying drawings. The DC switch of the present invention is not limited to the description of the following embodiments.

[0046] like Figure 1 , 2As shown, the DC switch includes a shell 1, in which an electromagnetic system 4, a contact system and an arc extinguishing system 3 are installed, wherein the electromagnetic system 4, the arc extinguishing system 3 and the contact system are arranged in sequence along the axial direction of the shell 1, wherein the contact system includes a contact mechanism 2 and a wiring assembly, the contact mechanism 2 includes a moving contact bridge 22 and two stationary contacts 21, each stationary contact 21 is fixed in the shell 1 and is respectively connected to a wiring assembly that can extend outside the shell 1, the moving contact bridge 22 is driven and connected to the electromagnetic system 4, and the driving part of the electromagnetic system 4 directly or indirectly drives the moving contact bridge 22 to move axially along the shell 1, so that the two moving contacts located at the ends of the moving contact bridge 22 are respectively in contact with or separated from a stationary contact 21, thereby realizing the opening and closing of the contact mechanism 2, and the arc extinguishing system 3 cooperates to extinguish the arc a generated when the contact mechanism 2 is opened.

[0047] For the convenience of description, the direction perpendicular to the axial direction of the shell 1 is the first direction, the direction perpendicular to the first direction and the axial direction of the shell 1 is the second direction, and the axial direction of the shell 1 is the third direction.

[0048] Specifically, the arc extinguishing system 3 includes an arc extinguishing cover 31, an arc extinguishing chamber 34 and at least one pair of arc extinguishing magnets 32, each pair of arc extinguishing magnets 32 is arranged in the arc extinguishing cover 31, and each pair of arc extinguishing magnets 32 has a gap in the first direction to form a magnetic field space, and the magnetic field formed by each pair of arc extinguishing magnets 32 in the magnetic field space can drive the arc a to move into the arc extinguishing chamber 34, thereby extinguishing the arc a when the contact mechanism 2 is opened, and the contact mechanism 2 is correspondingly arranged in the magnetic field space, wherein the moving contact bridge 22 is arranged along the second direction, and the two static contacts 21 are spaced opposite to each other in the second direction, and a transmission component 5 is connected between the moving contact bridge 22 and the driving part of the electromagnetic system 4, and the moving contact bridge 22 is driven by the transmission component 5 to perform linear motion along the third direction, and each static contact 21 cooperates with an arc extinguishing chamber 34, so that the arc a is driven into the arc extinguishing chamber 34 by the Lorentz force in the magnetic field.

[0049] like Figure 3 , 13 As shown in FIG. 15 , the improvement of the present application is that each arc extinguishing magnet 32 ​​has two poles at both ends, the connecting line between the two poles of the same arc extinguishing magnet 32 ​​is parallel to the second direction, and the same pair of arc extinguishing magnets 32 have the same polarity, so that the magnetic flux lines of each pair of poles in the magnetic field space are parallel to the second direction. In this way, the contact mechanism 2 is located between the arc extinguishing magnets 32 arranged in pairs, and the magnetic poles of the arc extinguishing magnets 32 are located at the end positions, so that the magnetic flux lines of the arc extinguishing magnets 32 in the magnetic field space are parallel to the moving contact bridge 22, avoiding the arc extinguishing magnets 32 being arranged at both ends of the connection line of the static contacts 21, which not only removes the space restriction on the size of the arc extinguishing magnets 32, improves the arc extinguishing effect, but also ensures a safe distance between the two static contacts 21.

[0050] Further, such as Figure 3As shown, the arc extinguishing system 3 also includes two groups of magnetic conductive components 33, each group of magnetic conductive components 33 is arranged in the magnetic field space and respectively cooperates with a static contact 21, and each group of magnetic conductive components 33 is respectively cooperated with adjacent arc extinguishing magnets 32 to constrain the magnetic flux lines generated by the arc extinguishing magnets 32, wherein each group of magnetic conductive components 33 includes two magnetic conductive parts, and the two magnetic conductive parts of the same group of magnetic conductive components 33 are spaced opposite to each other in the second direction, and the two magnetic conductive parts are arranged on opposite sides of the same static contact 21. In this way, the magnetic flux lines near the static contact 21 corresponding to the magnetic conductive components 33 are constrained, so that the magnetic field strength corresponding to the position of each static contact 21 can be enhanced, and the arc extinguishing effect is further improved.

[0051] Preferably, the magnetic conductive member between the two stationary contacts 21 is provided with a notch 330 for the moving contact bridge 22 to pass through, so that the magnetic conductive member between the two stationary contacts 21 can cooperate with other magnetic conductive members to enhance the magnetic field strength and also limit the moving contact bridge 22.

[0052] Furthermore, the magnetic conductive parts of each group of magnetic conductive components 33 have the same structure, that is, a notch 330 facing the third direction is provided on one side edge of each magnetic conductive part, so as to simplify the processing of the magnetic conductive parts. The notches 330 of two magnetic conductive parts in the same group of magnetic conductive components 33 face back to back, and the notches 330 of two magnetic conductive parts located between the two static contacts 21 face the direction of the closing movement of the moving contact bridge 22, so as to avoid interfering with the closing of the moving contact bridge 22. When the magnetic conductive parts are plug-fitted with the arc isolation cover 31, the side edge with the notch 330 is plug-fitted with the arc isolation cover 31, which is beneficial for the magnetic conductive parts to be stably plugged into the arc isolation cover 31. At the same time, the size of the slot opened in the arc isolation cover 31 can also be reduced to maintain stable plug-in.

[0053] Furthermore, a pair of arc-extinguishing magnets 32 can be arranged in the arc-isolating cover 31, and the like magnetic poles of the pair of arc-extinguishing magnets 32 are connected to the same magnetic conductive member, that is, the two magnetic conductive members located outside the two static contacts 21 are respectively connected to the two ends of the pair of arc-extinguishing magnets 32, at this time, the N poles (S poles) of the pair of arc-extinguishing magnets 32 are connected to one magnetic conductive member, and the S poles (N poles) of the pair of arc-extinguishing magnets 32 are connected to the other magnetic conductive member; two pairs of arc-extinguishing magnets 32 can also be arranged in the arc-isolating cover 31, one like magnetic pole of the two pairs of arc-extinguishing magnets 32 is used to connect to the magnetic conductive member, and the other like magnetic poles of the two pairs of arc-extinguishing magnets 32 are spaced opposite to each other in the second direction, that is, as Figure 3 As shown, the N poles (or S poles) of the two pairs of arc-extinguishing magnets 32 are respectively connected to the two magnetic conductive members located outside the two stationary contacts 21, and the S poles (N poles) of the two pairs of arc-extinguishing magnets 32 are adjacent and spaced opposite to each other in the second direction. In addition, when the magnetic conductive component 33 is not provided in the arc-isolating cover 31, as shown in FIG. Fig.13 , 15 As shown, arc extinguishing can also be achieved by only arranging one or two pairs of arc extinguishing magnets 32 in the arc isolation cover 31 .

[0054] Preferably, in the first direction, at least one arc extinguishing chamber 34 is provided on one side of each static contact 21, so that the DC switch does not need to specify the wiring direction, and no matter what the wiring direction is, the arc a generated when the contact mechanism 2 is opened will enter the arc extinguishing chamber 34 under the action of the magnetic field. In the third direction, the arc extinguishing chamber 34 and the arc extinguishing magnet 32 ​​located on the same side of the contact mechanism 2 are stacked, which can shorten the distance that the arc a moves to the arc extinguishing chamber 34, which is beneficial for the arc a to quickly enter the arc extinguishing chamber 34, and also helps to save the internal space of the arc isolation cover 31.

[0055] Combination Figure 1-12 A first embodiment of an arc extinguishing system 3 is provided.

[0056] like Figure 3 , 4 As shown, the arc extinguishing system 3 includes an arc extinguishing cover 31, in which two pairs of arc extinguishing magnets 32 and four arc extinguishing chambers 34 are arranged, the two pairs of arc extinguishing magnets 32 are arranged at intervals in the second direction, each pair of arc extinguishing magnets 32 are spaced and opposite to each other in the first direction to form a magnetic field space, and each pair of arc extinguishing magnets 32 correspondingly forms a magnetic field for arc extinguishing in the magnetic field space, the magnetic poles of each arc extinguishing magnet 32 ​​are respectively located at both ends, the connecting line between the two magnetic poles of the same arc extinguishing magnet 32 ​​is parallel to the second direction, the like poles of each pair of arc extinguishing magnets 32 are oriented in the same direction, and the like poles of the two pairs of arc extinguishing magnets 32 are spaced and opposite to each other in the second direction, so that each pair of arc extinguishing magnets 32 forms a magnetic field with magnetic flux lines parallel to the second direction in the corresponding magnetic field space, Figure 4 In the figure, the N poles of the pair of arc-extinguishing magnets 32 on the left side are both facing the left side, the N poles of the pair of arc-extinguishing magnets 32 on the right side are both facing the right side, and the S poles of the two pairs of arc-extinguishing magnets 32 are spaced apart and opposite to each other.

[0057] In the third direction, each arc extinguishing chamber 34 is stacked with an arc extinguishing magnet 32 ​​to save the internal space of the arc isolation cover 31. Figure 8 In the embodiment, each arc extinguishing chamber 34 is isolated from the arc extinguishing magnet 32 ​​and the arc extinguishing chamber 34 is located below the arc extinguishing magnet 32. When the contact mechanism 2 is arranged in the arc isolation cover 31 along the second direction, the two static contacts 21 of the contact mechanism 2 are arranged at intervals in the second direction, and each static contact 21 is respectively located in a corresponding magnetic field space. The arc extinguishing chamber 34 and the arc extinguishing magnet 32 ​​are located on one side of a static contact 21 in the first direction. The moving contact bridge 22 is arranged along the second direction and can move in the third direction, so that the two moving contact parts of the moving contact bridge 22 are respectively in contact with or separated from the two static contacts 21. When each moving contact part is separated from a static contact 21, the arc a moves into the arc extinguishing chamber 34 driven by the Lorentz force.

[0058] Two groups of magnetic conductive components 33 are also provided in the arc isolation cover 31. Each group of magnetic conductive components 33 is arranged in a magnetic field space and cooperates with a static contact 21. Each group of magnetic conductive components 33 cooperates with an adjacent pair of arc extinguishing magnets 32 respectively, and is used to constrain the magnetic flux lines near the static contact 21 to enhance the strength of the magnetic field. Each group of magnetic conductive components 33 includes two magnetic conductive parts. Preferably, the plane where each magnetic conductive part is located is parallel to the third direction. The two magnetic conductive parts of the same group of magnetic conductive components 33 are spaced opposite to each other in the second direction, and each static contact 21 is located between the two magnetic conductive parts in the second direction. The magnetic flux lines in the magnetic field are constrained by the magnetic conductive parts, thereby correspondingly enhancing the magnetic field strength at each static contact 21, thereby further improving the arc extinguishing effect.

[0059] For the convenience of description, each group of magnetic conductive components 33 includes a first magnetic conductive part 331 and a second magnetic conductive part 332, with the two magnetic conductive parts located between the two static contacts 21 being the first magnetic conductive parts 331, and the two magnetic conductive parts located outside the two static contacts 21 being the second magnetic conductive parts 332. A notch 330 is provided in the middle of each first magnetic conductive part 331 for the moving contact bridge 22 to pass through, so that the first magnetic conductive part 331 can cooperate with other magnetic conductive parts to enhance the magnetic field strength and limit the moving contact bridge 22. Preferably, the opening of the notch 330 is toward the closing direction of the moving contact bridge 22, and the inner diameter of the notch 330 is greater than or equal to the outer diameter of the moving contact bridge 22, so as to prevent the first magnetic conductive part 331 from interfering with the opening movement of the moving contact bridge 22.

[0060] Each second magnetic conductive member 332 is respectively connected to an adjacent pair of arc-extinguishing magnets 32, that is, each first magnetic conductive member 331 is connected to the magnetic poles of an adjacent pair of arc-extinguishing magnets 32. In the present embodiment, each first magnetic conductive member 331 is connected to the N pole of an adjacent pair of arc-extinguishing magnets 32, so that the magnetic flux lines generated by the adjacent pair of arc-extinguishing magnets 32 are constrained between the first magnetic conductive member 331 and the second magnetic conductive member 332, thereby enhancing the magnetic field strength at each static contact 21.

[0061] In this embodiment, each group of magnetic conductive components 33 is plugged into the arc isolation cover 31. The arc isolation cover 31 is provided with a slot for plugging in the magnetic conductive parts, which has the advantage of convenient disassembly and assembly. Preferably, the two magnetic conductive parts in each group of magnetic conductive components 33 adopt the same structure to simplify the processing of the magnetic conductive parts.

[0062] like Figure 3-7As shown, each magnetic conductive member is in a rectangular plate-like structure as a whole, and a notch 330 is provided in the middle of one side edge of each magnetic conductive member, and the side of the magnetic conductive member with the notch 330 is plugged into the arc shield 31. When the magnetic conductive member is plugged into the arc shield 31, the plate surface of each magnetic conductive member is parallel to the third direction, which can reduce the slot size on the arc shield 31. Preferably, the notches 330 of the two magnetic conductive members in the same group of magnetic conductive components 33 are back to back, that is, the notch 330 of one magnetic conductive member is in The third direction is upward, and the notch 330 of the other magnetic conductive component is downward in the third direction. In the present embodiment, the first magnetic conductive component 331 is inserted into the arc isolation cover 31 in a U-shape, and the notch 330 of the first magnetic conductive component 331 can allow the moving contact bridge 22 to pass through, which has a limiting effect on the moving contact bridge 22. The second magnetic conductive component 332 is inserted into the arc isolation cover 31 in an N-shape. Correspondingly, the slot opened in the arc isolation cover 31 is in a "-" shape in the first direction, and its size is smaller than that of the "—" shaped slot.

[0063] Combination Figure 8-12 A structure of the arc shield 31 applied to this embodiment is provided. Figure 8 , 12 As shown, the arc shield 31 is made of insulating material, and the arc shield 31 is a rectangular groove structure as a whole. The internal space of the arc shield 31 is divided into two installation cavities and a contact cavity 311. The contact mechanism 2 is correspondingly arranged in the contact cavity 311. The two static contacts 21 are fixed on the housing 1, and each static contact 21 is spaced along the second direction corresponding to the two ends of the contact cavity 311. A linkage hole 316 penetrating the arc shield 31 is opened on the bottom surface of the contact cavity 311. The electromagnetic system 4 or the transmission component 5 of the DC switch is connected to the moving contact bridge 22 through the linkage hole 316, and the moving contact bridge 22 is driven by the electromagnetic system 4 to move in the contact cavity 311 along the third direction. In the first direction, the two installation cavities are located on opposite sides of the contact cavity 311, and each installation cavity is located on the opposite sides of the contact cavity 311. The mounting cavity is divided into an arc extinguishing chamber 34 and a mounting groove 312 in the third direction. In the present embodiment, each mounting cavity includes two arc extinguishing chambers 34 and two mounting grooves 312, and the two arc extinguishing chambers 34 of the same mounting cavity are spaced apart in the second direction, and the two mounting grooves 312 of the same mounting cavity are respectively stacked with the two arc extinguishing chambers 34 in the third direction. There are four mounting grooves 312 and four arc extinguishing chambers 34 in the arc shield 31, each arc extinguishing chamber 34 is connected with the contact cavity 311 and the bottom surface of each arc extinguishing chamber 34 is connected, and each mounting groove 312 on the bottom surface of each arc extinguishing chamber 34 is respectively isolated from the adjacent arc extinguishing chamber 34 and the adjacent contact cavity 311, and an arc extinguishing magnet 32 ​​is correspondingly installed in each mounting groove 312. Of course, each mounting cavity may also include two mounting grooves 312 and one arc extinguishing chamber 34 . In this case, it can be understood that two arc extinguishing chambers 34 spaced apart in the same mounting cavity are connected to form one arc extinguishing chamber 34 , and the arc extinguishing cover 31 as a whole includes four mounting grooves 312 and two arc extinguishing chambers 34 .

[0064] The arc shield 31 is further provided with two groups of slots, each group of magnetic conductive components 33 is correspondingly plugged into one group of slots, and each group of slots includes at least two slots. In this embodiment, each group of slots includes two first slots 314 and two second slots 315, wherein the first slots 314 are provided on the bottom surface of the arc shield 31 facing away from the moving contact bridge 22. Figure 8-12 In the figure, the two first slots 314 in the same group of slots are coaxial in the second direction, and one end of each slot is connected with the linkage hole 316 and extends into the contact cavity 311 accordingly, so that one side of each first magnetic conductive member 331 having a notch 330 is respectively inserted into the two first slots 314; the second slots 315 are opened on the bottom surface of the arc isolation cover 31 facing the moving contact bridge 22, and each second slot 315 is correspondingly located at one end of each mounting cavity, and each second slot 315 is connected with the adjacent mounting slot 312 and the contact cavity 311, so that one side of each first magnetic conductive member 331 having a notch 330 is respectively inserted into the two first slots 314, and the arc extinguishing magnet 32 ​​assembled in the mounting slot 312 is connected to the second magnetic conductive member 332.

[0065] In addition, a sidewall of the contact cavity 311 is provided with an avoidance groove 317 for avoiding a guide portion provided on the moving contact bridge 22 and / or the transmission assembly 5 to prevent the moving contact bridge 22 from being misaligned during movement.

[0066] Combination Figure 4 , 8 The process of the arc a in this embodiment moving to the arc extinguishing chamber 34 and being extinguished is briefly described as follows:

[0067] The two pairs of arc-extinguishing magnets 32 form magnetic fields at both ends of the contact cavity 311, respectively. The magnetic flux lines in the magnetic field are approximately parallel to the second direction. The current between the moving contact bridge 22 and the two stationary contacts 21 flows along the third direction. The current direction of the arc a is also the third direction. Figure 4 In the embodiment, the arc a between the left static contact 21 and the moving contact portion on the left side of the moving contact bridge 22 flows along the third direction away from the electromagnetic system 4, and the arc a moves along the first direction into the arc extinguishing chamber 34 under the action of the Lorentz force, that is, in Figure 4 In the embodiment, the arc a moves upward along the first direction to the arc extinguishing chamber 34 above the left static contact 21, corresponding to Figure 8 Similarly, the arc a between the right static contact 21 and the moving contact portion on the right side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4, and the arc a moves along the first direction to the arc extinguishing chamber 34 under the action of the Lorentz force, that is, in Figure 4 In the embodiment, the arc a moves downward along the first direction to the arc extinguishing chamber 34 above the right static contact 21, corresponding to Figure 8 Another arc extinguishing chamber 34 located on the left side.

[0068] When the current direction in contact mechanism 2 is opposite, Figure 4 In the embodiment, the current of the left static contact 21 and the moving contact part on the left side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4, and the current of the right static contact 21 and the moving contact part on the right side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4. The arcs a at the two static contacts 21 move along the first direction to the arc extinguishing chamber 34 on the same side under the action of the Lorentz force. That is, in Figure 4 In the embodiment, the arc a moves downward along the first direction and enters the two arc extinguishing chambers 34 respectively. Figure 8 The middle arc a correspondingly enters the two arc extinguishing chambers 34 located on the right side.

[0069] Combination Figure 8 , 13 14 provides a second embodiment of the arc extinguishing system 3. In this embodiment, the arc extinguishing system 3 includes an arc extinguishing cover 31. A pair of arc extinguishing magnets 32 and four arc extinguishing chambers 34 are arranged in the arc extinguishing cover 31. The pair of arc extinguishing magnets 32 are spaced relative to each other in a first direction to form a magnetic field space and correspondingly form a magnetic field for arc extinguishing in the magnetic field space. The magnetic poles of each arc extinguishing magnet 32 ​​are respectively located at two ends, and the like magnetic poles of the two arc extinguishing magnets 32 are oriented in the same direction. Figure 1 , 14 In the embodiment, the N poles of the two arc-extinguishing magnets 32 are both oriented to the left, and the S poles are oriented to the right. Thus, the pair of arc-extinguishing magnets 32 form a magnetic field in the magnetic field space with magnetic flux lines parallel to the second direction.

[0070] Similar to the first embodiment, in the third direction, each arc extinguishing chamber 34 is stacked with one end of each arc extinguishing magnet 32. Figure 8 In the embodiment, each arc extinguishing chamber 34 is located below an arc extinguishing magnet 32 ​​near the end position, and the arc extinguishing chamber 34 is not connected to the arc extinguishing magnet 32; the contact mechanism 2 arranged in the arc isolation cover 31 is the same as the first embodiment, when the contact mechanism 2 is arranged in the arc isolation cover 31 along the second direction, the two static contacts 21 of the contact mechanism 2 are arranged at intervals in the second direction, and each static contact 21 is respectively located in a magnetic field space, the arc extinguishing chamber 34 and the arc extinguishing magnet 32 ​​are located on one side of a static contact 21 in the first direction, the moving contact bridge 22 is arranged along the second direction and can be moved in the third direction, so that the two moving contact parts of the moving contact bridge 22 are respectively in contact with or separated from the two static contacts 21, when each moving contact part is separated from a static contact 21, the arc a moves into the arc extinguishing chamber 34 driven by the Lorentz force.

[0071] Similar to the first embodiment, the arc shield 31 is also made of insulating material to form a groove-shaped structure. The space inside the arc shield 31 is divided into two installation chambers and one contact chamber 311. The contact mechanism 2 is assembled in the contact chamber 311. The assembly and movement methods thereof can refer to the first embodiment. In the first direction, the two installation chambers are located on opposite sides of the contact chamber 311. Each installation chamber is divided into an arc extinguishing chamber 34 and an installation groove 312 in the third direction. Different from the first embodiment, each installation chamber includes one installation groove 312 and two arc extinguishing chambers 34. At this time, there are two installation grooves 312 and four arc extinguishing chambers 34 in the arc shield 31. The two arc extinguishing chambers 34 of the mounting cavity are spaced apart in the second direction, and each arc extinguishing chamber 34 is located on one side of a static contact 21 in the first direction and is connected with the contact cavity 311. The coordination between the arc extinguishing chamber 34 and the contact cavity 311 refers to the structure of the arc isolation cover 31 in the first embodiment. In addition, in this embodiment, the two arc extinguishing chambers 34 in the same mounting cavity can also be connected in the second direction to form an arc extinguishing chamber 34; each mounting groove 312 is a strip-shaped groove structure as a whole, and the two ends of each mounting groove 312 are stacked on the two arc extinguishing chambers 34 of the same mounting cavity in the third direction, and an arc extinguishing magnet 32 ​​is correspondingly assembled in each mounting groove 312.

[0072] In addition, the arc shield 31 may also be provided with two groups of slots and avoidance grooves 317 that are the same as those in the first embodiment. It can also be understood that, except for the mounting grooves 312 for assembling the arc extinguishing magnets 32, the remaining structures of the arc shield 31 of this embodiment are the same as those of the first embodiment.

[0073] The principle of arc a moving into the arc extinguishing chamber 34 in this embodiment is briefly described.

[0074] A pair of arc extinguishing magnets 32 form a magnetic field in the contact cavity 311, and the magnetic flux lines in the magnetic field are parallel to the second direction. The current between the moving contact bridge 22 and the two stationary contacts 21 moves along the third direction, and the arc a also moves along the third direction. Fig.14 In the embodiment, the arc a between the left static contact 21 and the moving contact portion on the left side of the moving contact bridge 22 flows along the third direction away from the electromagnetic system 4, and the arc a moves along the first direction to the arc extinguishing chamber 34 under the action of the Lorentz force, that is, in Fig.14 In the embodiment, the arc a moves upward to the arc extinguishing chamber 34 on the side of the stationary contact 21, corresponding to Figure 8 Similarly, the arc a between the right static contact 21 and the moving contact portion on the right side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4, and the arc a moves along the first direction under the action of the Lorentz force, that is, in Fig.14 In the example, the arc a moves downward to the arc extinguishing chamber 34 below the right static contact 21, corresponding to Figure 8 In an arc extinguishing chamber 34 located on the right.

[0075] When the current direction in contact mechanism 2 is opposite, Fig.14 In the figure, the current between the left static contact 21 and the moving contact part on the left side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4, and the current between the right static contact 21 and the moving contact part on the right side of the moving contact bridge 22 flows along the third direction toward the electromagnetic system 4. The arc a at the two static contacts 21 moves along the first direction under the action of the Lorentz force, but the arc a at the two static contacts 21 move in opposite directions and enter two different arc extinguishing chambers 34, that is, the arc a at the left static contact 21 moves downward along the first direction, and the arc a at the right static contact 21 moves upward along the first direction.

[0076] It should be noted that in this embodiment, two sets of magnetic conductive components 33 can also be provided, and their assembly positions are the same as those in the first embodiment. The two sets of magnetic conductive components 33 can constrain the magnetic field, which is beneficial to enhancing the magnetic field strength corresponding to the static contact 21, but will not change the arc extinguishing principle.

[0077] Combination Figure 8 , 15 16 provide an embodiment of a third arc extinguishing system 3. This embodiment no longer has two sets of magnetic conductive components 33, and the rest of the structure is the same as the first embodiment. The movement principle of the arc a is the same as that of the first embodiment, but there is no magnetic conductive component 33 to constrain the magnetic flux lines of the magnetic field, and the arc extinguishing effect is slightly worse than that of the first embodiment.

[0078] like Figure 1 , 2 As shown in Figures 5-7, the DC switch is a relay, including a shell 1, wherein the shell 1 is preferably composed of an outer shell 11, an inner shell 12 and a cover 13, wherein the outer shell 11 is a hollow cylinder, the inner shell 12 is arranged in the outer shell 11, and the outer wall of the inner shell 12 is in contact with the inner wall of the outer shell 11, and the cover 13 covers the outer shell 11 and the inner shell 12 at the same time.

[0079] An electromagnetic system 4, a contact system and an arc extinguishing system 3 are arranged in the shell 1, wherein the electromagnetic system 4 is arranged in the inner shell 12, and the arc extinguishing system 3 adopts the structure in the above embodiment, and the arc extinguishing system 3 is arranged between the electromagnetic system 4 and the cover body 13 in the third direction, and the contact mechanism 2 of the contact system is arranged in the arc isolation cover 31 of the arc extinguishing system 3, and the moving contact bridge 22 and the static contact 21 in the contact mechanism 2 are located in the contact cavity 311 of the arc isolation cover 31, each static contact 21 is fixed on the cover body 13, and each static contact 21 is connected to a wiring assembly that passes through the cover body 13 and extends out of the shell 1, wherein the cover body 13 can be an integral structure, and can also include a plurality of cover bodies 13 stacked in the third direction.

[0080] The electromagnetic system 4 includes a coil assembly, which includes a coil frame and a driving member, wherein the coil frame is arranged along a third direction, one end of the coil frame is provided with a coil terminal for wiring, a coil is wound on the outside of the coil frame, and at least an armature is arranged in the central hole of the coil frame, the armature and the yoke fixed to the coil frame are spaced opposite to each other in the third direction, the driving member is connected to the armature and extends out of the coil frame along the third direction, the driving member can be directly connected to the moving contact bridge 22 through the linkage hole 316, or the driving member is connected to the transmission component 5, and the transmission component 5 is connected to the moving contact bridge 22 through the linkage hole 316. After the coil is energized or de-energized, the armature approaches or moves away from the yoke along the third direction under the drive of the coil, and the armature drives the driving member to move, thereby directly or indirectly driving the moving contact bridge 22 to approach or move away from the static contact 21, and a reaction spring can be sleeved on the outside of the driving member, and the two ends of the reaction spring are respectively in contact with the armature and the yoke, so as to reset the armature and the driving member.

[0081] It should be noted that the housing 1 , the electromagnetic system 4 , the transmission assembly 5 and the contact system in the DC switch can all adopt existing technologies, and the DC switch can also be configured with other accessory modules.

[0082] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0083] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc extinguishing system, comprising an arc isolation cover (31) and at least one pair of arc extinguishing magnets (32), each pair of arc extinguishing magnets (32) leaving a magnetic field space in a first direction, a contact mechanism (2) being arranged in the magnetic field space, the contact mechanism (2) comprising a moving contact bridge (22) and two stationary contacts (21), the moving contact bridge (22) being arranged along a second direction and moving in a third direction, so that two moving contact parts of the moving contact bridge (22) respectively cooperate with the two stationary contacts (21), the first direction, the second direction and the third direction being perpendicular to each other, characterized in that: Each arc-extinguishing magnet (32) has two magnetic poles at both ends, a connecting line between the two magnetic poles of the same arc-extinguishing magnet (32) is parallel to the second direction, and the same-sex magnetic poles of the same pair of arc-extinguishing magnets (32) face the same direction.

2. The arc extinguishing system according to claim 1, characterized in that: It also includes two groups of magnetic conductive components (33), each group of magnetic conductive components (33) is arranged in the magnetic field space and cooperates with a static contact (21), each group of magnetic conductive components (33) cooperates with adjacent arc-extinguishing magnets (32), each group of magnetic conductive components (33) includes two magnetic conductive parts, and the two magnetic conductive parts of the same group of magnetic conductive components (33) are arranged on opposite sides of a static contact (21) in the second direction.

3. The arc extinguishing system according to claim 2, characterized in that: The magnetic conductive member located between the two stationary contacts (21) is provided with a notch (330) for the moving contact bridge (22) to pass through, and the magnetic conductive member located outside the two stationary contacts (21) is respectively connected to the magnetic poles of adjacent arc-extinguishing magnets (32).

4. The arc extinguishing system according to claim 3, characterized in that: A notch (330) facing the third direction is formed on one side edge of the magnetic conductive member, and the notches (330) of two magnetic conductive members in the same group of magnetic conductive components (33) face away from each other.

5. The arc extinguishing system according to claim 4, characterized in that: The notch (330) of the magnetic conductive member located between the two stationary contacts (21) faces the direction of the closing movement of the moving contact bridge (22).

6. The arc extinguishing system according to claim 3, characterized in that: The plane where each magnetic conductive member is located is parallel to the third direction.

7. The arc extinguishing system according to claim 3, characterized in that: The magnetic conductive member is plugged into the arc isolation cover (31).

8. The arc extinguishing system according to any one of claims 2 to 7, characterized in that: It comprises a pair of arc-extinguishing magnets (32), wherein the same-sex magnetic poles of the pair of arc-extinguishing magnets (32) are connected to the same magnetic conductive member; or it comprises two pairs of arc-extinguishing magnets (32) spaced apart along a second direction, wherein one same-sex magnetic pole of the two pairs of arc-extinguishing magnets (32) is used to connect to the magnetic conductive member, and the other same-sex magnetic poles of the two pairs of arc-extinguishing magnets (32) are spaced apart and opposite to each other in the second direction.

9. The arc extinguishing system according to claim 8, characterized in that: It also includes an arc extinguishing chamber (34), wherein in a first direction, at least one arc extinguishing chamber (34) is provided on both sides of each stationary contact (21), and in a third direction, the arc extinguishing chamber (34) and the arc extinguishing magnet (32) located on the same side of the contact mechanism (2) are stacked.

10. A DC switch, comprising a housing (1), a contact mechanism (2) and an electromagnetic system (4) arranged in the housing (1), characterized in that: The housing (1) is also provided with an arc extinguishing system (3) as claimed in any one of claims 1 to 9, the contact mechanism (2) is arranged in an arc isolation cover (31) of the arc extinguishing system (3), and the arc extinguishing system (3) is drive-connected to the electromagnetic system (4) and arranged along a third direction.

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