An electromagnetic relay for preventing arc short circuit

Abstract

The present invention discloses an electromagnetic relay that prevents arc short circuits. The relay comprises a base, a magnetic circuit portion, and a contact portion. The base is provided with a first accommodating chamber, within which a plurality of partitions are provided, dividing the first accommodating chamber into a plurality of compartments. A first opening leading to each compartment is provided on the side of the first accommodating chamber. The contact portion comprises a plurality of contact units, each of which comprises a movable spring component and a static spring component mounted in a corresponding compartment. The armature of the magnetic circuit portion engages with each movable spring component via a push-pin. The relay also comprises a first arc-isolating plate that seals all or part of the first opening. The inner side of the first arc-isolating plate is provided with a plurality of first baffles. At least one first baffle is laterally inserted into each compartment, adjacent to or in contact with the partitions of the compartment, forming at least two arc-isolating walls between adjacent compartments. The present invention can prevent interphase arc short circuits caused by arcs generated by the disconnection of the movable and static spring components.

Description

Technical Field

[0001] The present invention relates to an electromagnetic relay, in particular to an electromagnetic relay capable of preventing arc short circuit. Background Art

[0002] An electromagnetic relay uses electromagnetic force to drive the relative motion of mechanical components to produce a predetermined response. It generally consists of a magnetic circuit, a moving spring, a stationary spring, a base, and a housing. The magnetic circuit includes an iron core, a coil bobbin wrapped with enameled wire, an armature, and a yoke. When current flows through the coil (i.e., the enameled wire), electromagnetic force is generated, attracting the armature, which contacts the pole surface at one end of the core, thereby driving the moving contact of the moving spring to contact or separate with the stationary contact of the stationary spring. When the current in the coil disappears, the electromagnetic force dissipates, causing the armature to reset and separate from the pole surface at one end of the core, causing the moving contact of the moving spring to separate from the stationary contact of the stationary spring. This contact or separation between the moving and stationary contacts opens or closes the circuit.

[0003] Some existing electromagnetic relays are equipped with multiple sets of contacts and are suitable for multi-phase circuits, such as three-phase alternating current. These contacts are typically located in separate compartments with side openings and enclosed by a housing. However, due to gaps between the partitions between the compartments and the housing, when these electromagnetic relays are used to switch multi-phase high currents (e.g., a three-phase 500A short-circuit current), arcs generated by contact interruption can easily enter adjacent compartments, causing arc shorts and even explosions. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art and provides an electromagnetic relay for preventing arc short circuit. The electromagnetic relay improves its structure to prevent arc short circuit caused by arc generated by contact disconnection.

[0005] The present invention solves the technical problem by adopting a technical solution: an electromagnetic relay for preventing arc short circuits, comprising a base, a magnetic circuit portion, a contact portion, and a push clip. The magnetic circuit portion is mounted on the base. The base is provided with a first accommodating chamber, wherein a plurality of partitions are provided within the first accommodating chamber to divide the first accommodating chamber into a plurality of compartments distributed along a preset direction. A first opening leading to each compartment is provided on a side surface of the first accommodating chamber. The contact portion includes a plurality of contact units corresponding to the plurality of compartments, each contact unit including a movable spring component and a stationary spring component, which are mounted in a corresponding compartment and engage with each other. An armature of the magnetic circuit portion engages with the movable spring component of each contact unit via the push clip. The relay also includes a first arc isolation plate, which seals all or part of the first opening. The inner side surface of the first arc isolation plate is provided with a plurality of first baffles distributed along the preset direction. At least one first baffle is laterally inserted into each compartment, and the first baffle is adjacent to or in contact with the partition of the compartment, forming at least two arc isolation walls between adjacent compartments.

[0006] Furthermore, the first accommodating chamber further includes a side surface provided with a second opening leading to each compartment, the second opening being located on opposite sides of the first accommodating chamber, and the first and second openings being arranged perpendicularly to the predetermined direction. The dynamic spring component is laterally mounted in the corresponding compartment from the first opening, and the static spring component is laterally mounted in the corresponding compartment from the second opening. Furthermore, the first arc-isolating plate further includes a second arc-isolating plate that seals all or part of the second opening, and a plurality of second baffles are arranged on the inner side surface of the second arc-isolating plate along the predetermined direction. At least one second baffle is laterally inserted into each compartment, and the second baffles are adjacent to or in contact with the compartment partitions, forming at least two arc-isolating walls between adjacent compartments. Furthermore, the first baffles of the first arc-isolating plate are laterally inserted into first slots provided in the corresponding compartments, and the plurality of first baffles of the second arc-isolating plate are grouped in pairs, with a second slot formed between the two first baffles in the same group, and the second slots are engaged with the partitions in the corresponding compartments.

[0007] Furthermore, the pushing card is arranged along the preset direction and cooperates with the first opening, and the first arc isolation plate is located below the pushing card; the first opening has a first arc blocking structure above the pushing card to limit the arc generated by the disconnection of the dynamic spring component and the static spring component from entering the adjacent compartment from the space above the pushing card.

[0008] Furthermore, it also includes a shell with an opening at the bottom, the bottom end of the shell is connected to the base, and the magnetic circuit part, contact part, push card and arc isolation plate are enclosed in its shell cavity; the first arc blocking structure includes a plurality of third baffles arranged at intervals along the preset direction on the inner side surface of the shell facing the first opening, the top of each third baffle is respectively connected to the inner top surface of the shell, and at least one third baffle is inserted downward from the top of each cavity, and the third baffle and the partition of the cavity are adjacent to or touch each other at the part above the push card, forming at least two arc isolation walls located between the upper parts of adjacent cavities.

[0009] Furthermore, the parts of the several partitions close to the first opening are respectively provided with a clearance notch for avoiding the push card; at least one side of each partition is respectively provided with a second arc blocking structure to limit the arc generated by the disconnection of the dynamic spring component and the static spring component from entering the adjacent compartment through the gap between the clearance notch and the push card.

[0010] Furthermore, the second arc baffle structure includes an upper baffle and a lower baffle arranged on the same side of the partition, the upper baffle is fitted above the push card, and the lower baffle is fitted below the push card, and the ends of the upper baffle and the lower baffle away from the partition are respectively inclined toward the direction of the push card; the second arc baffle structure also includes a side baffle, which is located on the inner side of the push card, and the upper end of the side baffle is connected to the upper baffle, and the lower end of the side baffle is connected to the lower baffle.

[0011] Furthermore, a plurality of arc-blocking portions are provided on the top of the inner side surface of the first arc-isolating plate, the bottom end of each arc-blocking portion is respectively connected to the top end of the plurality of first baffles of the first arc-isolating plate, and the top end of each arc-blocking portion extends in the direction of the push card; the longitudinal section of the arc-blocking portion in the preset direction is an inverted T-shape.

[0012] Furthermore, the inner side surface of the second arc isolation plate is provided with a plurality of fourth baffles distributed along the preset direction, and at least one fourth baffle is laterally inserted into each compartment.

[0013] Furthermore, the base is also provided with a second accommodating cavity leading out of the upper end, the magnetic circuit part includes a coil assembly and the armature, the coil assembly is arranged in the second accommodating cavity, the armature is located outside the second accommodating cavity, and is arranged at one end of the base in the preset direction; the first accommodating cavity and the second accommodating cavity are separated in a direction perpendicular to the preset direction, and the second opening is located below the second accommodating cavity; the dynamic spring component includes a dynamic spring lead-out piece, a rigid spring piece, a flexible connector and a reaction spring piece, the dynamic spring lead-out piece is laterally inserted into the corresponding partition cavity, the top of the rigid spring piece is rotatably connected to the top of the dynamic spring lead-out piece, and a flexible connector is connected between the top of the rigid spring piece and the top of the dynamic spring lead-out piece; the bottom of the rigid spring piece A moving contact is provided on the side of the part facing away from the moving spring lead-out piece; the reaction spring is located between the moving spring lead-out piece and the rigid spring, and the bottom of the reaction spring is fixedly connected to the rigid spring, and a preset distance is provided between the top of the reaction spring and the rigid spring; the pushing card is provided with a plurality of card slots distributed along the preset direction and corresponding to the moving spring component one by one, and the rigid spring and the reaction spring of each moving spring component are respectively clamped in the corresponding card slots; it also includes an auxiliary moving spring provided with an auxiliary moving contact and an auxiliary static spring provided with an auxiliary static contact, which are respectively inserted into the base and located on the side where the armature is located; the pushing card is provided with a driving part on the end facing the armature, and the driving part cooperates with the auxiliary moving spring to drive the auxiliary moving spring to move.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Because the present invention also includes a first arc-isolating plate that seals all or part of the first opening, and a plurality of first baffles are provided on the inner side of the first arc-isolating plate, at least one first baffle is laterally inserted into each compartment, and the first baffles are adjacent to or in contact with the compartment partitions, forming at least two arc-isolating walls between adjacent compartments. This prevents arcs generated by the disconnection of the dynamic and static spring components from flowing from the first opening to adjacent compartments and causing arc short circuits. In particular, the at least two arc-isolating walls complement each other, providing a good arc-isolating effect and requiring low machining precision for the partitions, the first arc-isolating plate, and the first baffles.

[0016] 2. The first accommodating chamber also includes a second opening on its side, allowing the dynamic and static spring components to be installed separately from opposite sides of the base. This ensures sufficient creepage distance between the lead pins of the dynamic and static spring components within a limited space to meet operational requirements. The present invention also includes a second arc-isolating plate, which prevents arcs generated by the disconnection of the dynamic and static spring components from escaping from the second opening to adjacent cavities and causing short circuits, thereby ensuring the relative sealing of each cavity.

[0017] 3. The push card is positioned along the preset direction and fits within the first opening, making it easier to install. It also ensures that the force points between the push card and the dynamic spring component and between the push card and the armature are aligned, or substantially aligned, in a straight line. This reduces deformation of the push card during operation and ensures that the service life of the electromagnetic relay is not reduced due to quality issues with the push card. Furthermore, the first opening includes a first arc-blocking structure above the push card to prevent arcs generated by the disconnection of the dynamic and static spring components from entering adjacent compartments from the space above the push card. This ensures the relative sealing of each compartment when the push card is mounted externally.

[0018] 4. The first arc-blocking structure includes a plurality of third baffles arranged at intervals along the preset direction on the inner side surface of the shell facing the first opening, the top of each third baffle being respectively in contact with the inner top surface of the shell, and at least one third baffle being inserted downwardly into the top of each compartment, and the third baffles and the partitions of the compartment are adjacent to or in contact with each other at the portion above the push card, forming at least two arc-blocking walls located between the upper portions of adjacent compartments. This not only enables the third baffles to effectively seal the gap between the portion of the partition above the push card and the shell, but also enables the present invention to reduce the assembly of one component, thereby simplifying the assembly steps.

[0019] 5. The second arc-blocking structure is provided on at least one side of the partition plate to prevent arcs generated by the disconnection of the dynamic and static spring components from entering adjacent compartments through the gap between the clearance notch and the pusher, thereby further improving the arc-isolating performance of the present invention. The arc-blocking portions are provided on the top inner side of the first arc-isolating plate to further prevent arcs from entering adjacent compartments through the gap between the clearance notch and the pusher, thereby further improving the arc-isolating performance of the present invention.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay for preventing arc short circuit of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an exploded schematic diagram of the first embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the base of the present invention in Example 1 Figure 1 (Reflecting the first opening);

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the base of the present invention in Example 1 Figure 2 (Embodying the second opening);

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the first arc isolation plate of the present invention in Example 1 Figure 1(Reflects the inner side);

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the first arc isolation plate of the present invention in Example 1 Figure 2 (Reflect the outer side);

[0026] Figure 6 This is a schematic diagram of the three-dimensional structure of the second arc isolation plate of the present invention in Example 1 Figure 1 (Reflects the inner side);

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the second arc isolation plate of the present invention in Example 1 Figure 2 (Reflect the outer side);

[0028] Figure 8 1 is a schematic diagram of the three-dimensional structure of the housing of the present invention in Example 1 (embodying the third baffle);

[0029] Figure 9 This is a schematic diagram of the three-dimensional structure of the base after the magnetic circuit part and the contact part are installed in the embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the three-dimensional structure of the base after the magnetic circuit part, contact part, and push card are installed in the embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the three-dimensional structure of the base after the first arc isolation plate and the like are installed in the embodiment of the present invention. Figure 1 (Reflecting the positive);

[0032] Figure 12 This is a schematic diagram of the three-dimensional structure of the base of the present invention after the arc isolation plate and the like are installed. Figure 1 (Reflect the back);

[0033] Figure 13 This is a schematic diagram of the three-dimensional structure of the base after installing two arc isolation plates and the like according to the first embodiment of the present invention;

[0034] Figure 14 This is a top view of the base of the first embodiment of the present invention after installing two arc isolation plates, etc.;

[0035] Figure 15 This is a side view of the base of the first embodiment of the present invention after installing two arc isolation plates;

[0036] Figure 16 This is a schematic diagram of the three-dimensional structure of the present invention in Example 1;

[0037] Figure 17 This is a cross-sectional view of the embodiment of the present invention Figure 1

[0038] Figure 18 This is a cross-sectional view of the embodiment of the present invention Figure 2 ;

[0039] Figure 19 This is a cross-sectional view of the embodiment of the present invention Figure 3 ;

[0040] Figure 20 This is a cross-sectional view of the embodiment of the present invention Figure 4 ;

[0041] Figure 21 2 is a schematic diagram of the three-dimensional structure of the second arc isolation plate of the present invention in accordance with the second embodiment;

[0042] Figure 22 It is a cross-sectional view of the second embodiment of the present invention. DETAILED DESCRIPTION

[0043] Example 1

[0044] See Figures 1-20 As shown, an electromagnetic relay for preventing arc short circuit of the present invention includes a housing 1 with an opening at the bottom, a base 2, a magnetic circuit portion 3, a contact portion and a push card 4. The magnetic circuit portion 3 is horizontally mounted on the base 2; the base 2 is provided with a first accommodating chamber 21 of the contact portion, and a plurality of partitions 211 are provided in the first accommodating chamber 21 to divide the first accommodating chamber 21 into a plurality of compartments 212 distributed along a preset direction. A first opening 213 leading to each compartment 212 is provided on a side of the first accommodating chamber 21; the contact portion includes a plurality of contact units corresponding to the plurality of compartments 212, each contact unit respectively including a movable spring component 5 and a static spring component 6, which are installed in the corresponding compartment 212 and cooperate with each other; the armature 34 of the magnetic circuit portion 3 cooperates with the movable spring component 5 of each contact unit through the push card 4. The present invention also includes a first arc-isolating plate 8, which seals all or part of the first opening 213. The inner side of the first arc-isolating plate 8 is provided with a plurality of first baffles 81 distributed along the preset direction. Each first baffle 81 is vertical, and at least one first baffle 81 is laterally inserted into each compartment 212. The first baffles 81 are adjacent to or in contact with the baffles 211 of the compartment 212, forming at least two arc-isolating walls between adjacent compartments. The bottom end of the outer shell 1 is connected to the base 2, and the magnetic circuit portion, contact portion, push card 4, and first arc-isolating plate 8 are contained within its shell cavity. The preset direction is specifically the length direction of the base 2, but is not limited thereto. In other embodiments, the preset direction is the width direction of the base. The magnetic circuit portion 3 lies on the base 2 along the preset direction. The inner side of the first arc-isolating plate 8 refers to the side of the first arc-isolating plate 8 facing the interior of the first accommodating cavity.

[0045] In this embodiment, the first accommodating chamber 21 is further provided with a side surface of a second opening 215 leading to each compartment 212. The second opening 215 and the first opening 213 are located on opposite sides of the first accommodating chamber 21, and the first and second openings 213 and 215 are arranged perpendicular to the predetermined direction. The dynamic spring component 5 is installed laterally into the corresponding compartment from the first opening 213, and the static spring component 6 is installed laterally into the corresponding compartment from the second opening 215. This ensures that the lead pins of the dynamic spring component 5 and the lead pins of the static spring component 6 located below the base 2 are spaced apart from each other, ensuring that the air gap between them meets the required operating requirements. The present invention also includes a second arc-isolating plate 9, which seals the second opening 215. The inner surface of the second arc-isolating plate 9 is provided with a plurality of second baffles 91 distributed along the predetermined direction. At least one second baffle 91 is laterally inserted into each compartment, and the second baffles 91 are adjacent to or in contact with the compartment baffles 211, forming at least two arc-isolating walls between adjacent compartments. The second arc isolation plate 9 is located within the housing 1. The inner side of the second arc isolation plate 9 refers to the side of the second arc isolation plate 9 facing the interior of the first accommodating cavity. In other embodiments, the present invention does not provide the second opening, and the dynamic spring component and the static spring component are both installed in the corresponding compartment through the first opening.

[0046] In this embodiment, the first baffles 81 of the first arc-isolating plate 8 are laterally inserted into the first slots 214 provided in the corresponding compartments. The second baffles 91 of the second arc-isolating plate 9 are grouped in pairs, with second slots 92 formed between the two second baffles 91 in the same group. These second slots 92 engage with the baffles 211 in the corresponding compartments. This allows for lateral insertion of the first and second arc-isolating plates 8 and 9, providing pre-positioning. The first and second arc-isolating plates 8 and 9 can be further secured to the base 2 with adhesive around their perimeters or portions thereof, and sealing ribs 83 and 93 can be provided all or partially around the inner sides of the first and second arc-isolating plates 8 and 9. This ensures the stability of the first and second arc-isolating plates 8 and 9 and further prevents arc leakage.

[0047] In this embodiment, the push card 4 is arranged along the preset direction and fits in the first opening 213. This not only makes the push card 4 easier to install, but also enables the force points of the push card 4 and the dynamic spring component 5 and the force points of the push card 4 and the armature 34 to be located on or substantially on the same straight line, making it less likely for the push card 4 to deform during operation and ensuring that the service life of the entire electromagnetic relay will not be reduced due to quality problems of the push card 4. Specifically, the push card 4 is roughly located in the middle of the first opening 213, and the first arc isolation plate 8 is located below the push card 4. Therefore, the first arc isolation plate 8 seals the lower part of the first opening 213, and the second arc isolation plate 9 seals the entire second opening 215. The first opening 213 has a first arc blocking structure above the push card 4 to limit the arc generated by the disconnection of the dynamic spring component 5 and the static spring component 6 from entering the adjacent compartment from the space above the push card 4. In other embodiments, the push card is fitted on the inner side of each dynamic spring component, or the push card is located on the inner side of the first arc isolation plate. In this case, the first arc isolation plate can be further enlarged and the first opening can be closed, thereby eliminating the first arc blocking structure.

[0048] In this embodiment, Figure 8 As shown, the first arc-blocking structure includes a plurality of third baffles 11 spaced along the preset direction on the inner side surface of the housing 1 facing the first opening 213. The top of each third baffle 11 is in contact with the inner top surface of the housing 1. At least one third baffle 11 is inserted downwardly from the top of each compartment, and the third baffle 11 and the compartment partition 211 are adjacent to or touch each other at the portion above the push card 4, forming at least two arc-blocking walls located between the upper portions of adjacent compartments. The plurality of third baffles 11 are respectively inserted downwardly into third slots 217 provided in the upper portions of the corresponding compartments. Therefore, the top wall of each compartment 212 is provided with a clearance notch 216 to avoid the downward insertion of the third baffle 11. In other embodiments, the first arc-blocking structure and the housing are separate components, and the first arc-blocking structure includes a third arc-blocking plate, and the plurality of third baffles are provided on the inner side of the third arc-blocking plate, which seals the portion of the first opening above the push card.

[0049] In this embodiment, the portions of the partitions 211 close to the first opening 213 are respectively provided with clearance notches 2111 for avoiding the push card 4, and at least one side of each partition 211 is respectively provided with a second arc blocking structure to limit the arc generated by the disconnection of the dynamic spring component 5 and the static spring component 6 from entering the adjacent compartment through the gap between the clearance notch 2111 and the push card 4.

[0050] In this embodiment, Figure 2As shown, the second arc-blocking structure includes an upper baffle 2112 and a lower baffle 2113 disposed on the same side of the compartment 212. The upper baffle 2112 is generally Z-shaped and fits above the push card 4. The lower baffle 2113 is inclined and fits below the push card 4. The ends of the upper baffle 2112 and the lower baffle 2113 away from the partition 211 are respectively inclined toward the push card 4. The ends of the upper baffle 2112 and the lower baffle 2113 away from the first opening 213 are respectively connected to the inner side surface of the compartment 212. The second arc-blocking structure further includes a side baffle 2114, which is located inside the push card 4, and the upper end of the side baffle 2114 is connected to the upper baffle 2112, and the lower end of the side baffle 2114 is connected to the lower baffle 2113; the end of the side baffle 2114 facing away from the push card 4 is respectively connected to the inner side surface of the compartment 212. The cross section of the push card 4 is a horizontal T-shape, as shown in FIG. Figure 17 As shown, the upper baffle 2112 and the lower baffle 2113 are respectively located at the upper and lower sides of the portion of the push card 3 corresponding to the horizontal portion of the horizontal T-shape.

[0051] In this embodiment, a plurality of arc-blocking portions 82 are provided on the top of the inner side surface of the first arc-isolating plate 8, and the bottom end of each arc-blocking portion 82 is respectively connected to the top end of the plurality of first baffles of the first arc-isolating plate 8, and the top end of each arc-blocking portion 82 extends in the direction of the push card 4 and is located below the lower baffle 2113; the longitudinal section of the arc-blocking portion 82 in the preset direction is an inverted T-shape.

[0052] In this embodiment, the base 2 further includes a second accommodating chamber 22 extending from its upper end. The magnetic circuit portion 3 includes a coil assembly and an armature 34. The coil assembly is horizontally disposed within the second accommodating chamber 22. The armature 34 is located outside the second accommodating chamber 22 and is disposed at one end of the base 2 in the predetermined direction. The first accommodating chamber 21 and the second accommodating chamber 22 are separated in a direction perpendicular to the predetermined direction (i.e., the width direction of the base 2). The second opening 215 is located below the second accommodating chamber 22.

[0053] In this embodiment, the coil assembly of the magnetic circuit part 3 includes a coil frame 31, an iron core 35, an enameled wire 32, and a yoke 33. The iron core 35 is inserted into the coil frame 31, and its two ends are exposed. The enameled wire 32 is wound around the outside of the coil frame 31. The yoke 33 is L-shaped, one side of which is fixedly connected to the end of the iron core 35 away from the armature 34 (or it can be formed as one piece), and the other side is fitted on the side of the coil frame 31 after the enameled wire 32 is wound. The armature 34 is specifically limited to the blade edge of the other side of the yoke 33 by the restoring spring 10. The armature 34 is roughly in the shape of a line, and the part of the armature 34 that fits with the pole surface of the iron core 35 is bent into an inclined shape toward the side away from the iron core 35. In this way, the rotation angle of the armature 34 is larger, so that the stroke of the push card 4 is larger, and therefore, the contact gap between the dynamic spring component 5 and the static spring component 6 in the disconnected state is larger, thereby improving the safety performance of the present invention in the disconnected state. In this embodiment, as Figure 9 As shown, the dynamic spring component 5 is configured to have a short-circuit current resistant structure, which includes a dynamic spring lead-out piece 51, a rigid spring piece 52, a flexible connector 53 and a reaction spring piece 54. The dynamic spring lead-out piece 51 is inserted into the base 2 from the side of the first opening 213, and its bottom is located below the base 2 and forms the lead-out foot of the dynamic spring component 5. The top of the rigid spring piece 52 is rotatably connected to the top of the dynamic spring lead-out piece 51, so that the rigid spring piece 52 can rotate in a direction away from or close to the dynamic spring lead-out piece 51. The top of the rigid spring piece 52 and the top of the dynamic spring lead-out piece 51 are connected. A flexible connector 53 is also connected. A dynamic contact 55 is provided on the bottom of the rigid spring 52, facing away from the dynamic spring lead-out piece 51. A reaction spring 54 is located between the dynamic spring lead-out piece 51 and the rigid spring 52. The bottom of the reaction spring 54 is fixedly connected to the rigid spring 52, and a predetermined distance is provided between the top of the reaction spring 54 and the rigid spring 52. The push card 4 is provided with a plurality of slots distributed along the predetermined direction and corresponding to the dynamic spring components 5. The rigid spring 52 and reaction spring 54 of each dynamic spring component 5 are respectively engaged in the corresponding slots. In this way, the push card 4 drives the rigid spring 52 toward the static spring portion by pushing the reaction spring 54, thereby generating an overtravel. The static spring component 6 includes a static spring 61 and a static contact 62 provided at one end of the static spring 61. The other end of the static spring 61 has an integrally formed lead pin.

[0054] In this embodiment, the present invention includes a plurality of limiters 7, which limit the push card 4 from sliding out of the first opening 213. Each limiter 7 is roughly in the shape of a letter "ㄈ", with its middle side located outside the push card 4, and its remaining two sides respectively fitting on the upper and lower sides of the push card 4 and being inserted into the corresponding sockets provided on the partition 211. The top of the first arc isolation plate 8 is provided with a clearance notch 83 for avoiding the location of each limiter 7. Figure 4 、 Figure 5As shown, the bottom of the arc isolation plate 8 is provided with a plurality of first grooves 84 spaced apart along the preset direction. These first grooves 84 engage with the plurality of first protrusions 23 protruding outward from the bottom of the first opening 213 of the base 2 one by one, thereby pre-positioning the first arc isolation plate 8. Similarly, the bottom of the second arc isolation plate 9 is also provided with a plurality of second grooves 93 spaced apart along the preset direction. These second grooves 93 engage with the plurality of second protrusions 24 protruding outward from the bottom of the second opening 215 of the base 2 one by one, thereby pre-positioning the second arc isolation plate 9.

[0055] In this embodiment, Figure 13 、 Figure 15 As shown, the present invention further includes an auxiliary movable spring 20 with an auxiliary movable contact and an auxiliary static spring 30 with an auxiliary static contact, each of which is inserted into the base 2 and located on the side where the armature 34 is located. The push card 4 has a driving portion 41 on the end facing the armature 34. This driving portion 41 cooperates with the auxiliary movable spring 20 to drive the auxiliary movable spring 20. The operating state of the auxiliary movable spring 20 is opposite to that of the movable spring component 5. That is, when the movable spring component 5 moves in the closing direction, the auxiliary movable spring 20 moves in the opening direction, and when the movable spring component 5 moves in the opening direction, the auxiliary movable spring 20 moves in the closing direction.

[0056] The present invention provides an arc short-circuit-proof electromagnetic relay, specifically, but not limited to, four contact units. Therefore, the present invention can be applied to a three-phase four-wire circuit. Each set of contact units can have a current carrying capacity of up to 40A, and can withstand a short-circuit current of 3kA.

[0057] The operating principle of the present invention is as follows: when the coil (i.e., enameled wire 32) is energized, the armature 34 rotates around the blade of the yoke 33, engaging the pole surface of the core 35. This simultaneously drives the pusher 4 to move along the length of the base 2, and drives the reaction spring 54 and the rigid spring 52 of the dynamic spring component 5 to move, thereby connecting the moving contact 55 with the static contact 62. When the moving contact 55 and the static contact 62 first come into contact, the reaction spring 54 begins to deform. Once the armature 34 and the pole surface of the core 35 are fully in contact, the reaction spring 54 deformation ends. Overtravel is primarily caused by the elastic deformation of the reaction spring 54. The rigid spring 52 is only responsible for conducting current and does not deform to achieve the overtravel function. When the coil (i.e., the enameled wire 32) is de-energized, the armature 34 resets under the action of the restoring spring, simultaneously driving the pusher 4 in the opposite direction and the reaction springs 54 and rigid springs 52 of each movable spring assembly 5 in the opposite direction, disconnecting the movable contacts 55 from the stationary contacts 62. If the movable contacts 55 of one set of movable spring assemblies 5 become stuck to the corresponding stationary contacts 62, the pusher 4 cannot reset, and the movable contacts 55 of the remaining sets of movable spring assemblies 5 cannot disconnect from the corresponding stationary contacts 62, thereby providing a forced guide function.

[0058] The auxiliary movable contact and the auxiliary static contact are disconnected by the drive unit 41 of the push card 4 pushing the head of the auxiliary movable spring 20. The auxiliary movable contact and the auxiliary static contact are connected by the reaction force of the auxiliary movable spring 20. The auxiliary contact is highly insulated from the main contact (i.e., the contact unit). The auxiliary contact monitors the status of the main contact. If either main contact becomes stuck, the auxiliary contact cannot close, thus achieving a latching function.

[0059] When a short-circuit current occurs, a Holm force is generated on the surfaces of the moving contact 55 and the static contact 62, which causes the moving contact 55 and the static contact 62 to repel each other; a Lorentz force is generated in the U-shaped structure composed of the moving spring lead-out piece 51, the rigid spring piece 52 and the flexible connector 53, which prompts the moving contact 55 to move toward the static contact 62, thereby limiting the repulsion of the moving contact 55 and the static contact 62.

[0060] In an electromagnetic relay for preventing arc short circuits according to the present invention, on the side where the dynamic spring component 5 is located, the first baffle 81 of the first arc isolation plate 8 and the partition 211 form two arc isolation walls located at the lower portion of the compartment cavity, and the third baffle 11 on the inner side of the housing and the partition 211 form two arc isolation walls located at the upper portion of the compartment cavity. Combined with the design of the upper baffle 2112, the lower baffle 2113 and the arc blocking portion 82, the present invention is equivalent to forming two large arc isolation walls A and B on the side where the dynamic spring component 5 is located, which can completely separate adjacent arc isolation cavities. Figure 19As shown in the figure, the lines indicated by A and B respectively indicate the direction of the large arc isolation walls A and B. On the side where the static spring component 6 is located, since there is no push card installed and the second opening is small, it is completely closed by the second arc isolation plate 9. The second baffle 91 of the second arc isolation plate 9 and the partition 211 form three small arc isolation walls C, D, and E, as shown in FIG. Figure 20 As shown. Therefore, each compartment 212 of the present invention is relatively closed, and the two large arc-isolating walls A and B / three small arc-isolating walls C, D, and E complement each other. Even if one large arc-isolating wall / small arc-isolating wall fails to isolate the arc effectively, the remaining large arc-isolating walls / small arc-isolating walls can further isolate the arc. When the dynamic spring component 5 and the static spring component 6 disconnect and generate an arc, the arc will not enter the adjacent compartment 212, thereby preventing an arc short circuit and ensuring the safety of the present invention.

[0061] In the arc relay for preventing arc short circuit of the present invention, the first arc isolation plate 8 and the second arc isolation plate 9 are both inserted sideways, which makes the assembly sequence simple and easy to realize automation. In particular, the first baffle 81 of the first arc isolation plate 8 / the second baffle 91 of the second arc isolation plate 9 / and the partition 211 are inserted into each other, so that the sealing method between the first arc isolation plate 8 / the second arc isolation plate 9 and the partition 211 is simple and ensures that there is no arc leakage gap. Its third baffle 11 is directly formed on the shell 1, so that the present invention can reduce the steps of assembling the third baffle 11, thereby simplifying the assembly steps. Similarly, the third baffle 11 and the partition 211 are inserted into each other, ensuring that there is no arc leakage gap between the inner side of the shell 1 and the partition 211. The provision of the second arc blocking structure and / or the arc blocking portion 82 can ensure that there is no arc leakage gap between adjacent compartments 212 at the said clearance notch 2111, further improving the arc isolation effect of the present invention.

[0062] Example 2

[0063] See Figure 21 、 Figure 22 As shown, the present invention's arc short-circuit-proof electromagnetic relay differs from the aforementioned first embodiment in that the inner side surface of the second arc-isolating plate 9 is further provided with a plurality of vertical fourth baffles 94 spaced apart along the predetermined direction, with at least one fourth baffle 94 laterally inserted into each compartment 212. Specifically, two fourth baffles 94 are laterally inserted into each compartment 212. The fourth baffles 94 are larger in the depth direction of the second opening 215 than the first baffle 91 in the depth direction of the second opening 215. These fourth baffles 94 can be used to increase the creepage distance between the dynamic spring component 5 and the static spring component 6, thereby improving the insulation performance of the present invention.

[0064] The above embodiments are only used to further illustrate an arc short-circuit-proof electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay for arc short circuit prevention, comprising a base, a magnetic circuit portion, a contact portion, and a push card, wherein the magnetic circuit portion is mounted on the base; the base is provided with a first accommodating chamber, wherein a plurality of partitions are provided within the first accommodating chamber to divide the first accommodating chamber into a plurality of compartments distributed along a preset direction, and a first opening leading to each compartment is provided on a side surface of the first accommodating chamber; the contact portion includes a plurality of contact units corresponding one-to-one to the plurality of compartments, each contact unit comprising a movable spring component and a static spring component, the movable spring component and the static spring component being mounted in a corresponding compartment and engaging with each other; an armature of the magnetic circuit portion engages with the movable spring component of each contact unit via the push card; and the relay is characterized in that: It also includes a first arc isolation plate, which seals all or part of the first opening, and the inner side of the first arc isolation plate is provided with a plurality of first baffles distributed along the preset direction, at least one first baffle is inserted laterally into each compartment, and the first baffle is adjacent to or touches the partition of the compartment to form at least two arc isolation walls between adjacent compartments; the pushing card is arranged along the preset direction and cooperates at the first opening, and the first arc isolation plate is located below the pushing card; the first opening has a first arc blocking structure at the position above the pushing card to limit the arc generated by the disconnection of the dynamic spring component and the static spring component from entering the adjacent compartment from the space above the pushing card.

2. The arc short circuit proof electromagnetic relay according to claim 1, characterized in that: The side of the first accommodating chamber is further provided with a second opening leading to each compartment, the second opening and the first opening are located on two sides opposite to each other in the first accommodating chamber, and the distribution direction of the first opening and the second opening is perpendicular to the preset direction; the dynamic spring component is installed in the corresponding compartment from the side of the first opening, and the static spring component is installed in the corresponding compartment from the side of the second opening; It also includes a second arc isolation plate, which seals all or part of the second opening, and the inner side of the second arc isolation plate is provided with a plurality of second baffles distributed along the preset direction, at least one second baffle is laterally inserted into each cavity, and the second baffle is adjacent to or touches the partition of the cavity, forming at least two arc isolation walls between adjacent cavities.

3. The arc short circuit proof electromagnetic relay according to claim 2, characterized in that: The first baffles of the first arc isolation plate are laterally inserted into the first slots provided in the corresponding compartments, and the second baffles of the second arc isolation plate are grouped in pairs, and a second slot is formed between the two second baffles in the same group, and the second slot is inserted and matched with the partition in the corresponding compartment.

4. The arc short circuit proof electromagnetic relay according to claim 1, characterized in that: It also includes a shell with an open bottom end, the shell is connected to the base and contains the magnetic circuit part, the contact part, the push card and the first arc isolation plate in its shell cavity; The first arc-blocking structure includes a plurality of third baffles arranged at intervals along the preset direction on the inner side surface of the shell facing the first opening, the top of each third baffle being respectively connected to the inner top surface of the shell, at least one third baffle being inserted downwardly from the top of each compartment, and the third baffle and the partition of the compartment being adjacent to or touching each other at the part above the push card, forming at least two arc-blocking walls located between the upper parts of adjacent compartments.

5. The arc short circuit proof electromagnetic relay according to claim 1, characterized in that: The parts of the several partitions close to the first opening are respectively provided with a clearance notch for avoiding the push card; at least one side of each partition is respectively provided with a second arc blocking structure to limit the arc generated by the disconnection of the dynamic spring component and the static spring component from entering the adjacent cavity through the gap between the clearance notch and the push card.

6. The arc short circuit proof electromagnetic relay according to claim 5, characterized in that: The second arc baffle structure includes an upper baffle and a lower baffle arranged on the same side of the partition, the upper baffle is fitted above the push card, and the lower baffle is fitted below the push card, and the ends of the upper baffle and the lower baffle away from the partition are respectively inclined toward the direction of the push card; the second arc baffle structure also includes a side baffle, which is located on the inner side of the push card, and the upper end of the side baffle is connected to the upper baffle, and the lower end of the side baffle is connected to the lower baffle.

7. The arc short circuit proof electromagnetic relay according to claim 5, characterized in that: A plurality of arc-blocking portions are provided on the top of the inner side surface of the first arc-isolating plate, the bottom end of each arc-blocking portion is respectively connected to the top end of the plurality of first baffles of the first arc-isolating plate, and the top end of each arc-blocking portion extends in the direction of the push card; the longitudinal section of the arc-blocking portion in the preset direction is an inverted T-shape.

8. The arc short circuit proof electromagnetic relay according to claim 2 or 3, characterized in that: The inner side surface of the second arc isolation plate is provided with a plurality of fourth baffles distributed along the preset direction, and at least one fourth baffle is laterally inserted into each compartment.

9. The arc short circuit proof electromagnetic relay according to claim 2 or 3, characterized in that: The base is also provided with a second accommodating cavity extending from the upper end, the magnetic circuit portion includes a coil assembly and the armature, the coil assembly is horizontally arranged in the second accommodating cavity, the armature is located outside the second accommodating cavity, and is arranged at one end of the base in the preset direction; the first accommodating cavity and the second accommodating cavity are separated in a direction perpendicular to the preset direction, and the second opening is located below the second accommodating cavity; the dynamic spring component includes a dynamic spring lead-out piece, a rigid spring piece, a flexible connector and a reaction spring piece, the dynamic spring lead-out piece is laterally inserted into the corresponding compartment, the top of the rigid spring piece is rotatably connected to the top of the dynamic spring lead-out piece, and a flexible connector is connected between the top of the rigid spring piece and the top of the dynamic spring lead-out piece; the bottom of the rigid spring piece A dynamic contact is provided on the side facing away from the dynamic spring lead-out piece; the reaction spring is located between the dynamic spring lead-out piece and the rigid spring, and the bottom of the reaction spring is fixedly connected to the rigid spring, and a preset distance is provided between the top of the reaction spring and the rigid spring; the push card is provided with a plurality of card slots distributed along the preset direction and corresponding to the dynamic spring components one by one, and the rigid spring and reaction spring of each dynamic spring component are respectively clamped in the corresponding card slots; it also includes an auxiliary dynamic spring provided with an auxiliary dynamic contact and an auxiliary static spring provided with an auxiliary static contact, which are respectively inserted into the base and located on the side where the armature is located; the push card is provided with a driving part on the end facing the armature, and the driving part cooperates with the auxiliary dynamic spring to drive the auxiliary dynamic spring to move.

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