Electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, which comprises a contact assembly and an arc extinguishing permanent magnet arranged on the outer side of the contact assembly. The contact assembly comprises two reeds, one reed is a static reed and is provided with a static contact, the other reed is a movable reed and is provided with a movable contact, and the static contact is matched with the movable contact; at least one reed is provided with an insulated arc-isolating member, and the arc-isolating member isolates an electric arc generated by breaking of the contact assembly from the reed where the arc-isolating member is located in the arc blowing direction of the arc extinguishing permanent magnet. According to the utility model, the arc extinguishing requirement can be met on the basis of miniaturization and microminiaturization of a relay product, so that the product quality is improved, and the service life of the product is prolonged. According to the utility model, the arc-isolating member made of a proper material can be selected according to the magnitude of the load current, so that the arc-isolating effect of the arc-isolating member is matched with the magnitude of the load, and the arc-isolating member can still effectively isolate the arc when the load is relatively large.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to an electromagnetic relay. Background Art

[0002] An electromagnetic relay is an electronic control device that is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] In applications such as photovoltaics and charging piles, as DC loads become larger and larger, it is difficult to rely solely on contact disconnection to extinguish the arc naturally. Magnetic blowout is usually used to extinguish the arc, that is, a permanent magnet is set on the outside of the contact, and the magnetic field of the permanent magnet is used to exert force on the charged ions to stretch and move the arc away from the contact, thereby achieving the effect of rapid arc extinguishing. Since the contacts of the product are riveted to the load terminals (i.e., the dynamic spring / static spring), the arc will be elongated and moved close to the load terminals. When the distance between the load terminals is very small and the potential difference for the arc to continue burning is met, the arc root will transfer from the contacts to the terminals and continue to burn, resulting in the inability to extinguish the arc, causing serious problems such as contact burning and product failure. As the size of relays continues to shrink, the distance between the load terminals is also getting smaller and smaller. Therefore, there is an urgent need to make further improvements to the existing product structure to meet the arc extinguishing requirements of the product while meeting the miniaturization and micro-miniaturization of the product. Utility Model Content

[0004] The utility model aims at the technical problems existing in the prior art and provides an electromagnetic relay, which solves the problem that the relay is difficult to meet the arc extinguishing requirement while being miniaturized through structural improvement.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an electromagnetic relay, including a contact assembly and an arc-extinguishing permanent magnet, the arc-extinguishing permanent magnet is arranged on the outside of the contact assembly; the contact assembly includes two reeds, one of which is a static reed and is provided with a static contact, and the other reed is a dynamic reed and is provided with a dynamic contact, and the static contact and the dynamic contact cooperate with each other; an insulating arc-isolating member is installed on at least one reed, and the arc-isolating member isolates the arc generated by the disconnection of the contact assembly in the arc blowing direction of the arc-extinguishing permanent magnet from the reed where the arc-isolating member is located.

[0006] Furthermore, the arc-isolating member is tightly fitted with the spring sheet on which it is located; the arc-isolating member is fixedly connected to the spring sheet on which it is located or is detachably connected, and the connection method includes one or more of plug-in, interference fit, glue bonding, snap connection, and hot riveting.

[0007] Furthermore, the arc isolation member includes a main baffle, which is fitted on a side of the corresponding spring sheet where the static contact or the moving contact is provided, and the thickness of the main baffle is smaller than the cap height of the static contact or the moving contact.

[0008] Furthermore, the arc isolation member further includes two side baffles, which are respectively fixed at opposite ends of the main baffle and respectively fitted on both sides of the corresponding spring sheet in the width direction.

[0009] Furthermore, the main baffle is provided with a protruding column on one side in the thickness direction thereof, and the protruding column is inserted into the insertion hole provided on the corresponding spring.

[0010] Furthermore, the boss is fixedly matched with the socket, and the fixing method includes one or more methods of interference fit, glue bonding, snap connection, and hot riveting.

[0011] Furthermore, the number of the static contacts is multiple, and the multiple static contacts are arranged in parallel; the number of the moving contacts is multiple, and the multiple moving contacts correspond one-to-one to the multiple static contacts; one of the pole surfaces of the arc-extinguishing permanent magnet faces the contact assembly; the number of the arc-extinguishing permanent magnets is two, and the two arc-extinguishing permanent magnets are respectively located on both sides of the contact assembly in the width direction of the reed, and the opposite poles of the two arc-extinguishing permanent magnets are opposite.

[0012] Furthermore, the contact assembly also includes a movable spring lead-out piece, which is elastically deformable, and the upper end of the movable spring piece is fixedly connected to the upper end of the movable spring lead-out piece; the movable spring piece includes a plurality of sub-spring pieces, which are stacked together; the arc-isolating piece is installed on the static spring piece, and the arc-isolating piece is located below the static contact; and it also includes a base, the movable spring lead-out piece and the static spring piece are respectively inserted into the base, and the arc-extinguishing permanent magnet is installed on the base.

[0013] Furthermore, it also includes a pushing card and an armature part, the armature part is connected to the movable spring plate through the pushing card; the armature part is rotatably connected to the base by a rotating shaft; the armature part includes a driving body and an armature assembly arranged on the driving body, the armature assembly is I-shaped, and its four ends respectively extend out of the driving body, the driving body is rotatably connected between the two surrounding walls of the base by a rotating shaft, and the bottom end of the driving body is inserted into the connecting groove set by the pushing card; it also includes a coil part, which is installed on the base, and the coil part includes two yokes opposite to each other in the upper and lower parts, the armature part is fitted between the two yokes, and the free ends of the two yokes are respectively inserted into the recesses on both sides of the armature part.

[0014] Furthermore, the base includes a bottom plate and a surrounding wall protruding upward from the edge of the bottom plate. The arc-extinguishing permanent magnet is installed in a corresponding accommodating groove on the outer side of the surrounding wall and is covered by a magnetic isolation sheet to isolate it from the outside.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention installs an insulating arc-isolating member on at least one reed, and utilizes the arc-isolating member to separate the arc generated by the disconnection of the contact assembly from the reed where the arc-isolating member is located in the arc blowing direction of the arc-extinguishing permanent magnet, so that the potential difference that satisfies the continuous burning of the arc cannot be formed between the terminals with a smaller spacing, thereby facilitating the rapid extinction of the arc and avoiding the phenomenon of continuous burning when the arc root is transferred from the contacts to the terminals with a smaller spacing. Therefore, the present invention can meet the arc extinguishing requirements on the basis of miniaturization and micro-miniaturization of relay products, thereby improving product quality and extending the service life of the product. In addition, the present invention installs the arc-isolating member on the reed, which is more conducive to the miniaturization design of the product and makes the base structure of the product simpler and easier to process and form. In addition, the present invention installs the arc-isolating member on the reed, which is convenient for controlling the tightness of the fit between the arc-isolating member and the reed, and can make the arc-isolating member and the reed fit tightly, thereby further improving the arc-isolating effect and arc-extinguishing performance. In particular, the utility model installs the arc isolation member on the spring leaf, and the arc isolation member made of suitable material can be selected according to the load size, so that the arc isolation effect of the arc isolation member matches the load size, ensuring that the arc isolation member can still effectively isolate the arc when the load is large.

[0017] 2. The arc isolation piece includes not only the main baffle, but also baffles on both sides, so that the arc isolation piece can achieve all-round isolation of the spring where it is located, thereby further ensuring that the arc root will not continue to burn when it transfers from the contacts to the terminals.

[0018] 3. The arc-isolating piece cooperates with the jack provided on the spring through its protruding column, so that the connection between the arc-isolating piece and the spring is simpler and convenient for processing and forming.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the arc isolation member of the present invention;

[0022] Figure 3 This is a top view of the arc isolation member of the present invention;

[0023] Figure 4 This is a front view of the arc isolation member of the present utility model;

[0024] Figure 5 It is a side view of the arc isolation member of the present utility model;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the static spring part of the utility model;

[0026] Figure 7 It is a three-dimensional structural diagram of the static spring part and the arc isolation member of the utility model in the assembled state;

[0027] Figure 8 It is a side view of the static spring part and the arc isolation member of the utility model in the assembled state;

[0028] Figure 9 This is a schematic diagram of the three-dimensional structure of the dynamic spring part of the utility model;

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of the push card of the utility model;

[0030] Figure 11 It is a three-dimensional structural diagram of the movable spring part and the push card in the combined state of the utility model;

[0031] Figure 12 This is a cross-sectional view of the utility model showing the movable spring portion and the push card in an assembled state;

[0032] Figure 13 This is an exploded schematic diagram of the base and two arc-extinguishing permanent magnets of the utility model;

[0033] Figure 14 This is a schematic diagram of the three-dimensional structure of the utility model (excluding the housing);

[0034] Figure 15 It is a cross-sectional view of the utility model;

[0035] In the figure, 1, the dynamic spring part, 11, the dynamic spring lead-out piece, 12, the dynamic spring piece, 121, the sub-spring piece, 122, the U-shaped bend, 123, the hook, 13, the dynamic contact, 2, the push card, 21, the card slot, 22, the clearance slot, 23, the connecting slot, 3, the base, 31, the bottom plate, 311, the guide boss, 312, the dynamic spring slot, 313, the static spring slot, 32, the surrounding wall, 321, the mounting slot, 322, the accommodating slot, 4, the armature part, 41, the driving main Body, 42, armature, 43, permanent magnet, 5, rotating shaft, 6, coil part, 61, coil frame, 62, enameled wire, 63, iron core, 64, yoke, 7, static spring part, 71, static spring sheet, 711, jack, 72, static contact, 8, guide limiter, 9, arc isolation member, 91, main baffle, 911, boss, 92, side baffle, 10, arc extinguishing permanent magnet, 20, magnetic isolation sheet, 30, housing, 40, auxiliary moving spring sheet, 50, auxiliary static spring sheet. DETAILED DESCRIPTION

[0036] In the description of this utility model, the use of terms such as "upper," "lower," "left," "right," "front," and "back" to indicate directions or positional relationships is based on the directions or positional relationships shown in the accompanying drawings and is intended solely to facilitate the description of this utility model. They are not intended to indicate or imply that the device referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limiting the scope of protection of this utility model. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0037] In addition, in the description of the present invention, unless otherwise specified, "at least one" means one or more, and "a plurality" means two or more. In the description of the present invention, unless otherwise specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] See Figures 1-15 As shown, an electromagnetic relay of the utility model includes a contact assembly and an arc-extinguishing permanent magnet 10. The arc-extinguishing permanent magnet 10 is arranged on the outside of the contact assembly, and one of the magnetic poles of the arc-extinguishing permanent magnet 10 faces the contact assembly. The contact assembly includes two springs, one of which is a static spring 71 and is provided with a static contact 72, and the other spring is a dynamic spring 12 and is provided with a dynamic contact 13, and the static contact 72 and the dynamic contact 13 cooperate with each other. An insulating arc-isolating member 9 is installed on at least one spring, and the arc-isolating member 9 is tightly matched with the spring on which it is located, that is, there is no gap between the arc-isolating member 9 and the spring on which it is located. The arc-isolating member 9 separates the arc generated by the disconnection of the contact assembly from the spring on which the arc-isolating member 9 is located in the arc blowing direction of the arc-extinguishing permanent magnet 10.

[0039] In this embodiment, the contact assembly further includes a movable spring lead-out piece 11, a movable spring 12 capable of elastic deformation, and the upper end of the movable spring 12 is fixedly connected to the upper end of the movable spring lead-out piece 11 to form electrical conduction. Specifically, the upper end of the movable spring 12 and the upper end of the movable spring lead-out piece 11 are fixedly connected by riveting. The movable contact 13 is riveted approximately in the middle of the movable spring 12, facing away from the movable spring lead-out piece 11. The movable spring 12 includes a plurality of sub-springs 121, which are stacked together, and each sub-spring 121 has a U-shaped bend 122 at its upper end, protruding toward a side away from the movable spring lead-out piece 11.

[0040] The static spring piece 71 and the static contact 72 are combined to form the static spring part 7, and the dynamic spring piece 12, the dynamic contact 13 and the dynamic spring lead piece 11 are combined to form the dynamic spring part 1 capable of resisting short-circuit current. In this embodiment, since the dynamic spring piece 12 needs to be elastically deformed to provide contact overtravel, the arc isolation member 9 is only installed on the static spring piece 71, and the arc isolation member 9 is located below the static contact 72. In other embodiments, the dynamic spring piece is a rigid spring piece, and the arc isolation member is installed on the dynamic spring piece, or the arc isolation member is installed on the dynamic spring piece and the static spring piece respectively. The arc isolation member 9 can be fixedly connected to the spring piece in which it is located, or it can be detachably connected, and the connection method includes one or more methods such as plug-in, interference fit, gluing, snap connection, hot riveting, etc.

[0041] like Figure 2-Figure 5 As shown, the arc-isolating member 9 includes a main baffle 91, which fits on the side of the corresponding spring (i.e., the static spring 71) where the static contact 72 is located. The thickness of the main baffle 91 is less than the cap height of the static contact 72 to prevent the main baffle 91 from being too thick and hindering effective contact between the static contact 72 and the moving contact 13. The cap height of the static contact 72 refers to the vertical distance between the tail end of the static contact 72 and the surface of the static spring 71 where the static contact 72 is located. In other embodiments, when the arc-isolating member is installed on the moving spring, the main baffle of the arc-isolating member is located on the side of the moving spring where the moving contact is located, and the thickness of the main baffle is less than the cap height of the moving contact.

[0042] As a preferred embodiment, the arc-isolating member 9 also includes side baffles 92, which are fixed to opposite ends of the main baffle 91. Specifically, the side baffles 92 are integrally formed with the main baffle 91. The side baffles 92 fit on either side of the corresponding spring (i.e., the static spring 71) in the width direction, and the spacing between the side baffles 92 matches the width of the corresponding spring where the arc-isolating member 9 is mounted. Therefore, the arc-isolating member 9 of the present invention can achieve all-round isolation of the spring (i.e., the static spring 71) it is located on.

[0043] In this embodiment, the main baffle 91 is provided with a boss 911 on one side in the thickness direction, and the boss 911 is inserted into the socket 711 provided on the corresponding spring sheet (i.e., the static spring sheet 71). The radial dimension of the tail of the boss 911 gradually decreases from the root of the boss 911 to the tail, so that the outer side surface of the tail of the boss 911 is a round table surface that is wide inside and narrow outside, making it easier for the boss 911 to be inserted into the socket 711 of the static spring sheet 71. The socket 711 of the static spring sheet 71 is a through hole structure, but is not limited to this. In other embodiments, the socket 711 is a blind hole. The boss 911 is fixedly matched with the socket 711, and the fixing method includes one or more methods of interference fit, glue bonding, snap connection, and hot riveting. In other embodiments, the barrier member is fixedly engaged with the spring sheet on which it is located through its two side baffles 92, and the fixing methods include interference fit, snap connection, glue bonding, etc., or the main baffle 91 and the two side baffles 92 of the arc isolation member 9 are respectively fixedly engaged with the spring sheet on which they are located, and the fixing methods are as described above.

[0044] In this embodiment, the number of static contacts 72 is multiple, and the multiple static contacts 72 are arranged in parallel. The number of moving contacts 13 is multiple, and the multiple moving contacts 13 correspond one-to-one with the multiple static contacts 72, so that the contact assembly of the present invention constitutes a multi-contact parallel structure, which is beneficial to improving the current carrying capacity of the contact assembly. Specifically, the number of static contacts 72 and the number of moving contacts 13 are two, but not limited to this. The number of arc-extinguishing permanent magnets 10 is two, and the two arc-extinguishing permanent magnets 10 are respectively located on both sides of the contact assembly in the width direction of the spring, and the two arc-extinguishing permanent magnets 10 have opposite poles. In this embodiment, the static contacts 72 and the moving contacts 13 are arranged in the left-right direction, so the two arc-extinguishing permanent magnets 10 are arranged in the front-to-back direction.

[0045] The present invention further comprises a base 3, the above-mentioned dynamic spring lead-out piece 11 and the static spring piece 71 are respectively inserted into the base 3, and the arc-extinguishing permanent magnet 10 is installed on the base 3. Specifically, as Figure 12 As shown, the base 3 includes a bottom plate 31 and two surrounding walls 32 protruding upward from the edge of the bottom plate 31. The two surrounding walls 32 are arranged opposite to each other, and the two arc-extinguishing permanent magnets 10 are respectively installed in the corresponding accommodating grooves 322 arranged on the outer surfaces of the two surrounding walls 32, and are covered by the magnetic isolation plate 20 to isolate the magnetism from the outside. Specifically, the magnetic isolation plate 20 is roughly U-shaped, and the arc-extinguishing permanent magnets 10 are embedded in the magnetic isolation plate 20, and the two are installed together in the accommodating grooves 322 of the surrounding walls 32. The lower end of the above-mentioned dynamic spring lead-out piece 11 is inserted into the dynamic spring slot 312 corresponding to the bottom plate 31 of the base, and the lower end of the static spring piece 71 is inserted into the static spring slot 313 corresponding to the bottom plate 31 of the base. The upper end of the static spring piece 71 is provided with a static contact 72.

[0046] The utility model also includes a push card 2 and an armature part 4, and the armature part 4 is connected to the dynamic spring 12 through the push card 4. Figure 10As shown, the push card 2 is provided with, from left to right, a latching slot 21, a clearance slot 22, and a connecting slot 23 for engaging with the armature portion. The clearance slot 22 is located between the latching slot 21 and the connecting slot 23. The latching slot 21, the clearance slot 22, and the connecting slot 23 are each a through-slot structure that is vertically continuous and enclosed on all sides. The lower end of the movable spring 12 is engaged with the latching slot 21, so that the movable spring 12 limits the push card 2. Specifically, the lower end of the movable spring 12's multiple sub-springs, the one furthest from the movable spring lead-out piece, is at least partially bent upward from the side away from the movable spring lead-out piece 11 to form a hook 123. This hook 123 engages with the latching slot 21 of the push card 2. The lower end of the movable spring lead-out piece 11 passes through the clearance slot 22 from top to bottom. The movable spring portion 1 and the push card 2 are assembled to form a movable spring assembly. This movable spring assembly is installed from top to bottom into the base 3 and is located between the two surrounding walls 32 of the base 3. Guide limiters 8 are installed at the bottom of the two surrounding walls 32 of the base 3. These guide limiters 8 limit the position of the push card 2 and guide its movement.

[0047] As a preferred embodiment, the bottoms of the two surrounding walls 32 of the base 3 are respectively provided with mounting grooves 321 that penetrate the inner and outer wall surfaces thereof. The guide limiter 8 is inserted into the mounting grooves 321 from the outer side of the surrounding wall 32, and the guide limiter 8 partially passes through the mounting grooves 321 and protrudes from the inner side surface of the surrounding wall 32 to provide an upper limit and movement guide for the push card 2. In addition, the upper surface of the bottom plate 31 is provided with a guide boss 311, which provides support and movement guidance for the push card 2. Specifically, the upper surface of the bottom plate 31 is respectively provided with a guide boss 311 at the position where the two surrounding walls 32 meet. The guide boss 311 is in the shape of an elongated strip and extends along the movement direction of the push card 2. The guide limiter 8 and the guide boss 311 on the same side cooperate with each other to form a guide slot for the push card 2.

[0048] The armature portion 4 is rotatably connected between the two surrounding walls 32 of the base 3 via a rotating shaft 5, and the bottom of the armature portion 4 is inserted into the corresponding connection slot 23 of the push clamp 2. The armature portion 4 specifically includes an insulated driving body 41 and an armature assembly disposed within the driving body 41. The armature assembly is I-shaped, with its four ends extending outside the driving body 41. The driving body 41 is rotatably connected to the surrounding frame 31 of the base 3 via a rotating shaft 5, and the bottom end of the driving body 41 is connected to the push clamp 2. The armature assembly specifically comprises two parallel armatures 42 and a permanent magnet 43 clamped between the two armatures 41. The present invention also includes a coil portion 6, which includes a coil frame 61, an enameled wire 62 wound around the coil frame 61, two yokes 64, and an iron core 63. The iron core 63 is inserted into a through hole of the coil frame. The two yokes 64 are L-shaped, with one side of each yoke 64 riveted to the opposite ends of the iron core 63. The free ends of the two yokes 64 are respectively inserted into the recesses on both sides of the armature part 4, that is, the other side of one yoke 64 is fitted between the upper ends of the two armature pieces 42, and the other side of the other yoke 64 is fitted between the lower ends of the two armature pieces 42. Figure 15 Therefore, the present invention constitutes a magnetic latching relay, but is not limited thereto.

[0049] The present invention further comprises a housing 30, the bottom end of which is connected to the base 3 and houses the static spring 7, the dynamic spring 1, the pusher 2, the armature 4, the coil 6, and the like. The present invention further comprises an auxiliary dynamic spring 40 and an auxiliary static spring 50, which are mounted on the base 1. The auxiliary dynamic spring 40 is provided with an auxiliary dynamic contact, while the auxiliary static spring 50 is provided with an auxiliary static contact. The auxiliary dynamic and static contacts cooperate with each other. The auxiliary dynamic spring 40 is driven by the armature 4. The closed state of the auxiliary dynamic spring 30 and the auxiliary static spring 40 is similar to the closed state of the dynamic spring 1 and the static spring 7.

[0050] In the electromagnetic relay of the present invention, when the movable contact 13 and the stationary contact 72 are disconnected and an arc is generated, the arc moves downward under the magnetic field of the arc-extinguishing permanent magnet 10, causing the arc root to move downward from between the contacts to between the terminals (i.e., between the stationary reed 71 and the movable reed 12). Because the arc is separated from the stationary reed 71 by the arc-isolating member 9, even if the distance between the stationary reed 71 and the movable reed 12 is very small, the potential difference required for the arc to continue burning cannot be formed. Therefore, the arc is quickly extinguished between the stationary reed 71 and the movable reed 12, thereby avoiding serious problems such as contact burnout and product failure caused by the continued burning of the arc.

[0051] Therefore, the present invention can meet the arc extinguishing requirements on the basis of miniaturization and micro-miniaturization of relay products, thereby improving product quality and extending product service life. Moreover, the present invention installs the arc-isolating member 9 on the reed (i.e., the static reed or the dynamic reed), which is more conducive to the miniaturized design of the product, and makes the base structure of the product simpler and easier to process and form. In addition, the present invention installs the arc-isolating member 9 on the reed, so that the arc-isolating member 9 and the reed can fit closely together, thereby greatly improving the arc-isolating effect and arc-extinguishing performance. In particular, the present invention installs the arc-isolating member 9 on the reed, and the arc-isolating member 9 made of a suitable material can be selected according to the load size, so that the arc-isolating effect of the arc-isolating member 9 matches the load size, ensuring that the arc-isolating member 9 can still effectively isolate the arc when the load current is large. Specifically, the material of the arc-isolating member 9 can be plastic or ceramic, etc. The larger the load, the more high-temperature-resistant material (such as ceramic, etc.) can be selected to make the arc-isolating member 9.

[0052] The electromagnetic relay of the present invention is the same as that of the prior art, and the parts not involved are the same as those of the prior art or can be implemented by using the prior art.

[0053] The above embodiments are only used to further illustrate an 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 comprising a contact assembly and an arc-extinguishing permanent magnet, the arc-extinguishing permanent magnet being disposed outside the contact assembly; the contact assembly comprising two springs, one of which is a stationary spring and is provided with a stationary contact, and the other is a movable spring and is provided with a movable contact, the stationary contact and the movable contact cooperating with each other; characterized in that: An insulating arc-isolating member is installed on at least one reed, and the arc-isolating member isolates the arc generated by the disconnection of the contact assembly from the reed where the arc-isolating member is located in the arc blowing direction of the arc-extinguishing permanent magnet.

2. The electromagnetic relay according to claim 1, wherein: The arc-isolating member is tightly fitted with the spring sheet where it is located; the arc-isolating member is fixedly connected to the spring sheet where it is located or is detachably connected, and the connection method includes one or more of plug-in, interference fit, glue bonding, snap connection, and hot riveting.

3. The electromagnetic relay according to claim 1, wherein: The arc isolation member includes a main baffle, which is matched with the side of the corresponding spring leaf provided with a static contact or a moving contact, and the thickness of the main baffle is smaller than the cap height of the static contact or the moving contact.

4. The electromagnetic relay according to claim 3, wherein: The arc isolation member further includes two side baffles, which are respectively fixed at two opposite ends of the main baffle and respectively matched with two sides of the corresponding spring sheet in the width direction.

5. The electromagnetic relay according to claim 3, wherein: The main baffle is provided with a convex column on one side in the thickness direction thereof, and the convex column is inserted into the insertion hole provided on the corresponding spring sheet.

6. The electromagnetic relay according to claim 5, characterized in that: The boss is fixedly matched with the socket, and the fixing method includes one or more of interference fit, glue bonding, snap connection, and hot riveting.

7. The electromagnetic relay according to claim 1, wherein: The number of the static contacts is multiple, and the multiple static contacts are arranged in parallel. The number of the moving contacts is multiple, and the multiple moving contacts correspond one-to-one to the multiple static contacts. One of the pole surfaces of the arc-extinguishing permanent magnet faces the contact assembly. The number of the arc-extinguishing permanent magnets is two, and the two arc-extinguishing permanent magnets are respectively located on both sides of the contact assembly in the width direction of the reed, and the opposite poles of the two arc-extinguishing permanent magnets are opposite.

8. The electromagnetic relay according to any one of claims 1 to 7, characterized in that: The contact assembly also includes a movable spring lead-out piece, which is elastically deformable and has its upper end fixedly connected to the upper end of the movable spring lead-out piece; the movable spring includes a plurality of sub-springs stacked together; the arc-isolating piece is mounted on the static spring, and the arc-isolating piece is located below the static contact; and the contact assembly also includes a base, the movable spring lead-out piece and the static spring piece are respectively inserted into the base, and the arc-extinguishing permanent magnet is mounted on the base.

9. The electromagnetic relay according to claim 8, characterized in that: It also includes a push card and an armature part, the armature part is connected to the movable spring through the push card; the armature part is rotatably connected to the base by a rotating shaft; the armature part includes a driving body and an armature assembly arranged on the driving body, the armature assembly is I-shaped, and its four ends extend out of the driving body respectively, the driving body is rotatably connected between the two surrounding walls of the base by a rotating shaft, and the bottom end of the driving body is inserted into the connecting groove set by the push card; it also includes a coil part, which is installed on the base, and the coil part includes two yokes opposite to each other in an upper and lower direction, the armature part is fitted between the two yokes, and the free ends of the two yokes are respectively inserted into the recesses on both sides of the armature part.

10. The electromagnetic relay according to claim 8, wherein: The base includes a bottom plate and a surrounding wall protruding upward from the edge of the bottom plate. The arc-extinguishing permanent magnet is installed in a corresponding accommodating groove on the outer side of the surrounding wall and is covered by a magnetic isolation sheet to isolate it from external magnetism.

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