Patent Description:
Electromagnetic relay is a kind of relay that uses electromagnetic force to drive relative movement of mechanical parts to produce a predetermined response, and it generally includes a magnetic circuit part, a movable spring part, a stationary spring part, a base and a case. The magnetic circuit part includes an iron core, a bobbin wound with enameled wires, an armature, a yoke, and the like. When the coil (i.e. enameled wire) is energized, an electromagnetic force will be generated, and the armature will be attracted and contact with the pole face at one end of the iron core, thereby driving the movable contact of the movable spring part to contact with or separate from the stationary contact of the stationary spring part; when the current in the coil disappears, the electromagnetic force disappears, and the armature is reset and separated from the pole face at one end of the iron core, so that the movable contact of the movable spring part is separated from or contacted with the stationary contact of the stationary spring part. Through the contact or separation of the movable contact and the stationary contact, the purpose of switching on or switching off the circuit is achieved.

Some electromagnetic relays in the related art are provided with a plurality of sets of contacts, which can be applied to multi-phase circuits, such as three-phase alternating current. The plurality of sets of contacts of this electromagnetic relay are usually located in separate compartments, the compartment is provided with a lateral opening and is covered by a case. However, due to a gap is existed between the partition plate located between adjacent compartments and the case, when the electromagnetic relay is used to switch multi-phase high currents (such as three-phase 500A short-circuit current), the arc generated by the breaking of contacts in a compartment easily enters the adjacent compartment, resulting in arc short circuit or even explosion.

Document <CIT> discloses a forcibly guided relay with a housing.

In view of the technical problems existing in the related art, the present disclosure provides an electromagnetic relay for preventing arc short circuit, which, by improving the structure, prevents arc short circuit caused by the arc generated by the breaking of the contacts.

The technical solution adopted by the present disclosure to solve the technical problem is: an electromagnetic relay for preventing arc short circuit incudes a base, a magnetic circuit part, a contact part, an actuator and a first arc partition plate. The base is provided with a first accommodating cavity, the first accommodating cavity is provided with a plurality of partition plates to divide the first accommodating cavity into a plurality of compartments distributed along a preset direction, a side of the first accommodating cavity is provided with a first opening leading to each of the compartments. The magnetic circuit part installed on the base and comprising an armature. The contact part includes a plurality of contact units corresponding to the plurality of compartments one-to-one, each of the plurality of contact units includes a movable spring part and a stationary spring part, and the movable spring part and the stationary spring part are installed in a corresponding compartment and configured to cooperate with each other. The armature of the of the magnetic circuit part are cooperated with the movable spring part of each of the contact units by the actuator. The first arc partition plate is configured to close all or part of the first opening, and an inner side of the first arc partition 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 configured to adjacent to or abut against a partition plate of the compartment to form at least two partition walls located between adjacent compartments. The electromagnetic relay further includes a case with an opening at a bottom, wherein the case is connected with the base, and is configured to accommodate the magnetic circuit part, the contact part, the actuator and the first arc partition plate in a casing cavity of the case.

According to embodiments of the present disclosure, a side of the first accommodating cavity is further provided with a second opening leading to each compartment, and the second opening and the first opening are located at two opposite sides of the first accommodating cavity, and the first openings and the second openings are distributed in a direction perpendicular to the preset direction; the movable spring part is laterally installed in a corresponding compartment from the first opening, and the stationary spring part is laterally installed in the corresponding compartment from the second opening; the electromagnetic relay further includes a second arc partition plate, the second arc partition plate is configured to close all or part of the second opening, and an inner side of the second arc partition plate is provided with a plurality of second baffles distributed along the preset direction, at least one second baffle is laterally inserted into each compartment, and the second baffle is configured to adjacent to or abut against the baffle plate of the compartment to form at least two arc partition walls located between adjacent compartments.

According to embodiments of the present disclosure, the first baffles of the first arc partition plate are respectively laterally inserted into a first slot provided in a corresponding compartment, among the plurality of second baffles of the second arc partition plate, every two second baffles is in a group, and a second slot is formed between the two second baffles of a same group, the second slot is inserted and matched with the partition plate in a corresponding compartment.

According to embodiments of the present disclosure, the actuator is disposed along the preset direction and fitted at the first opening, the first arc partition plate is located below the actuator; the first opening is provided with a first arc blocking structure at a position above the actuator to limit an arc generated by a breaking of the movable spring part and the stationary spring part from entering an adjacent compartment from a space above the actuator.

According to embodiments of the present disclosure, the first arc blocking structure includes a plurality of third baffles, and the plurality of third baffles are disposed on an inner side of the case facing the first opening and are arranged at intervals along the preset direction, a top of each of the third baffles is connected to an inner top surface of the case, and at least one third baffle is inserted downward into one compartment from a top of the compartment, and the third baffle is configured to adjacent to or abut against a part of the partition plate of the compartment above the actuator to form at least two arc partition walls located between top portions of adjacent compartments.

According to embodiments of the present disclosure, the portions of the plurality of partition plates close to the first opening are respectively provided with a first notch for avoiding the actuator; at least one side of each partition plate is provided with a second arc blocking structure, so as to restrict the arc generated by the breaking of the movable spring part and the stationary spring part from entering the adjacent compartment from a gap between the first notch and the actuator.

According to embodiments of the present disclosure, the second arc blocking structure includes an upper baffle and a lower baffle arranged on a same side of the compartment, the upper baffle is fitted above the actuator, and the lower baffle is fitted below the actuator, one end of the upper baffle and one end of the lower baffle away from the partition plate are respectively inclined toward a direction close to the actuator; the second arc blocking structure further includes a side baffle, the side baffle is located inside the actuator, and an upper end of the side baffle is connected to the upper baffle, and a lower end of the side baffle is connected to the lower baffle.

According to embodiments of the present disclosure, a plurality of arc blocking portions are provided on a top of the inner side of the first arc partition plate, and bottom ends of the arc blocking portions are respectively connected with the top ends of the plurality of first baffles of the first arc partition plate one by one, top ends of the plurality of arc blocking portions are configured to extend toward a direction close to the actuator; a longitudinal section of the arc blocking portion in the preset direction is an inverted T-shape.

According to embodiments of the present disclosure, the inner side of the second arc partition plate is provided with a plurality of fourth baffles distributed along the preset direction at intervals, at least one fourth baffle is laterally inserted into one compartment.

According to embodiments of the present disclosure, the base is further provided with a second accommodating cavity of which upper end is open; the magnetic circuit part includes a coil assembly and the armature, the coil assembly is horizontally disposed in the second accommodating cavity, the armature is located outside the second accommodating cavity and is disposed 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.

According to embodiments of the present disclosure, the movable spring part includes a movable spring lead-out pin, a rigid spring, a flexible connector and a reaction force spring, the movable spring lead-out pin is laterally inserted into the base, a top of the rigid spring is rotatably connected with a top of the movable spring lead-out pin, the flexible connector is connected between the top of the rigid spring and the top of the movable spring lead-out pin; a movable contact is provided on a side of a bottom of the rigid spring facing away from the movable spring lead-out pin; the reaction force spring is located between the movable spring lead-out pin and the rigid spring, and a bottom of the reaction force spring is fixedly connected with the rigid spring, there is a preset distance between a top of the reaction force spring and the rigid spring; the actuator is provided with a plurality of slots distributed along the preset direction and corresponding to the movable spring part one-to-one, the rigid spring and the reaction force spring of the movable spring part are respectively snapped into corresponding slots.

According to embodiments of the present disclosure, the electromagnetic relay further includes an auxiliary movable spring provided with an auxiliary movable contact and an auxiliary stationary spring provided with an auxiliary stationary contact, the auxiliary movable spring and the auxiliary stationary spring are respectively configured to insert into the base and are located at a side of the base where the armature is located; one end of the actuator facing the armature is provided with a driving portion, and the driving portion is configured to cooperate with the auxiliary movable spring to drive the auxiliary movable spring to move.

Compared with the related art, the electromagnetic relay of the embodiments of the present disclosure has the following beneficial effects:.

The present disclosure 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 disclosure is not limited to the embodiments.

Please refer to <FIG>, an electromagnetic relay for preventing arc short circuit of the present disclosure includes a case <NUM> with an opening at the bottom, a base <NUM>, a magnetic circuit part <NUM>, a contact part and an actuator <NUM>, and the magnetic circuit part <NUM> is horizontally installed on the base <NUM>; the base <NUM> is provided with a first accommodating cavity <NUM> for accommodating the contact part, the first accommodating cavity <NUM> is provided with a plurality of partition plates <NUM> to divide the first accommodating cavity <NUM> into a plurality of compartments <NUM> distributed along a preset direction D1, a side of the first accommodating cavity <NUM> is provided with a first opening <NUM> leading to each compartment <NUM>; the contact part includes a plurality of contact units corresponding to the plurality of compartments <NUM> one-to-one, each contact unit includes a movable spring part <NUM> and a stationary spring part <NUM>, and the movable spring part <NUM> and the stationary spring part <NUM> are installed in a corresponding compartment <NUM> and configured to cooperate with each other; the armature <NUM> of the magnetic circuit part <NUM> cooperates with the movable spring part <NUM> of each contact unit by the actuator <NUM>. The electromagnetic relay of the present disclosure further includes a first arc partition plate <NUM>, the first arc partition plate <NUM> closes all or part of the first opening <NUM>, and the inner side of the first arc partition plate <NUM> is provided with a plurality of first baffles <NUM> distributed along the preset direction D1, and each of the first baffles <NUM> is vertical. At least one first baffle <NUM> is laterally inserted into each compartment <NUM>, and the first baffle <NUM> is adjacent to or abuts against the partition plate <NUM> of the compartment <NUM> to form at least two partition walls located between adjacent compartments; the bottom end of the case <NUM> is connected to the base <NUM> and accommodates the magnetic circuit part <NUM>, the contact part, the actuator <NUM> and the first arc partition plate <NUM> in its casing cavity. The preset direction D1 is specifically the length direction of the base <NUM>, but is not limited thereto. In other embodiments, the preset direction D1 is the width direction of the base <NUM>. The magnetic circuit part <NUM> is lying on the base <NUM> along the preset direction D1. The inner side of the first arc partition plate <NUM> refers to a side surface of the first arc partition plate <NUM> facing the inside of the first accommodating cavity <NUM>.

In the embodiment, a side of the first accommodating cavity <NUM> is further provided with a second opening <NUM> leading to each compartment <NUM>, and the second opening <NUM> and the first opening <NUM> are located at two opposite sides of the first accommodating cavity <NUM>, and the first openings <NUM> and the second openings <NUM> are distributed in a direction perpendicular to the preset direction D1. The movable spring part <NUM> is laterally installed in the corresponding compartment <NUM> from the first opening <NUM>, and the stationary spring part <NUM> is laterally installed in the corresponding compartment <NUM> from the second opening <NUM>. In this way, it is ensured that the lead-out pin of the movable spring part <NUM> located under the base <NUM> and the lead-out pin of the stationary spring part <NUM> located under the base <NUM> are far away from each other, so as to ensure that the clearance between the both meets the requirements for use. The electromagnetic relay of the present disclosure further includes a second arc partition plate <NUM>, the second arc partition plate <NUM> closes the second opening <NUM>, and the inner side of the second arc partition plate <NUM> is provided with a plurality of second baffles <NUM> distributed along the preset direction D1, at least one second baffle <NUM> is laterally inserted into each compartment <NUM>, and the second baffle <NUM> is adjacent to or abuts against the partition plate <NUM> of the compartment <NUM> to form at least two arc partition walls located between adjacent compartments <NUM>. The second arc partition plate <NUM> is located in the case <NUM>, and the inner side of the second arc partition plate <NUM> refers to a side surface of the second arc partition plate <NUM> facing the inside of the first accommodating cavity <NUM>. In other embodiments, the electromagnetic relay of the present disclosure is not provided with the second opening <NUM>, and the movable spring part <NUM> and the stationary spring part <NUM> are both installed in the corresponding compartment <NUM> from the first opening <NUM>.

In the embodiment, as shown in <FIG>, the first baffles <NUM> of the first arc partition plate <NUM> are respectively laterally inserted into the first slot <NUM> provided in the corresponding compartment <NUM>, as shown in <FIG>, among the plurality of second baffles <NUM> of the second arc partition plate <NUM>, every two second baffles <NUM> is in a group, and a second slot <NUM> is formed between the two second baffles <NUM> of the same group, the second slots <NUM> are inserted and matched with the partition plates <NUM> in the corresponding compartments. In this way, the first arc partition plate <NUM> and the second arc partition plate <NUM> can be pre-positioned when they are inserted laterally. The periphery or part of the periphery of the first arc partition plate <NUM> and the second arc partition plate <NUM> can be further fixed with the base <NUM> by dispensing glue. In addition, a first sealing rib <NUM> may be provided on all or part of the periphery of the inner side of the first arc partition plate <NUM>, and a second sealing rib <NUM> may be provided on all or part of the periphery of the inner side of the second arc partition plate <NUM>, so that the stability of the first arc partition plate <NUM> and the second arc partition plate <NUM> can be ensured, and the leakage of the arc can be further avoided.

In the embodiment, as shown in <FIG> and <FIG>, the actuator <NUM> is in an arrangement that the actuator <NUM> is disposed along the preset direction D1 and fitted at the first opening <NUM>, not only can the arrangement of the actuator <NUM> make the installation of the actuator <NUM> easier, but also enables the force point between the actuator <NUM> and the movable spring part <NUM> and the force point between the actuator <NUM> and the armature <NUM> to be located on or substantially on the same straight line, the actuator <NUM> is not easily deformed during the working process, so as to ensure that the service life of the entire electromagnetic relay will not be reduced due to the quality problem of the actuator <NUM>. Specifically, as shown in <FIG>, the actuator <NUM> is approximately located in the middle of the first opening <NUM> in the up-down direction, and the first arc partition plate <NUM> is located below the actuator <NUM>. Therefore, the first arc partition plate <NUM> closes the lower portion of the first opening <NUM>, as shown in <FIG>, and the second arc partition plate <NUM> closes the entire second opening <NUM>. The first opening <NUM> is provided with a first arc blocking structure at the position above the actuator <NUM> to limit the arc generated by the breaking of the movable spring part <NUM> and the stationary spring part <NUM> from entering the adjacent compartment <NUM> from the space above the actuator <NUM>. In other embodiments, the actuator is fitted at the inner side of each movable spring part <NUM>, or the actuator <NUM> is located inside the first arc partition plate <NUM>, in this case, the first arc partition plate <NUM> can be further enlarged to close the first opening <NUM>, so that the first arc blocking structure can be eliminated.

In the embodiment, as shown in <FIG>, the first arc blocking structure includes a plurality of third baffles <NUM>, and the plurality of third baffles <NUM> are disposed on the inner side of the case <NUM> facing the first opening <NUM>, and are arranged at intervals along the preset direction D1, the top of each third baffle <NUM> is respectively connected to the inner top surface of the case <NUM>, and at least one third baffle <NUM> is inserted downward into each compartment <NUM> from the top of the compartment <NUM>, and the third baffle <NUM> is adjacent to or abuts against the part of the partition plate <NUM> of the compartment <NUM> above the actuator <NUM> to form at least two arc partition walls located between the top portions of adjacent compartments <NUM>. As shown in <FIG>, the plurality of third baffles <NUM> are respectively inserted downward into the third slots <NUM> provided in the upper portions of the corresponding compartments <NUM>. Therefore, the top wall of each compartment <NUM> is respectively provided with a second notch <NUM> to avoid the third baffle <NUM> when it is inserted downward. In other embodiments, the first arc blocking structure and the case <NUM> are separate components, and the first arc blocking structure includes a third arc partition plate, a plurality of third baffles are provided on the inner side of the third arc partition plate <NUM>, and the third arc partition plate closes the portion of the first opening <NUM> above the actuator <NUM>.

In the embodiment, as shown in <FIG>, the portions of the plurality of partition plates <NUM> close to the first opening <NUM> are respectively provided with a first notch <NUM> for avoiding the actuator <NUM>. At least one side of each partition plate <NUM> is provided with a second arc blocking structure, so as to restrict the arc generated by the breaking of the movable spring part <NUM> and the stationary spring part <NUM> from entering the adjacent compartment <NUM> from the gap between the first notch <NUM> and the actuator <NUM>.

In the embodiment, as shown in <FIG>, the second arc blocking structure includes an upper baffle <NUM> and a lower baffle <NUM> arranged on the same side of the compartment <NUM>, the upper baffle <NUM> is approximately Z-shaped and fits above the actuator <NUM>, and the lower baffle <NUM> is inclined and fits below the actuator <NUM>, as shown in <FIG> and <FIG>, the upper baffle <NUM> and the lower baffle <NUM> are configured to extend obliquely from the partition plate <NUM> in the direction close to the actuator <NUM>. One end of the upper baffle <NUM> and one end of the lower baffle <NUM> away from the first opening <NUM> are respectively connected to the inner side of the compartment <NUM>. The second arc blocking structure further includes a side baffle <NUM>, the side baffle <NUM> is located inside the actuator <NUM>, and the upper end of the side baffle <NUM> is connected to the upper baffle <NUM>, and the lower end of the side baffle <NUM> is connected to the lower baffle <NUM>; one end of the side baffle <NUM> facing away from the actuator <NUM> is respectively connected to the inner side of the compartment <NUM>. The cross section of the actuator <NUM> is in a shape of a horizontal T. As shown in <FIG>, the upper baffle <NUM> and the lower baffle <NUM> are respectively located at the upper and lower sides of the position corresponding to the horizontal portion of the horizontal T shape of the actuator <NUM>.

In the embodiment, as shown in <FIG>, a plurality of arc blocking portions <NUM> are provided on the top of the inner side of the first arc partition plate <NUM>, and the bottom ends of the arc blocking portions <NUM> are respectively connected with the top ends of the plurality of first baffles <NUM> of the first arc partition plate <NUM> one by one, the top ends of the plurality of arc blocking portions <NUM> extend toward the direction close to the actuator <NUM>, and are located below the lower baffle <NUM>; the longitudinal section of the arc blocking portion <NUM> in the preset direction D1 is an inverted T-shape.

In the embodiment, as shown in <FIG>, the base <NUM> is further provided with a second accommodating cavity <NUM> of which upper end is open, as shown in <FIG>, the magnetic circuit part <NUM> includes a coil assembly and the armature <NUM>, the coil assembly is horizontally disposed in the second accommodating cavity <NUM>, the armature <NUM> is located outside the second accommodating cavity <NUM>, and is disposed at one end of the base <NUM> in the preset direction D1; the first accommodating cavity <NUM> and the second accommodating cavity <NUM> are separated in a direction perpendicular to the preset direction D1 (i.e., the width direction of the base <NUM> ), and the second opening <NUM> is located below the second accommodating cavity <NUM>.

In the embodiment, as shown in <FIG> and <FIG>, the coil assembly of the magnetic circuit part <NUM> includes a bobbin31, an iron core <NUM>, an enameled wire <NUM>, and a yoke <NUM>, and the iron core <NUM> is inserted into the bobbin <NUM>, and two ends of the iron core <NUM> are exposed, the enameled wire <NUM> is wound outside the bobbin <NUM>, and the yoke <NUM> is L-shaped and includes a first yoke portion <NUM> and a second yoke portion <NUM>. The first yoke portion <NUM> is fixedly connected to the end of the iron core <NUM> away from the armature <NUM> (or the first yoke portion <NUM> and the iron core <NUM> can also be integrally formed), and the second yoke portion <NUM> is fitted at a side of the bobbin <NUM> after the enameled wire <NUM> is wound. The armature <NUM> is specifically limited at the knife edge of the second yoke portion <NUM> of the yoke <NUM> by the return spring <NUM>, the knife edge is a notch at the end of the second yoke portion <NUM> away from the first yoke portion <NUM> (not shown in the figure), and the notch is used to insert the armature <NUM>. The knife edge of the yoke <NUM> is a well-known technical term in the art, and will not be repeated here.

The cross-section of the armature <NUM> is generally in a shape of a line segment, and the part of the armature <NUM> that configured to cooperate with the pole surface <NUM> of the iron core <NUM> is bent in an inclined shape toward the side away from the iron core <NUM>. In this way, the rotation angle of the armature <NUM> is made larger, so that the stroke of actuator <NUM> is larger. Therefore, the contact clearance between the movable spring part <NUM> and the stationary spring part <NUM> in the cut-off state is larger, so that the safety performance of the electromagnetic relay of the present disclosure in the cut-off state can be improved. In the embodiment, as shown in <FIG> and <FIG>, the movable spring part <NUM> is configured as a structure resistant to short-circuit current, which includes a movable spring lead-out pin <NUM>, a rigid spring <NUM>, a flexible connector <NUM> and a reaction force spring <NUM>, the movable spring lead-out pin <NUM> is laterally inserted into the base <NUM> from the first opening <NUM>, and its bottom is located below the base <NUM>, and forms the lead-out pin of the movable spring part <NUM>, the top of the rigid spring <NUM> is rotatably connected with the top of the movable spring lead-out pin <NUM>, so that the rigid spring <NUM> can rotate in a direction away from or close to the movable spring lead-out pin <NUM>, the flexible connector <NUM> is connected between the top of the rigid spring <NUM> and the top of the movable spring lead-out pin <NUM>; a movable contact <NUM> is provided on the side of the bottom of the rigid spring <NUM> facing away from the movable spring lead-out pin <NUM>; the reaction force spring <NUM> is located between the movable spring lead-out pin <NUM> and the rigid spring <NUM>, and the bottom of the reaction force spring <NUM> is fixedly connected with the rigid spring <NUM>, there is a preset distance between the top of the reaction force spring <NUM> and the rigid spring <NUM>; the actuator <NUM> is provided with a plurality of slots distributed along the preset direction D1 and corresponding to the movable spring parts <NUM> one-to-one. The rigid springs <NUM> and the reaction force springs <NUM> of the movable spring parts <NUM> are respectively snapped into the corresponding slots. In this way, the actuator <NUM> drives the rigid spring <NUM> to move toward the direction close to the stationary spring part <NUM> by pushing the reaction force spring <NUM>, thereby generating an overstroke. The stationary spring part <NUM> includes a stationary spring <NUM> and a stationary contact <NUM> disposed on one end of the stationary spring <NUM>, and the other end of the stationary spring <NUM> is integrally formed with a lead-out pin.

In the embodiment, as shown in <FIG>, the present disclosure includes a plurality of limiting members <NUM>, through which the actuator <NUM> is restricted from sliding out of the first opening <NUM> to the outside. Each limiting member <NUM> is approximately in a shape of a "<IMG>", that is, the limiting member <NUM> may include a first portion, a second portion and a third portion connected in sequence, the first portion and the third portion are substantially parallel, and the two ends of the second portion are respectively connected to the ends of the first portion and the third portion at the same side, the other ends of the first portion and the third portion are free ends so that the limiting member <NUM> forms a lateral opening. The middle side (i.e., the second portion) of the limiting member <NUM> is located at the outside of the actuator <NUM>, and the remaining two sides (i.e., the first portion and the third portion) are fitted at the upper and lower sides of the actuator <NUM> respectively, and are inserted into the sockets provided on the corresponding partition plate <NUM>. The top of the first arc partition plate <NUM> is provided with third notches <NUM> for avoiding the portions of the limiting member <NUM>. As shown in <FIG>, a plurality of first grooves <NUM> spaced along the preset direction D1 are provided at the bottom of the first arc partition plate <NUM>, the plurality of first grooves <NUM> are inserted and matched with the plurality of first protrusions <NUM> located on the bottom of the base <NUM> and protruding outward from the first opening <NUM> (as shown in <FIG>), so that the first arc partition plate <NUM> can be pre-positioned. Similarly, as shown in <FIG>, the bottom of the second arc partition plate <NUM> is also provided with a plurality of second grooves <NUM> spaced along the preset direction D1, the plurality of second grooves <NUM> are inserted and matched with the plurality of second protrusions <NUM> located on the bottom of the base <NUM> and protruding outward from the second opening <NUM> (as shown in <FIG>), so that the second arc partition plate <NUM> can be pre-positioned.

In the embodiment, as shown in <FIG> and <FIG>, the electromagnetic relay of the embodiment of the present disclosure further includes an auxiliary movable spring <NUM> provided with an auxiliary movable contact and an auxiliary stationary spring <NUM> provided with an auxiliary stationary contact, the two are respectively configured to insert into the base <NUM> and are located at the side where the armature <NUM> is located; one end of the actuator <NUM> facing the armature <NUM> is provided with a driving portion <NUM>, and the driving portion <NUM> is configured to cooperate with the auxiliary movable spring <NUM> to drive the auxiliary movable spring <NUM> to move; the moving state of the auxiliary movable spring <NUM> is opposite to the moving state of the movable spring part <NUM>. That is, when the movable spring part <NUM> moves in the direction of attracting to the stationary spring part <NUM>, the auxiliary movable spring <NUM> moves in the direction of separating from the stationary spring part <NUM>, which is opposite to the direction when the movable spring part <NUM> is attracted to the stationary spring part <NUM>, when the movable spring part <NUM> moves in the direction of separating from the stationary spring part <NUM>, the auxiliary movable spring <NUM> moves in the direction of attracting to the stationary spring part <NUM>, which is opposite to the direction when the movable spring part <NUM> is separated from the stationary spring part <NUM>.

In the electromagnetic relay for preventing arc short circuit of the present disclosure, the number of contact units is specifically four, but not limited thereto. Therefore, the electromagnetic relay of the present disclosure can be applied to a three-phase four-wire circuit, where each group of contact units can reach a current carrying capacity of 40A and can withstand a short-circuit current of 3kA.

The operating principle of the electromagnetic relay of the present disclosure is: when the coil (i.e., the enameled wire <NUM>) is energized, the armature <NUM> rotates around the knife edge of the yoke <NUM>, attracts and engages with the pole surface <NUM> of the iron core <NUM>, and at the same time drives the actuator <NUM> to move along the length direction of the base <NUM>, and drives the reaction force spring <NUM> and the rigid spring <NUM> of the movable spring part <NUM> to move to realize the movable contact <NUM> and the stationary contact <NUM> are in a close state. When the movable contact <NUM> and the stationary contact <NUM> just come into contact, the reaction force spring <NUM> begins to be deformed, after the armature <NUM> is in full contact with the pole surface <NUM> of the iron core <NUM>, the deformation of the reaction force spring <NUM> ends, and the overstroke is mainly realized by the elastic deformation of the reaction force spring <NUM>. The rigid spring <NUM> is only responsible for conducting electricity, and is not responsible for deforming to achieve the over-travel function. When the coil (i.e., the enameled wire <NUM>) is de-energized, the armature <NUM> is reset under the action of the return spring <NUM>, and at the same time drives the actuator <NUM> to move in the opposite direction, and drives the reaction force spring <NUM> and the rigid spring <NUM> of each movable spring part <NUM> to move in the opposite direction, so that the movable contact <NUM> and the stationary contact <NUM> are in a cut-off state. When the movable contact <NUM> of one group of the movable spring part <NUM> and the corresponding stationary contact <NUM> are stuck, the actuator <NUM> cannot be reset, so that the movable contacts <NUM> of the remaining groups of the movable spring parts <NUM> cannot be disconnected from the corresponding stationary contacts <NUM>, thereby achieving a forced guiding function.

The disconnection between the auxiliary movable contact of the auxiliary movable spring <NUM> and the auxiliary stationary contact of the auxiliary stationary spring <NUM> is realized by the driving portion <NUM> of the actuator <NUM> pushing the head of the auxiliary movable spring <NUM>. The connection between the auxiliary movable contact and the auxiliary stationary contact is realized by the reaction force of the auxiliary movable spring <NUM>. High insulation is achieved between the auxiliary contact part and the main contact part (namely contact unit). The auxiliary contact part can monitor the state of the main contact part, no matter which main contact is stuck, the auxiliary contact can't be closed, so as to realize the blocking function.

When the current is short-circuited, Holm force will be generated on the surfaces of the movable contact <NUM> and the stationary contact <NUM>, and the Holm force will cause the movable contact <NUM> and the stationary contact <NUM> to repel and separate; the U-shaped structure formed by the movable spring lead-out pin <NUM>, the rigid spring <NUM> and the flexible connector <NUM> will generate Lorentz force, the Lorentz force will cause the movable contact <NUM> to move closer to the stationary contact <NUM>, thereby restricting the movable contact <NUM> and the stationary contact <NUM> from repelling each other and separating.

In the electromagnetic relay for preventing arc short circuit of the present disclosure, at the side where the movable spring part <NUM> is located, the first baffle <NUM> of the first arc partition plate <NUM> and the partition plate <NUM> form two arc partition walls at the lower portion of the compartment <NUM>, the third baffle <NUM> on the inner side of the case <NUM> and the partition plate <NUM> form two arc partition walls located at the upper portion of the compartment <NUM>, combined with the design of the upper baffle <NUM>, the lower baffle <NUM> and the arc blocking portion <NUM>, the electromagnetic relay of the present disclosure forms two large arc partition walls A, B that can completely separate the adjacent compartments <NUM> at the side where the movable spring part <NUM> is located, as shown in <FIG>, the lines indicated by A and B in the figure indicate the directions of the large arc partition walls A and B, respectively. At the side where the stationary spring part <NUM> is located, since there is no actuator <NUM> installed, and the second opening <NUM> is smaller, it is completely closed by the second arc partition plate <NUM>, the second baffle <NUM> of the second arc partition plate <NUM> and the partition plate <NUM> form three small arc partition walls C, D, and E, as shown in <FIG>. Therefore, each compartment <NUM> of the present disclosure is in a relatively closed state. In addition, the two large arc partition walls A, B/three small arc partition walls C, D, and E complement each other respectively, even if one of the large arc partition walls or one of the small arc partition walls is not effective for arc partition, the other large arc partition wall or other small arc partition walls can be used to further isolate the arc. When the movable spring part <NUM> and the stationary spring part <NUM> are disconnected to generate an arc, the arc will not enter the adjacent compartment <NUM>, thereby not causing an arc short circuit and ensuring the safety of the electromagnetic relay of the present disclosure during operation.

In the electromagnetic relay for preventing arc short circuit of the present disclosure, the first arc partition plate <NUM> and the second arc partition plate <NUM> are both laterally inserted, so that the assembly sequence is simple, and automation is facilitated. In particular, the first baffle <NUM> of the first arc partition plate <NUM> and the second baffle <NUM> of the second arc partition plate <NUM> are respectively plugged into the opposite baffle plate <NUM>, so that the sealing manner between the first arc partition plate <NUM> and the baffle plate <NUM> and the sealing manner between the second arc partition plate <NUM> and the baffle plate <NUM> are simplified, and no arc leakage gap is ensured. The third baffle <NUM> is directly formed on the case <NUM>, so that the electromagnetic relay of the present disclosure can reduce the steps of assembling the third baffle <NUM>, thereby simplifying the assembly steps, similarly, the third baffle <NUM> is plugged into the opposite partition plate <NUM> to ensure that there is no arc leakage gap between the inner side of the case <NUM> and the partition plate <NUM>. The arrangement of the second arc blocking structure and/or the arc blocking portion <NUM> can ensure that there is no arc leakage gap between the adjacent compartments <NUM> at the first notches <NUM>, thereby further improving the arc isolation effect of the electromagnetic relay of the present disclosure.

Claim 1:
An electromagnetic relay for preventing arc short circuit, comprising:
a base (<NUM>) provided with a first accommodating cavity (<NUM>), wherein the first accommodating cavity (<NUM>) is provided with a plurality of partition plates (<NUM>) to divide the first accommodating cavity (<NUM>) into a plurality of compartments (<NUM>) distributed along a preset direction (D1), a side of the first accommodating cavity (<NUM>) is provided with a first opening (<NUM>) leading to each of the compartments (<NUM>);
a magnetic circuit part (<NUM>) installed on the base (<NUM>) and comprising an armature (<NUM>);
a contact part comprising a plurality of contact units corresponding to the plurality of compartments (<NUM>) one-to-one, wherein each of the plurality of contact units comprises a movable spring part (<NUM>) and a stationary spring part (<NUM>), and the movable spring part (<NUM>) and the stationary spring part (<NUM>) are installed in a corresponding compartment (<NUM>) and configured to cooperate with each other;
an actuator (<NUM>), wherein the armature (<NUM>) of the magnetic circuit part (<NUM>) are cooperated with the movable spring part (<NUM>) of each of the contact units by the actuator (<NUM>);
a first arc partition plate (<NUM>) configured to close all or part of the first opening (<NUM>), wherein an inner side of the first arc partition plate (<NUM>) is provided with a plurality of first baffles (<NUM>) distributed along the preset direction (D1), at least one first baffle (<NUM>) is laterally inserted into each compartment (<NUM>), and the first baffle (<NUM>) is configured to adjacent to or abut against a partition plate (<NUM>) of the compartment (<NUM>) to form at least two partition walls located between adjacent compartments (<NUM>), characterised by comprising:
a case (<NUM>) with an opening at a bottom, wherein the case (<NUM>) is connected with the base (<NUM>), and is configured to accommodate the magnetic circuit part (<NUM>), the contact part, the actuator (<NUM>) and the first arc partition plate (<NUM>) in a casing cavity of the case (<NUM>).