Magnetic Shield Structure of Relay Contact and Relay

Abstract

To provide a present invention in regard to a technical field of an electric device, by providing a magnetic shield structure of a relay contactor, and a relay.SOLUTION: A magnetic shield structure of a relay contactor, comprises: a contact assembly; a first magnetic shield member; a short circuit resistance assembly; and a permanent magnet. The contact assembly contains: a movable contactor; and a pair of fixing contact leading ends. The movable contactor is constructed so as to be contacted or separated to / from the pair of fixing contact leading ends. The short circuit resistance assembly is at least installed to the side directed to the fixing contact leading end of the movable contactor. In the case where a fault large current occurs in the movable contactor, it is constructed so that a suction force is generated to resist an electrically-driven repulsive power between the movable contactor and the fixing contact leading end. The permanent magnet is installed to the circumference of the contact assembly to realize an arc suppression by using a magnetic field formed by the permanent magnet. The first magnetic shield member is installed to an outside part of the fixing contact leading end, shields the magnetic field generated at the time of a power conduction of the fixing contact leading end, and sucks the magnetic field transmitted to the short circuit resistance assembly from the permanent magnet.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention generally relates to the technical field of electrical equipment, and particularly relates to a magnetic shield structure and a relay for a relay contact.

Background Art

[0002] A relay is usually an electronic control device applied to an automatic control circuit. A relay includes a control system and a controlled system. The control system is also called an input circuit, and the controlled system is also called an output circuit. A relay is essentially an "automatic switch" that uses a small current to control a large current, and plays roles such as automatic adjustment of a circuit, safety protection, and circuit conversion.

[0003] A high-voltage DC relay is a type of relay. Most existing high-voltage DC relays adopt a direct-acting structure of a movable contact. With the improvement of the cruising range requirements of new energy vehicles, usually, a reduction in the heat loss of the high-voltage DC relay is required. When the battery pack is short-circuited, since the battery capacity is higher, it is required to further increase the short-circuit current withstand and voltage of the relay. When the short-circuit load is very large, the contact of the high-voltage DC relay is repelled by the electrodynamic repulsive force due to the short-circuit current, and a contact arc is generated. Since the short-circuit current and voltage of the load are very high, intense arc combustion is instantaneously caused between the contacts.

[0004] To solve this problem, conventionally, there was no choice but to increase the size of the coil to improve the holding force of the movable iron core. However, under the requirements of the user for a small-sized and low-power consumption framework, it was impossible to realize an increase in the ampere-turn value of the coil. Just increasing the contact pressure could not achieve a reduction in the contact resistance of the contact and resistance to a large electrodynamic repulsive force.

Summary of the Invention

[0005] The present invention provides a magnetic shield structure and a relay for a relay contact that satisfy the needs of safety and weight reduction.

[0006] According to a first aspect of the present invention, there is provided a magnetic shield structure for a relay contact including a contact assembly, a first magnetic shield member, a short-circuit resistant assembly, and a permanent magnet. The contact assembly includes a movable contact and a pair of fixed contact leads, and the movable contact is configured to contact or separate from the pair of fixed contact leads. The short-circuit resistant assembly is at least installed on a side facing the fixed contact lead of the movable contact, and is configured to generate an attractive force when a large fault current occurs in the movable contact to resist the electrodynamic repulsive force between the movable contact and the fixed contact lead. The permanent magnet is installed around the contact assembly, and arc extinction is realized by utilizing the magnetic field formed by the permanent magnet. The first magnetic shield member is installed outside the fixed contact lead, and is configured to shield the magnetic field generated when the fixed contact lead is energized and absorb the magnetic field transmitted from the permanent magnet to the short-circuit resistant assembly.

[0007] In some of these embodiments, the permanent magnet is installed along the width direction of the movable contact.

[0008] In some of these embodiments, the number of the permanent magnets is two, and the two permanent magnets are respectively installed on both sides of the movable contact along the length direction of the movable contact, and are installed corresponding to the two first magnetic shield members. One of the two permanent magnets, one of the two first magnetic shield members, the short-circuit resistant assembly, the other one of the two first magnetic shield members, and the other one of the two permanent magnets are arranged in this order, and the magnetic pole direction of each permanent magnet is installed along the length direction of the movable contact.

[0009] In some of these embodiments, a restricting portion is installed on the outer wall of the fixed contact lead, and the restricting portion is used for restricting the first magnetic shield member.

[0010] In some of these embodiments, a fixing portion is installed on the side of the fixed contact lead towards the movable contact. The fixing portion is arranged to be able to contact the first magnetic shielding member while reversing in a direction away from the movable contact with respect to the fixed contact lead, and is used to fix the first magnetic shielding member.

[0011] In some of these embodiments, the fixing portion is a flange installed on the side of the fixed contact lead towards the movable contact.

[0012] In some of these embodiments, the fixed contact lead and the first magnetic shielding member are fixed by welding or screwing (fastening) or snap - fastening (fastening).

[0013] In some of these embodiments, the first magnetic shielding member is a closed - ring structure installed in a ring shape on the fixed contact lead, or the first magnetic shielding member is arranged at intervals in a ring shape around the fixed contact lead.

[0014] In some of these embodiments, the magnetic permeability of the first magnetic shielding member is greater than that of the fixed contact lead.

[0015] In some of these embodiments, a yoke clamp is provided outside the permanent magnet.

[0016] In some of these embodiments, the short - circuit - resistant assembly includes an upper magnetic conductor installed on the side of the movable contact close to the fixed contact lead, and a lower magnetic conductor installed on the side of the movable contact away from the fixed contact lead, and a magnetic conduction circuit is formed between the upper magnetic conductor and the lower magnetic conductor.

[0017] In some of these embodiments, a through hole is provided in the movable contact, and at least a part of the lower magnetic conductor is drilled in the through hole.

[0018] In some of these embodiments, the number of the upper magnetic conductors and the lower magnetic conductors is plural, a plurality of the upper magnetic conductors and a plurality of the lower magnetic conductors are installed correspondingly, and on the sides of two adjacent lower magnetic conductors close to each other, the through hole is drilled.

[0019] According to the second aspect of the present invention, a relay including the magnetic shield structure of the relay contact is further provided.

[0020] In some of these embodiments, a contact container is further included. The fixed contact lead-out end is installed in the contact container, at least a part of which is installed in the contact container, the first magnetic shield member of the magnetic shield structure of the relay contact is installed inside the contact container, and the permanent magnet is installed outside the contact container.

[0021] One embodiment of the present invention has the following advantages or beneficial effects: The magnetic shield structure of the relay contact provided by one embodiment of the present invention installs a first magnetic shield member outside the fixed contact lead-out end. The first magnetic shield member can shield the magnetic field generated when the fixed contact lead-out end is energized, so as to reduce the influence of the Ampere force on the movable contact. Thereby, the electrodynamic repulsive force between the fixed contact lead-out end and the movable contact is reduced, the risk that the movable contact is bounced and arcing occurs to cause an explosion is effectively avoided, the safety performance of the relay is improved, the relay is suitable for use in a working environment where a large short-circuit current flows through the load, and the service life of the relay is improved. At the same time, the first magnetic shield member is easily magnetized by the short-circuit current and corresponds to the upper magnetic conductor in the short-circuit resistant structure, and can generate an upward suction force on the movable contact, facilitating the movement of the movable contact in the direction close to the fixed contact lead-out end, maintaining reliable contact between the fixed contact lead-out end and the movable contact, and achieving the effect of short-circuit resistance.

[0022] The short-circuit resistant assembly is at least installed on the side facing the fixed contact lead-out end of the movable contact. The movable contact is interposed inside the short-circuit resistant assembly, a short-circuit ring structure is added to the movable contact, and a part of the magnetic field generated by the movable contact can be magnetically shielded to a certain extent. When a large fault current occurs in the movable contact, the short-circuit resistant assembly can form a magnetic conduction circuit to generate an attractive force. This attractive force serves to attract and pull the movable contact and is used to resist the electrodynamic repulsive force generated between the movable contact and the fixed contact lead-out end by the fault current. Thereby, the situation where the movable contact and the fixed contact lead-out end break away from each other, stretching the arc and causing an explosion is avoided, and the reliability and safety of the contact between the movable contact and the fixed contact lead-out end are ensured.

[0023] The first magnetic shielding member can absorb the magnetic field from the permanent magnet to the short-circuit resistant assembly, thereby reducing the influence of the permanent magnet on the short-circuit resistant assembly and improving the short-circuit resistant effect. Also, not only is the first magnetic shielding member itself magnetized, but it also absorbs the magnetic field of the permanent magnet. When a short-circuit current flows, the attractive force of the first magnetic shielding member on the movable contact increases accordingly, and thus the short-circuit resistant effect is further improved.

[0024] The relay provided by the embodiment of the present invention optimizes and installs the setting positions of the first magnetic shielding member, the permanent magnet, and the short-circuit resistant assembly. Since the first magnetic shielding member can absorb the magnetic field from the permanent magnet to the short-circuit resistant assembly, the influence of the permanent magnet on the short-circuit member can be reduced, and the short-circuit resistant effect can be improved. Also, by not only magnetizing the first magnetic shielding member itself but also absorbing the magnetic field of the permanent magnet, the attractive force of the first magnetic shielding member on the movable contact when a short-circuit current flows increases accordingly, and thus the short-circuit resistant effect is further improved.

Brief Description of the Drawings

[0025] To better understand the present invention, reference may be made to the embodiments shown in the following accompanying drawings. The components in the accompanying drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly explain the technical features of the present invention. Also, related elements or components may have different settings as known in the relevant technical field. Further, in the accompanying drawings, the same reference numerals indicate the same or similar components in various accompanying drawings. The above and other features and advantages of the present invention will become more apparent by describing its exemplary embodiments in detail with reference to the accompanying drawings.

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Embodiments for Carrying Out the Invention

[0026] The following will clearly and completely describe the technical solutions in the exemplary embodiments of the present invention in conjunction with the accompanying drawings in the exemplary embodiments of the present invention. The exemplary embodiments described herein are for illustrative purposes and are not intended to limit the protection scope of the present invention. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the protection scope of the present invention.

[0027] In the description of the present invention, unless specifically stipulated and limited otherwise, the terms "first" and "second" are used only for the purpose of description and cannot be understood as indicating or implying relative importance. The term "plurality" means two or more. The term "and / or" includes any combination and all combinations of one or more of the related listed items. In particular, referring to "the / a" object also intends to represent one of the possible plurality of such objects.

[0028] Unless specifically stipulated and limited otherwise, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "connection" may be a fixed connection, a removable connection, an integral connection, an electrical connection or a signal connection. "Connection" may be a direct connection or an indirect connection through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific situation.

[0029] Furthermore, in the description of the present invention, in the description of the exemplary embodiments of the present invention, directional terms such as "upper", "lower", "inner", "outer", etc. are described from the perspective shown in the accompanying drawings and should not be understood as limiting the exemplary embodiments of the present invention. Also, in the context, when an element or feature is referred to as being "connected" "above", "below", "inside", or "outside" of another element, it may be directly connected "above", "below", "inside", or "outside" of the other element or indirectly connected "above", "below", "inside", or "outside" of the other element through an intermediate medium.

[0030] Exemplary embodiments will be described in more detail with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Rather, by providing these embodiments, the present invention becomes comprehensive and complete, and can fully convey the idea of the exemplary embodiments to those skilled in the art. In the drawings, the same appended (reference) numerals indicate the same or similar structures, so these detailed descriptions will be omitted.

[0031] This embodiment mainly provides a magnetic shielding structure for a relay contact used in a high-voltage DC relay. As shown in FIGS. 1 to 3, the magnetic shielding structure of the relay contact includes a contact assembly 2, and the contact assembly 2 includes a movable contact 22 and a pair of fixed contact leads 21. The fixed contact leads 21 are installed in the contact container 1, and at least a part thereof enters the contact container 1. The movable contact 22 is installed in the contact container 1 and is used to contact or separate from the pair of fixed contact leads 21.

[0032] In the magnetic shielding structure of the relay contact according to the embodiment of the present invention, the fixed contact lead-out end 21 is installed in the contact container 1, and at least a part thereof enters the contact container 1. The contact container 1 provides a fixed position for the fixed contact lead-out end 21, and at the same time, the contact container 1 also provides an insulating environment for at least a part of the movable contact 22 and the fixed contact lead-out end 21 of the contact assembly 2. The movable contact 22 is used to contact or separate from the pair of fixed contact lead-out ends 21. When the movable contact 22 contacts the fixed contact at the bottom of the pair of fixed contact lead-out ends 21, current flows in from one fixed contact lead-out end 21, passes through the movable contact 22, and then flows out from the other fixed contact lead-out end 21, realizing the connection of the load.

[0033] Here, the distribution direction of the pair of fixed contact terminals 21 and the length direction of the movable contact 22 are defined as the first direction, the direction in which the fixed contact terminal 21 and the movable contact 22 come into contact and separate is defined as the third direction, and the direction orthogonal to the first direction and the third direction is defined as the second direction. Here, two of the first direction, the second direction, and the third direction are perpendicular to each other, and the first direction, the second direction, and the third direction only represent spatial directions and have no substantial meaning.

[0034] In one embodiment, as shown in FIGS. 2-3, the contact container 1 includes an insulating cover 11 and a flange member 12. The insulating cover 11 and the yoke plate enclose a contact cavity, and both the insulating cover 11 and the yoke plate are connected by the flange member 12. The contact cavity provides an insulating environment for the contact between the movable contact 22 and the fixed contact terminal 21.

[0035] When the short-circuit load is very large, under the action of the short-circuit current, an electro-dynamic repulsive force is generated between the movable contact 22 and the fixed contact terminal 21, causing the contact to bounce, generating a contact arc and burning violently, and even an explosion may occur.

[0036] To solve this problem, as shown in FIGS. 2-3, the magnetic shield structure of the relay contact provided in this embodiment further includes a first magnetic shield member 5. The first magnetic shield member 5 is installed outside the fixed contact terminal 21 and is used to shield the magnetic field generated when the fixed contact terminal 21 is energized.

[0037] Outside the fixed contact terminal 21, a first magnetic shielding member 5 is installed. The first magnetic shielding member 5 can shield the magnetic field generated when the fixed contact terminal 21 is energized, reduce the Ampere force acting on the movable contact 22, thereby reducing the electrodynamic repulsive force between the fixed contact terminal 21 and the movable contact 22, effectively avoiding the risk that the movable contact 22 is repelled and an arc is generated to cause an explosion, improving the safety performance of the relay, enabling the relay to be suitable for a working environment where a large short-circuit current passes through the load, and improving the service life. At the same time, the first magnetic shielding member 5 can be easily magnetized by the short-circuit current and generate an upward suction force on the movable contact 22, making it easier for the movable contact 22 to move in the direction of approaching the fixed contact terminal 21, ensuring the contact between the fixed contact terminal 21 and the movable contact 22, and obtaining the effect of short-circuit resistance.

[0038] As shown in FIGS. 2 to 3, the magnetic shielding structure of the relay contact provided in this embodiment further includes a short-circuit resistance assembly 3. The short-circuit resistance assembly 3 is at least installed on the side facing the fixed contact terminal 21 of the movable contact 22. The movable contact 22 generates a suction force when a large fault current occurs, and the short-circuit resistance assembly 3 is used to resist the electrodynamic repulsive force between the movable contact 22 and the fixed contact terminal 21.

[0039] The short-circuit resistant assembly 3 is provided on at least the upper side of the movable contact 22 along the axial direction of the fixed contact lead-out end 21, for example, on both sides of the movable contact 22 along the third direction, and the movable contact 22 is interposed inside the short-circuit resistant assembly 3, which corresponds to adding a short-circuit ring structure to the movable contact 22, and a part of the magnetic field generated in the movable contact 22 can be magnetically shielded to a certain extent. When a large fault current occurs in the movable contact 22, the short-circuit resistant assembly 3 can form a magnetic conduction circuit to generate an attractive force, and the attractive force plays a role of attracting and pulling the movable contact 22, reducing the repulsion of the magnetic field between the fixed contact lead-out end 21 and the movable contact 22, and is used to resist the electromotive repulsive force generated between the movable contact 22 and the fixed contact lead-out end 21 by the fault current. Thereby, the situation that the movable contact 22 and the fixed contact lead-out end 21 break away from each other and an arc is stretched to cause an explosion is avoided, and the reliability and safety of the contact between the movable contact 22 and the fixed contact lead-out end 21 are ensured.

[0040] As shown in FIGS. 2 to 3, the magnetic shielding structure of the relay contact provided in this embodiment further includes a permanent magnet 6, and the permanent magnet 6 is installed around the contact assembly 2, and arc extinguishing is realized by using the magnetic field formed by the permanent magnet 6.

[0041] The first magnetic shielding member 5 can absorb the magnetic field from the permanent magnet 6 to the short-circuit resistant assembly 3, that is, the magnetic field generated by the permanent magnet 6 is first absorbed by the first magnetic shielding member 5, thereby reducing the influence of the permanent magnet 6 on the short-circuit resistant assembly 3 and improving the short-circuit resistant effect. In addition, not only the first magnetic shielding member 5 itself is magnetized but also the magnetic field generated by the permanent magnet 6 is absorbed, so that the attractive force of the first magnetic shielding member 5 on the movable contact 22 when a short-circuit current flows also increases accordingly, and the short-circuit resistant effect is further improved.

[0042] In one embodiment, as shown in FIGS. 2 to 3, the permanent magnet 6 is installed along the width direction of the movable contact 22.

[0043] The permanent magnet 6 is installed along the width direction of the movable contact 22. At this time, the permanent magnet 6, the first magnetic shield member 5, and the short-circuit protection assembly 3 are installed at intervals along the first direction. The first magnetic shield member 5 is installed between the permanent magnet 6 and the short-circuit protection assembly 3. Therefore, the magnetic field generated by the permanent magnet 6 is preferentially absorbed by the first magnetic shield member 5. The first magnetic shield member 5 plays an effective isolation role, reducing the influence of the permanent magnet 6 on the short-circuit protection assembly 3 and improving the short-circuit protection effect. Since the first magnetic shield member 5 itself is magnetized and the magnetic field absorbed from the permanent magnet 6 is added, when a large short-circuit current occurs, the attractive force on the movable contact 22 can be increased, further improving the short-circuit protection effect.

[0044] In one embodiment, as shown in FIGS. 2 to 3, the number of the permanent magnets 6 is two. The two permanent magnets 6 are installed on both sides of the movable contact 22 along the length direction of the movable contact 22, corresponding to the two first magnetic shield members 5. The permanent magnet 6, the first magnetic shield member 5, and the short-circuit protection assembly 3 are installed along the length direction of the movable contact 22. One of the two permanent magnets 6, one of the two first magnetic shield members 5, and the short-circuit protection assembly 3, the other one of the two first magnetic shield members 5, and the other one of the two permanent magnets 6 are distributed in this order.

[0045] By adopting such a form, the two permanent magnets 6 are installed on both sides of the movable contact 22 along the first direction, that is, the two permanent magnets 6 are installed on the left and right instead of front and back. As a result, the pair of fixed contact leads 21 are brought closer by the permanent magnets 6 installed on the left and right. The two permanent magnets 6 and the two first magnetic shield members 5 are installed corresponding to each other. At this time, one of the permanent magnets 6, one of the first magnetic shield members 5, the short-circuit protection assembly 3, the other one of the first magnetic shield members 5, and the other one of the permanent magnets 6 are arranged in a substantially straight line (in a straight line). Therefore, the magnetic field of each permanent magnet 6 can be absorbed by one first magnetic shield 5, reducing the influence on the short-circuit assembly 3.

[0046] In one embodiment, the magnetic pole directions of each permanent magnet 6 are arranged along the length of the movable contact 22. That is, the N poles and S poles of each permanent magnet 6 are distributed along the length direction of the movable contact 22, and the arc extinguishing space becomes larger.

[0047] In one embodiment, the permanent magnet 6 may also be called arc extinguishing magnet steel.

[0048] Two permanent magnets 6 are arranged opposite to each other, with the N pole and S pole facing each other, and the polarities of the opposing surfaces of the two permanent magnets 6 are opposite to each other. That is, the left surface of the permanent magnet 6 located on the left side of the insulating cover 11 is the S pole, and the right surface is the N pole. The left surface of the permanent magnet 6 located on the right side of the insulating cover 11 is the S pole, and the right surface is the N pole. Of course, it is also possible to design the polarities of the opposing surfaces of the two permanent magnets 6 to be the same. For example, the left surface of the permanent magnet 6 located on the left side of the insulating cover 11 is the S pole, and the right surface is the N pole. The left surface of the permanent magnet 6 located on the right side of the insulating cover 11 is the N pole, and the right surface is the S pole.

[0049] In this way, by installing two permanently installed permanent magnets 6 facing each other, a magnetic field can be formed around the contact assembly 2. According to the principle that charged particles are deflected by the Lorentz force in the magnetic field, the arc can be extended and the arc can be extinguished, and the effect of arc extinguishing by magnetic blow can be obtained. Further, due to the action of the magnetic fields of the two permanent magnets 6, the arcs generated by the separation of the two fixed contact leads 21 and the movable contact 22 are quickly pulled away in the corresponding directions. Specifically, when the polarities of the two permanent magnets 6 are the same and facing each other, the arcs generated by the separation of the two fixed contact leads 21 and the movable contact 22 are blown to the same side. When the polarities of the two permanent magnets 6 are the same and not facing each other, the arcs generated by the separation of the two fixed contact leads 21 and the movable contact 22 are blown to different sides.

[0050] In one embodiment, outside the permanent magnet 6, a yoke clamp 7 is provided, and the yoke clamp 7 serves as a magnetic conductor.

[0051] Specifically, the yoke clamp 7 is made of a soft magnetic material. The soft magnetic materials include, but are not limited to, iron, cobalt, nickel, and their alloys. The two yoke clamps 7 are installed corresponding to the positions of the two permanent magnets 6, and the two yoke clamps 7 surround the insulating cover 11 and the two permanent magnets 6. Since the yoke clamp 7 surrounds the permanent magnet 6, it is possible to avoid the magnetic field generated in the permanent magnet 6 from diffusing to the outside and affecting the arc extinguishing effect.

[0052] In one example, the magnetic permeability of the first magnetic shield member 5 is greater than that of the fixed contact lead-out end 21. Here, the fixed contact lead-out end 21 uses a metal material such as copper or a copper alloy, and the first magnetic shield member 5 is made of a magnetic conductive material such as electrolytic iron. When the fixed contact lead-out end 21 generates an induced magnetic field during energization, when the magnetic induction line enters the first magnetic shield member 5 from the air, a large deviation occurs in the magnetic induction line and converges strongly, thereby forming a better magnetic shielding effect.

[0053] It should be understood that the first magnetic shield member 5 is sleeved on the fixed contact lead-out end 21, and the first magnetic shield member 5 includes, but is not limited to, a cylindrical shape, an elliptical cylindrical shape, a square cylindrical shape, and a polygonal cylindrical shape.

[0054] In one embodiment, the first magnetic shield member 5 has a closed ring structure installed in a ring shape on the fixed contact lead-out end 21, or the first magnetic shield member 5 is distributed at intervals in a ring shape around the fixed contact lead-out end 21.

[0055] Specifically, the first magnetic shield member 5 may have an integral structure. For example, the first magnetic shield member 5 is sleeved in an integral cylindrical or ring shape outside the fixed contact lead-out end 21, adopting an integral molding structure, reducing the process of assembling parts, and having a relatively low manufacturing cost.

[0056] Specifically, the first magnetic shield member 5 may have a split structure. The first magnetic shield member 5 includes a plurality of magnetic shield units, and the plurality of magnetic shield units are installed along the circumferential direction of the fixed contact lead-out end 21 and can be joined end to end to form a structure such as a cylindrical shape or a polygonal cylindrical shape. Also, in some other embodiments, the plurality of magnetic shield units can be distributed at intervals in a ring shape surrounding the outside of the fixed contact lead-out end 21, and it is also possible to set a single magnetic shield unit outside the fixed contact lead-out end 21. As long as a magnetic shielding effect can be obtained, this embodiment is not limited in this specification.

[0057] In one embodiment, as shown in FIGS. 4 to 5, a restricting portion is installed on the outer wall of the fixed contact lead-out end 21, and this restricting portion is used for restricting the first magnetic shield member 5.

[0058] A restricting portion is installed on the outer wall of the fixed contact lead-out end 21. When the first magnetic shield member 5 is mounted on the fixed contact lead-out end 21, the restricting portion can perform an initial positioning on the first magnetic shield member 5 and can improve the mounting accuracy of the first magnetic shield member 5. At the same time, the restricting portion can restrict the first magnetic shield member 5 and prevent the first magnetic shield member 5 from falling.

[0059] Here, the restricting portion may be a stop step, a ring-shaped positioning groove, a positioning protrusion, etc. installed on the fixed contact lead-out end 21. As long as the positioning of the first magnetic shield member 5 with respect to the fixed contact lead-out end 21 can be realized, it belongs to the protection scope of this embodiment. Of course, in some other embodiments, the restricting portion may be provided on the inner wall of the top of the contact container 1, and the restricting of the first magnetic shield member 5 may be realized by the fixed contact lead-out end 21 extending partially into the contact container 1.

[0060] In one embodiment, the fixed contact lead-out terminal 21 is provided with a fixing portion on the side facing the movable contact 22. The fixing portion is arranged to be able to abut against the first magnetic shielding member 5 while reversing in a direction away from the movable contact 22 with respect to the fixed contact lead-out terminal 21, and is used to fix the first magnetic shielding member 5.

[0061] The fixed contact lead-out terminal 21 is provided with a fixing portion on the side facing the movable contact 22, which corresponds to providing a fixing portion at the bottom of the fixed contact lead-out terminal 21. If the fixing portion is fixedly provided with respect to the fixed contact lead-out terminal 21, the mounting of the first magnetic shielding member 5 to the fixed contact lead-out terminal 21 may be restricted by the large-sized fixing portion, or although the mounting of the first magnetic shielding member 5 to the fixed contact lead-out terminal 21 is not restricted by the small-sized fixing portion, there may be a situation where the fixing effect becomes unstable.

[0062] Therefore, the fixing portion provided in this embodiment is movably installed with respect to the fixed contact lead-out terminal 21. Before the first magnetic shielding member 5 is mounted, the fixing portion extends along the axial direction of the fixed contact lead-out terminal 21, or the angle formed with the axial direction of the fixed contact lead-out terminal 21 is relatively small, making it easier for the first magnetic shielding member 5 to pass through the fixing portion and be sleeved outside the fixed contact lead-out terminal 21. After the first magnetic shielding member 5 is sleeved on the fixed contact lead-out terminal 21, the fixing portion is reversed in a direction away from the movable contact 22 by means of an expanding riveting, so that the fixing portion is bent upward. After the fixing portion contacts the first magnetic shielding member 5, by pressing the fixing portion against the first magnetic shielding member 5, the fixing of the first magnetic shielding member 5 can be realized. By this caulking method, the fixing portion does not restrict the insertion of the first magnetic shielding member 5 into the fixed contact lead-out terminal 21. At the same time, the fixing effect between the first magnetic shielding member 5 and the fixed contact lead-out terminal 21 can be ensured, and the connection can be made more convenient and reliable.

[0063] In one embodiment, the fixing portion is a flange installed on the side facing the movable contact 22 of the fixed contact lead-out end 21. Here, the flange can also be called a side edge, a corrugated edge, etc. The fixed contact lead-out end 21 can realize the fixation of the first magnetic shielding member 5 by using a foldable flange, with a simple structure, convenience, and relatively low manufacturing cost.

[0064] In one embodiment, the fixed contact lead-out end 21 and the first magnetic shielding member 5 are fixed by welding or screwing or snap-fitting.

[0065] Specifically, an external thread is installed on the outer wall of the fixed contact lead-out end 21, and an internal thread is installed on the inner wall of the first magnetic shielding member 5. That is, the first magnetic shielding member 5 has a nut structure, and the external thread is screwed into the internal thread, enabling a removable connection between the fixed contact lead-out end 21 and the first magnetic shielding member 5.

[0066] Specifically, a snap projection is provided on one of the outer wall of the fixed contact lead-out end 21 and the inner wall of the first magnetic shielding member 5, and a snap groove is provided on the other. By snap-fitting the snap projection into the snap groove, snap-fitting fixation between the fixed contact lead-out end 21 and the first magnetic shielding member 5 is realized.

[0067] Specifically, it is also possible to fix the space between the fixed contact lead-out end 21 and the first magnetic shielding member 5 by welding such as brazing. The process is simple and the manufacturing cost is also relatively low.

[0068] In one embodiment, as shown in FIGS. 2 to 3, the short-circuit resistant assembly 3 includes an upper magnetic conductor 31 and a lower magnetic conductor 32. The upper magnetic conductor 31 is installed on the side close to the fixed contact lead-out end 21 of the movable contact 22, and the lower magnetic conductor 32 is installed on the side away from the fixed contact lead-out end 21 of the movable contact 22. The magnetic conduction circuit is formed between the upper magnetic conductor 31 and the lower magnetic conductor 32, and is used to generate an attractive force when a large fault current occurs in the movable contact 22 and resist the electro-dynamic repulsive force between the movable contact 22 and the fixed contact lead-out end 21. Here, the upper magnetic conductor 31 and the lower magnetic conductor 32 can be made of materials such as iron, cobalt, nickel, and their alloys.

[0069] The lower magnetic conductor 32 is fixed below the movable contact 22. By moving the lower magnetic conductor 32 together with the movable contact 22 in the direction close to the fixed contact lead-out end 21, a magnetic conduction circuit can be formed between the upper magnetic conductor 31 and the lower magnetic conductor 32. When a large fault current occurs in the movable contact 22, the upper magnetic conductor 31 is located above the movable contact 22, the lower magnetic conductor 32 is located below the movable contact 22, and the movable contact 22 is sandwiched between the two magnets of the upper magnetic conductor 31 and the lower magnetic conductor 32. Therefore, when the upper magnetic conductor 31 generates an attractive force on the lower magnetic conductor 32, the attractive force plays a role of attracting and pulling the movable contact 22, and is used to resist the electro-dynamic repulsive force generated by the fault current between the movable contact 22 and the fixed contact lead-out end 21. Thereby, the situation where the movable contact 22 and the fixed contact lead-out end 21 are separated from each other, the arc is stretched, and an explosion occurs can be avoided, and the reliability and safety of the contact between the movable contact 22 and the fixed contact lead-out end 21 can be ensured.

[0070] In some other embodiments, the upper magnetic conductor 31 may have a straight structure. The upper magnetic conductor 31 is installed corresponding to the position between the two movable contacts of the movable contact 22. In order to match and correspond the upper magnetic conductor 31 with the lower magnetic conductor 32, the upper magnetic conductor 31 may extend along the width direction of the movable contact 22. The lower magnetic conductor 32 has a U-shaped structure. The opening of the lower magnetic conductor 32 is provided facing the movable contact 22, and the two side arms of the lower magnetic conductor 32 extend in the direction of the upper magnetic conductor 31. Thus, the two side arms of the lower magnetic conductor 32 can respectively form a surrounding magnetic conductive ring along the width direction of the movable contact 22 by being close to or in contact with the two ends of the upper magnetic conductor 31. Since both ends along the length direction of the movable contact 22 are movable contacts, they do not interfere with the surrounding magnetic conductive ring formed along the width direction of the movable contact 22. When a large fault current occurs in the movable contact 22, an electromagnetic attraction force is generated in the pressing direction of the movable contact, so as to counteract the electrodynamic repulsive force generated between the movable contact 22 and the fixed contact lead-out end 21 due to the fault current.

[0071] In one embodiment, as shown in FIGS. 2 to 3, a through hole 221 is installed in the movable contact 22, and at least a part of the lower magnetic conductor 32 is drilled through the through hole 221.

[0072] By this method, the movable contact 22 provides the mounting and fixing positions of the lower magnetic conductor 32, thereby improving the fixing effect between the movable contact 22 and the lower magnetic conductor 32. Since the lower magnetic conductor 32 is similar to a U-shaped structure, the opening of the lower magnetic conductor 32 is provided facing the movable contact 22. One side arm of the lower magnetic conductor 32 is wrapped around the long side of the movable contact 22, and the other side arm is drilled through the through hole 221.

[0073] In one embodiment, the number of the upper magnetic conductors 31 and the lower magnetic conductors 32 is plural. The plural upper magnetic conductors 31 and the plural lower magnetic conductors 32 are installed corresponding to each other. The adjacent sides of two adjacent lower magnetic conductors 32 that are close to each other are drilled through the through hole 221.

[0074] By installing a plurality of upper magnetic conductors 31 and a plurality of lower magnetic conductors 32 correspondingly, the magnetic attraction effect between the upper magnetic conductor 31 and the lower magnetic conductor 32 is enhanced, and the role of attracting and pulling the movable contact 22 is further improved, so as to counteract the electrodynamic repulsive force generated between the movable contact 22 and the fixed contact lead-out end 21 due to the fault current.

[0075] For example, the number of the upper magnetic conductor 31 and the lower magnetic conductor 32 is two. The side arms of the two lower magnetic conductors 32 close to each other penetrate through the through hole 221 at the same time, so as to realize the installation of the two lower magnetic conductors 32 by using the same through hole 221, reducing the manufacturing cost and the assembly difficulty.

[0076] Also, as shown in FIGS. 6 to 8, in this embodiment, a relay further including the magnetic shield structure of the relay contact described above is provided.

[0077] The relay provided in this embodiment is installed by optimizing the setting positions of the first magnetic shield member 5, the permanent magnet 6, and the short-circuit-proof assembly 3. The first magnetic shield member 5 can absorb the magnetic field from the permanent magnet 6 to the short-circuit-proof assembly 3. That is, the magnetic field generated in the permanent magnet 6 is first attracted by the first magnetic shield member 5, thereby reducing the influence of the permanent magnet 6 on the short-circuit-proof assembly 3 and improving the short-circuit-proof effect. In addition, not only the first magnetic shield member 5 itself is magnetized, but also the magnetic field of the permanent magnet 6 is adsorbed, and the attractive force of the first magnetic shield member 5 on the movable contact 22 when a short-circuit current flows also increases accordingly, thus further improving the short-circuit-proof effect.

[0078] In one embodiment, as shown in FIGS. 6 to 8, the relay further includes a contact container 1. The first magnetic shield member 5 of the magnetic shield structure of the relay contact is installed inside the contact container 1, the permanent magnet 6 is installed outside the contact container 1, and the permanent magnet 6 is installed between the yoke clamp 7 and the contact container 1.

[0079] The first magnetic shielding member 5 is installed inside the contact container 1. That is, the first magnetic shielding member 5 is sleeved outside the portion of the fixed contact lead-out end 21 that is located inside the contact container 1. Since the first magnetic shielding member 5 and the permanent magnet 6 are installed corresponding to the inside and outside of the contact container 1 respectively, the contact container 1 serves to isolate the permanent magnet 6 and the short-circuit-proof assembly 3 to a certain extent.

[0080] In one embodiment, as shown in FIGS. 6 to 8, the relay further includes a push assembly 4. The push assembly 4 includes a push rod 411, a base 412, an elastic member 43, and a U-shaped bracket 42. The upper portions of the base 412 and the push rod 411 can form a push rod unit 41 by integrally injection molding. The bottom of the U-shaped bracket 42 is fixedly connected to the base 412. The U-shaped bracket 42 and the base 412 enclose to form a frame structure. The movable contact 22 and the elastic member 43 are installed within the frame structure formed by enclosing the U-shaped bracket 42 and the base 412. One end of the elastic member 43 abuts against the base 412, and the other end abuts against the movable contact 22. The elastic member 43 can apply an elastic force so that the movable contact 22 has a tendency to move away from the base 412 and approach the fixed contact lead-out end 21.

[0081] The relay further includes an electromagnet unit 44. The electromagnet unit 44 is installed on the side away from the insulating cover 11 of the yoke plate and surrounds the metal cover. The push rod unit 41 is drivably connected to the electromagnet unit 44. The push rod unit 41 is movably installed within the electromagnet unit 44 and is connected to the movable contact 22 through the via hole of the yoke plate. When the electromagnet unit 44 is energized, the push rod unit 41 can be driven to move. As a result, by driving the movable contact 22 to move, it is possible to make contact with or separate from the fixed contact lead-out end 21.

[0082] The electromagnet unit 44 includes a coil bobbin 441, a coil 442, a fixed iron core 444, and a movable iron core 443. The coil bobbin 441 is in a hollow cylindrical shape and is formed using an insulating material. The metal cover is bored through the coil bobbin 441, and the coil 442 surrounds the coil bobbin 441. The fixed iron core 444 is fixedly installed within the metal cover, and a part of the fixed iron core 444 extends into the via hole. The fixed iron core 444 has a first perforation, and the first perforation is installed corresponding to the position of the via hole and is used for the push rod unit 41 to be bored through. The movable iron core 443 is movably installed within the metal cover and is installed facing the fixed iron core 444. The movable iron core 443 is connected to the push rod unit 41 such that when the coil 442 is energized, it is attracted to the fixed iron core 444. The movable iron core 443 and the push rod unit 41 can be connected by screwing, caulking, welding, or other means.

[0083] The relay provided by this embodiment operates as follows: When the coil 442 is energized, the movable iron core 443 moves upward, driving the push rod unit 41 to move upward. Due to the pushing action of the push rod unit 41, the movable contacts at both ends of the movable contact 22 come into contact with each of the two fixed contact leads 21.

[0084] When the current in the coil 442 is cut off, the movable iron core 443 drives the push rod unit 41 to move downward, and the movable contacts at both ends of the movable contact 22 separate from the two fixed contact leads 21.

[0085] It should be noted here that the relay illustrated in the accompanying drawings and described in this specification is merely an example of the use of the principle of the present invention. It should be clearly understood by those skilled in the art that the principle of the present invention is not limited to any details or any components of the devices illustrated in the accompanying drawings or described in this specification.

[0086] It should be understood that the present invention is not limited in its application to the detailed structures and installation forms of the members shown herein. The present invention can have other embodiments and can be realized and executed in various ways. The aforementioned variations and modifications are included within the scope of the present invention. It should be understood that the present invention disclosed and limited herein extends to all alternative combinations of two or more individual features mentioned or apparent in this specification and / or the accompanying drawings. All of these various combinations constitute multiple alternative aspects of the present invention. The embodiments described herein show the best-known method for realizing the present invention and enable those skilled in the art to utilize the present invention.

[0087] Other embodiments of the present invention will readily occur to those skilled in the art after considering this specification and practicing the inventions disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention, including known general knowledge or conventional technical means in the technical field not disclosed herein, in accordance with the general principles of the present invention. This specification and the exemplary embodiments are to be considered as illustrative only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0088] It should be understood that the present invention is not limited to the exact structures described above and illustrated in the accompanying drawings, and various modifications and changes are possible without departing from its scope. The protection scope of the present invention is limited only by the appended claims.

Description of Reference Numerals

[0089] 1, contact container; 2, contact assembly; 3, short-circuit-resistant assembly; 4, push assembly; 5, first magnetic shield member; 6, permanent magnet; 7, yoke clamp 11, insulating cover; 12, flange member 21, fixed contact lead-out end 22, movable contact; 221, through-hole 31, upper magnetic conductor; 32, lower magnetic conductor 41. Push rod unit, 411. Push rod, 412. Base 42. U-shaped bracket 43. Elastic member 44. Electromagnet unit, 441. Coil bobbin, 442. Coil, 443. Movable iron core, 444. Fixed iron core

Claims

1. A magnetic shield structure for a relay contact, comprising a contact assembly, a first magnetic shield member, a short-circuit-resistant assembly, and a permanent magnet, The contact assembly includes a movable contact and a pair of fixed contact lead ends, the movable contact being configured to be in contact with or spaced apart from the pair of fixed contact lead ends; The short-circuit-resistant assembly is installed at least on a side of the movable contact facing the fixed contact pull-out end, and is configured to generate an attractive force when a large fault current occurs in the movable contact, thereby resisting an electromechanical repulsive force between the movable contact and the fixed contact pull-out end; The permanent magnet is disposed around the contact assembly, and a magnetic field formed by the permanent magnet is utilized to realize arc extinction; the first magnetic shield member is disposed outside the fixed contact pull-out end and configured to shield a magnetic field generated by the fixed contact pull-out end when a current is applied thereto and to absorb a magnetic field transmitted from the permanent magnet to the short-circuit-proof assembly; The number of the permanent magnets is two, the two permanent magnets are respectively installed on both sides of the movable contactor along the length direction of the movable contactor, and are installed corresponding to the two first magnetic shield members, and along the length direction of the movable contactor, one of the two permanent magnets, one of the two first magnetic shield members, the short-circuit-resistant assembly, the other one of the two first magnetic shield members, and the other one of the two permanent magnets are arranged in this order, and the magnetic pole direction of each of the permanent magnets is arranged along the length direction of the movable contactor.

2. A magnetic shield structure for a relay contact comprising:

2. The length of the permanent magnet is set along the width direction of the movable contact.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

3. A restricting portion is provided on an outer wall of the fixed contact lead-out end, and the restricting portion is used to restrict the first magnetic shield member.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

4. A fixing portion is provided on the side of the fixed contact drawn-out end facing the movable contactor, and the fixing portion is arranged so as to be able to abut against the first magnetic shield member while being inverted in a direction away from the movable contactor with respect to the fixed contact drawn-out end, and is used to fix the first magnetic shield member.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

5. The fixed portion is a flange provided on the side of the fixed contact lead-out end facing the movable contact.

5. The magnetic shield structure of claim 4.

6. The fixed contact lead end and the first magnetic shield member are fixed to each other by welding, screwing, or snapping.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

7. The first magnetic shield member has a closed ring structure that is arranged in a ring shape on the fixed contact lead-out end, or The first magnetic shield members are arranged at intervals around the fixed contact lead end in a ring shape.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

8. The magnetic permeability of the first magnetic shield member is greater than the magnetic permeability of the fixed contact lead end.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

9. A yoke clamp is provided on the outside of the permanent magnet.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

10. The short circuit tolerant assembly includes: an upper magnetic conductive body disposed on a side of the movable contact closer to the fixed contact lead-out end; a lower magnetic conductive body provided on a side of the movable contactor away from the fixed contact lead-out end, A magnetic circuit is formed between the upper magnetic body and the lower magnetic body.

2. The magnetic shield structure of claim 1, wherein the magnetic shield structure is a contact for a relay.

11. The movable contactor is provided with a through hole, and at least a portion of the lower magnetic conductive body is drilled into the through hole.

11. The magnetic shield structure of a relay contact according to claim 10.

12. The number of the upper magnetic bodies and the lower magnetic bodies is plural, and the upper magnetic bodies and the lower magnetic bodies are arranged corresponding to each other, and the through holes are formed on the mutually adjacent sides of the two adjacent lower magnetic bodies.

12. The magnetic shield structure of a relay contact according to claim 11.

13. A relay contact comprising the magnetic shield structure according to any one of claims 1 to 12. A relay characterized by:

14. further comprising a contact vessel; The fixed contact lead end is installed in the contact container and at least a portion of the fixed contact lead end is installed inside the contact container, the first magnetic shield member of the magnetic shield structure of the relay contact is installed inside the contact container, and the permanent magnet is installed outside the contact container.

14. A relay as claimed in claim 13.

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