relay

Abstract

To provide a relay in regard to a technical field of an electric device.SOLUTION: A relay contains a contact assembly. The contact assembly contains a movable contactor and a pair of fixing contact leading ends. The movable contactor is used for being contacted or separated to / from the pair of fixing contact leading ends. In at least one of sides where each fixing contact leading end and the movable contactor approach each other, an inner side contact part is provided, and a space between each fixing contact leading end and the movable contactor are only contacted. The inner side contact part is installed to the side where the pair of fixing contact leading ends approach each other, a contact position between each fixing contact leading end and the movable contactor approaches a contraction current region of a center of the movable contact as possible. Also, by concentrating it into the inner side of each fixing contact leading end, an electrically-driven repulsive power is reduced by miniaturizing the size of a concentration region, and a risk of an arc combustion due to a burst of each fixing contact leading end and the movable contactor is reduced to improve safety.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates generally to the technical field of power equipment, and more particularly to relays. [Background technology]

[0002] A relay is an electronic control element, usually applied in automatic control circuits. A relay includes a control system and a controlled system, where the control system is also called the input circuit and the controlled system is also called the output circuit. A relay is actually an "automatic switch" that controls a large current with a small current. Therefore, in the circuit, it plays the role of automatic adjustment, safety protection, conversion circuit, etc.

[0003] A high-voltage DC relay is a type of relay, and most existing high-voltage DC relays use a moving contact direct-acting structure. As the demand for longer driving range for new energy vehicles increases, the heat loss of high-voltage DC relays must be reduced under normal circumstances. However, when the battery pack is short-circuited and the battery capacity is higher, the relay's short-circuit current and voltage resistance must be further increased. When the short-circuit load is large, the electromotive repulsive force caused by the short-circuit current will cause the contacts of the high-voltage DC relay to pop, generating an arc at the contacts. The high short-circuit current and voltage of the load will cause an instantaneous and intense arc burning between the contacts.

[0004] The only solution to this problem in the past was to increase the size of the coil and increase the holding force of the movable iron core, but given user demands for miniaturization and low power consumption, it was not possible to increase the coil's ampere-turn value, and simply increasing the contact pressure was not enough to reduce the contact resistance and resist the large electromechanical repulsive force. Summary of the Invention

[0005] The present invention provides a relay that meets the requirements for safety and light weight.

[0006] According to one aspect of the present invention , contact a relay including a point assembly; The contact assembly includes a movable contact and a pair of fixed contact leads. ,before the movable contact is used to contact or separate from the pair of fixed contact lead-out ends, An inner contact portion is provided on at least one of the sides where the fixed contact pull-out end and the movable contactor are close to each other, and contact between the fixed contact pull-out end and the movable contactor is made only by the inner contact portion, and the inner contact portion is installed on the sides where the pair of fixed contact pull-out ends are close to each other.

[0007] In some embodiments, the bottom of the fixed contact lead end relative to the movable contact the end surface facing the movable contact The projected area is equal to or smaller than the projected area of ​​the center of the drawn-out end of the fixed contact relative to the movable contact.

[0008] In some embodiments, the inner contact portion is provided between centerlines of the pair of fixed contact lead-out ends.

[0009] In some embodiments, a projection of the inner contact portion onto the movable contact. area is a projection of the bottom of the fixed contact lead-out end onto the movable contact area Smaller than.

[0010] In some embodiments, the fixed contact pull-out end has a groove at the bottom of one end closer to the movable contactor, and the inner contact portion is a portion of the fixed contact pull-out end that does not have the groove and is located on the sides of the pair of fixed contact pull-out ends that are close to each other.

[0011] In some embodiments, the cross-sectional shape of the groove is any one of a circle, an ellipse, an oblong hole, and a polygon, or The recessed groove is provided at the fixed contact lead-out end and has a through groove structure extending along the width direction of the movable contact.

[0012] In some embodiments, the inner contact portion is a boss protruding from the side of the movable contactor closer to the fixed contact pull-out end, and at least a portion of the boss is located on the sides of the pair of fixed contact pull-out ends that are close to each other.

[0013] In some embodiments, the length of the movable contact is less than the distance between outer edges of the grooves corresponding to the pair of fixed contact lead-out ends.

[0014] In some embodiments, the movable contact includes a thrust portion and two extension portions; the thrust portion is provided between the pair of fixed contact lead-out ends, the two extension portions are provided on both sides of the thrust portion and are in contact with the pair of fixed contact lead-out ends, Here, the projection of the inner contact portion onto the reference plane area is the projection of the extension onto the reference plane area and the reference plane is the plane on which the upper surface of the thrust portion is located.

[0015] In some embodiments, the extension is tapered; The inner contact portions are arranged to approach the sides of the pair of fixed contact lead-out ends that are closer to each other. The small end of the extension is positioned away from the thrust portion.

[0016] In some embodiments, the extension portion has an arc-shaped structure at least on the side facing the fixed contact lead-out end, and the inner contact portion is adjacent to the sides of the pair of fixed contact lead-out ends that are adjacent to each other.

[0017] In some embodiments, both sides of the inner contact portion are arranged parallel to each other along the width direction of the movable contactor.

[0018] In some embodiments, both sides of the thrust portion are planar along the axial direction of the fixed contact lead-out end.

[0019] In some embodiments, the electrical connector further includes a short-circuit-proof assembly provided at least on a side of the thrust portion that is closer to the fixed contact lead-out end.

[0020] In some embodiments, the short-circuit tolerant assembly comprises: an upper magnetic conductive body provided on a side of the thrust portion close to the fixed contact lead-out end; a lower magnetic conductive body provided on a side of the thrust portion farther from the fixed contact lead-out end, A magnetic circuit is formed between the upper magnetic body and the lower magnetic body, and when a large fault current flows through the movable contact, an attractive force is generated to resist the electromotive repulsive force between the movable contact and the fixed contact lead-out end.

[0021] In some embodiments, the thrust portion has a through hole, and at least a portion of the lower magnetic conductive body is drilled through the through hole.

[0022] In some embodiments, the number of the upper magnetic bodies and the lower magnetic bodies is plural, and a plurality of the upper magnetic bodies and a plurality of the lower magnetic bodies are provided correspondingly, and the sides of two adjacent lower magnetic bodies that are close to each other are drilled into the through hole.

[0023] The embodiments of the present invention have the following advantages or beneficial effects.

[0024] In a relay according to an embodiment of the present invention, the fixed contact pull-out ends are mounted on the contact receptacle and extend at least partially within the contact receptacle, and the contact receptacle provides a fixed position for the fixed contact pull-out ends and an insulating environment for at least a portion of the movable contacts and the fixed contact pull-out ends of the contact assembly. The movable contact is used to make contact with or separate from the pair of fixed contact pull-out ends, and when the movable contact contacts the fixed contacts at the bottom of the pair of fixed contact pull-out ends, a current flows in from one of the fixed contact pull-out ends, passes through the movable contact, and then flows out from the other fixed contact pull-out end, thereby connecting a load.

[0025] The fixed contact pull-out end and the movable contactor are in contact with each other at the inner contact portion, forming a path for current flow between them. The inner contact portion is installed on the adjacent sides of the pair of fixed contact pull-out ends, and the contact position between the fixed contact pull-out end and the movable contactor is close to the center line of the movable contactor, which is along the longitudinal direction of the movable contactor. Furthermore, in accordance with the path for current flow between the fixed contact pull-out end and the movable contactor, the contact position is as close as possible to the center line area of ​​the movable contactor and concentrated inside the fixed contact pull-out end. This reduces the electromotive repulsive force, reduces the risk of arc burning due to the fixed contact pull-out end and the movable contactor repelling each other, and improves safety. At the same time, the electromotive repulsive force can be reduced without increasing the volume or size, thereby meeting the demand for lighter weight. [Brief explanation of the drawings]

[0026] For a better understanding of the present invention, please refer to the examples shown in the following figures. The parts in the figures are not necessarily to scale, and related elements may be omitted to highlight and clearly show the technical features of the present invention. Furthermore, related elements or parts may have different configurations as known in the art. Also, in the figures, the same reference numerals represent the same or similar parts in each figure. The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments of the present invention with reference to the accompanying drawings. [Figure 1] 1 shows an exploded schematic view of a relay provided by a first embodiment of the present invention; [Figure 2] FIG. 2 shows an exploded schematic view of a contact assembly in a relay provided by Example 1 of the present invention. [Figure 3] FIG. 2 shows a cross-sectional view of a contact assembly in a relay provided by a first embodiment of the present invention. [Figure 4] FIG. 2 shows a schematic diagram of a current when a contact assembly in a relay provided by Example 1 of the present invention makes contact; [Figure 5] 1 shows a schematic structural diagram of a contact assembly in a relay provided by Example 1 of the present invention. [Figure 6] 2 shows a schematic structural diagram of a contact assembly in a relay provided by Example 1 of the present invention. [Figure 7] FIG. 2 is a schematic diagram showing the relative positions of a contact assembly and an inner contact in a relay provided by Example 1 of the present invention. [Figure 8] 1 shows a schematic structural diagram 1 illustrating a recessed groove in a relay provided by a first embodiment of the present invention. [Figure 9] 2 shows a schematic structural diagram of a recessed groove in a relay provided by Example 1 of the present invention. [Figure 10] 3 shows a schematic structural diagram of a recessed groove in a relay provided by the first embodiment of the present invention. [Figure 11] 1 shows a schematic structural diagram of a relay provided by a first embodiment of the present invention; [Figure 12] FIG. 1 is a cross-sectional view of a relay provided by a first embodiment of the present invention. [Figure 13] FIG. 10 is an exploded schematic view of a contact assembly in a relay provided by Example 2 of the present invention. [Figure 14] FIG. 10 shows a schematic diagram of a current when a contact assembly in a relay provided by Example 2 of the present invention makes contact. [Figure 15] FIG. 10 is a schematic diagram showing the relative positions of a contact assembly and an inner contact portion in a relay provided by Example 2 of the present invention. [Figure 16] 1 shows a schematic structure diagram of a relay provided by a second embodiment of the present invention. [Figure 17] 2 shows a schematic structural diagram 2 of a relay provided by embodiment 2 of the present invention. [Figure 18] FIG. 10 is a cross-sectional view of a relay provided according to a second embodiment of the present invention. [Figure 19] FIG. 10 is an exploded schematic view of a contact assembly in a relay provided by Example 3 of the present invention. [Figure 20] 2 shows a schematic structure diagram 2 of a relay provided by Example 3 of the present invention. [Figure 21]FIG. 10 shows a cross-sectional view of a relay provided by a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical solutions in the exemplary embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present invention. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, so it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of the present invention.

[0028] In describing this invention, unless otherwise specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" means two or more, and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "this / said" object or "a" object is also intended to mean one of a possible plurality of such objects.

[0029] Unless otherwise specified or described, the terms "connected," "fixed," etc. should be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection. "Connected" may be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0030] In addition, in the description of the present invention, terms indicating directions such as "up," "down," "in," and "out" used in the exemplary embodiments of the present invention are described in terms of angles shown in the drawings and should not be construed as limiting the exemplary embodiments of the present invention. Furthermore, when the context refers to an element or feature being connected "up," "down," "in," or "out" to another element, it may not only be directly connected "up," "down," "in," or "out" to the other element, but may also be indirectly connected "up," "down," "in," or "out" to the other element via an intermediate element.

[0031] Exemplary embodiments will now be described in more detail with reference to the accompanying drawings.

[0032] However, the exemplary embodiments may be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, the same reference numerals indicate the same or similar components, and detailed descriptions thereof will be omitted.

[0033] Example 1 This embodiment provides a relay, particularly a high-voltage DC relay. As shown in Figures 1 and 2, this relay includes a contact container 1 and a contact assembly 2. The contact assembly 2 includes a movable contact 22 and a pair of fixed contact lead-out ends 21. The fixed contact lead-out end 21 is installed on the contact container 1 and extends at least partially within the contact container 1, and the movable contact 22 is installed within the contact container 1 and is used to contact or separate from the pair of fixed contact lead-out ends 21.

[0034] In the relay of the embodiment of the present invention, the fixed contact pull-out end 21 is installed on the contact container 1 and extends at least partially within the contact container 1, and the contact container 1 provides a fixed position for the fixed contact pull-out end 21, and the contact container 1 also provides an insulating environment for at least a part of the movable contact 22 and the fixed contact pull-out end 21 of the contact assembly 2. The movable contact 22 is used to make contact with or separate from the pair of fixed contact pull-out ends 21, and when the movable contact 22 makes contact with the fixed contacts at the bottom of the pair of fixed contact pull-out ends 21, current flows in from one of the fixed contact pull-out ends 21, passes through the movable contact 22, and then flows out from the other fixed contact pull-out end 21, thereby connecting a load.

[0035] If the short-circuit load is large, the short-circuit current will cause an electromotive repulsive force to be generated between the movable contact 22 and the fixed contact lead-out end 21, causing the contact to pop off, generating an arc at the contact, which may cause severe combustion and even an explosion.

[0036] To solve this problem, as shown in Figure 3, an inner contact portion 20 is provided on at least one of the sides where the fixed contact pull-out end 21 and the movable contactor 22 provided by this embodiment are close to each other, and contact between the fixed contact pull-out end 21 and the movable contactor 22 is made only by the inner contact portion 20, and the inner contact portion 20 is installed on the sides where the pair of fixed contact pull-out ends 21 are close to each other.

[0037] In the relay provided by this embodiment, the fixed contact drawn-out ends 21 and the movable contactor 22 are in contact with each other at the inner contact portion 20, so a path for current to flow is formed between the fixed contact drawn-out ends 21 and the movable contactor 22. The inner contact portion 20 is installed on the sides of the pair of fixed contact drawn-out ends 21 that are close to each other, and the contact position between the fixed contact drawn-out ends 21 and the movable contactor 22 is set in the longitudinal direction of the movable contactor 22. L The center line of the movable contact 22 along C The contact position is brought close to the center line of the movable contact 22 according to the path of the current flow between the fixed contact lead end 21 and the movable contact 22. CBy placing the contacts as close as possible to the area and concentrating them inside the fixed contact lead-out end 21, the electromotive repulsive force is reduced, reducing the risk of arc burning caused by the fixed contact lead-out end 21 and the movable contact 22 repelling each other, thereby improving safety. At the same time, this relay can reduce the electromotive repulsive force without increasing the volume or size, and also meets the demand for weight reduction.

[0038] The inside specifically refers to the side where the pair of fixed contact drawn-out ends 21 approach each other (as shown in FIG. 1, Q is the direction where the pair of fixed contact drawn-out ends 21 approach each other), or the center line in the longitudinal direction of the movable contact 22. C (As shown in FIG. 1, L is the longitudinal direction of the movable contact 22, and T is the width direction of the movable contact 22). Therefore, the inner contact portion 20 is the side adjacent to the center line of the fixed contact lead-out end 21. M Alternatively, the inner contact portion 20 is arranged on the side facing inward, or ... M (As shown in FIG. 1, M is the center line of the fixed contact lead-out end 21).

[0039] The contact position between the fixed contact lead end 21 and the movable contact 22 is the center of the fixed contact lead end 21. line M If they are close to each other, the part of the fixed contact pull-out end 21 that extends beyond the movable contact 22 cannot form a circuit with the movable contact 22, so an electric repulsive force is generated only between the fixed contact pull-out end 21 and the corresponding part of the movable contact 22, and the angle between the direction of the current from the fixed contact pull-out end 21 toward the contact position and the horizontal plane is relatively gentle, the direction of the current is closer to parallel to the horizontal plane, the component of the current on the horizontal plane is relatively large, and the electric repulsive force between the fixed contact pull-out end 21 and the movable contact 22 is relatively large.

[0040] However, as shown in FIG. 4, the contact position between the fixed contact lead end 21 and the movable contact 22 provided by this embodiment is the center of the fixed contact lead end 21. line MWhen the fixed contact pull-out end 21 is far away from the movable contact 22 and is close to the adjacent sides of the pair of fixed contact pull-out ends 21, the direction of the current from the fixed contact pull-out end 21 to the inner contact portion 20 is steep, that is, the angle between the direction of the current from the fixed contact pull-out end 21 to the inner contact portion 20 and the horizontal plane is relatively large, so the component of the current on the horizontal plane is relatively small, and thereby the electromotive repulsive force between the fixed contact pull-out end 21 and the movable contact 22 is reduced.

[0041] In one embodiment, the edges of the inner contact portion 20 on the sides where the pair of fixed contact lead-out ends 21 are close to each other are flush with the edges of the fixed contact lead-out ends 21 .

[0042] This brings the contact position between the fixed contact pull-out end 21 and the movable contact 22 even closer to the side of the fixed contact pull-out end 21 where they are closest to each other, i.e., the inner contact portion 20 is positioned inside the fixed contact pull-out end 21, thereby achieving the purpose of reducing the electric repulsive force.

[0043] In one embodiment, as shown in Figures 5 to 7, the fixed contact pull-out end 21 has a groove 211 at the bottom of one end close to the movable contactor 22, and the inner contact portion 20 is a portion of the fixed contact pull-out end 21 where the groove 211 is not provided, and is located on the sides of the pair of fixed contact pull-out ends 21 that are close to each other.

[0044] The fixed contact pull-out end 21 has a groove 211 at the bottom of one end close to the movable contactor 22; in other words, the part of the bottom of the fixed contact pull-out end 21 where the groove 211 is not provided is a convex structure, and the inner contact portion 20 is arranged on the side of the pair of fixed contact pull-out ends 21 that are close to each other; not all of the convex structure is the inner contact portion 20; the part of the convex structure that is close to the side of the pair of fixed contact pull-out ends 21 that are close to each other is the inner contact portion 20.

[0045] In this way, the bottom of one end of the fixed contact lead-out end 21 adjacent to the movable contact 22 is L Center line of CThe fixed contact lead-out end 21 is in contact with the movable contact 22 at the edge in the direction closer to the center, and a groove 211 is provided in the fixed contact lead-out end 21, which can give position to a local region of the contact position of the movable contact 22. Since the fixed contact lead-out end 21 is fixed to the contact container 1, the position of the fixed contact lead-out end 21 is also relatively fixed, and the variation in the length dimension of the movable contact 22 does not exceed the center distance, and the movable contact 22 does not move in its longitudinal direction. L Even if there is a certain degree of misalignment, the fixed contact lead-out end 21 will yield a certain position to prevent the movable contact 22 from contacting the area of ​​the groove 211, so that the contact area between the fixed contact lead-out end 21 and the movable contact 22 can be accurately controlled and the contact areas are relatively fixed, ensuring the consistency of the relay. At the same time, the inner contact part 20, which is the contact position between the fixed contact lead-out end 21 and the movable contact 22, will be closer to the inner position, reducing the electric repulsive force between the movable contact and the fixed contact.

[0046] In one embodiment, as shown in Figures 8 to 10, the cross-sectional shape of the groove 211 is any one of a circle, an ellipse, an oval hole, and a polygon, or the groove 211 has a through groove structure provided at the fixed contact pull-out end 21 and extending along the width direction of the movable contactor 22.

[0047] For example, if the cross-sectional shape of the recessed groove 211 is circular, and the recessed groove 211 is a circular groove, the convex structure of the fixed contact drawn end 21 will be a circular ring structure, and the inner contact portion 20 will be the part close to the inside of the circular ring structure.

[0048] This embodiment does not limit the cross-sectional shape of the groove 211, and it can be deformed and expanded based on a circle to form an ellipse, an oblong hole, a polygon, etc., and it can be understood that the oblong hole can also be called a waist hole or a runway hole, etc. Here, the polygon can be, but is not limited to, a triangle, a rectangle, a pentagon, a hexagon, etc.

[0049] Of course, in some other embodiments, the partial structure may have the above-mentioned shape, specifically, other irregular shapes such as semicircular, semi-elliptical, semi-oval, semi-polygonal, etc., or a through-slot is provided directly at the lower end of the fixed contact lead-out end 21, and the through-slot extends along the width direction of the movable contact 22, and the extending direction of the through-slot is perpendicular to the center point connecting line of the bottom of the pair of fixed contact lead-out ends 21. In this embodiment, as long as the inner contact portion 20 is located inside the fixed contact lead-out end 21, the shape of the recessed groove 211 is not limited.

[0050] 4, the length of the movable contact 22 is shorter than the distance between the outer edges of the grooves 211 corresponding to the pair of fixed contact lead-out ends 21. In other words, the length of the movable contact 22 is shorter than the distance between the edges of the grooves 211 on the opposite sides of the pair of fixed contact lead-out ends 21.

[0051] If the length of the movable contactor 22 is equal to or greater than the distance between the outer edges of the grooves 211 corresponding to the pair of electrostatic contact pull-out ends 21, the contact position between them can cover the sides of the pair of electrostatic contact pull-out ends 21 that are far from each other, i.e., the outside of the fixed contact pull-out end 21, and the electromotive repulsive force between the fixed contact pull-out end 21 and the movable contactor 22 becomes relatively large. Therefore, making the length of the movable contactor 22 shorter than the distance between the outer edges of the grooves 211 corresponding to the pair of fixed contact pull-out ends 21 is equivalent to shortening the length of the movable contactor 22, and the contact position between the fixed contact pull-out end 21 and the movable contactor 22 can be moved closer to the sides of the fixed contact pull-out ends 21 that are close to each other, i.e., the inner contact portion 20 can be positioned inside the fixed contact pull-out end 21, or the inner contact portion 20 can be positioned in the longitudinal direction of the movable contactor 22. L Center line of C This can achieve the purpose of reducing the electric repulsive force.

[0052] In one embodiment, the projection of the inner contact portion 20 onto the movable contact 22 area is the projection of the bottom of the fixed contact lead-out end 21 onto the movable contact 22 area is smaller than.

[0053] The length of the movable contact 22 is reduced so that the length of the movable contact 22 is equal to the center line of the two fixed contact lead-out ends 21. M In this case, if the projection of the inner contact portion 20 onto the movable contact 22 is equal to the projection of the fixed contact lead end 21 onto the movable contact 22, the contact position between the fixed contact lead end 21 and the movable contact 22 may be the inner contact portion 20. However, the projection of the inner contact portion 20 onto the movable contact 22 provided by this embodiment is area is the projection of the bottom of the fixed contact lead-out end 21 onto the movable contact 22 area Since the length of the movable contactor 22 is smaller than the length of the fixed contact pull-out end 21, the inner contact portion 20 cannot be obtained simply by shortening the length of the movable contactor 22, and a groove 211 must be provided at the bottom of one end of the fixed contact pull-out end 21 that is close to the movable contactor 22. The inner part of the fixed contact pull-out end 21 that does not have the groove 211 forms the inner contact portion 20, which effectively reduces the contact area between the fixed contact pull-out end 21 and the movable contactor 22 and allows the contact area between the fixed contact pull-out end 21 and the movable contactor 22 to be moved closer to the inside.

[0054] In one embodiment, as shown in FIG. 7, the movable contact 22 is L Along this, at least one side of the inner contact portion 20 has an arc-shaped structure.

[0055] When the shape of the groove 211 is a through groove, a rectangle, a hexagon, etc., the inner edge of the inner contact portion 20 is aligned with the inner edge of the fixed contact pull-out end 21, that is, the inside of the inner contact portion 20 has an arc structure, and one side of the inner contact portion 20 has an arc structure.

[0056] When the groove 211 is a circle, an ellipse, an oblong hole, etc., the inner edge of the inner contact portion 20 is aligned with the inner edge of the fixed contact lead-out end 21, the outer edge of the inner contact portion 20 is aligned with the groove wall edge of the groove 211, and both the inner and outer edges of the inner contact portion 20 have an arc structure, and both sides of the inner contact portion 20 have an arc structure.

[0057] In one embodiment, the bottom of the fixed contact lead end 21 relative to the movable contact 22 The end face of the movable contact 22The projected area is equal to or less than the projected area of ​​the center of the fixed contact drawn end 21 relative to the movable contact 22.

[0058] In other words, the inner contact portion 20 is within the projection range of the central part of the fixed contact pull-out end 21 onto the movable contactor 22, and the projection range of the inner contact portion 20 onto the movable contactor 22 is within the projection range of the central part of the fixed contact pull-out end 21 onto the movable contactor 22, so that the direction of the current from the fixed contact pull-out end 21 to the inner contact portion 20 can be made steeper, thereby reducing the electric repulsive force.

[0059] In one embodiment, as shown in FIG. 7, the movable contactor 22 includes a thrust portion 221 and two extension portions 222, the thrust portion 221 being provided between a pair of fixed contact lead-out ends 21, and the two extension portions being provided on both sides of the thrust portion 221 and correspondingly contacting the pair of fixed contact lead-out ends 21.

[0060] After a thrust force is applied to the thrust portion 221, the thrust portion 221 moves the extension portions 222 in a direction approaching the fixed contact lead-out ends 21, and the two extension portions 222 contact the pair of fixed contact lead-out ends 21. Connected to The thrust portion 221 serves to provide thrust, and the extension portion 222 provides a mutual contact area between the movable contact 22 and the fixed contact pull-out end 21, so that the corresponding extension portion 222 is abutted against both of the two spaced apart fixed contact pull-out ends 21.

[0061] In one embodiment, both sides of the thrust portion 221 along the axial direction of the electrostatic contact lead-out end 21 have a flat structure.

[0062] In this way, the lower surface of thrust portion 221 has a flat structure, which increases the area that receives force and ensures the stability of the received force. The upper surface of thrust portion 221 has a flat structure, which provides a mounting position for other components.

[0063] In one embodiment, as shown in FIG. 7, the projection of the inner contact portion 20 onto the reference plane area is the projection of the extension 222 onto the reference plane areaand the reference plane is the plane on which the upper surface of the thrust portion 221 is located.

[0064] The extension 222 is formed by projecting the inner contact portion 20 onto a reference plane to provide a mutual contact area between the movable contact 22 and the fixed contact lead-out end 21. area is the projection of the extension 222 onto the reference plane. area , the entire extension 222 becomes the contact area between the movable contact 22 and the fixed contact lead-out end 21, so the contact area becomes relatively large. area , the projection of the extension 222 onto the reference plane. area Since the inner contact portion 20 is the actual contact area between the movable contact 22 and the fixed contact lead-out end 21, the contact area is closer to the inside, thereby achieving the purpose of reducing the electromechanical repulsive force.

[0065] In one embodiment, as shown in FIG. 7, the extension portion 222 has a tapered structure, and the small end of the extension portion 222 is positioned away from the thrust portion 221 so that the inner contact portion 20 approaches the sides of the pair of fixed contact pull-out ends 21 that are closer to each other.

[0066] By making the extension portion 222 have a tapered structure, both ends of the movable contact 22 have an acute angle structure, and the small end of the extension portion 222 is arranged so as to be away from the thrust portion 221. Compared to a rectangular structure, this is equivalent to cutting off the four corners of the vertices based on a rectangular plate to make both ends have an acute angle structure, and the acute angle structure at both ends plays a role of avoidance, reducing the contact area between the movable contact 22 and the fixed contact lead end 21, and the inner contact portion 20 is also somewhat close to the sides of the pair of fixed contact lead ends 21 that are close to each other, and the inner contact portion 20 is arranged in the longitudinal direction of the movable contact 22. L Center line of C This allows the object of reducing the electric repulsive force to be achieved.

[0067] It is understood that the angle between the two sides of the inner contact portion 20 along the width of the movable contact 22 may be an acute angle, a right angle, or an obtuse angle.

[0068] In one embodiment, the contact container 1 includes an insulating cover 11, and the insulating cover 11 and the yoke plate are connected via a flange member 12, and the insulating cover 11 and the yoke plate form a contact chamber, which provides an insulating environment for contact between the movable contact 22 and the fixed contact lead-out end 21.

[0069] 1 and 11-12, the relay also includes a push assembly 4 including a push rod 411, a base 413, a fixed piece, an elastic member 43, and a U-shaped bracket 42. The base 413, the fixed piece, and the upper part of the push rod 411 can be integrally injection molded to form a push rod unit 41, the bottom of the U-shaped bracket 42 is fixedly connected to the fixed piece, the U-shaped bracket 42 and the base 413 form a frame structure, and the movable contact 22 and the elastic member 43 are attached to the frame structure formed by the U-shaped bracket 42 and the base 413, one end of the elastic member 43 contacts the base 413 and the other end contacts the movable contact 22, and the elastic member 43 can provide an elastic force that causes the movable contact 22 to move away from the base 413 and approach the fixed contact lead end 21.

[0070] The working process of the relay provided by this embodiment is as follows:

[0071] bullets Since one end of the elastic member 43 contacts the base 413 and the other end contacts the movable contactor 22, the elastic member 43 can provide elastic force when the push rod unit 41 is pressed, and the movable contactor 22 tends to move away from the base 413 and approach the fixed contact pull-out end 21, and when the push rod unit 41 is moved to an appropriate position, the movable contacts at both ends of the movable contactor 22 contact the two fixed contact pull-out ends 21 respectively.

[0072] Example 2 This embodiment is similar to the first embodiment except for the specific structure of the movable contact 22.

[0073] As shown in Figures 13 to 15, the extension portion 222 provided in this embodiment has an arc-shaped structure on at least one side facing the fixed contact pull-out end 21, and the inner contact portion 20 is adjacent to the side where the pair of fixed contact pull-out ends 21 are close to each other.

[0074] When only the side of the extension 222 facing the fixed contact pull-out end 21 has a cylindrical structure, the upper end of the extension 222 has a semi-cylindrical structure and the lower end of the extension 222 has a flat surface. When both the side of the extension 222 facing toward the fixed contact pull-out end 21 and the side facing away from the fixed contact pull-out end 21 have semi-cylindrical structures, the entire extension 222 has a rod-like or cylindrical structure, and the cross section of the extension 222 may be a polygonal rod-like structure such as a triangle, pentagon, or hexagon.

[0075] When the movable contactor 22 has a rod-shaped structure, it can be produced by heading or turning a rod or wire material, and compared to conventional movable contactors obtained by pressing a plate material, it is possible to process the movable contactor 22 without waste material and to significantly reduce the amount of waste material generated, thereby significantly reducing the material cost of the movable contactor 22. The arc-shaped surface of the round bar achieves approximately linear small-area contact between the two fixed contact lead ends 21 and the movable contactor 22 in a contact state, reducing the contact resistance between the fixed contact lead ends 21 and the movable contactor 22 and the electromechanical repulsive force between the contacts, improving the contact reliability of the contacts. Furthermore, because the cross section of the extension 222 of the movable contact 22 is circular, when the contacts are separated and the arc is drawn out, the magnetic blow-off field allows the arc to quickly move outward along the arc surface of the round bar and the rounded chamfer of the fixed contact draw-out end 21. As the contact gap increases rapidly, this favors the root of the arc moving outward, shortening the time the arc continues to ablate at the contact position, reducing contact wear and improving the life of the relay.

[0076] Since the extension 222 has an arc-shaped structure at least on one side facing the fixed contact lead-out end 21, the inner contact portion 20 corresponds to the uppermost position region of the extension 222. When the shape of the recessed groove 211 is a circular structure, the inner contact portion 20 is located in the width direction of the movable contact 22 with the entire protruding structure as the reference.T The contact area is then further inward, thereby achieving the purpose of reducing the electric repulsive force between the two.

[0077] As a result, the longitudinal direction of the movable contact 22 of the inner contact portion 20 L The both sides of the inner contact portion 20 are flush with the groove wall of the recessed groove 211 and the inner edge of the fixed contact lead-out end 21. T The two sides of the fixed contact lead end 21 and the movable contact 22 are arranged in parallel, and the contact area is not only relatively small but also relatively neat, improving the contact reliability between the fixed contact lead end 21 and the movable contact 22.

[0078] In some other embodiments, the overall cross section of the extension 222 of the movable contact 22 is polygonal, specifically triangular, with one vertex of the triangle pointing upward and cooperating with the lower end of the fixed contact pull-out end 21. As a result, even in the contact state, the fixed contact pull-out end 21 and the movable contact 22 still make contact over a small area resembling a line. At the same time, due to the action of the magnetic blowing field, the arc generated between the fixed contact pull-out end 21 and the movable contact 22 can quickly move outward along the corresponding inclination of the extension 222 and the rounded chamfer of the fixed contact pull-out end 21.

[0079] As shown in FIGS. 16 to 18 , the relay also includes an electromagnet unit 44. The electromagnet unit 44 is disposed on the side of the yoke plate away from the insulating cover 11 and surrounds the metal cover. The push rod unit 41 is drivingly connected to the electromagnet unit 44, and the push rod unit 41 is movably disposed within a drive chamber surrounded by the metal cover and the yoke plate, and is connected to the movable contact 22 via a through-hole in the yoke plate. When the electromagnet unit 44 is energized, it can drive and move the push rod unit 41, and further move the movable contact 22 so that it contacts or separates from the fixed contact lead-out end 21.

[0080] 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 hollow and cylindrical and made of an insulating material. A metal cover is fitted to the coil bobbin 441, the coil 442 surrounds the coil bobbin 441, and the fixed iron core 444 is fixedly installed within the metal cover, with a portion of the fixed iron core 444 extending into the through hole 2211. The fixed iron core 444 is provided with a first through hole disposed corresponding to the position of the through hole 2211, and the push rod unit 41 passes through the first through hole. The movable iron core 443 is movably disposed within the metal cover and is provided opposite the fixed iron core 444. The movable iron core 443 is connected to the push rod unit 41, and is attracted to the fixed iron core 444 when the coil 442 is energized. The armature 443 and the push rod unit 41 can be connected by screwing, riveting, welding, or other methods.

[0081] The relay also includes an arc-extinguishing unit 5 disposed within the hollow cavity of the housing and used to extinguish the arc of the contact assembly 2. The arc-extinguishing unit 5 includes two arc-extinguishing magnets 51. The arc-extinguishing magnets 51 may be permanent magnets, and each arc-extinguishing magnet 51 may have a substantially rectangular parallelepiped shape. The two arc-extinguishing magnets 51 are disposed on either side of the insulating cover 11, respectively, and are spaced apart from each other along the longitudinal direction of the movable contact 22. L are arranged opposite each other along the line.

[0082] In this embodiment, two arc-extinguishing magnets 51 are located on both the left and right sides of the insulating cover 11. The polarities of the opposing surfaces of the two arc-extinguishing magnets 51 are opposite. That is, the left surface of the arc-extinguishing magnet 51 located on the left side of the insulating cover 11 is an S pole and the right surface is an N pole, and the left surface of the arc-extinguishing magnet 51 located on the right side of the insulating cover 11 is an S pole and the right surface is an N pole.

[0083] Of course, it is also possible to make the polarities of the opposing surfaces of the two arc-extinguishing magnets 51 the same; for example, the left surface of the arc-extinguishing magnet 51 located on the left side of the insulating cover 11 is an S pole and the right surface is an N pole, and the left surface of the arc-extinguishing magnet 51 located on the right side of the insulating cover 11 is an N pole and the right surface is an S pole.

[0084] In this way, by arranging the two arc-extinguishing magnets 51 facing each other, a magnetic field can be formed around the contact assembly 2.

[0085] Therefore, the arc generated between the fixed contact drawn end 21 and the movable contact 22 is stretched away from each other by the action of the magnetic field, thereby realizing extinguishing the arc.

[0086] The arc-extinguishing unit 5 also includes two yoke clamps 52 positioned corresponding to the positions of the two arc-extinguishing magnets 51. The two yoke clamps 52 surround the insulating cover 11 and the two arc-extinguishing magnets 51. The design of the yoke clamps 52 surrounding the arc-extinguishing magnets 51 prevents the magnetic field generated by the arc-extinguishing magnets 51 from spreading outward and affecting the arc-extinguishing effect. The yoke clamps 52 are made of a soft magnetic material. Examples of soft magnetic materials include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0087] The working process of the relay provided by this embodiment is as follows:

[0088] When the coil 442 is energized, the fixed core 444 attracts the movable core 443, which drives the push rod unit 41 to move upward. The spring between the fixed core 444 and the movable core 443 is compressed, and the push rod unit 41 moves the movable contact 22 through the U-shaped bracket 42 and the elastic member 43, causing both ends of the movable contact 22 to contact the two fixed contact lead-out ends 21 respectively, completing the process of closing the movable contact and the fixed contact.

[0089] When the current to the coil 442 is interrupted, the fixed core 444 releases the attraction of the movable core 443, and the elastic force of the compressed spring causes the movable core 443 to move the push rod unit 41 downward, separating the movable contacts at both ends of the movable contactor 22 from the two fixed contact lead-out ends 21, thereby completing the process of separating the movable contacts and the fixed contacts.

[0090] Example 3 This embodiment is similar to the first embodiment except for the specific structure of the movable contact 22 and the further improvement of the short-circuit resistance function.

[0091] If the short-circuit load is large, the short-circuit current will cause an electro-repulsive force to be generated between the movable contact 22 and the fixed contact lead-out end 21, causing the contact to pop off, and an arc will occur at the contact, causing violent combustion and possibly an explosion.

[0092] To solve this problem, as shown in Figures 19 to 21, the relay provided by this embodiment further includes a short-circuit resistant assembly 3 used to resist the electromotive repulsive force between the movable contact 22 and the fixed contact lead-out end 21, and the short-circuit resistant assembly 3 is installed on the side of the thrust portion 221 of the movable contact 22 that is closer to the fixed contact lead-out end 21. Since both sides of the thrust portion 221 have a flat structure, the flat surfaces on both sides of the thrust portion 221 provide the short-circuit resistant assembly 3 with ease of installation and reliability.

[0093] 19 and 21, the short-circuit-resistant assembly 3 includes an upper magnetic conductive body 31 provided on the side of the thrust portion 221 closer to the fixed contact lead-out end 21, and a lower magnetic conductive body 32 provided on the side of the thrust portion 221 farther from the fixed contact lead-out end 21, and a magnetic circuit is formed between the upper magnetic conductive body 31 and the lower magnetic conductive body 32, which generates an attractive force when a fault occurs in the movable contact 22 and a large current flows, and is used to resist the electromotive repulsive force between the movable contact 22 and the fixed contact lead-out end 21. The upper magnetic conductive body 31 and the lower magnetic conductive body 32 can be made of materials such as iron, cobalt, nickel, and alloys thereof.

[0094] The lower magnetic conductive body 32 is fixed below the thrust portion 221 of the movable contact 22 and can move together with the movable contact 22 in a direction approaching the fixed contact lead-out end 21, and a magnetic circuit can be formed between the upper magnetic conductive body 31 and the lower magnetic conductive body 32. When a fault occurs in the movable contact 22 and a large current flows, the upper magnetic conductive body 31 is located above the movable contact 22 and the lower magnetic conductive body 32 is located below the movable contact 22, so that the movable contact 22 moves in a direction When the upper magnetic conductive body 31 generates an attractive force to the lower magnetic conductive body 32, this attractive force serves to attract and pull the movable contact 22, and is used to resist the electromotive repulsive force caused by the fault current between the movable contact 22 and the fixed contact lead-out end 21, thereby avoiding the mutual separation between the movable contact 22 and the fixed contact lead-out end 21 and causing a pulling arc to explode, and ensuring the reliability and safety of the contact between the movable contact 22 and the fixed contact lead-out end 21.

[0095] In some other embodiments, the upper magnetic conductive body 31 may have a linear structure, and the upper magnetic conductive body 31 is disposed corresponding to the position between the two movable contacts of the movable contactor 22, and the width direction of the movable contactor 22 T and is used for matching and corresponding the upper magnetic conductive body 31 and the lower magnetic conductive body 32. The lower magnetic conductive body 32 has a U-shaped structure, and the opening of the lower magnetic conductive body 32 is provided toward the movable contact 22, and by extending the two side arms of the lower magnetic conductive body 32 toward the upper magnetic conductive body 31, the two side arms of the lower magnetic conductive body 32 can be close to or in contact with both ends of the upper magnetic conductive body 31, respectively, and a magnetic conductive ring can be formed on the movable contact 22 and running along its width. L Since both ends of the movable contact are movable contacts, the width direction of the movable contactor 22 T When a fault occurs in the movable contact 22 and a large current flows, an electromagnetic attraction force is generated in the direction of the pressure of the movable contact to resist the electromotive repulsive force caused by the fault current between the movable contact 22 and the fixed contact lead-out end 21.

[0096] In one embodiment, as shown in FIGS. 19 to 21, a through hole 2211 is provided in the thrust portion 221, and at least a part of the lower magnetic conductive body 32 is bored in the through hole 2211.

[0097] In this way, the thrust portion 221 of the movable contact 22 provides an attachment and fixing position for the lower magnetic body 32, so as to enhance the fixing effect between the movable contact 22 and the lower magnetic body 32. Since the lower magnetic body 32 resembles a U-shaped structure, the opening of the lower magnetic body 32 is arranged toward the thrust portion 221 of the movable contact 22, one side arm of the lower magnetic body 32 is wrapped around the long side of the movable contact 22, and the other side arm is drilled into the through-hole 2211.

[0098] In one embodiment, the number of upper magnetic bodies 31 and lower magnetic bodies 32 is multiple, and the multiple upper magnetic bodies 31 and the multiple lower magnetic bodies 32 are arranged correspondingly, and the sides of two adjacent lower magnetic bodies 32 that are close to each other are drilled into the through hole 2211.

[0099] By arranging a plurality of upper magnetic bodies 31 and a plurality of lower magnetic bodies 32 in a corresponding manner, the magnetic attraction effect between the upper magnetic bodies 31 and the lower magnetic bodies 32 is increased, and the effect of attracting and pulling the movable contact 22 is further improved so as to resist the electromotive repulsive force generated by the fault current between the movable contact 22 and the fixed contact pull-out end 21.

[0100] For example, the number of upper magnetic bodies 31 and lower magnetic bodies 32 is two, and the adjacent side walls of the two lower magnetic bodies 32 are simultaneously drilled into the through hole 2211, and the same through hole 2211 is used to install the two lower magnetic bodies 32, thereby reducing manufacturing costs and assembly difficulties.

[0101] 19 to 21, in one embodiment, the U-shaped bracket 42 is fixedly connected to the upper magnetic conductive body 31, the lower magnetic conductive body 32 is connected to the bottom of the movable contact 22, the movable contact 22 and the lower magnetic conductive body 32 form a movable member, and the short-circuit-proof assembly 3 and the movable contact 22 are installed between the U-shaped bracket 42 and the push rod unit 41. The push rod unit 41 and the U-shaped bracket 42 engage with each other via a limit protrusion 412 and a limit hole 421, and the moving force of the push rod unit 41 is transmitted to the U-shaped bracket 42, driving the movable contact 22 to move, so that the movable contact 22 can contact or separate from a pair of fixed contact lead-out ends.

[0102] Example 4 The principle of this embodiment is the same as that of the first embodiment, and the only difference is the position of the inner contact portion 20.

[0103] The inner contact portion 20 provided by this embodiment is a boss protruding from the side of the movable contactor 22 closer to the fixed contact pull-out end 21, and at least a portion of the boss is located on the sides of the pair of fixed contact pull-out ends 21 that are close to each other.

[0104] When the side of the movable contact 22 closer to the fixed contact pull-out end is flat, the contact area between them is relatively large, but by providing a protruding boss on the side of the movable contact 22 closer to the fixed contact pull-out end 21 to form the inner contact portion 20, the contact area between them is reduced and the contact surface area is reduced. At least a portion of the boss is located on the sides of the pair of fixed contact pull-out ends 21 that are close to each other, and the contact positions of the two are concentrated inside the fixed contact pull-out ends 21 as close as possible to the constricted current area in the center of the movable contact, thereby reducing the size of the constricted area, which reduces the electromotive repulsive force and the risk of arc burning caused by the fixed contact pull-out end 21 and the movable contact 22 repelling each other, improving safety.

[0105] In one embodiment, the cross-sectional shape of the boss is either a partial ring structure or a partial strip structure.

[0106] It is understood that the annular structure includes, but is not limited to, a circular ring, an elliptical ring, an oval ring, and a polygonal ring, and the polygonal ring includes, but is not limited to, a triangular ring, a rectangular ring, a pentagonal ring, a hexagonal ring, etc. At least a portion of the boss is located on the sides of the pair of fixed contact lead-out ends 21 that are close to each other, and therefore, the inner portion of a complete circular structure is cut out as the inner contact portion 20.

[0107] It is understood that the movable contact 22 provided by the embodiment of the present invention may have the shape of the movable contact 22 in the first or second embodiment, or another shape.

[0108] In another embodiment, a recessed groove 211 is provided at one end of the fixed contact pull-out end 21 close to the movable contactor 22, and a boss is protruded from the side of the movable contactor 22 close to the fixed contact pull-out end 21, and the fixed contact pull-out end 21 and the movable contactor 22 each correspond to two inner contact portions 20, and the two inner contact portions 20 are in contact with each other at their near sides, and the fixed contact pull-out end 21 and the movable contactor 22 are in contact with each other via the two inner contact portions 20.

[0109] It should be noted that the relays shown in the drawings and described herein are merely examples of the use of the principles of the present invention, and those skilled in the art should clearly understand that the principles of the present invention are not limited to the details or components of the devices shown in the drawings or described in the specification.

[0110] It should be understood that the present invention is not limited in application to the detailed construction and arrangement of components proposed herein. The present invention may have other embodiments and be realized and carried out in various ways. Such variations and modifications are within the scope of the present invention. The present invention as disclosed and limited herein should be understood to extend to all alternative combinations of two or more distinct features described or apparent in the specification and / or drawings. All these different combinations constitute multiple alternative aspects of the invention. The embodiments described herein represent the best mode known for carrying out the invention and will enable those skilled in the art to utilize the invention.

[0111] Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein.

[0112] The present invention is intended to cover any variations, uses, or modifications of the invention in accordance with its general principles, including means common knowledge or customary in the art that are not disclosed in the present invention.

[0113] It is intended that the specification and example embodiments be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

[0114] It will be understood that the invention is not limited to the exact construction described above and illustrated in the accompanying drawings, and that various modifications and changes can be made without departing from the scope of the invention.

[0115] The scope of protection of the present invention is limited only by the appended claims. [Explanation of symbols]

[0116] 1. Contact container; 2. Contact assembly; 3. Short-circuit proof assembly; 4. Push assembly; 5. Arc extinguishing unit; 11. Insulating cover; 12. Flange member; 20.Inner contact part; 21.Fixed contact pull-out end; 211.Concave groove; 22. Movable contact; 221. Thrust part; 2211. Through hole; 222. Extension part; 31. Upper magnetic conductor; 32. Lower magnetic conductor; 41. Push rod unit; 411. Push rod; 412. Limit protrusion; 413. Base; 42.U-shaped bracket; 421.Limit hole; 43. Elastic members; 44. Electromagnet unit; 441. Coil bobbin; 442. Coil; 443. Movable core; 444. Fixed core; 51. Arc-extinguishing magnet; 52. Yoke clamp;

Claims

1. 1. A relay including a contact assembly, The contact assembly includes a movable contact and a pair of fixed contact lead ends, the movable contact being used to contact or separate from the pair of fixed contact lead ends; an inner contact portion is provided on at least one of the sides where the fixed contact lead-out end and the movable contactor are close to each other, and the fixed contact lead-out end and the movable contactor are in contact only by the inner contact portion, and the inner contact portion is provided on the sides where the pair of fixed contact lead-out ends are close to each other; the fixed contact drawn-out end has a recessed groove formed in a bottom portion of one end thereof close to the movable contactor, and the inner contact portion is a portion of the fixed contact drawn-out end where the recessed groove is not formed, and is located on the sides of the pair of fixed contact drawn-out ends that are close to each other; The projected area of ​​the inner contact portion relative to the movable contactor is smaller than the projected area of ​​the bottom of the fixed contact lead-out end relative to the movable contactor. A relay characterized by:

2. The inner contact portion is provided between the center lines of the pair of fixed contact lead-out ends.

2. The relay according to claim 1.

3. The cross-sectional shape of the groove is one of a circle, an ellipse, an oblong hole, and a polygon; or The recessed groove is provided at the fixed contact lead-out end and has a through-groove structure along the width direction of the movable contact.

2. The relay according to claim 1.

4. The length of the movable contact is less than the distance between the outer edges of the grooves corresponding to the pair of fixed contact lead-out ends.

2. The relay according to claim 1.

5. The inner contact portion is a boss provided in a protruding manner on a side of the movable contactor near the fixed contact lead-out end, and at least a part of the boss is located on the side of the pair of fixed contact lead-out ends that are close to each other.

2. The relay according to claim 1.

6. The projected area of ​​the end face of the bottom of the fixed contact lead-out end facing the movable contact is equal to or less than the projected area of ​​the center of the fixed contact lead-out end facing the movable contact.

4. The relay according to claim 1, wherein the relay is a conductor.

7. The movable contactor includes a thrust portion and two extension portions, the thrust portion is provided between projections of the pair of fixed contact lead-out ends onto the movable contact, the two extension portions are provided on both sides of the thrust portion and are in contact with the pair of fixed contact lead-out ends, The projected area of ​​the inner contact portion relative to a reference surface is smaller than the projected area of ​​the extension portion relative to the reference surface, and the reference surface is a surface on which the upper surface of the thrust portion is located.

4. The relay according to claim 1, wherein the relay is a conductor.

8. the extension has a tapered structure; The small end of the extension portion is disposed away from the thrust portion so that the inner contact portion approaches the sides of the pair of fixed contact lead-out ends that are closer to each other.

8. The relay according to claim 7.

9. The extension portion has an arc-shaped structure at least on the side facing the fixed contact lead-out ends, and the inner contact portion is adjacent to the sides of the pair of fixed contact lead-out ends that are adjacent to each other.

8. The relay according to claim 7.

10. Both sides of the inner contact portion along the width direction of the movable contactor are arranged parallel to each other.

10. The relay according to claim 9.

11. The thrust portion has flat surfaces on both the upper and lower sides along the axial direction of the fixed contact lead-out end.

8. The relay according to claim 7.

12. The device further includes a short-circuit-proof assembly provided at least on a side of the thrust portion close to the fixed contact lead-out end.

8. The relay according to claim 7.

13. The short-circuit tolerant assembly includes: an upper magnetic conductive body provided on a side of the thrust portion close to the fixed contact lead-out end; a lower magnetic conductive body provided on a side of the thrust portion farther from the fixed contact lead-out end, A magnetic circuit is formed between the upper and lower magnetic bodies, and when a large fault current flows through the movable contact, an attractive force is generated to resist the electromotive repulsive force between the movable contact and the fixed contact lead end.

13. The relay according to claim 12.

14. The thrust portion has a through hole, and at least a portion of the lower magnetic conductive body is drilled through the through hole.

14. The relay of claim 13.

15. the number of the upper magnetic conductive bodies and the lower magnetic conductive bodies is plural, and the upper magnetic conductive bodies and the lower magnetic conductive bodies are provided correspondingly; The adjacent sides of the two adjacent lower magnetic conductive bodies are drilled through the through holes.

15. The relay of claim 14.

Images