High-voltage direct-current relay

Abstract

The present application relates to a high-voltage direct-current relay (10), comprising a static contact (14) and a moving assembly (13); the moving assembly (13) comprises a pushing mechanism (133), a moving spring mechanism (131), an elastic element (132), and a support (135); the moving spring mechanism (131) works in elastic cooperation with the pushing mechanism (133) by means of the elastic element (132); the support (135) is connected to the pushing mechanism (133). The moving spring mechanism (131) is provided with a sliding structure (1315); the support (135) is provided with a sliding groove (1356); a support surface (1362) is formed on a side wall of the sliding groove (1356); the support surface (1362) is used for, when a short-circuit current causes the moving contact point (1313) and the static contact (14) to spring apart, abutting against the sliding structure (1315) at a position on a path along which the moving spring mechanism (131) moves away from the static contact (14).

Description

High-voltage direct-current relay

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 2024108319057, filed on June 25, 2024, entitled “High-voltage direct-current relay”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of relays, and in particular to a high-voltage direct-current relay. BACKGROUND

[0004] As a new type of electric automatic switch, the high-voltage direct-current relay can realize the normally open state or the normally closed state through the electromagnetic holding force. The current high-voltage direct-current relay generally includes an electromagnetic assembly, a moving assembly, and a static contact. The moving contact provided on the moving spring sheet of the moving assembly and the static contact provided on the static contact together serve as the contact part of the high-voltage direct-current relay. The electromagnetic assembly includes a coil, a first core, and a second core. When the coil is energized, the second core can be magnetized, so that the second core and the first core are attracted to each other, thereby driving the moving assembly to approach the static contact until the moving contact on the moving assembly and the static contact on the static contact are in contact, realizing the conduction of the circuit. However, in the current high-voltage direct-current relay, when a short circuit or overload occurs in the circuit, an electric repulsive force will be generated between the moving contact and the static contact, causing the moving contact and the static contact to pop open, and an arc phenomenon will occur between the moving contact and the static contact, resulting in damage to the relay. In the new energy industry and other industries that use high-voltage circuits, there is an increasing demand for miniaturization and short-circuit resistance of high-voltage direct-current relays. SUMMARY

[0005] According to various embodiments of the present application, a high-voltage direct-current relay is provided.

[0006] A high-voltage direct-current relay includes:

[0007] an insulating cover;

[0008] a static contact provided with a static contact, the static contact being fixed relative to the insulating cover, and a side of the static contact facing away from the static contact protruding outside the insulating cover; and

[0009] a moving assembly including a pushing mechanism, a moving spring mechanism, an elastic element, and a bracket, the moving spring mechanism being provided with a moving contact opposite the static contact, the moving spring mechanism being elastically connected to the pushing mechanism through the elastic element, and the bracket being connected to the pushing mechanism;

[0010] The moving spring mechanism is provided with a sliding structure, the support is provided with a sliding groove in sliding cooperation with the sliding structure, a side wall of the sliding groove is formed with a supporting surface located at a side of the sliding structure facing the pushing mechanism, the supporting surface is spaced from the sliding structure, and the supporting surface is used for abutting against the sliding structure at one of positions on a path of the moving spring mechanism moving away from the static contact when the short-circuit current occurs to cause the moving contact and the static contact to be separated.

[0011] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the disclosed drawings.

[0013] Fig. 1 is a structural schematic diagram of a high-voltage direct-current relay in an initial state according to some embodiments.

[0014] Fig. 2 is a structural schematic diagram of a moving assembly in the high-voltage direct-current relay shown in Fig. 1.

[0015] Fig. 3 is an exploded schematic diagram of the moving assembly shown in Fig. 2.

[0016] Fig. 4 is a structural schematic diagram of the high-voltage direct-current relay shown in Fig. 1 in a first state.

[0017] Fig. 5 is a structural schematic diagram of the high-voltage direct-current relay shown in Fig. 1 in a second state.

[0018] Fig. 6 is a structural schematic diagram of the high-voltage direct-current relay shown in Fig. 1 in a third state.

[0019] Fig. 7 is a structural schematic diagram of the electromagnetic assembly shown in Fig. 2 from another angle.

[0020] Fig. 8 is a structural schematic diagram of some elements of the high-voltage direct-current relay shown in Fig. 1.

[0021] Fig. 9 is an exploded schematic diagram of the some elements of the high-voltage direct-current relay shown in Fig. 8. DETAILED DESCRIPTION

[0022] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0023] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0025] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0028] With the increasingly wide application of high-voltage DC relays in various devices, the industry has increasingly high requirements for the heat loss resistance, short-circuit resistance circuit, and voltage of high-voltage DC relays. Among them, the current and voltage of the circuit to which the high-voltage DC relay is applied are increasingly high. For example, in new energy vehicles and other devices, as the endurance mileage requirements of new energy vehicles increase, the capacity of the battery pack of the new energy vehicle also increases, and the current and voltage of the high-voltage DC relay applied to the battery pack circuit also increase. As a result, when the circuit is short-circuited or overloaded, the electrodynamic repulsion generated by the moving contact and the stationary contact of the high-voltage DC relay is large, which easily causes the moving contact and the stationary contact to be bounced apart by a large distance. For example, the elastic element is squeezed to an extreme compression state by the moving spring mechanism, and then the impact force is transmitted to the push seat and the electromagnetic assembly. At this time, the impact force is too large, which easily causes the electromagnetic assembly, the moving assembly, and the stationary contact to be completely separated, resulting in damage to the high-voltage DC relay, or the distance between the moving contact and the stationary contact is too far, resulting in too much heat generated by the arc phenomenon between the moving contact and the stationary contact, which burns the high-voltage DC relay, or even causes the high-voltage DC relay to explode. However, in order to increase the holding force of the electromagnetic assembly on the moving assembly to avoid the electromagnetic assembly from being separated from the stationary contact due to insufficient holding force or to reduce the bounce distance of the moving contact and the stationary contact, the traditional high-voltage DC relay usually needs to increase the number of turns of the coil, which increases the cost and volume of the electromagnetic assembly, and increases the volume and cost of the high-voltage DC relay.

[0029] Based on the above problems, the present application provides a high-voltage DC relay.

[0030] Please refer to FIG. 1, FIG. 2 and FIG. 3, FIG. 1 is a schematic structural diagram of a high-voltage direct-current relay 10 in some embodiments, FIG. 2 is a schematic structural diagram of a moving assembly 13 in some embodiments, and FIG. 3 is an exploded schematic diagram of the moving assembly 13 in some other embodiments. In some embodiments, the high-voltage direct-current relay 10 comprises a base 11, an electromagnetic assembly 12, the moving assembly 13, a static contact 14 and an insulating cover 142, the insulating cover 142 is arranged on the base 11, the static contact 14 is arranged on the insulating cover 142, and the static contact 14 can be provided with two, the static contact 14 is provided with two static contact points 141. The moving assembly 13 comprises a moving spring mechanism 131, an elastic element 132 and a pushing mechanism 133, the moving spring mechanism 131 is provided with two moving contact points 1313 opposite to the two static contact points 141, and the moving spring mechanism 131 is elastically connected with the pushing mechanism 133 through the elastic element 132. The electromagnetic assembly 12 is arranged on the base 11 and can drive the moving assembly 13 as a whole to move towards or away from the static contact points 141 through the pushing mechanism 133, so that the moving contact points 1313 are in contact with the static contact points 141 or the moving contact points 1313 are separated from the static contact points 141. It can be understood that the high-voltage direct-current relay 10 can be applied to a circuit as a switching element, the static contact 14 can be provided with an outgoing end electrically connected to the two static contact points 141, and the outgoing end is electrically connected with the circuit. When the moving contact points 1313 and the static contact points 141 are in contact, the moving contact points 1313 conduct the two static contact points 141 to make the circuit conductive, at this time the high-voltage direct-current relay 10 is opened, and when the moving contact points 1313 are separated from the static contact points 141, the two static contact points 141 are electrically isolated, the circuit is disconnected, and at this time the high-voltage direct-current relay 10 is closed. In some embodiments, the high-voltage direct-current relay 10 can further comprise a shell (not shown in the figure) arranged on the insulating cover 142 and the static contact 14, the static contact 14 can be led out to the outside of the shell through a conductive structure such as an electrode, a lead wire and the like to be electrically connected with the circuit, the material of the shell comprises but is not limited to an insulating material such as plastic, and the shell can isolate the static contact 14, the insulating cover 142 and the moving assembly 13 from the outside to achieve the insulation protection effect.

[0031] The high-voltage direct-current relay 10 provided in the application is beneficial to reduce the preparation cost and compress the volume, and can effectively support the moving spring mechanism 131, reduce the distance between the moving contact points 1313 and the static contact points 141 to reduce the heat generated by the arc phenomenon, and avoid the damage of the high-voltage direct-current relay 10 caused by the separation of the moving assembly 13 and the electromagnetic assembly 12 from the static contact 14. The high-voltage direct-current relay 10 provided in the application can be used in a circuit with high current, for example, in a circuit with a working current of 8kA or less, and the high-voltage direct-current relay 10 comprises but is not limited to a battery pack circuit for a new energy vehicle, and the high-voltage direct-current relay 10 can also be used in a circuit of any other applicable device as a switching element, which will not be described in detail in the application.

[0032] In some embodiments, the pushing mechanism 133 comprises a pushing seat 1331 and a pushing rod 1332 connected to the pushing seat 1331 on the side opposite to the moving spring mechanism 131, and the electromagnetic assembly 12 can comprise an upper iron core 121, a lower iron core 122, and a coil arranged around the upper iron core 121 and the lower iron core 122, wherein the upper iron core 121 is fixedly arranged on the base 11, and the lower iron core 122 and the coil can be arranged in the base 11. The pushing rod 1332 penetrates the upper iron core 121 and is inserted into the lower iron core 122, and the pushing rod 1332 is in sliding fit with the upper iron core 121. When the coil is energized, the upper iron core 121 and the lower iron core 122 can be magnetized, so that the upper iron core 121 and the lower iron core 122 are attracted to each other and the lower iron core 122 moves towards the upper iron core 121, thereby driving the pushing rod 1332 to move the moving assembly 13 as a whole towards the static contact 141.

[0033] In some embodiments, the moving assembly 13 further comprises a bracket 135 connected to the pushing seat 1331 and in sliding fit with the moving spring mechanism 131. For example, the bracket 135 can comprise two first arms 1351 and a second arm, the two first arms 1351 are respectively located on the two sides of the elastic element 132 and the moving spring mechanism 131 in the axial direction and are directly or indirectly connected to the pushing seat 1331. The two ends of the second arm are respectively connected to the two first arms 1351 and are located on the side of the moving assembly 13 opposite to the pushing seat 1331. The two first arms 1351 are in sliding fit with the moving spring mechanism 131 on the two opposite sides of the moving spring mechanism 131, so that the moving spring mechanism 131 moves relative to the pushing seat 1331 in the direction of approaching or moving away from the static contact 141, thereby causing the elastic element 132 to elastically deform. The sliding limiting of the two first arms 1351 to the moving spring mechanism 131 can provide a guiding effect for the movement of the moving spring mechanism 131 relative to the pushing seat 1331, thereby improving the performance stability of the high-voltage DC relay 10, and the second arm can limit the limit position of the moving spring mechanism 131 away from the pushing seat 1331 on the side of the moving spring mechanism 131 towards the static contact 141, thereby preventing the moving spring mechanism 131 from being separated from the pushing seat 1331 and improving the performance stability of the high-voltage DC relay 10.

[0034] Further, in some embodiments, the moving spring mechanism 131 is formed with at least one sliding structure 1315, and at least one first arm 1351 of the bracket 135 is provided with a sliding groove 1356, at least part of the sliding structure 1315 is slidably arranged in the sliding groove 1356 to realize the sliding cooperation between the bracket 135 and the moving spring mechanism 131. The side wall of the sliding groove 1356 is located at the side of the sliding structure 1315 facing the pushing seat 1331, and the part opposite to the sliding structure 1315 forms a supporting surface 1362. The supporting surface 1362 is located between the moving spring mechanism 131 and the pushing seat 1331 and is arranged in a spaced manner from the moving spring mechanism 131 and the pushing seat 1331. The supporting surface 1362 can abut against the sliding structure 1315 at one of the positions on the path of the moving spring mechanism 131 moving towards the pushing seat 1331, thereby supporting the moving spring mechanism 131. In the present application, the moving contact 1313 and the stationary contact 141 are spaced, and the electromagnetic assembly 12 does not exert force on the pushing rod 1332, which is called the initial state of the high-voltage DC relay 10 in which the circuit is disconnected. In the initial state, the supporting surface 1362 is spaced from the moving spring mechanism 131. When it is necessary to contact the moving contact 1313 and the stationary contact 141 to conduct the circuit, the lower core 122 of the electromagnetic assembly 12 moves towards the upper core 121, which can drive the pushing mechanism 133 through the pushing rod 1332, thereby driving the moving spring mechanism 131 to move towards the stationary contact 141, so that the moving assembly 13 has a first state and a second state.

[0035] In combination with FIGS. 4 and 5, when the moving assembly 13 moves to the first state, the moving contact 1313 is just in contact with the stationary contact 141, and the high-voltage DC relay 10 conducts the circuit. In the first state, the length of the elastic element 132 is the same as that in the initial state. That is, in the process of driving the moving spring mechanism 131 by the pushing mechanism 133 to move towards the stationary contact 141 to switch from the initial state to the first state, the moving spring mechanism 131, the bracket 135, the elastic element 132 and the pushing mechanism 133 are synchronously moved.

[0036] After the electromagnetic assembly 12 drives the dynamic spring mechanism 131 to move to the first state through the pushing mechanism 133, the electromagnetic assembly 12 continues to drive the pushing mechanism 133 to move towards the static contact 141 to the second state. During the switching from the first state to the second state, since the dynamic contact 1313 is in contact with the static contact 141, the dynamic contact 1313 is relatively fixed with the static contact 141, and the pushing mechanism 133 continues to move towards the static contact 141, which will cause the distance between the pushing seat 1331 and the dynamic spring mechanism 131 to decrease. That is, during the switching from the first state to the second state, the dynamic spring mechanism 131 and the pushing seat 1331 are relatively close, and the dynamic spring mechanism 131 and the pushing seat 1331 will extrude the elastic element 132, so that the length of the elastic element 132 decreases, and the elastic element 132 elastically deforms. It can be understood that in the first state and the second state, the dynamic contact 1313 is in contact with the static contact 141, and the elastic force exerted by the elastic element 132 on the dynamic contact 1313 in the second state is greater than that in the first state. The second state enables the elastic element 132 to abut the dynamic contact 1313 against the static contact 141, thereby improving the stability and reliability of the contact between the dynamic contact 1313 and the static contact 141. At the same time, the elastic element 132 can cooperate with the electromagnetic assembly 12 to offset the electrodynamic repulsive force between the dynamic contact 1313 and the static contact 141, which is conducive to reducing the holding force requirement of the high-voltage direct-current relay 10 on the electromagnetic assembly 12, and is conducive to reducing the cost and volume of the electromagnetic assembly 12.

[0037] It can be understood that during the switching from the initial state to the first state and during the switching from the first state to the second state, the lower core 122 gradually approaches the upper core 121, and in the first state, the lower core 122 is spaced apart from the upper core 121, and in the second state, the lower core 122 can be in contact with the upper core 121, which is conducive to improving the magnetic attraction between the upper core 121 and the lower core 122, thereby improving the holding force of the electromagnetic assembly 12 on the dynamic assembly 13.

[0038] In some embodiments, by designing the position of the supporting surface 1362 between the pushing seat 1331 and the dynamic spring mechanism 131, the supporting surface 1362 is still spaced apart from the sliding structure 1315 of the dynamic spring mechanism 131 in the second state, and the distance between the dynamic spring mechanism 131 and the supporting surface 1362 in the second state is smaller than that in the first state. Moreover, the distance between the supporting surface 1362 and the pushing seat 1331 is greater than the limit compression length of the elastic element 132, that is, in the second state, the difference between the length of the elastic element 132 and the limit compression length of the elastic element 132 is greater than the distance between the sliding structure 1315 and the supporting surface 1362, and the length of the elastic element 132 can be equal to the distance between the dynamic spring mechanism 131 and the pushing seat 1331.

[0039] With reference to FIG. 6, it can be understood that when the circuit is short-circuited or overloaded, for example, the current exceeds 8kA, the electric repulsion between the moving contact 1313 and the static contact 141 is greater than the elastic force exerted on the moving contact 1313 by the elastic element 132 and the holding force of the electromagnetic assembly 12, the moving contact 1313 and the static contact 141 are repelled, the moving assembly 13 moves towards the pushing seat 1331, and further extrudes the elastic element 132, until the sliding structure 1315 abuts against the supporting surface 1362, the supporting surface 1362 provides a supporting action on the moving assembly 13, so that the moving assembly 13 cannot move towards the pushing seat 1331 any more. In the present application, the state in which the supporting surface 1362 abuts against the sliding structure 1315 to provide a supporting action on the moving assembly 13 is referred to as the third state of the moving assembly 13, in the third state, the moving spring mechanism 131, the bracket 135 and the pushing mechanism 133 are relatively fixed, and the electromagnetic assembly 12 bears the impact force of the moving spring mechanism 131.

[0040] It can be understood that the supporting surface 1362 of the moving assembly 13 only contacts the moving spring mechanism 131 to provide a supporting action in the third state, and in other states, the supporting surface 1362 does not interfere with the movement of the moving spring mechanism 131, which is beneficial to avoid the setting of the supporting surface 1362 to increase the risk of the moving spring mechanism 131 being stuck, uneven force or wear and tear, and other types of interference such as sliding fit and limiting fit, while achieving the supporting action, it is also beneficial to maintain the structural reliability of the moving assembly 13, and has less impact on the contact reliability of the moving assembly 13.

[0041] The high-voltage DC relay 10, the support 135 is formed with a support surface 1362 capable of supporting the moving spring mechanism 131 on the path of the moving spring mechanism 131 moving towards the push mechanism 133, when the circuit connected to the high-voltage DC relay 10 is short-circuited or overloaded, the moving contact 1313 of the moving spring mechanism 131 and the static contact 141 of the static contact 14 are repelled due to the electrodynamic repulsion, the moving spring mechanism 131 can first compress the elastic element 132 until the support surface 1362 supports the sliding structure 1315 so that the moving spring mechanism 131 is relatively fixed with the push mechanism 133. Because the moving contact 1313 and the static contact 141 are repelled, the electrodynamic repulsion between the moving contact 1313 and the static contact 141 disappears, and during the movement of the moving spring mechanism 131 towards the static contact 141, the elastic element 132 can effectively buffer the kinetic energy of the moving spring mechanism 131, and the elastic element 132 will not be compressed to the limit compression length, so that when the support surface 1362 supports the sliding structure 1315, the impact of the moving spring mechanism 131 on the push mechanism 133 and the electromagnetic assembly 12 will not be too large, avoiding the impact being too large to cause the moving assembly 13 and the electromagnetic assembly 12 to be separated from the static contact 14, thereby causing the high-voltage DC relay 10 to be damaged. Moreover, the support of the support surface 1362 to the moving spring mechanism 131 makes the moving spring mechanism 131 unable to continue to move away from the static contact 141, and the distance between the moving spring mechanism 131 and the push seat 1331 is still greater than the limit compression length of the elastic element 132, which is beneficial to reduce the relative repelling distance between the moving contact 1313 and the static contact 141, and the design of the elastic element 132 can avoid the moving assembly 13 from being separated from the static contact 14, so that the distance between the moving contact 1313 and the static contact 141 will not be too far, thereby avoiding the generation of excessive heat due to the arc phenomenon between the moving contact 1313 and the static contact 141, thereby avoiding the damage or even explosion of the high-voltage DC relay 10. Moreover, the buffering of the elastic element 132 to the moving spring mechanism 131 can also reduce the requirement for the holding force of the moving assembly 13 to the electromagnetic assembly 12, so that the core of the electromagnetic assembly 12 can support the entire moving assembly 13 with a smaller holding force, thereby facilitating the reduction of the number of turns of the coil of the electromagnetic assembly 12 and / or the volume of the core, thereby facilitating the miniaturization design of the high-voltage DC relay 10.

[0042] Therefore, the high-voltage DC relay 10 described above, during the process of switching from the second state to the third state, first buffers the impact of the moving spring mechanism 131 through the elastic element 132, and then bears the impact of the moving spring mechanism 131 through the electromagnetic assembly 12, which is beneficial to reduce the requirement for the holding force of the electromagnetic assembly 12, reduce the cost and volume of the electromagnetic assembly 12, and also reduce the repelling distance between the moving contact 1313 and the static contact 141, thereby reducing the heat generated by the arc phenomenon. The high-voltage DC relay 10 can balance the small volume, low cost, and high short-circuit current and voltage resistance effects.

[0043] In some embodiments, the elastic element 132 is arranged between the push seat 1331 and the moving spring mechanism 131, and the two ends of the elastic element 132 abut against the moving spring mechanism 131 and the push seat 1331 respectively. The two ends of the elastic element 132 can be connected to the moving spring mechanism 131 and the push seat 1331 respectively. In this way, the space layout among the moving spring mechanism 131, the elastic element 132 and the push mechanism 133 can be reasonably planned, so that the structure is more compact, which is beneficial to improve the space utilization efficiency of the moving assembly 13, and also beneficial to make the elastic element 132 relatively far away from the contact position of the moving contact 1313 and the static contact 141, reduce the influence of high temperature and ablation spatter on the elastic element 132, and reduce the assembly difficulty of the elastic element 132 and other components.

[0044] In some embodiments, as shown in FIG. 7, FIG. 8 and FIG. 9, in some embodiments, the moving spring mechanism 131 includes a moving spring sheet 1311 and a lower armature 1314 fixedly connected to the moving spring sheet 1311, and the high-voltage direct-current relay 10 further includes an upper armature 143 opposite to the lower armature 1314, and the moving contact 1313 is arranged on the side of the moving spring sheet 1311 facing the static contact 14. The upper armature 143 and the lower armature 1314 jointly constitute an anti-short circuit ring structure, and the upper armature 143 is located on the side of the lower armature 1314 away from the push seat 1331. The upper armature 143 can be fixed to the bracket 135 and located on the side of the moving spring sheet 1311 away from the push seat 1331. The upper armature 143 can also be arranged on the static contact 14. For example, the high-voltage direct-current relay 10 includes an insulating cover 142, the static contact 14 and the upper armature 143. The insulating cover 142 covers the moving assembly 13 and is arranged on the base 11. The static contact 14 and the upper armature 143 are both fixedly arranged on the insulating cover 142. The static contact 14 protrudes out of the outside of the insulating cover 142 on the side away from the moving spring mechanism 131, i.e. on the side away from the static contact 141. When the moving contact 1313 and the static contact 141 are in contact, the magnetic field generated by the moving contact 1313 and the static contact 141 can magnetize the upper armature 143 and the lower armature 1314, so that the upper armature 143 and the lower armature 1314 attract each other, which can provide a holding force for the moving contact 1313 and the static contact 141, and is beneficial to reduce the holding force required by the electromagnetic assembly 12, and also beneficial to reduce the cost and volume of the electromagnetic assembly 12.

[0045] In some embodiments, when the upper armature 143 is arranged on the insulating cover 142, the upper armature 143 can be arranged corresponding to the static contact 141 and located between the insulating cover 142 and the moving spring 1311, and the upper armature 143 can also limit the moving spring 131 on the side of the moving spring mechanism 131 away from the push base 1331, to limit the limit position of the moving spring mechanism 131 away from the push base 1331. Thus, when the upper armature 143 is arranged on the insulating cover 142, the support 135 of the moving assembly 13 can omit the second supporting arm and only have two first supporting arms 1351 connected with the push base 1331 and located on the two sides of the moving spring mechanism 131. Of course, when the upper armature 143 is arranged on the insulating cover 142, the upper armature 143 and the moving spring 1311 can also be spaced by the second supporting arm of the support 135, and the second supporting arm limits the limit position of the moving spring mechanism 131 away from the push base 1331. In any of the above-mentioned embodiments of the different forming modes of the supporting surface 1362, the upper armature 143 can also be arranged on the support 135 or the insulating cover 142 of the static contact 14.

[0046] When the high-voltage DC relay 10 is provided with the short circuit ring structure, the supporting surface 1362 can be directly opposite to one of the lower armature 1314 or the moving spring 1311, as long as it can abut one of the upper armature 143 and the moving spring 1311 on the path of the moving spring mechanism 131 moving towards the push base 1331, to provide a supporting effect on the moving spring mechanism 131. Of course, the moving assembly 13 can also be provided with a plurality of supporting surfaces 1362, and the plurality of supporting surfaces 1362 are directly opposite to the moving spring 1311 and the upper armature 143 respectively, and the supporting surfaces 1362 can abut the moving spring 1311 and the upper armature 143 at the same time, to realize a more stable and reliable supporting effect on the moving assembly 13. In some embodiments, the moving assembly 13 is formed with at least two supporting surfaces 1362, and the at least two supporting surfaces 1362 are located on the two sides of the elastic element 132 in the axial direction, and the at least two supporting surfaces 1362 can be directly opposite to one of the moving spring 1311 and the upper armature 143, or directly opposite to the moving spring 1311 and the upper armature 143 respectively. The arrangement of at least two opposite supporting surfaces 1362 in multiple positions simultaneously provides a uniformly distributed supporting effect on the moving spring mechanism 131, and cooperates with the guiding effect of the support 135 on the moving spring mechanism 131, to improve the stability and reliability of the movement of the moving spring mechanism 131 relative to the push base 1331, and avoid the deflection of the moving spring mechanism 131. Of course, the short circuit ring structure can also be omitted, and the two sides of the moving spring 1311 can abut the second supporting arm and the elastic element 132 respectively.

[0047] It can be understood that, as shown in FIGS. 5 and 6, when the upper armature 143 is arranged on the bracket 135, for example, on the second branch arm and between the second branch arm and the moving spring 1311, if the upper armature 143 and the lower armature 1314 are in contact in the first state, in the second state, the moving spring 1311 and the lower armature 1314 as a whole move a certain distance towards the push seat 1331 relative to the first state, and the upper armature 143 and the lower armature 1314 are spaced apart. When the upper armature 143 is arranged on the insulating cover 142, if the lower armature 1314 is in contact with the upper armature 143 in the first state, in the second state, the upper armature 143 and the lower armature 1314 are also spaced apart. In other embodiments, the high-voltage DC relay 10 can also install the upper armature 143 through a carrier structure arranged on the base 11 to fix the upper armature 143 between the insulating cover 142 and the lower armature 1314, as long as the upper armature 143 and the lower armature 1314 can attract each other in the first state and the second state to provide a holding force for the contact between the moving contact 1313 and the static contact 141.

[0048] In some embodiments, the bracket 135 can be directly connected to the push seat 1331, and the moving assembly 13 can also include a fixing piece connected to the bracket 135 and the push seat 1331, and the bracket 135 is indirectly connected to the push seat 1331 through the fixing piece. It should be noted that in the present application, the forming structure and forming position of the support surface 1362 are not limited, as long as the support surface 1362 can provide a support function to the moving assembly 13 on the path of the moving assembly 13 moving towards the push seat 1331. The following illustrates an example of forming the support surface 1362 on the bracket 135 in one embodiment.

[0049] Please refer to FIGS. 1, 2 and 3 again, in some embodiments, the side wall of the sliding groove 1356 is located on the side of the sliding structure 1315 towards the push seat 1331, and the part opposite to the sliding structure 1315 forms the support surface 1362, which supports the moving spring mechanism 131 by abutting the sliding structure 1315 on the path of the moving spring mechanism 131 moving towards the push seat 1331. The support surface 1362 is formed by the sliding groove 1356 which realizes the sliding cooperation between the sliding structure 1315 of the moving spring mechanism 131 and the first branch arm 1351, which not only improves the reliability of the guiding and limiting function of the bracket 135 to the moving spring mechanism 131, but also helps to improve the structural utilization efficiency of the moving assembly 13 and compress the occupied space and setting cost of the moving assembly 13.

[0050] In the embodiment, the two first arms 1351 are each provided with a sliding groove 1356, the moving spring mechanism 131 is provided with two sliding structures 1315, the two sliding structures 1315 are respectively protruded towards the two first arms 1351 and are respectively slidably arranged in the corresponding sliding grooves 1356, and the two first arms 1351 are respectively formed with a support surface 1362 located at the opposite sides of the moving spring plate 1311. The moving spring mechanism 131 is supported and guided at the opposite sides of the moving spring plate 1311, so that the stability and reliability of the support and guidance are improved. When the moving spring mechanism 131 is provided with the lower armature 1314, the sliding structure 1315 can be protruded at one side or opposite sides of the lower armature 1314 towards the first arm 1351, or can be protruded at one side or opposite sides of the moving spring plate 1311 towards the first arm 1351. When the moving spring mechanism 131 is not provided with the lower armature 1314, the sliding structure 1315 can be protruded at one side or opposite sides of the moving spring plate 1311 towards the first arm 1351. The sliding structure 1315 can be integrally formed with the moving spring plate 1311 or the lower armature 1314.

[0051] In some embodiments, the moving spring plate 1311 can include two sub-spring plates arranged side by side and spaced apart from each other (not shown in the figure). When the moving spring mechanism 131 is provided with the lower armature 1314, the lower armature 1314 can be connected to the two sub-spring plates at the same time. The lower armature 1314 can also include two sub-armatures spaced apart from each other, and the two sub-armatures are connected to the two sub-spring plates one by one. Each moving contact 1313 of the moving spring plate 1311 can be formed by the corresponding positions of the two sub-spring plates. In this way, the two sub-spring plates can provide more stable electrical contact, reduce poor contact caused by wear or damage of a single spring plate, share the mechanical load of the moving contact 1313, reduce the stress of a single spring plate, improve the durability of the high-voltage DC relay 10, provide more uniform current distribution, reduce arc phenomenon and contact resistance, and improve electrical contact performance. In addition, when one of the sub-spring plates fails, the other sub-spring plate can still realize the on-off control with the static contact 141, thereby improving the performance reliability of the high-voltage DC relay 10. Of course, in other arbitrary embodiments in which the support surface 1362 is formed on other components or positions, the moving spring plate 1311 can be an integral whole or can be provided with two sub-spring plates, as long as the support function of the support surface 1362 to the moving spring mechanism 131 is not affected. Details are not described herein.

[0052] In the present application, the elastic element 132 includes but is not limited to any applicable elastic component such as a spring or a compression spring, and the connection arrangement and orientation between the elastic element 132, the moving spring mechanism 131 and the pushing mechanism 133 are not limited, as long as the elastic element 132 can realize the elastic cooperation between the moving spring mechanism 131 and the pushing mechanism 133 to buffer the moving spring mechanism 131 during the switching from the second state to the third state.

[0053] Each technical feature of the above-described embodiments can be combined with any other technical feature, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure encompasses all such possible combinations.

[0054] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A high-voltage direct current relay, comprising: an insulating cover; a fixed contact provided with a fixed contact point, the fixed contact being fixed relative to the insulating cover and a side of the fixed contact facing away from the fixed contact point protruding outside the insulating cover; and a moving assembly comprising a pushing mechanism, a moving contact spring mechanism, an elastic element and a bracket, the moving contact spring mechanism being provided with a moving contact point opposite the fixed contact point, the moving contact spring mechanism being elastically connected to the pushing mechanism through the elastic element, and the bracket being connected to the pushing mechanism; the moving contact spring mechanism is provided with a sliding structure, the bracket is provided with a sliding groove in sliding cooperation with the sliding structure, a side wall of the sliding groove is formed with a support surface located at a side of the sliding structure facing the pushing mechanism, the support surface is spaced apart from the sliding structure, and the support surface is used to abut the sliding structure at one of positions on a path of the moving contact spring mechanism moving away from the fixed contact when a short-circuit current occurs to cause the moving contact point and the fixed contact to be separated, so as to support the sliding structure. The sliding structure is at least partially slidably arranged in the sliding groove, and a part of the side wall of the sliding groove located at a side of the sliding structure facing the pushing mechanism forms the support surface. The bracket comprises at least two first supporting arms, the at least two first supporting arms are located at two sides of the elastic element in an axial direction and are both connected to the pushing mechanism, the at least two opposite first supporting arms are provided with the sliding groove opposite the moving contact spring mechanism, the moving contact spring mechanism is provided with the sliding structure at two opposite sides thereof, and the two sliding structures are embedded in the corresponding sliding grooves one by one. The pushing mechanism can drive the moving contact spring mechanism to move towards the fixed contact point, so that the moving assembly has a first state in which the moving contact point is just in contact with the fixed contact point and a second state in which the moving contact point is abutted against the fixed contact point by the elastic element, the sliding structure is spaced apart from the support surface, the pushing mechanism moves relative to the moving contact spring mechanism towards the fixed contact point in a process of switching from the first state to the second state, and a distance between the sliding structure and the support surface in the second state is smaller than that in the first state. In the second state, a difference between a length of the elastic element and a limit compression length of the elastic element is greater than the distance between the sliding structure and the support surface. The moving contact point can be separated relative to the fixed contact point under the action of an electric repulsive force to switch from the second state to a third state, in the third state, the support surface abuts the sliding structure to make the moving contact spring mechanism relatively fixed with the pushing mechanism, and the length of the elastic element is greater than the limit compression length of the elastic element.

2. The high-voltage DC relay according to claim 1, wherein The moving contact spring mechanism comprises a relatively fixed lower armature and a moving contact spring sheet, and the moving contact point is arranged at a side of the moving contact spring sheet facing the fixed contact.

3. The high-voltage DC relay according to claim 1, wherein, The sliding structure is protruded at a side of the moving contact spring sheet facing the bracket.

4. The high-voltage DC relay of claim 1, wherein, The sliding structure is protruded at a side of the lower armature facing the bracket.

5. The high-voltage DC relay according to claim 4, wherein, ​ 6. The high-voltage DC relay of claim 4, wherein, ​ 7. The high-voltage DC relay of claim 4, wherein, ​ 8. The high-voltage DC relay according to claim 7, wherein, ​ 9. The high-voltage DC relay of claim 7, wherein, ​ 10. The high-voltage DC relay of claim 7, wherein, The sliding structure is integrally formed with the moving spring or the lower armature.

11. The high-voltage DC relay of claim 7, wherein, The HVDC relay further comprises an upper armature opposite to the lower armature, and the upper armature and the lower armature are capable of attracting each other when the moving contact and the stationary contact are in contact.

12. The high-voltage DC relay of claim 11, wherein, The upper armature is arranged on the bracket.

13. The high-voltage DC relay of claim 12, wherein, In the first state, the upper armature and the lower armature are in contact, and in the second state, the upper armature and the lower armature are spaced apart.

14. The high-voltage DC relay of claim 11, wherein, The upper armature is arranged outside the moving assembly and is fixed opposite to the stationary contact.

15. The high-voltage DC relay according to any one of claims 1-14, wherein, The HVDC relay further comprises a base and an electromagnetic assembly, the electromagnetic assembly and the stationary contact are arranged on the base, the pushing mechanism comprises a pushing seat connected to the bracket and a pushing rod arranged on the side of the pushing seat away from the moving spring mechanism, the pushing rod is inserted into the electromagnetic assembly, and the electromagnetic assembly is used to drive the pushing seat to move towards the stationary contact or away from the stationary contact through the pushing rod.

16. The high-voltage DC relay of claim 15, wherein, The elastic element is arranged between the pushing seat and the moving spring mechanism, and two ends thereof are respectively abutted against the moving spring mechanism and the pushing seat.

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