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 static contact (14) is provided with a static contact point (141). The moving assembly (13) comprises a pushing mechanism (133), a moving spring mechanism (131), an elastic element (132), and a support (135); the pushing mechanism (133) comprises a pushing seat (1331), and a pushing rod (1332) and a support structure (136) connected to the pushing seat (1331); the moving spring mechanism (131) is arranged on the side of the support structure (136) facing away from the pushing seat (1331), and is provided with a moving contact point opposite to the static contact point (141); 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 seat (1331) and works in sliding cooperation with the moving spring mechanism (131); the support structure (136) is provided with a support surface (1362) arranged apart from the moving spring mechanism (131); and the support surface (1362) can support the moving spring mechanism (131) on the path along which the moving spring mechanism (131) moves away from the static contact point (141).

Description

High-voltage direct-current relay

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 2024108318764, 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, 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 attract 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, the moving contact and the static contact will be repelled due to the electrodynamic repulsion force, and an arc phenomenon will occur between the moving contact and the static contact, resulting in damage to the relay. The miniaturization and short-circuit resistance of the high-voltage direct-current relay are increasingly demanded in the new energy industry and other industries that use high-voltage circuits. 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 head provided with a static contact, the static contact head being fixed relative to the insulating cover, and a side of the static contact head opposite to the static contact protruding out of the insulating cover; and

[0009] a moving assembly including a pushing mechanism, a moving spring mechanism, an elastic element, and a bracket, the pushing mechanism including a pushing seat, a pushing rod connected to the pushing seat, and a support structure, the moving spring mechanism being provided on a side of the support structure opposite to the pushing seat and provided with a moving contact opposite to the static contact, the moving spring mechanism being elastically matched with the pushing mechanism through the elastic element, and the bracket being connected to the pushing seat and being slidingly matched with the moving spring mechanism;

[0010] The support structure has a support surface disposed in spaced relation to the moving spring mechanism, the support surface for supporting the moving spring mechanism on a path of movement of the moving spring mechanism away from the stationary contact when the short circuit current occurs to cause the moving contact and the stationary contact to spring apart.

[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 accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort based on the disclosed drawings.

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

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

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

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

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

[0020] Fig. 8 is a structural schematic diagram of a moving assembly in which a moving spring leaf includes two sub-spring leaves in some embodiments.

[0021] Fig. 9 is a structural schematic diagram of the moving assembly shown in Fig. 8 from another angle. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in the embodiments of the present application in combination with the accompanying drawings. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing 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 there are terms such as "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features defined as "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, such as two, three, etc., unless otherwise explicitly specified and limited.

[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 broadly understood. 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 skilled 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 otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be 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 "above", "above" and "above" of 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 "below", "below" and "below" of 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 is to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it will be understood that when a layer is referred to as being "connected," "coupled," or "supported" on another layer or substrate, it can be directly on the other layer or substrate or intervening layers can also be present. As used herein, the terms "vertical," "horizontal," "up," "down," "left," "right," and the like are used for clarity to describe the orientation of various elements as they are shown in the figures. These terms are not intended to limit the position of the elements relative to one another.

[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, 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 repelled 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 separated as a whole, 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 and burning out the high-voltage DC relay, or even causing the high-voltage DC relay to explode. However, in order to improve 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 repelling 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 diagram of the structure of the high-voltage DC relay 10 in some embodiments, FIG. 2 is a schematic diagram of the structure of the 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 DC relay 10 comprises a base 11, an electromagnetic assembly 12, a 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 two static contacts 14 are each provided with a static contact point 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 to 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 as to make the moving contact points 1313 contact with the static contact points 141 or make the moving contact points 1313 separate from the static contact points 141. It can be understood that the high-voltage DC relay 10 can be applied to a circuit as a switching element, the static contact 14 can be provided with a lead-out end electrically connected to the two static contact points 141, and the lead-out end is electrically connected to 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 DC relay 10 is opened, and when the moving contact points 1313 separate 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 DC relay 10 is closed. In some embodiments, the high-voltage DC 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 or the like to be electrically connected to 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 DC 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 DC relay 10 caused by the separation of the moving assembly 13 and the electromagnetic assembly 12 from the static contact 14. The high-voltage DC 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 DC relay 10 comprises but is not limited to a battery pack circuit for a new energy vehicle, and the high-voltage DC 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 1357, 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 1357 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 towards or 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 guide 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 1357 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 pushing mechanism 133 further comprises a support structure 136 disposed on the side of the pushing seat 1331 facing the moving spring mechanism 131, and the side of the support structure 136 facing the moving spring mechanism 131 forms a support surface 1362. The support surface 1362 is located between and spaced apart from the moving spring mechanism 131 and the pushing seat 1331, and the support surface 1362 can support the moving spring mechanism 131 in the path of the moving spring mechanism 131 moving towards the pushing seat 1331. In this application, the state in which the moving contact 1313 and the stationary contact 141 are spaced apart and the electromagnetic assembly 12 does not exert a force on the pushing rod 1332, i.e. the state in which the high-voltage DC relay 10 breaks the circuit, is referred to as the initial state, and in the initial state, the support surface 1362 is spaced apart 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, and the pushing mechanism 133 driven by the pushing rod 1332 in turn drives 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. As shown in 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, and 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 move synchronously.

[0035] After the electromagnetic assembly 12 drives the moving 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, the moving contact 1313 is relatively fixed with the static contact 141 due to the contact between the moving contact 1313 and the static contact 141, and the pushing mechanism 133 continues to move towards the static contact 141, which causes the distance between the pushing seat 1331 and the moving spring mechanism 131 to decrease. That is, during the switching from the first state to the second state, the moving spring mechanism 131 and the pushing seat 1331 are relatively close, and the moving 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 moving contact 1313 is in contact with the static contact 141, and the elastic force applied by the elastic element 132 to the moving 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 moving contact 1313 against the static contact 141, improves the stability and reliability of the contact between the moving contact 1313 and the static contact 141, and enables the elastic element 132 to offset the electrodynamic repulsive force between the moving contact 1313 and the static contact 141, which is beneficial to reduce the holding force requirement of the high-voltage direct-current relay 10 on the electromagnetic assembly 12 and is beneficial to reduce the cost and volume of the electromagnetic assembly 12.

[0036] 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 beneficial to improve the magnetic attraction force between the upper core 121 and the lower core 122, thereby improving the holding force of the electromagnetic assembly 12 on the moving assembly 13.

[0037] In some embodiments, the position of the support surface 1362 between the push seat 1331 and the moving spring mechanism 131 is designed such that in the second state, the support surface 1362 is still spaced apart from the moving spring mechanism 131, and the distance between the moving spring mechanism 131 and the support surface 1362 in the second state is smaller than in the first state. Moreover, the distance between the support surface 1362 and the push 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 moving spring mechanism 131 and the support surface 1362, and the length of the elastic element 132 can be equal to the distance between the moving spring mechanism 131 and the push seat 1331. In combination with FIG. 6, it can be understood that when the circuit is short-circuited or overloaded, for example, the current exceeds 8kA, the electrodynamic repulsive force 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 push seat 1331, and further extrudes the elastic element 132, until the moving assembly 13 abuts against the support surface 1362, the support surface 1362 provides a supporting action on the moving assembly 13, so that the moving assembly 13 cannot move towards the push seat 1331 any more. In this application, the state in which the support surface 1362 abuts against the moving assembly 13 to provide a supporting action on the moving assembly 13 is referred to as the third state of the moving assembly 13, and in the third state, the moving spring mechanism 131, the bracket 135 and the push mechanism 133 are relatively fixed, and the electromagnetic assembly 12 bears the impact force of the moving spring mechanism 131.

[0038] It can be understood that the support surface 1362 of the moving assembly 13 only contacts the moving spring mechanism 131 to achieve a supporting action in the third state, and in other states, the support surface 1362 does not interfere with the movement of the moving spring mechanism 131, which is beneficial to avoid the setting of the support surface 1362 to increase the risk of the moving spring mechanism 131 being stuck, uneven force or wear and tear, etc. due to other types of interference such as sliding fit, limiting fit, etc. while achieving the supporting action, which 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.

[0039] The support structure 136 of the push mechanism 133 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 moving spring mechanism 131 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 to the support surface 1362, 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 moving spring mechanism 131, 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 whole moving assembly 13 and electromagnetic assembly 12 from being separated from the static contact 14 due to excessive impact, which can cause 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 not 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 cooperate with the buffering of the elastic element 132 to avoid the design of the moving assembly 13 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 phenomenon of excessive heat generated by the arc between the moving contact 1313 and the static contact 141, which can cause the high-voltage DC relay 10 to be damaged or even explode. Moreover, the buffering of the elastic element 132 to the moving spring mechanism 131 can also reduce the holding force requirement of the moving assembly 13 to the electromagnetic assembly 12, so that the core of the electromagnetic assembly 12 can support the whole moving assembly 13 with smaller holding force, thereby facilitating the reduction of the number of turns of the coil and / or the volume of the core of the electromagnetic assembly 12, thereby facilitating the miniaturization design of the high-voltage DC relay 10.

[0040] 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 spatial 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 conducive to improving the space utilization efficiency of the moving assembly 13, and also conducive to making the elastic element 132 relatively far away from the contact position of the moving contact 1313 and the static contact 141, reducing the influence of high temperature and ablation splashes on the elastic element 132, and reducing the assembly difficulty of the elastic element 132 and other components. It can be understood that when the support surface 1362 is located between the moving spring mechanism 131 and the push seat 1331, the support surface 1362 is farther away from the contact position of the moving contact 1313 and the static contact 141, which is also conducive to reducing the influence of high temperature and ablation splashes on the support surface 1362, for example, avoiding the influence of the second state to the third state switching caused by the decrease of the distance between the support surface 1362 and the moving spring mechanism 131 due to splashes.

[0041] Therefore, in the process of switching from the second state to the third state, the high-voltage DC relay 10 described above 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 conducive to reducing the demand for holding force of the electromagnetic assembly 12, reducing the cost and volume of the electromagnetic assembly 12, and also reducing the repulsion 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 small size, low cost, and high short-circuit current and voltage resistance.

[0042] In some embodiments, as shown in FIG. 5 and FIG. 7, in some embodiments, the moving spring mechanism 131 includes a moving spring piece 1311 and a lower armature 1314 fixedly connected with the moving spring piece 1311, the high-voltage DC relay 10 further includes an upper armature 143 opposite to the lower armature 1314, the moving contact 1313 is arranged on the side of the moving spring piece 1311 facing the static contact 14, the upper armature 143 and the lower armature 1314 jointly form 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 base 1331. The upper armature 143 can be fixed on the bracket 135 and located on the side of the moving spring piece 1311 away from the push base 1331, or the upper armature 143 can be arranged on the static contact 14, for example, the high-voltage DC 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, and the static contact 14 protrudes out of the side of the insulating cover 142 away from the moving spring mechanism 131, i.e. away from the side of 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 size of the electromagnetic assembly 12.

[0043] 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 piece 1311, and then the upper armature 143 can also limit the moving spring mechanism 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 bracket 135 of the moving assembly 13 can omit the second branch arm 1357, and only two first branch arms 1351 are arranged to connect with the push base 1331 and located on the two sides opposite to 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 piece 1311 can also be spaced apart by the second branch arm 1357 of the bracket 135, and then the second branch arm 1357 limits the limit position of the moving spring mechanism 131 away from the push base 1331.

[0044] In combination with FIGS. 5 and 6, when the high-voltage DC relay 10 is provided with the short-circuit ring structure, the support surface 1362 can be directly opposite one of the lower armature 1314 or the moving reed 1311, as long as it can abut one of the upper armature 143 and the moving reed 1311 on the path of the moving reed mechanism 131 moving towards the push seat 1331, so as to provide a support effect for the moving reed mechanism 131. Of course, the moving assembly 13 can also be provided with a plurality of support surfaces 1362, which are directly opposite the moving reed 1311 and the upper armature 143 respectively, and the support surfaces 1362 can simultaneously abut the moving reed 1311 and the upper armature 143, so as to achieve a more stable and reliable support effect for the moving assembly 13. In some embodiments, the moving assembly 13 is formed with at least two support surfaces 1362 located on the opposite sides of the elastic element 132 in the axial direction, which can be directly opposite one of the moving reed 1311 and the upper armature 143, or directly opposite the moving reed 1311 and the upper armature 143 respectively. The at least two opposite support surfaces 1362 are arranged to simultaneously provide a uniformly distributed support effect for the moving reed mechanism 131 in multiple positions, and cooperate with the guide effect of the bracket 135 for the moving reed mechanism 131, so as to improve the stability and reliability of the movement of the moving reed mechanism 131 relative to the push seat 1331, and avoid the deflection of the moving reed mechanism 131. Of course, the short-circuit ring structure can also be omitted, and the two sides of the moving reed 1311 can abut the second branch arm 1357 and the elastic element 132 respectively.

[0045] It can be understood that when the upper armature 143 is arranged on the bracket 135, for example, on the second branch arm 1357 and between the second branch arm 1357 and the moving reed 1311, if the upper armature 143 and the lower armature 1314 are in contact in the first state, in the second state, the moving reed 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, so as 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.

[0046] In the present application, the first supporting arm 1351 is in sliding fit with the moving spring mechanism 131. The two opposite sides of the lower armature 1314 can be in sliding fit with the opposite surfaces of the two first supporting arms 1351. The two opposite sides of the moving spring sheet 1311 can be in sliding fit with the two first supporting arms 1351. The moving spring sheet 1311 or the lower armature 1314 can be partially inserted into and slidably arranged on the first supporting arm 1351. As long as the first supporting arm 1351 can provide guiding and limiting actions for the movement of the moving spring mechanism 131 relative to the pushing seat 1331, the first supporting arm 1351 can be used.

[0047] In some embodiments, the bracket 135 can be directly connected to the pushing seat 1331. The moving assembly 13 can also include a fixing sheet 134 connected to the bracket 135 and the pushing seat 1331. The bracket 135 is indirectly connected to the pushing seat 1331 through the fixing sheet 134. It should be noted that, in the present application, the forming structure and forming position of the supporting surface 1362 are not limited. As long as the supporting surface 1362 can provide supporting actions for the moving assembly 13 in the path of moving towards the pushing seat 1331, some embodiments of the supporting surface 1362 formed by the pushing mechanism 133 are given below.

[0048] Please refer to FIG. 1, FIG. 2 and FIG. 3 again. In some embodiments, the supporting structure 136 is arranged around the elastic element 132 and is provided with a plurality of grooves 1361 arranged towards the moving spring mechanism 131. The plurality of grooves 1361 are sequentially and spacedly arranged along the circumference of the elastic element 132. The supporting structure 136 is located between adjacent two grooves 1361 and the part thereof towards the moving spring mechanism 131 forms the supporting surface 1362. That is, the side surfaces of the adjacent two grooves 1361 are connected through the supporting surface 1362. The plurality of grooves 1361 can avoid the structures such as the lower armature 1314. The supporting surface 1362 is opposite to the two end parts of the moving spring sheet 1311 located outside the lower armature 1314. This can adapt to the layout of the elements of the moving assembly 13 and is beneficial to reducing the consumption of the supporting structure 136 and the manufacturing cost of the moving assembly 13.

[0049] In some embodiments, the supporting structure 136 is provided with four supporting surfaces 1362. The four supporting surfaces 1362 are sequentially and spacedly arranged along the circumference of the elastic element 132 and are opposite to the one end part of the moving spring sheet 1311 located outside the upper armature 143. The uniform supporting actions provided for the two end parts of the moving spring sheet 1311 are beneficial to improving the structural reliability of the moving assembly 13.

[0050] Of course, in some other embodiments not shown in the figures, when the support structure 136 is arranged around the elastic element 132, the support structure 136 can also be formed with a support surface 1362 arranged around the elastic element 132, the support surface 1362 being substantially annular, and then the support surface 1362 can abut against the lower armature 1314 to support the moving spring mechanism 131. The support surface 1362 arranged with the annular surface achieves multi-directional contact on the moving spring mechanism 131, and can further improve the structural reliability of the moving assembly 13.

[0051] In the present application, the support structure 136 can be integrally formed with the pushing seat 1331 and the pushing rod 1332, and the pushing mechanism 133 as a whole can be made of plastic material, which is simple in manufacturing process and is conducive to reducing the manufacturing cost.

[0052] Please refer to FIG. 8 and FIG. 9, in some embodiments, the moving spring piece 1311 can include two sub-spring pieces 1312 arranged side by side and spaced apart from each other, and then 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 pieces 1312 at the same time, and the lower armature 1314 can also include two sub-armatures spaced apart from each other and connected to the two sub-spring pieces 1312 one by one. Each moving contact 1313 of the moving spring piece 1311 can be formed by the corresponding positions of the two sub-spring pieces 1312. In this way, the two sub-spring pieces 1312 can provide more stable electrical contact, reduce the poor contact caused by the wear or damage of a single spring piece, can also share the mechanical load of the moving contact 1313, reduce the stress of a single spring piece, improve the durability of the high-voltage DC relay 10, can also provide more uniform current distribution, reduce the arc phenomenon and contact resistance, and improve the electrical contact performance. Moreover, when one of the sub-spring pieces 1312 fails, the other sub-spring piece 1312 can still achieve the on-off control with the static contact 141 loop, and improve 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 piece 1311 can be an integral whole or provided with two sub-spring pieces 1312, as long as it does not affect the supporting effect of the support surface 1362 on the moving spring mechanism 131, and the details are not described herein.

[0053] In the present application, the elastic element 132 includes but is not limited to any applicable elastic component such as a spring, a compression spring, etc., and the connection arrangement and orientation arrangement between the elastic element 132 and the moving spring mechanism 131 and the pushing mechanism 133 are not limited, as long as the elastic element 132 can achieve 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.

[0054] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0055] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A high-voltage direct-current relay, comprising: an insulating cover; a static contact provided with a static contact point, the static contact being fixed relative to the insulating cover and a side of the static contact facing away from the static contact point protruding outside the insulating cover; and a moving assembly comprising a pushing mechanism, a moving spring mechanism, an elastic element and a bracket, the pushing mechanism comprising a pushing base and a pushing rod and a supporting structure connected to the pushing base, the moving spring mechanism being provided on a side of the supporting structure facing away from the pushing base and provided with a moving contact point opposite the static contact point, the moving spring mechanism being elastically connected to the pushing mechanism through the elastic element, the bracket being connected to the pushing base and slidably connected to the moving spring mechanism; the supporting structure is provided with a supporting surface spaced apart from the moving spring mechanism, the supporting surface being used to support the moving spring mechanism on a path of the moving spring mechanism moving away from the static contact point when a short-circuit current occurs to cause the moving contact point and the static contact point to be repelled. the supporting structure is provided around the elastic element, and a side of the supporting structure facing the moving spring mechanism forms the supporting surface.

2. The high-voltage DC relay according to claim 1, wherein the supporting surface is provided around the elastic element.

3. The high-voltage DC relay according to claim 2, wherein, the supporting structure is provided with a plurality of grooves provided towards the moving spring mechanism, the plurality of grooves being sequentially and spaced apart along a circumferential direction of the elastic element, and side walls of adjacent two of the grooves being connected through the supporting surface.

4. The high-voltage DC relay of claim 2, wherein, the pushing base, the pushing rod and the supporting structure are integrally formed.

5. The high-voltage DC relay of claim 1, wherein, the pushing mechanism is capable of driving the moving spring mechanism to move towards the static contact point, so that the moving assembly has a first state in which the moving contact point is just in contact with the static contact point and a second state in which the moving contact point is abutted against the static contact point by the elastic element, the moving spring mechanism is spaced apart from the supporting surface, and a distance between the moving spring mechanism and the supporting surface in the second state is smaller than that in the first state during switching from the first state to the second state.

6. The high-voltage DC relay of claim 1, wherein, 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 moving spring mechanism and the supporting surface.

7. The high-voltage DC relay according to claim 6, wherein the moving contact point is capable of being repelled relative to the static contact point under an electric repulsive force to switch from the second state to a third state, in the third state, the supporting surface abuts against the moving spring mechanism to make the moving spring mechanism relatively fixed with the pushing mechanism, and the length of the elastic element is greater than the limit compression length.

8. The high-voltage DC relay of claim 6, wherein, the moving spring mechanism comprises a relatively fixed lower armature and a moving spring sheet, and the moving contact point is provided on a side of the moving spring sheet facing the static contact point, wherein the supporting surface is opposite to the lower armature, and / or the supporting surface is opposite to the moving spring sheet.

9. The high-voltage DC relay of claim 6, wherein, the high-voltage direct-current relay further comprises an upper armature opposite to the lower armature, the upper armature and the lower armature are capable of attracting each other when the moving contact point and the static contact point are in contact, and the upper armature is provided on the bracket.

10. The high-voltage DC relay according to claim 9, wherein, ​ 11. The high-voltage DC relay of claim 9, wherein, The HVDC relay further comprises an upper armature opposite to the lower armature, the upper armature and the lower armature are capable of attracting each other when the movable contact and the fixed contact are in contact, the upper armature is arranged outside the movable assembly and is fixed opposite to the fixed contact.

12. The high-voltage DC relay of claim 10, wherein, When the upper armature is arranged on the support, in the first state, the upper armature and the lower armature are in contact, in the second state, the upper armature and the lower armature are spaced apart.

13. The high-voltage DC relay according to any one of claims 1-12, wherein, The HVDC relay further comprises a base and an electromagnetic assembly, the electromagnetic assembly and the fixed contact are arranged on the base, the pushing mechanism comprises a pushing seat connected to the fixed sheet and a pushing rod arranged on the side of the pushing seat away from the movable spring mechanism, the pushing rod is inserted into the electromagnetic assembly, the electromagnetic assembly is used to drive the pushing seat to move towards or away from the fixed contact through the pushing rod.

14. The high-voltage DC relay of claim 13, wherein, The elastic element is arranged between the pushing seat and the movable spring mechanism, and the two ends are respectively abutted against the movable spring mechanism and the pushing seat.

15. The high-voltage DC relay of claim 13, wherein, The support surface is located between the movable spring mechanism and the pushing seat and is arranged spaced apart from the movable spring mechanism and the pushing seat.

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