High-voltage direct-current relay

Abstract

The present application relates to a high-voltage direct-current relay (10) comprising a stationary contact (14) and a movable assembly (13), the movable assembly (13) comprising a pushing mechanism (133), a movable spring mechanism (131), an elastic element (132), a support (135), and fixing pieces (134), wherein two ends of the elastic element (132) respectively abut against the movable spring mechanism (131) and the pushing mechanism (133), the fixing pieces (134) are connected to the pushing mechanism (133) and the support (135), and the support (135) slidably cooperates with the movable spring mechanism (131); each fixing piece (134) has a support surface (1362), the support surfaces (1362) are located between the movable spring mechanism (131) and the pushing mechanism (133), and the support surfaces (1362) can support the movable spring mechanism (131) on a path along which the movable spring mechanism (131) moves away from the stationary contact (14).

Description

High-voltage direct-current relay

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 2024108319536, 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, the current high-voltage direct-current relay, when the circuit is short-circuited or overloaded, the moving contact and the static contact will be repelled due to the electrodynamic repulsion, 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 using 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 provided with a static contact, the static contact is fixed relative to the insulating cover, and the side of the static contact away from the static contact protrudes outside the insulating cover;

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

[0010] The fixed plate is formed with a support surface which is arranged in spaced relation to the moving spring mechanism and which is used to support the moving spring mechanism on its path of movement away from the stationary contact when a short circuit current occurs causing 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 ordinary skilled in the field, other drawings can also be obtained without creative labor 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 some embodiments.

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

[0016] Fig. 4 is a structural schematic diagram of the high-voltage DC relay in a first state in some embodiments.

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

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

[0019] Fig. 7 is a structural schematic diagram of a moving assembly in other embodiments.

[0020] Fig. 8 is an exploded schematic diagram of the moving assembly in Fig. 7.

[0021] Fig. 9 is a structural schematic diagram of the moving assembly in Fig. 7 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 ordinary skilled in the field without creative labor fall within the scope of protection of the present application.

[0023] In the description of the application, it should be understood that, if there are 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, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the 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 application.

[0024] In addition, if there are these terms "first", "second", 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 indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the 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 this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, 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 this application can be understood according to the specific circumstances.

[0026] In this 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 described with respect to the orientations shown in the drawings and are merely for purposes of illustration and are not intended to be limiting.

[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 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 base 1331 and a pushing rod 1332 connected to the pushing base 1331 on the side away from 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 and a fixing piece 134, the fixing piece 134 is connected to the bracket 135 and the pushing base 1331, and the bracket 135 is indirectly connected to the pushing base 1331 through the fixing piece 134 and is 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 away from the elastic element 132 and the moving spring mechanism 131, and are connected to the fixing piece 134. 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 away from the pushing base 1331. The two first arms 1351 are in sliding fit with the moving spring mechanism 131 on the two sides away from the moving spring mechanism 131, so that the moving spring mechanism 131 moves relative to the pushing base 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 guide the movement of the moving spring mechanism 131 relative to the pushing base 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 base 1331 on the side of the moving spring mechanism 131 towards the static contact 141, thereby preventing the moving spring mechanism 131 from disengaging from the pushing base 1331 and improving the performance stability of the high-voltage DC relay 10.

[0034] Further, in some embodiments, the moving assembly 13 is formed with a support surface 1362, which can be arranged on the fixing sheet 134 connecting the pushing seat 1331 and the first supporting arm 1351. FIG. 1 shows a structural schematic diagram of the electromagnetic assembly 12 in the initial state when the support surface 1362 is arranged on the fixing sheet 134. The support surface 1362 is located between the moving spring mechanism 131 and the pushing seat 1331 and is arranged in a spaced manner with the moving spring mechanism 131 and the pushing seat 1331. The support surface 1362 can support the moving spring mechanism 131 in the path of moving the moving spring mechanism 131 towards the pushing seat 1331. 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 the state of the high-voltage DC relay 10 breaking the circuit. In the initial state, the support 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, and then drive 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. 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 to move towards the stationary contact 141 by the pushing mechanism 133 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.

[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 exerted by the elastic element 132 on 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, thereby improving the stability and reliability of the contact between the moving contact 1313 and the static contact 141, and the elastic element 132 can cooperate with the electromagnetic assembly 12 to offset the electrodynamic repulsive force between the moving contact 1313 and the static contact 141, which is conducive to reducing the holding force requirement of the high-voltage DC relay 10 on the electromagnetic assembly 12, and is conducive to reducing 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 conducive to improving 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 fixed plate 134 of the high-voltage DC relay 10 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 to which the high-voltage DC relay 10 is connected is short-circuited or overloaded, the moving contact 1313 of the moving spring mechanism 131 and the static contact 141 of the static contact head 14 are repelled by the electrodynamic repulsion force, and 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. After the moving contact 1313 and the static contact 141 are repelled, the electrodynamic repulsion force between the moving contact 1313 and the static contact 141 disappears. 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 head 14 due to excessive impact, which can cause damage to the high-voltage DC relay 10. 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 buffer of the elastic element 132 can avoid the separation of the moving assembly 13 from the static contact head 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, which can cause damage or even explosion of the high-voltage DC relay 10. Moreover, the buffer of the elastic element 132 to the moving spring mechanism 131 can also reduce the requirement of 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 whole moving assembly 13 with a 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, referring to Figs. 5 and 6 again, in some embodiments, the moving spring mechanism 131 comprises a moving spring leaf 1311 and a lower armature 1314 fixedly connected with the moving spring leaf 1311, and the high-voltage DC relay 10 further comprises an upper armature 143 opposite to the lower armature 1314, and the moving contact 1313 is arranged on the side of the moving spring leaf 1311 facing the static contact 14, and 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 leaf 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 comprises 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 conducive to reducing the holding force required by the electromagnetic assembly 12, and also conducive to reducing 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 leaf 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 supporting arm 1357, and only two first supporting arms 1351 are arranged to connect with the push base 1331 and located on the two sides away from 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 leaf 1311 can also be spaced apart by the second supporting arm 1357 of the bracket 135, and then the second supporting arm 1357 limits the limit position of the moving spring mechanism 131 away from the push base 1331. In any of the above-mentioned embodiments of different forming modes of the supporting surface 1362, the upper armature 143 can also be arranged on the bracket 135 or arranged on the insulating cover 142 of the static contact 14.

[0044] When the short circuit ring structure is provided in the high-voltage DC relay 10, the support surface 1362 can be directly opposite one of the lower armature 1314 or the moving spring piece 1311, as long as it can abut one of the upper armature 143 and the moving spring piece 1311 on the path of the moving spring mechanism 131 moving towards the push seat 1331, so as to provide a support effect for the moving spring 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 spring piece 1311 and the upper armature 143 respectively, and the support surfaces 1362 can simultaneously abut the moving spring piece 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 opposite sides of the elastic element 132, which can be directly opposite one of the moving spring piece 1311 and the upper armature 143, or directly opposite the moving spring piece 1311 and the upper armature 143 respectively. The provision of at least two opposite support surfaces 1362 in multiple positions to simultaneously provide a uniformly distributed support effect for the moving spring mechanism 131, in combination with the guiding effect of the bracket 135 for the moving spring mechanism 131, can improve the stability and reliability of the movement of the moving spring mechanism 131 relative to the push seat 1331, and avoid the deflection of the moving spring mechanism 131. Of course, in other embodiments, the short circuit ring structure can also be omitted, and the two sides of the moving spring piece 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 spring piece 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 piece 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 in sliding fit with the first supporting arm 1351. As long as the first supporting arm 1351 can provide guiding and limiting effects on the movement of the moving spring mechanism 131 relative to the push base 1331, the first supporting arm 1351 can be in sliding fit with the moving spring mechanism 131 in any way.

[0047] 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 effect on the moving assembly 13 in the path of moving towards the push base 1331. The following examples illustrate some embodiments of the different forming ways of the supporting surface 1362 on the fixed sheet 134.

[0048] Please refer to FIG. 2 and FIG. 3 again. In some embodiments, the fixed sheet 134 includes a sheet-shaped body (not labeled in the figure), a supporting structure 136 and two connecting parts 1341 integrally connected to the sheet-shaped body. The sheet-shaped body is embedded in the push base 1331. The sheet-shaped body can be completely located in the push base 1331, and only the side surface for connecting the connecting parts 1341 and the supporting structure 136 is exposed. Alternatively, part of the sheet-shaped body can protrude out of the push base 1331 for connecting the connecting parts 1341 and the supporting structure 136. The two connecting parts 1341 are respectively connected to the opposite edges of the sheet-shaped body and are connected to the first supporting arm 1351. The supporting structure 136 can be bent towards the side of the moving spring mechanism 131 relative to the sheet-shaped body. The supporting structure 136 protrudes from the side of the push base 1331 towards the moving spring mechanism 131. The end surface of the side of the supporting structure 136 towards the moving spring mechanism 131 forms the supporting surface 1362. By arranging the supporting structure 136 on one part of the integral structure of the fixed sheet 134, the connection reliability of the supporting structure 136 and other elements in the moving assembly 13 can be improved.

[0049] In the embodiment, the support structure 136 can be provided only one, and the support structure 136 and the two connecting portions 1341 are located on three sides of the push seat 1331 respectively. In the embodiment shown in FIG. 2 and FIG. 3, the fixed sheet 134 is provided with two support structures 136, and the two support structures 136 are integrally connected to the sheet-shaped body and located on two sides opposite to each other of the elastic element 132. The connecting line of the two support structures 136 is perpendicular to the projection of the connecting line of the two connecting portions 1341 on the sheet-shaped body, that is, when the push seat 1331 is substantially a square, the two support structures 136 and the two connecting portions 1341 can be located on four sides of the push seat 1331. In the embodiment, the two support structures 136 can be located opposite to the two end portions of the moving sheet 1311 outside the lower armature 1314 respectively, which is beneficial to reasonably plan the layout of each part of the fixed sheet 134, the push seat 1331 and the moving spring mechanism 131 and the like, and improve the structural reliability and performance stability of the moving assembly 13. In the embodiment, the support structure 136 is separately provided on the fixed sheet 134 and integrally formed with the sheet-shaped body to form the support surface 1362, which is beneficial to reduce the deviation of the spring distance size caused by the riveting process, improve the matching precision between the parts, and thus improve the performance reliability of the high-voltage direct-current relay 10.

[0050] Please refer to FIG. 7, FIG. 8 and FIG. 9, in some other embodiments, the fixed sheet 134 includes at least two connecting portions 1341, the at least two connecting portions 1341 are located on two sides opposite to each other of the elastic element 132 and are connected to the push seat 1331 and the bracket 135, and the support surface 1362 is formed on the at least one connecting portion 1341. In the embodiment, the connecting portion 1341 can be directly connected to the push seat 1331, or connected to the sheet-shaped body embedded in the push seat 1331, and the sheet-shaped body can be provided according to the above description.

[0051] In some embodiments, the connecting portion 1341 comprises a first connecting plate 1342 and a second connecting plate 1343 connected to each other and intersecting, the first connecting plate 1342 is connected to the pushing seat 1331, and the second connecting plate 1343 is connected to the support 135 and forms a supporting surface 1362 towards one side of the moving assembly 13. For example, the first supporting arm 1351 of the support 135 is located outside the first connecting plate 1342, the first connecting plate 1342 and the first supporting arm 1351 are substantially parallel and both are perpendicular to the extending direction of the pushing seat 1331, and the second connecting plate 1343 is substantially perpendicular to the first connecting plate 1342 and the first supporting arm 1351, that is, the first connecting plate 1342, the second connecting plate 1343 and the first supporting arm 1351 form a stepped structure, and the supporting surface 1362 corresponds to the stepped surface of the stepped structure. In this embodiment, the supporting surface 1362 can be directly opposite to the lower armature 1314, which is conducive to adapting to the layout of the support 135, the pushing seat 1331 and the moving spring mechanism 131, and reduces the difficulty and cost of setting the supporting surface 1362. In this embodiment, the supporting surface 1362 is formed on the connecting portion 1341 by designing the shape of the connecting portion 1341, which is conducive to reducing the number of parts of the moving spring mechanism 131, simplifying the forming process and consumables of the parts, and at the same time, reducing the volume of the high-voltage DC relay 10. In addition, the connecting portion 1341 is led out from the pushing seat 1331, which can prolong the arc climbing distance of the connecting portion 1341 to the base 11, thereby improving the insulation performance of the pushing mechanism 133 and the safety performance of the high-voltage DC relay 10.

[0052] It can be understood that when the supporting surface 1362 is formed on the fixed sheet 134, the fixed sheet 134 as a whole can also be made of metal material, and the parts of the fixed sheet 134 can be integrally formed, so that the parts have a certain elastic deformation capacity, so that the elastic deformation capacity between the parts of the fixed sheet 134 can buffer the impact of the moving spring mechanism 131 during the switching from the second state to the third state, which is conducive to reducing the requirement for the holding force of the electromagnetic assembly 12 and reducing the volume and cost of the electromagnetic assembly 12.

[0053] In the embodiments shown in the drawings of the present application, the moving spring 1311 is an integral spring, and in other embodiments, the moving spring 1311 can also include two sub-springs arranged side by side and spaced apart, and when the moving spring mechanism 131 is provided with a lower armature 1314, the lower armature 1314 can be connected to the two sub-springs at the same time, and the lower armature 1314 can also include two sub- armatures spaced apart, and the two sub- armatures are connected to the two sub-springs one by one. Each moving contact 1313 of the moving spring 1311 can be formed by the corresponding positions of the two sub-springs. In this way, the two sub-springs can provide more stable electrical contact, reduce poor contact caused by wear or damage of a single spring, and can also share the mechanical load of the moving contact 1313, reduce the stress of a single spring, improve the durability of the high-voltage DC relay 10, and also provide more uniform current distribution, reduce arc phenomenon and contact resistance, and improve electrical contact performance. Moreover, when one of the sub-springs fails, the other sub-spring can still achieve on-off control with the static contact 141 loop, 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 1311 can be an integral whole or provided with two sub-springs, as long as it does not affect the supporting effect of the support surface 1362 on the moving spring mechanism 131, and this will not be described here.

[0054] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present application.

[0055] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the 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 DC relay, comprising: Insulating cover; A stationary contact is provided with a stationary contact point. The stationary contact is fixed relative to the insulating cover, and the side of the stationary contact facing away from the stationary contact point protrudes outside the insulating cover. A moving assembly includes a pushing mechanism, a moving spring mechanism, an elastic element, a bracket, and a fixing plate. The moving spring mechanism has a moving contact opposite to the stationary contact. The moving spring mechanism elastically engages with the pushing mechanism via the elastic element. The fixing plate is connected to the pushing mechanism and the bracket. The bracket slides with the moving spring mechanism. The fixed plate has a support surface, which is spaced apart from the moving spring mechanism. The support surface is used to support the moving spring mechanism on the path of the moving spring mechanism moving away from the stationary contact when a short circuit current causes the moving contact and the stationary contact to spring apart.

2. The high-voltage DC relay according to claim 1, wherein, The fixing plate includes at least two connecting portions, which are located on opposite sides of the elastic element in the axial direction and are both connected to the pushing mechanism and the bracket. The supporting surface is formed on at least one of the connecting portions.

3. The high-voltage DC relay according to claim 2, wherein, The connecting part includes an integrally formed first connecting plate and a second connecting plate that intersect. The first connecting plate is connected to the pushing mechanism, and the second connecting plate is connected to the bracket. The side of the second connecting plate facing the moving component forms the support surface.

4. The high-voltage DC relay according to claim 3, wherein, At least a portion of the bracket is located outside the first connecting plate, and the first connecting plate, the second connecting plate, and a portion of the bracket form a stepped structure.

5. The high-voltage DC relay according to claim 1, wherein, The pushing mechanism can drive the moving spring mechanism to move towards the stationary contact, so that the moving component has a first state and a second state. In the first state, the moving contact is exactly in contact with the stationary contact. In the second state, the moving contact is pressed against the stationary contact by the elastic element. The moving spring mechanism is spaced apart from the support surface. During the switching from the first state to the second state, the pushing mechanism moves relative to the moving spring mechanism towards the stationary contact. The distance between the moving spring mechanism and the support surface is smaller in the second state than in the first state.

6. The high-voltage DC relay according to claim 5, wherein, In the second state, the difference between the length of the elastic element and the ultimate compression length of the elastic element is greater than the distance between the moving spring mechanism and the support surface.

7. The high-voltage DC relay according to claim 5, wherein, When a short-circuit current occurs, the moving contact can spring away from the stationary contact under the action of electric repulsion to switch from the second state to the third state. In the third state, the support surface abuts against the moving spring mechanism so that the moving spring mechanism is relatively fixed to the pushing mechanism, and the length of the elastic element is greater than the ultimate compression length of the elastic element.

8. The high-voltage DC relay according to claim 5, wherein, The moving spring mechanism includes a relatively fixed lower armature and a moving spring, the moving contact is located on the side of the moving spring facing the stationary contact, wherein the supporting surface is directly opposite the lower armature, and / or the supporting surface is directly opposite the moving spring.

9. The high-voltage DC relay according to claim 8, wherein, The high-voltage DC relay also includes an upper armature opposite to the lower armature. When the moving contact and the stationary contact are in contact, the upper armature and the lower armature can attract each other.

10. The high-voltage DC relay according to claim 9, wherein, The upper armature is mounted on the bracket.

11. The high-voltage DC relay according to claim 10, wherein, 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.

12. The high-voltage DC relay according to claim 9, wherein, The upper armature is located outside the moving component and is fixed relative to the stationary contact.

13. The high-voltage DC relay according to any one of claims 1-12, wherein, The high-voltage DC relay also includes a base and an electromagnetic assembly. The electromagnetic assembly and the stationary contact are disposed on the base. The pushing mechanism includes a pushing seat connected to the fixed plate and a pushing rod disposed on the side of the pushing seat facing away from the moving 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 stationary contact through the pushing rod.

14. The high-voltage DC relay according to claim 13, wherein, The elastic element is disposed between the push seat and the moving spring mechanism, and its two ends abut against the moving spring mechanism and the push seat, respectively.

15. The high-voltage DC relay according to claim 13, wherein, The support surface is located between the moving spring mechanism and the push seat, and is spaced apart from the moving spring mechanism and the push seat.

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