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), and a support (135), wherein the movable spring mechanism (131) elastically cooperates with the pushing mechanism (133) by means of the elastic element (132), and the support (135) is connected to the pushing mechanism (133) and slidably cooperates with the movable spring mechanism (131); the support (135) is provided with support structures (136), each support structure (136) has a support surface (1362), the support surfaces (1362) are spaced apart from the movable spring mechanism (131), and the support surfaces (1362) are used, when the generation of a short-circuit current causes a movable contact point (1313) and a stationary contact point (141) to spring apart, for supporting 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 DC relay

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2024108318209, filed on June 25, 2024, entitled "High Voltage DC Relay", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of relay technology, and in particular to a high-voltage DC relay. Background Technology

[0004] High-voltage DC relays, as a new type of automatic electrical switch, can achieve normally open or normally closed states through electromagnetic holding force. Current high-voltage DC relays typically consist of an electromagnetic component, a moving component, and a stationary contact. The moving contact on the moving spring of the moving component and the stationary contact together form the contact part of the high-voltage DC relay. The electromagnetic component includes a coil, a first iron core, and a second iron core. When the coil is energized, it magnetizes the second iron core, causing the second iron core to attract the first iron core, thus driving the moving component closer to the stationary contact until the moving contact on the moving component and the stationary contact on the stationary contact make contact, thus completing the circuit. However, current high-voltage DC relays, when a short circuit or overload occurs, will generate an electrodynamic repulsive force between the moving and stationary contacts, causing them to spring apart and resulting in arcing, leading to relay damage. In industries such as the new energy sector, which use high-voltage circuits, the demand for miniaturized and short-circuit resistant high-voltage DC relays is increasing. Summary of the Invention

[0005] According to various embodiments of this application, a high-voltage DC relay is provided.

[0006] A high-voltage DC relay, comprising:

[0007] Insulating cover;

[0008] A stationary contact, having a stationary contact point, 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; and,

[0009] The moving component includes a pushing mechanism, a moving spring mechanism, an elastic element, and a bracket. The moving spring mechanism has a moving contact opposite to the stationary contact. The moving spring mechanism is elastically engaged with the pushing mechanism through the elastic element. The bracket is connected to the pushing mechanism and is slidably engaged with the moving spring mechanism.

[0010] The bracket is provided with a support structure, the support structure forming a support surface, the support surface being spaced apart from the moving spring mechanism, the support surface being 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 occurs causing the moving contact and the stationary contact to spring apart.

[0011] Details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims.

[0012] Details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects, and advantages of the invention will become apparent from the specification, drawings, and claims. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0014] Figure 1 is a schematic diagram of the structure of the high voltage DC relay in the initial state in some embodiments.

[0015] Figure 2 is a schematic diagram of the moving component in the high-voltage DC relay shown in Figure 1.

[0016] Figure 3 is an exploded schematic diagram of the moving component in some other embodiments.

[0017] Figure 4 is a schematic diagram of the high-voltage DC relay shown in Figure 1 in the first state.

[0018] Figure 5 is a schematic diagram of the high-voltage DC relay shown in Figure 1 in the second state.

[0019] Figure 6 is a schematic diagram of the high-voltage DC relay shown in Figure 1 in the third state.

[0020] Figure 7 is a schematic diagram of the structure of a moving component without a short-circuit ring structure in some embodiments.

[0021] Figure 8 is a structural schematic diagram of the moving component shown in Figure 7 from another angle.

[0022] Figure 9 is a schematic diagram of the support structure connecting the main body of the support arm within the through hole in some embodiments.

[0023] Figure 10 is a structural schematic diagram of the moving component shown in Figure 9 from another angle.

[0024] Figure 11 is a schematic diagram of the structure connecting the two sides of the support arm body in some embodiments.

[0025] Figure 12 is a structural schematic diagram of the moving component shown in Figure 11 from another angle.

[0026] Figure 13 is a schematic diagram of the support structure connecting the two sides of the main body of the arm in some other embodiments.

[0027] Figure 14 is a structural schematic diagram of the moving component shown in Figure 13 from another angle.

[0028] Figure 15 is a schematic diagram of the structure in some embodiments where the elastic element is sleeved on the support structure.

[0029] Figure 16 is an exploded schematic diagram of the moving component shown in Figure 15.

[0030] Figure 17 is a schematic diagram of the structure in some embodiments where the second part of the first body is inclined to the support structure.

[0031] Figure 18 is a schematic diagram of the moving component shown in Figure 17.

[0032] Figure 19 is a schematic diagram of the support structure connected to the edge of the connector in some embodiments.

[0033] Figure 20 is an exploded schematic diagram of the moving component shown in Figure 19. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] As high-voltage DC relays are increasingly widely used in various fields, the industry's requirements for their heat loss resistance, short-circuit protection, and voltage resistance are also becoming more stringent. In particular, the current and voltage of circuits in which high-voltage DC relays are used are increasing. For example, in new energy vehicles, as the required driving range increases, the capacity of battery packs is also increasing, leading to higher current and voltage requirements for the high-voltage DC relays used in the battery pack circuits. Consequently, when the circuit is short-circuited or overloaded, the electrodynamic repulsion force generated between the moving and stationary contacts of the high-voltage DC relay is significant. This can easily cause the moving and stationary contacts to spring apart by a large distance. For instance, if the moving spring mechanism compresses the elastic element to its limit, the impact force is transmitted to the push base and electromagnetic assembly. Excessive impact force can cause the electromagnetic assembly, moving assembly, and stationary contact to detach entirely, damaging the high-voltage DC relay. Alternatively, if the distance between the moving and stationary contacts is too great, excessive heat generated by arcing between them can burn out the high-voltage DC relay, or even cause it to explode. However, in traditional high-voltage DC relays, to increase the holding force of the electromagnetic component on the moving component, so as to avoid the electromagnetic component being unable to hold the stationary contact due to insufficient holding force or to reduce the spring-off distance between the moving and stationary contacts, it is usually necessary to increase the number of coil windings. This leads to an increase in the cost and size of the electromagnetic component, and thus increases the size and cost of the high-voltage DC relay.

[0041] In view of the above problems, this application provides a high-voltage DC relay.

[0042] Please refer to Figures 1, 2, and 3. Figure 1 is a structural schematic diagram of the high-voltage DC relay 10 in some embodiments, Figure 2 is a structural schematic diagram of the moving component 13 in some embodiments, and Figure 3 is an exploded schematic diagram of the moving component 13 in other embodiments. In some embodiments, the high-voltage DC relay 10 includes a base 11, an electromagnetic component 12, a moving component 13, stationary contacts 14, and an insulating cover 142. The insulating cover 142 is disposed on the base 11, and the stationary contacts 14 are disposed on the insulating cover 142. There may be two stationary contacts 14, and each of the two stationary contacts 14 has a stationary contact point 141. The moving component 13 includes a moving spring mechanism 131, an elastic element 132, and a pushing mechanism 133. The moving spring mechanism 131 has two moving contacts 1313 opposite to the two stationary contacts 141. The moving spring mechanism 131 is elastically connected to the pushing mechanism 133 through the elastic element 132. The electromagnetic component 12 is mounted on the base 11 and can drive the moving component 13 to move towards or away from the stationary contact 141 via the pushing mechanism 133, so that the moving contact 1313 contacts or disengages from the stationary contact 141. It is understood that the high-voltage DC relay 10 can be used as a switching element in a circuit. The stationary contact 14 may have leads electrically connected to the two stationary contacts 141, and these leads are electrically connected to the circuit. When the moving contact 1313 contacts the stationary contact 141, the moving contact 1313 conducts through the two stationary contacts 141, thus completing the circuit. At this time, the high-voltage DC relay 10 is open. When the moving contact 1313 disengages from the stationary contact 141, the two stationary contacts 141 are electrically isolated, the circuit is broken, and the high-voltage DC relay 10 is closed. In some embodiments, the high-voltage DC relay 10 may further include a housing (not shown) covering the insulating cover 142 and the stationary contact 14. The stationary contact 14 can be led out to the outside of the housing through conductive structures such as electrodes and leads to be electrically connected to the circuit. The material of the housing includes, but is not limited to, insulating materials such as plastic. The housing can isolate the stationary contact 14, the insulating cover 142 and the moving component 13 from the outside world to achieve insulation protection.

[0043] The high-voltage DC relay 10 provided in this application helps reduce manufacturing costs and size, while effectively supporting the moving spring mechanism 131, reducing the distance between the moving contact 1313 and the stationary contact 141 to reduce heat generated by arcing, and preventing the moving component 13 and the electromagnetic component 12 from detaching from the stationary contact 14, thus avoiding damage to the high-voltage DC relay 10. The high-voltage DC relay 10 provided in this application can be used in circuits with high current, such as circuits with operating currents below 8kA. The high-voltage DC relay 10 includes, but is not limited to, applications in battery pack circuits of new energy vehicles. It can also be used as a switching element in circuits of any other suitable equipment, which will not be elaborated upon in this application.

[0044] In some embodiments, the pushing mechanism 133 includes a pushing seat 1331 and a pushing rod 1332 connected to the side of the pushing seat 1331 facing away from the moving spring mechanism 131. The electromagnetic component 12 may include 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. The upper iron core 121 is fixedly disposed on the base 11, and the lower iron core 122 and the coil may be disposed within the base 11. The pushing rod 1332 passes through the upper iron core 121 and is inserted into the lower iron core 122, and the pushing rod 1332 is slidably engaged with the upper iron core 121. When the coil is energized, it can magnetize the upper iron core 121 and the lower iron core 122, causing the upper iron core 121 and the lower iron core 122 to attract each other, causing the lower iron core 122 to move toward the upper iron core 121, thereby driving the pushing rod 1332 to drive the entire moving component 13 toward the stationary contact 141.

[0045] In some embodiments, the moving assembly 13 further includes a bracket 135, which is connected to the push seat 1331 and slidably engaged with the moving spring mechanism 131. For example, the bracket 135 may include two first arms 1351 and one second arm 1357. The two first arms 1351 are located on opposite sides of the elastic element 132 and the moving spring mechanism 131, and are directly or indirectly connected to the push seat 1331. The two ends of the second arm 1357 are connected to the two first arms 1351, and are located on the side of the moving assembly 13 away from the push seat 1331. The two first arms 1351 slidably engage with the moving spring mechanism 131 on opposite sides, allowing the moving spring mechanism 131 to move relative to the push seat 1331 in a direction closer to or farther from the stationary contact 141, thereby causing elastic deformation of the elastic element 132. The sliding limit function of the two first arms 1351 on the moving spring mechanism 131 can provide guidance for the movement of the moving spring mechanism 131 relative to the push seat 1331, thereby improving the performance stability of the high voltage DC relay 10. The second arm 1357 can limit the moving spring mechanism 131 away from the push seat 1331 on the side of the moving spring mechanism 131 facing the stationary contact 141, preventing the moving spring mechanism 131 from disengaging from the push seat 1331 and improving the performance stability of the high voltage DC relay 10.

[0046] Further, in some embodiments, the moving component 13 has a support surface 1362 formed on at least one first arm 1351. In the accompanying drawings, it is shown that both first arms 1351 have support surfaces 1362 as an example. The support surface 1362 is located between the moving spring mechanism 131 and the push seat 1331, and is spaced apart from both the moving spring mechanism 131 and the push seat 1331. The support surface 1362 can support the moving spring mechanism 131 on the path it moves away from the stationary contact 141. In some embodiments, the movement direction of the support surface 1362 away from the stationary contact 141 and towards the push seat 1331 is the same. In this application, the state in which the moving contact 1313 and the stationary contact 141 are spaced apart, and the electromagnetic component 12 does not apply force to the push rod 1332, i.e., the high-voltage DC relay 10 disconnects the circuit, is called the initial state. In the initial state, the support surface 1362 is spaced apart from the moving spring mechanism 131. When the moving contact 1313 and the stationary contact 141 need to be brought into contact to conduct the circuit, the lower iron core 122 of the electromagnetic component 12 moves towards the upper iron core 121. This, in turn, drives the pushing mechanism 133 via the pushing rod 1332, which in turn drives the moving spring mechanism 131 towards the stationary contact 141, thus giving the moving component 13 a first state and a second state. Referring to Figures 4 and 5, when the moving component 13 moves to the first state, the moving contact 1313 is 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 in the initial state. That is, during the process of the pushing mechanism 133 driving the moving spring mechanism 131 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.

[0047] After the electromagnetic component 12 drives the moving spring mechanism 131 to the first state via the pushing mechanism 133, the electromagnetic component 12 continues to drive the pushing mechanism 133 to move towards the stationary contact 141 to the second state. During the transition from the first state to the second state, since the moving contact 1313 is in contact with the stationary contact 141 and the moving contact 1313 and the stationary contact 141 are relatively fixed, and the pushing mechanism 133 continues to move towards the stationary contact 141, the distance between the pushing seat 1331 and the moving spring mechanism 131 will decrease. That is to say, during the transition 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 squeeze the elastic element 132, causing the length of the elastic element 132 to decrease and the elastic element 132 to undergo elastic deformation. It is understandable that in both the first and second states, the moving contact 1313 is in contact with the stationary contact 141. The elastic force exerted by the elastic element 132 on the moving contact 1313 is greater in the second state than in the first state. The setting of the second state allows the elastic element 132 to press the moving contact 1313 against the stationary contact 141, improving the stability and reliability of the contact between the moving contact 1313 and the stationary contact 141. At the same time, the elastic element 132 can cooperate with the electromagnetic component 12 to counteract the electric repulsion between the moving contact 1313 and the stationary contact 141, which helps to reduce the holding force requirement of the high-voltage DC relay 10 on the electromagnetic component 12, and helps to reduce the cost and volume of the electromagnetic component 12.

[0048] It is understandable that during the transition from the initial state to the first state, and during the transition from the first state to the second state, the lower iron core 122 gradually approaches the upper iron core 121. In the first state, the lower iron core 122 and the upper iron core 121 are spaced apart. In the second state, the lower iron core 122 can just make contact with the upper iron core 121, which is beneficial to enhance the magnetic attraction between the upper iron core 121 and the lower iron core 122, thereby enhancing the holding force of the electromagnetic component 12 on the moving component 13.

[0049] 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 remains spaced apart from the moving spring mechanism 131, and the distance between the moving spring mechanism 131 and the support surface 1362 is smaller in the second state than in the first state. Furthermore, the distance between the support surface 1362 and the push seat 1331 is greater than the ultimate compression length of the elastic element 132. That is, in the second state, the difference between the length of the elastic element 132 and its ultimate compression length is greater than the distance between the moving spring mechanism 131 and the support surface 1362. The length of the elastic element 132 can be equal to the distance between the moving spring mechanism 131 and the push seat 1331. Referring to Figure 6, it can be understood that when the circuit is short-circuited or overloaded, taking a current exceeding 8kA as an example, the electrodynamic repulsion between the moving contact 1313 and the stationary contact 141 is greater than the elastic force exerted by the elastic element 132 on the moving contact 1313 and the holding force of the electromagnetic component 12. The moving contact 1313 springs away from the stationary contact 141, causing the moving component 13 to move towards the push seat 1331 and further compress the elastic element 132 until the moving component 13 abuts against the support surface 1362. The support surface 1362 provides support to the moving component 13, preventing it from moving further towards the push seat 1331. In this application, the state where the support surface 1362 abuts against the moving component 13 to provide support is called the third state of the moving component 13. In the third state, the moving spring mechanism 131, the bracket 135, and the push mechanism 133 are relatively fixed, and the electromagnetic component 12 bears the impact force of the moving spring mechanism 131.

[0050] It is understandable that the support surface 1362 of the moving component 13 only contacts the moving spring mechanism 131 in the third state to provide support. In other states, the support surface 1362 will not interfere with the movement of the moving spring mechanism 131. This helps to avoid the setting of the support surface 1362 causing other types of interference to the movement of the moving spring mechanism 131, such as sliding fit or limit fit, which would increase the risk of the moving spring mechanism 131 getting stuck, uneven force, or wear and scraping. While providing support, it also helps to maintain the structural reliability of the moving component 13 and has little impact on the contact reliability of the moving component 13.

[0051] The aforementioned high-voltage DC relay 10 has a support surface 1362 formed on the bracket 135 that supports the moving spring mechanism 131 on the path of the moving spring mechanism 131 moving toward 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 stationary contact 141 of the stationary contact 14 are springed apart by electric 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 and the push mechanism 133 are relatively fixed. Since the electric repulsion between the moving contact 1313 and the stationary contact 141 disappears after the moving contact 1313 and the stationary contact 141 spring open, the elastic element 132 can effectively buffer the kinetic energy of the moving spring mechanism 131 as it moves away from the stationary contact 141 to the support surface 1362. Moreover, the elastic element 132 will not be compressed to its maximum compression length. This ensures that when the support surface 1362 supports the moving spring mechanism 131, the impact of the moving spring mechanism 131 on the pushing mechanism 133 and the electromagnetic component 12 will not be too great. This avoids damage to the high-voltage DC relay 10 caused by the moving component 13 and the electromagnetic component 12 being completely separated from the stationary contact 14 due to excessive impact. Furthermore, the support surface 1362 supports the moving spring mechanism 131 so that the moving spring mechanism 131 will no longer move away from the stationary contact 141. 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 helps to reduce the relative spring-off distance between the moving contact 1313 and the stationary contact 141. Combined with the buffer of the elastic element 132, it can prevent the moving component 13 from detaching from the stationary contact 14, so that the distance between the moving contact 1313 and the stationary contact 141 will not be too far. This helps to avoid the arcing phenomenon between the moving contact 1313 and the stationary contact 141, which generates excessive heat and causes the high voltage DC relay 10 to be damaged or even explode. Furthermore, the buffering effect of the elastic element 132 on the moving spring mechanism 131 can also reduce the holding force requirement of the moving component 13 on the electromagnetic component 12, so that the iron core of the electromagnetic component 12 can support the entire moving component 13 with a smaller holding force. This is beneficial to reducing the number of coil turns and / or the volume of the iron core of the electromagnetic component 12, which is beneficial to the miniaturization design of the high voltage DC relay 10.

[0052] Therefore, in the process of switching from the second state to the third state, the aforementioned high-voltage DC relay 10 first buffers the impact of the moving spring mechanism 131 through the elastic element 132, and then the electromagnetic component 12 bears the impact of the moving spring mechanism 131. This helps to reduce the holding force required by the electromagnetic component 12, and helps to reduce the cost and size of the electromagnetic component 12. At the same time, it can also reduce the spring-opening distance between the moving contact 1313 and the stationary contact 141, thereby reducing the heat generated by the arcing phenomenon. The high-voltage DC relay 10 can achieve the effects of small size, low cost, and high resistance to short-circuit current and voltage.

[0053] In some embodiments, the elastic element 132 is disposed between the push seat 1331 and the moving spring mechanism 131, with both ends abutting 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. This arrangement allows for a reasonable spatial layout between the moving spring mechanism 131, the elastic element 132, and the push mechanism 133, resulting in a more compact structure. This improves the space utilization efficiency of the moving assembly 13 and also helps to keep the elastic element 132 relatively far away from the contact position of the moving contact 1313 and the stationary contact 141, reducing the impact of high temperature and ablation spatter on the elastic element 132 and reducing the assembly difficulty of the elastic element 132 with other components. Understandably, 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 stationary contact 141. This also helps to reduce the impact of high temperature and ablation spatter on the support surface 1362. For example, it can prevent the distance between the support surface 1362 and the moving spring mechanism 131 from being reduced due to spatter, which would affect the switching from the second state to the third state.

[0054] In some embodiments, please refer again to Figures 5 and 6. In some embodiments, the moving spring mechanism 131 includes a moving spring 1311 and a lower armature 1314 fixedly connected to the moving spring 1311. The high voltage DC relay 10 also includes an upper armature 143 opposite to the lower armature 1314. The moving contact 1313 is located on the side of the moving spring 1311 facing the stationary contact 14. The upper armature 143 and the lower armature 1314 together form a short-circuit protection ring structure. The upper armature 143 is located on the side of the lower armature 1314 facing away from the push seat 1331. The upper armature 143 can be fixed on the bracket 135 and located on the side of the moving spring 1311 facing away from the push seat 1331. The upper armature 143 can also be provided on the stationary contact 14. For example, the high voltage DC relay 10 includes an insulating cover 142, a stationary contact 14 and an upper armature 143. The insulating cover 142 covers the moving assembly 13 and is provided on the base 11. The stationary contact 14 and the upper armature 143 are both fixedly provided on the insulating cover 142. The stationary contact 14 faces away from the moving spring mechanism 131, that is, the side facing away from the stationary contact 141 protrudes out of the outside of the insulating cover 142. When the moving contact 1313 and the stationary contact 141 come into contact, the magnetic field generated by the moving contact 1313 and the stationary 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 stationary contact 141. This helps to reduce the holding force required for the electromagnetic component 12, and also helps to reduce the cost and size of the electromagnetic component 12.

[0055] It should be noted that when the upper armature 143 is disposed on the insulating cover 142, the upper armature 143 can be disposed corresponding to the stationary contact 141 and located between the insulating cover 142 and the moving spring 1311. In this case, the upper armature 143 can also limit the moving spring mechanism 131 on the side of the moving spring mechanism 131 facing away from the push seat 1331, limiting the moving spring mechanism 131 to the extreme position away from the push seat 1331. Therefore, when the upper armature 143 is disposed on the insulating cover 142, the support 135 of the moving assembly 13 can omit the second support arm 1357, and only two first supports 1351 are provided to connect with the push seat 1331 and are located on the two sides opposite to the moving spring mechanism 131. Of course, when the upper armature 143 is mounted on the insulating cover 142, the upper armature 143 and the moving spring 1311 can also be separated by the second arm 1357 of the bracket 135, and the second arm 1357 limits the moving spring mechanism 131 to the extreme position away from the push seat 1331.

[0056] When the high-voltage DC relay 10 is equipped with a short-circuit ring structure, the support surface 1362 can be directly opposite either the lower armature 1314 or the moving spring 1311, as long as it can abut against either the upper armature 143 or the moving spring 1311 on the path of the moving spring mechanism 131 moving towards the push seat 1331, thus providing support for the moving spring mechanism 131. Of course, the moving assembly 13 can also be provided with multiple support surfaces 1362, with each support surface 1362 directly opposite the moving spring 1311 and the upper armature 143 respectively. The support surface 1362 can simultaneously abut against both the moving spring 1311 and the upper armature 143, thereby achieving a more stable and reliable support for the moving assembly 13. In some embodiments, the moving component 13 has at least two support surfaces 1362 located on opposite sides of the elastic element 132. These support surfaces 1362 can simultaneously face either the moving spring 1311 or the upper armature 143, or they can face both the moving spring 1311 and the upper armature 143 respectively. By providing at least two opposing support surfaces 1362 simultaneously at multiple positions to achieve uniformly distributed support for the moving spring mechanism 131, and in conjunction with the guiding effect of the bracket 135 on the moving spring mechanism 131, the stability and reliability of the movement of the moving spring mechanism 131 relative to the push seat 1331 can be improved, preventing the moving spring mechanism 131 from swaying. Of course, the short-circuit ring structure can also be omitted. Figures 7 and 8 illustrate the structural diagram of the moving component 13 when the short-circuit ring structure is omitted in some embodiments. The two sides of the moving spring 1311 can respectively abut against the second arm 1357 and the elastic element 132.

[0057] It is understandable that when the upper armature 143 is mounted on the bracket 135, for example, on the second arm 1357 and located between the second arm 1357 and the movable spring 1311, if the upper armature 143 and the lower armature 1314 are in contact in the first state, then in the second state, because the movable spring 1311 and the lower armature 1314 have moved a certain distance towards the push seat 1331 relative to the first state, the upper armature 143 and the lower armature 1314 are spaced apart. However, when the upper armature 143 is mounted on the insulating cover 142, if the lower armature 1314 is in contact with the upper armature 143 in the first state, then 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 may also mount an upper armature 143 via a carrier structure additionally disposed on the base 11 to fix the upper armature 143 between the insulating cover 142 and the lower armature 1314, provided that the upper armature 143 and the lower armature 1314 can attract each other in the first and second states to provide a holding force for the contact between the moving contact 1313 and the stationary contact 141.

[0058] In this application, the sliding engagement between the first arm 1351 and the moving spring mechanism 131 can be described as follows: the two opposite sides of the lower armature 1314 can be in sliding engagement with the surfaces opposite to the two first arms 1351; the two opposite sides of the moving spring 1311 can be in sliding engagement with the two first arms 1351; or a portion of the moving spring 1311 or the lower armature 1314 can be inserted into and slidably disposed on the first arm 1351, as long as the first arm 1351 can provide guidance and limiting function for the movement of the moving spring mechanism 131 relative to the push seat 1331.

[0059] In some embodiments, the first arm 1351 of the bracket 135 can be directly connected to the push seat 1331, and the moving component 13 can also include a fixing piece 134 connected to the first arm 1351 and the push seat 1331, thereby indirectly connecting the bracket 135 to the push seat 1331 through the fixing piece 134. In this application, the formation structure and formation position of the support surface 1362 are not limited, as long as it can provide support for the moving component 13 along the path of the moving component 13 moving towards the push seat 1331. The following are examples of some embodiments in which the support surface 1362 is formed on the support structure 136 of the bracket 135.

[0060] Referring again to Figures 1 and 2, in some embodiments, the first support arm 1351 includes an integrally formed first body 1352, a second body 1353, and a support structure 136. The first body 1352 is slidably engaged with the moving spring mechanism 131, the second body 1353 is connected to the pushing mechanism 133, and the support structure 136 is connected to and intersects with the first body 1352 and the second body 1353. For example, the first body 1352 and the second body 1353 may both be perpendicular to the extending direction of the moving spring 1311, and the support structure 136 may be perpendicular to the first body 1352 and the second body 1353. The first body 1352 may be located outside the second body 1353, and the first body 1352, the support structure 136, and the second body 1353 together form a stepped structure. The support structure 136 forms a support surface 1362 on the side facing the moving spring mechanism 131; in other words, the support surface 1362 corresponds to the stepped surface of the stepped structure.

[0061] Referring to Figures 9 and 10, in some embodiments, the first arm 1351 includes an arm body 1354 and a support structure 136 integrally formed and connected to the arm body 1354. At least a portion of the support structure 136 is located on the side of the arm body 1354 facing the moving spring mechanism 131 and is located between the moving spring mechanism 131 and the push seat 1331. The side of the support structure 136 facing the moving spring mechanism 131 forms a support surface 1362.

[0062] In this embodiment, the connection method between the support structure 136 and the support arm body 1354 is not limited. For example, the support arm body 1354 may have a through hole 1355, and the support structure 136 is connected to the support arm body 1354 within the through hole 1355. The support structure 136 may be formed by bending the portion of the first support arm 1351 that forms the through hole 1355 relative to the support arm body 1354 toward the side where the elastic element 132 is located. This helps to reduce the material consumption of the support structure 136 and improve the structural strength of the first support arm 1351. In some embodiments, the through hole 1355 has two opposing sidewalls in the axial direction of the elastic element 132. One sidewall is close to the moving spring mechanism 131, and the other sidewall is away from the moving spring mechanism 131. Referring to Figures 9 and 10, the support structure 136 may be connected to the sidewall of the through hole 1355 close to the moving spring mechanism 131. In some embodiments, the support structure 136 may also be connected to the sidewall of the through hole 1355 away from the moving spring mechanism 131.

[0063] In this embodiment, when the high-voltage DC relay 10 is provided with a short-circuit ring structure, the lower armature 1314 can be connected to the middle of the moving spring 1311. The two ends of the moving spring 1311 located outside the lower armature 1314 form moving contacts 1313. The support structure 136 can be opposite to the lower armature 1314, which is beneficial to adapt to the position of the lower armature 1314 and the first support arm 1351 and reduce the manufacturing difficulty of the support structure 136.

[0064] In some embodiments, when the support structure 136 is connected to the sidewall of the through hole 1355 away from the moving spring mechanism 131, the support structure 136 can be tilted axially relative to the elastic element 132, and the end of the support structure 136 away from the arm body 1354 is used to support the moving spring mechanism 131. This reduces the distance between the support surface 1362 and the moving spring mechanism 131, thereby facilitating a reduction in the distance between the moving contact 1313 and the stationary contact 141 in the third state, and reducing the heat generated by the electric arc phenomenon.

[0065] Referring to Figures 11-14, in some embodiments, the first arm 1351 may be provided with two support structures 136. The two support structures 136 are respectively connected to the two opposite edges of the arm body 1354. The support structures 136 may be formed by bending portions on both sides of the first arm 1351 relative to the arm body 1354 toward the side where the elastic element 132 is located. Referring to Figures 11 and 12, in this embodiment, the support structure 136 may be approximately perpendicular to the arm body 1354 and directly opposite the two ends of the movable spring 1311 located outside the lower armature 1314. Referring to Figures 13 and 14, the support structure 136 may also be inclined to the arm body 1354, with one end of the support structure 136 away from the arm body 1354 extending between the lower armature 1314 and the push seat 1331, and directly opposite the lower armature 1314.

[0066] It should be noted that when the support surface 1362 is formed on the support structure 136 of the first arm 1351, the support structure 136 can be integrally formed with other parts of the first arm 1351, and the first arm 1351 as a whole can be made of any applicable metal material. In this way, the support structure 136 and other parts of the first arm 1351 have a certain elastic deformation capability. When the moving spring mechanism 131 switches to the third state, the elastic deformation capability between the support structure 136 and other parts of the first arm 1351 can help buffer part of the impact force of the moving spring mechanism 131, which also helps to reduce the holding force requirement of the electromagnetic component 12.

[0067] In the embodiments shown in the accompanying drawings, the movable spring 1311 is an integral spring structure. In other embodiments, the movable spring 1311 may also include two sub-springs arranged side by side and spaced apart from each other. When the movable spring mechanism 131 is provided with a lower armature 1314, the lower armature 1314 can be connected to both sub-springs simultaneously. The lower armature 1314 may also include two spaced-apart sub-armatures, with each sub-armature corresponding to one of the two sub-springs. Each movable contact 1313 of the movable spring 1311 can be formed by the corresponding positions of the two sub-springs. With this arrangement, the two sub-springs can provide more stable electrical contact, reduce poor contact caused by wear or damage to a single spring, share the mechanical load of the movable contact 1313, reduce the stress of a single spring, improve the durability of the high-voltage DC relay 10, provide a more uniform current distribution, reduce arcing and contact resistance, and improve electrical contact performance. Furthermore, when one of the sub-reeds fails, the other sub-reed can still achieve on / off control of the circuit with the stationary contact 141, improving the performance reliability of the high-voltage DC relay 10.

[0068] In this application, the elastic element 132 is not limited to any suitable elastic component such as a spring or compression spring. The connection and orientation of the elastic element 132 with the moving spring mechanism 131 and the pushing mechanism 133 are also not limited, as long as the elastic cooperation between the moving spring mechanism 131 and the pushing mechanism 133 can be achieved, so as to buffer the moving spring mechanism 131 during the transition from the second state to the third state.

[0069] Of course, when the support surface 1362 is formed on the bracket 135, the support surface 1362 can also have other configurations. Examples of other embodiments where the support surface 1362 is formed on the bracket 135 are given below. Referring to Figures 15 and 16, in some embodiments, the bracket 135 may include a connecting body 1358 and a support structure 136. The connecting body 1358 may be connected to the push seat 1331, for example, at least partially embedded within the push seat 1331. Two first arms 1351 are connected to both ends of the connecting body 1358, and the support structure 136 is connected to the side of the connecting body 1358 facing the moving spring mechanism 131 and located between the two first arms 1351. The first arms 1351, the connecting body 1358, and the support structure 136 may be integrally formed. The support structure 136 forms the support surface 1362 on the side facing the moving spring mechanism 131, i.e., the side opposite to the connecting body 1358. The support structure 1362 can be roughly hollow cylindrical, and the support surface 1362 can be roughly annular. The support surface 1362 can be opposite to the lower armature 1314 to accommodate the spatial layout of the lower armature 1314 and the moving spring 1311. In this embodiment, the end of the elastic element 132 near the connecting body 1358 can be sleeved on the support structure 1362, which is beneficial for assembling and positioning the elastic element 132, and also helps to ensure that when the support surface 1362 supports the moving spring mechanism 131, the length of the elastic element 132 is greater than the ultimate compression length.

[0070] Please refer to Figures 17 and 18. In some embodiments, when the first support arm 1351 includes a first body 1352, a second body 1353, and a support structure 136, the portion of the first body 1352 away from the support structure 136 is the first part of the first body 1352. This first part can be approximately parallel to the second body 1353 and slide in cooperation with the moving spring mechanism 131. The portion of the first body 1352 close to and connected to the support structure 136 is the second part of the first body 1352. This second part can be inclined towards the support structure 136, as long as the support structure 136 can form a support surface 1362 located inside the first body 1352 to meet the support requirements of the moving spring mechanism 131. In this embodiment, the connection relationship between the first body 1352, the second body 1353, and the support structure 136 can be obtained by referring to the embodiments shown in Figures 1 and 2, and will not be repeated here.

[0071] Please refer to Figures 19 and 20. In some embodiments, the bracket 135 includes a connector 1358 and a support structure 136. The connector 1358 may be connected to the push seat 1331, for example, at least partially embedded in the push seat 1331. Two first arms 1351 are connected to both ends of the connector 1358. The support structure 136 is spaced apart from the first arms 1351 and connected to the edge of the connector 1358. The support structure 1351 is located on the outer side of the elastic element 132 in the axial direction. The support structure 1351 may include two connected parts that are generally inverted L-shaped. One part is connected to the connector 1358 and is generally perpendicular to the connector 1358, and the other part is connected to the connector 1358 and is generally parallel to the connector 1358. The part of the support structure 1351 parallel to the connector 1358 faces the moving spring mechanism 131, that is, the surface facing away from the connector 1358 forms a support surface 1362. In this embodiment, the support surface 1362 can be opposite to the movable spring 1311 or the lower armature 1314. Two support structures 136 can be provided, each connected to one of the opposite edges of the connecting body 1358 and located on opposite sides of the elastic element 132 in the axial direction. The line connecting the two support structures 136 can intersect, for example, be perpendicular to, the projection of the line connecting the two first arms 1351 onto the connecting body 1358, to rationally arrange the layout of each component and avoid interference between them.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by 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. as well as, A moving assembly includes a pushing mechanism, a moving spring mechanism, an elastic element, and a bracket. 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 bracket is connected to the pushing mechanism and slides with the moving spring mechanism. The bracket is provided with a support structure, the support structure forming a support surface, the support surface being spaced apart from the moving spring mechanism, the support surface being 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 occurs causing the moving contact and the stationary contact to spring apart.

2. The high-voltage DC relay according to claim 1, wherein, The bracket includes two first arms, which are located on opposite sides of the elastic element and are both connected to the pushing mechanism and slide in cooperation with the moving spring mechanism. At least one of the first arms is provided with the support structure.

3. The high-voltage DC relay according to claim 2, wherein, The first support arm includes a support arm body, and the support structure is integrally formed and connected to the support arm body. The support structure is at least partially located on the side of the support arm body facing the moving spring mechanism, and the side of the support structure facing the moving spring mechanism forms the support surface.

4. The high-voltage DC relay according to claim 3, wherein, The first arm is provided with two support structures, which are respectively connected to the two opposite edges of the arm body; Alternatively, the main body of the support arm may have a through hole, and the support structure may be connected to the main body of the support arm within the through hole.

5. The high-voltage DC relay according to claim 2, wherein, The first support arm includes a first main body and a second main body. The first main body, the second main body and the support structure are integrally formed. The first main body is slidably engaged with the moving spring mechanism. The second main body is connected to the pushing mechanism. The support structure is connected to the first main body and the second main body and intersects with the first main body and the second main body. The support structure forms the support surface on the side facing the moving spring mechanism.

6. The high-voltage DC relay according to claim 5, wherein, The first body is located outside the second body, and the first body, the supporting structure and the second body form a stepped structure.

7. The high-voltage DC relay according to claim 5, characterized in that, The first body has a first part and a second part that are connected to each other. The first part is slidably engaged with the moving spring mechanism, and the second part is connected to the support structure and inclined to the support structure. The part of the support structure facing the moving spring mechanism and located inside the first body forms the support surface.

8. The high-voltage DC relay according to claim 1, wherein, The bracket includes an integrally formed connecting body, a support structure, and two first arms. The connecting body is disposed on the push seat, and the two first arms are respectively connected to the two opposite edges of the connecting body and slide in cooperation with the moving spring mechanism. The support structure is disposed on the connecting body and located between the two first arms. The support structure protrudes from the side of the push seat facing the moving spring mechanism, and the side of the support structure facing the moving spring mechanism forms the support surface.

9. The high-voltage DC relay according to claim 8, wherein, The support structure is generally cylindrical, and one end of the elastic element is sleeved on the support structure; and / or, The support structure is roughly in the shape of a hollow cylinder to form a ring-shaped support surface.

10. The high-voltage DC relay according to claim 1, wherein, The bracket includes an integrally formed connecting body, a support structure, and two first arms. The connecting body is located on the push seat. The two first arms are respectively connected to the two opposite edges of the connecting body and slide in cooperation with the moving spring mechanism. The support structure is spaced apart from the first arms and connected to the edge of the connecting body. The support structure is located on the outer side of the elastic element in the axial direction, and the surface of the support structure facing the moving spring mechanism forms the support surface.

11. The high-voltage DC relay according to claim 10, wherein, The support structure is provided in two parts, which are respectively connected to the two opposite edges of the connecting body and are located on opposite sides of the elastic element in the circumferential direction. The line connecting the two support structures intersects the projection of the line connecting the two first arms on the connecting body.

12. 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.

13. The high-voltage DC relay according to claim 12, 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.

14. The high-voltage DC relay according to claim 12, 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.

15. The high-voltage DC relay according to claim 12, 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.

16. The high-voltage DC relay according to claim 15, 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. The upper armature is disposed on the bracket, or the upper armature is disposed outside the moving assembly and fixed relative to the stationary contact.

17. The high-voltage DC relay according to claim 16, wherein, When the upper armature is disposed on the bracket, in the first state, the upper armature and the lower armature are in contact, and in the second state, the upper armature and the lower armature are spaced apart.

18. The high-voltage DC relay according to any one of claims 1-17, 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 bracket 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 can drive the pushing seat to move towards or away from the stationary contact through the pushing rod.

19. The high-voltage DC relay according to claim 18, 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.

20. The high-voltage DC relay according to claim 18, 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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