High-voltage direct current relay

Abstract

The present application relates to a high-voltage direct current relay (10), comprising a static contact (14) and a moving assembly (13), wherein the moving assembly (13) comprises a pushing mechanism (133), a moving spring mechanism (131), an elastic element (132), a bracket (135) and a fixing sheet (134), the moving spring mechanism (131) elastically cooperates with the pushing mechanism (133) by means of the elastic element (132), the fixing sheet (134) comprises a sheet-shaped body, and a support structure (136) and two connecting portions (1341) connected to the sheet-shaped body, the sheet-shaped body is embedded within the pushing mechanism (133), the connecting portions (1341) are connected to the sheet-shaped body and the bracket (135), the support structure (136) is formed with a support surface (1362), and the support surface (1362) is used for supporting the moving spring mechanism (131) on a path along which the moving spring mechanism (131) moves away from a static contact point (141).

Description

High-voltage direct-current relay

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 2024108324271, filed on June 25, 2024, entitled “High-voltage direct-current relay”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

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

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

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

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

[0007] an insulating cover;

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

[0009] The moving assembly comprises 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 connected with the pushing mechanism through the elastic element. The bracket is slidably connected with the moving spring mechanism. The fixed sheet comprises a sheet body, a supporting structure and a connecting part connected with the sheet body. The sheet body is embedded in the pushing mechanism. The connecting part is connected with the sheet body and the bracket. The supporting structure protrudes from one side of the pushing mechanism towards the moving spring mechanism. The supporting structure forms a supporting surface on the side thereof towards the moving spring mechanism. The supporting surface is used to support the moving spring mechanism on the path of moving away from the static contact when the short-circuit current causes the moving contact and the static contact to be separated.

[0010] 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

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the disclosed drawings.

[0012] Fig. 1 is a structural schematic diagram of a high-voltage DC relay in an initial state according to some embodiments.

[0013] Fig. 2 is a structural schematic diagram of a moving assembly in the high-voltage DC relay shown in Fig. 1.

[0014] Fig. 3 is an exploded schematic diagram of the moving assembly shown in Fig. 1.

[0015] Fig. 4 is a structural schematic diagram of the high-voltage DC relay shown in Fig. 1 in a first state.

[0016] Fig. 5 is a structural schematic diagram of the high-voltage DC relay shown in Fig. 1 in a second state.

[0017] Fig. 6 is a structural schematic diagram of the high-voltage DC relay shown in Fig. 1 in a third state. DETAILED DESCRIPTION

[0018] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0019] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0020] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be understood in a broad sense. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intervening element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intervening element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0024] 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 bounced apart by a large distance. For example, the elastic element is squeezed to an extreme compression state by the moving spring mechanism, and then the impact force is transmitted to the push seat and the electromagnetic assembly. At this time, the impact force is too large, which easily causes the electromagnetic assembly, the moving assembly, and the stationary contact to be completely separated, resulting in damage to the high-voltage DC relay, or the distance between the moving contact and the stationary contact is too far, resulting in too much heat generated by the arc phenomenon between the moving contact and the stationary contact, which burns the high-voltage DC relay, or even causes the high-voltage DC relay to explode. However, in order to increase the holding force of the electromagnetic assembly on the moving assembly to avoid the electromagnetic assembly from being separated from the stationary contact due to insufficient holding force or to reduce the bounce distance of the moving contact and the stationary contact, the traditional high-voltage DC relay usually needs to increase the number of turns of the coil, which increases the cost and volume of the electromagnetic assembly, and increases the volume and cost of the high-voltage DC relay.

[0025] Based on the above problems, the present application provides a high-voltage DC relay.

[0026] 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 the static contact points 141 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 to the circuit. When the moving contact points 1313 and the static contact points 141 are in contact, the moving contact points 1313 conduct the two static contact points 141 to make the circuit conductive, at this time, the high-voltage 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 or a lead wire to be electrically connected to the circuit, the material of the shell comprises but is not limited to an insulating material such as plastic, and the shell can isolate the static contact 14, the insulating cover 142 and the moving assembly 13 from the outside to achieve the insulation protection effect.

[0027] 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.

[0028] 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.

[0029] In some embodiments, the moving assembly 13 further includes a bracket 135 and a fixing plate 134. The fixing plate 134 is connected to the bracket 135 and the push seat 1331. The bracket 135 is indirectly connected to the push seat 1331 through the fixing plate 134 and slides in cooperation 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 both connected to the fixing plate 134. 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 slide in cooperation with the moving spring mechanism 131 on opposite sides of the moving spring mechanism 131, enabling 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 the elastic element 132 to undergo elastic deformation. 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.

[0030] Furthermore, in some embodiments, the moving component 13 has a support surface 1362, which can be disposed on a fixing plate 134 for connecting the push base 1331 and the first support arm 1351. Figure 1 shows a schematic diagram of the electromagnetic component 12 in its initial state when the support surface 1362 is disposed on the fixing plate 134. The support surface 1362 is located between the moving spring mechanism 131 and the push base 1331, and is spaced apart from the moving spring mechanism 131 and the push base 1331. The support surface 1362 can support the moving spring mechanism 131 on the path in which the moving spring mechanism 131 moves toward the push base 1331. 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] The aforementioned high-voltage DC relay 10 has a fixing plate 134 with a support surface 1362 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 ejected due to 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In some embodiments, 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. Thus, 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 to the push seat 1331 and are located on the opposite sides of the moving spring mechanism 131. Of course, when the upper armature 143 is disposed on the insulating cover 142, the upper armature 143 and the moving spring 1311 can also be spaced apart by the second arm 1357 of the bracket 135, in which case the second arm 1357 limits the extreme position of the moving spring mechanism 131 away from the push seat 1331. In any of the different forms of the support surface 1362 mentioned above, the upper armature 143 can also be disposed on the bracket 135, or on the insulating cover 142 of the stationary contact 14.

[0041] 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, in other embodiments, the short-circuit ring structure can be omitted, in which case the two sides of the moving spring 1311 can respectively abut against the second arm 1357 and the elastic element 132.

[0042] 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.

[0043] 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.

[0044] It should be noted that in this application, the formation structure and 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 its movement toward the push seat 1331. The following examples illustrate some embodiments of different formation methods of the support surface 1362 on the fixing piece 134.

[0045] Referring again to Figures 1, 2, and 3, in some embodiments, the fixing piece 134 includes a sheet-like body (not shown) and a support structure 136 integrally connected to the sheet-like body, and two connecting portions 1341. The sheet-like body is embedded in the push seat 1331. The sheet-like body may be completely located within the push seat 1331, with only the side exposed for connection with the connecting portions 1341 and the support structure 136. Alternatively, a portion of the sheet-like body may extend out of the push seat 1331 for connection with the connecting portions 1341 and the support structure 136. The two connecting portions 1341 are respectively connected to the two opposite edges of the sheet-like body and are both connected to the first support arm 1351. The support structure 136 may be bent relative to the sheet-like body toward the side where the moving spring mechanism 131 is located. The support structure 136 protrudes from the side of the push seat 1331 toward the moving spring mechanism 131, and the end face of the support structure 136 toward the moving spring mechanism 131 forms a support surface 1362. By setting the support structure 136 on a part of the integral structure of the fixing piece 134, it is beneficial to improve the connection reliability between the support structure 136 and other components in the moving assembly 13.

[0046] In this embodiment, only one support structure 136 may be provided, and the support structure 136 and the two connecting parts 1341 are respectively located on three sides of the push base 1331. In the embodiments shown in Figures 1-3, the fixing plate 134 has two support structures 136, which are integrally connected to the plate-shaped body and located on opposite sides of the elastic element 132. The line connecting the two support structures 136 is perpendicular to the projection of the line connecting the two connecting parts 1341 onto the plate-shaped body. That is, when the push base 1331 is approximately cuboid, the two support structures 136 and the two connecting parts 1341 can be located on all four sides of the push base 1331. In this embodiment, the two support structures 136 can be directly opposite the two ends of the moving spring 1311 located outside the lower armature 1314, which facilitates the rational planning of the layout of each part of the fixing plate 134, the push base 1331, and the moving spring mechanism 131, thereby improving the structural reliability and performance stability of the moving assembly 13. In this embodiment, a support structure 136 integrally formed with the sheet-like main body is separately provided on the fixing plate 134 to form a support surface 1362, which helps to reduce the deviation of the spring pitch size caused by the riveting process, improve the fitting accuracy between the components, and thus improve the performance reliability of the high voltage DC relay 10.

[0047] It is understandable that when the support surface 1362 is formed on the fixing plate 134, the fixing plate 134 as a whole can also be made of metal. Each part of the fixing plate 134 can be integrally formed, so that each part has a certain elastic deformation capability. Thus, during the process of switching from the second state to the third state, the elastic deformation capability between each part of the fixing plate 134 can buffer part of the impact of the moving spring mechanism 131, which is beneficial to reduce the holding force requirement of the electromagnetic component 12 and reduce the volume and cost of the electromagnetic component 12.

[0048] In the embodiments shown in the accompanying drawings of this application, the movable spring 1311 is a single integral spring. 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-springs fails, the other sub-spring can still control the on / off circuit with the stationary contact 141, improving the performance reliability of the high-voltage DC relay 10. Of course, in any other embodiment where the support surface 1362 is formed in other components or locations, the moving spring 1311 can be a single unit or have two sub-springs, as long as it does not affect the supporting effect of the support surface 1362 on the moving spring mechanism 131, which will not be elaborated here.

[0049] 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.

[0050] 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, The 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 is elastically engaged with the pushing mechanism through the elastic element. The bracket is slidably engaged with the moving spring mechanism. The fixing plate includes a sheet-like body and a support structure and a connecting part connected to the sheet-like body. The sheet-like body is embedded in the pushing mechanism. The connecting part connects the sheet-like body and the bracket. The support structure protrudes from the side of the pushing mechanism facing the moving spring mechanism. The side of the support structure facing the moving spring mechanism forms the support surface. The support surface is used to support the moving spring mechanism on the path of its movement 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 piece includes at least two connecting parts, 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.

3. The high-voltage DC relay according to claim 2, wherein, The fixing plate is provided with two support structures, which are located on opposite sides of the elastic element in the axial direction. The line connecting the two support structures intersects the projection of the line connecting the two connecting parts onto the plate-shaped body.

4. The high-voltage DC relay according to claim 1, wherein, The sheet-like main body, the connecting part, and the supporting structure are integrally formed.

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, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, 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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