High-voltage direct-current relay

Abstract

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a static contact and a movable assembly, and the static contact is provided with a static contact point; the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element, a support and a fixing piece, the movable spring mechanism is provided with a movable contact opposite to the static contact, the elastic element is arranged between the movable spring mechanism and the pushing mechanism, the two ends of the elastic element abut against the movable spring mechanism and the pushing mechanism respectively, the fixing piece is connected to the pushing mechanism and the support, and the support is in sliding fit with the movable spring mechanism; a supporting surface facing the movable spring mechanism is formed on the fixing sheet, the supporting surface is located between the movable spring mechanism and the pushing mechanism, the supporting surface, the movable spring mechanism and the pushing mechanism are arranged at intervals, and the supporting surface can support the movable spring mechanism on the path where the movable spring mechanism moves away from the static contact. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to a high-voltage direct current relay. Background Art

[0002] As a new type of electric automatic switch, the high-voltage DC relay can achieve a normally open state or a normally closed state through electromagnetic holding force. The current high-voltage DC relay usually includes an electromagnetic component, a moving component and a static contact. The moving contact set on the moving reed of the moving component and the static contact set on the static contact together serve as 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, the second iron core can be magnetized so that the second iron core and the first iron core attract each other, thereby driving the moving component close to the static contact until the moving contact on the moving component and the static contact on the static contact contact to achieve the conduction of the circuit. However, in the current high-voltage DC relay, when a short circuit or overload occurs in the circuit, the moving contact and the static contact will bounce apart due to the electric repulsion, and an arcing phenomenon will occur between the moving contact and the static contact, causing damage to the relay. In industries that use high-voltage circuits such as the new energy industry, the demand for miniaturization and short-circuit resistance of high-voltage DC relays is increasing. Summary of the invention

[0003] Based on this, it is necessary to provide a high-voltage DC relay to address the problem that the high-voltage DC relay is easily damaged due to arcing during a short circuit.

[0004] A high voltage DC relay, comprising:

[0005] Insulation cover;

[0006] A stationary contactor is provided with a stationary contact point, the stationary contactor is fixed relative to the insulating cover, and a side of the stationary contactor facing away from the stationary contact point protrudes out of the outside of the insulating cover;

[0007] A dynamic assembly, comprising a pushing mechanism, a dynamic spring mechanism, an elastic element, a bracket and a fixing plate, wherein the dynamic spring mechanism is provided with a dynamic contact opposite to the static contact, the dynamic spring mechanism is elastically matched with the pushing mechanism through the elastic element, the fixing plate is connected to the pushing mechanism and the bracket, and the bracket is slidably matched with the dynamic spring mechanism; and,

[0008] The fixing plate is formed with a supporting surface, and the supporting surface is spaced apart from the dynamic spring mechanism. The supporting surface is used to support the dynamic spring mechanism on a path where the dynamic spring mechanism moves away from the static contact when a short circuit current occurs and causes the dynamic contact and the static contact to bounce apart.

[0009] In the above-mentioned high-voltage DC relay, the fixing plate is formed with a support surface that can support the moving spring mechanism on the path where the moving spring mechanism moves away from the static contact. When the circuit connected to the high-voltage DC relay is short-circuited or overloaded, the moving contact of the moving spring mechanism and the static contact of the static contact are ejected due to the electric repulsion, and the moving spring mechanism can first compress the elastic element until the support surface supports the moving spring mechanism so that the moving spring mechanism and the pushing mechanism are relatively fixed. Since the electric repulsion between the moving contact and the static contact disappears after the moving contact and the static contact are ejected, the elastic element can effectively buffer the kinetic energy of the moving spring mechanism in the process of the moving spring mechanism moving away from the static contact to the support surface, and the elastic element will not be compressed to the limit compression length, so that when the support surface supports the moving spring mechanism, the impact of the moving spring mechanism on the pushing mechanism will not be too large, thereby avoiding the damage of the high-voltage DC relay caused by the moving component being separated from the static contact as a whole due to excessive impact. Furthermore, the support of the dynamic spring mechanism by the support surface prevents the dynamic spring mechanism from moving away from the static contact any further, and the distance between the dynamic spring mechanism and the pushing mechanism is still greater than the limit compression length of the elastic element, which is beneficial to reducing the relative distance between the dynamic contact and the static contact, and the buffering of the elastic element can prevent the dynamic component from being separated from the static contact, so that the distance between the dynamic contact and the static contact will not be too far, thereby helping to avoid the arcing phenomenon between the dynamic contact and the static contact to generate excessive heat and cause damage or even explosion of the high-voltage DC relay. Furthermore, the buffering of the dynamic spring mechanism by the elastic element can also reduce the holding force requirement of the dynamic component on the electromagnetic component, so that the iron core of the electromagnetic component can support the entire dynamic component with a smaller holding force, thereby helping to reduce the number of turns of the coil winding of the electromagnetic component and / or the volume of the iron core, thereby facilitating the miniaturization design of the high-voltage DC relay.

[0010] In one embodiment, the fixing plate includes at least two connecting parts, at least two of the connecting parts are located on opposite sides of the elastic element in the axial direction, and are both connected to the pushing mechanism and the bracket, and the supporting surface is formed on at least one of the connecting parts.

[0011] In one embodiment, the connecting portion includes a first connecting plate and a second connecting plate that are integrally formed and intersecting, the first connecting plate is connected to the pushing mechanism, the second connecting plate is connected to the bracket, and the second connecting plate forms the supporting surface on a side facing the moving component.

[0012] In one embodiment, at least a portion of the bracket is located outside the first connecting plate, and the first connecting plate, the second connecting plate and a portion of the bracket form a step structure.

[0013] In one embodiment, the pushing mechanism can drive the dynamic spring mechanism to move in a direction close to the static contact, so that the dynamic component has a first state and a second state. In the first state, the dynamic contact is just in contact with the static contact. In the second state, the dynamic contact is pressed against the static contact by the elastic element, and the dynamic spring mechanism is spaced apart from the support surface. In the process of switching from the first state to the second state, the pushing mechanism moves relative to the dynamic spring mechanism in a direction close to the static contact, and the distance between the dynamic spring mechanism and the support surface in the second state is smaller than that in the first state.

[0014] In one of the embodiments, 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 dynamic spring mechanism and the supporting surface.

[0015] In one of the embodiments, when a short circuit current occurs, the moving contact can bounce away from the static contact under the action of the electric repulsive force to switch from the second state to the third state. In the third state, the supporting surface abuts against the dynamic spring mechanism so that the dynamic spring mechanism and the pushing mechanism are relatively fixed, and the length of the elastic element is greater than the limit compression length of the elastic element.

[0016] In one embodiment, the movable spring mechanism includes a relatively fixed lower armature and a movable spring piece, and the movable contact is arranged on the side of the movable spring piece facing the static contact, wherein the support surface is opposite to the lower armature, and / or the support surface is opposite to the movable spring piece.

[0017] In one embodiment, the high-voltage DC relay also includes an upper armature opposite to the lower armature, and when the moving contact and the static contact are in contact, the upper armature and the lower armature can attract each other; wherein, the upper armature is arranged on the bracket, or, the upper armature is arranged outside the moving component and is fixed relative to the static contact.

[0018] In one of the embodiments, when the upper armature is disposed on the bracket, in the first state, the upper armature is in contact with the lower armature, and in the second state, the upper armature is spaced apart from the lower armature.

[0019] In one embodiment, the high-voltage DC relay also includes a base and an electromagnetic assembly, the electromagnetic assembly and the static contact are arranged on the base, the pushing mechanism includes a pushing seat connected to the fixed plate and a pushing rod arranged on the side of the pushing seat facing away from the dynamic spring mechanism, the pushing rod is inserted into the electromagnetic assembly, and the electromagnetic assembly is used to drive the pushing seat to move toward or away from the static contact through the pushing rod.

[0020] In one embodiment, the elastic element is disposed between the pushing seat and the dynamic spring mechanism, and two ends thereof are respectively in contact with the dynamic spring mechanism and the pushing seat.

[0021] In one embodiment, the support surface is located between the dynamic spring mechanism and the pushing seat, and is spaced apart from the dynamic spring mechanism and the pushing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of a high-voltage DC relay in an initial state in some embodiments.

[0023] Figure 2 Schematic diagram of the structure of the dynamic component in some embodiments.

[0024] Figure 3 Schematic diagram of an exploded view of a moving component in some embodiments.

[0025] Figure 4 for Figure 1 The structure diagram of the high-voltage DC relay shown in the first state.

[0026] Figure 5 for Figure 1 The structure diagram of the high-voltage DC relay shown in the second state.

[0027] Figure 6 for Figure 1 The structural schematic diagram of the high-voltage DC relay in the third state is shown.

[0028] Figure 7 Schematic diagram of the structure of the dynamic components in other embodiments.

[0029] Figure 8 for Figure 7 An exploded schematic diagram of the dynamic component is shown.

[0030] Fig. 9 for Figure 7 A schematic structural diagram of the moving component from another angle is shown.

[0031] Reference numerals:

[0032] 10. High-voltage DC relay; 11. Base; 12. Electromagnetic assembly; 121. Upper iron core; 122. Lower iron core; 13. Moving assembly; 131. Moving spring mechanism; 1311. Moving spring sheet; 1313. Moving contact; 1314. Lower armature; 132. Elastic element; 133. Pushing mechanism; 1331. Pushing seat; 1332. Pushing rod; 134. Fixing plate; 1341. Connecting part; 1342. First connecting plate; 1343. Second connecting plate; 135. Bracket; 1351. First arm; 1357. Second arm; 136. Support structure; 1362. Support surface; 14. Stationary contact; 141. Stationary contact; 142. Insulating cover; 143. Upper armature. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0035] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, 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 implementation method.

[0039] As high-voltage DC relays are increasingly used in equipment in various fields, the industry's requirements for high-voltage DC relays' resistance to heat loss, short-circuit circuits, and voltages are becoming increasingly higher. Among them, the current and voltage of the circuits used by high-voltage DC relays are getting higher and higher. For example, in new energy vehicles and other equipment, as the requirements for the range of new energy vehicles are raised, the capacity of the battery packs of new energy vehicles is also getting higher and higher, and the current and voltage faced by high-voltage DC relays used in battery pack circuits are also getting higher and higher. Therefore, when the circuit is short-circuited or overloaded, the electric repulsion generated by the moving contact and the static contact of the high-voltage DC relay is large, and it is easy to bounce the moving contact and the static contact away from each other for a large distance. For example, the dynamic spring mechanism squeezes the elastic element to the limit compression state, and then transmits the impact force to the push seat and the electromagnetic assembly. At this time, the impact force is too large, which is easy to cause the electromagnetic assembly, the moving assembly and the static contact to separate as a whole, resulting in damage to the high-voltage DC relay, or the moving contact and the static contact are too far apart, resulting in the arc phenomenon between the moving contact and the static contact, which generates too much heat and burns the high-voltage DC relay, and even causes the high-voltage DC relay to explode. However, in traditional high-voltage DC relays, if the holding force of the electromagnetic component on the moving component is to be improved to avoid the electromagnetic component from being separated from the static contact due to insufficient holding force or to reduce the bounce distance between the moving contact and the static contact, it is usually necessary to increase the number of turns of the coil, resulting in an increase in the cost and volume of the electromagnetic component, which increases the volume and cost of the high-voltage DC relay.

[0040] Based on the above problems, the present application provides a high voltage DC relay.

[0041] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 is a schematic diagram of the structure of a high voltage DC relay 10 in some embodiments, Figure 2 is a schematic diagram of the structure of the moving component 13 in some embodiments, Figure 31 is an exploded schematic diagram of the moving assembly 13 in other embodiments. In some embodiments, the high-voltage DC relay 10 includes a base 11, an electromagnetic assembly 12, a moving assembly 13, a static contact 14 and an insulating cover 142. The insulating cover 142 is arranged on the base 11, and the static contact 14 is arranged on the insulating cover 142. There may be two static contacts 14, and both of the two static contacts 14 are provided with a static contact 141. The moving assembly 13 includes a moving spring mechanism 131, an elastic element 132 and a pushing mechanism 133. The moving spring mechanism 131 is provided with two moving contacts 1313 opposite to the two static contacts 141, and the moving spring mechanism 131 is elastically connected to the pushing mechanism 133 through the elastic element 132. The electromagnetic assembly 12 is arranged on the base 11, and can drive the moving assembly 13 as a whole to move in a direction close to or away from the static contact 141 through the pushing mechanism 133, so that the moving contact 1313 contacts the static contact 141, or the moving contact 1313 is separated from the static contact 141. It can be understood that the high-voltage DC relay 10 can be applied to the circuit as a switching element, and the static contact 14 can be provided with a lead-out end electrically connected to the two static contacts 141, and the lead-out end is electrically connected to the circuit. When the moving contact 1313 and the static contact 141 are in contact, the moving contact 1313 conducts the two static contacts 141 to make the circuit conductive, and the high-voltage DC relay 10 is turned on at this time. When the moving contact 1313 is separated from the static contact 141, the two static contacts 141 are electrically isolated, and the circuit is disconnected, and the high-voltage DC relay 10 is closed at this time. In some embodiments, the high-voltage DC relay 10 may also include a housing (not shown) covering the insulating cover 142 and the static contact 14, and the static 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 plastics, and the housing can isolate the static contact 14, the insulating cover 142 and the moving component 13 from the outside to achieve insulation protection.

[0042] The high-voltage DC relay 10 provided in the present application is conducive to reducing the manufacturing cost and compressing the volume. At the same time, it can effectively support the dynamic spring mechanism 131, reduce the distance between the dynamic contact 1313 and the static contact 141 to reduce the heat generated by the arc phenomenon, and avoid the dynamic component 13 and the electromagnetic component 12 from being separated from the static contact 14, which may cause damage to the high-voltage DC relay 10. The high-voltage DC relay 10 provided in the present application can be used in circuits with higher currents, such as circuits with an operating current of less than 8kA. The high-voltage DC relay 10 includes but is not limited to the battery pack circuit for new energy vehicles. The high-voltage DC relay 10 can also be used in the circuits of any other applicable equipment as a switching element, which will not be described in detail in the present application.

[0043] In some embodiments, the pushing mechanism 133 includes a pushing seat 1331 and a pushing rod 1332 connected to the pushing seat 1331 on the side facing away from the dynamic spring mechanism 131. The electromagnetic assembly 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 arranged on the base 11, and the lower iron core 122 and the coil may be arranged in the base 11. The pushing rod 1332 passes through the upper iron core 121 and is inserted into the lower iron core 122. The pushing rod 1332 is slidably matched with the upper iron core 121. When the coil is energized, the upper iron core 121 and the lower iron core 122 can be magnetized, so that the upper iron core 121 and the lower iron core 122 attract each other and the lower iron core 122 moves toward the direction close to the upper iron core 121, thereby driving the pushing rod 1332 to drive the dynamic assembly 13 as a whole to move toward the direction close to the static contact 141.

[0044] 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 pushing seat 1331, the bracket 135 is indirectly connected to the pushing seat 1331 through the fixing plate 134 and is slidably matched with the moving spring mechanism 131. For example, the bracket 135 may include two first arms 1351 and a second arm 1357, the two first arms 1351 are respectively located on the two 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 respectively connected to the two first arms 1351, and are located on the side of the moving assembly 13 that is away from the pushing seat 1331. The two first arms 1351 are slidably matched with the moving spring mechanism 131 on the opposite sides of the moving spring mechanism 131, so that the moving spring mechanism 131 can move relative to the pushing seat 1331 in the direction of approaching or moving away from the static contact 141, thereby causing the elastic element 132 to undergo elastic deformation. The sliding limit of the two first arms 1351 on the movable spring mechanism 131 can provide a guiding effect for the movement of the movable spring mechanism 131 relative to the pushing seat 1331, thereby improving the performance stability of the high-voltage DC relay 10. The second arm 1357 can limit the extreme position of the movable spring mechanism 131 away from the pushing seat 1331 on the side of the movable spring mechanism 131 facing the static contact 141, thereby preventing the movable spring mechanism 131 from separating from the pushing seat 1331, thereby improving the performance stability of the high-voltage DC relay 10.

[0045] Furthermore, in some embodiments, the moving assembly 13 is formed with a support surface 1362, and the support surface 1362 can be provided on the fixing plate 134 for connecting the pushing seat 1331 and the first arm 1351. Figure 1The schematic diagram of the structure of the electromagnetic assembly 12 in the initial state when the support surface 1362 is disposed on the fixed plate 134 is shown. The support surface 1362 is located between the dynamic spring mechanism 131 and the push seat 1331, and is spaced apart from the dynamic spring mechanism 131 and the push seat 1331. The support surface 1362 can support the dynamic spring mechanism 131 on the path where the dynamic spring mechanism 131 moves toward the push seat 1331. In the present application, the dynamic contact 1313 and the static contact 141 are spaced apart, and the electromagnetic assembly 12 does not apply a force to the push rod 1332, that is, the state in which 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 dynamic 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 assembly 12 moves toward the direction close to the upper iron core 121, and the pushing mechanism 133 driven by the pushing rod 1332 can drive the moving spring mechanism 131 to move toward the direction close to the stationary contact 141, so that the moving assembly 13 has a first state and a second state. Figure 4 and Figure 5 As shown, when the moving assembly 13 moves to the first state, the moving contact 1313 just contacts the static 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 the length in the initial state. That is, in the process in which the pushing mechanism 133 drives the moving spring mechanism 131 to move toward the direction close to the static 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.

[0046] After the electromagnetic assembly 12 drives the dynamic spring mechanism 131 to move to the first state through the pushing mechanism 133, the electromagnetic assembly 12 continues to drive the pushing mechanism 133 to move to the second state in the direction close to the static contact 141. In the process of switching from the first state to the second state, since the dynamic contact 1313 is in contact with the static contact 141, the dynamic contact 1313 and the static contact 141 are relatively fixed, and the pushing mechanism 133 continues to move in the direction close to the static contact 141, which will cause the distance between the pushing seat 1331 and the dynamic spring mechanism 131 to decrease. In other words, in the process of switching from the first state to the second state, the dynamic spring mechanism 131 and the pushing seat 1331 are relatively close, and the dynamic spring mechanism 131 and the pushing seat 1331 will squeeze the elastic element 132, so that the length of the elastic element 132 is reduced, and the elastic element 132 undergoes elastic deformation. It can be understood that in the first state and the second state, the moving contact 1313 is in contact with the static contact 141, and the elastic force applied by the elastic element 132 to the moving contact 1313 in the second state is greater than that in the first state. The setting of the second state enables the elastic element 132 to press the moving contact 1313 against the static contact 141, thereby improving the stability and reliability of the contact between the moving contact 1313 and the static contact 141. At the same time, the elastic element 132 can cooperate with the electromagnetic component 12 to offset the electric repulsion between the moving contact 1313 and the static contact 141, which is beneficial to reducing the holding force requirement of the high-voltage DC relay 10 on the electromagnetic component 12, and is beneficial to reducing the cost and volume of the electromagnetic component 12.

[0047] It can be understood that in the process of switching from the initial state to the first state, and in the process of switching from the first state to the second state, the lower iron core 122 gradually approaches the upper iron core 121, and in the first state, the lower iron core 122 is spaced apart from the upper iron core 121, and in the second state, the lower iron core 122 can just 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.

[0048] In some embodiments, the position of the support surface 1362 between the push seat 1331 and the dynamic spring mechanism 131 is designed so that in the second state, the support surface 1362 is still spaced apart from the dynamic spring mechanism 131, and the distance between the dynamic spring mechanism 131 and the support surface 1362 in the second state is smaller than that in the first state. In addition, 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 the ultimate compression length of the elastic element 132 is greater than the distance between the dynamic spring mechanism 131 and the support surface 1362, and the length of the elastic element 132 can be equal to the distance between the dynamic spring mechanism 131 and the push seat 1331. Figure 6As shown, it can be understood that when the circuit is short-circuited or overloaded, taking the current exceeding 8kA as an example, the electromotive repulsive force between the moving contact 1313 and the static contact 141 is greater than the elastic force applied by the elastic element 132 to the moving contact 1313 and the holding force of the electromagnetic assembly 12, and the moving contact 1313 and the static contact 141 are bounced apart, so that the moving assembly 13 moves toward the direction close to the push seat 1331, and further squeezes the elastic element 132, until the moving assembly 13 abuts the support surface 1362, and the support surface 1362 provides support for the moving assembly 13, so that the moving assembly 13 can no longer move toward the direction close to the push seat 1331 relative to the push seat 1331. In this application, the state in which the support surface 1362 abuts against the moving assembly 13 to provide support for the moving assembly 13 is referred to as the third state of the moving assembly 13. In the third state, the moving spring mechanism 131, the bracket 135 and the pushing mechanism 133 are relatively fixed, and the electromagnetic assembly 12 bears the impact force of the moving spring mechanism 131.

[0049] It can be understood that the support surface 1362 of the movable component 13 is in contact with the dynamic spring mechanism 131 to achieve the supporting effect only in the third state. In other states, the support surface 1362 will not interfere with the movement of the dynamic spring mechanism 131, which is conducive to avoiding the setting of the support surface 1362 to cause other types of interference with the movement of the dynamic spring mechanism 131 such as sliding fit, limit fit, etc., thereby increasing the risk of the dynamic spring mechanism 131 getting stuck, uneven force or wear and scraping. While achieving the supporting effect, it is also conducive to maintaining the structural reliability of the movable component 13, and has little impact on the contact reliability of the movable component 13.

[0050] In the above-mentioned high-voltage DC relay 10, the fixing plate 134 is formed with a supporting surface 1362 that can support the dynamic spring mechanism 131 on the path where the dynamic spring mechanism 131 moves toward the pushing mechanism 133. When the circuit connected to the high-voltage DC relay 10 is short-circuited or overloaded, the moving contact 1313 of the dynamic spring mechanism 131 and the static contact 141 of the static contact 14 are bounced apart due to the electric repulsion force, and the dynamic spring mechanism 131 can first compress the elastic element 132 until the supporting surface 1362 supports the dynamic spring mechanism 131 so that the dynamic spring mechanism 131 and the pushing mechanism 133 are relatively fixed. After the moving contact 1313 and the stationary contact 141 bounce apart, the electric repulsive force between the moving contact 1313 and the stationary contact 141 disappears. When the moving spring mechanism 131 moves toward the supporting surface 1362 away from the stationary contact 141, the elastic element 132 can effectively buffer the kinetic energy of the moving spring mechanism 131, and the elastic element 132 will not be compressed to the limit compression length, so that when the supporting surface 1362 supports the moving spring mechanism 131, the impact of the moving spring mechanism 131 on the pushing mechanism 133 and the electromagnetic assembly 12 will not be too large, thereby preventing the moving assembly 13 and the electromagnetic assembly 12 from being separated from the stationary contact 14 as a whole due to excessive impact, thereby damaging the high-voltage DC relay 10. In addition, the support of the supporting surface 1362 on the dynamic spring mechanism 131 prevents the dynamic spring mechanism 131 from moving further away from the static contact 141, and the distance between the dynamic spring mechanism 131 and the pushing seat 1331 is still greater than the maximum compression length of the elastic element 132, which is beneficial to reducing the relative bounce distance between the dynamic contact 1313 and the static contact 141. The buffering of the elastic element 132 can prevent the dynamic component 13 from separating from the static contact 14, so that the distance between the dynamic contact 1313 and the static contact 141 will not be too far, which is beneficial to avoid the arcing phenomenon between the dynamic contact 1313 and the static contact 141 to generate excessive heat and cause damage or even explosion of the high-voltage DC relay 10. Furthermore, the buffering of the dynamic spring mechanism 131 by the elastic element 132 can also reduce the holding force requirement of the dynamic component 13 on the electromagnetic component 12, so that the iron core of the electromagnetic component 12 can support the entire dynamic component 13 with a smaller holding force, thereby helping to reduce the number of coil winding turns and / or the volume of the iron core of the electromagnetic component 12, thereby facilitating the miniaturization design of the high-voltage DC relay 10.

[0051] In some embodiments, the elastic element 132 is disposed between the push seat 1331 and the dynamic spring mechanism 131, and the two ends thereof are respectively in contact with the dynamic spring mechanism 131 and the push seat 1331, and the two ends of the elastic element 132 can be respectively connected to the dynamic spring mechanism 131 and the push seat 1331. With such an arrangement, the spatial layout between the dynamic spring mechanism 131, the elastic element 132 and the push seat 133 can be rationally planned, making the structure more compact, which is beneficial to improving the space utilization efficiency of the dynamic assembly 13, and also beneficial to making the elastic element 132 relatively far away from the contact position of the dynamic contact 1313 and the static contact 141, reducing the influence of high temperature and ablation splashes on the elastic element 132, and reducing the difficulty of assembling the elastic element 132 with other components. It can be understood that when the support surface 1362 is located between the dynamic spring mechanism 131 and the push seat 1331, the support surface 1362 is farther away from the contact position of the moving contact 1313 and the static contact 141, which is also beneficial to reduce the influence of high temperature and ablation splashes on the support surface 1362, for example, avoiding the distance between the support surface 1362 and the dynamic spring mechanism 131 being reduced due to splashes, which affects the switching from the second state to the third state.

[0052] Therefore, in the process of switching from the second state to the third state, the above-mentioned high-voltage DC relay 10 first buffers the impact of the dynamic spring mechanism 131 through the elastic element 132, and then bears the impact of the dynamic spring mechanism 131 through the electromagnetic component 12, which is conducive to reducing the demand for the holding force of the electromagnetic component 12, and is conducive to reducing the cost and volume of the electromagnetic component 12. At the same time, it can also reduce the bounce distance between the moving contact 1313 and the static contact 141, thereby reducing the heat generated by the arc phenomenon. The high-voltage DC relay 10 can take into account the effects of small size, low cost and high resistance to short-circuit current and voltage.

[0053] In some embodiments, see Figure 5 and Figure 6As shown, in some embodiments, the movable spring mechanism 131 includes a movable spring piece 1311 and a lower armature 1314 fixedly connected to the movable spring piece 1311, the high-voltage DC relay 10 also includes an upper armature 143 opposite to the lower armature 1314, the movable contact 1313 is arranged on the side of the movable spring piece 1311 facing the static contact 14, the upper armature 143 and the lower armature 1314 together form an anti-short-circuit ring structure, and 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 piece 1311 facing away from the push seat 1331. The upper armature 143 can also be arranged on the static contact 14. For example, the high-voltage DC relay 10 includes an insulating cover 142, a static contact 14 and an upper armature 143. The insulating cover 142 is arranged on the moving component 13 and on the base 11. The static contact 14 and the upper armature 143 are both fixedly arranged on the insulating cover 142. The static contact 14 faces away from the moving spring mechanism 131, that is, the side facing away from the static contact 141 protrudes out of the outside of the insulating cover 142. When the moving contact 1313 and the stationary contact 141 are in 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, and can provide a holding force for the moving contact 1313 and the stationary contact 141, which is beneficial to reduce the holding force required for the electromagnetic assembly 12, and is also beneficial to reduce the cost and volume of the electromagnetic assembly 12.

[0054] 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 static contact 141 and located between the insulating cover 142 and the movable spring piece 1311, and the upper armature 143 can also limit the movable spring mechanism 131 on the side of the movable spring mechanism 131 facing away from the push seat 1331, and limit the limit position of the movable spring mechanism 131 away from the push seat 1331. Therefore, when the upper armature 143 is disposed on the insulating cover 142, the bracket 135 of the movable assembly 13 can omit the second arm 1357, and only two first arms 1351 are provided to connect with the push seat 1331 and are located on the opposite sides of the movable spring mechanism 131. Of course, when the upper armature 143 is disposed on the insulating cover 142, the upper armature 143 and the movable spring piece 1311 may also be spaced apart by the second arm 1357 of the bracket 135, and the second arm 1357 limits the limit position of the movable spring mechanism 131 away from the push seat 1331. In any embodiment of the above-mentioned different formation methods of the support surface 1362, the upper armature 143 may also be disposed on the bracket 135, or on the insulating cover 142 of the stationary contact 14.

[0055] When the high-voltage DC relay 10 is provided with a short-circuit ring structure, the support surface 1362 can be directly opposite to one of the lower armature 1314 or the movable spring piece 1311, as long as it can abut against one of the upper armature 143 and the movable spring piece 1311 on the path where the movable spring mechanism 131 moves toward the push seat 1331 to provide support for the movable spring mechanism 131. Of course, the moving assembly 13 can also be provided with a plurality of support surfaces 1362, and the plurality of support surfaces 1362 are directly opposite to the movable spring piece 1311 and the upper armature 143 respectively, and the support surface 1362 can abut against the movable spring piece 1311 and the upper armature 143 at the same time, so as to achieve a more stable and reliable support for the moving assembly 13. In some embodiments, the moving assembly 13 is formed with at least two supporting surfaces 1362, and the at least two supporting surfaces 1362 are located on opposite sides of the elastic element 132. The at least two supporting surfaces 1362 can be directly opposite to one of the moving spring piece 1311 and the upper armature 143 at the same time, or can be directly opposite to the moving spring piece 1311 and the upper armature 143 respectively. The at least two opposing supporting surfaces 1362 are provided to achieve uniformly distributed support for the moving spring mechanism 131 at multiple positions at the same time, and the guiding effect of the bracket 135 on the moving spring mechanism 131 can improve the stability and reliability of the movement of the moving spring mechanism 131 relative to the push seat 1331, and avoid the deflection of the moving spring mechanism 131. Of course, in other embodiments, the short-circuit ring structure can also be omitted, and the two sides of the moving spring piece 131 can be respectively abutted against the second arm 1357 and the elastic element 132.

[0056] It is understandable that when the upper armature 143 is disposed on the bracket 135, for example, disposed on the second arm 1357 and located between the second arm 1357 and the movable spring piece 1311, if in the first state, the upper armature 143 and the lower armature 1314 are in contact, then in the second state, since the movable spring piece 1311 and the lower armature 1314 as a whole move a certain distance toward the push seat 1331 relative to the first state, the upper armature 143 and the lower armature 1314 are spaced apart. When the upper armature 143 is disposed on the insulating cover 142, if in the first state, the lower armature 1314 is in contact with the upper armature 143, then in the second state, the upper armature 143 and the lower armature 1314 are also spaced apart from each other. In other embodiments, the high-voltage DC relay 10 can also install the upper armature 143 through a carrier structure additionally arranged on the base 11 to fix the upper armature 143 between the insulating cover 142 and the lower armature 1314. As long as in the first state and the second state, the upper armature 143 and the lower armature 1314 can attract each other to provide a retaining force for the contact between the moving contact 1313 and the static contact 141.

[0057] In the present application, the first arm 1351 is described as slidingly cooperating with the movable spring mechanism 131. The two opposite sides of the lower armature 1314 may be slidingly cooperating with the opposite surfaces of the two first arms 1351, or the two opposite sides of the movable spring piece 1311 may be slidingly cooperating with the two first arms 1351, or the movable spring piece 1311 or part of the lower armature 1314 may be inserted into and slidably disposed on the first arm 1351, as long as the first arm 1351 can provide guiding and limiting effects on the movement of the movable spring mechanism 131 relative to the push seat 1331.

[0058] It should be noted that, in the present 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 on the path of the moving component 13 moving toward the pushing seat 1331. The following examples illustrate some embodiments of different formation methods of the support surface 1362 on the fixing plate 134.

[0059] Please see again Figure 2 and Figure 3 As shown, in some embodiments, the fixing sheet 134 includes a sheet-like body (not shown), a support structure 136 integrally connected to the sheet-like body, and two connecting parts 1341. The sheet-like body is embedded in the pushing seat 1331. The sheet-like body can be completely located in the pushing seat 1331, with only the side surface for connecting with the connecting part 1341 and the support structure 136 exposed. Alternatively, part of the sheet-like body can extend out of the pushing seat 1331 for connecting with the connecting part 1341 and the support structure 136. The two connecting parts 1341 are respectively connected to two opposite edges of the sheet-like body and are both connected to the first arm 1351. The support structure 136 can be formed by bending relative to the sheet-like body toward the side where the dynamic spring mechanism 131 is located. The support structure 136 protrudes from the side of the pushing seat 1331 facing the dynamic spring mechanism 131, and the end surface of the support structure 136 facing the dynamic spring mechanism 131 forms a support surface 1362. The support structure 136 is provided through a part of the integral structure of the fixing plate 134 , which is helpful to improve the connection reliability between the support structure 136 and other components in the dynamic component 13 .

[0060] In this embodiment, only one supporting structure 136 is provided, and the supporting structure 136 and the two connecting portions 1341 are respectively located on three sides of the pushing seat 1331. Figure 2 and Figure 3In the illustrated embodiment, the fixing sheet 134 is provided with two supporting structures 136, which are integrally connected to the sheet-like body and are located on opposite sides of the elastic element 132. The line connecting the two supporting structures 136 and the projection of the line connecting the two connecting portions 1341 on the sheet-like body are perpendicular, that is, when the pushing seat 1331 is roughly a cube, the two supporting structures 136 and the two connecting portions 1341 can be located on the four sides of the pushing seat 1331. In this embodiment, the two supporting structures 136 can be respectively opposite to the two ends of the movable spring sheet 1311 located outside the lower armature 1314, which is conducive to the reasonable planning of the layout of various components such as the parts of the fixing sheet 134, the pushing seat 1331 and the movable spring mechanism 131, and improve the structural reliability and performance stability of the movable assembly 13. In this embodiment, a support structure 136 integrally formed with the sheet-like body is separately provided on the fixing plate 134 to form a support surface 1362, which is beneficial to reduce the deviation of the spring distance size caused by the riveting process and improve the matching accuracy between the components, thereby improving the performance reliability of the high-voltage DC relay 10.

[0061] See also Figure 7 , Figure 8 and Fig. 9 As shown, in other embodiments, the fixing sheet 134 includes at least two connecting portions 1341, and the at least two connecting portions 1341 are located on opposite sides of the elastic element 132 and are both connected to the pushing seat 1331 and the bracket 135, and the supporting surface 1362 is formed on at least one of the connecting portions 1341. In this embodiment, the connecting portion 1341 can be directly connected to the pushing seat 1331, or connected to a sheet-like body embedded in the pushing seat 1331, and the arrangement of the sheet-like body can be obtained by referring to the above description.

[0062] In some embodiments, the connecting portion 1341 includes a first connecting plate 1342 and a second connecting plate 1343 that are connected and intersecting with each other, the first connecting plate 1342 is connected to the pushing seat 1331, the second connecting plate 1343 is connected to the bracket 135, and the second connecting plate 1343 forms a supporting surface 1362 on the side facing the moving component 13. For example, the first arm 1351 of the bracket 135 is located on the outer side of the first connecting plate 1342, the first connecting plate 1342 and the first arm 1351 are substantially parallel and perpendicular to the extension direction of the pushing seat 1331, and the second connecting plate 1343 is substantially perpendicular to the first connecting plate 1342 and the first arm 1351, that is, the first connecting plate 1342, the second connecting plate 1343 and the first arm 1351 form a step structure, and the supporting surface 1362 corresponds to the step surface of the step structure. In this embodiment, the support surface 1362 can be directly opposite to the lower armature 1314, which is conducive to adapting to the layout between the bracket 135, the push seat 1331 and the dynamic spring mechanism 131, and reducing the difficulty and cost of setting the support surface 1362. In this embodiment, by designing the shape of the connecting portion 1341 to form the support surface 1362 on the connecting portion 1341, it is conducive to reducing the number of parts of the dynamic spring mechanism 131, simplifying the molding process and consumables of the parts, and at the same time, it is conducive to reducing the volume of the high-voltage DC relay 10. In addition, the connecting portion 1341 is led out from the push seat 1331, which can extend the arc creepage distance from the connecting portion 1341 to the base 11, thereby improving the insulation performance of the push mechanism 133, which is conducive to improving the safety performance of the high-voltage DC relay 10.

[0063] It can be understood 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 material, and the various parts of the fixing plate 134 can be integrally formed so that each part has a certain elastic deformation ability. Therefore, in the process of switching from the second state to the third state, the elastic deformation ability between the various parts of the fixing plate 134 can buffer part of the impact of the dynamic spring mechanism 131, which is beneficial to reduce the holding force requirements for the electromagnetic component 12 and reduce the volume and cost of the electromagnetic component 12.

[0064] In the embodiments shown in the drawings of the present application, the movable spring piece 1311 is an integral spring piece, while in other embodiments, the movable spring piece 1311 may also include two sub-spring pieces arranged in parallel and spaced from each other. When the movable spring mechanism 131 is provided with a lower armature 1314, the lower armature 1314 may be connected to the two sub-spring pieces at the same time, and the lower armature 1314 may also include two sub-armatures spaced from each other, and the two sub-armatures are connected to the two sub-spring pieces one by one. Each movable contact 1313 of the movable spring piece 1311 may be formed by the corresponding positions of the two sub-spring pieces. In this arrangement, the two sub-spring pieces can provide a more stable electrical contact, reduce the poor contact caused by wear or damage of a single spring piece, and can also share the mechanical load of the movable contact 1313, reduce the stress of a single spring piece, improve the durability of the high-voltage DC relay 10, and 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 realize the on-off control of the circuit with the static contact 141, thereby improving the performance reliability of the high-voltage DC relay 10. Of course, in any other embodiment in which the support surface 1362 is formed on other components or positions, the moving reed 1311 can be a whole, or two sub-reeds can be provided, as long as the supporting effect of the support surface 1362 on the moving spring mechanism 131 is not affected, and no further details are given here.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A high voltage DC relay, characterized in that: include: Insulation cover; A stationary contactor is provided with a stationary contact point, the stationary contactor is fixed relative to the insulating cover, and a side of the stationary contactor facing away from the stationary contact point protrudes out of the outside of the insulating cover; A dynamic assembly, comprising a pushing mechanism, a dynamic spring mechanism, an elastic element, a bracket and a fixing plate, wherein the dynamic spring mechanism is provided with a dynamic contact opposite to the static contact, the dynamic spring mechanism is elastically matched with the pushing mechanism through the elastic element, the fixing plate is connected to the pushing mechanism and the bracket, and the bracket is slidably matched with the dynamic spring mechanism; and, The fixing plate is formed with a supporting surface, and the supporting surface is spaced apart from the dynamic spring mechanism. The supporting surface is used to support the dynamic spring mechanism on a path where the dynamic spring mechanism moves away from the static contact when a short circuit current occurs and causes the dynamic contact and the static contact to bounce apart.

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

3. The high voltage DC relay according to claim 2, characterized in that: The connecting portion includes a first connecting plate and a second connecting plate that are integrally formed and intersecting, the first connecting plate is connected to the pushing mechanism, the second connecting plate is connected to the bracket, and the second connecting plate forms the supporting surface on a side facing the moving component.

4. The high voltage DC relay according to claim 3, characterized in that: At least a portion of the bracket is located outside the first connecting plate, and the first connecting plate, the second connecting plate and a portion of the bracket form a step structure.

5. The high voltage DC relay according to claim 1, characterized in that: The pushing mechanism can drive the moving spring mechanism to move in a direction approaching the static contact, so that the moving component has a first state and a second state. In the first state, the moving contact is just in contact with the static contact. In the second state, the moving contact is pressed against the static contact by the elastic element. The moving spring mechanism is spaced apart from the supporting surface. In the process of switching from the first state to the second state, the pushing mechanism moves relative to the moving spring mechanism in a direction approaching the static contact. The distance between the moving spring mechanism and the supporting surface in the second state is smaller than that in the first state.

6. The high voltage DC relay according to claim 5, characterized in that: In the second state, the difference between the length of the elastic element and the limit compression length of the elastic element is greater than the distance between the dynamic spring mechanism and the supporting surface.

7. The high voltage DC relay according to claim 5, characterized in that: When a short circuit current occurs, the moving contact can bounce away from the static contact under the action of the electric repulsive force to switch from the second state to the third state. In the third state, the supporting surface abuts against the dynamic spring mechanism so that the dynamic spring mechanism and the pushing mechanism are relatively fixed, and the length of the elastic element is greater than the limit compression length of the elastic element.

8. The high voltage DC relay according to claim 5, characterized in that: The movable spring mechanism comprises a relatively fixed lower armature and a movable spring piece, the movable contact is arranged on the side of the movable spring piece facing the static contact, wherein the supporting surface is opposite to the lower armature, and / or the supporting surface is opposite to the movable spring piece.

9. The high voltage DC relay according to claim 8, characterized in that: The high-voltage DC relay also includes an upper armature opposite to the lower armature, and when the moving contact and the static contact are in contact, the upper armature and the lower armature can attract each other; wherein, the upper armature is arranged on the bracket, or the upper armature is arranged outside the moving component and fixed relative to the static contact.

10. The high voltage DC relay according to claim 9, characterized in that: When the upper armature is disposed on the bracket, in the first state, the upper armature is in contact with the lower armature, and in the second state, the upper armature is spaced apart from the lower armature.

11. The high voltage DC relay according to any one of claims 1 to 10, characterized in that: The high-voltage DC relay also includes a base and an electromagnetic assembly, the electromagnetic assembly and the static contact are arranged on the base, the pushing mechanism includes a pushing seat connected to the fixing plate and a pushing rod arranged on the side of the pushing seat facing away from the dynamic spring mechanism, the pushing rod is inserted into the electromagnetic assembly, and the electromagnetic assembly is used to drive the pushing seat to move toward or away from the static contact through the pushing rod.

12. The high voltage DC relay according to claim 11, characterized in that: The elastic element is arranged between the pushing seat and the dynamic spring mechanism, and two ends of the elastic element are respectively in contact with the dynamic spring mechanism and the pushing seat.

13. The high voltage DC relay according to claim 11, characterized in that: The supporting surface is located between the dynamic spring mechanism and the pushing seat, and is spaced apart from the dynamic spring mechanism and the pushing seat.

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