High-voltage direct-current relay
By designing the supporting structure and elastic components of the fixing plate in a high-voltage DC relay, the problem of damage caused by arc pulling during short circuit is solved, and the effect of miniaturization and anti-short circuit is achieved, and damage caused by heat generated by arc phenomenon is avoided.
Patent Information
- Application Number
- CN202421469940.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-25
AI Technical Summary
High-voltage DC relays are easily damaged by arc pulling when short circuits are short circuited, and in high-voltage circuit applications such as the new energy industry, the demand for miniaturization and short circuit resistance is increasing.
A high-voltage DC relay is designed, and a support structure of a fixed piece is used to form a support surface. Through the elastic cooperation between the elastic element and the pushing mechanism, the movement of the spring mechanism during a short circuit is supported, and the kinetic energy of the spring mechanism is buffered to avoid damage caused by excessive impact.
The arc pulling phenomenon between the dynamic contacts and the static contacts is effectively avoided, the heat generated by the arc phenomenon is reduced, the relay damage or explosion is avoided, and the retention force requirements of the electromagnetic components are reduced, realizing the miniaturization design of the relay.
Smart Images
Figure CN222927402U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of relays, and particularly to a high-voltage DC relay. Background Art
[0002] As a new type of electric automatic switch, a high-voltage DC relay can achieve a normally open state or a normally closed state through electromagnetic holding force. Currently, a high-voltage DC relay generally includes an electromagnetic component, a moving component, and a static contact. The moving contact provided on the moving reed of the moving component and the static contact provided 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, causing the second iron core to attract the first iron core, thereby driving the moving component closer to the static contact until the moving contact on the moving component contacts the static contact on the static contact, realizing 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 off due to the electric repulsive force, and an arcing phenomenon will occur between the moving contact and the static contact, resulting in damage to the relay. In industries such as the new energy industry that use high-voltage circuits, the demand for miniaturization and short-circuit resistance of high-voltage DC relays is increasing day by day. Summary of the Invention
[0003] Based on this, in view of the problem that the high-voltage DC relay is easily damaged due to the arcing phenomenon during a short circuit, it is necessary to provide a high-voltage DC relay.
[0004] A high-voltage DC relay includes:
[0005] An insulating cover;
[0006] A static contact provided with a static contact. The static contact is fixed relative to the insulating cover, and the side of the static contact facing away from the static contact protrudes outside the insulating cover; and,
[0007] A moving component, including a pushing mechanism, a moving reed mechanism, an elastic element, a bracket, and a fixing piece. The moving reed mechanism is provided with a moving contact opposite to the static contact. The moving reed mechanism is elastically matched with the pushing mechanism through the elastic element. The bracket is slidably matched with the moving reed mechanism. The fixing piece includes a sheet-like main body, a support structure, and a connecting portion connected to the sheet-like main body. The sheet-like main body is embedded in the pushing mechanism. The connecting portion is connected to the sheet-like main body and the bracket. The support structure protrudes from the side of the pushing mechanism facing the moving reed mechanism. A support surface is formed on the side of the support structure facing the moving reed mechanism. The support surface is used to support the moving reed mechanism on the path of the moving reed mechanism moving away from the static contact when a short-circuit current occurs and causes the moving contact and the static contact to bounce off.
[0008] For the above-mentioned high-voltage DC relay, the support structure of the fixing piece 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 bounce off due to the electro-dynamic repulsive force. 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 is relatively fixed to the pushing mechanism. Since the electro-dynamic repulsive force between the moving contact and the static contact disappears after the moving contact and the static contact bounce off, during the process of the moving spring mechanism moving away from the static contact to the support surface, the elastic element can effectively buffer the kinetic energy of the moving spring mechanism, and the elastic element will not be compressed to the limit compression length. 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, avoiding damage to the high-voltage DC relay caused by excessive impact, which may lead to the overall detachment of the moving component from the static contact. Moreover, the support of the support surface for the moving spring mechanism makes the moving spring mechanism no longer continue to move away from the static contact, and the distance between the moving spring mechanism and the pushing mechanism is still greater than the limit compression length of the elastic element, which is beneficial to reducing the relatively bouncing distance between the moving contact and the static contact. Cooperating with the buffering of the elastic element can avoid the design of the moving component detaching from the static contact, so that the distance between the moving contact and the static contact will not be too far, which is beneficial to avoiding the generation of excessive heat due to the arcing phenomenon between the moving contact and the static contact, resulting in damage or even explosion of the high-voltage DC relay. In addition, the buffering of the elastic element for the moving spring mechanism can also reduce the requirement for the holding force of the moving component on the electromagnetic component, enabling the iron core of the electromagnetic component to support the entire moving component with a smaller holding force, which is beneficial to reducing the number of turns of the coil winding of the electromagnetic component and / or the volume of the iron core, thus facilitating the miniaturization design of the high-voltage DC relay.
[0009] In one embodiment, the fixing piece includes at least two connecting portions, and at least two of the connecting portions are located on opposite sides of the elastic element in the axial direction and are both connected to the pushing mechanism and the bracket.
[0010] In one embodiment, the fixing piece is provided with two of the support structures, and the two support structures are located on opposite sides of the elastic element in the axial direction, and the projection of the connection line of the two support structures on the sheet-like main body intersects with the connection line of the two connecting portions.
[0011] In one embodiment, the sheet-like main body, the connecting portion, and the support structure are integrally formed.
[0012] In one embodiment, the pushing mechanism is capable of driving the moving spring mechanism to move towards the static contact, so that the moving component has a first state and a second state. In the first state, the moving contact just contacts the static contact. In the second state, the moving contact is pressed against the static contact by the elastic element, and the moving spring mechanism is spaced apart from the support surface. During the process of switching from the first state to the second state, the pushing mechanism moves towards the static contact relative to the moving spring mechanism, and the distance between the moving spring mechanism and the support surface in the second state is smaller than that in the first state.
[0013] In one embodiment, 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.
[0014] In one embodiment, when a short-circuit current occurs, the moving contact can bounce relative to the static contact under the action of the electro-dynamic repulsion force 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 and the pushing mechanism are relatively fixed, and the length of the elastic element is greater than the ultimate compression length of the elastic element.
[0015] In one embodiment, the moving spring mechanism includes a relatively fixed lower armature and a moving spring piece, and the moving contact is arranged on the side of the moving spring piece facing the static contact. Wherein, the support surface faces the lower armature, and / or the support surface faces the moving spring piece.
[0016] In one embodiment, the high-voltage DC relay further includes an upper armature opposite to the lower armature. 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 relatively fixed to the static contact.
[0017] In one embodiment, when the upper armature is arranged on the bracket, in the first state, the upper armature and the lower armature are in contact, and in the second state, the upper armature and the lower armature are spaced apart.
[0018] In one embodiment, the high-voltage DC relay further includes a base and an electromagnetic component. The electromagnetic component and the static contact are arranged on the base. The pushing mechanism includes a pushing seat connected to the fixing piece and a pushing rod arranged on the side of the pushing seat facing away from the moving spring mechanism. The pushing rod is inserted into the electromagnetic component, and the electromagnetic component is used to drive the pushing seat to move towards or away from the static contact through the pushing rod.
[0019] In one embodiment, the elastic element is disposed between the pushing seat and the moving spring mechanism, and both ends thereof are respectively abutted against the moving spring mechanism and the pushing seat.
[0020] In one embodiment, the supporting surface is located between the moving spring mechanism and the pushing seat, and is spaced apart from the moving spring mechanism and the pushing seat. Description of the Drawings
[0021] Figure 1 FIG. is a schematic structural diagram of a high-voltage DC relay in an initial state in some embodiments.
[0022] Figure 2 is Figure 1 a schematic structural diagram of a moving component in the high-voltage DC relay shown.
[0023] Figure 3 is Figure 1 an exploded schematic diagram of the moving component shown.
[0024] Figure 4 is Figure 1 a schematic structural diagram of the high-voltage DC relay shown in a first state.
[0025] Figure 5 is Figure 1 a schematic structural diagram of the high-voltage DC relay shown in a second state.
[0026] Figure 6 is Figure 1 a schematic structural diagram of the high-voltage DC relay shown in a third state.
[0027] Reference Numerals:
[0028] 10. High-voltage DC relay; 11. Base; 12. Electromagnetic component; 121. Upper iron core; 122. Lower iron core; 13. Moving component; 131. Moving spring mechanism; 1311. Moving spring piece; 1313. Moving contact; 1314. Lower armature; 132. Elastic element; 133. Pushing mechanism; 1331. Pushing seat; 1332. Pushing rod; 134. Fixed piece; 1341. Connecting portion; 1342. First connecting plate; 1343. Second connecting plate; 135. Bracket; 1351. First arm; 1357. Second arm; 136. Supporting structure; 1362. Supporting surface; 14. Static contact; 141. Static contact point; 142. Insulating cover; 143. Upper armature. Detailed Description of the Embodiments
[0029] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. A lot of specific details are set forth in the following description 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 departing from the spirit of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.
[0030] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0031] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0032] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "coupled", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0033] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.
[0034] 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 also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.
[0035] With the increasingly widespread application of high-voltage DC relays in equipment in various fields, the industry's requirements for the anti-thermal loss, anti-short-circuit circuit and voltage of high-voltage DC relays are also getting higher and higher. Among them, the current and voltage of the circuits in which high-voltage DC relays are applied are getting higher and higher. For example, in equipment such as new energy vehicles, as the requirement for the cruising range of new energy vehicles increases, the capacity of the battery packs of new energy vehicles is also getting higher and higher, and the current and voltage faced by the high-voltage DC relays applied to the battery pack circuits are also getting higher and higher. Thus, when the circuit is short-circuited or overloaded, the electro-dynamic repulsive force generated by the moving contact and the static contact of the high-voltage DC relay is relatively large, and it is easy to bounce the moving contact and the static contact apart by a large distance. For example, the moving spring mechanism squeezes the elastic element to the extreme compression state, and then conducts the impact force to the pushing seat and the electromagnetic component. At this time, the impact force is too large, which is easy to cause the electromagnetic component, the moving component and the static contact to be separated as a whole, resulting in the damage of the high-voltage DC relay, or the distance between the moving contact and the static contact bounces too far, resulting in excessive heat generation due to the arc phenomenon between the moving contact and the static contact, burning out the high-voltage DC relay, or even causing the high-voltage DC relay to explode. However, for traditional high-voltage DC relays, if we want to improve the holding force of the electromagnetic component on the moving component to avoid the separation of the electromagnetic component due to insufficient holding force from the static contact or reduce the bouncing distance between the moving contact and the static contact, we usually need to increase the number of turns of the coil winding, resulting in an increase in the cost and volume of the electromagnetic component, and increasing the volume and cost of the high-voltage DC relay.
[0036] Based on the above problems, this application provides a high-voltage DC relay.
[0037] Please refer to Figure 1, Figure 2 and Figure 3 , Figure 1 is a schematic structural view of the high-voltage DC relay 10 in some embodiments, Figure 2 is a schematic structural view of the moving component 13 in some embodiments, Figure 3 is an exploded view of the moving component 13 in other embodiments. In some embodiments, the high-voltage DC relay 10 includes a base 11, an electromagnetic component 12, a moving component 13, a static contact 14, and an insulating cover 142. The insulating cover 142 is disposed on the base 11, and the static contact 14 is disposed on the insulating cover 142. There may be two static contacts 14, and both of the two static contacts 14 are provided with static contact points 141. The moving component 13 includes a moving spring mechanism 131, an elastic element 132, and a pushing mechanism 133. The moving spring mechanism 131 is provided with two moving contact points 1313 opposite to the two static contact points 141. The moving spring mechanism 131 is elastically connected to the pushing mechanism 133 through the elastic element 132. The electromagnetic component 12 is disposed on the base 11 and can drive the entire moving component 13 to move in a direction close to or away from the static contact point 141 through the pushing mechanism 133, so that the moving contact point 1313 contacts the static contact point 141, or the moving contact point 1313 is separated from the static contact point 141. It can be understood that the high-voltage DC relay 10 can be applied to a circuit as a switching element. The static contact 14 may be provided with lead-out ends electrically connected to the two static contact points 141, and the lead-out ends are electrically connected to the circuit. When the moving contact point 1313 and the static contact point 141 are in contact, the moving contact point 1313 conducts the two static contact points 141 to make the circuit conductive. At this time, the high-voltage DC relay 10 is opened. When the moving contact point 1313 is separated from the static contact point 141, the two static contact points 141 are electrically isolated and the circuit is disconnected. At this time, the high-voltage DC relay 10 is closed. In some embodiments, the high-voltage DC relay 10 may further include a housing (not shown in the figure) covering the insulating cover 142 and the static contact 14. 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. The housing can isolate the static contact 14, the insulating cover 142, and the moving component 13 from the outside world to achieve the function of insulation protection.
[0038] The high-voltage DC relay 10 provided by the present application is beneficial to reducing the manufacturing cost and compressing the volume. At the same time, it can effectively support the moving spring mechanism 131, reduce the distance between the moving contact point 1313 and the static contact point 141 to reduce the heat generated by the arc phenomenon, and avoid damage to the high-voltage DC relay 10 caused by the separation of the moving component 13 and the electromagnetic component 12 from the static contact 14. The high-voltage DC relay 10 provided by the present application can be used in circuits with relatively high currents, such as circuits with a working current within 8 kA. The high-voltage DC relay 10 includes but is not limited to being used in the battery pack circuit of new energy vehicles. The high-voltage DC relay 10 can also be used in the circuits of other any applicable devices as a switching element, which will not be elaborated in this application.
[0039] 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 assembly 12 may include an upper iron core 121, a lower iron core 122, and a coil disposed 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 both 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, 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, causing the lower iron core 122 to move in a direction closer to the upper iron core 121, thereby driving the pushing rod 1332 to drive the moving assembly 13 as a whole to move in a direction closer to the static contact 141.
[0040] In some embodiments, the moving assembly 13 further includes a bracket 135 and a fixing piece 134. The fixing piece 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 piece 134 and is slidably engaged 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 opposite sides of the elastic element 132 and the moving spring mechanism 131, and are both connected to the fixing piece 134. The two ends of the second arm 1357 are respectively connected to the two first arms 1351 and are located on the side of the moving assembly 13 facing away from the pushing seat 1331. The two first arms 1351 are slidably engaged with the moving spring mechanism 131 on opposite sides of the moving spring mechanism 131, which can enable the moving spring mechanism 131 to move relative to the pushing seat 1331 in a direction closer to or 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 moving spring mechanism 131 can provide a guiding effect for the movement of the moving spring mechanism 131 relative to the pushing seat 1331, improving the performance stability of the high-voltage DC relay 10. The second arm 1357 can define the limit position of the moving spring mechanism 131 away from the pushing seat 1331 on the side of the moving spring mechanism 131 facing the static contact 141, preventing the moving spring mechanism 131 from detaching from the pushing seat 1331 and improving the performance stability of the high-voltage DC relay 10.
[0041] Further, in some embodiments, the moving assembly 13 is formed with a support surface 1362, and the support surface 1362 may be disposed on the fixing piece 134 for connecting the pushing seat 1331 and the first arm 1351. Figure 1The schematic structural diagram of the electromagnetic assembly 12 in the initial state when the support surface 1362 is provided on the fixed piece 134 is shown. The support surface 1362 is located between the moving spring mechanism 131 and the pushing seat 1331, and is arranged at an interval from the moving spring mechanism 131 and the pushing seat 1331. The support surface 1362 can support the moving spring mechanism 131 on the path of the moving spring mechanism 131 moving towards the pushing seat 1331. In this application, the state where the moving contact 1313 and the static contact 141 are spaced apart and the electromagnetic assembly 12 does not apply a force to the pushing rod 1332, that is, the state where 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 it is necessary to bring the moving contact 1313 and the static contact 141 into contact to conduct the circuit, the lower iron core 122 of the electromagnetic assembly 12 moves towards the upper iron core 121, and can drive the pushing mechanism 133 driven by the pushing rod 1332, and then drive the moving spring mechanism 131 to move towards the static contact 141, so that the moving assembly 13 has a first state and a second state. Combining 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 to say, in the process of the pushing mechanism 133 driving the moving spring mechanism 131 to move towards 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.
[0042] After the electromagnetic assembly 12 drives the moving spring mechanism 131 to move to the first state through the pushing mechanism 133, the electromagnetic assembly 12 continues to drive the pushing mechanism 133 to move towards the static contact 141 to the second state. During the process of switching from the first state to the second state, since the moving contact 1313 is in contact with the static contact 141 and the moving contact 1313 and the static contact 141 are relatively fixed, and the pushing mechanism 133 continues to move towards the static contact 141, the distance between the pushing seat 1331 and the moving spring mechanism 131 will decrease. That is to say, during the process of switching from the first state to the second state, the moving spring mechanism 131 and the pushing seat 1331 are relatively close to each other, 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 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 is greater in the second state than in the first state. The setting of the second state enables the elastic element 132 to press the moving contact 1313 tightly against the static contact 141, 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 assembly 12 to offset the electric repulsive force 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 for the electromagnetic assembly 12 and is beneficial to reducing the cost and volume of the electromagnetic assembly 12.
[0043] It can be understood that during the process of switching from the initial state to the first state and during 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 be in contact with the upper iron core 121, which is beneficial to improving the magnetic attraction between the upper iron core 121 and the lower iron core 122, thereby improving the holding force of the electromagnetic assembly 12 on the moving assembly 13.
[0044] In some embodiments, by designing the position of the support surface 1362 between the pushing seat 1331 and the moving spring mechanism 131, in the second state, the support surface 1362 still 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. And the distance between the support surface 1362 and the pushing seat 1331 is greater than the ultimate compression length of the elastic element 132. That is to say, 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 moving spring mechanism 131 and the support surface 1362, and the length of the elastic element 132 can be equal to the distance between the moving spring mechanism 131 and the pushing seat 1331. Combined with Figure 6As shown, it can be understood that when the circuit is short-circuited or overloaded, taking the current exceeding 8 kA as an example, the electro-dynamic repulsive force between the moving contact 1313 and the static contact 141 is greater than the elastic force exerted on the moving contact 1313 by the elastic element 132 and the holding force of the electromagnetic assembly 12. The moving contact 1313 and the static contact 141 bounce off, causing the moving assembly 13 to move in the direction close to the pushing seat 1331 and further compress the elastic element 132 until the moving assembly 13 abuts against the support surface 1362. The support surface 1362 provides a supporting effect on the moving assembly 13, making the moving assembly 13 unable to move relative to the pushing seat 1331 in the direction close to the pushing seat 1331. In this application, the state where the support surface 1362 abuts against the moving assembly 13 to provide a supporting effect on 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.
[0045] It can be understood that the support surface 1362 of the moving assembly 13 only contacts the moving spring mechanism 131 in the third state to achieve the supporting effect. In other states, the support surface 1362 will not interfere with the movement of the moving spring mechanism 131, which is beneficial to avoiding other types of interference such as sliding fit and limit fit between the support surface 1362 and the movement of the moving spring mechanism 131, increasing risks such as jamming, uneven force, or wear and chip generation of the moving spring mechanism 131. While achieving the supporting effect, it is also beneficial to maintain the structural reliability of the moving assembly 13 and has little impact on the contact reliability of the moving assembly 13.
[0046] In the above-mentioned high-voltage DC relay 10, the fixing piece 134 is formed with a supporting surface 1362 capable of supporting the moving contact mechanism 131 on the path where the moving contact mechanism 131 moves towards 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 moving contact mechanism 131 and the static contact 141 of the static contact 14 bounce off due to the electro-dynamic repulsive force. The moving contact mechanism 131 can first compress the elastic element 132 until the supporting surface 1362 supports the moving contact mechanism 131 so that the moving contact mechanism 131 is relatively fixed to the pushing mechanism 133. Since the electro-dynamic repulsive force between the moving contact 1313 and the static contact 141 disappears after the moving contact 1313 and the static contact 141 bounce off, during the process of the moving contact mechanism 131 moving away from the static contact 141 towards the supporting surface 1362, the elastic element 132 can effectively buffer the kinetic energy of the moving contact 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 contact mechanism 131, the impact of the moving contact mechanism 131 on the pushing mechanism 133 and the electromagnetic assembly 12 will not be too large, avoiding damage to the high-voltage DC relay 10 caused by excessive impact resulting in the overall detachment of the moving assembly 13 and the electromagnetic assembly 12 from the static contact 14. Moreover, the support of the supporting surface 1362 for the moving contact mechanism 131 prevents the moving contact mechanism 131 from continuing to move away from the static contact 141, and the distance between the moving contact mechanism 131 and the pushing seat 1331 is still greater than the limit compression length of the elastic element 132, which is beneficial to reducing the relatively bouncing distance between the moving contact 1313 and the static contact 141. The design of cooperating with the buffering of the elastic element 132 to prevent the moving assembly 13 from detaching from the static contact 14 makes the distance between the moving contact 1313 and the static contact 141 not too far, thus being beneficial to avoiding the generation of excessive heat due to arcing between the moving contact 1313 and the static contact 141, which may cause damage or even explosion of the high-voltage DC relay 10. Furthermore, the buffering of the elastic element 132 for the moving contact mechanism 131 can also reduce the requirement for the holding force of the moving assembly 13 on the electromagnetic assembly 12, enabling the iron core of the electromagnetic assembly 12 to support the entire moving assembly 13 with a smaller holding force, which is thus beneficial to reducing the number of turns of the coil winding of the electromagnetic assembly 12 and / or the volume of the iron core, and thus beneficial to the miniaturization design of the high-voltage DC relay 10.
[0047] In some embodiments, an elastic element 132 is disposed between the pushing seat 1331 and the moving spring mechanism 131, and the two ends thereof are respectively abutted against the moving spring mechanism 131 and the pushing seat 1331. The two ends of the elastic element 132 can be respectively connected to the moving spring mechanism 131 and the pushing seat 1331. With such an arrangement, the spatial layout among the moving spring mechanism 131, the elastic element 132, and the pushing mechanism 133 can be reasonably planned, making the structure more compact, which is beneficial to improving the space utilization efficiency of the moving component 13. At the same time, it is also beneficial to make the elastic element 132 relatively far away from the contact positions of the moving contact 1313 and the static contact 141, reducing the influence of high temperature and ablation spatter on the elastic element 132, and reducing the assembly difficulty between the elastic element 132 and other components. It can be understood that when the supporting surface 1362 is located between the moving spring mechanism 131 and the pushing seat 1331, the supporting surface 1362 is farther away from the contact positions of the moving contact 1313 and the static contact 141, which is also beneficial to reducing the influence of high temperature and ablation spatter on the supporting surface 1362. For example, it can prevent the distance between the supporting surface 1362 and the moving spring mechanism 131 from being reduced due to spatter, thus affecting the switching from the second state to the third state.
[0048] Therefore, for the above-mentioned high-voltage DC relay 10, during the process of switching from the second state to the third state, first, the elastic element 132 buffers the impact of the moving spring mechanism 131, and then the electromagnetic assembly 12 bears the impact of the moving spring mechanism 131, which is beneficial to reducing the requirement for the holding force of the electromagnetic assembly 12, beneficial to reducing the cost and volume of the electromagnetic assembly 12, and 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 achieve the effects of small volume, low cost, and high short-circuit current and voltage resistance.
[0049] In some embodiments, please refer to Figure 5 and Figure 6As shown, in some embodiments, the moving spring mechanism 131 includes a moving spring piece 1311 and a lower armature 1314 fixedly connected to the moving spring piece 1311. The high-voltage DC relay 10 further includes an upper armature 143 opposite to the lower armature 1314. The moving contact 1313 is disposed on one side of the moving 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 pushing seat 1331. The upper armature 143 can be fixed to the bracket 135 and located on the side of the moving spring piece 1311 facing away from the pushing seat 1331. The upper armature 143 can also be disposed 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 covers the moving assembly 13 and is disposed on the base 11. Both the static contact 14 and the upper armature 143 are fixedly disposed on the insulating cover 142. The static contact 14 protrudes outside the insulating cover 142 on the side facing away from the moving spring mechanism 131, that is, the side facing away from the static contact 141. When the moving contact 1313 and the static contact 141 are in contact, the magnetic fields generated by the moving contact 1313 and the static contact 141 can magnetize the upper armature 143 and the lower armature 1314, so that the upper armature 143 and the lower armature 1314 attract each other, which can provide a holding force for the moving contact 1313 and the static contact 141, is beneficial to reducing the holding force required by the electromagnetic assembly 12, and is also beneficial to reducing the cost and volume of the electromagnetic assembly 12.
[0050] 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 moving spring piece 1311. Then, 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 pushing seat 1331, and limit the extreme position of the moving spring mechanism 131 away from the pushing seat 1331. Thus, when the upper armature 143 is disposed on the insulating cover 142, the second arm 1357 of the bracket 135 of the moving assembly 13 can be omitted, and only two first arms 1351 are provided to be connected to the pushing seat 1331 and located on both 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 piece 1311 can also be spaced apart by the second arm 1357 of the bracket 135, and then the second arm 1357 limits the extreme position of the moving spring mechanism 131 away from the pushing seat 1331. In any of the embodiments of the different forming methods of the supporting surface 1362 mentioned above, the upper armature 143 can also be disposed on the bracket 135, or on the insulating cover 142 of the static contact 14.
[0051] When the high-voltage DC relay 10 is provided with a short-circuit ring structure, the support surface 1362 can face either the lower armature 1314 or the moving reed 1311. As long as it can abut against either the upper armature 143 or the moving reed 1311 on the moving path of the moving reed mechanism 131 towards the pushing seat 1331 to provide a supporting effect on the moving reed mechanism 131. Of course, the moving component 13 can also be provided with multiple support surfaces 1362, and the multiple support surfaces 1362 face the moving reed 1311 and the upper armature 143 respectively. The support surface 1362 can abut against the moving reed 1311 and the upper armature 143 simultaneously to achieve a more stable and reliable supporting effect on the moving component 13. In some embodiments, the moving component 13 is formed with at least two support surfaces 1362, and the at least two support surfaces 1362 are located on the opposite sides of the elastic element 132. The at least two support surfaces 1362 can face either the moving reed 1311 or the upper armature 143 simultaneously, or can face the moving reed 1311 and the upper armature 143 respectively. Setting at least two opposite support surfaces 1362 to achieve a uniformly distributed supporting effect on the moving reed mechanism 131 at multiple positions, and cooperating with the guiding effect of the bracket 135 on the moving reed mechanism 131, can improve the stability and reliability of the movement of the moving reed mechanism 131 relative to the pushing seat 1331 and avoid the yaw of the moving reed mechanism 131. Of course, in some other embodiments, the short-circuit ring structure can also be omitted, and both sides of the moving reed 1311 can abut against the second arm 1357 and the elastic element 132 respectively.
[0052] It can be understood that when the upper armature 143 is arranged on the bracket 135, for example, arranged on the second arm 1357 and located between the second arm 1357 and the moving reed 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 moving reed 1311 and the lower armature 1314 as a whole move a certain distance towards the pushing seat 1331 relative to the first state, the upper armature 143 and the lower armature 1314 are spaced apart. And when the upper armature 143 is arranged 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. In some 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 holding force for the contact between the moving contact 1313 and the static contact 141.
[0053] In the present application, it is described that the first arm 1351 is in sliding fit with the moving spring mechanism 131. It can be that the opposite sides of the lower armature 1314 are in sliding fit with the opposite surfaces of the two first arms 1351, or the opposite sides of the moving spring piece 1311 are in sliding fit with the two first arms 1351, or a part of the moving spring piece 1311 or the lower armature 1314 is inserted and slidably arranged on the first arm 1351, as long as the first arm 1351 can provide guiding and limiting effects on the movement of the moving spring mechanism 131 relative to the pushing seat 1331.
[0054] 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 a supporting effect on the moving component 13 on the path of the moving component 13 moving towards the pushing seat 1331. The following are some embodiments of different formation methods of the support surface 1362 on the fixing piece 134 as examples.
[0055] Please refer to Figure 1 、 Figure 2 and Figure 3 As shown in, in some embodiments, the fixing piece 134 includes a sheet-like main body (not marked in the figure) and a support structure 136 and two connecting portions 1341 integrally connected to the sheet-like main body. The sheet-like main body is embedded in the pushing seat 1331. The sheet-like main body can be completely located within the pushing seat 1331, only exposing the side surfaces for connecting with the connecting portions 1341 and the support structure 136, or a part of the sheet-like main body can extend out of the pushing seat 1331 for connecting with the connecting portions 1341 and the support structure 136. The two connecting portions 1341 are respectively connected to the opposite two edges of the sheet-like main body and are both connected to the first arm 1351. The support structure 136 can be bent towards the side where the moving spring mechanism 131 is located relative to the sheet-like main body. The support structure 136 protrudes from the side of the pushing seat 1331 towards the moving spring mechanism 131. The end surface of the support structure 136 facing the moving spring mechanism 131 forms the support surface 1362. By providing the support structure 136 with 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 component 13.
[0056] In this embodiment, there can be only one support structure 136, and the support structure 136 and the two connecting portions 1341 are respectively located on three sides of the pushing seat 1331. And in Figures 1-3In the illustrated embodiment, the fixing piece 134 is provided with two supporting structures 136. The two supporting structures 136 are integrally connected to the sheet-like main body and are located on the opposite sides of the elastic element 132. The projection of the line connecting the two supporting structures 136 on the sheet-like main body is perpendicular to the projection of the line connecting the two connecting portions 1341. That is to say, when the pushing seat 1331 is substantially cubic, 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 end portions of the moving reed piece 1311 outside the lower armature 1314, which is beneficial to reasonably plan the layout of each part of the fixing piece 134, the pushing seat 1331, the moving reed mechanism 131 and other components, and improve the structural reliability and performance stability of the moving assembly 13. In this embodiment, the supporting structure 136 integrally formed with the sheet-like main body is separately provided on the fixing piece 134 to form the supporting surface 1362, which is beneficial to reducing the deviation of the spring distance size caused by the riveting process, improving the matching accuracy between components, and thus improving the performance reliability of the high-voltage DC relay 10.
[0057] It can be understood that when the supporting surface 1362 is formed on the fixing piece 134, the fixing piece 134 as a whole can also be made of a metal material. Each part of the fixing piece 134 can be integrally formed, so that each part has a certain elastic deformation ability. Thus, during the process of switching from the second state to the third state, the elastic deformation ability between the parts of the fixing piece 134 can buffer part of the impact of the moving reed mechanism 131, which is beneficial to reducing the requirement for the holding force of the electromagnetic assembly 12 and reducing the volume and cost of the electromagnetic assembly 12.
[0058] In the embodiments shown in the accompanying drawings of the present application, the moving reed 1311 is an integral reed. In other embodiments, the moving reed 1311 may also include two sub-reeds arranged in parallel and spaced apart from each other. When the moving reed mechanism 131 is provided with a lower armature 1314, the lower armature 1314 can be connected to the two sub-reeds simultaneously. The lower armature 1314 may also include two sub-armatures spaced apart from each other, and the two sub-armatures are connected to the two sub-reeds in a one-to-one correspondence. Each moving contact 1313 of the moving reed 1311 can be formed jointly by the corresponding positions of the two sub-reeds. With such an arrangement, the two sub-reeds can provide more stable electrical contact, reduce the poor contact caused by the wear or damage of a single reed, share the mechanical load of the moving contact 1313, reduce the stress on a single reed, improve the durability of the high-voltage DC relay 10, provide a more uniform current distribution, reduce the arc phenomenon and contact resistance, and improve the electrical contact performance. Moreover, when one of the sub-reeds fails, the other sub-reed can still achieve the on-off control of the circuit with the static contact 141, improving the performance reliability of the high-voltage DC relay 10. Of course, in any other embodiments where the support surface 1362 is formed on other components or at other positions, the moving reed 1311 can be an integral body or provided with two sub-reeds, as long as it does not affect the supporting effect of the support surface 1362 on the moving reed mechanism 131, which will not be elaborated here.
[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.
[0060] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended 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; as well as, A dynamic component includes a pushing mechanism, a dynamic spring mechanism, an elastic element, a bracket and a fixed sheet, 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 bracket is slidably matched with the dynamic spring mechanism, the fixed sheet includes a sheet-like body, a supporting structure and a connecting portion connected to the sheet-like body, the sheet-like body is embedded in the pushing mechanism, the connecting portion is connected to the sheet-like body and the bracket, the supporting structure protrudes from a side of the pushing mechanism facing the dynamic spring mechanism, the supporting structure forms a supporting surface on a side facing the dynamic spring mechanism, and the supporting surface is used to support the dynamic spring mechanism on a path of the dynamic spring mechanism moving 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, and the at least two connecting parts 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.
3. The high voltage DC relay according to claim 2, characterized in that: The fixing plate is provided with two supporting structures, which are located on two opposite sides of the elastic element in the axial direction, and the projection of the connecting line of the two supporting structures and the connecting line of the two connecting parts on the sheet-like body intersects.
4. The high voltage DC relay according to claim 1, characterized in that: The sheet-like body, the connecting portion and the supporting structure are integrally formed.
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.