Bridge type loop anti-short-circuit structure and relay

Abstract

The utility model discloses a bridge type loop anti-short-circuit structure and a relay, which relate to the technical field of switching devices and comprise a static contact, a movable contact plate, a push rod assembly, a central spring, a counter-force flat spring and an electromagnetic assembly. The second end of the central spring is connected with the movable contact plate; the counter-force leaf spring is connected with the movable contact plate and has a preset distance with the push rod assembly; the electromagnetic assembly is connected with the push rod assembly; when the static contact is separated from the movable contact plate, the electromagnetic assembly drives the push rod assembly to approach the static contact so that the movable contact plate abuts against the static contact. And after the static contact is in contact with the movable contact plate, the electromagnetic assembly continuously drives the push rod assembly to approach the static contact, so that the push rod assembly is propped against the counter-force leaf spring. According to the scheme, through successive intervention of the central spring and the counter-force leaf spring, the reverse elastic force adaptive to the electromagnetic adsorption acting force is provided for the movable contact plate, normal operation of contact closing operation can be ensured, and meanwhile, large contact pressure can be obtained so that repulsion force generated when the relay is subjected to short-circuit current can be resisted.

Description

Technical Field

[0001] This utility model relates to the field of switching device technology, and in particular to a bridge circuit anti-short circuit structure and a relay. Background Technology

[0002] With the rapid development of the new energy industry, companies are placing increasingly higher demands on relays. While maintaining a small size and low coil power, relays are required to withstand high voltage and high current, as well as possess low contact resistance, strong breaking capacity, and high short-circuit withstand capability. When a relay is subjected to a short-circuit current, a repulsive force can easily generate between the stationary and moving contacts, causing the moving contact to spring back from the stationary contact, resulting in arc leakage and potentially even an explosion. Therefore, improving the resistance between the stationary and moving contacts is crucial.

[0003] Currently, relay products typically increase the contact pressure between the stationary and moving contacts by increasing the electromagnetic attraction force of the induction coil to resist the repulsive force generated by short-circuit current. However, a small increase in the electromagnetic attraction force will lead to a significant increase in the size and power of the induction coil, resulting in a substantial increase in relay costs. This results in poor cost-effectiveness and hinders the development of relay products towards miniaturization and portability. Utility Model Content

[0004] The main purpose of this invention is to propose a bridge-type circuit anti-short-circuit structure, which aims to solve the technical problem that the current method of increasing the electromagnetic adsorption force of the induction coil to increase the contact pressure is not cost-effective and is not conducive to the miniaturization and portability of relay products.

[0005] To achieve the above objectives, the present invention proposes a bridge-type circuit short-circuit protection structure, comprising:

[0006] static contact;

[0007] A movable contact plate, which is disposed opposite to the stationary contact point;

[0008] pushrod assembly;

[0009] A central spring, the first end of which is connected to the push rod assembly, and the second end of which is connected to the moving contact plate;

[0010] A reaction spring is connected to the movable contact plate, and a preset distance exists between the reaction spring and the push rod assembly;

[0011] An electromagnetic assembly is connected to the push rod assembly. When the stationary contact separates from the moving contact plate, the electromagnetic assembly drives the push rod assembly closer to the stationary contact, causing the moving contact plate to abut against the stationary contact. This applies a first pressing force towards the stationary contact to the moving contact plate through the elastic force of the central spring. After the stationary contact contacts the moving contact plate, the electromagnetic assembly continues to drive the push rod assembly closer to the stationary contact, causing the push rod assembly to abut against the reaction spring. This applies a second pressing force towards the stationary contact to the moving contact plate through the elastic force of the reaction spring.

[0012] In one embodiment, the reaction spring has a connecting portion and a supporting portion. The connecting portion is connected to the movable contact plate, the supporting portion extends along a first direction, a first end of the supporting portion is connected to the connecting portion, and a second end of the supporting portion is used to abut against the push rod assembly.

[0013] In one embodiment, the bridge circuit anti-short circuit structure includes at least two of the reaction springs, which are spaced apart around the central spring.

[0014] In one embodiment, the connecting portions of at least two of the reaction springs are connected to form an integral structure.

[0015] In one embodiment, the direction of the push rod assembly near the stationary contact is taken as the closing direction; the first direction has a first component and a second component that are perpendicular to each other, the first component being parallel to the closing direction and the second component being perpendicular to the closing direction.

[0016] In one embodiment, the distance between the first end of the support and the central axis of the push rod assembly is less than the distance between the second end of the support and the central axis of the push rod assembly.

[0017] In one embodiment, the distance between the first end of the support and the central axis of the push rod assembly is greater than the distance between the second end of the support and the central axis of the push rod assembly.

[0018] In one embodiment, the second end of the support portion is provided with a bending structure, which is used to abut against the push rod assembly.

[0019] In one embodiment, the connecting part is connected to the moving contact plate by at least one of riveting, welding, and threaded connection.

[0020] In one embodiment, the push rod assembly includes a push rod body and a support plate; the push rod body is connected to the electromagnetic assembly, the support plate is connected to the push rod body, the support plate is connected to the first end of the central spring, and there is a preset distance between the support plate and the reaction spring;

[0021] When the stationary contact point comes into contact with the moving contact plate, the electromagnetic component drives the push rod body to approach the stationary contact point so that the support plate abuts against the reaction spring.

[0022] In one embodiment, the bridge circuit short-circuit protection structure further includes a limiting member connected to the push rod assembly;

[0023] When the stationary contact point separates from the moving contact plate, the moving contact plate abuts against the limiting member under the elastic force of the central spring; when the stationary contact point contacts the moving contact plate, the moving contact plate separates from the limiting member.

[0024] In one embodiment, the bridge circuit anti-short circuit structure further includes a yoke, the yoke being connected to the side of the moving contact plate facing away from the stationary contact, and the reaction spring being disposed on the side of the yoke facing away from the moving contact plate; the second end of the central spring abuts against the reaction spring to press the reaction spring onto the yoke.

[0025] This utility model also proposes a relay, which includes the bridge circuit anti-short circuit structure as described above.

[0026] The bridge circuit anti-short-circuit structure provided by this utility model does not require increasing the size and power of the induction coil in the electromagnetic component. Instead, it provides a reverse elastic force to the moving contact plate through the sequential intervention of the central spring and the reaction spring. This reverse elastic force is adapted to the change characteristic of the electromagnetic attraction force generated by the electromagnetic component, which is small at first and then large. While ensuring the normal operation of the contact closing, it can obtain a large contact pressure between the moving contact plate and the stationary contact, thereby resisting the repulsive force generated when the relay is subjected to short-circuit current and improving the stability of the relay operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1A schematic cross-sectional view of the first embodiment of the bridge circuit short-circuit protection structure provided by this utility model;

[0029] Figure 2 A partial cross-sectional structural diagram of the first embodiment of the bridge circuit anti-short circuit structure provided by this utility model;

[0030] Figure 3 A partial three-dimensional structural schematic diagram of the first embodiment of the bridge circuit anti-short circuit structure provided by this utility model;

[0031] Figure 4 A schematic cross-sectional view of the second embodiment of the bridge circuit short-circuit protection structure provided by this utility model;

[0032] Figure 5 A partial three-dimensional structural schematic diagram of the second embodiment of the bridge circuit anti-short circuit structure provided by this utility model;

[0033] Figure 6 A schematic cross-sectional view of the third embodiment of the bridge circuit short-circuit protection structure provided by this utility model;

[0034] Figure 7 A three-dimensional structural schematic diagram of the fourth embodiment of the bridge circuit anti-short circuit structure provided by this utility model;

[0035] Figure 8 A three-dimensional structural schematic diagram of the fifth embodiment of the bridge circuit anti-short circuit structure provided by this utility model;

[0036] Figure 9 This is a schematic diagram showing how the electromagnetic adsorption force generated by the electromagnetic component and the reverse elastic force provided by the elastic element in the prior art and this utility model vary with the distance between the armature and the fixed iron core.

[0037] Explanation of icon numbers:

[0038] 1. Stationary contact; 2. Moving contact plate;

[0039] 3. Push rod assembly; 31. Push rod body; 32. Support plate;

[0040] 4. Central spring;

[0041] 5. Reaction spring; 51. Connecting part; 52. Supporting part; 521. Bending structure;

[0042] 6. Electromagnetic components; 7. Limiting components; 8. Yoke.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] With the rapid development of the new energy industry, companies are placing increasingly higher demands on relays. While maintaining a small size and low coil power, relays are required to withstand high voltage and high current, as well as possess low contact resistance, strong breaking capacity, and high short-circuit withstand capability. When a relay is subjected to a short-circuit current, a repulsive force can easily generate between the stationary and moving contacts, causing the moving contact to spring back from the stationary contact, resulting in arc leakage and potentially even an explosion. Therefore, improving the resistance between the stationary and moving contacts is crucial.

[0048] Currently, relay products typically increase the contact pressure between the stationary and moving contacts by increasing the electromagnetic attraction force of the induction coil to resist the repulsive force generated by short-circuit current. However, a small increase in the electromagnetic attraction force will lead to a significant increase in the size and power of the induction coil, resulting in a substantial increase in relay costs. This results in poor cost-effectiveness and hinders the development of relay products towards miniaturization and portability.

[0049] To address the aforementioned issues, this invention provides a bridge-type circuit anti-short-circuit structure. It utilizes the characteristic of the electromagnetic adsorption force of the induction coil changing from small to large during contact closure. By sequentially intervening with two sets of elastic elements, a reverse elastic force adapted to the current electromagnetic adsorption force is provided. This allows for obtaining greater contact pressure without increasing the size and power of the induction coil, while ensuring stable contact closure operation.

[0050] Please see Figure 1 , Figure 2 and Figure 9 The bridge circuit short-circuit protection structure provided by this utility model includes:

[0051] static contact 1;

[0052] Movable contact plate 2 is positioned opposite to stationary contact point 1;

[0053] Push rod assembly 3;

[0054] Central spring 4, the first end of central spring 4 is connected to push rod assembly 3, and the second end of central spring 4 is connected to moving contact plate 2;

[0055] The reaction spring 5 is connected to the moving contact plate 2, and there is a preset distance between the reaction spring 5 and the push rod assembly 3;

[0056] Electromagnetic component 6 is connected to push rod assembly 3. When stationary contact 1 separates from moving contact plate 2, electromagnetic component 6 drives push rod assembly 3 to approach stationary contact 1 so that moving contact plate 2 abuts against stationary contact 1, thereby applying a first pressing force toward stationary contact 1 to moving contact plate 2 through the elastic force of central spring 4. After stationary contact 1 contacts moving contact plate 2, electromagnetic component 6 continues to drive push rod assembly 3 to approach stationary contact 1 so that push rod assembly 3 abuts against reaction spring 5, thereby applying a second pressing force toward stationary contact 1 to moving contact plate 2 through the elastic force of reaction spring 5.

[0057] In this embodiment, with Figure 1 and Figure 2 Taking the orientation shown as an example, the stationary contact 1 can be set as two and arranged at intervals along the horizontal direction; the moving contact plate 2 can be set below the stationary contact 1, and two moving contacts can be set on the upper side of the moving contact plate 2, with the two moving contacts corresponding one-to-one with the two stationary contacts 1; when the relay is not closed, the stationary contact 1 and the corresponding moving contact maintain a certain distance in the height direction.

[0058] The term "push rod assembly 3" can refer to a single push rod structure, or it can refer to the push rod structure and other components fixed to the push rod structure; no limitation is made here.

[0059] The lower end of the central spring 4 can be connected to the push rod assembly 3, and the upper end of the central spring 4 can be connected to the lower side of the moving contact plate 2 and located between the two moving contacts.

[0060] The upper end of the reaction spring 5 can be connected to the lower side of the moving contact plate 2; when the relay is not closed, the lower end of the reaction spring 5 maintains a preset distance from the push rod assembly 3.

[0061] The electromagnetic component 6 is used to drive the push rod assembly 3 to move through the electromagnetic effect. Specifically, when the stationary contact 1 is separated from the moving contact 2, the induction coil in the electromagnetic component 6 generates an induced magnetic field after being energized. The induced magnetic field acts on the fixed iron core, magnetizing it and generating an electromagnetic attraction force to attract the armature below. Under this electromagnetic attraction force, the push rod assembly 3 on the armature moves upward, thereby driving the moving contact 2 on the push rod assembly 3 to abut against the stationary contact 1, so that the moving contact on the moving contact 2 and the stationary contact 1 make contact one-to-one to complete the relay closing operation. After the stationary contact 1 and the moving contact 2 make contact, the electromagnetic component 6 continues to drive the push rod assembly 3 to move upward. Since the moving contact 2 is blocked by the stationary contact 1 at this time... Unable to move further upward, the central spring 4 is compressed. In its compressed state, the central spring 4 applies an upward elastic force (i.e., the aforementioned first pressing force) to the moving contact plate 2, causing the moving contact plate 2 to press tightly against the stationary contact point 1. When the central spring 4 is compressed to a certain extent (i.e., when the push rod assembly 3 moves upward more than the preset distance), the lower end of the reaction spring 5 will contact the push rod assembly 3. As the push rod assembly 3 continues to move upward, the reaction spring 5 will be compressed. In its compressed state, the reaction spring 5 applies an upward elastic force (i.e., the aforementioned second pressing force) to the moving contact plate 2, causing the moving contact plate 2 to press even tighter against the stationary contact point 1.

[0062] Reference Figure 9 The Y-axis represents the change in force (including the electromagnetic attraction force generated by the electromagnetic component 6 and the reverse elastic force provided by the elastic element, in Newtons / N), and the X-axis represents the change in distance between the armature and the fixed iron core in the electromagnetic component 6 (in millimeters / mm). Curve a in the figure shows the change in electromagnetic attraction force generated by the electromagnetic component 6 with the distance between the armature and the fixed iron core. Curve b shows the change in reverse elastic force exerted by the elastic element on the moving contact 2 in the existing relay with the distance between the armature and the fixed iron core. Curve c shows the change in reverse elastic force exerted by the elastic element (including the central spring 4 and the reaction spring 5) on the moving contact 2 with the distance between the armature and the fixed iron core in this embodiment.

[0063] During the process of driving the moving contact 2 to close with the stationary contact 1, in the x0 to x1 interval, the electromagnetic component 6 drives the moving contact 2 to approach the stationary contact 1. Before the moving contact 2 contacts the stationary contact 1, the electromagnetic attraction force is small and the rate of change is small. After the moving contact 2 contacts the stationary contact 1, in order to ensure the tightness and reliability of the closure, the electromagnetic component 6 continues to drive the push rod assembly 3 to move upward, causing the central spring 4 to compress. In the x1 to x2 interval, the central spring 4 generates a reverse elastic force (i.e., the first pressing force), which acts on the moving contact 2, causing the moving contact 2 to press tightly against the stationary contact 1, so as to maintain the stability of the closure between the moving contact and the stationary contact 1. The first pressing force also acts on the push rod assembly 3 and is opposite to the direction of movement of the push rod assembly 3, so as to form the driving resistance of the electromagnetic component 6. Due to the time before the moving contact 2 contacts the stationary contact 1 and after the moving contact 2 contacts the stationary contact 1, the electromagnetic component 6 continues to drive the moving contact 2 to approach the stationary contact 1. Within the interval (corresponding to the x0 to x2 range), the driving force of the electromagnetic component 6 is relatively small. Therefore, only a small reverse elastic force needs to be provided during this stage. As mentioned above, the reverse elastic force is provided only by the central spring 4 at this time. If the reverse elastic force provided during this stage is too large, it will have a negative impact on the driving operation of the electromagnetic component 6. For example, if the reverse elastic force is greater than the electromagnetic attraction force generated by the electromagnetic component 6 on the push rod assembly 3, the push rod assembly 3 will not be able to move upward smoothly under the drive of the electromagnetic component 6. This will cause the armature in the electromagnetic component 6 to fail to close smoothly with the fixed iron core, resulting in poor contact closure stability and easy contact separation.

[0064] As the distance between the armature and the fixed iron core in the electromagnetic component 6 continues to decrease, the electromagnetic attraction force generated by the electromagnetic component 6 will gradually increase, and the rate of increase of the electromagnetic attraction force will gradually increase. At this time, the driving force of the electromagnetic component 6 on the push rod component 3 can gradually resist the larger reverse elastic force. Therefore, in the x2 to x3 range, the reaction spring 5 is compressed. At this time, the reaction spring 5 begins to intervene and together with the central spring 4 provides a reverse elastic force to the moving contact plate 2, so that the moving contact on the moving contact plate 2 and the stationary contact 1 remain in close contact. Under this condition, even if the relay is subjected to a short circuit current and generates a large repulsive force, the reverse elastic force provided by the reaction spring 5 and the central spring 4 can resist the abnormality and maintain the stability of the contact between the moving contact and the stationary contact 1.

[0065] Therefore, the bridge circuit anti-short circuit structure provided in this embodiment does not require increasing the size and power of the induction coil in the electromagnetic component 6. Instead, it provides a reverse elastic force to the moving contact plate 2 by the sequential intervention of the central spring 4 and the reaction spring 5. This reverse elastic force is adapted to the change characteristic of the electromagnetic adsorption force generated by the electromagnetic component 6, which is small at first and then large. Under the condition that the contact closing operation is carried out normally, a large contact pressure can be obtained between the moving contact plate 2 and the stationary contact 1, thereby resisting the repulsive force generated when the relay is subjected to short circuit current and improving the stability of the relay operation.

[0066] In one embodiment, refer to Figure 3 and Figure 5 The reaction spring 5 has a connecting part 51 and a supporting part 52. The connecting part 51 is connected to the moving contact plate 2, and the supporting part 52 extends along a first direction. The first end of the supporting part 52 is connected to the connecting part 51, and the second end of the supporting part 52 is used to abut against the push rod assembly 3.

[0067] Specifically, the connecting portion 51 of the reaction spring 5 can be a horizontally arranged sheet structure, and the connecting portion 51 can be connected to the moving contact plate 2 by at least one of riveting, welding, and threaded connection; the supporting portion 52 of the reaction spring 5 extends along a first direction, the first direction having at least a component along the vertical direction, the upper end of the supporting portion 52 can be integrally formed with the connecting portion 51, and the lower end of the supporting portion 52 is used for, for example Figure 9 The x2 to x3 interval shown abuts against the push rod assembly 3. The push rod assembly 3 can drive the support part 52 to move upward relative to the connecting part 51 or undergo elastic deformation to generate a reverse elastic force on the moving contact plate 2 (i.e. the aforementioned second pressing force).

[0068] Based on the above settings, the functional area on the reaction spring 5 used to connect the moving contact plate 2 and the functional area used to provide the reverse elastic force can be divided, making the structural design of the reaction spring 5 more reasonable.

[0069] In one embodiment, refer to Figures 1 to 6 The bridge circuit anti-short circuit structure includes at least two reaction springs 5, which are arranged at intervals around the central spring 4.

[0070] Specifically, taking two reaction springs 5 ​​as an example, the two reaction springs 5 ​​can be set one-to-one below the two moving contacts of the moving contact plate 2, and the central spring 4 is located between the two reaction springs 5. In this way, a stable multi-point support structure can be formed on the moving contact plate 2, which improves the uniformity of the force on the moving contact plate 2 and makes the moving contact plate 2 less likely to tilt under the reverse elastic force, thereby improving the contact stability between the moving contact and the stationary contact 1.

[0071] When there are two or more reaction springs 5, they can be arranged in the same manner as described above, and will not be repeated here. The connecting parts 51 of the multiple reaction springs 5 ​​can be interconnected or integrated, so that the multiple reaction springs 5 ​​form a... Figures 4 to 6 The integrated structure shown; the connecting part 51 of the multiple reaction springs 5 ​​can also be separately provided, so that the multiple reaction springs 5 ​​are as shown Figures 1 to 3 The springs shown are independent of each other, so the specific positions of each reaction spring 5 can be flexibly adjusted as needed; in practical applications, they can be selected according to the structural layout requirements, and no limitation is made here.

[0072] In one embodiment, refer to Figures 4 to 6 At least two reaction springs 5 ​​are connected at their connecting parts 51 to form an integral structure.

[0073] In this embodiment, multiple reaction springs 5 ​​are formed as follows: Figures 4 to 6 The integrated structure shown here comprises multiple support parts 52 forming multiple support feet. This integrated structure improves the ease of connection between the reaction spring 5 and the moving contact plate 2, and also facilitates maintaining the stability of the relative positions of the various support parts 52.

[0074] In one embodiment, refer to Figures 1 to 6 The direction of the push rod assembly 3 near the stationary contact 1 is taken as the closing direction; the first direction has a first component and a second component that are perpendicular to each other, the first component is parallel to the closing direction, and the second component is perpendicular to the closing direction.

[0075] Specifically, with Figure 1 and Figure 2 Taking the orientation shown as an example, the push rod assembly 3, driven by the electromagnetic assembly 6, approaches the stationary contact 1 from bottom to top, that is, the closing direction is vertically upward. At this time, the first component is vertical and the second component is horizontal. The support part 52 of the reaction spring 5 extends along the first direction, that is, the extension direction of the support part 52 has both vertical and horizontal components, so that the support part 52 can form as shown. Figures 1 to 6 The inclined structure shown allows the lower end of the support portion 52 to extend downwards while gradually moving away from the upper end of the support portion 52 in the horizontal direction, and the lower end of the support portion 52 can also extend downwards while gradually moving closer to the upper end of the support portion 52 in the horizontal direction.

[0076] Based on the aforementioned inclined structure of the support part 52, when the push rod assembly 3 abuts against the lower end of the support plate, as the push rod assembly 3 continues to move upward, the push rod assembly 3 will push the lower end of the support part 52 to rotate upward relative to the connecting part 51. In this way, the relative rotation between the support part 52 and the connecting part 51 can be used to cause the reaction spring 5 to undergo elastic deformation, thereby conveniently generating a reverse elastic force.

[0077] In one embodiment, refer to Figure 4 and Figure 5 The distance between the first end of the support portion 52 and the central axis of the push rod assembly 3 is less than the distance between the second end of the support portion 52 and the central axis of the push rod assembly 3.

[0078] Specifically, the central axis of the push rod assembly 3 can refer to the central axis of the push rod structure within the push rod assembly 3. Figure 4 Taking the orientation shown as an example, the central axis of the push rod assembly 3 extends in the vertical direction; in this embodiment, the support portion 52 of the reaction spring 5 extends from top to bottom while gradually expanding outward in a direction away from the central spring 4; when two reaction springs 5 ​​are set, the two reaction springs 5 ​​can form as shown in the figure. Figure 4 and Figure 5 The trapezoidal structure is shown. Under the push of the push rod assembly 3, the support part 52 can rotate upward relative to the connecting part 51 from the outside.

[0079] In one embodiment, refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 The distance between the first end of the support portion 52 and the central axis of the push rod assembly 3 is greater than the distance between the second end of the support portion 52 and the central axis of the push rod assembly 3.

[0080] by Figure 1 , Figure 2 and Figure 6 Taking the orientation shown as an example, the central axis of the push rod assembly 3 extends in the vertical direction; in this embodiment, the support part 52 of the reaction spring 5 extends from top to bottom while gradually contracting inward toward the central spring 4; when two reaction springs 5 ​​are set, the two reaction springs 5 ​​can form as shown in the figure. Figure 1 , Figure 2 , Figure 3 and Figure 6 The inverted trapezoidal structure is shown. Under the push of the push rod assembly 3, the support part 52 can rotate upward from the inner side relative to the connecting part 51.

[0081] When multiple reaction springs 5 ​​are provided, based on the two specific structural forms of the reaction springs 5 ​​described above, multiple support parts 52 can rotate upward relative to the connecting part 51 simultaneously under the push of the push rod assembly 3, thereby conveniently generating reverse elastic force on the moving contact plate 2 from multiple positions and improving the uniformity of force on the moving contact plate 2.

[0082] In one embodiment, refer to Figures 1 to 6 The second end of the support part 52 is provided with a bending structure 521, which is used to abut against the push rod assembly 3.

[0083] As illustrated, by setting the bending structure 521, the corner of the second end of the support part 52 can be prevented from directly contacting the push rod assembly 3, thus avoiding scratches and other problems. It can also reduce friction and improve the smoothness of the second end of the support part 52 sliding on the surface of the push rod assembly 3.

[0084] In one embodiment, refer to Figure 1 , Figure 2 , Figure 4 and Figure 6 The push rod assembly 3 includes a push rod body 31 and a support plate 32; the push rod body 31 is connected to the electromagnetic assembly 6, the support plate 32 is connected to the push rod body 31, the support plate 32 is connected to the first end of the central spring 4, and there is a preset distance between the support plate 32 and the reaction spring 5.

[0085] When the stationary contact 1 contacts the moving contact plate 2, the electromagnetic component 6 drives the push rod body 31 to approach the stationary contact 1 so that the support plate 32 abuts against the reaction spring 5.

[0086] In this embodiment, the support plate 32 can be horizontally arranged and connected to the upper end of the push rod body 31 as shown in the figure; the support plate 32 can be used to increase the bearing area of ​​the upper end of the push rod body 31, thereby providing a connection fulcrum for the central spring 4 and an abutment fulcrum for the support portion 52 of the reaction spring 5.

[0087] When the second end of the support part 52 is provided with a bending structure 521, the bending structure 521 is used to abut against the support plate 32; during the upward movement of the push rod body 31, the support part 52 can rotate relative to the connecting part 51 under the drive of the support plate 32 to generate a reverse elastic force.

[0088] In some exemplary embodiments, an elastic colloid is provided on the tray 32; when the second end of the support 52 slides to a preset position on the surface of the tray 32, the elastic colloid is used to abut against the second end of the support 52 to apply elastic resistance to the second end of the support 52 and prevent the second end of the support 52 from continuing to slide relative to the tray 32.

[0089] In this embodiment, the elastic colloid can intervene when the reaction spring 5 deforms to a certain extent (i.e., after the reaction spring 5 contacts the support plate 32, and the push rod body 31 continues to move upward a certain distance under the drive of the electromagnetic component 6), to further provide a reverse elastic force to the moving contact plate 2, so that the moving contact plate 2 is more tightly attached to the stationary contact point 1, in order to better adapt to the rapidly increasing electromagnetic adsorption force in the later stage. Preferably, the elastic colloid can be set as a wedge-shaped structure with a height dimension that gradually increases along a third direction, where the third direction is the sliding direction of the second end of the support part 52 on the surface of the support plate 32, so as to provide a gradually increasing reverse elastic force to the moving contact plate 2 during the movement of the second end of the support part 52, and better realize the gradient growth of the reverse elastic force.

[0090] The elastic colloid can be made of insulating material. When the distance between the first end of the support 52 and the central axis of the push rod assembly 3 is greater than the distance between the second end of the support 52 and the central axis of the push rod assembly 3, the elastic colloid can be correspondingly disposed between the second end of the support 52 and the central spring 4. In this way, while providing a reverse elastic force, the elastic colloid can also form a barrier between the support 52 and the central spring 4, thereby preventing the second end of the support 52 from moving excessively on the surface of the support plate 32 and accidentally contacting the central spring 4 under the influence of some uncontrollable factors.

[0091] In one embodiment, refer to Figure 1 , Figure 2 , Figure 4 and Figure 6 The bridge circuit anti-short circuit structure also includes a limiting member 7, which is connected to the push rod assembly 3;

[0092] When the stationary contact 1 separates from the moving contact plate 2, the moving contact plate 2 abuts against the limiting member 7 under the elastic force of the central spring 4; when the stationary contact 1 contacts the moving contact plate 2, the moving contact plate 2 separates from the limiting member 7.

[0093] By setting the limiting component 7, the central spring 4 can be in a pre-compressed state and have a certain elastic potential energy. When the moving contact plate 2 contacts the stationary contact 1, the limiting component 7 continues to move upward under the drive of the push rod assembly 3 and separates from the moving contact plate 2. At this time, the central spring 4 in the pre-compressed state can release the stored elastic potential energy directly to the stationary contact 1 through the moving contact plate 2. That is, the central spring 4 does not need to apply a reverse elastic force to the moving contact plate 2 after it has closed from zero. This makes the changing trend of the reverse elastic force more compatible with the changing trend of the electromagnetic adsorption force of the electromagnetic assembly 6, and can better meet the requirements of the actual contact closing operation process.

[0094] In addition, by pushing the moving contact plate 2 against the limiting member 7 through the central spring 4, the positional stability of the moving contact plate 2 during the contact closure operation can be ensured, and the lateral positional displacement relative to the push rod assembly 3 can be avoided because the moving contact plate 2 is only constrained by the central spring 4.

[0095] In one embodiment, refer to Figure 7 and Figure 8 The bridge circuit anti-short circuit structure also includes a yoke 8, which is connected to the side of the moving contact plate 2 facing away from the stationary contact 1. The reaction spring 5 is set on the side of the yoke 8 facing away from the moving contact plate 2. The second end of the central spring 4 abuts against the reaction spring 5 to press the reaction spring 5 onto the yoke 8.

[0096] In this embodiment, when the moving contact of the moving contact 2 closes with the stationary contact 1, the current through the moving contact can magnetize the yoke 8, causing the yoke 8 and the other magnetic yoke above to generate a magnetic force that attracts each other. This magnetic force will drive the moving contact 2 to press against the stationary contact 1, thus restricting the separation action between the moving contact 2 and the stationary contact 1. This makes the closing of the moving contact and the stationary contact 1 more stable and reliable, and can further improve the resistance to the repulsive force generated by the large current during a short circuit.

[0097] In some embodiments, where a yoke 8 is provided on the moving contact plate 2, the reaction spring 5 can be as follows: Figure 4 and Figure 6 As shown, it is positioned between the moving contact plate 2 and the yoke 8; in other embodiments, the reaction spring 5 can be as follows: Figure 7 and Figure 8 The yoke 8 is positioned on the side opposite to the moving contact plate 2 and abuts against the upper end of the central spring 4. At this time, the elastic force generated when the central spring 4 is compressed can be used to position and press the reaction spring 5 against the surface of the yoke 8, so that the relative fixation between the reaction spring 5 and the moving contact plate 2 can be conveniently achieved with the help of the central spring 4.

[0098] This utility model embodiment also provides a relay, please refer to... Figures 1 to 8 The relay includes the bridge circuit short-circuit protection structure in any of the above embodiments.

[0099] The specific structure of the bridge circuit anti-short-circuit structure can be referred to the above embodiments. Since the relay adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments. That is, it does not need to increase the size and power of the induction coil in the electromagnetic component 6. Instead, the central spring 4 and the reaction spring 5 are used to provide a reverse elastic force to the moving contact 2. This reverse elastic force is adapted to the change characteristic of the electromagnetic attraction force generated by the electromagnetic component 6, which is small at first and then large. Under the condition that the contact closing operation is normal, a large contact pressure can be obtained between the moving contact 2 and the stationary contact 1, thereby resisting the repulsive force generated when the relay is subjected to short-circuit current and improving the stability of the relay operation.

[0100] It should be noted that other aspects of the bridge circuit anti-short circuit structure and relay disclosed in this utility model can be found in the prior art, and will not be repeated here.

[0101] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A bridge-type circuit short-circuit protection structure, characterized in that, The bridge-type circuit short-circuit protection structure includes: static contact(1); A movable contact plate (2) is disposed opposite to the stationary contact point (1); Push rod assembly (3); A central spring (4), the first end of which is connected to the push rod assembly (3), and the second end of which is connected to the moving contact plate (2); A reaction spring (5) is connected to the moving contact plate (2), and there is a preset distance between the reaction spring (5) and the push rod assembly (3); An electromagnetic component (6) is connected to the push rod assembly (3). When the stationary contact (1) is separated from the moving contact plate (2), the electromagnetic component (6) drives the push rod assembly (3) to approach the stationary contact (1) so that the moving contact plate (2) abuts against the stationary contact (1), thereby applying a first pressing force toward the stationary contact (1) to the moving contact plate (2) through the elastic force of the central spring (4). After the stationary contact (1) contacts the moving contact plate (2), the electromagnetic component (6) continues to drive the push rod assembly (3) to approach the stationary contact (1) so that the push rod assembly (3) abuts against the reaction spring (5), thereby applying a second pressing force toward the stationary contact (1) to the moving contact plate (2) through the elastic force of the reaction spring (5).

2. The bridge-type circuit short-circuit protection structure as described in claim 1, characterized in that, The reaction spring (5) has a connecting part (51) and a supporting part (52). The connecting part (51) is connected to the moving contact plate (2). The supporting part (52) extends in a first direction. The first end of the supporting part (52) is connected to the connecting part (51). The second end of the supporting part (52) is used to abut against the push rod assembly (3).

3. The bridge-type circuit short-circuit protection structure as described in claim 2, characterized in that, The bridge circuit anti-short circuit structure includes at least two reaction springs (5), which are spaced apart around the central spring (4).

4. The bridge-type circuit short-circuit protection structure as described in claim 3, characterized in that, The connecting portions (51) of at least two of the reaction springs (5) are connected to form an integral structure.

5. The bridge-type circuit short-circuit protection structure as described in claim 2, characterized in that, The direction of the push rod assembly (3) near the stationary contact (1) is taken as the closing direction; the first direction has a first component and a second component that are perpendicular to each other, the first component is parallel to the closing direction, and the second component is perpendicular to the closing direction.

6. The bridge-type circuit short-circuit protection structure as described in claim 5, characterized in that, The distance between the first end of the support (52) and the central axis of the push rod assembly (3) is less than the distance between the second end of the support (52) and the central axis of the push rod assembly (3); Alternatively, the distance between the first end of the support (52) and the central axis of the push rod assembly (3) is greater than the distance between the second end of the support (52) and the central axis of the push rod assembly (3).

7. The bridge-type circuit short-circuit protection structure as described in claim 2, characterized in that, The second end of the support (52) is provided with a bending structure (521), which is used to abut against the push rod assembly (3); And / or, the connecting part (51) is connected to the moving contact plate (2) by at least one of riveting, welding, and threaded connection.

8. The bridge-type circuit short-circuit protection structure as described in claim 1, characterized in that, The push rod assembly (3) includes a push rod body (31) and a support plate (32); the push rod body (31) is connected to the electromagnetic assembly (6), the support plate (32) is connected to the push rod body (31), the support plate (32) is connected to the first end of the central spring (4), and there is a preset distance between the support plate (32) and the reaction spring (5); when the stationary contact (1) contacts the moving contact plate (2), the electromagnetic assembly (6) is used to drive the push rod body (31) to approach the stationary contact (1) so that the support plate (32) abuts against the reaction spring (5); And / or, the bridge circuit anti-short circuit structure further includes a limiting member (7), which is connected to the push rod assembly (3); when the stationary contact (1) separates from the moving contact plate (2), the moving contact plate (2) abuts against the limiting member (7) under the elastic force of the central spring (4); when the stationary contact (1) contacts the moving contact plate (2), the moving contact plate (2) separates from the limiting member (7).

9. The bridge-type circuit short-circuit protection structure as described in claim 1, characterized in that, The bridge circuit anti-short circuit structure also includes a yoke (8), which is connected to the side of the moving contact plate (2) facing away from the stationary contact (1). The reaction spring (5) is disposed on the side of the yoke (8) facing away from the moving contact plate (2). The second end of the central spring (4) abuts against the reaction spring (5) to press the reaction spring (5) onto the yoke (8).

10. A relay, characterized in that, The relay includes a bridge circuit short-circuit protection structure as described in any one of claims 1 to 9.

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