Bridge type loop anti-short-circuit structure and relay

Abstract

The invention discloses a bridge-type loop anti-short-circuit structure and a relay, and relates to the technical field of switching devices, and the bridge-type loop anti-short-circuit structure comprises 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] The present invention relates to the technical field of switching devices, and particularly relates to a bridge circuit anti-short circuit structure and a relay. Background Art

[0002] With the rapid development of the new energy industry, the requirements of each enterprise for relays are getting higher and higher. On the basis of maintaining the characteristics of a small volume and a small coil power, it is required that the relay product can withstand high voltage and high current, and it is also required that the relay product has a low contact resistance, a strong breaking ability and a high anti-short circuit ability. When a relay withstands a short-circuit current, a repulsive force is likely to be generated between the static contact and the moving contact, causing the moving contact to bounce away from the static contact, resulting in the problem of suction bounce-back, causing arc leakage, and even possibly causing the relay to explode. Therefore, it is very important to improve the resistance between the static contact and the moving contact.

[0003] At present, relay products usually increase the electromagnetic adsorption force of the induction coil to increase the contact pressure between the static contact and the moving contact in order to resist the repulsive force generated by the short-circuit current. However, a small increase in the electromagnetic adsorption force will cause the size and power of the induction coil to increase exponentially, resulting in a significant increase in the cost of the relay, poor cost-effectiveness, and being not conducive to the development of relay products in the direction of miniaturization and lightness. Summary of the Invention

[0004] The main object of the present invention is to propose a bridge circuit anti-short circuit structure, aiming to solve the technical problems that the current method of increasing the electromagnetic adsorption force of the induction coil to increase the contact pressure has poor cost-effectiveness and is not conducive to the development of relay products in the direction of miniaturization and lightness.

[0005] To achieve the above object, the bridge circuit anti-short circuit structure proposed by the present invention includes:

[0006] A static contact;

[0007] A moving contact plate, which is disposed opposite to the static contact;

[0008] A push rod assembly;

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

[0010] A reaction piece spring, which is connected to the moving contact plate, and there is a preset distance between the reaction piece spring and the push rod assembly;

[0011] An electromagnetic component, the electromagnetic component is connected to the push rod component; when the static contact is separated from the moving contact plate, the electromagnetic component is used to drive the push rod component close to the static contact, so that the moving contact plate abuts against the static contact, thereby applying a first pressing force towards the static contact to the moving contact plate through the elastic force of the central spring; when the static contact contacts the moving contact plate, the electromagnetic component is used to continue to drive the push rod component close to the static contact, so that the push rod component abuts against the reaction piece spring, thereby applying a second pressing force towards the static contact to the moving contact plate through the elastic force of the reaction piece spring.

[0012] In one embodiment, the reaction piece spring has a connecting portion and a supporting portion, the connecting portion is connected to the moving contact plate, the supporting portion extends in 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 component.

[0013] In one embodiment, the bridge circuit anti-short circuit structure includes at least two of the reaction piece springs, and at least two of the reaction piece springs are arranged at intervals around the central spring.

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

[0015] In one embodiment, the direction in which the push rod component approaches the static 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 is parallel to the closing direction, and the second component is perpendicular to the closing direction.

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

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

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

[0019] In one embodiment, the connecting portion is connected to the moving contact plate by at least one of the connection methods 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 plate spring;

[0021] After the static contact touches the moving contact plate, the electromagnetic assembly is used to drive the push rod body close to the static contact, so that the support plate abuts against the reaction plate spring.

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

[0023] When the static contact 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 static contact touches 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 is connected to the side of the moving contact plate facing away from the static contact, and the reaction plate spring is arranged on the side of the yoke facing away from the moving contact plate; the second end of the central spring abuts against the reaction plate spring to press the reaction plate spring against the yoke.

[0025] The present invention also provides a relay, and the relay includes the bridge circuit anti-short circuit structure as described above.

[0026] For the bridge circuit anti-short circuit structure provided by the present invention, without increasing the size and power of the induction coil in the electromagnetic assembly, the central spring and the reaction plate spring are successively involved to provide a reverse elastic force for the moving contact plate. This reverse elastic force adapts to the changing characteristics of the electromagnetic adsorption force generated by the electromagnetic assembly, which first decreases and then increases. Under the condition of ensuring the normal operation of the contact closing operation, a larger contact pressure can be obtained between the moving contact plate and the static contact, so as to resist the repulsive force generated when the relay withstands short-circuit current and improve the working stability of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 It is a schematic cross-sectional structure diagram of the first embodiment of the bridge circuit anti-short circuit structure provided by the present invention;

[0029] Figure 2 Schematic diagram of the partial sectional structure of the first embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0030] Figure 3 Schematic diagram of the partial three-dimensional structure of the first embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0031] Figure 4 Schematic diagram of the overall sectional structure of the second embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0032] Figure 5 Schematic diagram of the partial three-dimensional structure of the second embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0033] Figure 6 Schematic diagram of the overall sectional structure of the third embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0034] Figure 7 Schematic diagram of the three-dimensional structure of the fourth embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0035] Figure 8 Schematic diagram of the three-dimensional structure of the fifth embodiment of the bridge circuit short-circuit resistance structure provided by the present invention;

[0036] Figure 9 Schematic diagram showing the change of the electromagnetic adsorption force generated by the electromagnetic component and the reverse elastic force provided by the elastic member with the distance between the armature and the fixed iron core in the prior art and the present invention.

[0037] Explanation of the reference numerals in the drawings:

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

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

[0040] 4. Central spring;

[0041] 5. Reaction plate spring; 51. Connection part; 52. Support part; 521. Bending structure;

[0042] 6. Electromagnetic component; 7. Limiting member; 8. Yoke iron.

[0043] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0045] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indication will also change accordingly.

[0046] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] With the rapid development of the new energy industry, enterprises have higher and higher requirements for relays. On the basis of maintaining the characteristics of a small volume and a small coil power, it is required that the relay product can withstand high voltage and high current, and it is also required that the relay product has a low contact resistance, a strong breaking ability, and a high short-circuit resistance. When a relay withstands a short-circuit current, it is easy to generate a repulsive force between the static contact and the moving contact, which will bounce the moving contact away from the static contact, resulting in the problem of suction bounce-back, causing arc leakage, and even possibly leading to an explosion of the relay. Therefore, it is very important to improve the resistance between the static contact and the moving contact.

[0048] Currently, relay products usually increase the electromagnetic adsorption force of the induction coil to increase the contact pressure between the static contact and the moving contact in order to resist the repulsive force generated by the short-circuit current. However, a small increase in the electromagnetic adsorption force will lead to a multiple increase in the size and power of the induction coil, resulting in a significant increase in the cost of the relay, poor cost-effectiveness, and being not conducive to the development of relay products towards miniaturization and lightness.

[0049] To solve the above problems, the present invention provides a bridge circuit anti-short circuit structure, aiming to utilize the characteristic that the electromagnetic adsorption force of the induction coil changes from small to large during the contact closing process, and provide a reverse elastic force adapted to the current electromagnetic adsorption force through the sequential intervention of two sets of elastic members, so as to obtain a larger contact pressure without increasing the size and power of the induction coil, and at the same time ensure the stable progress of the contact closing operation.

[0050] Please refer to Figure 1 、 Figure 2 and Figure 9 , the bridge circuit anti-short circuit structure provided by the present invention includes:

[0051] Stationary contact 1;

[0052] Moving contact plate 2, which is arranged opposite to the stationary contact 1;

[0053] Push rod assembly 3;

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

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

[0056] Electromagnetic assembly 6, which is connected to the push rod assembly 3; when the stationary contact 1 is separated from the moving contact plate 2, the electromagnetic assembly 6 is used to drive 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 towards the stationary contact 1 to the moving contact plate 2 through the elastic force of the central spring 4; when the stationary contact 1 contacts the moving contact plate 2, the electromagnetic assembly 6 is used to continue to drive the push rod assembly 3 to approach the stationary contact 1, so that the push rod assembly 3 abuts against the reaction plate spring 5, thereby applying a second pressing force towards the stationary contact 1 to the moving contact plate 2 through the elastic force of the reaction plate spring 5.

[0057] In this embodiment, taking the orientation shown in Figure 1 and Figure 2 as an example, two stationary contacts 1 can be arranged at intervals along the horizontal direction; the moving contact plate 2 can be arranged below the stationary contacts 1, and two moving contacts can be arranged on the upper side of the moving contact plate 2, and the two moving contacts correspond to the two stationary contacts 1 one by one; in the state where the relay is not closed, there is a certain distance in the height direction between the stationary contact 1 and the corresponding moving contact.

[0058] The push rod assembly 3 can refer to a single push rod structure, or can also refer to the push rod structure and other components fixed on the push rod structure, which is not limited 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 is located between the two moving contacts.

[0060] The upper end of the reaction piece spring 5 can be connected to the lower side of the moving contact plate 2; in the state where the relay is not closed, a preset distance is maintained between the lower end of the reaction piece spring 5 and the push rod assembly 3.

[0061] The electromagnetic assembly 6 is used to drive the movement of the push rod assembly 3 through the electro - magnetic effect. Specifically, when the static contact 1 is separated from the moving contact plate 2, after the induction coil in the electromagnetic assembly 6 is powered on, an induced magnetic field will be generated. The induced magnetic field acts on the fixed iron core, magnetizes the fixed iron core and generates an electromagnetic adsorption force to adsorb the armature below, so that the push rod assembly 3 on the armature moves upward under this electromagnetic adsorption force, and then drives the moving contact plate 2 on the push rod assembly 3 to abut against the static contact 1, so that the moving contacts on the moving contact plate 2 are in one - to - one contact with the static contact 1 to complete the closing operation of the relay; after the static contact 1 contacts the moving contact plate 2, the electromagnetic assembly 6 continues to drive the push rod assembly 3 to move upward. Since the moving contact plate 2 is blocked by the static contact 1 at this time and cannot continue to move upward, the central spring 4 will be compressed; the compressed central spring 4 will apply an upward elastic force (i.e., the aforementioned first pressing force) to the moving contact plate 2, so that the moving contact plate 2 is closely attached to the static contact 1; when the central spring 4 is compressed to a certain extent (i.e., when the push rod assembly 3 moves upward beyond the stroke by a preset distance), the lower end of the reaction piece spring 5 will contact the push rod assembly 3. As the push rod assembly 3 continues to move upward, the reaction piece spring 5 will be compressed, and the compressed reaction piece spring 5 will apply an upward elastic force (i.e., the aforementioned second pressing force) to the moving contact plate 2, so that the moving contact plate 2 is further closely attached to the static contact 1.

[0062] Refer to Figure 9 , the Y - axis represents the magnitude change of the force (including the electromagnetic adsorption force generated by the electromagnetic assembly 6 and the reverse elastic force provided by the elastic member, with the unit of Newton / N), and the X - axis represents the distance change (with the unit of millimeter / mm) between the armature and the fixed iron core in the electromagnetic assembly 6. The curve a in the figure represents the situation of the electromagnetic adsorption force generated by the electromagnetic assembly 6 changing with the distance between the armature and the fixed iron core, the curve b represents the situation of the reverse elastic force exerted by the elastic member on the moving contact plate 2 in the existing relay changing with the distance between the armature and the fixed iron core, and the curve c represents the situation of the reverse elastic force exerted by the elastic member (including the central spring 4 and the reaction piece spring 5) on the moving contact plate 2 in this embodiment changing with the distance between the armature and the fixed iron core.

[0063] During the process of driving the moving contact plate 2 to close with the static contact 1, at x 0 ~x 1In the interval, the electromagnetic component 6 drives the moving contact plate 2 close to the static contact 1. Before the moving contact plate 2 contacts the static contact 1, the electromagnetic adsorption force is small and the change rate is small. After the moving contact plate 2 contacts the static contact 1, to ensure the tightness and reliability of the closure, the electromagnetic component 6 continues to drive the push rod assembly 3 to move upward, compressing the central spring 4; at x 1 ~x 2 interval, the central spring 4 generates a reverse elastic force (i.e., the first pressing force), which acts on the moving contact plate 2, causing the moving contact plate 2 to tightly press against the static contact 1 to maintain the stability of the closure between the moving contact and the static contact 1; the first pressing force also acts on the push rod assembly 3 and is opposite to the moving direction of the push rod assembly 3 to constitute the driving resistance of the electromagnetic component 6; since before the moving contact plate 2 contacts the static contact 1 and for a period of time after the moving contact plate 2 contacts the static contact 1 (corresponding to x 0 ~x 2 interval), the driving force of the electromagnetic component 6 is small, so only a small reverse elastic force needs to be provided at this stage. As described above, only the central spring 4 provides the reverse elastic force at this time; if the reverse elastic force provided at 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 adsorption 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, resulting in the armature and the fixed iron core in the electromagnetic component 6 not being able to close smoothly, causing poor stability of the contact closure and prone to contact detachment.

[0064] As the distance between the armature and the fixed iron core in the electromagnetic component 6 continues to decrease, the electromagnetic adsorption force generated by the electromagnetic component 6 will gradually increase, and the growth rate of the electromagnetic adsorption force will gradually increase. At this time, the driving force of the electromagnetic component 6 on the push rod assembly 3 has gradually been able to resist a greater reverse elastic force; therefore, in the interval of x 2 ~x 3 interval, the reaction plate spring 5 is compressed. At this time, the reaction plate spring 5 begins to intervene and provides a reverse elastic force to the moving contact plate 2 together with the central spring 4, so that the moving contact on the moving contact plate 2 remains in close contact with the static contact 1; in this case, even if the relay experiences a short-circuit current and generates a large repulsive force, the reverse elastic force jointly provided by the reaction plate spring 5 and the central spring 4 can resist this abnormal movement and maintain the stability of the contact between the moving contact and the static contact 1.

[0065] It can be seen that for the short - circuit resistant structure of the bridge circuit provided in this embodiment, there is no need to increase the size and power of the induction coil in the electromagnetic component 6. Instead, the central spring 4 and the reaction plate spring 5 intervene successively to provide a reverse elastic force for the moving contact plate 2. This reverse elastic force adapts to the characteristic that the electromagnetic adsorption force generated by the electromagnetic component 6 changes from small to large. Under the condition of ensuring the normal operation of the contact closing operation, a relatively large contact pressure can be obtained between the moving contact plate 2 and the static contact 1, so as to resist the repulsive force generated when the relay withstands a short - circuit current and improve the working stability of the relay.

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

[0067] Specifically, the connecting portion 51 of the reaction plate spring 5 can be a horizontally arranged sheet - like structure, and the connecting portion 51 can be connected to the moving contact plate 2 by at least one of the connection methods such as riveting, welding, and screw connection; the supporting portion 52 of the reaction plate spring 5 extends in the first direction, and the first direction has at least a component in the up - and - down 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 to abut against the push - rod assembly 3 in the x Figure 9 shown as 2 ~x 3 interval. The push - rod assembly 3 can drive the supporting portion 52 to move upward relative to the connecting portion 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 of the reaction plate spring 5 for connecting the moving contact plate 2 and the functional area for providing the reverse elastic force can be divided, making the structural design of the reaction plate spring 5 more reasonable.

[0069] In one embodiment, referring to Figures 1 to 6 , the short - circuit resistant structure of the bridge circuit includes at least two reaction plate springs 5, and the at least two reaction plate springs 5 are arranged at intervals around the central spring 4.

[0070] Specifically, taking the reaction plate spring 5 being set to two as an example, the two reaction plate springs 5 can be arranged 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 plate springs 5. In this way, a stable multi - point support structure can be formed on the moving contact plate 2, improving the force uniformity of the moving contact plate 2, making the moving contact plate 2 less likely to be skewed under the reverse elastic force, and thus improving the contact stability between the moving contact and the static contact 1.

[0071] When there are two or more reaction plate springs 5, they can be arranged in the same way as the above form, which will not be elaborated here. Among them, the connecting parts 51 of multiple reaction plate springs 5 can be connected to each other or integrally arranged, so that multiple reaction plate springs 5 form an integral structure as shown in Figures 4 to 6 ; the connecting parts 51 of multiple reaction plate springs 5 can also be separately arranged, so that multiple reaction plate springs 5 are independent of each other as shown in Figures 1 to 3 . In this way, the specific setting positions of each reaction plate spring 5 can be flexibly adjusted according to needs; in actual applications, it can be selected according to the requirements of the structural layout, which is not limited here.

[0072] In an embodiment, referring to Figures 4 to 6 , the connecting parts 51 of at least two reaction plate springs 5 are connected to form an integral structure.

[0073] In this embodiment, multiple reaction plate springs 5 form an integral structure as shown in Figures 4 to 6 . At this time, multiple support parts 52 constitute multiple support feet of this integral structure. Based on this integral structural form, the connection convenience between the reaction plate spring 5 and the moving contact plate 2 can be improved, and it is also more conducive to maintaining the stability of the relative positions between the support parts 52.

[0074] In an embodiment, referring to Figures 1 to 6 , the direction in which the push rod assembly 3 approaches the static contact 1 is used 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, taking the orientations shown in Figure 1 and Figure 2 as an example, the push rod assembly 3 approaches the static contact 1 from bottom to top under the drive of the electromagnetic assembly 6, that is, the closing direction is vertically upward. At this time, the first component is in the vertical direction and the second component is in the horizontal direction; the support part 52 of the reaction plate spring 5 extends along the first direction, that is, the extension direction of the support part 52 has both a vertical component and a horizontal component at the same time. In this way, the support part 52 can form an inclined structure as shown in Figures 1 to 6 . The lower end of the support part 52 can gradually move away from the upper end of the support part 52 in the horizontal direction while extending from top to bottom, or the lower end of the support part 52 can gradually approach the upper end of the support part 52 in the horizontal direction while extending from top to bottom.

[0076] Based on the above 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 plate spring 5 to undergo elastic deformation, so that a reverse elastic force can be conveniently generated.

[0077] In one embodiment, referring 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 may refer to the central axis of the push rod structure in the push rod assembly 3. Taking the orientation shown in Figure 4 as an example, the central axis of the push rod assembly 3 extends in the up and down direction; in this embodiment, the support portion 52 of the reaction plate spring 5 gradually expands outward away from the central spring 4 while extending from top to bottom; when two reaction plate springs 5 are provided, the two reaction plate springs 5 can form a trapezoidal structure as shown in Figure 4 and Figure 5 . Under the push of the push rod assembly 3, the support portion 52 can rotate upward relative to the connecting portion 51 on the outside.

[0079] In one embodiment, referring 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] Taking the orientation shown in Figure 1 , Figure 2 and Figure 6 as an example, the central axis of the push rod assembly 3 extends in the up and down direction; in this embodiment, the support portion 52 of the reaction plate spring 5 gradually contracts inward toward the central spring 4 while extending from top to bottom; when two reaction plate springs 5 are provided, the two reaction plate springs 5 can form an inverted trapezoidal structure as shown in Figure 1 , Figure 2 , Figure 3 and Figure 6 . Under the push of the push rod assembly 3, the support portion 52 can rotate upward relative to the connecting portion 51 on the inside.

[0081] When multiple reaction plate springs 5 are provided, based on the above two specific structural forms of the reaction plate spring 5, the multiple support portions 52 can rotate upward relative to the connecting portion 51 simultaneously under the push of the push rod assembly 3, so as to conveniently generate reverse elastic acting forces on the moving contact plate 2 from multiple positions and improve the force uniformity of the moving contact plate 2.

[0082] In one embodiment, referring to Figures 1 to 6 , a bending structure 521 is provided at the second end of the support portion 52, and the bending structure 521 is used to abut against the push rod assembly 3.

[0083] Illustratively, by providing the bending structure 521, it is possible to avoid problems such as scratches caused by the corner position of the second end of the support portion 52 directly contacting the push rod assembly 3, and it is possible to reduce the friction force and improve the smoothness of the second end of the support portion 52 during the sliding process on the surface of the push rod assembly 3.

[0084] In one embodiment, referring 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 plate spring 5;

[0085] After the static contact 1 contacts the moving contact plate 2, the electromagnetic assembly 6 is used to drive the push rod body 31 close to the static contact 1 so that the support plate 32 abuts against the reaction plate spring 5.

[0086] In this embodiment, the support plate 32 can be horizontally arranged as shown in the figure and connected to the upper end of the push rod body 31; 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 plate spring 5.

[0087] When the second end of the support portion 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 portion 52 can rotate relative to the connecting portion 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 support plate 32; when the second end of the support portion 52 slides on the surface of the support plate 32 to a preset position, the elastic colloid is used to abut against the second end of the support portion 52 to apply an elastic resistance to the second end of the support portion 52 to prevent the second end of the support portion 52 from continuing to slide relative to the support plate 32.

[0089] The elastic colloid in this embodiment can intervene when the reaction plate spring 5 deforms to a certain extent (i.e., after the reaction plate 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 assembly 6), so as to further provide a reverse elastic force for the moving contact plate 2, make the moving contact plate 2 further closely adhere to the static contact 1, so as 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 gradually increasing in the third direction, and the third direction is the sliding direction of the second end of the support portion 52 on the surface of the support plate 32, so as to provide a gradually increasing reverse elastic force for the moving contact plate 2 during the movement of the second end of the support portion 52 and better realize the gradient growth of the reverse elastic force.

[0090] Among them, the elastic colloid can be made of an insulating material. When 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, the elastic colloid can be correspondingly arranged between the second end of the support portion 52 and the central spring 4. In this way, while the elastic colloid further provides a reverse elastic force, it can also form a blocking effect between the support portion 52 and the central spring 4, so as to avoid the second end of the support portion 52 moving excessively on the surface of the support plate 32 and making accidental contact with the central spring 4 under the action of some uncontrollable factors.

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

[0092] When the static contact 1 is separated 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 static contact 1 contacts the moving contact plate 2, the moving contact plate 2 is separated from the limiting member 7.

[0093] By setting the limiting member 7, the central spring 4 can be in a pre-compressed state and have a certain amount of elastic potential energy; when the moving contact plate 2 contacts the static contact 1, the limiting member 7 continues to move upward and is separated from the moving contact plate 2 under the drive of the push rod assembly 3. At this time, the pre-compressed central spring 4 can directly release the stored elastic potential energy to the static 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 completely closed moving contact plate 2 from zero, so that the change trend of the reverse elastic force can be more adapted to the change 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 to press against the limiting member 7 through the central spring 4, the position stability of the moving contact plate 2 during the contact closing operation process can be ensured, and the lateral position deviation of the moving contact plate 2 relative to the push rod assembly 3 during the upward movement can be avoided due to the moving contact plate 2 being only restricted by the central spring 4.

[0095] In one embodiment, referring to Figure 7 and Figure 8 , the bridge circuit anti-short circuit structure further includes a yoke 8, and the yoke 8 is connected to the side of the moving contact plate 2 facing away from the static contact 1, and the reaction plate spring 5 is arranged 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 plate spring 5 to press the reaction plate spring 5 against the yoke 8.

[0096] In this embodiment, after the moving contact of the moving contact plate 2 is closed with the static contact 1, the current passing through the moving contact can magnetize the yoke 8, causing a magnetic attractive force to be generated between the yoke 8 and another magnetic yoke above. This magnetic attractive force will drive the moving contact plate 2 to press tightly against the static contact 1, restricting the separation movement between the moving contact plate 2 and the static contact 1, thereby making the closure of the moving contact and the static contact 1 more stable and reliable, and further improving the resistance to the repulsive force generated by a large current during a short circuit.

[0097] When the yoke 8 is provided on the moving contact plate 2, in some embodiments, the reaction piece spring 5 can be arranged as shown in Figure 4 and Figure 6 between the moving contact plate 2 and the yoke 8; in other embodiments, the reaction piece spring 5 can be arranged as shown in Figure 7 and Figure 8 on the side of the yoke 8 facing away from the moving contact plate 2 and abutting 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 piece spring 5 tightly against the surface of the yoke 8, so that the relative fixation between the reaction piece spring 5 and the moving contact plate 2 can be conveniently achieved by means of the central spring 4.

[0098] The embodiment of the present invention also provides a relay. Please refer to Figures 1 to 8 , and this relay includes the bridge circuit anti-short-circuit structure in any of the above embodiments.

[0099] Regarding the specific structure of the bridge circuit anti-short-circuit structure, reference can be made to the above embodiments. Since this relay adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, that is, without increasing the size and power of the induction coil in the electromagnetic component 6, but providing a reverse elastic force for the moving contact plate 2 through the sequential intervention of the central spring 4 and the reaction piece spring 5. This reverse elastic force adapts to the changing characteristics of the electromagnetic adsorption force generated by the electromagnetic component 6, which is small first and then large. Under the condition of ensuring the normal progress of the contact closing operation, a relatively large contact pressure can be obtained between the moving contact plate 2 and the static contact 1, so as to resist the repulsive force generated when the relay withstands a short-circuit current and improve the working stability of the relay.

[0100] It should be noted that other contents of the bridge circuit anti-short-circuit structure and the relay disclosed in the present invention can be referred to the prior art and will not be elaborated here.

[0101] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A bridge loop anti-short circuit structure, characterized in that: The bridge loop anti-short circuit structure comprises: static contact(1); A moving touch plate (2), the moving touch plate (2) being arranged opposite to the stationary contact point (1); Push rod assembly (3); a central spring (4), wherein a first end of the central spring (4) is connected to the push rod assembly (3), and a second end of the central spring (4) is connected to the moving touch plate (2); A reaction leaf spring (5), wherein the reaction leaf spring (5) is connected to the movable touch plate (2), and a preset distance exists between the reaction leaf spring (5) and the push rod assembly (3); An electromagnetic assembly (6), wherein the electromagnetic assembly (6) is connected to the push rod assembly (3); when the static contact (1) is separated from the movable contact plate (2), the electromagnetic assembly (6) is used to drive the push rod assembly (3) to approach the static contact (1) so that the movable contact plate (2) abuts against the static contact (1), thereby applying a first pressing force toward the static contact (1) to the movable contact plate (2) through the elastic force of the central spring (4); after the static contact (1) contacts the movable contact plate (2), the electromagnetic assembly (6) is used to continue to drive the push rod assembly (3) to approach the static contact (1) so that the push rod assembly (3) abuts against the reaction leaf spring (5), thereby applying a second pressing force toward the static contact (1) to the movable contact plate (2) through the elastic force of the reaction leaf spring (5).

2. The bridge loop anti-short circuit structure according to claim 1, characterized in that: The reaction leaf spring (5) comprises a connecting portion (51) and a supporting portion (52), wherein the connecting portion (51) is connected to the movable touch plate (2), the supporting portion (52) extends along a first direction, a first end of the supporting portion (52) is connected to the connecting portion (51), and a second end of the supporting portion (52) is used to abut against the push rod assembly (3).

3. The bridge loop anti-short circuit structure according to claim 2, characterized in that: The bridge loop anti-short circuit structure comprises at least two reaction force leaf springs (5), and the at least two reaction force leaf springs (5) are arranged at intervals around the central spring (4).

4. The bridge loop anti-short circuit structure according to claim 3, characterized in that: The connecting parts (51) of at least two of the reaction force leaf springs (5) are connected to form an integrated structure.

5. The bridge loop anti-short circuit structure according to claim 2, characterized in that: The direction in which the push rod assembly (3) approaches the static 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 loop anti-short circuit structure according to claim 5, characterized in that: The distance between the first end of the support portion (52) and the central axis of the push rod assembly (3) is smaller than the distance between the second end of the support portion (52) and the central axis of the push rod assembly (3); Alternatively, 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).

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

8. The bridge loop anti-short circuit structure according to claim 1, characterized in that: The push rod assembly (3) comprises 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 leaf spring (5); when the static contact (1) contacts the moving contact plate (2), the electromagnetic assembly (6) is used to drive the push rod body (31) to approach the static contact (1) so that the support plate (32) abuts against the reaction leaf spring (5); And / or, the bridge loop anti-short circuit structure also includes a limiter (7), and the limiter (7) is connected to the push rod assembly (3); when the static contact (1) is separated from the moving touch plate (2), the moving touch plate (2) abuts against the limiter (7) under the elastic force of the central spring (4); when the static contact (1) is in contact with the moving touch plate (2), the moving touch plate (2) is separated from the limiter (7).

9. The bridge loop anti-short circuit structure according to claim 1, characterized in that: The bridge loop anti-short circuit structure also includes a yoke (8), the yoke (8) is connected to the side of the moving contact plate (2) facing away from the static contact (1), and the reaction leaf spring (5) is arranged 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 leaf spring (5) to press the reaction leaf spring (5) onto the yoke (8).

10. A relay, characterized in that: The relay comprises a bridge circuit anti-short circuit structure as claimed in any one of claims 1 to 9.

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