A relay with high short circuit resistance

Abstract

The present invention relates to a relay with high short-circuit resistance. On the anti-short-circuit structure, a magnetic conductive part is placed in the magnetic circuit generated by the fault current to reduce the magnetic resistance of the magnetic circuit generated by the current, enhance the magnetic induction intensity of the interaction between the same-direction current or the reverse current, and increase the mutual Ampere force. Furthermore, without adjusting the spacing between the same-direction current or the reverse current and without increasing the length of the current-carrying conductor, the Ampere force of the same-direction current or the reverse current can be increased to improve the ability to resist short circuits, reduce the copper loss of the conductive circuit, and reduce the volume of the product. The magnetic conductive part can be implemented in the form of a variety of different structures, and can be in contact with or non-contact with the dynamic spring assembly. Among them, it can be implemented as a layer of sub-spring of a dynamic spring with a multi-layer structure. As a part of the dynamic spring, it can directly participate in the conduction while realizing magnetic conductivity. The magnetic conductive part of the present invention has a simple structure and is easy to install. It will not increase the production cost and will not affect the production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and more particularly to a relay with high short-circuit resistance. Background Art

[0002] Relays are generally composed of a magnetic circuit system, a contact system, a driving part and a base. The magnetic circuit system is generally composed of two basically symmetrical magnetic circuits, including a stationary magnetic conductive part, a movable magnetic conductive part and a coil. The contact system includes a movable spring assembly and a static spring part. The driving part is generally played by a driving card. When a positive pulse voltage is passed through the relay coil, the magnetic circuit system works, and the driving card pushes the movable spring part to make the contacts contact and the relay operates. When a reverse pulse voltage is passed through the coil, the magnetic circuit system works, and the driving card pushes the movable spring part to disconnect the contacts and reset the relay. Figure 1 , Figure 2 As shown, in the design of traditional contact systems, the purpose of resisting fault current is achieved by utilizing the principle that opposite currents repel each other and currents in the same direction attract each other between the moving spring sheet and the moving spring lead-out sheet in the moving spring assembly, or between the moving spring sheets of different moving spring assemblies, that is, an anti-short-circuit structure is provided in the moving spring assembly or between the moving spring assemblies.

[0003] But when the fault current is large, such as Figure 3 As shown, the contact repulsion between contacts due to the contraction current becomes larger. According to the prior art, if one wants to overcome the defect of the increased contact repulsion due to the contraction current, the only way is to reduce the spacing between the same-direction current or the reverse current, or increase the length of the relative current-carrying conductor to increase the Ampere force, thereby offsetting the problem of contact pop-up failure caused by the contact repulsion.

[0004] In reality, the spacing between current-carrying conductors of the same or opposite current is very limited due to the restrictions of contact gap and space, and the space available for adjustment is very limited; and increasing the length of the relative current-carrying conductor will increase the copper loss and body resistance of the circuit, which is not conducive to the miniaturization of the product.

[0005] This solution can increase the Ampere force of the same or reverse current without increasing the length of the current-carrying conductor, thereby reducing the copper loss of the conductive circuit and reducing the volume of the product under extreme fault current conditions. Summary of the invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide a relay with high short-circuit resistance, which can increase the Ampere force of the same-direction current or the reverse current without adjusting the spacing between the same-direction current or the reverse current and without increasing the length of the current-carrying conductor, so as to improve the ability to resist short circuits, reduce the copper loss of the conductive circuit, and reduce the volume of the product.

[0007] The technical solution of the present invention is as follows:

[0008] A highly short-circuit-resistant relay comprises a magnetic circuit system, a driving component and a contact system. The contact system comprises a dynamic spring component and a static spring component. The dynamic spring component and the static spring component serve as current carriers and form an anti-short-circuit structure. A magnetic circuit is formed in the dynamic spring component or between the dynamic spring components. A magnetic conductive member is provided on one side of the dynamic spring component facing outward in the thickness direction or on one of the outer sides of the dynamic spring components facing away from each other in the thickness direction, so as to reduce the magnetic resistance of the magnetic circuit generated by the current, enhance the magnetic induction intensity of the interaction between the same-direction current or the reverse current loaded on the current carrier, and enhance the Ampere force between the current carriers.

[0009] Preferably, when a magnetic circuit is formed inside the dynamic spring assembly, the dynamic spring assembly is provided with current carriers arranged side by side for loading reverse current, and the magnetic conductive member is arranged on one side of one of the current carriers, away from the other current carrier.

[0010] Preferably, the movable spring assembly includes a first movable spring piece, a first movable contact, and a first movable spring lead-out piece, and the static spring assembly includes a static spring piece and a first static contact; the first movable spring piece and the static spring piece are respectively arranged at matching positions, one end of the first movable spring piece is connected to one end of the first movable spring lead-out piece, and the first movable contact is arranged at the other end of the first movable spring piece, which is located on a side away from the first movable spring lead-out piece; the first static contact corresponds to the first movable contact and is arranged on the static spring piece;

[0011] A magnetic circuit is formed in the movable spring assembly, and the magnetic conductive member is arranged on the first movable spring piece, on the same side as the first movable contact; or, the magnetic conductive member is arranged on the side of the first movable spring lead-out piece away from the first movable spring piece.

[0012] Preferably, the first movable spring piece or the first movable spring lead-out piece provided with the magnetic conductive member is slotted to form multiple parallel conductive loops, wherein several conductive loops or each conductive loop is provided with the magnetic conductive member.

[0013] Preferably, when a magnetic circuit is formed between the dynamic spring assemblies, the dynamic spring assemblies include current carriers arranged side by side for carrying current in the same direction, and the magnetic conductive member is arranged on one side of one of the current carriers, away from the other current carrier.

[0014] Preferably, a movable spring assembly 1 and a movable spring assembly 2 are provided, wherein the movable spring assembly 1 includes a second movable spring lead-out piece, a second movable spring piece, and a second movable contact, the movable spring assembly 2 includes a third movable spring lead-out piece, a third movable spring piece, and a third movable contact, and the static spring assembly includes a second static contact and a third static contact; one end of the second movable spring piece is connected to one end of the second movable spring lead-out piece, and a second static contact is provided, and the second movable contact is provided at the other end of the second movable spring piece; the third movable contact is provided at one end of the third movable spring piece, corresponding to the second static contact, and the other end of the third movable spring piece is connected to one end of the third movable spring lead-out piece, and a third static contact is provided, corresponding to the second movable contact;

[0015] A magnetic circuit is formed between the first moving contact assembly and the second moving contact assembly. The magnetic conductive member is disposed on the side of the second moving contact piece and the third moving contact piece facing away from each other, or the magnetic conductive member is disposed on the side of the third moving contact piece and the second moving contact piece facing away from each other.

[0016] Preferably, the second moving contact piece or the third moving contact piece provided with the magnetic conductive member forms a multi-path parallel conductive circuit through slotting, and a magnetic conductive member is correspondingly disposed on several paths of the conductive circuits or each path of the conductive circuits.

[0017] Preferably, the magnetic conductive member is a magnetic conductive cover with a "C"-shaped cross-section, which is disposed on the current carrier in a three-sided covering manner.

[0018] Preferably, the magnetic conductive member is a sheet-like reed structure and is disposed on the moving contact piece.

[0019] Preferably, the first moving contact piece, the second moving contact piece or the third moving contact piece includes several sub-reed pieces, and the magnetic conductive member serves as one layer of the sub-reed pieces and is integrally arranged with the remaining sub-reed pieces.

[0020] The beneficial effects of the present invention are as follows:

[0021] For the relay with high short-circuit resistance described in the present invention, by placing the magnetic conductive member into the magnetic circuit generated by the fault current on the short-circuit resistance structure, the magnetic resistance of the magnetic circuit generated by the current is reduced, the magnetic induction intensity of the interaction between the co-directional currents or the reverse currents is enhanced, and the Ampere force between them is increased. Furthermore, without adjusting the distance between the co-directional currents or the reverse currents and without increasing the length of the current-carrying conductor, the Ampere force of the co-directional currents or the reverse currents can be increased, so as to improve the short-circuit resistance ability, reduce the copper loss of the conductive circuit, and reduce the volume of the product.

[0022] The magnetic conductive member can be implemented in various different structural forms, and can be in contact or non-contact with the moving contact assembly. Among them, it can be implemented as a magnetic conductive cover, which is disposed on the current carrier in a three-sided covering manner; it can be implemented as a sheet-like reed structure and is disposed on the moving contact piece; it can be implemented as one layer of the sub-reed pieces of the multi-layer structure of the moving contact piece, and as a part of the moving contact piece, it can directly participate in conduction while realizing magnetic conduction. In the present invention, the structure of the magnetic conductive member is simple, the installation is convenient, the production cost will not be increased, and the production efficiency will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the prior art for forming a magnetic circuit of co-directional currents;

[0024] Figure 2 is a schematic structural diagram of the prior art for forming a magnetic circuit of reverse currents;

[0025] Figure 3 is a schematic diagram showing that the contact repulsive force becomes larger due to the shrinking current;

[0026] Figure 4 It is a structural schematic diagram of the first embodiment (the magnetic conductive member is arranged on the first movable spring piece);

[0027] Figure 5 1 is a schematic diagram of the structure of the contact system of the first embodiment (the magnetic conductive member is arranged on the first movable spring lead-out piece);

[0028] Figure 6 It is a structural schematic diagram of the magnetic shield;

[0029] Figure 7 yes Figure 4 A cross-sectional view at the location of the magnetic conductive element (showing the direction of the current and the direction of the magnetic field);

[0030] Figure 8 yes Figure 5 A cross-sectional view at the location of the magnetic conductive element (showing the direction of the current and the direction of the magnetic field);

[0031] Fig. 9 is a schematic structural diagram of the movable spring assembly of the first embodiment (the first movable spring piece is slotted);

[0032] Fig.10 It is a structural schematic diagram of the dynamic spring assembly of the first embodiment (the first dynamic spring lead-out piece is slotted);

[0033] Fig.11 It is a structural schematic diagram of the second embodiment (the magnetic conductive member is arranged on the second movable spring);

[0034] Fig.12 It is a structural schematic diagram of the second embodiment (the magnetic conductive member is arranged on the third movable spring piece);

[0035] Fig.13 yes Fig.11 A cross-sectional view at the location of the magnetic conductive element (showing the direction of the current and the direction of the magnetic field);

[0036] Fig.14 yes Fig.12 A cross-sectional view at the location of the magnetic conductive element (showing the direction of the current and the direction of the magnetic field);

[0037] In the figure: 11 is the first moving reed, 12 is the second moving reed, 13 is the third moving reed, 21 is the first moving contact, 22 is the second moving contact, 23 is the third moving contact, 31 is the first moving spring lead-out piece, 32 is the second moving spring lead-out piece, 33 is the third moving spring lead-out piece, 41 is the static reed, 51 is the first static contact, 52 is the second static contact, 53 is the third static contact, 60 is the magnetic conductive part, 70 is the magnetic circuit system, and 80 is the driving component. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0039] A relay with high short-circuit resistance, such as Figure 4 , Fig.11 As shown, it includes a magnetic circuit system 70, a pushing assembly 80, and a contact system. The contact system includes a dynamic spring assembly and a static spring assembly. The dynamic spring assembly and the static spring assembly serve as current carriers and form an anti-short circuit structure. A magnetic circuit is formed in the dynamic spring assembly or between the dynamic spring assembly and the static spring assembly. The principle of the anti-short circuit structure is as follows: through the structural design of the dynamic spring assembly and the static spring assembly, the current flowing through the dynamic spring assembly (between the dynamic spring lead-out piece of the same dynamic spring assembly) or between the dynamic spring assemblies (between the dynamic spring leaves of different dynamic spring assemblies) is opposite or the same in direction, so that the cooperation between the dynamic spring lead-out piece and the dynamic spring leaf and / or the cooperation between the dynamic spring leaf and the dynamic spring leaf can be used to form the Ampere force generated by the short-circuit current on the dynamic spring leaf to jointly resist the electromotive repulsion generated by the short-circuit current between the dynamic and static contacts.

[0040] In the present invention, a magnetic conductive member 60 (made of magnetic conductive soft magnetic material) is provided on one side of the movable spring assembly facing outward in the thickness direction or on one of the outer sides of the movable spring assemblies facing away from each other in the thickness direction, so as to reduce the magnetic resistance of the magnetic circuit generated by the current, enhance the magnetic induction intensity of the interaction between the same-direction current or the reverse current loaded on the current carrier, and enhance the Ampere force between the current carriers; furthermore, the contact repulsion can be offset and the problem of contact bounce (connection failure) caused by the contact repulsion can be improved.

[0041] For the same requirement of counteracting contact repulsion, different anti-short-circuit structures correspond to different current direction requirements, but in theory, in the anti-short-circuit structure, the current direction formed on the relative current-carrying conductors, whether it is the same direction current or the reverse current, can correspondingly counteract the contact repulsion. That is, whether it is the same direction current or the reverse current, in each anti-short-circuit structure, the contact repulsion generated by the short-circuit current can be counteracted.

[0042] Embodiment 1

[0043] When a magnetic circuit is formed in the dynamic spring assembly, the dynamic spring assembly is provided with current carriers arranged side by side for loading reverse current, and the magnetic conductive member 60 is arranged on one side of one of the current carriers, away from the other current carrier.

[0044] Specifically, Figure 4 , Figure 5As shown in the figure, the moving spring component includes a first moving spring piece 11, a first moving contact 21, and a first moving spring lead piece 31, and the static spring component includes a static spring piece 41 and a first static contact 51; the first moving spring piece 11 and the static spring piece 41 are respectively arranged at adapted positions, one end of the first moving spring piece 11 is connected to one end of the first moving spring lead piece 31, and the first moving contact 21 is arranged at the other end of the first moving spring piece 11, on the side away from the first moving spring lead piece 31; the first static contact 51 corresponds to the first moving contact 21 and is arranged on the static spring piece 41. When current flows in from the first moving spring lead piece 31, the current directions on the first moving spring piece 11 and the first moving spring lead piece 31 are opposite. Then, according to the principle that reverse currents attract each other, the movement tendency of mutual contact between the first moving contact 21 and the first static contact 51 is enhanced, and the contact repulsive force can be offset.

[0045] In the described structure, a magnetic circuit is formed in the moving spring component. As Figure 4 shown, the magnetic conductive part 60 is arranged on the first moving spring piece 11, on the same side as the first moving contact 21, that is, on the side close to the first static contact 51; or, as Figure 5 shown, the magnetic conductive part 60 is arranged on the side of the first moving spring lead piece 31 away from the first moving spring piece 11, that is, on the side away from the first static contact 51.

[0046] In this embodiment, as Figure 6 shown, the magnetic conductive part 60 is a magnetic conductive cover with a "C"-shaped cross-section, which covers the current carrier in a three-sided manner. As Figure 7 、 Figure 8 shown, after the current carrier is energized, the generated magnetic field propagates along the "C"-shaped magnetic conductive cover, so that the magnetic resistance of the magnetic circuit generated by the current can be reduced, the magnetic induction intensity of the interaction between the reverse currents applied to the current carrier can be enhanced, and the Ampere force between the current carriers can be enhanced.

[0047] In this embodiment, the first moving spring piece 11 or the first moving spring lead piece 31 provided with the magnetic conductive part 60 forms a multi-path parallel conductive circuit through slotting, and a magnetic conductive part 60 is correspondingly arranged for several paths of conductive circuits or each path of conductive circuits. As Fig. 9 shown, as an implementation manner, the first moving spring piece 11 forms two associated conductive circuits through one slotting, and a magnetic conductive cover is arranged before and after the arc surface of each path of conductive circuit on the first moving spring piece 11. As Fig.10 shown, as another implementation manner, the first moving spring lead piece 31 forms two associated conductive circuits through one slotting, and a magnetic conductive cover is arranged for both paths of conductive circuits.

[0048] As another implementation manner, the magnetic conductive part 60 can be implemented as a sheet-shaped spring structure and arranged on the first moving spring piece 11.

[0049] As another implementation manner, the first moving reed 11 includes a plurality of sub-reeds. The magnetic conductive member 60 serves as one layer of sub-reeds, is provided integrally with the remaining sub-reeds, and serves as a part of the first moving reed 11. While achieving magnetic conduction, it can directly participate in conduction or not participate in conduction.

[0050] Embodiment 2

[0051] The difference between this embodiment and Embodiment 1 lies in the different structures for forming the magnetic circuit. Correspondingly, the anti-short-circuit routes are also different. In this embodiment, when a magnetic circuit is formed between the moving reed assemblies, the moving reed assemblies include current carriers arranged side by side for loading同向 current, and the magnetic conductive member 60 is arranged on one side of one current carrier and is背离 from the other current carrier.

[0052] Specifically, as Fig.11 、 Fig.12 shown, a first moving reed assembly and a second moving reed assembly are provided. The first moving reed assembly includes a second moving reed lead-out piece 32, a second moving reed 12, and a second moving contact 22. The second moving reed assembly includes a third moving reed lead-out piece 33, a third moving reed 13, and a third moving contact 23. The static reed assembly includes a second static contact 52 and a third static contact 53. One end of the second moving reed 12 is connected to one end of the second moving reed lead-out piece 32, and the second static contact 52 is provided. The second moving contact 22 is arranged at the other end of the second moving reed 12. The third moving contact 23 is arranged at one end of the third moving reed 13 and corresponds to the second static contact 52. The other end of the third moving reed 13 is connected to one end of the third moving reed lead-out piece 33, and the third static contact 53 is provided and corresponds to the second moving contact 22. When current flows in from the second moving reed lead-out piece 32, the current directions on the second moving reed 12 and the third moving reed 13 are the same. Then, according to the principle that同向 current attracts each other, the movement tendency of the second moving contact 22 and the second static contact 52, and the third moving contact 23 and the third static contact 53 to contact each other is enhanced, and the contact repulsive force can be抵消.

[0053] In the described structure, a magnetic circuit is formed between the first moving reed assembly and the second moving reed assembly. As Fig.11 shown, the magnetic conductive member 60 is arranged on the side背离 from the second moving reed 12 and the third moving reed 13; or, as Fig.12 shown, the magnetic conductive member 60 is arranged on the side背离 from the third moving reed 13 and the second moving reed 12.

[0054] In this embodiment, as Fig.13 、 Fig.14 shown, after the current carriers are energized, the generated magnetic field propagates along the "匚"-shaped magnetic conductive cover, which can reduce the magnetic resistance of the magnetic circuit generated by the current, enhance the magnetic induction intensity of the interaction between the同向 currents loaded on the current carriers, and enhance the Ampere force between the current carriers.

[0055] In this embodiment, the second movable spring piece 12 or the third movable spring piece 13 provided with the magnetic conductive member 60 forms multiple parallel conductive loops through slotting, wherein several conductive loops or each conductive loop is correspondingly provided with the magnetic conductive member 60 .

[0056] As another implementation, the magnetic conductive member 60 may be implemented as a sheet-shaped reed structure, and disposed on the second movable reed 12 or the third movable reed 13 .

[0057] As another embodiment, the second movable reed 12 or the third movable reed 13 includes a plurality of sub-reeds, and the magnetic conductive member 60 is one layer of the sub-reeds, which is integrated with the remaining sub-reeds and serves as a part of the second movable reed 12 or the third movable reed 13. While realizing magnetic conductivity, it can directly participate in electrical conduction or not.

[0058] The other parts are the same as those in the first embodiment.

[0059] The above embodiments are only used to illustrate the present invention, and are not used to limit the present invention. As long as they are based on the technical essence of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A highly short-circuit-resistant relay, comprising a magnetic circuit system, a driving assembly, and a contact system, wherein the contact system comprises a dynamic spring assembly and a static spring assembly, the dynamic spring assembly and the static spring assembly serve as current carriers and form an anti-short-circuit structure, and a magnetic circuit is formed in the dynamic spring assembly or between the dynamic spring assemblies; characterized in that: One side of the moving contact assembly facing outward in the thickness direction or one of the outer sides of the moving contact assemblies facing away from each other in the thickness direction is provided with a magnetic conductive member, which is used to reduce the magnetic resistance of the magnetic circuit generated by the current, enhance the magnetic induction intensity of the interaction between the同向 currents or反向 currents applied to the current carriers, and enhance the Ampere force between the current carriers.

2. The high short-circuit resistant relay according to claim 1, characterized in that: When a magnetic circuit is formed in the moving contact assembly, the moving contact assembly is provided with current carriers arranged side by side for loading reverse currents, and the magnetic conductive member is arranged on one side of one of the current carriers, facing away from the other current carrier.

3. The high short-circuit resistant relay according to claim 2, characterized in that: The moving contact assembly includes a first moving contact spring, a first moving contact, and a first moving contact lead-out piece, and the static contact assembly includes a static contact spring and a first static contact; the first moving contact spring and the static contact spring are respectively arranged at adapted positions, one end of the first moving contact spring is connected to one end of the first moving contact lead-out piece, and the first moving contact is arranged at the other end of the first moving contact spring, on the side facing away from the first moving contact lead-out piece; the first static contact corresponds to the first moving contact and is arranged on the static contact spring; A magnetic circuit is formed in the moving contact assembly, and the magnetic conductive member is arranged on the first moving contact spring, on the same side as the first moving contact; or, the magnetic conductive member is arranged on the side of the first moving contact lead-out piece facing away from the first moving contact spring.

4. The high short-circuit resistant relay according to claim 3, characterized in that: The first moving contact spring or the first moving contact lead-out piece provided with the magnetic conductive member forms a multi-path parallel conductive circuit through slotting, and a magnetic conductive member is correspondingly arranged on several paths or each path of the conductive circuits.

5. The high short-circuit resistant relay according to claim 1, characterized in that: When a magnetic circuit is formed between the moving contact assemblies, the moving contact assemblies include current carriers arranged side by side for loading同向 currents, and the magnetic conductive member is arranged on one side of one of the current carriers, facing away from the other current carrier.

6. The high short-circuit resistant relay according to claim 5, characterized in that: The first moving contact assembly and the second moving contact assembly are provided. The first moving contact assembly includes a second moving contact lead-out piece, a second moving contact spring, and a second moving contact, and the second moving contact assembly includes a third moving contact lead-out piece, a third moving contact spring, and a third moving contact. The static contact assembly includes a second static contact and a third static contact; one end of the second moving contact spring is connected to one end of the second moving contact lead-out piece, and the second static contact is arranged. The second moving contact is arranged at the other end of the second moving contact spring; the third moving contact is arranged at one end of the third moving contact spring, corresponding to the second static contact. The other end of the third moving contact spring is connected to one end of the third moving contact lead-out piece, and the third static contact is arranged, corresponding to the second moving contact; A magnetic circuit is formed between the first moving contact assembly and the second moving contact assembly, and the magnetic conductive member is arranged on the side of the second moving contact spring facing away from the third moving contact spring, or, the magnetic conductive member is arranged on the side of the third moving contact spring facing away from the second moving contact spring.

7. The high short-circuit resistant relay according to claim 6, characterized in that: The second moving contact spring or the third moving contact spring provided with the magnetic conductive member forms a multi-path parallel conductive circuit through slotting, and a magnetic conductive member is correspondingly arranged on several paths or each path of the conductive circuits.

8. The high short-circuit resistant relay according to any one of claims 1 to 7, characterized in that: The magnetic conductive member is a magnetic conductive cover with a "匚"-shaped cross-section, which covers the current carrier on three sides.

9. The high short-circuit resistant relay according to any one of claims 1 to 7, characterized in that: The magnetic conductive member is a sheet-like spring structure and is arranged on the moving contact spring.

10. The high short-circuit resistant relay according to any one of claims 1 to 7, characterized in that: The first moving contact spring, the second moving contact spring, or the third moving contact spring includes several sub-springs, and the magnetic conductive member serves as one layer of the sub-springs and is arranged integrally with the remaining sub-springs.

Images