High-low voltage isolation anti-short circuit structure of direct current relay

Abstract

The utility model discloses a kind of high-low voltage isolation anti-short circuit structure of direct-current relay, comprising: upper armature, lower armature and armature support piece, upper armature and lower armature can be magnetized and mutually attracted under the magnetic field formed when current flows through the contact of direct-current relay, to provide additional contact pressure for direct-current relay;Armature support piece includes armature support and insulating plastic piece, armature support is provided with multiple support legs and the fixed transverse plate of fixed connection on the upper end of multiple support legs, the avoiding hole is opened on fixed transverse plate, insulating plastic piece is covered in fixed transverse plate and the hole wall of avoiding hole, while insulating plastic piece is provided with riveting hole corresponding to avoiding hole, upper armature is riveted and fixed in insulating plastic piece, and upper armature is completely isolated with armature support by insulating plastic piece. The utility model can guarantee the anti-short circuit capability of direct-current relay, simplify process, reduce cost, and realize the reliable isolation of high-low voltage end.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, and in particular to a high and low voltage isolation and short-circuit protection structure for a DC relay. Background Technology

[0002] DC relays, as key control components in power systems, are widely used in new energy vehicles, energy storage systems, and other fields. Their reliability directly affects the safe operation of the entire system. In practical applications, DC relays not only need to have good short-circuit current withstand capability, but also need to meet the reliable isolation requirements between high and low voltage terminals.

[0003] Currently, the conventional practice is to install a lower armature on the moving contact and place an upper armature above the lower armature. When the contact conducts current, a magnetic field is generated, which magnetizes the upper and lower armatures, causing them to attract each other. This provides an upward compensating force on the moving contact, thereby increasing the contact pressure and improving the short-circuit current withstand capability.

[0004] However, existing technologies have many shortcomings in the design of short-circuit protection structures for DC relays. For example, utility model patent CN216528650U discloses a short-circuit current protection contact structure, in which the first magnetic conductor is mounted on a magnetic plate via a first fixed bracket, and the second magnetic conductor is mounted on a moving contact piece. Since the first magnetic conductor is at the low-voltage end and the second magnetic conductor is at the high-voltage end, a breakdown between high and low voltages is very likely to occur, causing damage to the contactor and seriously affecting the safe operation of the equipment. The withstand voltage performance is also difficult to meet the requirements of high-voltage scenarios.

[0005] Another existing technology, such as the utility model patent with patent publication number CN221861537U, discloses a relay in which the first magnetic conductor is fixed inside the insulating cover through the connecting part. On the one hand, the brazing process between the insulating cover and the connecting part is complex, requires extremely high processing precision, and has the risk of air leakage, which affects the sealing performance and service life of the relay. On the other hand, the additional connecting part and matching brazing sheet increase the production and manufacturing cost.

[0006] Therefore, it is necessary to improve existing technologies to overcome their shortcomings. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a high-low voltage isolation and short-circuit protection structure for DC relays, which simplifies the process, reduces costs, and achieves reliable isolation between high and low voltage terminals while ensuring the short-circuit protection capability of DC relays.

[0008] The technical solution adopted by this utility model to solve its technical problem is: a high and low voltage isolation and short-circuit protection structure for a DC relay, comprising: an upper armature, a lower armature, and an armature support. The upper armature and the lower armature are magnetized and attracted to each other by the magnetic field formed when current flows through the contacts of the DC relay, thereby providing additional contact pressure for the DC relay. The armature support includes an armature bracket and an insulating plastic component. The armature bracket is provided with multiple support legs and a fixed horizontal plate fixedly connected to the upper end of the multiple support legs. The fixed horizontal plate is provided with clearance holes. The insulating plastic component covers the fixed horizontal plate and the hole wall of the clearance holes. At the same time, the insulating plastic component is provided with riveting holes corresponding to the clearance holes. The upper armature is riveted and fixed to the insulating plastic component, and the upper armature is completely isolated from the armature bracket through the insulating plastic component.

[0009] As a further improvement of this utility model, the insulating plastic part extends downward near both ends to form an isolation platform, the isolation platform is located between the upper armature and the support leg, and the width of the isolation platform is not less than the width of the upper armature.

[0010] As a further improvement of this utility model, the portion of the insulating plastic part covering the armature bracket does not include multiple support legs.

[0011] As a further improvement of this utility model, the insulating plastic part and the armature bracket are integrally formed by insert injection molding.

[0012] As a further improvement of this utility model, the armature bracket is integrally stamped from a metal sheet with a thickness of 0.5~1.2mm.

[0013] As a further improvement of this utility model, when the insulating plastic part covers the fixed horizontal plate, the covering thickness on one side of the fixed horizontal plate is 0.5~1mm.

[0014] As a further improvement of this utility model, the upper armature is composed of several armature pieces stacked together, and each armature piece is provided with a through hole opposite to the riveting hole. Rivets are inserted into the riveting hole and the through hole to rivet and fix the several armature pieces to the insulating plastic part.

[0015] As a further improvement of this utility model, there are two or more riveting holes, and the number of through holes opened on each armature piece is the same as the number of riveting holes and they correspond one-to-one.

[0016] As a further improvement of this utility model, the DC contactor includes a magnetic plate, and the lower ends of the plurality of support legs are bent to form mounting feet, and the mounting feet are fixedly riveted to the magnetic plate.

[0017] As a further improvement of this utility model, the DC contactor also includes a push rod assembly and a moving contact piece. The lower armature is U-shaped, and the moving contact piece passes through the lower armature. At the same time, both the moving contact piece and the lower armature are mounted on the push rod assembly, and the upper armature is located directly above the lower armature.

[0018] The beneficial effects of this utility model are as follows: This utility model provides a high and low voltage isolation and short-circuit protection structure for a DC relay. By setting an armature support component composed of an armature bracket and an insulating plastic part, the insulating plastic part covers the fixing cross plate and the wall of the clearance hole of the armature bracket, and the upper armature is riveted to the insulating plastic part and completely isolated from the armature bracket. On the one hand, reliable electrical isolation between the upper armature and the armature bracket is achieved, effectively avoiding the risk of breakdown between high and low voltage and improving the withstand voltage performance of the DC relay. On the other hand, the upper and lower armatures can attract each other under the action of the magnetic field formed by the contact current, providing additional pressure to the contacts and significantly enhancing the short-circuit protection capability of the relay. At the same time, compared with the complex process of brazing Kovar columns on the ceramic cover in the prior art, this structure achieves fixation through riveting and injection molding, which is simpler, reduces the risk of air leakage and the number of parts, and reduces production costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a perspective view of the assembly of the high and low voltage isolation and short-circuit protection structure and the internal structure of the DC relay of this utility model; Figure 2 This is a perspective view of the assembly of the upper armature, armature bracket and magnetic guide plate in this utility model; Figure 3 This is a cross-sectional view of the assembly of the upper armature, armature bracket and magnetic guide plate in this utility model; Figure 4 This is a front view of the DC relay of this utility model in the ON state.

[0021] Referring to the accompanying drawings, the following explanations are provided: 1. Upper armature; 2. Lower armature; 3. Armature bracket; 301. Support leg; 302. Fixed cross plate; 4. Insulating plastic parts; 401. Riveting hole; 402. Isolation platform; 5. Rivet; 6. Magnetic guide plate; 7. Push rod assembly; 8. Moving contact piece; 9. Stationary contact. Detailed Implementation

[0022] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0025] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0026] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0027] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0028] See Figures 1 to 4This utility model provides a high-low voltage isolation and short-circuit protection structure for a DC relay, comprising: an upper armature 1, a lower armature 2, and an armature support, wherein the armature support is used to fix the upper armature 1. The upper armature 1 and the lower armature 2 are configured such that when the DC relay is energized, i.e., the contacts of the DC relay are closed, a spiral magnetic field is generated when current flows through the moving contact 8, and under the action of this magnetic field, the upper armature 1 and the lower armature 2 can be magnetized and attract each other; since the upper armature 1 is fixed and held in place by the armature support, the attraction force of the upper armature 1 on the lower armature 2 can directly act on the moving contact 8, providing an upward compensating force on the moving contact 8, providing additional contact pressure for the DC relay to overcome the electrodynamic repulsion it receives, and improving its short-circuit protection performance.

[0029] Furthermore, the armature support includes an armature bracket 3 and an insulating plastic component 4. The armature bracket 3 is fixedly mounted on the magnetic plate 6 of the DC relay. The armature bracket 3 is provided with multiple support legs 301 and a fixed horizontal plate 302 fixedly connected to the upper end of the multiple support legs 301. The fixed horizontal plate 302 is provided with clearance holes. The insulating plastic component 4 covers the fixed horizontal plate 302 and the hole wall of the clearance holes. At the same time, the insulating plastic component 4 is provided with a riveting hole 401 corresponding to the clearance hole. The upper armature 1 is riveted and fixed to the bottom of the insulating plastic component 4, and the upper armature 1 is completely isolated from the armature bracket 3 through the insulating plastic component 4.

[0030] This invention features an armature support consisting of an armature bracket 3 and an insulating plastic part 4. The insulating plastic part 4 covers the fixing plate 302 and the wall of the clearance hole of the armature bracket 3, and the upper armature 1 is riveted to the insulating plastic part 4 and completely isolated from the armature bracket 3. This achieves reliable electrical isolation between the upper armature 1 and the armature bracket 3, effectively avoiding the risk of breakdown between high and low voltage and improving the withstand voltage performance of the DC relay. On the other hand, the upper armature 1 and the lower armature 2 can attract each other under the magnetic field generated by the contact current, providing additional pressure to the contacts and significantly enhancing the relay's short-circuit resistance. Furthermore, compared to the complex process of brazing Kovar columns onto a ceramic cover in the prior art, this structure achieves fixation through riveting and injection molding, which is simpler, reduces the risk of air leakage and the number of parts, and lowers production costs.

[0031] In this invention, the insulating plastic part 4 and the armature bracket 3 are integrally molded by insert injection molding, which ensures that the two are firmly connected without gaps and avoids the loosening or gaps caused during assembly, which would lead to a decrease in insulation performance. At the same time, the integral molding process simplifies the production process and improves production efficiency and structural consistency.

[0032] See Figure 2 The portion of the insulating plastic part 4 covering the armature bracket 3 does not include multiple support legs 301, which can reduce the amount of insulating plastic used, reduce material costs while ensuring insulation performance, and reduce the overall weight of the structure, making the DC relay structure more compact.

[0033] See Figure 3 The insulating plastic part 4 extends downwards near its left and right ends to form isolation platforms 402. The isolation platforms 402 are located between the upper armature 1 and the support leg 301, and the width of the isolation platforms 402 is not less than the width of the upper armature 1. This can effectively increase the creepage distance between the upper armature 1 and the armature bracket 3, further enhance the electrical isolation effect between the high and low voltage ends, avoid insulation failure caused by insufficient creepage distance, and improve the safety and reliability of the relay. At the same time, the isolation platforms 402 on the left and right sides can also play a preliminary positioning role for the installation of the upper armature 1.

[0034] In this utility model, the armature bracket 3 is integrally stamped from a metal sheet with a thickness of 0.5~1.2mm. On the one hand, the metal sheet stamping process is simple and low-cost, and it is not easy to produce burrs, which can prevent burrs from falling into the contact area and causing poor contact. On the other hand, the thin sheet structure is more tightly bonded to the insulating plastic, which can reduce glue leakage, ensure insulation reliability and structural stability, and improve the service life of the DC relay.

[0035] Preferably, when the insulating plastic part 4 covers the fixing plate 302, the covering thickness on one side of the fixing plate 302 is 0.5~1mm. This thickness can ensure sufficient insulation strength to meet the high and low voltage isolation requirements, and will not increase the amount of material used due to excessive thickness. It takes into account insulation performance, structural compactness and low cost.

[0036] Continue reading Figure 3 The upper armature 1 is formed by stacking several armature pieces in a vertical direction, and each armature piece has a through hole opposite to the riveting hole 401. Rivets 5 are inserted into the riveting hole 401 and the through hole to rivet and fix the several armature pieces to the insulating plastic part 4.

[0037] Among them, there are two or more riveting holes 401. The number of through holes opened on each armature piece is the same as the number of riveting holes 401 and they correspond one-to-one. This can make the upper armature 1 more evenly stressed, avoid local stress concentration or displacement caused by single-point riveting, ensure the accurate relative position of the upper armature 1 and the lower armature 2, and ensure the stability of the attraction force under the action of the magnetic field.

[0038] like Figure 1As shown, the DC contactor includes a ceramic cover (not shown in the drawing), a magnetic plate 6, a push rod assembly 7, a moving contact 8, two stationary contacts 9, and an electromagnetic mechanism. The ceramic cover is sealed and fixed to the magnetic plate 6, and the two stationary contacts 9 are brazed and fixed to the top of the ceramic cover. The upper armature 1, lower armature 2, armature support, push rod assembly 7, and moving contact 8 are all housed in the sealed space enclosed by the ceramic cover and the magnetic plate 6. The armature bracket 3 is integrally stamped with four support legs 301, all of which extend vertically, and the lower ends of the four support legs 301 are bent to form mounting feet, which are all fixedly riveted to the magnetic plate 6.

[0039] Furthermore, the lower armature 2 is U-shaped, and the movable contact piece 8 passes through the lower armature 2. At the same time, both the movable contact piece 8 and the lower armature 2 are mounted on the push rod assembly 7. The four support legs 301 of the armature bracket 3 are symmetrically distributed in pairs on the front and rear sides of the push rod assembly 7, while the upper armature 1 is located directly above the lower armature 2.

[0040] When the electromagnetic mechanism is energized, it drives the push rod assembly 7 to move upward through the moving iron core. The push rod assembly 7 then causes the moving contact piece 8 to abut against the two stationary contacts 9 (e.g., Figure 4 As shown, when current flows through the moving contact 8, a spiral magnetic field is generated. Under the action of this magnetic field, the upper armature 1 and the lower armature 2 can be magnetized and attract each other. The attraction force of the upper armature 1 on the lower armature 2 can be directly applied to the moving contact 8, which has an upward compensating force on the moving contact 8, providing additional contact pressure for the DC relay and improving its short-circuit resistance.

[0041] Therefore, the high and low voltage isolation and short-circuit protection structure of the DC relay of this utility model, by setting up an armature support composed of an armature bracket 3 and an insulating plastic part 4, with the insulating plastic part 4 covering the fixing plate 302 and the wall of the clearance hole of the armature bracket 3, and the upper armature 1 riveted to the insulating plastic part 4 and completely isolated from the armature bracket 3, achieves reliable electrical isolation between the upper armature 1 and the armature bracket 3, effectively avoiding the risk of breakdown between high and low voltage and improving the withstand voltage performance of the DC relay. On the other hand, the upper armature 1 and the lower armature 2 can attract each other under the action of the magnetic field formed by the contact current, providing additional pressure to the contacts and significantly enhancing the short-circuit protection capability of the relay. At the same time, compared with the complex process of brazing Kovar columns on the ceramic cover in the prior art, this structure achieves fixation through riveting and injection molding, which is simpler, reduces the risk of air leakage and the number of parts, and reduces production costs.

[0042] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-low voltage isolation and short-circuit protection structure for a DC relay, comprising an upper armature (1), a lower armature (2), and an armature support member, wherein the upper armature (1) and the lower armature (2) are magnetized and attracted to each other by the magnetic field generated when current flows through the contacts of the DC relay, thereby providing additional contact pressure for the DC relay; characterized in that, The armature support includes an armature bracket (3) and an insulating plastic part (4). The armature bracket (3) is provided with multiple support legs (301) and a fixed horizontal plate (302) fixedly connected to the upper end of the multiple support legs (301). The fixed horizontal plate (302) is provided with a clearance hole. The insulating plastic part (4) covers the fixed horizontal plate (302) and the hole wall of the clearance hole. At the same time, the insulating plastic part (4) is provided with a riveting hole (401) corresponding to the clearance hole. The upper armature (1) is riveted and fixed to the insulating plastic part (4), and the upper armature (1) is completely isolated from the armature bracket (3) through the insulating plastic part (4).

2. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The insulating plastic part (4) extends downward near both ends to form an isolation platform (402). The isolation platform (402) is located between the upper armature (1) and the support leg (301), and the width of the isolation platform (402) is not less than the width of the upper armature (1).

3. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The portion of the insulating plastic part (4) covering the armature bracket (3) does not include the plurality of the support legs (301).

4. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The insulating plastic part (4) and the armature bracket (3) are integrally formed by insert injection molding.

5. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The armature bracket (3) is integrally stamped from a metal sheet with a thickness of 0.5~1.2mm.

6. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 5, characterized in that, When the insulating plastic part (4) covers the fixed horizontal plate (302), the covering thickness on one side of the fixed horizontal plate (302) is 0.5~1mm.

7. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The upper armature (1) is composed of several armature pieces stacked together, and each armature piece has a through hole opposite to the riveting hole (401). Rivets (5) are inserted into the riveting hole (401) and the through hole to rivet and fix the several armature pieces to the insulating plastic part (4).

8. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 7, characterized in that, There are two or more riveting holes (401), and the number of through holes opened on each armature piece is the same as the number of riveting holes (401) and they correspond one-to-one.

9. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 1, characterized in that, The DC contactor includes a magnetic plate (6), and the lower ends of the plurality of support legs (301) are bent to form mounting feet, which are fixedly riveted to the magnetic plate (6).

10. The DC relay high and low voltage isolation and short-circuit protection structure according to claim 9, characterized in that, The DC contactor also includes a push rod assembly (7) and a moving contact piece (8). The lower armature (2) is U-shaped, and the moving contact piece (8) passes through the lower armature (2). At the same time, the moving contact piece (8) and the lower armature (2) are both mounted on the push rod assembly (7), and the upper armature (1) is located directly above the lower armature (2).

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