High-voltage direct-current relay

Abstract

The invention relates to the field of relays, and provides a high-voltage direct-current relay which comprises a shell which is internally sealed and filled with inert gas, a power connection contact part arranged at the top in the shell and a magnetic attraction action part arranged at the bottom in the shell, and the magnetic attraction action part is used for driving the power connection contact part to be communicated for power connection after power connection; the magnetic attraction action part comprises a magnet yoke unit and an iron core unit arranged in the magnet yoke unit, and the magnet yoke unit comprises a U-shaped magnet yoke and a fixed magnet yoke covering an opening of the U-shaped magnet yoke; the side edge of the bending part of the U-shaped magnet yoke is provided with a bending gap, and the bottom plate part of the U-shaped magnet yoke is of a polygonal structure. The U-shaped magnet yoke adopts two structural designs, namely, the bottom plate is of a polygonal structure design, so that the U-shaped magnet yoke can be conveniently bent and produced, and the production difficulty is reduced. And the two side plates of the U-shaped magnet yoke are designed to be folded, so that the space between the two side plates is similar to a circle, more coil turns can be accommodated, the electromagnetic performance of the magnet yoke is enhanced, and the overall working efficiency of the relay is improved.

Description

Technical Field

[0001] The invention relates to the field of relays, and in particular to a high-voltage direct current relay. Background Art

[0002] Relay, also known as relay, is an electronic control device, which has a control system (also known as input circuit) and a controlled system (also known as output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] However, existing relays have problems in design, such as large wiring torque, which can easily lead to separation of the welding or bonding of the contact terminals, destroying the sealing and leaking the built-in inert gas, resulting in reduced safety of the relay or even burning. Or, the reliability of the contact connection between the contacts is insufficient, and the single-point connection is prone to poor contact after a period of use. Or, in the structural design of the yoke, in order to ensure a simple production process, the electromagnetic performance of the iron core is reduced; or in order to ensure the electromagnetic performance of the iron core, the production process is complicated, increasing the production cost, etc. In order to solve the above problems, the present invention proposes a high-voltage DC relay with an optimized structure to improve the deficiencies of existing high-voltage DC relays. Summary of the invention

[0004] The object of the present invention is to provide a high voltage DC relay, aiming to improve the problem of insufficient structural stability or poor switching performance of the existing high voltage DC relay in use.

[0005] To achieve the above object, the present invention adopts the following technical solution: a high-voltage DC relay, comprising a housing sealed inside and filled with an inert gas, a power contact part arranged at the top of the housing, and a magnetic attraction action part arranged at the bottom of the housing, wherein the magnetic attraction action part is used to drive the power contact part to connect and connect after power is connected;

[0006] The magnetic attraction action part includes a yoke unit and an iron core unit arranged in the yoke unit, and the yoke unit includes a U-shaped yoke and a fixed yoke covering the opening of the U-shaped yoke;

[0007] A bending notch is arranged on the side of the bending part of the U-shaped magnetic yoke, and the bottom plate part of the U-shaped magnetic yoke is a polygonal structure.

[0008] Preferably, the bottom part of the U-shaped yoke is square, and the side of the U-shaped yoke aligned with the bent notch is provided with a bent structure bent inward; a limiting groove for engaging the fixed yoke is provided on the top surface of the side of the U-shaped yoke.

[0009] Preferably, the iron core unit includes an iron core, a bobbin sleeved outside the iron core, and a coil wound around the bobbin. A circuit board electrically connected to the coil is provided on the housing, and the power connection contact head is electrically connected to the circuit board.

[0010] Preferably, the power connection contact head includes a main circuit moving contact, a contact spring disposed between the main circuit moving contact and the magnetic attraction acting part, and two contact terminal posts spaced from the main circuit moving contact on the housing. A first support member for placing the contact spring is provided at the top of the iron core unit.

[0011] Preferably, at least two protruding structures for electrically connecting with the contact terminal posts are provided at one end of the top surface of the main circuit moving contact.

[0012] Preferably, the power connection contact head further includes an auxiliary moving contact, a protective member for installing the auxiliary moving contact, and a second support member connecting the protective member and the first support member. Two auxiliary static contacts spaced from the auxiliary moving contact are provided on the housing.

[0013] Preferably, a bifurcated structure for abutting and electrically connecting with the auxiliary static contact is provided at one end of the top surface of the auxiliary moving contact.

[0014] Preferably, a power connection cavity is provided on one end surface of the contact terminal post, and an anti-torsion shaft section for preventing the adhesive from separating when the contact terminal post twists itself is provided in the middle of the contact terminal post.

[0015] Preferably, the anti-torsion shaft section is a polygonal groove structure, a protruding structure or a planar structure.

[0016] Preferably, a permanent magnet is provided on the side wall of the housing at the power connection contact head, and a plurality of ribs are provided on the inner side surface of the housing at the power connection contact head.

[0017] After adopting the above technical solution, compared with the background technology, the present invention has the following advantages:

[0018] 1. After the magnetic attraction acting part is energized in the present invention, the magnetic attraction acting part can respond quickly. Through the action of magnetic attraction, the power connection contact head is driven to move, realizing the abutting contact of the contact structure of the high-voltage DC relay, so as to achieve the power connection effect, thereby realizing the rapid switching of high-voltage direct current.

[0019] 2. The U-shaped yoke of the present invention adopts two structural designs. That is, the bottom plate is designed with a polygonal structure to facilitate the bending production of the U-shaped yoke and reduce the production difficulty. The two side plates of the U-shaped yoke are designed with flanging, so that the space between the two side plates forms a quasi-circular shape to accommodate more coil turns, enhance the electromagnetic performance of the yoke, and improve the overall working efficiency of the relay. In this way, it can BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the high-voltage DC relay described in the present invention;

[0021] Figure 2 is a cross-sectional view of the high-voltage DC relay described in the present invention;

[0022] Figure 3 is a schematic structural diagram of the power connection contact part of the high-voltage DC relay described in the present invention;

[0023] Figure 4 is a partial view of the high-voltage DC relay described in the present invention;

[0024] Figure 5 is a partial exploded view of the high-voltage DC relay described in the present invention;

[0025] Figure 6 is a partial view of the magnetic attraction action part of the high-voltage DC relay described in the present invention;

[0026] Figure 7 is a schematic structural diagram of the contact terminal of the high-voltage DC relay described in the present invention.

[0027] DESCRIPTION OF THE REFERENCE NUMERALS:

[0028] 10. Housing; 11. Circuit board; 12. Permanent magnet; 13. Rib;

[0029] 20. Power connection contact part; 21. Main circuit moving contact; 22. Contact spring; 23. Contact terminal; 24. Auxiliary moving contact; 25. Protective part; 26. Second support part; 27. Auxiliary static contact;

[0030] 211. Protrusion structure;

[0031] 231. Power connection cavity; 232. Anti-torsion shaft section;

[0032] 241. Forked structure;

[0033] 30. Magnetic attraction action part; 31. Yoke unit; 32. Iron core unit;

[0034] 311. U-shaped yoke; 312. Fixed yoke;

[0035] 3111, Bent notch; 3112, Polygonal structure; 3113, Limiting groove; 3114, Bending structure; 321, Iron core; 322, Coil holder; 323, Coil; 324, First support member. Detailed implementation mode

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In addition, it should be noted that: the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, so it cannot be understood as a limitation of the present invention.

[0038] When an element is referred to as "fixed to" or "arranged on" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] Unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown in, this embodiment provides a high-voltage DC relay, including a housing 10 that is internally sealed and filled with inert gas, a power connection contact head 20 provided at the top inside the housing 10, and a magnetic attraction action part 30 provided at the bottom inside the housing 10. The magnetic attraction action part 30 is used to drive the power connection contact head 20 to connect the power after being powered on; the magnetic attraction action part 30 includes a magnetic yoke unit 31 and an iron core unit 32 provided inside the magnetic yoke unit 31. The magnetic yoke unit 31 includes a U-shaped magnetic yoke 311 and a fixed magnetic yoke 312 covering the opening of the U-shaped magnetic yoke 311; a bent notch 3111 is provided on the side of the bent part of the U-shaped magnetic yoke 311, and the bottom plate part of the U-shaped magnetic yoke 311 is a polygonal structure 3112.

[0041] For a high-voltage DC relay, it is a device used to effectively control high-voltage DC in a power system. Its structural design not only ensures the stability of electrical performance but also improves the response speed and reliability of the device. Specifically, after the magnetic attraction acting part 30 is energized, the magnetic attraction acting part 30 can quickly respond. Through the action of magnetic attraction force, it drives the power connection contact part 20 to act, realizes the top contact of the contact structure of the high-voltage DC relay, achieves the power connection effect, and thus realizes the rapid switching of high-voltage DC electricity.

[0042] Moreover, the sealed design inside the housing 10 can keep the inert gas filled in the housing 10 stable without leakage, which helps to improve the breakdown resistance and arc extinguishing performance of the high-voltage DC relay and ensures the safety of working in a high-voltage environment.

[0043] Furthermore, due to the magnetic attraction force of the iron core unit 32 acting on the magnetic attraction acting part 30, the opening and closing of the power connection contact part 20 can be accurately controlled, mechanical wear can be reduced, and the service life can be prolonged. At the same time, the design of the magnetic yoke unit 31 can effectively concentrate the magnetic force, that is, restrain the magnetic force lines generated by the induction coil 323 from spreading outwards, make the magnetic force line bundle concentrate around the induction coil 323, thereby improving the magnetic attraction efficiency and ensuring the stable operation of the relay in a high-voltage DC environment. In addition, the polygonal bottom plate design enhances the structural rigidity, and the structure is simple, and the processing technology is simple, which can reduce the production cost. At the same time, on the basis of the polygonal magnetic yoke, through the design of the "enveloping" structure on both sides (that is, the side plates on both sides of the U-shaped magnetic yoke 311), and through the design of the bending notch 3111 for bending the side plates on both sides, sufficient space for wiring is provided for the coil 323 of the iron core unit 32, forming a compact and orderly layout of the coil 323. Subsequently, a limiting groove 3113 is designed at the top of the U-shaped magnetic yoke 311 for installing and fixing the magnetic yoke 312 (the fixed magnetic yoke 312 is in a sheet or plate structure), so as to form a firm fixation of the iron core unit 32.

[0044] While ensuring the magnetic induction intensity and the mating flatness, the processing technology is greatly simplified, the processing difficulty is reduced, the characteristics of high space utilization rate of the circular magnetic yoke (that is, the side plates on both sides of the U-shaped magnetic yoke 311 form a space similar to a circle) are taken into account, and the convenience of manufacturing the square magnetic yoke (that is, the bottom plate of the U-shaped magnetic yoke 311 is polygonal, such as a square structure) is also taken into account.

[0045] Furthermore, as Figure 5 and Figure 6As shown in the figure, in this embodiment, the bottom plate portion of the U-shaped yoke 311 is square, and the bent structure 3114 is arranged with the side of the U-shaped yoke 311 aligned with the bent notch 3111 bent inward; a limiting groove 3113 for clamping and fixing the yoke 312 is arranged on the top surface of the side of the U-shaped yoke 311. The bent structure 3114 arranged with the side of the U-shaped yoke 311 bent inward makes the space enclosed between the two magnetic plates form a quasi-circular shape, which not only meets the requirement of magnetic induction intensity, but also improves the space utilization rate and ensures the efficient operation of the relay in a high-voltage environment. The square bottom plate design facilitates the production of the U-shaped yoke 311, reduces the production difficulty, and improves the production efficiency.

[0046] As Figure 2 shown in the figure, in this embodiment, the iron core unit 32 includes an iron core 321, a bobbin 322 sleeved outside the iron core 321, and a coil 323 wound around the bobbin 322. A circuit board 11 electrically connected to the coil 323 is arranged on the housing 10, and the power connection contact head 20 is electrically connected to the circuit board 11. A power connection terminal can be designed on the circuit board 11 to form a connector, such as a socket with a bent pin base structure, which can be plugged into an external power connection wire for power supply.

[0047] Specifically, the magnetic force of the coil 323 drives the iron core 321 to move, and then drives the opening and closing of the power connection contact head 20, realizing the design of power connection conduction of the high-voltage DC relay. After power-off, the iron core 321 loses the magnetic force, and the power connection contact head 20 quickly separates, ensuring the reliability of the power-off state. In addition, through the design of the circuit board 11, it is convenient to supply power to the high-voltage DC relay, while optimizing the circuit layout, reducing electromagnetic interference, and improving the response speed and stability of the relay.

[0048] Furthermore, the iron core 321 can be designed with a hollow structure. A push rod and a spring are arranged in the hollow interior. The push rod is linked with the power connection contact head 20. When power is off, the spring can provide a reset elastic force to ensure that the power connection contact quickly disconnects, enhancing the reliability of the power-off state. The design of the hollow iron core 321 also reduces the overall weight, improves the dynamic response performance of the relay, and extends the service life.

[0049] As Figure 3 and Figure 4 shown in the figure, in this embodiment, the power connection contact head 20 includes a main circuit moving contact 21, a contact spring 22 arranged between the main circuit moving contact 21 and the magnetic attraction action part 30, and two contact terminal posts 23 arranged on the housing 10 at intervals with the main circuit moving contact 21. A first support 324 for placing the contact spring 22 is arranged at the top of the iron core unit 32.

[0050] Specifically, the moving contact 21 of the main circuit abuts against and conducts with the contact terminal 23, and the contact spring 22 provides a stable contact pressure to ensure the reliability of current transmission. Under the action of the magnetic attraction action part 30, the moving contact responds quickly and moves towards the contact terminal 23 to achieve rapid conduction. When the power is off, the contact spring 22 rebounds quickly, and the moving contact 21 of the main circuit separates from the contact terminal 23 to ensure a rapid switch to the power-off state. The arc generated during on-off can be quickly extinguished by the inert gas in the housing 10, avoiding damage to the contacts and further improving the safety and service life of the relay. At the same time, the housing 10 is made of a high-strength material (such as ceramic material), enhancing the voltage resistance performance of the relay and ensuring its stable operation in a high-voltage environment.

[0051] In this embodiment, the first support member 324 is used to fixedly install the contact spring 22 to achieve the purpose of synchronously moving with the iron core unit 32, ensuring the stable movement of the contact spring 22 during the magnetic attraction action process, so as to install the power connection contact head 20 and improve the structural stability.

[0052] Furthermore, in this embodiment, at least two protruding structures 211 for electrically connecting with the contact terminal 23 are provided on one end of the top surface of the moving contact 21 of the main circuit. In this way, one end of the moving contact 21 of the main circuit is designed and installed to align with one contact terminal 23. The contact spring 22 can be designed in the middle of the moving contact 21 of the main circuit to balance the pressure distribution on both sides and ensure uniform contact. Moreover, the design of multiple protruding structures 211 can form multiple-point contact with the contact terminal 23, increasing the contact points and improving the stability of power connection. At the same time, the protruding structures 211 can also effectively disperse the current density, reduce local overheating phenomena, and extend the service life of the contacts.

[0053] Furthermore, the protruding structures 211 can be arranged in a vertical and horizontal pattern, or a fork-shaped structure, or a convex point structure, etc., to form different structures of multiple-point contact to ensure the stability of power connection.

[0054] As Figure 3 and Figure 4 shown, in this embodiment, the power connection contact head 20 further includes an auxiliary moving contact 24, a protective member 25 for installing the auxiliary moving contact 24, and a second support member 26 connecting the protective member 25 and the first support member 324. Two auxiliary static contacts 27 spaced from the auxiliary moving contact 24 are provided on the housing 10.

[0055] Specifically, through the synergistic effect of the protective part 25 and the second support part 26, the auxiliary moving contact 24 is installed on the first support part 324, so that it can be driven synchronously by the magnetic attraction action part 30, achieving the synchronous action of the auxiliary moving contact 24 and the main circuit moving contact 21 for power connection, thereby ensuring the coordination and consistency of the overall contact system, and improving the response speed and stability of the relay.

[0056] As Figure 4 shown, in this embodiment, a bifurcated structure 241 for abutting and electrically connecting with the auxiliary static contact 27 is provided at one end of the top surface of the auxiliary moving contact 24. The design of the bifurcated structure 241 can form multiple contact points, such as two bifurcations, three bifurcations or four bifurcations, etc., to ensure the stability of power connection, effectively disperse the current density, reduce the phenomenon of local overheating, and extend the service life of the contact.

[0057] As Figure 3 and Figure 7 shown, in this embodiment, a power connection cavity 231 is provided on one end surface of the contact terminal 23, and an anti-torsion shaft section 232 for preventing the adhesive from separating when the contact terminal 23 twists itself is provided in the middle of the contact terminal 23. The anti-torsion shaft section 232 is a polygonal groove structure, a convex structure 211 or a planar structure, etc., which can effectively prevent the adhesive from falling off during the twisting process of the terminal, and ensure the reliability of the connection of the contact terminal 23.

[0058] Specifically, when the anti-torsion shaft section 232 is designed as a polygon, its corners can effectively embed into the adhesive. Thus, when bonding with the through hole on the housing 10, a firm mechanical bond is formed to prevent loosening caused by torsion. At the same time, the polygonal structure 3112 can also disperse stress, avoid stress concentration points, and further improve the overall stability of the contact terminal 23.

[0059] In addition, the through hole on the housing 10 is also designed as a polygonal structure 3112, so that it can be precisely matched with the anti-torsion shaft section 232, enhancing the tightness of the connection and ensuring the anti-torsion performance. The polygonal design of the anti-torsion shaft section 232 not only improves the mechanical strength, but also optimizes the distribution of the adhesive, ensuring that it does not fall off during long-term use. In addition, the polygonal structure 3112 of the through hole on the housing 10 fits precisely with the anti-torsion shaft section 232, further enhancing the stability of the connection, effectively preventing the loosening phenomenon caused by torsion, and thus ensuring the reliability and safety of the entire contact system.

[0060] Furthermore, the contour shapes of the anti-torsion shaft section 232 and the through hole on the housing 10 that cooperates with it can be non-circular, such as a gear-like structure, a polygonal structure 3112, a groove structure, a single-plane structure or a double-plane structure, etc., to ensure that after filling with adhesive for bonding, it is not easy to loosen or separate due to torsion, and improve the stability of the structural assembly.

[0061] As Figure 2 shown, in this embodiment, a permanent magnet 12 is provided on the side wall of the power connection contact head 20 of the housing 10, and a plurality of ribs 13 are provided on the inner side surface of the housing 10 at the power connection contact head 20. The design of the permanent magnet 12 can attract the power connection contact head 20 to attract the generated electric arc when opening and closing, thereby effectively reducing the erosion of the contact by the electric arc; at the same time, the design of the ribs 13 can increase the creepage distance of the electric arc attracted to this position, achieving an efficient arc extinguishing effect, further extending the service life of the contact, and improving the overall performance of the relay. In addition, the synergistic effect of the permanent magnet 12 and the ribs 13 optimizes the arc control and ensures the stable operation of the relay in a high-voltage environment. The cooperation of the permanent magnet 12 and the ribs 13 cleverly utilizes the interaction between the magnetic force and the electric arc, realizes the precise control of the electric arc, and ensures the reliability and safety of the relay in a high-voltage environment.

[0062] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A high voltage DC relay, characterized in that: It comprises a shell which is sealed inside and filled with inert gas, a power contact part arranged at the top of the shell, and a magnetic attraction action part arranged at the bottom of the shell, wherein the magnetic attraction action part is used to drive the power contact part to connect and connect electricity after power is connected; The magnetic attraction action part includes a yoke unit and an iron core unit arranged in the yoke unit, and the yoke unit includes a U-shaped yoke and a fixed yoke covering the opening of the U-shaped yoke; A bending notch is arranged on the side of the bending part of the U-shaped magnetic yoke, and the bottom plate part of the U-shaped magnetic yoke is a polygonal structure.

2. The high voltage DC relay according to claim 1, characterized in that: The bottom plate of the U-shaped magnetic yoke is square, and the side of the U-shaped magnetic yoke is aligned with the bending notch and is bent inwardly to form a bending structure; The top surface of the side edge of the U-shaped magnetic yoke is provided with a limiting groove for engaging the fixed magnetic yoke.

3. The high voltage DC relay according to claim 1 or 2, characterized in that: The core unit comprises an iron core, a coil frame sleeved outside the iron core and a coil wound on the coil frame. A circuit board electrically connected to the coil is arranged on the shell, and the electrical contact part is electrically connected to the circuit board.

4. The high voltage DC relay according to claim 1, characterized in that: The power contact part includes a main circuit moving contact, a contact spring arranged between the main circuit moving contact and the magnetic attraction action part, and two contact terminals arranged on the shell at intervals from the main circuit moving contact. A first support member for placing the contact spring is arranged on the top of the core unit.

5. The high voltage DC relay according to claim 4, characterized in that: At least two protrusion structures for electrically connecting to the contact terminals are arranged on one end of the top surface of the main circuit moving contact.

6. The high voltage DC relay according to claim 4, characterized in that: The power contact part also includes an auxiliary moving contact, a protective member for mounting the auxiliary moving contact, and a second support member connecting the protective member and the first support member. Two auxiliary static contacts spaced apart from the auxiliary moving contact are arranged on the housing.

7. The high voltage DC relay according to claim 6, characterized in that: A forked structure for electrically connecting with the auxiliary static contact is arranged on one end of the top surface of the auxiliary moving contact.

8. The high voltage DC relay according to claim 4, characterized in that: An electric connection cavity is arranged on one end surface of the contact terminal, and an anti-torsion shaft section for preventing the adhesive from being separated when the contact terminal is twisted is arranged in the middle part.

9. The high voltage DC relay according to claim 8, characterized in that: The anti-torsion shaft section is a polygonal groove structure, a convex structure or a plane structure.

10. The high voltage DC relay according to claim 1, characterized in that: The shell is provided with a permanent magnet on the side wall of the electrical contact part, and the shell is provided with a plurality of convex ribs on the inner side surface of the electrical contact part.

Images