An electromagnetic relay contact spring device having a plurality of conversion contact groups

Abstract

An electromagnetic relay contact spring device with multiple conversion contact groups relates to a contact spring device. Multiple lead-out rods are arranged in an array and are arranged through a base plate, at least four conversion contact groups are installed, a static closing static spring piece body is an n-shaped bent plate, a welding protrusion one is arranged on one side vertical support arm, a static closing impact package is arranged in the middle of the other side vertical support arm, a dynamic closing static spring piece body is a z-shaped bent plate, and a fixed end is arranged along a vertical direction to set a fixed plate, the fixed plate is arranged with a welding protrusion two, a dynamic closing impact package is arranged in the middle of a free end, a dynamic spring piece body is a long strip plate and a fixed position is formed by twice right angle bending of a connection end, the fixed position is arranged with a welding protrusion three, two of the conversion contact groups are arranged in a center symmetry mode and are installed on the lead-out rods of a first row, and the other two conversion contact groups are installed on the lead-out rods of a second row in the same arrangement mode. The static closing impact package and the dynamic closing impact package are arranged as a cantilever structure, so that the contact is flexible when the contact is closed, the static closing overtravel and the dynamic closing overtravel are greatly increased, and the electrical life is improved.

Description

Technical Field

[0001] This invention relates to a contact spring device, and more particularly to an electromagnetic relay contact spring device with multiple changeover contact groups, belonging to the field of relay research and development technology. Background Technology

[0002] Electromagnetic relays possess unique electrical and physical characteristics in control circuits. They are control switching elements with features such as small size, simple structure, high sensitivity, strong load capacity, large input-output control ratio, low heat generation, strong anti-interference ability, low power consumption, fast action speed, high switching depth, and multi-channel synchronous switching capability. They are widely used in fields such as smart grids, new energy vehicles, and intelligent robots. However, with increasingly stringent usage conditions, the requirements for relay performance indicators are also becoming higher and higher.

[0003] The contact spring system is a crucial component ensuring the reliability of electromagnetic relay contacts. It primarily provides the necessary contact pressure and overtravel required for the relay's lifespan. The proper coordination between the reaction force characteristics generated by the contact spring system and the attraction characteristics generated by the electromagnetic system ensures that the relay's operation and release processes meet the requirements of the contact breaking process. Slow contact breaking speed and long arc burning time exacerbate contact erosion, causing material buildup in the contact gap and ultimately leading to bridging failure, thus reducing the relay's electrical life. Currently used electromagnetic relays with multiple changeover contact groups have both the statically closed and normally open contacts directly welded to the lead-out rod. When the contacts are closed, they approximate a rigid contact, resulting in a small contact overtravel, long arc burning time, and severe contact erosion, leading to a low electrical life for the electromagnetic relay. The inventor's earlier Chinese invention patent application, published on May 4, 2016 (publication number CN104241032B), entitled "A Relay Contact Spring Device," involves extending the normally open and stationary contacts from within, thus improving their breaking speed. However, the stationary contacts are still directly welded to the lead-out rod, failing to solve the problem of rigid contact during closure. Furthermore, current magnetic latching relays with four sets of changeover contacts suffer from bending and deformation of the moving springs, resulting in a small gap between the two sets of moving springs, poor insulation withstand voltage between them, and even short-circuit faults caused by overlapping of the two sets of moving springs. Summary of the Invention

[0004] To address the shortcomings of the prior art, this invention provides an electromagnetic relay contact spring device with multiple changeover contact groups. It sets the static closing spring and the dynamic closing spring as a cantilever structure, so that the contacts are in flexible contact when closed, which greatly increases the static closing overtravel and dynamic closing overtravel, thereby improving the electrical life.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an electromagnetic relay contact spring device with multiple changeover contact groups, comprising a base plate and multiple lead-out rods. The multiple lead-out rods are arranged in at least a two-row, six-column array on the base plate. At least four changeover contact groups are installed on the multiple lead-out rods. Each changeover contact group includes a stationary contact spring, a moving contact spring, and a moving spring. The main body of the stationary contact spring is an n-shaped bent plate, which is integrally formed by a horizontal connecting part and vertical support arms on both sides. One vertical support arm is provided with a welded protrusion one, and the other vertical support arm is provided with a stationary contact punch in the middle. The main body of the moving contact spring is a z-shaped bent plate, which is integrally formed by a free-end straight support arm, an oblique connecting part, and a fixed-end straight support arm. The fixed-end straight support arm is integrally provided with a fixed plate along the vertical direction at its end, and the fixed plate is provided with a welded protrusion two. A dynamic engagement punch is provided in the middle of the free end straight support arm. The main body of the dynamic spring is a long strip plate, and its connecting end is bent at a second right angle to form a fixed position. The fixed position is provided with a welding protrusion three. The static engagement spring of the first changeover contact group is welded to the lead-out rod of one row and one column through the welding protrusion one. The dynamic engagement static spring is welded to the lead-out rod of one row and two columns through the welding protrusion two. The dynamic spring is welded to the lead-out rod of one row and four columns through the welding protrusion three. The other end of the dynamic spring is in contact with the static engagement punch in its natural state, and the other end of the dynamic spring is equipped with a pusher that can push the dynamic spring to contact the dynamic engagement punch. The second changeover contact group is symmetrically arranged with the first changeover contact group and installed on the lead-out rod of the remaining three columns of the row. The third and fourth changeover contact groups are arranged in the same way as the first and second changeover contact groups and installed on the lead-out rod of the second row.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: The static contact spring sheet of the present invention is bent twice into an n-shaped bending plate to guide the static contact punch from the lead-out rod; the dynamic contact spring sheet is bent three times into a z-shaped bending plate plus a fixing plate to guide the dynamic contact punch from the lead-out rod. Compared with the traditional method of directly welding to the lead-out rod for near-rigid contact, the vertical support arm of the static contact spring sheet with the static contact punch and the straight support arm of the dynamic contact spring sheet with the dynamic contact punch are both cantilever structures. When the contacts close, they are in flexible contact, greatly increasing the static and dynamic contact overtravel, effectively preventing contact bounce upon closure, and increasing the contact breaking speed. Furthermore, the static and dynamic contact punches are arc-shaped protrusions directly machined onto the static and dynamic contact spring sheets, respectively. When the moving reed contacts, it is a line contact, which greatly increases the contact area and reduces the contact resistance compared to traditional point contact, thus enhancing the surge resistance. In addition, an arc-starting angle is set. When the contact breaks, an electric arc is generated. The magnetic field generated by the current flowing through the stationary and moving reeds acts on the electric arc. Under the action of the Lorentz force, the electric arc moves towards the arc-starting angle, which lengthens the arc and accelerates its extinguishing. This helps to reduce contact erosion and improve the electrical life. Thus, the contact spring device of this invention has the advantages of strong surge resistance, fast arc extinguishing, and fast contact breaking speed. Moreover, the layout of the moving reeds is conducive to increasing the spacing, effectively maintaining the space utilization of the relay, reducing the risk of short-circuit faults, and enhancing the life and reliability of the relay. Attached Figure Description

[0007] Figure 1 This is an isometric view of the overall structure of the electromagnetic relay contact spring device of the present invention;

[0008] Figure 2 yes Figure 1 Top view;

[0009] Figure 3 This is an isometric view of the static spring sheet of the present invention;

[0010] Figure 4 This is an isometric view of the dynamic and static spring of the present invention;

[0011] Figure 5 This is an isometric view of the movable spring of the present invention;

[0012] Figure 6 This is a schematic diagram illustrating the function of the static spring in blowing an arc according to the present invention;

[0013] Figure 7 This is a schematic diagram illustrating the arc-blowing function of the dynamic and static springs of the present invention. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0015] like Figures 1-5 As shown, an electromagnetic relay contact spring device with multiple changeover contact groups includes a base plate 5 and multiple lead-out rods 6. The multiple lead-out rods 6 are arranged in an array of at least two rows and six columns on the base plate 5. At least four changeover contact groups are installed on the multiple lead-out rods 6. Each changeover contact group includes a stationary contact spring 1, a moving contact spring 3, and a moving contact spring 4. Considering the insulation distance, there is a gap between the stationary contact spring 1, the moving contact spring 3, and the moving contact spring 4 and the base plate 5.

[0016] Combination Figure 3 As shown, the main body of the static spring 1 is an n-shaped bent plate 1-1. The n-shaped bent plate 1-1 is integrally formed by a horizontal connecting part 1-1-1 and two vertical support arms 1-1-2 on both sides. One vertical support arm 1-1-2 is provided with a welding protrusion 1-2, and the other vertical support arm 1-1-2 is provided with a static punch 1-3 in the middle.

[0017] Combination Figure 4 As shown, the main body of the dynamic and static spring 3 is a Z-shaped bent plate 3-1. The Z-shaped bent plate 3-1 is integrally formed by a free end straight support arm 3-1-1, an oblique connecting part 3-1-2, and a fixed end straight support arm 3-1-3. A fixed plate 3-2 is integrally provided at the end of the fixed end straight support arm 3-1-3 along the vertical direction. The fixed plate 3-2 is provided with a welding protrusion 3-3. A dynamic punch 3-4 is provided in the middle of the free end straight support arm 3-1-1.

[0018] Combination Figure 5 As shown, the main body of the moving spring 4 is a long strip plate and its connecting end is bent at a second right angle to form a fixed position 4-1. The fixed position 4-1 is provided with a welding protrusion 4-2.

[0019] Combination Figures 1-2As shown, the stationary contact spring 1 of the first changeover contact group is welded to the lead-out rod 6 in one row and one column via the welding protrusion 1-2. The moving contact spring 3 is welded to the lead-out rod 6 in one row and two columns via the welding protrusion 3-3. The moving spring 4 is welded to the lead-out rod 6 in one row and four columns via the welding protrusion 4-2. The other end of the moving spring 4 is in contact with the stationary contact punch 1-3 in its natural state, and the other end of the moving spring 4 is equipped with a pusher 2 that can push the moving spring 4 to contact the moving contact punch 3-4. The second changeover contact group is arranged symmetrically with the first changeover contact group and installed on the lead-out rod 6 in the remaining three columns of one row. The third and fourth changeover contact groups are arranged in the same way as the first and second changeover contact groups and installed on the lead-out rod 6 in the second row.

[0020] Combination Figures 3-4 As shown, further, the static contact punch 1-3 is an arc-shaped protrusion structure integrally set at the middle position of the vertical support arm 1-1-2 on the corresponding side of the static contact spring 1, and the dynamic contact punch 3-4 is an arc-shaped protrusion structure integrally set at the middle position of the straight support arm 3-1-1 at the free end of the dynamic contact static spring 3. The line contact when contacting the dynamic spring is achieved by directly machining the arc-shaped protrusion structure, which greatly increases the contact area compared with the traditional point contact.

[0021] In addition, the stationary contact spring 1 is provided with an arc-inducing angle 1-4 at the outer end of the stationary contact punch 1-3, and the moving contact spring 3 is provided with an arc-inducing angle 3-5 at the outer end of the moving contact punch 3-4. Both the arc-inducing angle 1-4 and the arc-inducing angle 3-5 are arc-shaped structures that bend outwards, which lengthens the arc, accelerates the arc extinguishing, reduces contact erosion, and improves electrical life.

[0022] Combination Figure 6 As shown, the current I passing through the stationary contact spring 1 flows from the welding protrusion 1-2 through the stationary contact punch 1-3 to the moving contact spring 4. According to the right-hand screw rule, the current flowing from the welding protrusion 1-2 to the stationary contact punch 1-3 generates a magnetic field B pointing outward. When the contacts break, an electric arc will be generated between the stationary contact punch 1-3 and the moving contact spring 4. According to the left-hand rule, the electric arc is subjected to a downward Lorentz force F and moves at a certain speed V along the arc initiation angle 1-4 under the action of the Lorentz force F.

[0023] Combination Figure 7 As shown, the current I passing through the movable contact spring 3 flows from the welding protrusion 3-3 through the movable contact punch 3-4 to the movable contact spring 4. According to the right-hand screw rule, the current flowing from the welding protrusion 3-3 to the movable contact punch 3-4 generates a magnetic field B pointing inward. When the contacts break, an electric arc will be generated between the movable contact punch 3-4 and the movable contact spring 4. According to the left-hand rule, the electric arc is subjected to a Lorentz force F pointing to the left, and under the action of the Lorentz force F, it moves at a certain speed V along the arc initiation angle 3-5.

[0024] The method of using this invention is as follows:

[0025] 1. Spot weld the stationary contact spring 1, the moving contact spring 3, and the moving spring 4 to the corresponding lead-out rods 6 respectively. Each of the three types of springs is kept at a certain distance from the base plate 5, taking into account the insulation distance.

[0026] 2. Adjust the position of the moving spring 4 so that the initial static pressure reaches the design requirements, and then adjust the position of the moving and stationary spring 3 to meet the contact gap requirements;

[0027] 3. When the relay is in the energized state, after the pusher 2 has traveled a certain distance, it pushes the moving spring 4 to disengage from the stationary spring 1. The initial static pressure gradually decreases to 0. After the moving spring 4 passes through the contact gap, it contacts the moving spring 3, and the contact spring system enters the overtravel stage.

[0028] 4. When the relay is in the released state, the moving spring 4 separates from the normally open stationary spring 3. Since the normally open stationary spring 3 is led out from the inside, the distance between the welding point of the normally open punch 3-4 and the lead-out rod 6 increases, and the breaking speed is faster.

[0029] 5. Since the moving springs 4 are basically parallel, the gap between the moving springs 4 is relatively large when the relay is in the energized and de-energized state, which can effectively prevent the risk of short circuit due to contact.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electromagnetic relay spring device with multiple changeover contact groups, comprising a base plate (5) and multiple lead-out rods (6), wherein the multiple lead-out rods (6) are arranged in at least a two-row, six-column array on the base plate (5), and at least four changeover contact groups are mounted on the multiple lead-out rods (6), characterized in that: Each of the aforementioned switching contact groups includes a stationary contact spring (1), a moving contact spring (3), and a moving contact spring (4). The main body of the stationary contact spring (1) is an n-shaped bent plate (1-1). The n-shaped bent plate (1-1) is integrally formed by a horizontal connecting part (1-1-1) and vertical support arms (1-1-2) on both sides. One vertical support arm (1-1-2) is provided with a welding protrusion (1-2), and the other vertical support arm (1-1-2) is provided with a stationary contact punch (1-3) in the middle. The main body of the moving contact spring (3) is a z-shaped bent plate (3-1). The z-shaped bent plate (3-1) is composed of a free-end straight support arm (3-1-1) and an oblique connecting part (3-1-2). -2) and the fixed end linear support arm (3-1-3) are integrally made, and the fixed end linear support arm (3-1-3) is integrally provided with a fixed plate (3-2) in the vertical direction at the end of the fixed end linear support arm (3-1-3). The fixed plate (3-2) is provided with a second welding protrusion (3-3). The free end linear support arm (3-1-1) is provided with a dynamic engagement punch (3-4) in the middle. The main body of the dynamic spring (4) is a long strip plate and its connecting end is bent at a second right angle to form a fixed position (4-1). The fixed position (4-1) is provided with a third welding protrusion (4-2). The static engagement spring (1) of the first conversion contact group is welded to the lead-out rod (6) in a row and column through the first welding protrusion (1-2). The stationary spring (3) is welded to the lead-out rod (6) of a row of two columns via the second welding protrusion (3-3). The moving spring (4) is welded to the lead-out rod (6) of a row of four columns via the third welding protrusion (4-2). The other end of the moving spring (4) is in contact with the stationary closing punch (1-3) in its natural state. The other end of the moving spring (4) is equipped with a pusher (2) that can push the moving spring (4) to contact the moving closing punch (3-4). The second changeover contact group is symmetrically arranged with the first changeover contact group on the lead-out rod (6) of the remaining three columns of a row. The third changeover contact group and the fourth changeover contact group are connected with the first changeover contact group and the second changeover contact group. The same arrangement is installed on the lead-out rod (6) of the second row. The static spring (1) is located at the outer end of the static punch (1-3) and the arc-leading angle one (1-4) is set. The dynamic spring (3) is located at the outer end of the dynamic punch (3-4) and the arc-leading angle two (3-5) is set. The arc-leading angle one (1-4) and the arc-leading angle two (3-5) are both arc-shaped structures that bend outward. The static punch (1-3) is an arc-shaped protrusion structure integrally set at the middle position of the vertical support arm (1-1-2) on the corresponding side of the static spring (1). The dynamic punch (3-4) is an arc-shaped protrusion structure integrally set at the middle position of the straight support arm (3-1-1) at the free end of the dynamic spring (3).

2. The electromagnetic relay contact spring device with multiple changeover contact groups according to claim 1, characterized in that: There are gaps between the stationary contact spring (1), the moving contact spring (3) and the moving spring (4) and the base plate (5).

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