A snap-action electromagnetic relay

Abstract

The application discloses a clapper type electromagnetic relay, which comprises a clapper type working armature, a moving spring part connected with the armature and a static spring part corresponding to the moving spring part; the static spring part comprises a first static spring sheet and a second static spring sheet for realizing current inflow and outflow; the moving spring part comprises a plurality of flexible spring sheets capable of respectively elastically swinging and matched with the first static spring sheet and the second static spring sheet; the flexible spring sheets are elastically swung, so that the pressure of multiple groups of contacts can be balanced, and mutual interference between the multiple swinging spring sheets during action can be avoided.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to a snap-action electromagnetic relay. Background Technology

[0002] An electromagnetic relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. Essentially, it is an "automatic switch" that uses a smaller current and lower voltage to control a larger current and higher voltage. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] CN216597435U discloses a relay contact structure and an electromagnetic relay, including an electromagnetic component, an armature cooperating with the electromagnetic component, a movable contact piece fixedly connected to the armature via an insulating mounting base, and a stationary contact base disposed opposite to the movable contact piece; the number of stationary contact bases is two, and each stationary contact base is provided with an equal number of stationary contacts; the movable contact piece is provided with a movable contact platform with an equal number of stationary contacts; two movable contacts are provided on the movable contact platform, and the two movable contacts are respectively disposed corresponding to any one of the two stationary contacts on the two stationary contact bases. This structure fixes both movable contact platforms to the driveable contact piece, resulting in poor freedom of movement and a lack of flexibility between them. When one movable contact platform gets stuck and cannot move towards the stationary contact seat, the other movable contact platform also stops. This can lead to only one movable contact platform connecting to the circuit, or neither movable contact platform being able to contact the stationary contact, resulting in poor relay reliability. Furthermore, when the movable contacts make contact with the stationary contacts and close, the contact pressure is uneven due to the high rigidity of the connecting springs. Therefore, how to make the movement of the two movable contact bridges relatively free and independent, without interference, and how to balance the contact pressure have become urgent problems that need to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a snap-action electromagnetic relay that achieves balanced contact pressure through the elastic swing of a flexible spring and avoids mutual interference between multiple swinging springs.

[0005] The technical solution adopted by this invention to solve its technical problem is: a snap-action electromagnetic relay, comprising a snap-action armature, a moving spring portion connected to the armature, and a stationary spring portion corresponding to and matched with the moving spring portion; the stationary spring portion includes a first stationary spring plate and a second stationary spring plate for realizing the inflow and outflow of current; characterized in that: the moving spring portion includes a plurality of flexible spring plates that can each elastically swing and respectively cooperate with the first stationary spring plate and the second stationary spring plate, thereby balancing the pressure of multiple sets of contacts through the elastic swing of the flexible spring plates.

[0006] Furthermore, the plurality of flexible springs are a first swinging spring and a second swinging spring capable of elastically swinging independently. The first swinging spring and the second swinging spring are respectively provided with two moving contact portions connected in a bridge manner, and the first stationary spring and the second stationary spring are respectively provided with two stationary contact portions. The two moving contact portions of the first swinging spring are respectively provided at positions corresponding to and cooperating with one stationary contact portion of the first stationary spring and one stationary contact portion of the second stationary spring, and the two moving contact portions of the second swinging spring are respectively provided at positions corresponding to and cooperating with the other stationary contact portion of the first stationary spring and the other stationary contact portion of the second stationary spring. This allows the inflowing and outflowing currents to form two parallel paths at the contact portions while also preventing mutual interference between the two sets of moving contact portions during operation.

[0007] Furthermore, the roots of the first and second oscillating springs are respectively riveted and fixed to the armature; the roots of the first and second oscillating springs are connected as one unit, so that the first and second oscillating springs are formed by cutting strips from the same spring; or the first and second oscillating springs are not connected to each other.

[0008] Furthermore, the first oscillating spring is composed of one spring; the second oscillating spring is composed of two springs; one spring of the first oscillating spring is located in the middle, and the two springs of the second oscillating spring are located on both sides.

[0009] Furthermore, the end of the first oscillating spring is provided with a widened portion extending to both sides, and the two moving contact portions of the first oscillating spring are respectively located in the widened portion of the first oscillating spring.

[0010] Furthermore, the material of the movable spring part is stainless steel; the two movable contact parts of the first oscillating spring are movable contacts, and a movable contact bridge or a flexible wire is connected between the two widened parts of the first oscillating spring. The two movable contacts of the first oscillating spring are respectively connected to the two ends of the movable contact bridge or the flexible wire of the first oscillating spring.

[0011] Furthermore, a moving contact bridge or a flexible wire is connected between the ends of the two springs of the second oscillating spring. The two moving contact parts of the second oscillating spring are moving contacts, and the two moving contacts of the second oscillating spring are respectively connected to the two ends of the moving contact bridge or the flexible wire of the second oscillating spring.

[0012] Furthermore, the ends of the two springs of the second oscillating spring are respectively provided with a widened portion extending inward to one side, and the two ends of the moving contact bridge or the flexible wire of the second oscillating spring are respectively connected to the widened portions of the two springs of the second oscillating spring.

[0013] Furthermore, the roots of the first and second oscillating springs are arranged upwards and fixed to the armature respectively; the length of the downward protruding end of the first oscillating spring is greater than the length of the second oscillating spring, so that the moving contact portion of the first oscillating spring is below the moving contact portion of the second oscillating spring.

[0014] Furthermore, the distance between the two moving contact portions of the second oscillating spring is greater than the distance between the moving contact portions of the two first oscillating springs; and / or, two flexible wires are cross-connected between the two moving contact portions of the first oscillating spring and the two moving contact portions of the second oscillating spring, and the two flexible wires are connected at the middle position; and / or, the first oscillating spring and the second oscillating spring are integrally connected to the return spring from the root upwards, and the other end of the return spring is riveted and fixed to the yoke; thereby making the upper part of the armature fit at the knife edge of the yoke.

[0015] Furthermore, the distance from the position where the first oscillating spring is fixed to the armature to the armature rotation line is greater than the distance from the position where the second oscillating spring is fixed to the armature to the armature rotation line.

[0016] Furthermore, the stationary contact portion of the first stationary spring and the stationary contact portion of the second stationary spring are respectively stationary contacts; the two stationary contacts of the first and second stationary springs are respectively connected above and below the corresponding positions of the first and second stationary springs; when the armature moves, the lower moving contact portion of the moving spring portion contacts the lower stationary contact portion of the two stationary springs first, relative to the upper moving contact portion of the moving spring portion contacts the upper stationary contact portion of the two stationary springs; when the armature resets, the upper moving contact portion of the moving spring portion separates from the upper stationary contact portion of the two stationary springs first.

[0017] Furthermore, the stationary contacts below the first and second stationary springs and the corresponding moving contacts of the first and second oscillating springs are made of ablation-resistant materials; the stationary contacts above the first and second stationary springs and the corresponding moving contacts of the first and second oscillating springs are made of materials with relatively low resistance.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention employs an armature that operates by snapping together, a moving spring connected to the armature, and a corresponding stationary spring. The stationary spring includes a first and a second stationary spring plate for facilitating current inflow and outflow. The moving spring includes multiple flexible spring plates capable of elastically oscillating and cooperating with the first and second stationary spring plates respectively. Through the elastic oscillation of the flexible spring plates, the pressure of multiple sets of contacts can be balanced. This structure of the invention can balance the pressure of multiple sets of contacts and avoid mutual interference between the multiple oscillating spring plates during operation.

[0020] 2. Because the moving spring section includes a first and a second oscillating spring that can oscillate elastically, and each of the first and second oscillating springs has two moving contact portions connected in a bridge manner, and the first and second stationary springs each have two stationary contact portions; the two moving contact portions of the first oscillating spring are respectively located at positions corresponding to one stationary contact portion of the first and second stationary springs, and the two moving contact portions of the second oscillating spring are respectively located at positions corresponding to the other stationary contact portions of the first and second stationary springs, thereby achieving a two-way parallel connection of the inflowing and outflowing currents at the contact portions while avoiding mutual interference between the two sets of moving contact portions during operation. This structure of the present invention can achieve a two-way parallel connection of the inflowing and outflowing currents at the contact portions while avoiding mutual interference between the two sets of moving contact portions during operation, thereby preventing the other from stopping when one of the moving contact portions of the first and second oscillating springs gets stuck and cannot continue moving towards the stationary contact portion, thus enhancing the reliability of the relay.

[0021] 3. Because the two stationary contacts of the first and second stationary springs are respectively connected above and below corresponding positions of the first and second stationary springs, when the armature is activated, the lower moving contact of the moving spring portion contacts the lower stationary contact of the two stationary springs before the upper moving contact of the moving spring portion contacts the upper stationary contact of the two stationary springs. When the armature is reset, the upper moving contact of the moving spring portion separates from the upper stationary contact of the two stationary springs first. As the armature continues to rotate, the lower stationary contact of the two stationary springs breaks off from the corresponding moving contact, arcing and disconnecting the load. This structure of the present invention ensures that when the moving and stationary contacts are in contact, the lower moving and stationary contacts contact before the upper moving and stationary contacts, preventing arcing when the upper moving and stationary contacts contact. Furthermore, when the moving and stationary contacts separate, the upper moving and stationary contacts disconnect first, without arcing, thereby enhancing the service life of the relay.

[0022] 4. This invention employs a structure where the stationary contacts below the first and second stationary springs, and the corresponding moving contacts of the first oscillating spring, are made of materials that facilitate breaking and are resistant to ablation. Simultaneously, the stationary contacts above the first and second stationary springs, and the corresponding moving contacts of the second oscillating spring, are made of materials with relatively low resistance. In this structure, the upper moving and stationary contacts only carry current and are made of contact materials that facilitate contact resistance; while the lower moving and stationary contacts for connecting and disconnecting the load are made of materials that facilitate breaking and are resistant to ablation. Therefore, the relay as a whole achieves both low contact resistance and good load switching performance. The ablation-resistant material used for breaking increases the relay's electrical life. Thus, the contact material for load switching is selected to facilitate electrical life, while the contact material for current-carrying loads is selected to have low contact resistance. With these two sets of contacts in place, the relay satisfies both the requirements for low contact resistance and high electrical life.

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the snap-action electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention;

[0025] Figure 2 This is a front view of Embodiment 1 of the present invention;

[0026] Figure 3 This is a side view of Embodiment 1 of the present invention;

[0027] Figure 4 This is a three-dimensional structural diagram of Embodiment 1 of the present invention with the armature and moving spring removed;

[0028] Figure 5 This is a three-dimensional structural schematic diagram (back side) of the movable spring portion according to Embodiment 1 of the present invention;

[0029] Figure 6 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention;

[0030] Figure 7 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention (flipped at one angle);

[0031] Figure 8 This is a three-dimensional structural schematic diagram (front view) of the movable spring portion in Embodiment 2 of the present invention;

[0032] Figure 9 This is a three-dimensional structural schematic diagram (back side) of the movable spring portion according to Embodiment 2 of the present invention;

[0033] Figure 10 This is a three-dimensional structural schematic diagram of Embodiment 3 of the present invention;

[0034] Figure 11 This is a three-dimensional structural schematic diagram of Embodiment 4 of the present invention;

[0035] Figure 12 This is a three-dimensional structural schematic diagram of Embodiment 5 of the present invention;

[0036] Figure 13 This is a three-dimensional structural schematic diagram of Embodiment Six of the present invention;

[0037] Figure 14 This is a three-dimensional structural schematic diagram of Embodiment Seven of the present invention. Detailed Implementation

[0038] Example 1

[0039] See Figures 1 to 5 As shown, a snap-action electromagnetic relay includes a snap-action armature 1, a moving spring portion 2 connected to the armature 1, and a stationary spring portion 3 corresponding to and matched with the moving spring portion 2; the stationary spring portion 3 includes a first stationary spring plate 31 and a second stationary spring plate 32 for realizing the inflow and outflow of current; the moving spring portion 2 includes a plurality of flexible spring plates that can each elastically swing and respectively cooperate with the first stationary spring plate 31 and the second stationary spring plate 32, thereby balancing the pressure of multiple sets of contacts through the elastic swing of the flexible spring plates.

[0040] In this embodiment, the material of the moving spring part 2 is stainless steel, and it is only responsible for reaction force and not for current carrying; the multiple flexible springs are a first swinging spring 21 and a second swinging spring 22 that can swing elastically. The first swinging spring 21 has two moving contact parts 211 and 212 connected in a bridge manner, and the second swinging spring 22 has two moving contact parts 221 and 222 connected in a bridge manner. The first stationary spring 31 has two stationary contact parts 311 and 312, and similarly, the second stationary spring 32 also has two stationary contact parts 321 and 322. The two moving contact portions 211 and 212 of the first swing spring 21 are respectively provided at positions corresponding to and cooperating with the stationary contact portion 311 of the first stationary spring 31 and the stationary contact portion 321 of the second stationary spring 32. The two moving contact portions 221 and 222 of the second swing spring 22 are respectively provided at positions corresponding to and cooperating with the stationary contact portion 312 of the first stationary spring 31 and the stationary contact portion 322 of the second stationary spring 32. This allows the inflow and outflow currents to form two parallel paths at the contact portions while also preventing the two moving springs from interfering with each other during operation.

[0041] In this embodiment, the roots of the first oscillating spring 21 and the second oscillating spring 22 are respectively riveted and fixed to the armature 1; the root of the first oscillating spring 21 and the root of the second oscillating spring 22 are connected as one unit, so that the first oscillating spring 21 and the second oscillating spring 22 are formed by cutting strips from the same spring. In other embodiments, the first oscillating spring 21 and the second oscillating spring 22 are not connected to each other.

[0042] In this embodiment, the first swing spring 21 is composed of one spring; the second swing spring 22 is composed of two springs; one spring of the first swing spring 21 is located in the middle, and the two springs of the second swing spring 22 are located on both sides.

[0043] In this embodiment, the end of the first swing spring 21 is provided with a widened portion extending to both sides, and the two moving contact portions 211 and 212 of the first swing spring 21 are respectively provided in the widened portion of the first swing spring 21.

[0044] In this embodiment, the two moving contact portions 211 and 212 of the first swing spring 21 are moving contacts, and a moving contact bridge 213 is connected between the two widened portions of the first swing spring 21. The two moving contacts 211 and 212 of the first swing spring 21 are respectively connected to the two ends of the moving contact bridge 213 of the first swing spring 21.

[0045] In this embodiment, a moving contact bridge 223 is also connected between the ends of the two springs of the second swing spring 22. The two moving contact portions 221 and 222 of the second swing spring 22 are moving contacts, and the two moving contacts 221 and 222 of the second swing spring 22 are respectively connected to the two ends of the moving contact bridge 223 of the second swing spring 22.

[0046] In this embodiment, the ends of the two springs of the second swing spring 22 are respectively provided with a widened portion extending inward to one side, and the two ends of the moving contact bridge 223 of the second swing spring 22 are respectively connected to the widened portions of the two springs of the second swing spring 22.

[0047] In this embodiment, the roots of the first swing spring 21 and the second swing spring 22 are fixed to the armature 1 respectively with their roots facing upward; the length of the downward protruding end of the first swing spring 21 is greater than the length of the second swing spring 22, so that the moving contact portions 211 and 212 of the first swing spring 21 are below the moving contact portions 221 and 222 of the second swing spring 22.

[0048] In this embodiment, the distance between the two moving contact portions 221, 222 of the second swing spring 22 is greater than the distance between the two moving contact portions 211, 212 of the first swing spring 21.

[0049] In this embodiment, the distance from the position where the first swing spring 21 is fixed to the armature 1 to the rotation line of the armature 1 is greater than the distance from the position where the second swing spring 22 is fixed to the armature 1 to the rotation line of the armature 1.

[0050] In this embodiment, the static contact portions 311 and 312 of the first static spring 31 and the static contact portions 321 and 322 of the second static spring 32 are static contacts. The two stationary contacts of the first stationary spring 31 and the second stationary spring 32 are respectively connected above and below the corresponding positions of the first stationary spring 31 and the second stationary spring 32. When the armature 2 moves, the lower moving contact parts 211 and 212 of the moving spring part 2 and the lower stationary contact parts 311 and 321 of the two stationary springs 31 and 32 first contact each other with the upper moving contact parts 221 and 222 of the moving spring part 2 and the upper stationary contact parts 312 and 322 of the two stationary springs 31 and 32. When the armature 2 is reset, the upper moving contact parts 221 and 222 of the moving spring part 2 and the upper stationary contact parts 312 and 322 of the two stationary springs 31 and 32 first separate. As the armature 2 continues to rotate, the lower stationary contact parts 311 and 321 of the two stationary springs 31 and 32 break away from the corresponding moving contact parts 211 and 212, arcing and disconnecting the load. Specifically, the thickness of the lower stationary contact of the first stationary spring 31 and the second stationary spring 32 is greater than the thickness of the upper stationary contact of the first stationary spring 31 and the second stationary spring 32. Taking the first stationary spring 31 as an example, the stationary contact portions 311 and 312 of the first stationary spring 31 are stationary contacts, and the thickness of the lower stationary contact 311 of the first stationary spring 31 is greater than the thickness of the upper stationary contact 312 of the first stationary spring 31.

[0051] In this embodiment, the stationary contacts above the first stationary spring 31 and the second stationary spring 32, and the corresponding moving contacts of the second oscillating spring 22, only carry current and are made of contact materials that are conducive to contact resistance, such as AgCuO. Meanwhile, the stationary contacts below the first stationary spring 31 and the second stationary spring 32, and the corresponding moving contacts of the first oscillating spring 21, which connect and disconnect the load, are made of materials that are conducive to breaking and resistant to ablation, such as AgCuO. Therefore, the relay as a whole can achieve both low contact resistance and good load switching performance, and the use of ablation-resistant materials for breaking helps ensure the relay's electrical life.

[0052] In this embodiment, the first swing spring 21 and the second swing spring 22 are integrally connected to the return spring 23 from the root upwards; the other end of the return spring 23 is riveted and fixed to the yoke 4; thus, the upper part of the armature 1 is fitted at the blade edge of the yoke 4. The yoke 4 is L-shaped, the coil frame 5 is horizontally arranged, the rear end of the coil frame 5 is fixed to one side of the L-shape of the yoke 4, and the other end of the L-shape of the yoke 4 is provided with a blade edge, so that the armature 1 is set at the front end of the coil frame 5 and fits at the blade edge of the yoke 4. The armature 1 rotates around the blade edge of the yoke 5 under the action of the return spring 23.

[0053] Example 2

[0054] See Figure 6-9As shown, the snap-fit ​​electromagnetic relay of the present invention differs from that of Embodiment 1 in that the tail end of the second moving spring is bent toward the stationary spring to form a bent portion 224, so as to protect the contacts and ensure that the surface of the current-carrying contact group is clean.

[0055] Example 3

[0056] See Figure 10 As shown, the snap-action electromagnetic relay of the present invention differs from Embodiment 1 in that two flexible wires 213 and 223 are cross-connected between the two moving contact portions 211 and 212 of the first oscillating spring 21 and the two moving contact portions 221 and 222 of the second oscillating spring 22, and the two flexible wires 213 and 223 are connected at the middle position. More specifically, the two flexible wires 21 and 223 are fixed and connected at the middle position by welding.

[0057] Example 4

[0058] See Figure 11 As shown, the snap-action electromagnetic relay of the present invention differs from that of Embodiment 1 in that a flexible wire 213 is connected between the two widened portions of the first oscillating spring 21, and the two moving contacts 211 and 212 of the first oscillating spring 21 are respectively connected to the two ends of the flexible wire 213 of the first oscillating spring 21.

[0059] Example 5

[0060] See Figure 12 As shown, the snap-action electromagnetic relay of the present invention differs from Embodiment 1 in that a flexible wire 213 is further connected between the two widened portions of the first oscillating spring 21, and the two moving contacts 211 and 212 of the first oscillating spring 21 are respectively connected to the two ends of the flexible wire 213 of the first oscillating spring 21. A flexible wire 223 is further connected between the ends of the two springs of the second oscillating spring 22, and the two moving contacts 221 and 222 of the second oscillating spring 22 are moving contacts, respectively connected to the two ends of the flexible wire 223 of the second oscillating spring 22. The ends of the two springs of the second oscillating spring 22 are respectively provided with widened portions extending inward, and the two ends of the flexible wire 223 of the second oscillating spring 22 are respectively connected to the widened portions of the two springs of the second oscillating spring 22.

[0061] Example 6

[0062] See Figure 13As shown, the snap-action electromagnetic relay of the present invention differs from that of Embodiment 1 in that the roots of the two springs of the first swing spring 21 and the second swing spring 22 are connected together with the connection point facing upwards and fixed to the armature 1; the second swing spring 22 is M-shaped.

[0063] Example 7

[0064] See Figure 14 As shown, the snap-action electromagnetic relay of the present invention differs from that of Embodiment 1 in that the roots of the two springs of the second swing spring 22 are connected together with the roots facing upwards, and the connection point is fixed to the armature 1; the roots of the first swing spring 21 are fixed to the armature 1 with the roots facing upwards, and extend upwards to connect with the connection point of the two springs of the second swing spring 22.

[0065] This invention discloses a snap-action electromagnetic relay comprising a snap-action armature, a moving spring portion connected to the armature, and a corresponding stationary spring portion. The stationary spring portion includes a first stationary spring plate and a second stationary spring plate for realizing current inflow and outflow. The moving spring portion includes multiple flexible spring plates capable of elastically oscillating and respectively cooperating with the first and second stationary spring plates. Through the elastic oscillation of the flexible spring plates, the pressure of multiple sets of contacts can be balanced. This structure of the present invention can balance the pressure of multiple sets of contacts and avoid mutual interference between multiple oscillating spring plates during operation.

[0066] The present invention discloses a snap-action electromagnetic relay, wherein the moving spring portion 2 includes a first swinging spring 21 and a second swinging spring 22, each capable of elastically swinging. The first swinging spring 21 and the second swinging spring 22 are respectively provided with two moving contact portions connected in a bridge manner, and the first stationary spring 31 and the second stationary spring 32 are respectively provided with two stationary contact portions. The two moving contact portions of the first swinging spring 21 are respectively provided at positions corresponding to and cooperating with one stationary contact portion of the first stationary spring 31 and one stationary contact portion of the second stationary spring 32, and the two moving contact portions of the second swinging spring 22 are respectively provided at positions corresponding to and cooperating with the other stationary contact portion of the first stationary spring 31 and the other stationary contact portion of the second stationary spring 32. This achieves the formation of two parallel currents at the contact portions while avoiding mutual interference between the two sets of moving contact portions during operation. This structure of the present invention can achieve two parallel connections of inflow and outflow currents at the contact portion, while also avoiding mutual interference between the two sets of moving contacts during operation. This prevents the other from stopping when one of the moving contacts of the first swing spring and the second swing spring gets stuck and cannot continue to move towards the stationary contact portion, thus enhancing the reliability of the relay.

[0067] This invention discloses a snap-action electromagnetic relay, in which two stationary contacts of a first stationary spring 31 and a second stationary spring 32 are respectively connected above and below corresponding positions of the first and second stationary springs. When the armature actuates, the lower moving contact of the moving spring portion contacts the lower stationary contact of the two stationary springs before the upper moving contact of the moving spring portion contacts the upper stationary contact of the two stationary springs. When the armature resets, the upper moving contact of the moving spring portion separates from the upper stationary contact of the two stationary springs. As the armature continues to rotate, the lower stationary contact of the two stationary springs breaks off from the corresponding moving contact, arcing and disconnecting the load. This structure ensures that when the moving and stationary contacts contact each other, the lower moving and stationary contacts contact before the upper moving and stationary contacts, preventing arcing when the upper moving and stationary contacts contact. Furthermore, when the moving and stationary contacts separate, the upper moving and stationary contacts disconnect first, without arcing, thereby enhancing the relay's service life.

[0068] This invention discloses a snap-action electromagnetic relay. The stationary contacts below the first stationary spring 31 and the second stationary spring 32, and the corresponding moving contacts of the first oscillating spring 21, are made of ablation-resistant materials. Simultaneously, the stationary contacts above the first stationary spring 31 and the second stationary spring 32, and the corresponding moving contacts of the second oscillating spring 22, are made of materials with relatively low resistance. In this structure, the upper moving and stationary contacts only carry current and are made of contact materials that promote contact resistance; while the lower moving and stationary contacts for connecting and disconnecting the load are made of materials that promote breaking and are ablation-resistant. Therefore, the relay as a whole achieves both low contact resistance and good load switching performance. The ablation-resistant material used for breaking increases the relay's electrical life. Thus, the contact material for load switching is selected to promote electrical life, while the contact material for current carrying is selected to have low ground contact resistance. With the two sets of contacts in operation, the relay satisfies both ground contact resistance and electrical life requirements.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A snap-action electromagnetic relay, comprising a snap-action armature, a moving spring portion connected to the armature, and a stationary spring portion corresponding to and matched with the moving spring portion; the stationary spring portion includes a first stationary spring plate and a second stationary spring plate for realizing current inflow and outflow; characterized in that: The moving spring section includes multiple flexible springs, each capable of elastically oscillating. These flexible springs are first and second oscillating springs, each capable of elastically oscillating. The first oscillating spring has two bridge-connected moving contact portions that respectively cooperate with the first and second stationary springs. The second oscillating spring also has two bridge-connected moving contact portions that respectively cooperate with the first and second stationary springs. Through the elastic oscillation of the flexible springs, the pressure of multiple sets of contact points can be balanced. The roots of the first and second oscillating springs are positioned upwards and fixed to the armature. The downward protruding length of the tail end of the first oscillating spring is greater than the length of the second oscillating spring, thus placing the moving contact portion of the first oscillating spring below the moving contact portion of the second oscillating spring.

2. The snap-action electromagnetic relay according to claim 1, characterized in that: The first and second stationary springs are each provided with two stationary contact portions; the two moving contact portions of the first oscillating spring are respectively provided at positions corresponding to and cooperating with one stationary contact portion of the first and second stationary springs, and the two moving contact portions of the second oscillating spring are respectively provided at positions corresponding to and cooperating with the other stationary contact portion of the first and second stationary springs, so that while realizing the formation of two parallel currents between the moving and stationary contact portions, the mutual interference of the two sets of moving contact portions can also be avoided during operation.

3. The snap-action electromagnetic relay according to claim 2, characterized in that: The root of the first oscillating spring and the root of the second oscillating spring are respectively riveted and fixed to the armature. The root of the first oscillating spring and the root of the second oscillating spring are connected as one unit, so that the first oscillating spring and the second oscillating spring are formed by cutting strips from the same spring. Alternatively, the root of the first oscillating spring and the root of the second oscillating spring are respectively riveted and fixed to the armature, and the first oscillating spring and the second oscillating spring are not connected to each other.

4. The snap-action electromagnetic relay according to claim 3, characterized in that: The first oscillating spring consists of one spring; the second oscillating spring consists of two springs; one spring of the first oscillating spring is located in the middle, and the two springs of the second oscillating spring are located on both sides.

5. The snap-action electromagnetic relay according to claim 4, characterized in that: The end of the first oscillating spring is provided with a widened portion extending to both sides, and the two moving contact portions of the first oscillating spring are respectively located in the widened portion of the first oscillating spring.

6. The snap-action electromagnetic relay according to claim 5, characterized in that: The material of the moving spring part is stainless steel; the two moving contact parts of the first swing spring are moving contacts, and a moving contact bridge or a flexible wire is connected between the two widened parts of the first swing spring. The two moving contacts of the first swing spring are respectively connected to the two ends of the moving contact bridge or the flexible wire of the first swing spring.

7. The snap-action electromagnetic relay according to claim 5 or 6, characterized in that: The two ends of the second swing spring are connected by a moving contact bridge or a flexible wire. The two moving contact parts of the second swing spring are moving contacts, and the two moving contacts of the second swing spring are respectively connected to the two ends of the moving contact bridge or the flexible wire of the second swing spring.

8. The snap-action electromagnetic relay according to claim 7, characterized in that: The ends of the two springs of the second swing spring are respectively provided with a widened portion extending inward to one side, and the two ends of the moving contact bridge or the flexible wire of the second swing spring are respectively connected to the widened portion of the two springs of the second swing spring.

9. The snap-action electromagnetic relay according to claim 1, characterized in that: The distance between the two moving contact parts of the second swing spring is greater than the distance between the two moving contact parts of the first swing spring; and / or, two flexible wires are cross-connected between the two moving contact parts of the first swing spring and the two moving contact parts of the second swing spring, and the two flexible wires are connected at the middle position; and / or, the first swing spring and the second swing spring are integrally connected from the root upward to one end of the reset spring, and the other end of the reset spring is riveted to the yoke and fixed, so that the upper part of the armature is fitted at the knife edge of the yoke.

10. The snap-action electromagnetic relay according to claim 9, characterized in that: The distance from the position where the first swing spring is fixed to the armature to the armature rotation line is greater than the distance from the position where the second swing spring is fixed to the armature to the armature rotation line.

11. The snap-action electromagnetic relay according to claim 2, characterized in that: The stationary contact portion of the first stationary spring and the stationary contact portion of the second stationary spring are respectively stationary contacts; the two stationary contacts of the first stationary spring and the second stationary spring are respectively connected above and below the corresponding positions of the first stationary spring and the second stationary spring; when the armature moves, the moving contact portion of the first swing spring contacts the stationary contact below the first stationary spring and the second stationary spring first, relative to the moving contact portion of the second swing spring contacting the stationary contact above the first stationary spring and the second stationary spring; when the armature resets, the moving contact portion of the second swing spring separates from the stationary contact above the first stationary spring and the second stationary spring first.

12. The snap-action electromagnetic relay according to claim 11, characterized in that: The stationary contacts below the first and second stationary springs and the corresponding moving contacts of the first oscillating spring are made of ablation-resistant materials; the stationary contacts above the first and second stationary springs and the corresponding moving contacts of the second oscillating spring are made of materials with relatively low resistance.

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