Contact piece structure and magnetic retention relay

Abstract

To provide an improved contact piece structure and a magnetic retention relay. [Solution] The contact piece structure includes two side-by-side movable contacts, each of which includes a contact piece portion, a movable contact, and a fixed contact, the contact piece portion includes a plurality of stacked contact pieces, with gaps between adjacent contact pieces, the movable contact and the fixed contact are provided at opposite ends of the contact piece portion, the movable contact and the fixed contact are provided at opposite ends of the contact piece portion such that when the movable contact and the fixed contact are closed, the two movable contacts form a parallel circuit structure, the movable contact and the fixed contact in one of the movable contacts correspond to the fixed contact and the movable contact in the other movable contact, and at least one of the movable contacts further includes a projection positioned in the gap and connected to at least one of the contact pieces

Description

Technical Field

[0001] The present disclosure relates to the field of relay technology, and particularly to a contact piece structure and a magnetic latching relay.

Background Art

[0002] A magnetic latching relay is an automatic switch for turning on / off a circuit. The magnetic latching relay includes a contact piece structure and a coil. The contact piece structure has at least two contact pieces. One of the contact pieces is provided with a movable contact, and the other contact piece is provided with a fixed contact. When a positive pulse voltage is applied to the coil, the movable contact and the fixed contact are brought into contact, and the circuit is turned on. When a reverse pulse voltage is applied to the coil, the movable contact and the fixed contact are disconnected, and the circuit is turned off.

[0003] In related technologies, since a short circuit is likely to occur in a circuit, when a short-circuit current passes through the movable contact and the fixed contact, it is necessary to improve the resistance of the magnetic latching relay to the short-circuit current so as to resist the repulsive force generated at that time and make it difficult for the two to be disconnected, that is, to increase the contact pressure between the movable contact and the fixed contact. However, in related technologies, the contact pressure between the movable contact and the fixed contact could not be effectively increased. The above information disclosed in the background art section is only for the purpose of facilitating the understanding of the context of the present disclosure, and thus may include information that does not constitute related technologies already known to those skilled in the art.

Summary of the Invention

[0004] Embodiments of the present disclosure provide a contact piece structure that can effectively increase the contact pressure between a movable contact and a fixed contact, thereby effectively resisting a short-circuit current. According to one aspect of the present disclosure, a contact piece structure including two juxtaposed movable contacts is provided, and each said movable contact includes a contact piece portion, a movable contact, and a fixed contact.

[0005] A movable contact and a fixed contact are provided at opposite ends of the contact piece, and when the movable contact and the fixed contact are closed, the two movable contacts form a parallel circuit structure, with the movable contact and the fixed contact of one movable contact corresponding to the fixed contact and the movable contact of the other movable contact. Each contact piece has at least one bend, and the bends of two contact pieces are arranged in a one-to-one correspondence to form a bend pair, in each bend pair the upper ends of the two bends are parallel and the two bends protrude in the same direction, and the first distance between the two bends is smaller than the second distance between the ends of the two contact pieces.

[0006] In some embodiments of the present disclosure, in the protruding direction, at least a portion of the first bend is housed within the space formed by the protruding portion of the second bend.

[0007] In some embodiments of the present disclosure, there are multiple pairs of bends, and a third gap is provided between two of the contact pieces located between adjacent pairs of bends, the third gap being larger than the first gap.

[0008] In some embodiments of the present disclosure, the protruding direction includes a first and a second opposing direction, wherein some of the multiple bending pairs protrude in the first direction and some of the other bending pairs protrude in the second direction.

[0009] In some embodiments of the present disclosure, in each of the bending pairs, the size of the opening of the second bending portion is larger than the size of the upper end of the first bending portion, such that the upper end of the first bending portion is accommodated in the opening of the second bending portion.

[0010] In some embodiments of the present disclosure, the shape of each of the bent portions is one of a trapezoid, rectangle, square, pentagon, hexagon, or octagon.

[0011] In some embodiments of the present disclosure, each of the contact pieces comprises a plurality of stacked contact pieces, with gaps between adjacent contact pieces.

[0012] In some embodiments of the present disclosure, the contact piece portion is provided with a plurality of gaps in the stacking direction of the contact piece, and the size of the plurality of gaps is different.

[0013] In some embodiments of the present disclosure, the contact piece structure further comprises a projection positioned within the gap and connected to at least one of the contact pieces.

[0014] In some embodiments of the present disclosure, the projection is provided in the gap between at least one of the contact pieces between adjacent bent pairs.

[0015] In some embodiments of the present disclosure, the projections are plurality, and the plurality of projections are provided in the gaps between the plurality of contact pieces in at least one contact piece portion, and in one contact piece portion, the projections are aligned in the projection direction, or the projections are offset in the projection direction, or a portion of the projections are aligned in the projection direction.

[0016] In some embodiments of the present disclosure, the projection is provided in the gap between the plurality of contact pieces in two of the contact piece portions.

[0017] In some embodiments of the present disclosure, the number of protrusions on the two contact pieces may be the same or different.

[0018] In some embodiments of the present disclosure, the projections provided on the two contact pieces are aligned or offset in the direction of projection.

[0019] In some embodiments of the present disclosure, the projection is provided only in the gap between the plurality of contact pieces in one of the contact piece portions.

[0020] In some embodiments of this disclosure, the size of the projection in the projection direction is less than or equal to the size of the gap.

[0021] One embodiment of the present disclosure also provides a magnetic latch relay including a contact piece structure described in any of the above embodiments.

[0022] As can be seen from the technical proposal described above, this disclosure has at least one of the following advantages and positive effects.

[0023] In the embodiments of this disclosure, a bent pair is provided on the contact piece, and the first distance between the two bent portions in each bent pair is smaller than the second distance between the ends of the two contact pieces. Therefore, the distance between the two contact pieces is reduced, and in a parallel circuit structure formed by two movable contacts, currents moving in the same direction attract each other, generating an electric force. Therefore, reducing the distance between the two contact pieces increases the electric force between the two contact pieces. At the same time, the upper ends of the bent portions are parallel in each bent pair, reducing the horizontal component of the electric force. In addition, the bent portions increase the effective length of the contact pieces, further increasing the electric force between the two contact pieces, thereby effectively increasing the contact pressure between the movable contact and the fixed contact, making them less likely to break and effectively resisting short-circuit currents. Furthermore, by arranging the bent pairs, the electric force received by the contact pieces can be flexibly adjusted according to the magnitude of the short-circuit current. [Brief explanation of the drawing]

[0024] The above and other features and advantages of this disclosure will become more apparent by describing in detail exemplary embodiments of this disclosure with reference to the accompanying drawings. [Figure 1] Figure 1 is a schematic front view of a contact piece structure as shown in some embodiments of the present disclosure. [Figure 2] Figure 2 is a schematic three-dimensional structural diagram of a contact piece structure as shown in some embodiments of the present disclosure. [Figure 3]Figure 3 is a schematic three-dimensional structure diagram of the contact piece structure from another perspective shown in some embodiments of the present disclosure. [Figure 4] Figure 4 is a schematic structure diagram of one movable contact in the contact piece structure shown in some embodiments of the present disclosure. [Figure 5] Figure 5 is an enlarged view of part A in Figure 4. [Figure 6] Figure 6 is a schematic structure diagram of another movable contact in the contact piece structure shown in some embodiments of the present disclosure. [Figure 7] Figure 7 is an enlarged view of part B in Figure 6. [Figure 8] Figure 8 is an exploded schematic diagram of the movable contact shown in some embodiments of the present disclosure. [Figure 9] Figure 9 is a schematic front view of the contact piece structure provided with protrusions in the embodiment of the present disclosure. [Figure 10] Figure 10 is an enlarged view of part C in Figure 9. [Figure 11] Figure 11 is a schematic front view of the contact piece structure shown in some embodiments of the present disclosure. [Figure 12] Figure 12 is an enlarged view of part D in Figure 11. [Figure 13] Figure 13 is a three-dimensional schematic diagram of the magnetic holding relay shown in some embodiments of the present disclosure. [Figure 14] Figure 14 is a schematic top view of the magnetic holding relay with the cover removed shown in some embodiments of the present disclosure. [Figure 15] [[ID=​​​​​​​​​​​Figure 19 is an exploded schematic view of a movable contact as shown in some embodiments of the present disclosure. [Figure 20] Figure 20 is a schematic front view of a contact piece structure shown in another embodiment of the present disclosure. [Figure 21] Figure 21 is an enlarged view of section F in Figure 20. [Figure 22] Figure 22 is a schematic front view of a contact piece structure according to another embodiment of the present disclosure. [Figure 23] Figure 23 is an enlarged view of section G in Figure 22. [Figure 24] Figure 24 is a schematic front view of a contact piece structure as shown in some embodiments of the present disclosure. [Figure 25] Figure 25 is an enlarged view of section H in Figure 24. [Figure 26] Figure 26 is a three-dimensional schematic diagram of a magnetic holding relay as shown in some embodiments of the present disclosure. [Figure 27] Figure 27 is a schematic top view of a magnetic holding relay with its cover removed, as shown in some embodiments of the present disclosure. [Figure 28] Figure 28 is a schematic three-dimensional diagram of a magnetic retaining relay with its cover and mounting bracket removed, as shown in some embodiments of this disclosure. [Explanation of symbols]

[0025] 100 Contact piece structure; 1, 1' Movable contact; 11, 11' Contact piece section; 111 First bend; 111' Second bend; 112, 112' Contact piece; 1121 Gap; 12, 12' Movable contact; 13, 13' Fixed contact; 14 Projection; 141 Central axis; 151 First movable contact lead piece; 152 Second movable contact lead piece; 16, 16' Pressure spring; 200 Housing; 21 Base; 22 Cover; 300 Magnetic circuit structure; 31 Coil assembly; 311 Coil frame; 312 Coil; 32 Yoke assembly; 321 First yoke; 322 Second yoke; 33 Permanent magnet; 331 Rotating shaft; 34 Armature; 400 Push card; 500 Fixed frame; X Horizontal direction; Y Projection direction; Y1 First direction; Y2 Second direction; d1 First spacing; d2 Second spacing; d3 Third spacing; h1 Size of projection; h2 Size of gap. [Modes for carrying out the invention]

[0026] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, exemplary embodiments can be carried out in various forms and should not be understood as being limited to the embodiments described herein. In contrast, these embodiments are provided to make this disclosure comprehensive and complete and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures indicate the same or similar components, and their detailed description is omitted.

[0027] Embodiments of the present disclosure provide a contact piece structure 100. As shown in Figure 1, the contact piece structure 100 includes two parallel movable contacts 1, 1'. The two movable contacts 1, 1' have the same structure. Each movable contact 1, 1' comprises a contact piece portion 11, 11', movable contacts 12, 12', and fixed contacts 13, 13', the movable contacts 12, 12' and fixed contacts 13, 13' being located at opposite ends of the contact piece portion 11, 11'. When the movable contacts 12, 12' and fixed contacts 13, 13 are closed, the two movable contacts 1, 1' form a parallel circuit structure, with the movable contact 12 and fixed contact 13 in one movable contact 1 corresponding to the fixed contact 13' and movable contact 12' in the other movable contact 1', respectively. Each contact piece 11, 11' has at least one bent portion, and the bent portions of two contact pieces 11, 11' are arranged in a one-to-one correspondence to form a bent pair. In each bent pair, the upper ends of the two bent portions are parallel, and the two bent portions protrude along the same protruding direction Y, and the first distance d1 between the two bent portions is smaller than the second distance d2 between the ends of the two contact pieces 11, 11'.

[0028] In the contact piece structure 100 of the embodiment of this disclosure, the contact pieces 11 and 11' are provided with bent pairs, and the first gap d1 between the two bent portions in each bent pair is smaller than the second gap d2 between the ends of the two contact pieces 11 and 11'. Therefore, the distance between the two contact pieces 11 and 11' is reduced. In a parallel circuit structure formed by two movable contacts 1 and 1', currents moving in the same direction attract each other, generating an electric force. Therefore, reducing the distance between the two contact pieces 11 and 11' increases the electric force between the two contact pieces 11 and 11'. The upper ends of the two bent portions in each bent pair are parallel, reducing the horizontal component of the electric force and further increasing the electric force between the two contact pieces 11 and 11'. This effectively increases the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13 and 31, making them less likely to disconnect and effectively resisting short-circuit currents.

[0029] The contact piece structure 100 according to the embodiments of this disclosure will be described in detail below.

[0030] In some embodiments, a movable contact 1 will be used as an example, as shown in Figures 1 to 4. The contact piece portion 11 of the movable contact 1 includes a plurality of stacked contact pieces 112, with gaps 1121 provided between adjacent contact pieces 112. The movable contact 12 and the fixed contact 13 can pass through both ends of the stacked plurality of contact pieces 112, respectively, so that the movable contacts 12, 12' and the fixed contacts 13', 13 in the two contact piece portions 11, 11' can contact each other.

[0031] In some embodiments, as shown in Figures 1 and 2, the first bend 111 is formed by bending the contact piece 11, and the first bend 111 can protrude along the protrusion direction Y. The protrusion direction Y can be understood as the direction perpendicular to the surface of the contact piece 11, and as shown in Figure 1, the protrusion direction Y includes two opposing directions: a first direction Y1 and a second direction Y2. If there is one bend pair, the bend pair may protrude in the first direction Y1 or in the second direction Y2. If there are multiple bend pairs, all of the multiple bend pairs may protrude in the first direction Y1, all of them may protrude in the second direction Y2, or some of the bend pairs may protrude in the first direction Y1 and other parts of the bend pairs may protrude in the second direction Y2, and are not particularly limited. When there are multiple bending pairs, the protrusion direction Y of the multiple bending pairs may not be the same. As shown in Figure 1, the protrusion direction Y of the bending pairs located on the left and right sides of Figure 1 are different. The protrusion direction Y of the bending pair located on the left is the first direction Y1, and the protrusion direction Y of the bending pair located on the right is the second direction Y2. Therefore, the protrusion direction Y of the bending pair described in the embodiments of this disclosure refers to the direction in which the bending pair protrudes. For example, the protrusion direction Y of the bending pair on the left is the first direction Y1, not the second direction Y2.

[0032] As shown in Figure 4, since the contact piece portion 11 includes a plurality of stacked contact pieces 112, the size of the opening in the bent portion of each contact piece 112 may be different. The size of the opening can be understood as the size of the opening in the bent portion in the horizontal direction X. The horizontal direction X is the direction in which the contact piece 112 extends and can be defined as the direction perpendicular to the protruding direction Y. In some embodiments, at least a portion of the first bent portion 111 is housed in a space (not shown) formed by the protruding portion of the second bent portion 111', such that in the protruding direction Y, the first gap d1 between the two bent portions in each bent pair is smaller than the second gap d2 between the ends of the two contact pieces.

[0033] In some embodiments, as shown in Figures 3 and 4, in the contact piece portion 11, each of the stacked contact pieces 112 has one sub-bend, and the size of the openings of the sub-bends along the protruding direction Y gradually increases. The sub-bends together form a bend in the contact piece portion 11.

[0034] In some embodiments, as shown in Figure 1, in each bending pair, the size of the opening of the second bending portion 111' is larger than the size of the upper end of the first bending portion 111, so that the upper end of the first bending portion 111 can be accommodated in the opening of the second bending portion 111'.

[0035] Specifically, the size of the opening of the bent portion refers to the size of the opening of the bent portion along the horizontal direction X, and the size of the upper end of the bent portion refers to the maximum size of the upper end of the bent portion in the horizontal direction X. This allows the tip of the first bent portion 111 to be housed within the opening of the second bent portion 111', and reduces the first gap d1 between the two bent portions in the bent pair. This first gap d1 can be understood as the distance between the upper end of the first bent portion 111 and the lower end of the second bent portion 111' in the bent pair. Here, the upper end of the first bent portion 111 refers to the upper end of the protruding portion, and the lower end of the second bent portion 111' refers to the position of the protruding portion closest to the first bent portion 111. Therefore, the first gap d1 is shorter than the second gap d2 between the ends of the two contact pieces 11 and 11'. Here, the second gap d2 between the ends of the two contact pieces 11, 11' can be understood as the distance between the ends of the contact pieces 11, 11' having the movable contacts 12, 12' and the fixed contacts 13, 13'.

[0036] When the two movable contacts 1 and 1' are energized, the movable contact 12 and the fixed contact 13' are attracted to each other, and the movable contact 12' and the fixed contact 13 are attracted to each other, so that the two movable contacts 1 and 1' form a parallel circuit, and the current flowing through the two contact pieces 11 and 11' is in the same direction. Due to the principle that currents in the same direction attract each other, the two contact pieces 11 and 11' will always attract each other. However, at the bend, the first distance d1 between the two contact pieces 11 and 11' becomes smaller, increasing the electrical force that attracts the two contact pieces 11 and 11' to each other. At the same time, the bend increases the effective length of the contact pieces 11 and 11', increasing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 13, preventing the movable contacts 12 and 12' and the fixed contacts 13' and 13 from separating due to the repulsive force caused by the short-circuit current, and ensuring the stability of the circuit operation by withstanding the short-circuit current.

[0037] In fact, the electric force is formed by the Ampere force (Lorentz force). The two movable contacts 1 and 1' can be considered as two parallel conductors, and when the movable contacts 1 and 1' are energized, the two contact pieces 11 and 11' generate a magnetic field around them, and due to the action of the current flow and the magnetic field, one contact piece 11 receives the Ampere force of the other contact piece 11', causing them to attract each other. This attraction increases the contact pressure between the movable contacts 12 and 12' at both ends and the electrostatic contacts 13' and 13, causing them to be attracted to each other more firmly.

[0038] However, in some embodiments, taking the movable contact 1 as an example, the contact piece 112 of the contact piece 11 has a certain degree of flexibility, that is, the contact piece 112 has low rigidity. This is because, when the contact piece 112 is pushed and the movable contact 12 and the fixed contact 13' of the other contact piece 11' are energized and closed, the contact piece 112 has a certain degree of elasticity that can cause overtravel, thereby making the contact between the movable contact 12 and the fixed contact 13' of the other contact piece 11' more stable and less prone to recoiling. However, precisely because the contact piece 112 has a certain degree of flexibility, when the contact piece 112 is subjected to an electric force, the contact piece 112 bends in a direction toward the other contact piece 112' with its middle portion as a fulcrum, and because the amount of deformation in this middle portion is large, the ends of the contact piece 112 lift up in opposite directions. As shown in Figures 11 and 14, the movable contacts 1, 1' of the contact piece structure 100 further include compression springs 16, 16', taking the movable contact 1 as an example, with one end of the compression spring 16 connected to the movable contact 12 and the other end connected to the push card 400 of the magnetic holding relay. If both ends of the contact piece 112 lift up, i.e., both ends of the movable contact 1 lift up, the compression spring 16 is driven to move, and the movement of the compression spring 16 drives the push card 400 to move, causing the entire magnetic holding relay to become unstable and potentially affecting the electrical performance of the magnetic holding relay. To avoid the above situation, in embodiments of the present disclosure, when the number of bent pairs is set to a multiple, two contact pieces 11, 11' located between adjacent bent pairs have a third spacing d3, the third spacing d3 being greater than the first spacing d1.

[0039] In other words, by making the distance between the straight sections located between two adjacent bent pairs in the two contact pieces 11 and 11' greater than the distance between the two bent sections in one bent pair, the electrical force acting on the straight sections is smaller than the electrical force acting on the bent sections, and greater than the electrical force acting on both ends of the contact pieces 11 and 11' where the movable contacts 12 and 12' and fixed contacts 13 and 13' are provided. This reduces the amount of deformation and prevents lifting of both ends of the contact pieces 11 and 11' due to excessive deformation. At the same time, because there are gaps 1121 between the multiple contact pieces 112 of the contact piece 11, the deformation of each contact piece 112 in the contact piece 11 does not affect each other, i.e., they do not overlap, further preventing the entire contact piece 11 from deforming excessively and affecting the contact pressure between the movable contact 12 and the fixed contact 13'. The contact piece 11' is the same as the contact piece 11, so its description is omitted.

[0040] In some embodiments, the third gap d3 between the straight sections located between two adjacent bent pairs in the two contact pieces 11, 11' may be less than or equal to the second gap d2 between the two ends of the two contact pieces 11, 11' (the ends where the movable contacts 12, 12' and fixed contacts 13, 13' are provided). This allows the electrical force acting on the straight sections to increase the contact pressure between them, in addition to the contact pressure between the movable contacts 12, 12 and the fixed contacts 13, 13'.

[0041] In some embodiments, when the flexibility of the contact pieces 112, 112' is relatively large, the third gap d3 between the straight portions located between two adjacent bent pairs in the two contact piece portions 11, 11' can be made larger than the second gap d2 between the ends of the two contact piece portions 11, 11' (the ends where the movable contacts 12, 12' and fixed contacts 13, 13' are provided), thereby further preventing the contact pieces 112, 112' from deforming excessively and causing both ends of the contact pieces 112, 112' to lift up when subjected to an electric force.

[0042] In some embodiments, the shape of the bend may be trapezoidal, rectangular, square, or other polygonal. As shown in Figure 1, in embodiments of the present disclosure, the bends of the contact pieces 11, 11' are trapezoidal, and the upper ends of the multiple bends extend along the horizontal direction X, i.e., the upper ends of the multiple bends are parallel, so that the electrical forces acting on two bends are perpendicular to themselves, and no diagonal electrical forces are generated. This reduces the component of the electrical force along the horizontal direction X, and increases the electrical force acting on each contact piece 11, 11'. Continuing to refer to Figure 1, the side walls of the multiple bends can also be parallel to each other, as a result maximizing the attractive force between the two contact pieces 11, 11' and further increasing the electrical force.

[0043] In some embodiments, the shape of the bends may be a rectangle, a square, or other polygon, and the polygon may be a pentagon, a hexagon, an octagon, etc., provided that the upper ends of the two bends in each pair of bends are parallel to each other.

[0044] In some embodiments, adjacent pairs of bends have different shapes. For example, the two bends in the first pair of bends are trapezoidal, the two bends in the adjacent second pair of bends are both square, the two bends in the adjacent third pair of bends are both rectangular, and the two bends in the adjacent fourth pair of bends are both polygonal.

[0045] In some embodiments, the shapes of the bends in each pair of bends may differ from one another. For example, in one pair of bends, the first bend 111 may be trapezoidal and the second bend 111' may be square, or in another pair of bends, the first bend 111 may be rectangular and the second bend 111' may be pentagonal. Whether the shapes of the bends in a pair of bends are the same or different, their upper ends are parallel to each other, and those skilled in the art can choose according to the actual situation, and are not particularly limited here.

[0046] In some embodiments, the upper end of the bend and the two side walls are curved to facilitate manufacturing and extend the service life of the contact pieces 112, 112'.

[0047] In some embodiments, as shown in Figure 1, the contact piece 11, for example, has multiple gaps 1121 in the stacking direction, and the sizes of the multiple gaps 1121 are different. That is, the sizes of the multiple gaps 1121 are different in the protruding direction Y.

[0048] Specifically, as shown in Figure 1, the contact piece portion 11 will be used as an example. The gap 1121 between the multiple contact pieces 112 of the contact piece portion 11 is located between the ends of the contact piece portion 11 where the movable contact 12 and the fixed contact 13 are provided. Since this gap 1121 is formed between adjacent sub-bent portions, the size of the gap 1121 can be determined according to the degree of bending of the sub-bent portion. Therefore, the contact piece structure 100 according to the embodiment of this disclosure allows for flexible adjustment of the size of the gap 1121 between each contact piece 112. The degree of bending can be determined as the dimension from the upper wall to the opening along the protruding direction Y of the sub-bent portion. By providing a gap 1121 between the multiple contact pieces 112, when each contact piece 112 is deformed by an electric force, the deformation of each contact piece 112 does not affect each other, and the stability of the electric force received is ensured. Furthermore, the magnitude of the electric force acting on the contact pieces 112 and 112' can be flexibly adjusted by changing the number of bending pairs, the degree of bending of the bending parts, or the first spacing d1 between the bending parts in each bending pair, depending on the magnitude of the short-circuit current.

[0049] In some embodiments, as shown in Figures 4-12, the contact piece structure 100 further includes a projection 14 positioned within the gap 1121 and connected to at least one contact piece 112, 112'. The projection 14 is provided in the gap 1121, and when the contact pieces 112, 112' deform due to an electrical force, the projection 14 can resist the deformation of the contact pieces 112, 112', that is, the projection 14 can reduce the amount of deformation of the contact pieces 112, 112'. If the contact pieces 112, 112' are flexible, the projection 14 prevents the contact pieces 112, 112' from deforming excessively and causing the ends of the contact pieces 112, 112' to lift, ensuring the stability of the contact pressure between the movable contacts 12, 12' and the fixed contacts 13', 13, and preventing the movable contacts 12, 12' and the fixed contacts 13', 13 from being separated by a repulsive force due to a short-circuit current.

[0050] Of these, the projection 14 can be connected to the contact piece 112 (taking the contact piece 112 as an example) by welding, screwing, or adhesive, and one side of the projection 14 may be connected to one contact piece 112, or both opposing sides of the projection 14 may be connected to two adjacent upper and lower contact pieces 112, or the projection 14 and the contact piece 112 may be formed integrally. The material of the projection 14 may be the same as or different from the material of the contact piece 112. The material of the projection 14 may be a conductive metal or an insulating material. Furthermore, the projection 14 can have great rigidity and can exert a great resistance against the deforming contact piece 112, preventing its deformation. Of course, the projection 14 can have a certain degree of flexibility and can act as a buffer when the projection 14 abuts against the other contact piece 112 when the contact piece 112 deforms due to electrical force, thereby extending the service life of the contact piece 112. The relationship between projection 14 and contact piece 112' is the same as described above, so it will not be repeated here.

[0051] The above-described connection method and characteristics for the projection 14 can be selected by those skilled in the art according to the actual situation, and there are no particular limitations here.

[0052] In some embodiments, as shown in Figures 5, 7, 10, and 12, the projection 14 is provided in the gap 1121 between at least one contact piece 11, 11' between adjacent bent pairs. That is, the projection 14 is provided in the gap 1121 between the contact pieces 112, 112' of the straight portion located between adjacent bent pairs. Based on the above embodiments, taking the contact piece 112 as an example, if the contact piece 112 is flexible, the contact piece 112 will deform due to the electric force, and the amount of deformation of the straight portion located between adjacent bent pairs will be greater. By placing the projection 14 in the gap 1121 between the contact pieces 112 of the straight portion, this deformation can be greatly reduced, that is, the situation in which both ends of the contact piece 11 lift up due to the large deformation of the straight portion can be avoided, and the stability of the contact pressure between the movable contact 12 and the fixed contact 13' of the other contact piece 11' can be ensured.

[0053] In some embodiments, as shown in Figures 6 and 7, there are multiple projections 14, and the multiple projections 14 are positioned in the gap 1121 between the contact pieces 112, 112' of at least one contact piece 11, 11'. In one of these contact pieces 11, the projections 14 are aligned in the projection direction Y, or the projections 14 are misaligned in the projection direction Y, or part of the projection 14 is aligned in the projection direction Y and other parts of the projection 14 are misaligned in the projection direction Y.

[0054] Of these, the alignment of multiple protrusions 14 in the protrusion direction Y can be understood as the alignment of the central axis 141 of the protrusion 14 in the extending direction of the protrusion 14 in the protrusion direction Y. When the flexibility of the contact pieces 112 and 112' is high, as shown in Figure 9, multiple protrusions 14 can be provided in each gap 1121 of the multiple contact pieces 112 and 112', and can also be provided in the most easily deformable part (for example, the straight part between two adjacent bending pairs), and the protrusions 14 are aligned in the protrusion direction Y, thereby minimizing deformation of this part. When the flexibility of the contact piece portions 11 and 11' is low, multiple protrusions 14 can be provided in one gap 1121, and the multiple protrusions 14 are arranged along the horizontal direction X within one gap 1121, that is, the multiple protrusions 14 are offset in the protrusion direction Y, thereby allowing the contact pieces 112 and 112' to be deformed uniformly or not deformed when subjected to an electric force. Taking the contact piece 112 as an example, depending on the deformation of the contact piece 112, multiple protrusions 14 can be provided in multiple gaps 1121 of each contact piece 112, and multiple protrusions 14 can be provided in each gap 1121. A person skilled in the art can set it according to the actual situation, and there are no particular limitations here. Of course, in order to reduce costs and simplify the manufacturing process, if the number and position of the protrusions 14 satisfy the deformation requirements of the contact piece 112, it is preferable to have fewer protrusions 14.

[0055] In some embodiments, as shown in Figures 8 and 9, the projection 14 is provided in the gap 1121 between the multiple contact pieces 112, 112' of the two contact pieces 11, 11'.

[0056] According to the above embodiment, a projection 14 can be provided in the gap 1121 between the multiple contact pieces 112, 112' of the contact pieces 11, 11' of the two movable contacts 1, 1'. In some embodiments, the number of projections 14 provided on the two contact pieces 11, 11' may be the same or different, and the positions of the projections 14 on the two contact pieces 11, 11' may be the same or different. In some embodiments, to simplify the manufacturing process, the number and positions of the projections 14 provided on the two contact pieces 11, 11' are the same. Those skilled in the art can set these according to the actual situation and are not particularly limited here.

[0057] In some embodiments, the projections 14 provided on the two contact pieces 11, 11' are aligned or offset in the projection direction Y. The central axes 141 of the projections 14 located on the two contact pieces 11, 11' may be aligned or offset in the projection direction Y, and can be set according to the actual conditions of the contact pieces 112, 112' as will be the case for those skilled in the art, and are not particularly limited here.

[0058] In some embodiments, the projection 14 is provided only in the gap 1121 between the multiple contact pieces 112, 112' in one of the contact piece portions 11, 11'. As shown in Figures 4 to 7, the projection 14 may be provided only on one of the contact piece portions 11. For example, the contact piece 112 of this contact piece portion 11 is highly flexible, and by providing the projection 14, it is possible to prevent the contact piece 112 from deforming significantly.

[0059] In some embodiments, in the protruding direction Y, the size h1 of the projection 14 is less than or equal to the size h2 of the gap 1121.

[0060] Specifically, as shown in Figure 10, in the protruding direction Y, the size h1 of the projection 14 is smaller than the size h2 of the gap 1121. Taking the contact piece 112 as an example, one side of the projection 14 is connected to the contact piece 112, and the other side has a gap between it and the adjacent contact piece 112. When the contact piece 112 is subjected to an electric force, the projection 14 does not immediately contact the other contact piece 112, but rather allows the contact piece 112 to deform to some extent before preventing further deformation. In this case, the contact piece 112 can be allowed to overtravel, increasing the contact pressure between the movable contact 12 and the fixed contact 13' of the other contact piece 11'. Depending on the deformation capacity of the contact piece 112, the size h1 of the projection 14 in the protruding direction Y can be appropriately adjusted, and furthermore, the size of the gap between the projection 14 and the adjacent contact piece 112 can be adjusted, allowing for flexible adjustment of the amount of deformation of the contact piece 112, so that the contact pressure between the movable contact 12 and the fixed contact 13' reaches an optimal value. The specific size of the projection 14 in the projection direction Y can be set according to actual conditions such as the amount of deformation of the contact piece 112 and the magnitude of the short-circuit current, and is not particularly limited here.

[0061] Therefore, the size, number, and position of the protrusions 14 can be changed according to the magnitude of the short-circuit current, allowing for flexible adjustment of the magnitude of the electric force acting on the contact pieces 112 and 112', and preventing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 13 from being excessive or insufficient.

[0062] In some embodiments, as shown in Figure 11, each movable contact 1 in the contact piece structure 100 further includes a first movable contact lead piece 151 and a second movable contact lead piece 152. One end of the first movable contact lead piece 151 is connected to a fixed contact 13 and the other end is connected to an external load. One end of the second movable contact lead piece 152 is connected to a fixed contact 13' and the other end is connected to an external load.

[0063] In summary, in the contact piece structure 100 in the embodiments of this disclosure, the contact piece portions 11 and 11' are provided with bent pairs, and the first distance d1 between the two bent portions in each bent pair is smaller than the second distance d2 between the ends of the two contact piece portions 11 and 11', thus reducing the distance between the two contact piece portions 11 and 11'. In a parallel circuit structure formed by two movable contacts 1 and 1', currents moving in the same direction attract each other, generating an electric force. Therefore, reducing the distance between the two contact piece portions 11 and 11' can increase the electric force between the two contact piece portions 11 and 11'. In addition, the upper ends of the two bent portions in each bent pair are parallel, reducing the horizontal component of the electric force. In addition, the bent portion increases the effective length of the contact pieces 11 and 11', further increasing the electrical force between the two contact pieces 11 and 11', thereby effectively increasing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 31, making them less likely to break and effectively resisting short-circuit currents.

[0064] As shown in Figures 13 to 15, embodiments of the present disclosure further provide a magnetic holding relay comprising a housing 200, at least one contact piece structure 100 as described in any of the above embodiments, a magnetic circuit structure 300, a push card 400, and a fixed frame 500.

[0065] As shown in Figures 13 to 15, the housing 200 comprises a base 21 and a cover 22. The contact piece structure 100 and the magnetic circuit structure 300 are both attached to the base 21, and the fixed frame 500 is attached to the magnetic circuit structure 300, covering the cover 22, so that the contact piece structure 100, the magnetic circuit structure 300, the push card 400, and the fixed frame 500 can be housed within this housing 200. In some embodiments, the magnetic circuit structure 300 includes a coil assembly 31, a yoke assembly 32, a rotating permanent magnet 33, and an armature 34. The coil assembly 31 comprises a coil frame 311 and a coil 312. The coil 312 is wound around the coil frame 311. The yoke assembly 32 comprises a first yoke 321 and a second yoke 322. The first yoke 321 and the second yoke 322 are located on opposite sides of the coil frame 311 in the axial direction, and the first yoke 321 and the second yoke 322 are fixed to the base 21. The rotating permanent magnet 33 is located on one side of the coil 312, and the permanent magnet 33 is positioned on the axis of rotation, and the permanent magnet can rotate about the axis of rotation 331. There are two armatures 34, each located on either side of the permanent magnet 33. One end of each armature 34 is connected to one end of the permanent magnet 33, and the other end is connected to the push card 400. One end of the push card 400 is connected to the compression spring 16 of the contact piece structure 100. The armature 34 can be formed integrally with the permanent magnet 33. The permanent magnet 33 is also called magnetic steel.

[0066] When a forward pulse voltage is applied to the coil 312, the coil 312, the yoke assembly 32, and the permanent magnet 33 form a magnetic field, causing the permanent magnet 33 to rotate around the rotation axis 331 and remain in a first rotation position. Accordingly, the armature 34 rotates and remains in the first rotation position together with the permanent magnet 33. The armature 34 drives the push card 400 to move, and the push card 400 drives the compression spring 16 to move, resulting in contact between the movable contacts 12, 12' and the fixed contacts 13', 13 of the contact piece structure 100. Even after the forward pulse voltage is removed, the magnetic force of the permanent magnet 33 is still present, allowing the movable contacts 12, 12' and the fixed contacts 13', 13 to remain in the ON state for an extended period of time.

[0067] When a reverse pulse voltage is applied to the coil 312, the coil 312, yoke assembly 32, and permanent magnet 33 form a magnetic field opposite to the magnetic field formed by the forward pulse voltage described above, causing the permanent magnet 33 to rotate in the reverse direction around the rotation axis 331 and remain in the second rotation position. Accordingly, the armature 34 rotates and remains in the second rotation position together with the permanent magnet 33. The armature 34 drives the push card 400 to move, which in turn pushes the compression spring 16, causing the movable contacts 12, 12' of the contact piece structure 100 to separate from the fixed contacts 13', 13. Even after the reverse pulse voltage is removed, the magnetism of the permanent magnet 33 is still present, so the movable contacts 12, 12' and the fixed contacts 13', 13 can remain in the off state for a long time until a forward pulse voltage is applied again to close the movable contacts 12, 12' and the fixed contacts 13', 13.

[0068] In some embodiments, as shown in Figures 13 and 15, the magnetic holding relay may include two sets of contact piece structures 100. The two sets of contact piece structures 100 are located on either side of the coil 312. The compression springs 16, 16' of each set of contact piece structures 100 are both connected to the push card 400, so that the movable contacts 12, 12' and fixed contacts 13', 13 of the two sets of contact piece structures 100 can be switched on and off simultaneously, resulting in the same on / off state for the two sets of contact piece structures 100 and facilitating control. By arranging two sets of contact piece structures 100, the number of leads of the magnetic holding relay can be increased, allowing more loads to be connected and improving the utilization rate of the magnetic holding relay.

[0069] Of course, in some embodiments, the magnetic holding relay may be provided with more sets of contact piece structures 100, such as 3 sets, 4 sets, or 5 sets. Those skilled in the art can install them according to their actual needs and conditions, and are not particularly limited here.

[0070] Since the contact piece structure 100 adopts the contact piece structure 100 described in any of the above embodiments, the specific structure of the contact piece structure 100 can be found in the description of any of the above embodiments and will not be described again here.

[0071] In summary, the magnetic holding relay according to the embodiment of the present disclosure comprises a contact piece structure 100 according to any of the above embodiments, wherein the contact pieces 11, 11' are provided with a bent pair, and the first distance d1 between the two bent portions in each bent pair is smaller than the second distance d2 between the ends of the two contact pieces 11, 11', thus reducing the distance between the two contact pieces 11, 11'. In a parallel circuit structure formed by two movable contacts 1, 1', currents moving in the same direction attract each other, generating an electric force. Therefore, reducing the distance between the two contact pieces 11, 11' can increase the electric force between the two contact pieces 11, 11'. At the same time, the upper ends of the two bent portions in each bent pair are parallel, reducing the horizontal component of the electric force. In addition, the bent portion increases the effective length of the contact pieces 11 and 11', further increasing the electrical force between the two contact pieces 11 and 11', thereby effectively increasing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 31, making them less likely to break and effectively resisting short-circuit currents.

[0072] Furthermore, in related technologies, because the rigidity of the contact pieces differs, when power is applied to the contact pieces, currents in the same direction attract each other, causing the contact pieces to deform due to the resulting electrical force. If the deformation is large, both ends of the contact piece tend to lift up, which reduces the contact pressure between the movable and fixed contacts, making it impossible to effectively resist the short-circuit current. At the same time, it becomes impossible to adjust the magnitude of the electrical force the contact piece receives in accordance with the magnitude of the short-circuit current.

[0073] Embodiments of the present disclosure further provide a contact piece structure and a magnetic holding relay that can effectively increase the contact pressure between a movable contact and a fixed contact, effectively resist short-circuit currents, and flexibly adjust the magnitude of the electrical force acting on the contact piece.

[0074] According to one aspect of the present disclosure, a contact piece structure is provided which includes two side-by-side movable contacts, each of which includes a contact piece portion, a movable contact, and a fixed contact.

[0075] The contact piece portion includes a plurality of stacked contact pieces, with gaps provided between adjacent contact pieces, and movable contacts and fixed contacts are provided at opposing ends of the contact piece portion, such that when the movable contacts and fixed contacts are closed, the two movable contacts form a parallel circuit structure, with the movable contacts and fixed contacts of one movable contact corresponding to the fixed contacts and movable contacts of the other movable contact. At least one of the movable contacts further comprises a projection positioned within the gap and connected to at least one of the contact pieces.

[0076] In some embodiments of the present disclosure, the projections are plurality, and the plurality of projections are provided in the gaps between the plurality of contact pieces in at least one of the contact piece portions. In one of the contact pieces, the protrusions are aligned in the protruding direction, or the protrusions are offset in the protruding direction, or a portion of the protrusions are aligned in the protruding direction.

[0077] In some embodiments of the present disclosure, the projection is provided in the gap between the plurality of contact pieces in two of the contact piece portions.

[0078] In some embodiments of the present disclosure, the number of protrusions on the two contact pieces may be the same or different.

[0079] In some embodiments of the present disclosure, the projections provided on the two contact pieces are aligned or offset in the direction of protrusion. In some embodiments of the present disclosure, the projection is provided only in the gap between the plurality of contact pieces in one of the contact piece portions.

[0080] In some embodiments of this disclosure, the size of the protrusion is less than or equal to the size of the gap in the protruding direction.

[0081] In some embodiments of the present disclosure, each contact piece has at least one bent portion, and the two bent portions of two contact pieces correspond one to one to form a bent pair, and the two bent portions in each bent pair protrude in the protruding direction. The projection is provided in the gap between at least one of the contact pieces between adjacent bent pairs.

[0082] In some embodiments of the present disclosure, the contact piece has a plurality of gaps, the plurality of gaps having different sizes.

[0083] Another aspect of this disclosure provides a magnetic holding relay comprising the contact piece structure described herein.

[0084] As can be seen from the technical proposal described above, this disclosure has at least one of the following advantages and positive effects.

[0085] In the embodiments of this disclosure, protrusions are provided in the gaps between the stacked contact pieces. When power is applied to the contact pieces, the protrusions resist deformation of the contact pieces, reducing the amount of deformation. As a result, the electrical force received by the contact pieces is transmitted to the movable and fixed contacts, increasing the contact pressure between the movable and fixed contacts and effectively resisting the short-circuit current. At the same time, the magnitude of the short-circuit current can be obtained according to the operating environment, and the amount of deformation of the contact pieces can be flexibly adjusted by the size and number of protrusions to prevent the contact pressure between the movable and fixed contacts from becoming excessive or insufficient.

[0086] Specific embodiments of this disclosure are described in detail below.

[0087] Embodiments of the present disclosure provide a contact piece structure 100. As shown in Figure 16, the contact piece structure 100 includes two parallel movable contacts 1, 1'. The two movable contacts 1, 1' have the same structure. Each movable contact 1, 1' comprises a contact piece portion 11, 11', movable contacts 12, 12', and fixed contacts 13, 13'. Taking the structure of movable contact 1 as an example, the contact piece portion 11 includes a plurality of stacked contact pieces 112, with gaps 1121 between adjacent contact pieces 112. The movable contacts 12 and fixed contacts 13 are provided at opposite ends of the contact piece portion 11. When the movable contacts 12, 12' and fixed contacts 13, 13 are closed, the movable contacts 12 and fixed contacts 13 in one movable contact 1 correspond to the fixed contacts 13' and movable contacts 12' in the other movable contact 1', respectively, so that the two movable contacts 1, 1' form a parallel circuit structure. At least one movable contactor 1, 1' also includes a projection 14 positioned within the gap 1121 and connected to at least one contact piece 112, 112'.

[0088] In the contact piece structure 100 of the embodiment of this disclosure, protrusions 14 are provided in the gaps 1121 between the stacked contact pieces 112(112'). When power is applied to the contact pieces 112(112'), the protrusions 14 resist the deformation of the contact pieces 112(112'), reducing the amount of deformation of the contact pieces 112(112'). As a result, the electrical force received by the contact pieces 112(112') is transmitted to the movable contact and the fixed contact, increasing the contact pressure between the movable contact and the fixed contact, and effectively resisting the short-circuit current. At the same time, the magnitude of the short-circuit current can be obtained according to the operating environment, and the amount of deformation of the contact pieces 112(112') can be flexibly adjusted in size and number of protrusions 14 to control the amount of deformation of the contact pieces 112(112'), preventing the contact pressure between the movable contact and the fixed contact from becoming excessive or insufficient.

[0089] The contact piece structure 100 according to the embodiments of this disclosure will be described in detail below.

[0090] In some embodiments, the movable contact 1 will be described as an example, as shown in Figures 16 to 19. The contact piece 11 includes a plurality of stacked contact pieces 112, with gaps 1121 between adjacent contact pieces 112, that is, the gaps 1121 differ in size in the protruding direction Y. The gaps 1121 between the plurality of contact pieces 112 of the contact piece 11 are located between the ends of the contact piece 11 where the movable contact 12 and the fixed contact 13 are provided, and the movable contact 12 and the fixed contact 13 can pass through the ends of the stacked plurality of contact pieces 112, respectively, so that the movable contacts 12, 12' and the fixed contacts 13', 13 in the two contact piece 11, 11' can contact each other. Of these, the protruding direction Y is the direction perpendicular to the surface of the contact pieces 112, 112'.

[0091] When the two movable contacts 1 and 1' are energized, the movable contact 12 and the fixed contact 13' come into contact, and the movable contact 12' and the fixed contact 13 come into contact, forming a parallel circuit between the two movable contacts 1 and 1', and the current flowing through the two contact pieces 11 and 11' is in the same direction. Due to the principle that currents flowing in the same direction attract each other, the two contact pieces 11 and 11' generate an electric force and will inevitably attract each other. By providing gaps 1121 between the multiple contact pieces 112, when each contact piece 112 deforms due to the electric force, the deformation of each contact piece 112 does not affect each other, and the stability of the electric force is ensured.

[0092] In fact, the electric force is formed by the Ampere force (Lorentz force). The two movable contacts 1 and 1' can be considered as two parallel conductors, and when the movable contacts 1 and 1' are energized, the two contact pieces 11 and 11' generate a magnetic field around them, and due to the action of the current and the magnetic field, one contact piece 11 receives the Ampere force of the other contact piece 11', causing them to attract each other. This attraction increases the contact pressure between the movable contacts 12 and 12' at both ends and the electrostatic contacts 13' and 13, causing them to be attracted to each other more firmly. If the contact piece has a certain degree of flexibility, when the contact piece 112 is subjected to an electric force, the contact piece 112 will bend in a direction toward the other contact piece 112' with its middle portion as a fulcrum. Because the deformation of the middle portion is large, both ends of the contact piece 112 will lift up in the opposite direction, and the contact pressure between the movable contact 12 and the fixed contact 13' tends to decrease. In the embodiment of this disclosure, a projection 14 is provided in the gap 1121, and when the contact pieces 112 and 112' deform due to an electric force, the projection 14 can resist the deformation of the contact pieces 112 and 112', that is, the projection 14 can reduce the amount of deformation of the contact pieces 112 and 112'. When the contact pieces 112 and 112' are flexible, the projection 14 prevents the contact pieces 112 and 112' from deforming excessively and causing both ends of the contact pieces 112 and 112' to lift up, ensures the stability of the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 13, and prevents the movable contacts 12 and 12' and the fixed contacts 13' and 13 from being separated by a repulsive force due to a short-circuit current.

[0093] Of these, the projection 14 can be connected to the contact piece 112 (taking the contact piece 112 as an example) by welding, screwing, or adhesive, and one side of the projection 14 may be connected to one contact piece 112, or both opposing sides of the projection 14 may be connected to two adjacent upper and lower contact pieces 112, or the projection 14 and the contact piece 112 may be formed integrally. The material of the projection 14 may be the same as or different from the material of the contact piece 112. The material of the projection 14 may be a conductive metal or an insulating material. Furthermore, the projection 14 can have great rigidity and can exert a great resistance against the deforming contact piece 112, preventing its deformation. Of course, the projection 14 can have a certain degree of flexibility and can act as a buffer when the projection 14 abuts against the other contact piece 112 when the contact piece 112 deforms due to electrical force, thereby extending the service life of the contact piece 112. The relationship between projection 14 and contact piece 112' is the same as described above, so it will not be repeated here.

[0094] The above-described connection method and characteristics for the projection 14 can be selected by those skilled in the art according to the actual situation, and there are no particular limitations here.

[0095] In some embodiments, as shown in Figures 16 and 19 to 25, there are multiple projections 14, and the multiple projections 14 are arranged in the gap 1121 between the contact pieces 112 and 112' of at least one contact piece 11 and 11'. In some of these embodiments, as shown in Figures 20 and 21, the projections 14 are aligned in the projection direction Y on one contact piece 11, or as shown in Figures 22 and 23, the projections 14 are offset in the projection direction Y, or as shown in Figure 24, a part of the projection 14 is aligned in the projection direction Y and the other part of the projection 14 is offset in the projection direction Y.

[0096] As shown in Figure 21, the alignment of multiple protrusions 14 in the protrusion direction Y can be understood as the alignment of the central axes 141 of the protrusions 14 in the extending direction of the protrusions 14 in the protrusion direction Y. When the flexibility of the contact pieces 112 and 112' is high, the multiple protrusions 14 can be provided in each gap 1121 of the multiple contact pieces 112 and 112', and can also be provided in the most deformable part, with the central axes 141 of the protrusions 14 aligned in the protrusion direction Y, thereby minimizing deformation of this part. When the flexibility of the contact pieces 11 and 11' is low, multiple protrusions 14 can be provided in one gap 1121, and the multiple protrusions 14 are arranged along the horizontal direction X within one gap 1121, that is, the central axes 141 of the multiple protrusions 14 are offset in the protrusion direction Y, thereby allowing the contact pieces 112 and 112' to be deformed uniformly or not deformed when subjected to an electric force. Taking the contact piece 112 as an example, depending on the deformation of the contact piece 112, multiple protrusions 14 can be provided in the multiple gaps 1121 of each contact piece 112, and multiple protrusions 14 can be provided in the multiple gaps 1121 of each contact piece 1121, and those skilled in the art can set it according to the actual situation, and it is not particularly limited here. Of course, in order to reduce costs and simplify the manufacturing process, if the number and position of the protrusions 14 satisfy the deformation requirements of the contact piece 112, then fewer protrusions 14 are preferable. Here, the horizontal direction X can be defined as the direction in which the contact piece 112 extends and which is perpendicular to the protruding direction Y.

[0097] In some embodiments, as shown in Figure 16, the projection 14 is provided in the gap 1121 between multiple contact pieces 112, 112' of two contact pieces 11, 11'.

[0098] According to the above embodiment, as shown in Figures 16 and 17, projections 14 can be provided in the gaps 112, 112' between multiple contact pieces 112, 112' of the contact pieces 11, 11' of the two movable contacts 1, 1'. In some embodiments, the number of projections 14 provided on the two contact pieces 11, 11' may be the same or different, and the positions of the projections 14 on the two contact pieces 11, 11' may be the same or different. In some embodiments, to simplify the manufacturing process, the number and positions of the projections 14 provided on the two contact pieces 11, 11' are the same. Those skilled in the art can set these according to the actual situation and are not particularly limited here.

[0099] In some embodiments, as shown in Figures 16 and 24, the projections 14 on the two contact pieces 11 and 11' are aligned or offset in the protruding direction Y. The projections 14 at the same positions on the two contact pieces 11 and 11' may be aligned or offset in the protruding direction Y, and can be set according to the actual situation of the contact pieces 112 and 112' as those skilled in the art will know, and are not particularly limited here. In some embodiments, as shown in Figures 20 to 23, the projection 14 is provided only in the gap 1121 between the multiple contact pieces 112, 112' in one of the contact piece portions 11, 11'. That is, the projection 14 may be provided only on one of the contact piece portions 11. For example, the contact piece 112 of the contact piece portion 11 is highly flexible, and by providing the projection 14, it is possible to prevent the contact piece 112 from deforming significantly.

[0100] In some embodiments, as shown in Figures 21, 23, and 10, the size of the projection 14 in the projection direction Y is less than or equal to the size of the gap 1121.

[0101] Specifically, as shown in Figure 25, the size h1 of the projection 14 is smaller than the size h2 of the gap 1121. Taking the contact piece 112 as an example, one side of the projection 14 is connected to the contact piece 112, and the other side has a gap between it and the adjacent contact piece 112. When the contact piece 112 is subjected to an electric force, the projection 14 does not immediately contact the other contact piece 112, but rather allows the contact piece 112 to deform to some extent before preventing further deformation. In this case, the contact piece 112 can be allowed to overtravel, increasing the contact pressure between the movable contact 12 and the fixed contact 13' of the other contact piece 11'. Depending on the deformation capacity of the contact piece 112, the size h1 of the projection 14 in the projection direction Y can be appropriately adjusted, and furthermore, the size of the gap between the projection 14 and the adjacent contact piece 112 can be adjusted, allowing for flexible adjustment of the amount of deformation of the contact piece 112, so that the contact pressure between the movable contact 12 and the fixed contact 13' reaches an optimal value. The specific size of the projection 14 in the projection direction Y can be set according to actual conditions such as the amount of deformation of the contact piece 112 and the magnitude of the short-circuit current, and is not particularly limited here.

[0102] Therefore, the size, number, and position of the protrusions 14 can be changed according to the magnitude of the short-circuit current, allowing for flexible adjustment of the magnitude of the electric force acting on the contact pieces 112 and 112', and preventing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 13 from being excessive or insufficient.

[0103] In some embodiments, as shown in Figures 16, 18-19, each contact piece 11, 11' has at least one bent portion, and the bent portions of two contact pieces 11, 11' are arranged in a one-to-one correspondence to form a bent pair. In each bent pair, the two bent portions protrude along the projection direction Y, and the projection 14 is provided in the gap between at least one contact piece 11, 11' between adjacent bent pairs.

[0104] As shown in Figure 16, the bent portion is formed by bending the contact piece 11, and this bent portion can protrude along the protrusion direction Y. The protrusion direction Y includes a first direction Y1 and a second direction Y2 on opposite sides. If there is one bent pair, the bent pair may protrude in the first direction Y1 or in the second direction Y2. If there are multiple bent pairs, all of the multiple bent pairs may protrude in the first direction Y1, all of them may protrude in the second direction Y2, or some of the bent pairs may protrude in the first direction Y1 and other parts of the bent pairs may protrude in the second direction Y2, and are not particularly limited.

[0105] The two bent portions in a bent pair are a first bent portion 111 and a second bent portion 11', and at least a portion of the first bent portion 111 is housed in a space (not shown) formed by the protruding portion of the second bent portion 111', such that the first gap d1 between the two bent portions in each bent pair is smaller than the second gap d2 between the ends of the two contact pieces 11, 11'.

[0106] When the two movable contacts 1 and 1' are energized, the movable contact 12 and the fixed contact 13' come into contact, and the movable contact 12' and the fixed contact 13 come into contact, forming a parallel circuit. The currents flowing through the two contact pieces 11 and 11' are in the same direction. Due to the principle that currents flowing in the same direction attract each other, the two contact pieces 11 and 11' will inevitably attract each other. However, at the bend, the first distance d1 between the two contact pieces 11 and 11' becomes smaller, increasing the electrical force that attracts the two contact pieces 11 and 11' to each other. At the same time, the bend increases the effective length of the contact pieces 11 and 11', increasing the contact pressure between the movable contacts 12 and 12' and the fixed contacts 13' and 13. This prevents the movable contacts 12 and 12' and the fixed contacts 13' and 13 from separating due to the repulsive force caused by the short-circuit current, thus ensuring the stability of the circuit operation by withstanding the short-circuit current.

[0107] In some embodiments, the upper ends of the two bends in each bend pair are parallel. The bends may be trapezoidal, rectangular, square, or polygonal. This results in the electrical forces acting on the two bends being perpendicular to themselves, and no oblique electrical forces being generated, thus reducing the horizontal X component of the electrical force and increasing the electrical force acting on each contact piece 11, 11'. Continuing to refer to Figure 16, the side walls of multiple bends can also be parallel to each other, resulting in the maximization of the attractive force between the two contact pieces 11, 11' and further increasing the electrical force.

[0108] In some embodiments, as shown in Figures 16 and 17, the contact pieces 11 and 11' each have multiple gaps 1121, and the size h2 of the multiple gaps 1121 is different. That is, the multiple gaps 1121 have different sizes in the protruding direction Y. Therefore, the multiple gaps 1121 can be provided with protrusions 14 of different sizes.

[0109] By providing gaps 1121 between multiple contact pieces 112 (112'), when each contact piece 112 is deformed by an electric force, the deformation of each contact piece 112 does not affect each other, ensuring stability of the electric force received. Furthermore, the magnitude of the electric force received by the contact pieces 112 and 112' can be flexibly adjusted by changing the number, position, and size of the protrusions 14, the number of bending pairs, the degree of bending of the bending parts, or by changing the first spacing d1 between the bending parts in each bending pair, depending on the magnitude of the short-circuit current. Here, the degree of bending of the bending part can be determined as the dimension from the upper wall to the opening along the protruding direction Y of the bending part.

[0110] In some embodiments, the projection 14 is connected to the position of maximum deformation in the contact piece. The position of maximum deformation refers to the position where the deformation of the contact pieces 112, 112' is greatest after the contact piece structure 100 is energized. In some embodiments, the projection 14 is located in the gap 1121 between the multiple contact pieces 112, 112' in the straight portion between the two connected bent pairs of contact piece portions 11, 11'. By positioning the projection 14 at the position where the deformation of the contact pieces 112, 112' is greatest, excessive deformation of the contact pieces 112, 112' can be prevented, thereby ensuring the stability of the electrical force.

[0111] In some embodiments, as shown in Figures 20, 22, and 24, each movable contact 1 in the contact piece structure 100 further includes a first movable contact lead piece 151 and a second movable contact lead piece 152. One end of the first movable contact lead piece 151 is connected to a fixed contact 13, and the other end is connected to an external load. One end of the second movable contact lead piece 152 is connected to a fixed contact 13', and the other end is connected to an external load. In some embodiments, as shown in Figure 16, the movable contacts 1, 1' of the contact piece structure 100 further include compression springs 16, 16', taking the movable contact 1 as an example, one end of the compression spring 16 is connected to the movable contact 12 and the other end is connected to the push card 400 of the magnetic holding relay.

[0112] In summary, protrusions 14 are provided in the gaps 1121 between the stacked contact pieces 112 and 112'. When power is applied to the contact pieces 112 and 112', the protrusions 14 resist the deformation of the contact pieces 112 and 112', reducing the amount of deformation. As a result, the electrical force received by the contact pieces 112 and 112' is transmitted to the movable and fixed contacts, increasing the contact pressure between the movable and fixed contacts and effectively resisting the short-circuit current. At the same time, the magnitude of the short-circuit current can be obtained according to the operating environment, and the amount of deformation of the contact pieces 112 and 112' can be flexibly adjusted to prevent the contact pressure between the movable and fixed contacts from becoming excessive or insufficient.

[0113] As shown in Figures 26 to 28, embodiments of the present disclosure further provide a magnetic holding relay comprising a housing 200, at least one contact piece structure 100 as described in any of the above embodiments, a magnetic circuit structure 300, a push card 400, and a fixed frame 500.

[0114] As shown in Figure 26, the housing 200 comprises a base 21 and a cover 22. The contact piece structure 100 and the magnetic circuit structure 300 are both attached to the base 21, and the fixed frame 500 is attached to the magnetic circuit structure 300 and covers the cover 22, allowing the contact piece structure 100, the magnetic circuit structure 300, the push card 400, and the fixed frame 500 to be housed within the housing 200.

[0115] In some embodiments, the magnetic circuit structure 300 includes a coil assembly 31, a yoke assembly 32, a rotating permanent magnet 33, and an armature 34. The coil assembly 31 comprises a coil frame 311 and a coil 312. The coil 312 is wound around the coil frame 311. The yoke assembly 32 comprises a first yoke 321 and a second yoke 322. The first yoke 321 and the second yoke 322 are located on opposite sides of the coil frame 311 in the axial direction, and the first yoke 321 and the second yoke 322 are fixed to the base 21. The rotating permanent magnet 33 is located on one side of the coil 312, and the permanent magnet 33 is positioned on the axis of rotation, and the permanent magnet can rotate about the axis of rotation 331. There are two armatures 34, each located on either side of the permanent magnet 33. One end of each armature 34 is connected to one end of the permanent magnet 33, and the other end is connected to the push card 400. One end of the push card 400 is connected to the compression spring 16 of the contact piece structure 100. The armature 34 can be formed integrally with the permanent magnet 33. The permanent magnet 33 is also called magnetic steel.

[0116] When a forward pulse voltage is applied to the coil 312, the coil 312, the yoke assembly 32, and the permanent magnet 33 form a magnetic field, causing the permanent magnet 33 to rotate around the rotation axis 331 and remain in a first rotation position. Accordingly, the armature 34 rotates and remains in the first rotation position together with the permanent magnet 33. The armature 34 drives the push card 400 to move, and the push card 400 drives the compression spring 16 to move, resulting in contact between the movable contacts 12, 12' and the fixed contacts 13', 13 of the contact piece structure 100. Even after the forward pulse voltage is removed, the magnetic force of the permanent magnet 33 is still present, allowing the movable contacts 12, 12' and the fixed contacts 13', 13 to remain in the ON state for an extended period of time.

[0117] When a reverse pulse voltage is applied to the coil 312, the coil 312, yoke assembly 32, and permanent magnet 33 form a magnetic field opposite to the magnetic field formed by the forward pulse voltage described above, causing the permanent magnet 33 to rotate in the reverse direction around the rotation axis 331 and remain in the second rotation position. Accordingly, the armature 34 rotates and remains in the second rotation position together with the permanent magnet 33. The armature 34 drives the push card 400 to move, which in turn pushes the compression spring 16, causing the movable contacts 12, 12' of the contact piece structure 100 to separate from the fixed contacts 13', 13. Even after the reverse pulse voltage is removed, the magnetism of the permanent magnet 33 is still present, so the movable contacts 12, 12' and the fixed contacts 13', 13 can remain in the off state for a long time until a forward pulse voltage is applied again to close the movable contacts 12, 12' and the fixed contacts 13', 13.

[0118] In some embodiments, as shown in Figure 27, the magnetic holding relay may include two sets of contact piece structures 100. The two sets of contact piece structures 100 are located on both sides of the coil 312. The compression springs 16, 16' of each set of contact piece structures 100 are both connected to the push card 400, so that the movable contacts 12, 12' and fixed contacts 13', 13 of the two sets of contact piece structures 100 can be switched on and off simultaneously, resulting in the same on / off state for the two sets of contact piece structures 100 and facilitating control. By arranging two sets of contact piece structures 100, the number of leads of the magnetic holding relay can be increased, allowing more loads to be connected and improving the utilization rate of the magnetic holding relay.

[0119] Of course, in some embodiments, the magnetic holding relay may be provided with more sets of contact piece structures 100, such as 3 sets, 4 sets, or 5 sets. Those skilled in the art can install them according to their actual needs and conditions, and are not particularly limited here.

[0120] Since the contact piece structure 100 adopts the contact piece structure 100 described in any of the above embodiments, the specific structure of the contact piece structure 100 can be found in the description of any of the above embodiments and will not be described again here.

[0121] In summary, in the magnetic holding relay according to the embodiment of this disclosure, projections 14 are provided in the gaps 1121 between the stacked contact pieces 112 and 112'. When power is applied to the contact pieces 112 and 112', the projections 14 resist the deformation of the contact pieces 112 and 112', reducing the amount of deformation. As a result, the electrical force received by the contact pieces 112 and 112' is transmitted to the movable and fixed contacts, increasing the contact pressure between the movable and fixed contacts and effectively resisting the short-circuit current. At the same time, the magnitude of the short-circuit current can be obtained according to the operating environment, and the amount of deformation of the contact pieces 112 and 112' can be flexibly adjusted to prevent the contact pressure between the movable and fixed contacts from becoming excessive or insufficient.

[0122] The various embodiments / models provided in this disclosure can be combined with each other without contradiction, and their details are omitted here.

[0123] In the embodiments of the invention, the terms “first,” “second,” and “third” are used solely for illustrative purposes and are not intended to indicate or imply relative importance. The term “plural” means two or more unless otherwise specified. Terms such as “attach,” “connect,” “join,” and “fix” should be understood broadly. For example, “connect” may be a fixed connection, a removable connection, or an integral connection. “Connect” may be a direct connection or an indirect connection via an intermediate medium. The specific meanings of the above terms in the embodiments of this disclosure can be understood by those skilled in the art depending on the specific circumstances.

[0124] In the description of the embodiments of this disclosure, the orientations or positional relationships indicated by terms such as “up,” “down,” “left,” “right,” “front,” and “back” are orientations or positional relationships based on the drawings and are merely for the purpose of describing and simplifying the descriptions of the embodiments of this disclosure, and do not indicate or imply that the devices or units being referred to must have a particular orientation in order to be configured and operate in a particular orientation, nor should they be understood as limitations on the embodiments of the invention.

[0125] In this specification, terms such as “one embodiment,” “several embodiments,” and “specific embodiments” mean that a particular feature, structure, material, or characteristic described in relation to this embodiment or example is included in at least one embodiment or example of the embodiment of the invention. In this specification, the general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, any particular feature, structure, material, or characteristic described may be combined in an appropriate manner in any one or more embodiments or examples. The above are merely preferred embodiments of the invention and are not intended to limit the embodiments of the invention; to those skilled in the art, the embodiments of the invention are subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the invention are included within the scope of protection of the embodiments of the invention.

Claims

1. It has a contact piece structure, It includes two side-by-side movable contacts, each of which includes a contact piece, a movable contact, and a fixed contact. The contact piece portion includes a plurality of stacked contact pieces, with gaps provided between adjacent contact pieces. The movable contact and the fixed contact are provided at opposite ends of the contact piece. When the movable contact and the fixed contact are closed, the two movable contacts form a parallel circuit structure, such that the movable contact and the fixed contact of one movable contact correspond to the fixed contact and the movable contact of the other movable contact, respectively. At least one of the movable contacts further comprises a projection positioned within the gap and connected to at least one of the contact pieces. A contact piece structure characterized by the following:

2. The aforementioned protrusions are plurality, and the plurality of protrusions are provided in the gaps between the plurality of contact pieces in at least one of the contact piece portions. In one of the contact pieces, the protrusions are aligned in the vertical direction, or the protrusions are offset in the vertical direction, or a portion of the protrusions are aligned in the vertical direction. The contact piece structure according to claim 1, characterized by the features described above.

3. The projection is provided in the gap between the multiple contact pieces in the two contact piece portions. The contact piece structure according to claim 1 or 2, characterized by the above.

4. The number of protrusions on the two contact pieces is either the same or different. The contact piece structure according to claim 3.

5. The protrusions provided on the two contact pieces are either aligned or offset in the vertical direction. The contact piece structure according to feature 4.

6. The projection is provided only in the gap between the multiple contact pieces in one of the contact piece portions. The contact piece structure according to claim 1 or 2, characterized by the above.

7. In the vertical direction, the size of the projection is smaller than or equal to the size of the gap. The contact piece structure according to claim 1, characterized by the features described above.

8. Each contact piece has at least one bent portion, and the bent portions of two contact pieces correspond one to one to form a bent pair, and the two bent portions in each bent pair protrude in the vertical direction. The projection is provided in the gap between at least one of the contact pieces between adjacent bending pairs. The contact piece structure according to claim 1 or 2, characterized by the above.

9. The contact piece has a plurality of gaps, and the plurality of gaps have different sizes. The contact piece structure according to claim 1 or 2, characterized by the above.

10. A magnetic holding relay characterized by comprising the contact piece structure described in any one of claims 1 to 9.

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