Contact piece structure and magnetic latching relay

Abstract

Embodiments of the present disclosure provide a contact piece structure and a self-holding relay. The contact piece structure comprises two parallel movable contacts, each movable contact comprising a contact piece portion, a movable contact, and a fixed contact. 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, so that when the movable contact and the fixed contact are connected, the two movable contacts form a parallel circuit structure. Each contact piece portion has at least one bending portion, and the bending portions of the two contact pieces are arranged in a one-to-one correspondence to form a bending pair, wherein in each bending pair, the upper ends of the two bending portions are parallel, the two bending portions protrude along the same protruding direction, and the first gap between the two bending portions is smaller than the second gap between the two ends of the two contact pieces. The contact piece structure of the present disclosure can effectively increase the contact pressure between the movable contact and the fixed contact and further effectively resist short-circuit current.

Description

Technology Field

[0001] The present disclosure relates to the field of relay technology, and in particular to contact piece structures and self-holding relays. Background Technology

[0002] A self-holding relay is an automatic switch that turns a circuit on and off. The self-holding relay has a contact structure and a coil, and the contact structure has at least two contacts, one contact has a movable contact installed, and the other contact has a fixed contact installed, and when a forward pulse voltage is applied to the coil, the movable contact and the fixed contact come into contact and the circuit turns on, and when a reverse pulse voltage is applied to the coil, the movable contact and the fixed contact separate and the circuit turns off.

[0003] In related technologies, since short circuits are prone to occur in the circuit, it is necessary to improve the resistance of the self-holding relay to short-circuit current—that is, to increase the contact pressure between the movable contact and the fixed contact—so that the two are less likely to be severed by resisting the repulsive force generated when the short-circuit current passes through the movable contact and the fixed contact. However, related technologies are unable to effectively increase the contact pressure between the movable contact and the fixed contact.

[0004] The information disclosed in the above background technology section is intended merely to facilitate understanding of the background of the present disclosure and may include information that does not constitute related technology already known to those skilled in the art.

[0005] An embodiment of the present disclosure provides a contact piece structure capable of effectively increasing the contact pressure between a movable contact and a fixed contact, and further capable of effectively resisting a short-circuit current.

[0006] According to one embodiment of the present invention, a contact piece structure comprising two parallel movable contacts is provided, wherein each of the movable contacts comprises a contact piece portion, a movable contact, and a fixed contact.

[0007] A movable contact and a fixed contact are installed at opposite ends of the contact piece, and when the movable contact and the fixed contact are connected, the movable contact and the fixed contact of one movable contact correspond to the fixed contact and the movable contact of another movable contact, respectively, so that two movable contacts form a parallel circuit structure. Each of the contact pieces has at least one bending part, and the bending parts of the two contact pieces are arranged to correspond one-to-one to form a bending pair, and in each of the bending pairs, the upper ends of the two bending parts are parallel, the two bending parts protrude along the same protrusion direction, and the first gap between the two bending parts is smaller than the second gap between the two ends of the two contact pieces.

[0008] In some embodiments of the present disclosure, in the protruding direction, at least a portion of the first bending portion is received within the space formed by the protruding portion of the second bending portion.

[0009] In some embodiments of the present disclosure, the number of bending pairs is a plurality, and a third gap is provided between two contact pieces located between adjacent bending pairs, and the third gap is larger than the first gap.

[0010] In some embodiments of the present disclosure, the protrusion direction includes a first direction and a second direction opposite to each other, and in a plurality of the bending pairs, some of the bending pairs protrude in the first direction and other of the bending pairs protrude in the second direction.

[0011] In some embodiments of the present disclosure, in each of the bending pairs, the size of the opening of the second bending part is larger than the size of the top of the first bending part so that the top of the first bending part is received in the opening of the second bending part.

[0012] In some embodiments of the present disclosure, the shape of each of the bending portions is one of a trapezoid, a rectangle, a square, a pentagon, a hexagon, and an octagon.

[0013] In some embodiments of the present disclosure, each of the contact pieces comprises a plurality of stacked contact pieces, and a gap is provided between adjacent contact pieces.

[0014] In some embodiments of the present disclosure, the contact piece has a plurality of gaps installed in the stacking direction of the contact piece, and the sizes of the plurality of gaps are different.

[0015] In some embodiments of the present disclosure, the contact piece structure further includes a projection disposed in the gap and connected to at least one of the contact pieces.

[0016] In some embodiments of the present disclosure, the projection is installed in the gap of at least one of the contact pieces between adjacent bending pairs.

[0017] In some embodiments of the present disclosure, the projections are a plurality of, and the plurality of projections are installed in the gaps of the plurality of contact pieces of at least one contact piece, and in one contact piece, the projections are aligned in the protrusion direction, the projections are offset in the protrusion direction, or a portion of the projections are aligned in the protrusion direction.

[0018] In some embodiments of the present disclosure, the projection is installed in the gap between a plurality of the contact pieces of two of the contact pieces.

[0019] In some embodiments of the present disclosure, the number of protrusions installed on the two contact pieces is the same or different.

[0020] In some embodiments of the present disclosure, the projections installed on the two contact pieces are aligned or misaligned in the direction of the projection.

[0021] In some embodiments of the present disclosure, the projection is installed only in the gap between a plurality of the contact pieces of one of the contact pieces.

[0022] In some embodiments of the present disclosure, in the protruding direction, the size of the projection is less than or equal to the size of the gap.

[0023] One embodiment of the present disclosure also provides a self-holding relay having a contact piece structure described in any one of the embodiments.

[0024] As can be seen from the technical solution described above, the present disclosure has at least one of the following advantages and positive effects.

[0025] In an embodiment of the present disclosure, a bending pair is installed in the contact piece, and since the first gap between the two bending parts in each bending pair is smaller than the second gap between the two ends of the two contact pieces, the distance between the two contact pieces is reduced. In a parallel circuit structure formed by two movable contacts, currents in the same direction attract to generate an electric force, so reducing the distance between the two contact pieces can increase the electric force of the two contact pieces. At the same time, in each bending pair, the upper ends of the bending parts are parallel, and the horizontal component of the electric force is reduced. At the same time, the bending part increases the effective length of the contact piece, thereby further increasing the electric force of the two contact pieces, effectively increasing the contact pressure between the movable contact and the fixed contact, making it difficult for the two to separate, and effectively resisting short-circuit current. In addition, by arranging the bending pair, the electric force received by the contact piece can be flexibly adjusted according to the magnitude of the short-circuit current. Brief explanation of the drawing

[0026] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. FIG. 1 is a schematic front view of a contact piece structure illustrated in some embodiments of the present disclosure. FIG. 2 is a schematic three-dimensional structural diagram of a contact piece structure shown in some embodiments of the present disclosure. FIG. 3 is a schematic three-dimensional structural diagram of a contact piece structure from a different point in time as illustrated in some embodiments of the present disclosure. FIG. 4 is a schematic diagram of a movable contact in a contact piece structure shown in some embodiments of the present disclosure. Figure 5 is an enlarged view of part A of Figure 4. FIG. 6 is a schematic diagram of another movable contact of a contact piece structure shown in some embodiments of the present disclosure. Figure 7 is an enlarged view of part B of Figure 6. FIG. 8 is an exploded schematic diagram of a movable contact shown in some embodiments of the present disclosure. FIG. 9 is a schematic front view of a contact piece structure having a projection in an embodiment of the present disclosure. Figure 10 is an enlarged view of part C of Figure 9. FIG. 11 is a schematic front view of a contact piece structure shown in some embodiments of the present disclosure. Figure 12 is an enlarged view of part D of Figure 11. FIG. 13 is a three-dimensional schematic diagram of a self-holding relay shown in some embodiments of the present disclosure. FIG. 14 is a schematic plan view of a self-holding relay with the cover removed, as illustrated in some embodiments of the present disclosure. FIG. 15 is a schematic three-dimensional structural diagram of a self-holding relay with the cover and fixed frame removed, as illustrated in some embodiments of the present disclosure. FIG. 16 is a schematic front view of a contact piece structure shown in some embodiments of the present disclosure. Figure 17 is an enlarged view of part E of Figure 16. FIG. 18 is a schematic three-dimensional structural diagram of a contact piece structure shown in some embodiments of the present disclosure. FIG. 19 is an exploded schematic diagram of a movable contact shown in some embodiments of the present disclosure. FIG. 20 is a schematic front view of a contact piece structure illustrated in another embodiment of the present invention. Figure 21 is an enlarged view of part F of Figure 20. FIG. 22 is a schematic front view of a contact piece structure illustrated in another embodiment of the present invention. Figure 23 is an enlarged view of part G of Figure 22. FIG. 24 is a schematic front view of a contact piece structure shown in some embodiments of the present disclosure. Fig. 25 is an enlarged view of section H of Fig. 24. FIG. 26 is a three-dimensional schematic diagram of a self-holding relay shown in some embodiments of the present disclosure. FIG. 27 is a schematic plan view of a self-holding relay with the cover removed, as illustrated in some embodiments of the present disclosure. FIG. 28 is a schematic three-dimensional structural diagram of a self-holding relay with the cover and fixed frame removed, as illustrated in some embodiments of the present disclosure. Specific details for implementing the invention

[0027] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, exemplary embodiments may be implemented in various forms and should not be understood as being limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure comprehensive and complete and to convey the concept of the exemplary embodiments to those skilled in the art. Identical reference numerals in the drawings indicate identical or similar configurations, and their detailed description is omitted.

[0028] An embodiment of the present disclosure provides a contact piece structure (100). As illustrated in FIG. 1, the contact piece structure (100) comprises 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'), a movable contact (12, 12'), and a fixed contact (13, 13'), and the movable contact (12, 12') and the fixed contact (13, 13') are installed at opposite ends of the contact piece portion (11, 11'). When the movable contact (12, 12') and the fixed contact (13, 13') are connected, the movable contact (12) and the fixed contact (13) of one movable contact (1) correspond to the fixed contact (13') and the movable contact (12') of the other movable contact (1'), respectively, so that the two movable contacts (1, 1') form a parallel circuit structure. Each contact piece (11, 11') has at least one bending part, and the bending parts of the two contact pieces (11, 11') are arranged to correspond one-to-one to form a bending pair. In each bending pair, the upper ends of the two bending parts are parallel, the two bending parts protrude along the same protrusion direction (Y), and the first gap (d1) between the two bending parts is smaller than the second gap (d2) between the two ends of the two contact pieces (11, 11').

[0029] In the contact piece structure (100) of the embodiment of the present disclosure, a bending pair is installed in the contact piece (11, 11'), and since the first gap (d1) between the two bending parts in each bending pair is smaller than the second gap (d2) between the two ends of the two contact pieces (11, 11'), the distance between the two contact pieces (11, 11') is reduced, and in the parallel circuit structure formed by the two movable contactors (1, 1'), currents in the same direction are attracted to generate electric force, so when the distance between the two contact pieces (11, 11') is reduced, the electric force of the two contact pieces (11, 11') can be increased, and in each bending pair, the upper ends of the two bending parts are parallel, and the horizontal component of the electric force is reduced, so the electric force of the two contact pieces (11, 11') can be further increased. Therefore, the contact pressure between the movable contact (12, 12) and the fixed contact (13', 31) can be effectively increased, making it difficult for the two to separate, and can effectively resist short-circuit current.

[0030] Hereinafter, a contact piece structure (100) according to an embodiment of the present disclosure will be described in detail.

[0031] In some embodiments, a movable contactor (1) is described as an example as shown in FIGS. 1 to 4. The contact portion (11) of the movable contactor (1) includes a plurality of stacked contact portions (112), and a gap (1121) is provided between adjacent contact portions (112). In order for the movable contact (12, 12') and fixed contact (13', 13) of two contact portions (11, 11') to come into contact with each other, the movable contact (12) and the fixed contact (13) can pass through each end of the stacked plurality of contact portions (112).

[0032] In some embodiments, as illustrated in FIGS. 1 and 2, the first bending portion (111) is formed by bending the contact portion (11), and the first bending portion (111) may protrude along the protrusion direction (Y). The protrusion direction (Y) may be understood as a direction perpendicular to the surface of the contact portion (11), and as illustrated in FIG. 1, the protrusion direction (Y) includes an opposite first direction (Y1) and a second direction (Y2). If there is one bending pair, the bending pair may protrude in the first direction (Y1) or the second direction (Y2). If there are multiple bending pairs, all of the bending pairs may protrude in the first direction (Y1), or all of them may protrude in the second direction (Y2), or a part of the bending pair may protrude in the first direction (Y1) and the remainder of the bending pair may protrude in the second direction (Y2), and this is not particularly limited. When there are multiple bending pairs, the protrusion directions (Y) of the multiple bending pairs may not be the same, and as illustrated in FIG. 1, the protrusion directions (Y) of the bending pairs located on the left and right sides of FIG. 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). Accordingly, the protrusion direction (Y) of the bending pair described in the embodiment of the present disclosure indicates the direction in which the bending pair protrudes, and for example, the protrusion direction (Y) of the bending pair on the left is the first direction (Y1) rather than the second direction (Y2).

[0033] As illustrated in FIG. 4, since the contact piece (11) includes a plurality of stacked contact pieces (112), the size of the opening of the bending portion of each contact piece (112) may differ. The size of the opening can be understood as the size of the opening of the bending portion in the horizontal direction (X). The horizontal direction (X) is the extension direction of the contact piece (112) and can be defined as a direction perpendicular to the protrusion direction (Y).

[0034] In some embodiments, in each bending pair, at least a portion of the first bending portion (111) in the protruding direction (Y) is accommodated within a space (not shown) formed by the protruding portion of the second bending portion (111') so that the first gap (d1) between the two bending portions is smaller than the second gap (d2) between the two ends of the two contact portions (11, 11').

[0035] In some embodiments, as shown in FIGS. 3 and 4, in the contact piece (11), the stacked plurality of contact pieces (112) each have one sub-bending portion, and the size of the opening of the plurality of sub-bending portions gradually increases along the protrusion direction (Y). The plurality of sub-bending portions jointly form the bending portion of the contact piece (11).

[0036] In some embodiments, as shown in FIG. 1, in each bending pair, the size of the opening of the second bending part (111') is larger than the size of the top of the first bending part (111) so that the top of the first bending part (111) can be received in the opening of the second bending part (111').

[0037] Specifically, the size of the opening of the bending part refers to the size of the opening of the bending part along the horizontal direction (X), and the size of the top of the bending part refers to the maximum size of the top of the bending part in the horizontal direction (X). By doing so, the top of the first bending part (111) can be accommodated within the opening of the second bending part (111'), thereby reducing the first gap (d1) between the two bending parts in the bending pair. This first gap (d1) can be understood as the distance from the top of the first bending part (111) to the bottom of the second bending part (111) in the bending pair. Here, the top of the first bending part (111) refers to the top of the protruding part, and the bottom of the second bending part (111') refers to the part where the protruding part is closest to the first bending part (111). Accordingly, the first gap (d1) is reduced compared to the second gap (d2) between the ends of the two contact parts (11, 11'). Here, the second gap (d2) between the ends of the two contact parts (11, 11') can be understood as the distance between the ends having the movable contact (12, 12') and the fixed contact (13, 13') of the contact parts (11, 11').

[0038] When two movable contacts (1, 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, so that the two movable contacts (1, 1') form a parallel circuit, and the current flowing through the two contact parts (11, 11') is in the same direction. Based on the principle of attracting currents in the same direction, the two contact parts (11, 11') attract each other, but the first gap (d1) between the two contact parts (11, 11') in the bending part is reduced so that the electric force attracting the two contact parts (11, 11') to each other increases, and at the same time, the bending part increases the effective length of the contact parts (11, 11') to increase the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13), thereby preventing the movable contact (12, 12') and the fixed contact (13', 13) from being separated by a repulsive force caused by the short-circuit current, and can resist the short-circuit current and ensure the stability of the circuit operation.

[0039] In fact, the electric force is generated by the ampere force (Lorentz force). Two movable contacts (1, 1') can be considered as two parallel wires, and when the movable contacts (1, 1') are energized, the two contact parts (11, 11') generate a magnetic field around them, and due to the flow of current and the action of the magnetic field, one contact part (11) receives the ampere force of the other contact part (11'), and the two attract each other, and by the two attracting each other, the contact pressure between the movable contacts (12, 12') and the fixed contacts (13', 13) at both ends can be increased, and the two are more firmly attracted.

[0040] However, in some embodiments, for example, the contact piece (112) of the contact piece (11) has some degree of flexibility, that is, the contact piece (112) has low rigidity. This is because when the contact piece (112) is pushed to connect the movable contact (12) and the fixed contact (13') of another contact piece (11') and conduct current, if the contact piece (112) has some degree of elasticity that can cause overtravel, the contact between the movable contact (12) and the fixed contact (13') of another contact piece (11') becomes more stable and does not easily bounce. However, since the contact piece (112) has a certain degree of flexibility, when the contact piece (112) receives an electric force, the contact piece (112) bends in a direction approaching another contact piece (112') using its middle part as a support point, and because the amount of deformation in the middle part is large, the parts of both ends of the contact piece (112) rise in opposite directions. As shown in FIGS. 11 and 14, the movable contact (1, 1') of the contact piece structure (100) further includes a compression spring (16, 16'), and 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 self-holding relay. When the parts of both ends of the contact piece (112) rise, that is, when both ends of the movable contactor (1) rise, the compression spring (16) moves, and the movement of the compression spring (16) moves the push card (400), so the entire self-holding relay becomes unstable and may affect the electrical performance of the self-holding relay. To avoid this situation, in an embodiment of the present disclosure, when the number of bending pairs is set to multiple, the two contact parts (11, 11') located between adjacent bending pairs have a third gap (d3) that is larger than the first gap (d1).

[0041] That is, the distance between the straight portions located between two adjacent bending pairs in two contact portions (11, 11') can be greater than the distance between the two bending portions of one bending pair. In this way, the electric force received by the straight portion is smaller than the electric force received by the bending portion, and is greater than the electric force received by both ends of the contact portion (11, 11') where the movable contact (12, 12') and fixed contact (13, 13') are installed, so the amount of deformation is reduced, and the injury to both ends of the contact portion (11, 11') due to excessive deformation is avoided. At the same time, since there is a gap (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, that is, does not overlap, and the entire contact piece (11) is further prevented from being excessively deformed and affecting the contact pressure between the movable contact (12) and the fixed contact (13'). The contact piece (11') is identical to the contact piece (11), so the description is omitted.

[0042] In some embodiments, the third gap (d3) between the straight portions located between two adjacent bending pairs in the two contact portions (11, 11') may be less than the second gap (d2) between the two ends of the two contact portions (11, 11') (the two ends where the movable contact (12, 12') and the fixed contact (13, 13') are installed). Accordingly, the electric force received by the straight portions may be applied to the movable contact (12, 12) and the fixed contact (13, 13') to increase the contact pressure between the two.

[0043] 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 bending pairs in the two contact pieces (11, 11') may be larger than the second gap (d2) between the two ends of the two contact pieces (11, 11') (the two ends where the movable contact (12, 12') and the fixed contact (13, 13') are installed). Accordingly, when an electric force is applied, it is further possible to prevent the contact pieces (112, 112') from being excessively deformed and the ends of the contact pieces (112, 112') from lifting.

[0044] In some embodiments, the shape of the bending portion may be any shape among a trapezoid, a rectangle, a square, and other polygons. As illustrated in FIG. 1, in an embodiment of the present disclosure, the bending portion of the contact portion (11, 11') is a trapezoid, and the upper ends of the plurality of bending portions extend along the horizontal direction (X), that is, because the upper ends of the plurality of bending portions are parallel, the electric force received by the two bending portions is perpendicular to each of them, and since no electric force is generated in the inclined direction, the component of the electric force along the horizontal direction (X) is reduced, and the electric force received by each contact portion (11, 11') is increased. Referring further to FIG. 1, the side walls of the plurality of bending portions may also be parallel to each other, so that the force of attraction between the two contact portions (11, 11') is maximized and the electric force can be further increased.

[0045] In some embodiments, the shape of the bending part may be a rectangle, a square, and other polygons, and the polygon may be a pentagon, a hexagon, an octagon, etc., and it is sufficient to ensure that the tops of the two bending parts in each bending pair are parallel to each other.

[0046] In some embodiments, adjacent bending pairs have different shapes. For example, the shape of the two bending parts of the first bending pair is trapezoidal, the shape of the two bending parts of the adjacent second bending pair is square, the shape of the two bending parts of the adjacent third bending pair is rectangular, and the shape of the two bending parts of the adjacent fourth bending pair is polygonal.

[0047] In some embodiments, the shape of the bending portion of each bending pair may differ. For example, in one bending pair, the first bending portion (111) is trapezoidal and the second bending portion (111') is square, and in one bending pair, the first bending portion (111) is rectangular and the second bending portion (111') is pentagonal. Even if the shapes of the bending portions in the bending pair are identical or different, their top ends are parallel to each other, and those skilled in the art may choose according to actual circumstances and are not particularly limited herein.

[0048] In some embodiments, to facilitate manufacturing and extend the service life of the contact piece (112, 112'), the top of the bending piece and two side walls are transformed into an arc shape.

[0049] In some embodiments, as illustrated in FIG. 1, the contact piece (11) has a plurality of gaps (1121) in the stacking direction, and the sizes of the plurality of gaps (1121) are different. That is, the sizes of the plurality of gaps (1121) in the protrusion direction (Y) are different.

[0050] Specifically, as illustrated in FIG. 1, the contact piece (11) is described as an example. The gap (1121) between the plurality of contact pieces (112) of the contact piece (11) is located between the two ends of the contact piece (11) where the movable contact (12) and the fixed contact (13) are installed, and since this gap (1121) is formed between adjacent sub-bending parts, the size of the gap (1121) can be determined according to the degree of bending of the sub-bending part. Accordingly, the contact piece structure (100) according to the embodiment of the present disclosure can flexibly adjust the size of the gap (1121) between each contact piece (112). The degree of bending can be understood as the dimension from the upper wall to the opening along the protrusion direction (Y) of the sub-bending part. By installing a gap (1121) between 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, thereby ensuring the stability of the electric force received. In addition, the magnitude of the electric force received by the contact pieces (112, 112') can be flexibly adjusted by changing the number of bending pairs, the degree of bending of the bending part, or the first gap (d1) between the bending parts of each bending pair according to the magnitude of the short-circuit current.

[0051] In some embodiments, as shown in FIGS. 4 to 12, the contact piece structure (100) further includes a projection (14) disposed in a gap (1121) and connected to at least one contact piece portion (112, 112). A protrusion (14) is installed in the gap (1121), and when the contact piece (112, 112') is deformed by electric force, the protrusion (14) can resist the deformed part of the contact piece (112, 112'). That is, the protrusion (14) can reduce the amount of deformation of the contact piece (112, 112), and when the contact piece (112, 112') has flexibility, the protrusion (14) prevents the contact piece (112, 112') from being excessively deformed and the parts of both ends of the contact piece (112, 112') from rising, secures the stability of the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13), and prevents the movable contact (12, 12') and the fixed contact (13', 13) from being separated by a repulsive force caused by a short-circuit current.

[0052] Here, the protrusion (14) may be connected to a contact piece (112) (using the contact piece (112) as an example) by welding, screw connection, or joining, and one side of the protrusion (14) may be connected to a single contact piece (112), or opposite sides of the protrusion (14) may be connected to two adjacent upper and lower contact pieces (112), or the protrusion (14) and the contact piece (112) may be formed integrally. The material of the protrusion (14) may be the same as or different from the material of the contact piece (112). The material of the protrusion (14) may be a conductive metal or an insulating material. In addition, the protrusion (14) may have high rigidity and may exert a high resistance action on the deformed contact piece (112) to prevent deformation. Of course, the protrusion (14) can have a certain degree of flexibility, and when the contact piece (112) is deformed by receiving an electric force, if the protrusion (14) comes into contact with another contact piece (112), it can act as a buffer and extend the service life of the contact piece (112). Since the relationship between the protrusion (14) and the contact piece (112') is the same as above, it is not repeated here.

[0053] Regarding the aforementioned connection method and characteristics for the projection (14), those skilled in the art may select according to actual circumstances, and there are no special limitations.

[0054] In some embodiments, as illustrated in FIGS. 5, 7, 10 and 12, the projection (14) is installed in the gap (1121) of at least one contact piece (11, 11') between adjacent bending pairs. That is, the projection (14) is installed in the gap (1121) of the contact piece (112, 112') of the straight portion located between adjacent bending pairs. Based on the above-described embodiment, taking the contact piece (112) as an example, when the contact piece (112) has flexibility, the contact piece (112) is deformed by receiving an electric force, and the amount of deformation of the straight portion located between adjacent bending pairs is relatively large. By installing a protrusion (14) in the gap (1121) between the contact pieces (112) of the straight portions, such deformation can be greatly reduced, that is, the situation in which both ends of the contact piece (11) rise due to large deformation of the straight portions is avoided, and the stability of the contact pressure between the movable contact (12) and the fixed contact (13') of another contact piece (11') can be secured.

[0055] In some embodiments, as shown in FIGS. 6 and 7, the projections (14) are a plurality of times, and the plurality of projections (14) are installed in the gap (1121) of the contact pieces (112, 112') of at least one contact piece (11, 11'). Here, in one contact piece (11), the projections (14) are aligned in the protrusion direction (Y), the projections (14) are misaligned in the protrusion direction (Y), or part of the projections (14) is aligned in the protrusion direction (Y) and other part of the projections (14) is misaligned in the protrusion direction (Y).

[0056] Here, the alignment of multiple protrusions (14) in the protrusion direction (Y) can be understood as the central axis (141) of the protrusion (14) in the extension direction of the protrusion (14) being aligned in the protrusion direction (Y). When the flexibility of the contact pieces (112, 112') is high, as shown in FIG. 9, multiple protrusions (14) can be installed in each gap (1121) of the multiple contact pieces (112, 112'), and can also be installed in the part most prone to deformation (e.g., the straight part between two adjacent bending pairs), and the protrusions (14) can be aligned in the protrusion direction (Y) to minimize deformation of this part. In cases where the flexibility of the contact piece (11, 11') is low, multiple protrusions (14) may be installed in a single gap (1121), and the multiple protrusions (14) may be arranged along the horizontal direction (X) in the single gap (1121), that is, the multiple protrusions (14) may be arranged offset in the protruding direction (Y), so that when an electric force is received, the contact piece (112, 112) may be deformed evenly or not deformed. Taking the contact piece (112) as an example, depending on the deformation of the contact piece (112), multiple protrusions (14) may be installed in the multiple gaps (1121) of each contact piece (112), and multiple protrusions (14) may be installed in each gap (1121). A person skilled in the art may set this according to the actual situation, and it is not particularly limited here. Of course, to reduce costs and simplify the manufacturing process, the number of protrusions (14) and their placement positions satisfy the deformation requirements of the contact piece (112), so the fewer the number of protrusions (14), the better.

[0057] In some embodiments, as shown in FIGS. 8 and 9, the projection (14) is installed in the gap (1121) between a plurality of contact pieces (112, 112') of two contact pieces (11, 11').

[0058] According to the above embodiment, protrusions (14) can be installed in the gaps (1121) of the plurality of contact pieces (112, 112') of the contact pieces (11, 11') of the two movable contactors (1, 1'). In some embodiments, the number of protrusions (14) installed in the two contact pieces (11, 11') may be the same or different, and the positions of the protrusions (14) in 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 protrusions (14) installed in the two contact pieces (11, 11') are the same. Those skilled in the art may set this according to actual circumstances and are not specifically limited here.

[0059] In some embodiments, the protrusions (14) installed on the two contact parts (11, 11') are aligned or offset in the protrusion direction (Y). The central axis (141) of the protrusions (14) located on the two contact parts (11, 11') may be aligned or offset in the protrusion direction (Y), and a person skilled in the art may set it according to the actual situation of the contact parts (112, 112'), and is not particularly limited thereto.

[0060] In some embodiments, the projection (14) is installed only in the gap (1121) between a plurality of contact pieces (112, 112') in a single contact piece (11, 11'). As shown in FIGS. 4 to 7, the projection (14) may be installed only in a single contact piece (11). For example, the contact piece (112) of this contact piece (11) has high flexibility, and by installing the projection (14), the contact piece (112) can be prevented from being significantly deformed.

[0061] In some embodiments, in the protrusion direction (Y), the size (h1) of the projection (14) is less than or equal to the size (h2) of the gap (1121).

[0062] Specifically, as illustrated in FIG. 10, in the protrusion 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 adjacent contact pieces (112). When the contact piece (112) receives an electric force, the projection (14) does not immediately come into contact with the other contact piece (112), but rather allows the contact piece (112) to have a certain amount of deformation and then prevents deformation. In this case, the contact piece (112) can be over-traveled, and the contact pressure between the movable contact (12) and the fixed contact (13') of the other contact piece (11') is increased. Depending on the deformation capability of the contact piece (112), the size (h1) of the protrusion (14) in the protrusion direction (Y) can be appropriately adjusted, and the size of the gap between the protrusion (14) and the adjacent contact piece (112) can also be adjusted. Since the amount of deformation of the contact piece (112) can be flexibly adjusted, the contact pressure between the movable contact (12) and the fixed contact (13') is made to reach the most appropriate value. The specific size of the protrusion (14) in the protrusion direction (Y) can be set according to actual conditions such as the amount of deformation of the contact piece (112) or the size of the short-circuit current, and is not specifically limited here.

[0063] Accordingly, depending on the magnitude of the short-circuit current, the size, number, and position of the protrusions (14) can be changed, and the magnitude of the electric force received by the contact pieces (112, 112') can be flexibly adjusted so that the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13) does not become excessive or insufficient.

[0064] In some embodiments, as illustrated in FIG. 11, each movable contact (1) of the contact piece structure (100) further comprises a first movable contact pull-out piece (151) and a second movable contact pull-out piece (152). One end of the first movable contact pull-out 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 pull-out piece (152) is connected to a fixed contact (13'), and the other end is connected to an external load.

[0065] In summary, in the contact piece structure (100) of the embodiment of the present disclosure, a bending pair is installed in the contact piece portions (11, 11'), and since the first gap (d1) between the two bending portions in each bending pair is smaller than the second gap (d2) between the two ends of the two contact pieces (11, 11'), the distance between the two contact pieces (11, 11') is reduced, and since currents in the same direction are attracted to generate electric force in the parallel circuit structure formed by the two movable contactors (1, 1'), the electric force of the two contact pieces (11, 11') can be increased when the distance between the two contact pieces (11, 11') is reduced. At the same time, in each bending pair, the upper ends of the two bending portions are parallel, and the horizontal component of the electric force is reduced. At the same time, the bending part can increase the effective length of the contact parts (11, 11') to further increase the electric force of the two contact parts (11, 11'), thereby effectively increasing the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13), making it difficult for the two to separate, and effectively resisting short-circuit current.

[0066] As illustrated in FIGS. 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) described in any one of the embodiments, a magnetic circuit structure (300), a push card (400), and a fixed frame (500).

[0067] Here, as illustrated in FIGS. 13 to 15, the housing (200) includes a base (21) and a cover (22). Both the contact piece structure (100) and the magnetic circuit structure (300) are mounted on the base (21), and the fixed frame (500) is mounted on the magnetic circuit structure (300). The contact piece structure (100), the magnetic circuit structure (300), the push card (400), and the fixed frame (500) can be accommodated within the housing (200) by covering with the cover (22).

[0068] In some embodiments, the magnetic circuit structure (300) includes a coil assembly (31), a yoke assembly (32), a rotary permanent magnet (33), and an armature (34). The coil assembly (31) includes a coil frame (311) and a coil (312). The coil (312) is wound around the coil frame (311). The yoke assembly (32) includes a first yoke (321) and a second yoke (322). The first yoke (321) and the second yoke (322) are located on axial sides of the coil frame (311), and the first yoke (321) and the second yoke (322) are fixed to a base (21). The rotary permanent magnet (33) is positioned on one side of the coil (312), and the permanent magnet (33) is positioned on a rotation axis, and the permanent magnet can rotate about the rotation axis (331). There are two armatures (34), each positioned on both sides 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 a push card (400). One end of the push card (400) is connected to a 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 a magnet steel.

[0069] 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, and the permanent magnet (33) rotates around the rotation axis (331) and is maintained in a first rotational position. The armature (34) rotates accordingly and is maintained in the first rotational position together with the permanent magnet (33). The armature (34) moves the push card (400), and the push card (400) moves the compression spring (16), so that the movable contacts (12, 12') of the contact piece structure (100) come into contact with the fixed contacts (13', 13). Since the magnetism of the permanent magnet (33) still exists even after the forward pulse voltage is removed, the movable contacts (12, 12') and the fixed contacts (13', 13) can maintain contact for a long period of time.

[0070] When a reverse pulse voltage is applied to the coil (312), the coil (312), the yoke assembly (32), and the permanent magnet (33) form a magnetic field opposite to the magnetic field formed by the forward pulse voltage described above, and the permanent magnet (33) rotates in the reverse direction around the rotation axis (331) and is maintained in a second rotation position. Accordingly, the armature (34) rotates and is maintained in the second rotation position together with the permanent magnet (33). The armature (34) moves the push card (400), and the push card (400) moves the compression spring (16), causing the movable contact (12, 12') of the contact piece structure (100) to be separated from the fixed contact (13', 13). Since the magnetism of the permanent magnet (33) still exists even when the reverse pulse voltage is removed, the movable contact (12, 12') and the fixed contact (13', 13) can remain separated for a long period of time until the forward pulse voltage is applied again and the movable contact (12, 12') and the fixed contact (13', 13) are connected.

[0071] In some embodiments, as illustrated in FIGS. 13 and 15, the self-holding relay may include two sets of contact piece structures (100). The two sets of contact piece structures (100) are placed on both sides of the coil (312). The compression springs (16, 16') of each set of contact piece structures (100) are all 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 connected or separated simultaneously, so that the connection and separation states of the two sets of contact piece structures (100) are identical, making control easier. By placing two sets of contact piece structures (100), the number of output terminals of the self-holding relay can be increased so that the self-holding relay can connect more loads, and the utilization of the self-holding relay can be improved.

[0072] Of course, in some embodiments, the self-holding relay may provide more sets of contact piece structures (100), such as 3 sets, 4 sets, or 5 sets. Those skilled in the art may install them according to actual needs and conditions, and are not particularly limited here.

[0073] Since the contact piece structure (100) uses the contact piece structure (100) described in any one of the above embodiments, the specific structure of the contact piece structure (100) may be described by referring to the description of any one of the above embodiments and is not described again here.

[0074] In summary, the self-holding relay according to the embodiment of the present disclosure includes a contact piece structure (100) according to the above-described embodiment, and a bending pair is installed in the contact piece portions (11, 11'). Since the first gap (d1) between the two bending portions in each bending pair is smaller than the second gap (d2) between the two ends of the two contact piece portions (11, 11'), the distance between the two contact piece portions (11, 11') is reduced. In a parallel circuit structure formed by two movable contactors (1, 1'), currents in the same direction are attracted to generate an electric force. Therefore, when the distance between the two contact piece portions (11, 11') is reduced, the electric force of the two contact piece portions (11, 11') is increased, and at the same time, in each bending pair, the upper ends of the two bending portions become parallel, and the horizontal component of the electric force is reduced, and at the same time, the bending portion increases the effective length of the contact piece portions (11, 11'). The electric force of the two contact parts (11, 11') can be further increased, thereby effectively increasing the contact pressure between the movable contact (12, 12') and the fixed contact (13, 13'), making it difficult for the two to separate, and effectively resisting short-circuit current.

[0075] In addition, in the related technology, since the rigidity of the contact pieces is different, when power is applied to the contact pieces, currents in the same direction attract each other, and the contact pieces receive an electric force and deform. When the deformation is large, both ends of the contact pieces tend to float, and furthermore, the contact pressure between the movable contact and the fixed contact decreases, making it impossible to effectively resist the short-circuit current, and at the same time, the magnitude of the electric force received by the contact pieces cannot be adjusted according to the magnitude of the short-circuit current.

[0076] Embodiments of the present disclosure further provide a contact piece structure and a self-holding relay that can effectively increase the contact pressure between a movable contact and a fixed contact, effectively resist short-circuit current, and flexibly adjust the magnitude of the electric force received by the contact piece.

[0077] According to one embodiment of the present invention, a contact piece structure comprising two parallel movable contacts is provided, wherein each of the movable contacts comprises a contact piece portion, a movable contact, and a fixed contact.

[0078] The above contact piece includes a plurality of stacked contact pieces, and a gap is provided between adjacent contact pieces.

[0079] The above-mentioned movable contact and fixed contact are installed at opposite ends of the above-mentioned contact piece, and when the above-mentioned movable contact and fixed contact are connected, the movable contact and fixed contact of one of the above-mentioned movable contacts each correspond to the fixed contact and movable contact of another of the above-mentioned movable contacts, so that two of the above-mentioned movable contacts form a parallel circuit structure.

[0080] At least one of the above-mentioned movable contacts further includes a projection disposed in the gap and connected to at least one of the above-mentioned contact pieces.

[0081] In some embodiments of the present disclosure, the projections are a plurality of, and the plurality of projections are installed in the gaps of the plurality of contact pieces of at least one contact piece, and

[0082] In one of the above contact parts, the projection is aligned in the protrusion direction, the projection is misaligned in the protrusion direction, or a part of the projection is aligned in the protrusion direction.

[0083] In some embodiments of the present disclosure, the projection is installed in the gap between a plurality of the contact pieces of two of the contact pieces.

[0084] In some embodiments of the present disclosure, the number of protrusions installed on the two contact pieces is the same or different.

[0085] In some embodiments of the present disclosure, the projections installed on the two contact pieces are aligned or misaligned in the direction of the projection.

[0086] In some embodiments of the present disclosure, the projection is installed only in the gap between a plurality of the contact pieces of one of the contact pieces.

[0087] In some embodiments of the present disclosure, in the protruding direction, the size of the projection is less than or equal to the size of the gap.

[0088] In some embodiments of the present disclosure, each contact piece has at least one bending portion, and the bending portions of two contact pieces are arranged in a one-to-one correspondence to form a bending pair, and in each of the bending pair, the two bending portions protrude along a protrusion direction, and

[0089] The above-mentioned protrusion is installed in the gap of at least one of the contact pieces between adjacent bending pairs.

[0090] In some embodiments of the present disclosure, the contact piece has a plurality of gaps, and the plurality of gaps have different sizes.

[0091] According to another aspect of the present invention, a self-holding relay comprising a contact piece structure described in the present invention is provided.

[0092] As can be seen from the technical solution described above, the present disclosure has at least one of the following advantages and positive effects.

[0093] In the embodiment of the present disclosure, protrusions are installed in the gaps between stacked contact pieces, and when power is applied to the contact pieces, the protrusions resist deformation of the contact pieces and reduce the amount of deformation of the contact pieces. Consequently, the electric force received by the contact pieces can be transmitted further to the movable contact and the fixed contact, the contact pressure between the movable contact and the fixed contact is increased, and the short-circuit current can be effectively resisted. At the same time, the magnitude of the short-circuit current can be obtained according to the usage environment, and the amount of deformation of the contact pieces is controlled by flexibly adjusting the size and number of protrusions, so that the contact pressure between the movable contact and the fixed contact does not become excessive or insufficient.

[0094] Specific embodiments of the present disclosure will be described in detail below.

[0095] An embodiment of the present disclosure provides a contact piece structure (100). As illustrated in FIG. 16, the contact piece structure (100) comprises 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'), a movable contact (12, 12'), and a fixed contact (13, 13'). Taking the structure of the movable contact (1) as an example, the contact piece portion (11) comprises a plurality of stacked contact pieces (112), and a gap (1121) exists between adjacent contact pieces (112). The movable contact (12) and the fixed contact (13) are installed at opposite ends of the contact piece portion (11). When the movable contact (12, 12') and the fixed contact (13, 13') are connected, the movable contact (12) and the fixed contact (13) of one movable contact (1) correspond to the fixed contact (13') and the movable contact (12') of the other movable contact (1'), respectively, so that the two movable contacts (1, 1') form a parallel circuit structure. At least one movable contact (1, 1') further includes a projection (14) that is disposed in the gap (1121) and connected to at least one contact piece (112, 112').

[0096] In the contact piece structure (100) of the embodiment of the present disclosure, a protrusion (14) is installed in the gap (1121) of the stacked contact pieces (112 (112')). When power is supplied to the contact pieces (112 (112')), the protrusion (14) resists deformation of the contact pieces (112 (112')) and reduces the amount of deformation of the contact pieces (112 (112')). Therefore, the electric force received by the contact pieces (112 (112')) can be transmitted to the movable contact and the fixed contact, the contact pressure between the movable contact and the fixed contact is increased, and the short-circuit current can be effectively resisted. At the same time, the magnitude of the short-circuit current can be obtained according to the usage environment, and the amount of deformation of the contact pieces (112 (112')) is controlled by flexibly adjusting the size and number of the protrusions (14), so that the contact pressure between the movable contact and the fixed contact does not become excessive or insufficient.

[0097] Hereinafter, a contact piece structure (100) according to an embodiment of the present disclosure will be described in detail.

[0098] In some embodiments, as illustrated in FIGS. 16 to 19, a movable contactor (1) is described as an example. The contact portion (11) includes a plurality of stacked contact portions (112), and a gap (1121) is provided between adjacent contact portions (112). That is, the plurality of gaps (1121) have different sizes in the protrusion direction (Y). In order for the movable contact (12, 12') and fixed contact (13', 13) of two contact portions (11, 11') to come into contact with each other, the movable contact (12) and the fixed contact (13) can pass through both ends of the stacked plurality of contact portions (112), respectively. Here, the protrusion direction (Y) is a direction perpendicular to the surface of the contact portion (112, 112').

[0099] When two movable contacts (1, 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, so that the two movable contacts (1, 1') form a parallel circuit structure, and the current flowing through the two contact parts (11, 11') is in the same direction. By the principle that currents in the same direction attract, the two contact parts (11, 11') generate an electric force and attract each other. By installing a gap (1121) between the multiple contact parts (112), when each contact part (112) is deformed by receiving an electric force, the deformation of each contact part (112) does not affect each other, and furthermore, the stability of the received electric force can be secured.

[0100] In fact, the electric force is generated by the ampere force (Lorentz force). Two movable contacts (1, 1') can be considered as two parallel wires, and when the movable contacts (1, 1') are energized, the two contact parts (11, 11') generate a magnetic field around them, and due to the action of the current and the magnetic field, one contact part (11) receives the ampere force of the other contact part (11'), and the two attract each other, and by the two attracting each other, the contact pressure between the movable contacts (12, 12') and the fixed contacts (13', 13) at both ends can be increased, and the two are more firmly attracted.

[0101] When the contact piece has a certain degree of flexibility, when the contact piece (112) receives an electric force, the contact piece (112) bends in a direction approaching another contact piece (112') using its middle portion as a support point, and because the amount of deformation in the middle portion is large, the portions of both ends of the contact piece (112) rise in opposite directions, and the contact pressure between the movable contact (12) and the fixed contact (13') tends to decrease. In the embodiment of the present disclosure, a protrusion (14) is installed in the gap (1121), and when the contact pieces (112, 112') are deformed by receiving an electric force, the protrusion (14) can resist the deformed portion of the contact piece (112, 112'). That is, the protrusion (14) can reduce the amount of deformation of the contact piece (112, 112'), and if the contact piece (112, 112') has flexibility, the protrusion (14) prevents the contact piece (112, 112') from being excessively deformed and the parts of both ends of the contact piece (112, 112') from rising, secures the stability of the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13), and prevents the movable contact (12, 12') and the fixed contact (13', 13) from being separated by a repulsive force caused by a short-circuit current.

[0102] Here, the protrusion (14) may be connected to a contact piece (112) (using the contact piece (112) as an example) by welding, screw connection, or joining, and one side of the protrusion (14) may be connected to a single contact piece (112), or opposite sides of the protrusion (14) may be connected to two adjacent upper and lower contact pieces (112), or the protrusion (14) and the contact piece (112) may be formed integrally. The material of the protrusion (14) may be the same as or different from the material of the contact piece (112). The material of the protrusion (14) may be a conductive metal or an insulating material. In addition, the protrusion (14) may have high rigidity and may exert a high resistance action on the deformed contact piece (112) to prevent deformation. Of course, the protrusion (14) can have a certain degree of flexibility, and when the contact piece (112) is deformed by receiving an electric force, if the protrusion (14) comes into contact with another contact piece (112), it can act as a buffer and extend the service life of the contact piece (112). Since the relationship between the protrusion (14) and the contact piece (112') is the same as above, it is not repeated here.

[0103] Regarding the aforementioned connection method and characteristics for the projection (14), those skilled in the art may select according to actual circumstances, and there are no special limitations.

[0104] In some embodiments, as shown in FIGS. 16 and FIGS. 19 through 25, the projections (14) are a plurality of, and the plurality of projections (14) are installed in the gap (1121) of the contact pieces (112, 112') of at least one contact piece (11, 11'). Here, as shown in FIGS. 20 and 21, in one contact piece (11), the projections (14) are aligned in the protrusion direction (Y), or as shown in FIGS. 22 and 23, the projections (14) are misaligned in the protrusion direction (Y), or as shown in FIG. 24, part of the projections (14) are aligned in the protrusion direction (Y) and other part of the projections (14) are misaligned in the protrusion direction (Y).

[0105] Here, as illustrated in FIG. 21, the alignment of a plurality of protrusions (14) in the protrusion direction (Y) can be understood as the central axis (141) of the protrusion (14) in the extension direction of the protrusion (14) being aligned in the protrusion direction (Y). When the flexibility of the contact pieces (112, 112') is high, a plurality of protrusions (14) can be installed in each gap (1121) of the plurality of contact pieces (112, 112'), and can also be installed in the part most prone to deformation, and the central axis (141) of the protrusion (14) is aligned in the protrusion direction (Y), thereby minimizing deformation of this part. In cases where the flexibility of the contact piece (11, 11') is low, multiple protrusions (14) may be installed in a single gap (1121), and the multiple protrusions (14) may be arranged along the horizontal direction (X) in the single gap (1121), that is, the central axis (141) of the multiple protrusions (14) may be arranged offset from the protrusion direction (Y), so that when an electric force is received, the contact piece (112, 112) may be deformed evenly or not deformed. Taking the contact piece (112) as an example, depending on the deformation of the contact piece (112), multiple protrusions (14) may be installed in the multiple gaps (1121) of each contact piece (112), and multiple protrusions (14) may be installed in each gap (1121). A person skilled in the art may set this according to the actual situation, and it is not particularly limited here.

[0106] Of course, to reduce costs and simplify the manufacturing process, the number of protrusions (14) and their placement positions satisfy the deformation requirements of the contact piece (112), so the fewer the number of protrusions (14), the better. Here, the horizontal direction (X) is the extension direction of the contact piece (112) and can be defined as a direction perpendicular to the protrusion direction (Y).

[0107] In some embodiments, as shown in FIG. 16, the projection (14) is installed in the gap (1121) between a plurality of contact pieces (112, 112') of two contact pieces (11, 11').

[0108] According to the above embodiment, as illustrated in FIGS. 16 and 17, protrusions (14) may be installed in the gaps (1121) of the plurality of contact pieces (112, 112') of the contact portions (11, 11') of two movable contactors (1, 1'). In some embodiments, the number of protrusions (14) installed in the two contact portions (11, 11') may be the same or different, and the positions of the protrusions (14) in the two contact portions (11, 11') may be the same or different. In some embodiments, to simplify the manufacturing process, the number and positions of the protrusions (14) installed in the two contact portions (11, 11') are the same. Those skilled in the art may set this according to actual circumstances and are not particularly limited here.

[0109] In some embodiments, as shown in FIGS. 16 and 24, the protrusions (14) installed on the two contact parts (11, 11') are aligned or offset in the protrusion direction (Y). The protrusions (14) at the same location on the two contact parts (11, 11') may be aligned or offset in the protrusion direction (Y), and a person skilled in the art may set them according to the actual situation of the contact parts (112, 112'), and are not particularly limited thereto.

[0110] In some embodiments, as shown in FIGS. 20 to 23, the protrusion (14) is installed only in the gap (1121) between a plurality of contact pieces (112, 112') in a single contact piece (11, 11'). That is, the protrusion (14) may be installed only in a single contact piece (11). For example, the contact piece (112) of the contact piece (11) has high flexibility, and by installing the protrusion (14), the contact piece (112) can be prevented from being significantly deformed.

[0111] In some embodiments, as shown in FIG. 21, FIG. 23 and FIG. 10, in the protrusion direction (Y), the size of the protrusion (14) is less than or equal to the size of the gap (1121).

[0112] Specifically, as illustrated in FIG. 25, in the protrusion 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 adjacent contact pieces (112). When the contact piece (112) receives an electric force, the projection (14) does not immediately come into contact with the other contact piece (112), but allows the contact piece (112) to have a certain amount of deformation and then prevents deformation. In this case, the contact piece (112) can be over-traveled, and the contact pressure between the movable contact (12) and the fixed contact (13') of the other contact piece (11') is increased. Depending on the deformation capability of the contact piece (112), the size (h1) of the protrusion (14) in the protrusion direction (Y) can be appropriately adjusted, and the size of the gap between the protrusion (14) and the adjacent contact piece (112) can also be adjusted. Since the amount of deformation of the contact piece (112) can be flexibly adjusted, the contact pressure between the movable contact (12) and the fixed contact (13') is made to reach the most appropriate value. The specific size of the protrusion (14) in the protrusion direction (Y) can be set according to actual conditions such as the amount of deformation of the contact piece (112) or the size of the short-circuit current, and is not specifically limited here.

[0113] Accordingly, depending on the magnitude of the short-circuit current, the size, number, and position of the protrusions (14) can be changed, and the magnitude of the electric force received by the contact pieces (112, 112') can be flexibly adjusted so that the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13) does not become excessive or insufficient.

[0114] In some embodiments, as illustrated in FIGS. 16, 18 to 19, each contact piece (11, 11') has at least one bending part, and the bending parts of two contact pieces (11, 11') are arranged in a one-to-one correspondence to form a bending pair. In each bending pair, the two bending parts protrude along the protrusion direction (Y), and a projection (14) is installed in the gap between at least one contact piece (11, 11') between adjacent bending pairs.

[0115] As illustrated in FIG. 16, the bending portion is formed by bending the contact portion (11), and the bending portion may protrude along the protrusion direction (Y). The protrusion direction (Y) includes an opposite first direction (Y1) and a second direction (Y2). If there is only one bending pair, the bending pair may protrude in the first direction (Y1) or the second direction (Y2). If there are multiple bending pairs, all of the bending pairs may protrude in the first direction (Y1), or all of them may protrude in the second direction (Y2), or a part of the bending pair may protrude in the first direction (Y1) and the remaining part of the bending pair may protrude in the second direction (Y2), and this is not particularly limited.

[0116] In a bending pair, the two bending parts are each a first bending part (111) and a second bending part (11), and in each bending pair, at least a portion of the first bending part (111) is accommodated within a space (not shown) formed by a protruding portion of the second bending part (111') so that the first gap (d1) between the two bending parts in each bending pair is smaller than the second gap (d2) between the two ends of the two contact parts (11, 11').

[0117] When two movable contacts (1, 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, so that the two movable contacts (1, 1') form a parallel circuit structure, and the current flowing through the two contact parts (11, 11') is in the same direction. Based on the principle of attracting currents in the same direction, the two contact parts (11, 11') attract each other, but the first gap (d1) between the two contact parts (11, 11') in the bending part is reduced so that the electric force attracting the two contact parts (11, 11') to each other increases, and at the same time, the bending part increases the effective length of the contact parts (11, 11') to increase the contact pressure between the movable contact (12, 12') and the fixed contact (13', 13), thereby preventing the movable contact (12, 12') and the fixed contact (13', 13) from being separated by a repulsive force caused by the short-circuit current, and can resist the short-circuit current and ensure the stability of the circuit operation.

[0118] In some embodiments, the tops of the two bending portions in each bending pair are parallel. The shape of the bending portion may be any shape among trapezoids, rectangles, squares, and other polygons. Accordingly, the electric force received by the two bending portions is perpendicular to each of them, and since no electric force is generated in the inclined direction, the component of the electric force along the horizontal direction (X) is reduced, and the electric force received by each contact portion (11, 11') is increased. Referring further to FIG. 16, the side walls of the plurality of bending portions may also be parallel to each other, so that the force of attraction between the two contact portions (11, 11') is maximized and the electric force can be further increased.

[0119] In some embodiments, as shown in FIGS. 16 and 17, the contact portions (11, 11') each have a plurality of gaps (1121), and the sizes (h2) of the plurality of gaps (1121) are different. That is, the sizes of the plurality of gaps (1121) are different in the protrusion direction (Y). Accordingly, protrusions (14) of different sizes can be installed in the plurality of gaps (1121).

[0120] By installing a gap (1121) between multiple contact pieces (112 (112')), when each contact piece (112) is deformed by receiving an electric force, the deformation of each contact piece (112) does not affect each other, and furthermore, the stability of the received electric force can be secured. In addition, depending on the magnitude of the short-circuit current, the magnitude of the electric force received by the contact pieces (112, 112') can be flexibly adjusted by changing the number, position, size, and number of bending pairs of protrusions (14) and the degree of bending of the bending part, or by changing the first gap (d1) between the bending parts in each bending pair. Here, the degree of bending of the bending part can be understood as the dimension from the upper wall to the opening along the protrusion direction (Y) of the bending part.

[0121] In some embodiments, the projection (14) is connected to a position having the maximum deformation of the contact piece. The position having the maximum deformation refers to the position where the deformation of the contact piece (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 a plurality of contact pieces (112, 112') in a straight section located between two connected bending pairs of the contact pieces (11, 11'). By installing the projection (14) at the position having the maximum deformation of the contact piece (112, 112'), excessive deformation of the contact piece (112, 112') can be prevented, thereby ensuring the stability of the electric force.

[0122] In some embodiments, as illustrated in FIGS. 20, 22 and 24, each movable contact (1) of the contact piece structure (100) further comprises a first movable contact pull-out piece (151) and a second movable contact pull-out piece (152). One end of the first movable contact pull-out 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 pull-out piece (152) is connected to a fixed contact (13'), and the other end is connected to an external load.

[0123] In some embodiments, as shown in FIG. 16, the movable contact (1, 1') of the contact piece structure (100) further includes a compression spring (16, 16'), and, for example, the movable contact (1), 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 self-holding relay.

[0124] In summary, a protrusion (14) is installed in the gap (1121) of the stacked contact pieces (112, 112'), and when power is supplied to the contact pieces (112, 112'), the protrusion (14) resists deformation of the contact pieces (112, 112') and reduces the amount of deformation of the contact pieces (112, 112'). Therefore, the electric force received by the contact pieces (112, 112') can be further transmitted to the movable contact and the fixed contact, the contact pressure between the movable contact and the fixed contact is increased, and the short-circuit current can be effectively resisted. At the same time, the magnitude of the short-circuit current can be obtained according to the usage environment, and the amount of deformation of the contact pieces (112, 112') is controlled by flexibly adjusting the size and number of the protrusions (14), so that the contact pressure between the movable contact and the fixed contact does not become excessive or insufficient.

[0125] As illustrated in FIGS. 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) described in any one of the embodiments, a magnetic circuit structure (300), a push card (400), and a fixed frame (500).

[0126] Here, as illustrated in FIG. 26, the housing (200) includes a base (21) and a cover (22). Both the contact piece structure (100) and the magnetic circuit structure (300) are mounted on the base (21), and the fixed frame (500) is mounted on the magnetic circuit structure (300). The contact piece structure (100), the magnetic circuit structure (300), the push card (400), and the fixed frame (500) can be accommodated within the housing (200) by covering with the cover (22).

[0127] In some embodiments, the magnetic circuit structure (300) includes a coil assembly (31), a yoke assembly (32), a rotary permanent magnet (33), and an armature (34). The coil assembly (31) includes a coil frame (311) and a coil (312). The coil (312) is wound around the coil frame (311). The yoke assembly (32) includes a first yoke (321) and a second yoke (322). The first yoke (321) and the second yoke (322) are located on axial sides of the coil frame (311), and the first yoke (321) and the second yoke (322) are fixed to a base (21). The rotary permanent magnet (33) is positioned on one side of the coil (312), and the permanent magnet (33) is positioned on a rotation axis, and the permanent magnet can rotate about the rotation axis (331). There are two armatures (34), each positioned on both sides 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 a push card (400). One end of the push card (400) is connected to a 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 a magnet steel.

[0128] 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, and the permanent magnet (33) rotates around the rotation axis (331) and is maintained in a first rotational position. The armature (34) rotates accordingly and is maintained in the first rotational position together with the permanent magnet (33). The armature (34) moves the push card (400), and the push card (400) moves the compression spring (16), so that the movable contacts (12, 12') of the contact piece structure (100) come into contact with the fixed contacts (13', 13). Since the magnetism of the permanent magnet (33) still exists even after the forward pulse voltage is removed, the movable contacts (12, 12') and the fixed contacts (13', 13) can maintain contact for a long period of time.

[0129] When a reverse pulse voltage is applied to the coil (312), the coil (312), the yoke assembly (32), and the permanent magnet (33) form a magnetic field opposite to the magnetic field formed by the forward pulse voltage described above, and the permanent magnet (33) rotates in the reverse direction around the rotation axis (331) and is maintained in a second rotation position. Accordingly, the armature (34) rotates and is maintained in the second rotation position together with the permanent magnet (33). The armature (34) moves the push card (400), and the push card (400) moves the compression spring (16), causing the movable contact (12, 12') of the contact piece structure (100) to be separated from the fixed contact (13', 13). Since the magnetism of the permanent magnet (33) still exists even when the reverse pulse voltage is removed, the movable contact (12, 12') and the fixed contact (13', 13) can remain separated for a long period of time until the forward pulse voltage is applied again and the movable contact (12, 12') and the fixed contact (13', 13) are connected.

[0130] In some embodiments, as illustrated in FIG. 27, the self-holding relay may include two sets of contact piece structures (100). The two sets of contact piece structures (100) are placed on both sides of the coil (312). The compression springs (16, 16') of each set of contact piece structures (100) are all 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 connected or separated simultaneously, so that the connection and separation states of the two sets of contact piece structures (100) are identical, making control easier. By placing two sets of contact piece structures (100), the number of output terminals of the self-holding relay can be increased so that the self-holding relay can connect more loads, and the utilization of the self-holding relay can be improved.

[0131] Of course, in some embodiments, the self-holding relay may provide more sets of contact piece structures (100), such as 3 sets, 4 sets, or 5 sets. Those skilled in the art may install them according to actual needs and conditions, and are not particularly limited here.

[0132] Since the contact piece structure (100) uses the contact piece structure (100) described in any one of the above embodiments, the specific structure of the contact piece structure (100) may be described by referring to the description of any one of the above embodiments and is not described again here.

[0133] In summary, in a self-holding relay according to an embodiment of the present disclosure, a protrusion (14) is installed in the gap (1121) of a stacked contact piece (112, 112'). When power is supplied to the contact piece (112, 112'), the protrusion (14) resists deformation of the contact piece (112, 112') and reduces the amount of deformation of the contact piece (112, 112'). Consequently, the electric force received by the contact piece (112, 112') can be transmitted to the movable contact and the fixed contact, the contact pressure between the movable contact and the fixed contact is increased, and the short-circuit current can be effectively resisted. At the same time, the magnitude of the short-circuit current can be obtained according to the usage environment, and the amount of deformation of the contact piece (112, 112') is controlled by flexibly adjusting the size and number of the protrusion (14), so that the contact pressure between the movable contact and the fixed contact does not become excessive or insufficient.

[0134] In addition, each embodiment / mode of the present invention may be combined with one another as long as no contradiction arises, and a description thereof is omitted herein.

[0135] In the embodiments of the invention, the terms "first," "second," and "third" are used solely for illustrative purposes and should not be understood as indicating or implying relative importance. The term "plural" means two or more, unless specifically limited. Terms such as "installation," "interconnected," "connection," and "fixing" should be understood broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral connection. "Interconnected" may be a direct connection or an indirect connection through an intermediate medium. In the embodiments of the invention, the specific meaning of the above terms may be understood by a person skilled in the art according to the specific circumstances.

[0136] In the description of the embodiments of the invention, 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 intended to facilitate the description of the embodiments of the invention and the simplification of the description; they do not indicate or imply that the device or unit referred to has a specific direction or needs to be configured and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the invention.

[0137] In the description of this specification, terms such as “one embodiment,” “some embodiments,” and “specific embodiments” mean that a specific feature, structure, material, or feature described in connection with such embodiment or example is included in at least one embodiment or example of the invention. A general expression of the terms described above in this specification does not necessarily refer to the same embodiment or example. Furthermore, the specific feature, structure, material, or feature described may be combined in an appropriate manner in any one or more embodiments or examples.

[0138] The foregoing is merely a preferred embodiment of the invention and is not intended to limit the embodiment of the invention; to those skilled in the art, various modifications and changes are possible to the embodiment of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiment of the invention shall be included within the scope of protection of the embodiment of the invention. Explanation of the symbols

[0139] 100 Contact piece structure; 1, 1' movable contact; 11, 11' contact piece section; 111 first bending section; 111', second bending section; 112, 112' contact piece; 1121 gap; 12, 12' movable contact; 13, 13' fixed contact; 14 projection; 141 central axis; 151 first movable contact pull-out piece; 152 second movable contact pull-out piece; 16, 16', compression 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 protrusion direction; Y1 first direction; Y2 second direction; d1 first gap; d2 second gap; d3 third gap; h1 size of the protrusion; h2 size of the gap.

Claims

Claim 1 A contact piece structure comprising two parallel movable contacts, wherein each of the movable contacts comprises a contact piece portion and a movable contact and a fixed contact installed at opposite ends of the contact piece portion, wherein the contact piece portion comprises a plurality of stacked contact pieces, a gap is provided between adjacent contact pieces, and when the movable contact and the fixed contact are connected, the movable contact and the fixed contact of one movable contact correspond to the fixed contact and the movable contact of another movable contact, respectively, so that the two movable contacts form a parallel circuit structure, and at least one of the movable contacts further comprises a projection disposed in the gap and connected to at least one of the contact pieces. Claim 2 A contact piece structure according to claim 1, wherein the projections are a plurality of, and the plurality of projections are installed in the gaps of the plurality of contact pieces of at least one contact piece, and in one contact piece, the projections are aligned in a vertical direction, the projections are misaligned in the vertical direction, or a portion of the projections are aligned in the vertical direction. Claim 3 A contact piece structure according to claim 1 or 2, characterized in that the projection is installed in the gap between a plurality of the contact pieces of two contact piece parts. Claim 4 A contact piece structure according to paragraph 3, characterized in that the number of protrusions installed on the two contact pieces is the same or different. Claim 5 A contact piece structure according to claim 4, characterized in that the protrusions installed on the two contact pieces are aligned or misaligned in a vertical direction. Claim 6 A contact piece structure according to claim 1 or 2, characterized in that the projection is installed only in the gap between a plurality of the contact pieces of one of the contact pieces. Claim 7 A contact piece structure according to claim 1, characterized in that, in the vertical direction, the size of the protrusion is smaller than or equal to the size of the gap. Claim 8 A contact piece structure according to claim 1 or 2, wherein each contact piece has at least one bending part, and the bending parts of two contact pieces are arranged in a one-to-one correspondence to form a bending pair, and in each of the bending pairs, the two bending parts protrude along a vertical direction, and the protrusion is installed in the gap of at least one contact piece between adjacent bending pairs. Claim 9 A contact piece structure according to claim 1 or 2, wherein the contact piece has a plurality of gaps and the sizes of the plurality of gaps are different. Claim 10 A self-holding relay characterized by having a contact piece structure as described in claim 1 or 2.

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