Magnetic latching relay

Abstract

The application relates to a magnetic holding relay, which comprises a cover, an electromagnetic coil assembly, a lever assembly, a push plate, a movable contact assembly connected to one end of the push plate, a static plate and a lead-out plate fixedly connected to the cover, and a static contact fixedly arranged on the static plate; the movable contact assembly comprises a movable contact, a movable contact support and a spring, the movable contact is fixed to the movable contact support, the movable contact support is in telescopic cooperation with the end of the push plate, the telescopic cooperation direction is consistent with the sliding direction of a corresponding sliding groove of the push plate, and the spring, which is used for stretching the movable contact support and the push plate, is arranged between the movable contact support and the push plate, that is, when the movable contact is not in contact with the static contact, the movable contact support is in a stretched in-place state relative to the end of the push plate under the action of the spring, when the push plate slides to the position where the movable contact is in contact with the static contact of the cover, the movable contact support is in a contracted state relative to the end of the push plate, the movable contact support is made of metal and is connected to the lead-out plate of the cover through flexible wires. The above structure is more reliable in work and has a longer service life.

Description

Technical Field

[0001] This invention relates to the field of relays, specifically a magnetic latching relay. Background Technology

[0002] A magnetic latching relay is an automatic switch that, like other electromagnetic relays, automatically connects and disconnects circuits. However, unlike other relays, the normally closed or normally open state of a magnetic latching relay relies entirely on the action of a permanent magnet. The switching state is triggered by a pulse signal of a certain width from the coil assembly. Existing conventional magnetic latching relays, such as the one published in Chinese patent literature (CN201112292Y, authorized on September 10, 2008, utility model titled "A Magnetic Latching Relay for Control"), have their electromagnetic and contact systems enclosed in a housing formed by a base and a top cover. The electromagnetic system includes a coil and an armature assembly. The armature assembly has a rotating shaft, which is positioned by positioning holes located on the top cover and the base. The armature assembly also has a transmission lever that extends out of the base, allowing the user to manually close or open the contacts. The contact system includes a stationary plate assembly and a moving plate assembly. The coil uses electromagnetic force to control the state of the armature assembly. The armature assembly contacts the push plate, which transmits the state changes of the armature assembly to the moving plate assembly. The moving plate assembly consists of a rivet, a moving spring, a conductive shunt plate, a moving contact, and a connecting plate. The aforementioned magnetic latching relay uses a conventional push plate and spring structure, where the push plate pushes the spring to make the moving contact contact the stationary contact. The disadvantages of this structure are: 1. The riveted structure of the spring and connecting plate is prone to fatigue at the riveting point, and the actual electrical life is only a few thousand to tens of thousands of cycles, making it difficult to achieve a long service life; 2. The spring has a reverse force during the rotation of the magnet assembly driven by the electromagnetic mechanism, resulting in the electromagnetic mechanism requiring a large driving force to achieve the pushing operation, and the power consumption of the electromagnetic coil assembly is high. Therefore, improvements to the existing magnetic latching relay are needed. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a magnetic latching relay that solves the technical problems of existing magnetic latching relays, which are prone to mechanical fatigue and have a short service life due to the use of a structure in which long springs and lead-out plates are riveted together. Furthermore, the springs always have a counterforce, resulting in a large driving force required for the electromagnetic mechanism and high power consumption of the electromagnetic coil assembly. This objective is achieved through the following technical solution.

[0004] A magnetic latching relay includes a housing, an electromagnetic coil assembly fixed within the housing, a control lever assembly that rotates relative to the housing in response to changes in the magnetic poles of the electromagnetic coil assembly, a push plate that slides in a directional manner relative to a corresponding groove within the housing, and a moving contact assembly connected at one end of the push plate. A stationary plate and a lead-out plate are fixedly connected to the housing. The stationary plate has a stationary contact fixedly mounted thereon, and the stationary contact is positioned opposite to the moving contact of the moving contact assembly. The key structural feature is that the moving contact assembly includes a moving contact, a moving contact support, and a spring. The moving contact is fixed to the moving contact support, and the moving contact… The head support is telescopically fitted relative to the end of the push plate, and the direction of this telescopic fit is consistent with the sliding direction of the push plate corresponding to the groove. A spring is provided between the moving contact support and the push plate to tension both in their telescopic states. That is, when the moving contact and the stationary contact are not in contact, the moving contact support is extended relative to the end of the push plate under the action of the spring. When the push plate slides until the moving contact contacts the stationary contact of the housing, the moving contact support is retracted relative to the end of the push plate. The moving contact support is made of metal and is connected to the lead-out piece of the housing via a flexible wire. With the above structure, the moving contact is supported by a spring, thus providing reliable contact support force for the contact between the moving contact and the stationary contact. Compared with the existing long spring structure, the moving contact and the stationary contact are in a straight line, resulting in more sensitive and reliable contact. The moving contact and the lead-out piece are connected by a wire, which has a better mechanical life than the existing spring riveting method. In addition, under the holding force of the spring, the moving contact support can provide a reverse thrust to the push plate when the push plate moves in the opposite direction, effectively reducing the kinetic energy requirement of the push plate, thereby reducing the power consumption of the electromagnetic coil assembly and making the relay more widely applicable.

[0005] The moving contact support is a metal plate bent at a right angle. One right-angled plate on one side of the metal plate is the top plate, and the moving contact is fixedly connected to the surface of the top plate. Limiting recesses are formed on both sides of the top plate. The other right-angled plate on the other side of the metal plate is the side plate. The surface of the side plate has a travel recess, and a first protrusion is provided near the right-angle bend on the outer side of the side plate, and a second protrusion is provided near the end of the plate. The first and second protrusions are perpendicular and of equal height to the side plate. The end of the push plate has a right-angled groove adapted to the sliding extension and retraction of the metal plate. The top groove of the right-angled groove corresponds to the top plate of the metal plate, and the side groove corresponds to the top plate of the metal plate. The side plate of the metal plate has a guide rib on one side of the top groove that forms a guiding sliding fit with the limiting recesses on both sides of the top plate. The direction of this guiding sliding fit is the direction of the metal plate's sliding extension and retraction relative to the right-angle groove. A spring is provided in the top groove to abut against the top plate of the metal plate. The side groove has a limiting block that fits with the travel recess of the side plate of the metal plate and restricts the metal plate from dislodging from the right-angle groove in the extension and retraction direction. When the push plate is slidably placed in the corresponding slide groove, the first protrusion and the second protrusion of the side plate of the metal plate abut against and limit the movement of the slide groove. The above is a specific implementation structure as a moving contact support. By limiting the movement of the moving contact support by abutting against the inner wall of the slide groove, the first protrusion and the second protrusion are more likely to dislodge from the push plate, making the sliding extension and retraction more reliable.

[0006] The cover has a V-shaped spring piece inside its groove, corresponding to the other end of the push plate. When the push plate slides to the point where the moving contact and the stationary contact are disconnected, the push plate compresses the V-shaped spring piece. At this time, the force exerted by the V-shaped spring piece on the push plate is the same as the force exerted by the spring when the moving contact and the stationary contact are in contact. This structure effectively reduces the power requirements of the electromagnetic coil assembly and the control lever assembly on the push plate, thereby reducing power consumption and broadening its applicability.

[0007] One side of the V-shaped spring is locked in place with the bottom of the groove in the cover. This structure ensures that the V-shaped spring is fixed in position relative to the cover, preventing it from loosening and ensuring stable deformation.

[0008] The push plate has a manual lever on its side that allows it to slide manually into position, and the cover has a travel opening on its side to accommodate the manual lever operation. This structure allows for manual switching of the relay in case of electrical control failure.

[0009] The electromagnetic coil assembly includes a coil support, an iron core, a coil, and a yoke. Specifically, the iron core is located in the middle of the coil support, and the coil is wound around it. Bent yokes are located at both ends of the coil support. The control lever assembly includes a housing, a permanent magnet placed inside the housing, and double-headed yokes on both sides of the housing that conduct magnetism with the permanent magnet. The control lever assembly magnetically engages with the yokes at both ends of the electromagnetic coil assembly through the interaction between the double-headed yokes on both sides. A control lever is located on one side of the housing, and a notch is provided on one side of the push plate to interact with the control lever. The above structure describes the specific implementation of the electromagnetic coil assembly and the control lever assembly.

[0010] The electromagnetic coil assembly is subjected to positive and negative pulse electrical signals, which drive the control lever assembly to swing in the forward and reverse directions. Then, the control lever of the control lever assembly drives the push plate to slide up and down along the slide groove inside the cover. When the push plate slides upward into place, the moving contact of the moving contact assembly abuts against the stationary contact of the stationary plate of the cover. When they abut against each other, the moving contact support of the moving contact assembly compresses the spring to form a holding force. When the push plate slides downward into place, the moving contact disengages from the stationary contact, that is, the magnetic latching relay is disconnected. When the push plate is in place, the V-shaped spring is compressed, and the V-shaped spring provides an initial force for the push plate to slide upward.

[0011] This invention employs a sliding contact with telescopic cooperation directly set at the end of the push plate, and a spring is set inside the sliding contact as an elastic support. The sliding contact and the stationary contact are in linear contact, which is more sensitive and reliable. At the same time, the sliding contact is not easy to deviate or dislodge relative to the push plate, which makes the operation more reliable and the service life longer. It is suitable for use as an electromagnetic relay or an improvement on the structure of similar relays. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0013] Figure 2 This is a partial exploded structural diagram of the present invention.

[0014] Figure 3 This is a three-dimensional structural diagram of the push plate and moving contact assembly of the present invention.

[0015] Figure 4 This is a schematic diagram of the assembly structure of the push plate and moving contact assembly of the present invention.

[0016] The numbers and names in the diagram are as follows: 1. Cover, 101. Slide groove, 102. Stroke opening, 2. Stationary plate, 3. Lead-out plate, 4. Stationary contact, 5. Moving contact, 6. Flexible wire, 7. Electromagnetic coil assembly, 8. Control lever assembly, 801. Control lever, 9. Push plate, 901. Notch, 902. Manual lever, 903. Guide rib, 904. Limiting block, 905. Top groove, 906. Side groove, 10. V-shaped spring, 11. Moving contact support, 1101. Top plate, 1102. Side plate, 1103. First protrusion, 1104. Second protrusion, 1105. Stroke notch, 1106. Limiting notch, 12. Spring. Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] like Figures 1-4 As shown, the magnetic latching relay includes a housing 1, a stationary plate 2, a lead plate 3, an electromagnetic coil assembly 7, a lever assembly 8, a push plate 9, and a moving contact assembly. The electromagnetic coil assembly is fixed inside the housing and includes a coil support, an iron core, a coil, and a yoke. Specifically, the iron core is located in the middle of the coil support, and the coil is wound around it. Bent yokes are provided at both ends of the coil support. The lever assembly includes a housing, a permanent magnet placed inside the housing, and double-headed yokes on both sides of the housing that conduct magnetism with the permanent magnet. The lever assembly forms a magnetic attraction with the yokes at both ends of the electromagnetic coil assembly through the double-headed yokes on both sides. A lever 801 is provided on one side of the housing, and the housing is rotatably positioned relative to the housing. When the electromagnetic coil assembly is energized to generate positive and negative electrical signals, it drives the lever assembly to reciprocate relative to the housing. The push plate has a notch 901 on one side that is linked to the lever. The push plate slides within a groove 101 on one side of the housing, and its directional reciprocating motion relative to the groove is driven by the swinging of the lever assembly's lever. One end of the push plate is connected to the moving contact assembly, and the cover is fixedly connected to the stationary plate and the lead-out plate. The stationary plate is fixedly provided with a stationary contact 4, and the stationary contact is arranged opposite to the moving contact 5 of the moving contact assembly.

[0019] The main design of this magnetic latching relay is as follows: a moving contact assembly with a telescopic fit is connected to the end of the push plate 9. The moving contact assembly includes a moving contact 5, a moving contact support 11, and a spring 12. The moving contact is fixed to the moving contact support, and the moving contact support has a telescopic fit relative to the end of the push plate, with the direction of the telescopic fit being consistent with the sliding direction of the corresponding slide groove 101 of the push plate. A spring is provided between the moving contact support and the push plate to tension both their telescopic states. That is, when the moving contact is not in contact with the stationary contact 4, the moving contact support is in an extended position relative to the end of the push plate under the action of the spring; when the push plate slides until the moving contact is in contact with the stationary contact of the housing, the moving contact support is in a retracted position relative to the end of the push plate. The moving contact support is made of metal and is connected to the lead-out piece 3 of the housing through a flexible wire 6. The aforementioned moving contact support is a metal plate bent at a right angle. One right-angled plate on one side of the metal plate is a top plate 1101, and the moving contact is fixedly connected to the surface of the top plate. Limiting recesses 1106 are formed on both sides of the top plate. The other right-angled plate on the metal plate is a side plate 1102. The surface of the side plate is provided with a travel recess 1105, and a first protrusion 1103 is provided on the outer side of the side plate near the right-angle bend, and a second protrusion 1104 is provided near the end of the plate. The first and second protrusions are perpendicular to the side plate and protrude at the same height. The push plate has a right-angled groove at its end to accommodate the sliding and telescopic movement of a metal plate. The top groove 905 of the right-angled groove corresponds to the top plate of the metal plate, and the side groove 906 corresponds to the side plate of the metal plate. A guide rib 903 on one side of the top groove forms a guiding sliding fit with the limiting recesses on both sides of the top plate. The direction of this guiding sliding fit is the direction in which the metal plate slides and telescopically relative to the right-angled groove. A spring, as described above, is installed inside the top groove to press against the top plate of the metal plate. A limiting block 904 in the side groove engages with the travel recess of the side plate of the metal plate and restricts the metal plate from dislodging from the right-angled groove along the telescopic direction. When the push plate slides into the corresponding groove, the first and second protrusions of the side plate of the metal plate abut against the side wall of the groove, further preventing the metal plate from dislodging from the right-angled groove and ensuring reliable telescopic movement of the metal plate at the end of the push plate, preventing misalignment.

[0020] The slide groove 101 of the cover 1 is provided with a V-shaped spring piece 10 corresponding to the other end of the push plate. When the push plate slides to the point where the moving contact 5 and the stationary contact 4 are disconnected, the push plate compresses the V-shaped spring piece. At this time, the force exerted by the V-shaped spring piece on the push plate is the same as the force exerted by the spring 12 when the moving contact and the stationary contact are in contact. One side of the V-shaped spring piece is locked to the bottom of the slide groove of the cover, which is relatively stable and firm.

[0021] Furthermore, the side of the aforementioned push plate 9 is provided with a manual lever 902 that drives the push plate to slide manually into position, and the side of the cover is provided with a travel opening 102 adapted to the operation of the manual lever. When the electrical control fails, the relay can be switched on and off manually.

[0022] The working principle of this electromagnetic relay is as follows: By applying positive and negative pulse electrical signals to the electromagnetic coil assembly 7, the control lever assembly 8 is driven to rotate in the forward and reverse directions. The control lever 801 of the control lever assembly then drives the push plate 9 to slide up and down along the slide groove 101 inside the housing 1. When the push plate slides upward to its designated position, the moving contact 5 of the moving contact assembly comes into close contact with the stationary contact 4 of the stationary plate 2 of the housing. During this close contact, the moving contact support of the moving contact assembly compresses the spring 12 to create a holding force. This holding force helps reduce the kinetic energy requirement when the push plate slides in the reverse direction, thereby reducing the power consumption of the electromagnetic coil assembly. When the push plate slides downward to its designated position, the moving contact disconnects from the stationary contact, i.e., the magnetic latching relay is disconnected. When the push plate reaches its designated position, it compresses the V-shaped spring 10. The V-shaped spring provides an initial force for the push plate to slide upward, which also reduces the kinetic energy requirement of the push plate, thereby reducing the power consumption of the electromagnetic coil assembly. This completes the on / off operation of the magnetic latching relay.

[0023] The above description is intended to illustrate the technical means of the present invention and is not intended to limit the scope of the invention. Any obvious improvements or substitutions made to the present invention by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A magnetic latching relay, comprising a housing (1), an electromagnetic coil assembly (7) fixed inside the housing, a control lever assembly (8) that rotates relative to the housing in a limited manner according to the change of the magnetic poles of the electromagnetic coil assembly, a push plate (9) that slides in a direction relative to a corresponding slide groove (101) inside the housing in linkage with the control lever assembly (801), one end of the push plate being connected to a moving contact assembly, a stationary plate (2) and a lead-out plate (3) being fixedly connected to the housing, the stationary plate being fixedly provided with a stationary contact (4), the stationary contact being disposed opposite to the moving contact (5) of the moving contact assembly; characterized in that The moving contact assembly includes a moving contact (5), a moving contact support (11), and a spring (12). The moving contact is fixed to the moving contact support. The moving contact support is in a telescopic engagement with the end of the push plate, and the direction of the telescopic engagement is consistent with the sliding direction of the push plate corresponding to the slide groove (101). A spring is provided between the moving contact support and the push plate to tension both of their telescopic states. That is, when the moving contact is not in contact with the stationary contact (4), the moving contact support is in a fully extended position relative to the end of the push plate under the action of the spring. When the push plate slides to the point where the moving contact contacts the stationary contact of the housing, the moving contact support is in a retracted state relative to the end of the push plate. The moving contact support is made of metal and is connected to the lead-out piece (3) of the housing (1) via a flexible wire (6). The moving contact support is a metal plate bent at a right angle. One right-angle plate of the metal plate is the top plate (1101), and the moving contact is fixedly connected to the surface of the top plate. Limiting recesses (1106) are formed on both sides of the top plate. The other right-angle plate of the metal plate is the side plate (1102). The side plate has a travel notch (1105) on its surface, and a first protrusion (1103) is provided on the outer side of the side plate near the right-angle bend, and a second protrusion (1104) is provided near the end of the plate. The first and second protrusions are perpendicular to the side plate and of equal height. The end of the push plate has a right-angle groove adapted to the sliding extension and retraction of the metal plate. The top groove (905) of the right-angle groove corresponds to the top plate of the metal plate, and the side groove (906) corresponds to the side plate of the metal plate. One side of the top groove has two grooves that correspond to the top plate. The limiting notch on the side forms a guide rib (903) for guiding sliding engagement. The direction of this guiding sliding engagement is the direction in which the metal plate slides and extends relative to the right-angle groove. The top groove is provided with a spring that abuts against the top plate of the metal plate. The side groove is provided with a limiting block (904) that engages with the travel notch of the side plate of the metal plate and restricts the metal plate from dislodging from the right-angle groove in the extension direction. When the push plate is slidably placed in the corresponding slide groove, the first protrusion and the second protrusion of the side plate of the metal plate abut against the side wall of the slide groove for limiting.

2. The magnetic latching relay according to claim 1, characterized in that... The cover (1) has a V-shaped spring piece (10) in the groove (101) corresponding to the other end of the push plate (9). When the push plate slides to the point where the moving contact (5) and the stationary contact (4) are disconnected, the push plate compresses the V-shaped spring piece. At this time, the force exerted by the V-shaped spring piece on the push plate is the same as the force exerted by the spring (12) when the moving contact and the stationary contact are in contact.

3. The magnetic latching relay according to claim 2, characterized in that... One side of the V-shaped spring (10) is locked in place with the bottom of the groove (101) of the cover (1).

4. The magnetic latching relay according to claim 1, characterized in that... The side of the push plate (9) is provided with a manual lever (902) that drives the push plate to slide manually into position, and the side of the cover (1) is provided with a stroke opening (102) adapted to the operation of the manual lever.

5. The magnetic latching relay according to claim 1, characterized in that... The electromagnetic coil assembly (7) includes a coil support, an iron core, a coil, and a yoke. The iron core is located in the middle of the coil support, and the coil is wound around it. Both ends of the coil support are provided with bent yokes. The control lever assembly (8) includes a housing, a permanent magnet placed inside the housing, and double-headed yokes that conduct magnetism with the permanent magnet on both sides of the housing. The control lever assembly forms a magnetic attraction with the yokes at both ends of the electromagnetic coil assembly through the double-headed yokes on both sides. One side of the housing is provided with a control lever (801), and one side of the push plate (9) is provided with a notch (901) that forms a linkage with the control lever.

6. The magnetic latching relay according to claim 2, characterized in that... The electromagnetic coil assembly (7) is subjected to positive and negative pulse electrical signals, which drive the control lever assembly (8) to swing in the forward and reverse directions. Then, the control lever (801) of the control lever assembly drives the push plate (9) to slide up and down along the slide groove in the cover. When the push plate slides up to the position, the moving contact (5) of the moving contact assembly is in close contact with the stationary contact (4) of the stationary plate (2) of the cover (1). When in close contact, the moving contact support (11) of the moving contact assembly compresses the spring (12) to form a holding force. When the push plate slides down to the position, the moving contact is disconnected from the stationary contact, that is, the magnetic latching relay is disconnected. When the push plate is in the position, the V-shaped spring (10) is compressed. The V-shaped spring provides an initial force for the push plate to slide up.

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