Space-saving three-phase magnetic latching relay

Abstract

The utility model belongs to the technical field of relays, and particularly relates to a space-saving three-phase magnetic latching relay, which comprises a shell formed by buckling and assembling a bottom shell and an upper cover, a contact assembly fixedly assembled in the shell, an armature assembly rotatably arranged in the shell and an electromagnetic coil assembly used for enabling the armature assembly to perform compound pendulum to realize on-off of a circuit, the moving plate assembly comprises a moving plate, the other end of the moving plate is fixedly connected with a reed, the reed is fixedly provided with a moving contact, the static plate assembly comprises a static plate, the static plate is fixedly provided with a static contact opposite to the moving contact, the moving plate comprises an incoming end, a bending part and a connecting part, the bending part protrudes out of the shell, the connecting part is located at the position opposite to the moving contact, and the incoming end is connected with the incoming end. Through the design that the movable sheet is integrated with the bending part, a metering function can be realized, the space occupation amount of the magnetic latching relay is reduced, meanwhile, the assembling workload of equipment is reduced, and through the design matching of the connecting part and the reed, the movable contact can be tightly and reliably contacted with the static contact to prevent disconnection.

Description

Technical Field

[0001] The utility model belongs to the technical field of relays, in particular to a space-saving three-phase magnetic latching relay. Background Art

[0002] A latching relay is a special type of electromagnetic relay that does not require a continuous current to maintain the contact state after the contact state is changed. Instead, it relies on an internal permanent magnet to keep the contacts open or closed. This type of relay is very useful in situations where low power consumption and high reliability are required.

[0003] The existing magnetic latching relay is mainly composed of an electromagnetic system, a permanent magnet, a contact system, a driving mechanism and a shell. The working principle is: the coil passes a pulse current to generate a magnetic field that interacts with the magnetic field of the permanent magnet, changing the contact state. After the state changes, it is maintained by the magnetic force of the permanent magnet. To change the state again, a reverse pulse current must be applied.

[0004] The magnetic latching relay in the existing technology currently has the following disadvantages: when the equipment needs to be measured by the magnetic latching relay, an additional conductive plate for measurement needs to be welded to its external contacts, which increases the space occupied by the magnetic latching relay and the assembly workload of the equipment. Therefore, to address the above problems, a space-saving three-phase magnetic latching relay is proposed. Utility Model Content

[0005] In order to make up for the shortcomings of existing magnetic latching relays, a space-saving three-phase magnetic latching relay is proposed to solve the problem that when the equipment uses the magnetic latching relay for metering, an additional conductive plate needs to be welded to its external contacts for metering, which increases the space occupied by the magnetic latching relay and increases the assembly workload of the equipment.

[0006] The technical solution adopted by the utility model to solve its technical problems is: the space-saving three-phase magnetic latching relay described in the utility model includes a shell assembled by buckling a bottom shell and an upper cover, a contact assembly fixedly assembled in the shell, the contact assembly including a moving piece assembly and a static piece assembly, an armature assembly and an electromagnetic coil assembly for making the armature assembly swing repeatedly to realize circuit switching, the moving piece assembly including a moving piece, one end of the moving piece extends out of the shell, the other end of the moving piece is fixedly connected to a spring, a moving contact is fixedly provided on the spring, the static piece assembly includes a static piece, a static contact opposite to the moving contact is fixedly provided on the static piece, a linkage plate is movably provided in the shell, the linkage plate is used to link the armature assembly and the spring, the moving piece includes an access end, a bending portion, and a connecting portion, the bending portion protrudes to the outside of the shell, and the connecting portion is located opposite to the moving contact.

[0007] Preferably, a heat dissipation channel is provided on the housing, and a through hole for dissipating heat of the static contacts is provided in the heat dissipation channel.

[0008] Preferably, reinforcing ribs are fixedly provided in the heat dissipation channel.

[0009] Preferably, a shielding cover is provided on the shell at the position of the electromagnetic coil assembly.

[0010] Beneficial effects of the utility model:

[0011] 1. The metering function can be realized by connecting the input end of the metering device to the bent part through a wire. There is no need to weld an additional conductive plate for metering at its external contact, which reduces the space occupied by the magnetic latching relay and the assembly workload of the equipment.

[0012] 2. Through the design coordination of the connection part and the reed, the magnetic fields generated by the current flowing through them are in opposite directions in adjacent areas. According to the basic properties of the magnetic field, opposite poles attract each other and like poles repel each other, which causes the connection part and the reed to repel each other and move away from each other, providing a thrust to the reed, so that the moving contact on the reed can be in close and reliable contact with the static contact to prevent disconnection, thereby ensuring the normal use of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 It is a cross-sectional view of the internal structure of the utility model;

[0015] Figure 2 It is a structural stereogram of the entire utility model;

[0016] Figure 3 It is a structural stereogram of the contact assembly;

[0017] Figure 4 It is a cross-sectional view of the heat dissipation channel location;

[0018] Legend:

[0019] 1. Shell; 01. Bottom shell; 02. Upper cover; 2. Contact assembly; 201. Moving piece assembly; 2011. Moving piece; 20111. Access end; 20112. Bending portion; 20113. Connecting portion; 2012. Reed; 20121. Moving contact; 202. Static piece assembly; 2021. Static piece; 20211. Static contact; 3. Electromagnetic coil assembly; 4. Armature assembly; 5. Linkage plate; 6. Heat dissipation channel; 601. Through hole; 602. Reinforcement rib; 7. Shielding cover; 8. Fixing hole. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Specific examples are given below.

[0022] See also Figure 1-Figure 4The utility model discloses a space-saving three-phase magnetic latching relay, comprising a housing 1 assembled by a bottom shell 01 and an upper cover 02, wherein a contact assembly 2 is fixedly mounted in the housing 1, and the contact assembly 2 comprises a movable plate assembly 201 and a static plate assembly 202, and an armature assembly 4 and an electromagnetic coil assembly 3 for causing the armature assembly 4 to swing repeatedly to realize circuit switching, the movable plate assembly 201 comprises a movable plate 2011, and a portion of the movable plate 2011 is fixedly mounted in the housing 1. The end extends out of the housing 1, the other end of the movable piece 2011 is fixedly connected to the spring 2012, the spring 2012 is fixedly provided with a moving contact 20121, the static piece assembly 202 includes a static piece 2021, the static piece 2021 is fixedly provided with a static contact 20211 opposite to the moving contact 20121, and a linkage plate 5 is movably provided in the housing 1, the linkage plate 5 is used to link the armature assembly 4 and the spring 2012, the movable piece 2011 includes a fixed spring 2012, and the static piece assembly 202 includes a fixed spring 2021. The electromagnetic coil assembly 3 generates a magnetic field, which attracts or repels the armature assembly 4, causing it to rotate. The rotation of the armature assembly 4 is transmitted to the spring 2012 through the linkage plate 5, causing the moving contact 20121 to come into contact with or separate from the static contact 20211, thereby realizing the on-off of the contacts. When the magnetic latching relay is connected to the metering equipment, since the moving plate assembly 201 is integrated with the bent portion 20112, and the bent portion 20112 protrudes from the outside of the housing 1, the metering function can be realized by connecting the input end of the metering equipment to the bent portion 20112 through a wire, without welding an additional conductive plate for metering on its external contact, thereby reducing the space occupied by the magnetic latching relay and reducing the assembly workload of the equipment.When the magnetic latching relay is energized, the current flows through the access terminal 20111 to the connecting portion 20113 and then to the bent portion 20112, and then to the reed 2012, and then the current is transferred to the static contact 20211 through the moving contact 20121, and the static contact 2021 is energized. When the moving contact 20121 and the static contact 20211 are in contact with each other by a large current, a certain repulsive force will be generated between the two, which will affect the contact reliability of the moving contact 20121 and the static contact 20211. However, in the present invention, since the connecting portion 20113 is located at the opposite position of the moving contact 20121 on the reed 2012, the current flowing through the connecting portion 20113 is opposite to the current flowing into the reed 2012, and the reed 2012 provides a Lorentz force, generating a magnetic field around it when current passes through it. Since the currents in connection portion 20113 and reed 2012 flow in opposite directions, the magnetic fields they generate in adjacent areas are in opposite directions. According to the fundamental properties of magnetic fields, opposite poles attract, and like poles repel. Therefore, the magnetic fields of adjacent portions of the current flowing through connection portion 20113 and reed 2012 repel each other, causing connection portion 20113 and reed 2012 to repel each other and move away from each other. This provides a thrust on reed 2012, ensuring that the moving contact 20121 on reed 2012 maintains close and reliable contact with the static contact 20211, preventing disconnection and ensuring the normal operation of the circuit breaker.

[0023] Furthermore, a heat dissipation channel 6 is provided on the shell 1, and a through hole 601 is provided in the heat dissipation channel 6 for dissipating heat from the static contact 20211. During operation, the magnetic latching circuit breaker will generate heat, especially where the heat is more concentrated at the contact position. Excessive heat greatly affects the service life. The utility model designs a heat dissipation channel 6 near the contact to reduce the internal temperature of the circuit breaker. The heat generated by the static contact 20211 is carried out by the air flowing in the heat dissipation channel 6 through the through hole 601, which greatly reduces the temperature rise of the circuit breaker and improves the service life.

[0024] Furthermore, a reinforcing rib 602 is fixedly provided in the heat dissipation channel 6 , and the cooperation of the reinforcing rib 602 in the heat dissipation channel 6 ensures the reliability of the overall structure.

[0025] Furthermore, a shielding cover 7 is provided on the housing 1 at the position of the electromagnetic coil assembly 3. During operation, the shielding cover 7 cooperates to isolate the external magnetic field to prevent the electromagnetic coil assembly 3 from being affected, thereby ensuring the normal use of the circuit breaker.

[0026] Furthermore, a dual-magnetic-head trigger auxiliary switch for detecting contact status is assembled in the housing 1 .

[0027] Furthermore, the housing 1 is provided with a fixing hole 8 for assembling and fixing the relay.

[0028] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A space-saving three-phase magnetic latching relay, comprising a housing (1) assembled by fastening a bottom housing (01) and an upper cover (02), a contact assembly (2) fixedly mounted in the housing (1), the contact assembly (2) comprising a moving plate assembly (201) and a stationary plate assembly (202), an armature assembly (4) and an electromagnetic coil assembly (3) for causing the armature assembly (4) to swing repeatedly to realize circuit switching, rotatably arranged in the housing (1), characterized in that: The movable plate assembly (201) comprises a movable plate (2011), one end of the movable plate (2011) extends outside the housing (1), the other end of the movable plate (2011) is fixedly connected to a reed plate (2012), a movable contact (20121) is fixedly provided on the reed plate (2012), and the static plate assembly (202) comprises a static plate (2021), a static contact (2021) is fixedly provided on the static plate (2021) and is opposite to the movable contact (20121). A linkage plate (5) is movably provided in the housing (1), the linkage plate (5) being used to link the armature assembly (4) and the spring (2012), the movable plate (2011) comprising an access end (20111), a bent portion (20112), and a connecting portion (20113), the bent portion (20112) protruding from the outside of the housing (1), and the connecting portion (20113) being located opposite the movable contact point (20121).

2. The space-saving three-phase magnetic latching relay according to claim 1, characterized in that: A heat dissipation channel (6) is provided on the housing (1), and a through hole (601) for dissipating heat from the static contact (20211) is provided in the heat dissipation channel (6).

3. The space-saving three-phase magnetic latching relay according to claim 2, characterized in that: A reinforcing rib (602) is fixedly provided in the heat dissipation channel (6).

4. The space-saving three-phase magnetic latching relay according to claim 1, characterized in that: A shielding cover (7) is provided on the housing (1) at the position of the electromagnetic coil assembly (3).

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