CN212277105U

CN212277105U - Relay load end wiring mechanism

Info

Publication number: CN212277105U
Application number: CN202021210966.5U
Authority: CN
Inventors: 李温顺; 何连辉
Original assignee: Zettler Electronics Xiamen Co ltd
Current assignee: Zettler Electronics Xiamen Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-01
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a relay load end wiring mechanism, which comprises a movable end component and a fixed end component, wherein the movable end component mainly comprises a movable terminal and a movable reed fixed on the movable terminal, the movable reed is an elastic conductive metal sheet, the front end of the movable reed is fixedly connected with the front end of the movable terminal and extends backwards along the lower part of the movable terminal, and the rear end of the movable reed is close to the rear end of the movable terminal and is provided with at least one movable contact; the static end assembly mainly comprises a static end connecting plate, a static contact corresponding to the moving contact is arranged on the static end connecting plate, a static end main terminal and a static end auxiliary terminal are respectively arranged on the static end connecting plate, and the static end main terminal and the static end auxiliary terminal are respectively connected with the same load. The relay load end wiring mechanism can utilize the flat cable to generate electromagnetic attraction to the movable end when large current impacts, increase the closing force of the contact of the movable end and prevent the separation failure of repulsion between the contacts due to the current contraction effect of the contacts under the large current.

Description

Relay load end wiring mechanism

Technical Field

The utility model relates to an electromagnetic relay, in particular to relay load end termination mechanism.

Background

Because the relay has unique electrical and physical characteristics in the control circuit, high insulation resistance in an off state and low on resistance in an on state, any other electronic components cannot be compared with the relay, and the relay has the advantages of high standardization degree, good universality, capability of simplifying circuits and the like, so the relay is widely applied to various electronic equipment in aerospace, military electronic equipment, information industry and national economy.

When the relay is in use, the conditions of high current impact such as short circuit, capacitance impact, motor stalling and the like can occur; under the impact of large current, the current can generate a contraction effect at the contact position of the contact, and a considerable repulsion force is generated on the movable contact, so that the contacts are separated, and high-temperature arc failure is generated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a relay load end termination mechanism.

According to one aspect of the utility model, a relay load end wiring mechanism is provided, which comprises a movable end component and a static end component, wherein the movable end component is connected with an electromagnetic component of a relay and is driven by the electromagnetic component to move towards the static end component;

the movable end assembly mainly comprises a movable terminal and a movable reed fixed on the movable terminal, the movable reed is an elastic conductive metal sheet, the front end of the movable reed is fixedly connected with the front end of the movable terminal and extends backwards along the lower part of the movable terminal, and the rear end of the movable reed is close to the rear end of the movable terminal and is provided with at least one movable contact;

the static end assembly mainly comprises a static end connecting plate, a static contact corresponding to the moving contact is arranged on the static end connecting plate, the moving contact is separated from the static contact under the elastic action of a moving reed, a static end main terminal and a static end auxiliary terminal are respectively arranged on the static end connecting plate, and the static end main terminal and the static end auxiliary terminal are respectively connected with the same load.

Further, the arrangement direction of the static end main terminals is the same as that of the movable spring pieces, and the arrangement direction of the static end auxiliary terminals is intersected with that of the static end main terminals.

Specifically, the junction of the stationary-end main terminal and the stationary-end connecting plate is closer to the stationary contact than the stationary-end auxiliary terminal. Depending on the characteristics of the current, the main dead end terminal serves as the primary exit for the load current, while the secondary dead end terminal generally does not serve to exit the load current.

Preferably, the fixed end main terminal and the fixed end auxiliary terminal are in the same plane, and the plane of the fixed end main terminal and the plane of the fixed end auxiliary terminal is perpendicular to the contact direction between the movable contact and the fixed contact.

Further, the static end auxiliary terminal is arranged on the left side of the static end main terminal.

Preferably, the dead end main terminal is an electronic wire, a copper plate or a PCB board.

Preferably, the dead end sub-terminal is an electronic wire, a copper plate or a PCB board.

By adopting the relay load end wiring mechanism of the technical scheme, the electromagnetic attraction force can be generated on the movable end by utilizing the flat cable when the large current impacts, the closing force of the contact of the movable end is increased, and the separation failure of the repulsion force between the contacts due to the current contraction effect of the contact under the large current is prevented.

Drawings

Fig. 1 is a schematic structural diagram of a relay load terminal connection mechanism according to an embodiment of the present invention.

Fig. 2 is a schematic side view of the load termination mechanism of the relay shown in fig. 1.

Fig. 3 is an assembled schematic view of the dead end main terminal and the dead end sub-terminal of the relay load termination mechanism of fig. 1.

Fig. 4 is a schematic bottom view of the load termination mechanism of the relay of fig. 1.

Fig. 5 is a schematic diagram of the short circuit current of the load termination mechanism of the relay of fig. 1.

Fig. 6 is a sectional view taken along the line a-a in fig. 5.

Fig. 7 is a schematic structural diagram of a relay load terminal connection mechanism according to another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a relay load terminal connection mechanism according to another embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a relay load terminal connection mechanism according to another embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 to 4 schematically show a relay load end wiring mechanism according to an embodiment of the present invention.

As shown, the device comprises a moving end assembly 1 and a stationary end assembly 2. The moving end component 1 is connected with an electromagnetic component of the relay and is driven by the electromagnetic component to move towards the static end component 2.

The movable end assembly 1 mainly comprises a movable terminal 12 and a movable spring 11 fixed on the movable terminal 12.

The movable spring plate 11 is an elastic conductive metal sheet.

The front end of the movable spring piece 11 is fixedly connected with the front end of the movable terminal 12 and extends backwards along the lower part of the movable terminal 12, and the rear end of the movable spring piece 11 is close to the rear end of the movable terminal and is provided with at least one movable contact 13.

The movable end assembly 1 thus constitutes a U-shaped structure.

The dead end assembly 2 basically includes a dead end connection plate 21.

The fixed end connecting plate 21 is provided with a fixed contact 22 corresponding to the movable contact 13.

The elastic action of movable spring 11 separates movable contact 13 from stationary contact 22.

The static end connecting plate 21 is provided with a static end main terminal 23 and a static end auxiliary terminal 24 respectively.

The stationary-side main terminal 23 and the stationary-side auxiliary terminal 24 are connected to the same load, respectively.

As shown in the figure, the arrangement direction of the fixed end main terminals 23 is the same as that of the movable spring 11, and the arrangement direction of the fixed end sub-terminals 24 intersects with that of the fixed end main terminals 23.

The junction of the stationary-end main terminal 23 and the stationary-end connecting plate 21 is closer to the stationary contact 22 than the stationary-end auxiliary terminal 24.

Depending on the characteristics of the current, the dead end main terminal 23 serves as the main lead for the load current, while the dead end sub-terminal 24 generally does not function to lead the load current.

The fixed end main terminal 23 and the fixed end auxiliary terminal 24 are in the same plane, and the plane of the fixed end main terminal and the fixed end auxiliary terminal is perpendicular to the contact direction between the movable contact 13 and the fixed contact 22.

Further, the stationary-end auxiliary terminal 24 is provided on the left side of the stationary-end main terminal 23.

Firstly, principle explanation:

as shown in fig. 5 and fig. 6, if a large current surge condition such as short circuit, capacitance surge, and motor stalling occurs during the use of the relay, and the current flowing direction I is from the right to the left of the fixed terminal pair 24 in fig. 4, the current flowing direction of the movable spring piece 11 is from the right to the left, then the following can be inferred:

1. according to the right hand rule, the direction of the magnetic field generated by the current in the dead end sub-terminal 24 is counterclockwise as seen in fig. 5.

2. According to the left-hand rule, the magnetic force generated by the static terminal auxiliary terminal 24 current on the movable spring piece 11 is downward, so that the force in the closing direction of the movable contact 13 and the static contact 22 is strengthened.

3. Similarly, the plurality of movable contacts 13 are downward in the magnetic force direction of the magnetic field, and the force in the contact closing direction is also strengthened.

When the current direction is from the left side to the right side of the fixed terminal 24 in fig. 4, it can be seen that the direction of the magnetic force generated by the current of the fixed terminal 24 on both the movable contact spring 11 and the movable contact 13 is downward according to the above principle.

Second, simulation analysis

Fig. 6, 7 and 8 show some other connection modes of the fixed terminal auxiliary terminal 24 and the fixed terminal main terminal 23, respectively.

Wherein the static end auxiliary terminal 24 and the static end main terminal 23 are parallel to each other in fig. 6 and 7; the stationary-end sub-terminal 24 is located on the right side of the stationary-end main terminal 23 in fig. 8.

Figure 2 (structure of the invention) using finite element analysis software for analysis at high current of 1.5kA inrush current,

The simulation calculation results of the contact repulsive force moments in fig. 6 and 8 are as follows:

table 1 simulation calculation table of contact repulsion force moment

Wiring mode	Repulsion moment of movable contact in 1.5kA large current impact
		FIG. 2	4.5mN*m
FIG. 7	5.78mN*m
		FIG. 8	5.78mN*m
FIG. 9	5.96mN*m

According to the analysis of simulation calculation results, the connection modes in fig. 6, 7 and 8 do not improve the closing force of the contact under the high-current impact, and the connection mode (fig. 2) provided in the embodiment has obvious improvement on the closing force of the contact under the high-current impact.

Third, actual short circuit test

The results of the tests according to IEC62752-2016, conditions 1.5kA, 6kA2s are as follows:

TABLE 2 actual short-circuiting chart

Wiring mode	Number of trials	Qualified quantity	Failure mode
				FIG. 2	10	10	Is free of
FIG. 7	10	6	Contact burning and adhesion
				FIG. 8	10	6	Contact burning and adhesion
FIG. 9	10	4	Contact burning and adhesion

As can be seen from the above table, the connection method (fig. 2) provided in fig. 6 and this embodiment has a very significant effect on resisting short-circuit large current surge.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. A relay load end wiring mechanism is characterized by comprising a movable end assembly and a fixed end assembly, wherein the movable end assembly is connected with an electromagnetic assembly of a relay and driven by the electromagnetic assembly to move towards the fixed end assembly;

the movable end assembly mainly comprises a movable terminal and a movable reed fixed on the movable terminal, the movable reed is an elastic conductive metal sheet, the front end of the movable reed is fixedly connected with the front end of the movable terminal and extends backwards along the lower direction of the movable terminal, and the rear end of the movable reed is close to the rear end of the movable terminal and is provided with at least one movable contact;

the static end assembly mainly comprises a static end connecting plate, a static contact corresponding to the movable contact is arranged on the static end connecting plate, the movable contact is separated from the static contact under the elastic action of the movable spring, a static end main terminal and a static end auxiliary terminal are respectively arranged on the static end connecting plate, and the static end main terminal and the static end auxiliary terminal are respectively connected with the same load.

2. The relay load termination wiring mechanism according to claim 1, wherein the arrangement direction of the stationary main terminals is the same as the movable spring, and the arrangement direction of the stationary auxiliary terminals intersects with the arrangement direction of the stationary main terminals.

3. The relay load termination mechanism of claim 2, wherein the junction of the stationary terminal main terminal and the stationary terminal connection plate is closer to the stationary contact than the stationary terminal auxiliary terminal.

4. The relay load termination mechanism according to claim 2 or 3, wherein the stationary main terminal and the stationary auxiliary terminal are in the same plane, and the plane of the stationary main terminal and the plane of the stationary auxiliary terminal is perpendicular to the direction of contact between the movable contact and the stationary contact.

5. The relay load termination wiring mechanism of claim 4, wherein the dead end secondary terminal is located to the left of the dead end primary terminal.

6. The relay load termination wiring mechanism of claim 1, wherein the dead end main terminal is an electrical wire, a copper plate, or a PCB board.

7. The relay load termination wiring mechanism of claim 1, wherein the dead end secondary terminal is an electrical wire, a copper plate, or a PCB board.