CN207381328U - A protective relay - Google Patents

Abstract

The utility model relates to the technical field of relays, in particular to a protective relay, which is provided with protective resistors on two power supply terminals, the utility model can effectively prevent the damage of the relay due to long-term power-on state and the burning-out of the relay due to excessive current, and the utility model also discloses a magnetic force attraction armature is generated after the coil component is powered on by arranging two static contacts on the base, the armature pushes the movable reed, so that the movable reed is communicated with one of the static contact terminals, after the power is cut off, the movable spring leaf is restored under the action of the self elasticity, so that the movable spring leaf is communicated with the static contact terminal, the armature and the self elasticity of the movable spring leaf are controlled by the on-off of the coil component, the magnetic force action and the mechanical elastic force action are combined, the on-off of the bidirectional switch can be controlled by one movable contact, and the size of the whole relay is effectively reduced.

Description

A protective relay

technical field

The utility model relates to the technical field of relays, in particular to a protective relay.

Background technique

The relay is an electric control device, which is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the change of the input quantity (excitation quantity) meets the specified requirements. It has an interactive relationship between the control system (also known as the input loop) and the controlled system (also known as the output loop). Usually used in automatic control circuits, it is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

With the development of low-voltage electrical appliances, the application of relays is becoming more and more extensive, and the requirements for relays are getting higher and higher. However, if the current relays are in the energized state for a long time, it is easy to damage the relays, and if the relays have excessive current when they are working, It is easy to cause the relay to burn out, and the existing relay has a large volume, which is difficult to meet the development of some miniaturized equipment.

Utility model content

The utility model provides a protective relay for the problems of the prior art. A protective resistor is added to the power supply terminal of the traditional relay, which can effectively prevent the relay from being damaged due to long-term energized state and the relay from being burned out due to excessive current. Moreover, the utility model has a compact structure and can meet the needs of most miniaturized electric appliances.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A protective relay provided by the utility model includes a base, a coil assembly, a yoke, an armature, a moving reed, a protection resistor, a static contact part and two power supply terminals, and the static contact part includes two static contact terminals , one end of the static contact part is set on the base, one end of the yoke is connected to the base, the other end of the yoke is connected to one end of the moving reed, and the armature is installed At the other end of the moving reed, the coil assembly is installed on the yoke, and the coil assembly attracts the armature under the action of a magnetic force to drive the moving reed to move. The moving reed is used to conduct two static contacts One of the terminals, the two power supply terminals are electrically connected to the coil assembly, and the two ends of the protection resistor are respectively connected to the two power supply terminals.

Preferably, the base is provided with an installation slot for accommodating the protection resistor.

Preferably, the coil assembly includes a bracket, a fixed iron core and a coil, the bracket is fixed on the base, the fixed iron core is fixed on the bracket, the coil is sleeved on the outside of the bracket, and the coil surrounds the iron core One end of the yoke is in contact with one end of the fixed iron core, and the other end of the fixed iron core is used to attract the armature.

Preferably, the movable reed includes a movable conflicting part and a movable contact arranged on the movable conflicting part, the armature is arranged on the movable conflicting part, and the movable conflicting part is arranged on the lower end of the movable spring.

Preferably, the moving reed is provided with a bent portion, and the bent portion is provided with an installation hole.

Preferably, the armature is provided with several protrusions for installing the moving reed.

Preferably, the two static contact parts further include two output terminals, and the two output terminals are respectively connected to the two static contact terminals.

Preferably, one ends of the two output terminals are fixed on the base, and the other ends of the two output terminals extend to the outside of the base.

Preferably, a side of the armature on which the moving reed is installed is provided with a bevel for relief.

Preferably, the protective relay further includes a case covering the outside of the base, and the base is provided with a side slot for accommodating the case.

The beneficial effects of the utility model:

The protective relay is equipped with protective resistors on the two power supply terminals, which can effectively prevent the damage of the relay due to the long-term energized state and the burnout of the relay due to excessive current. In addition, the utility model sets two Static contact, after the coil assembly is energized, it generates magnetic force to attract the armature, and the armature pushes the moving reed, so that the moving reed is connected to one of the static contact terminals. After power off, the moving reed returns under its own elastic force, making the moving reed The reed is connected to the static contact terminal, and the elastic force of the armature and the movable reed is controlled by the power-off and energization of the coil assembly, that is, the magnetic force and the mechanical elastic force are combined to realize a movable contact that can control the opening and closing of the two-way switch, effectively The volume of the overall relay is reduced.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the hidden housing of the present invention.

Fig. 3 is a schematic diagram of the belt housing of the present invention.

Fig. 4 is a schematic diagram of the moving reed of the present invention.

Fig. 5 is a schematic diagram of the armature of the present invention.

The reference signs are respectively:

Base--1, coil assembly--2, bracket--21, fixed core--22, coil--23, yoke--3, armature--4, bump--41, moving reed- -5, contact part--51, contact point--52, bending part--53, installation hole--54, protection resistor--6, static contact part--7, static contact terminal--71, power supply terminal --8, installation groove --9, output terminal --10, step-off slope --11, protective shell --12, side groove --13.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the implementation modes are not limitations of the utility model. Below in conjunction with accompanying drawing, the utility model is described in detail.

Please refer to Figures 1 to 5, a protective relay provided by the utility model includes a base, a coil assembly 2, a yoke 3, an armature 4, a moving reed 5, a protection resistor 6, a static contact 7 and Two power supply terminals 8, the static contact portion 7 includes two static contact terminals 71, one end of the static contact portion 7 is arranged on the base, one end of the yoke 3 is connected to the base 1 connected, the other end of the yoke 3 is connected to one end of the moving reed 5, one end of the armature 4 is mounted on the moving reed 5 of the yoke 3, and the other end of the moving reed 5 Connected with the armature 4, the coil assembly 2 is installed on the yoke 3, the coil assembly 2 attracts the armature 4 under the action of magnetic force and then drives the moving reed 5 to move, and the moving reed 5 is used to conduct two One of the two static contact terminals 71, the power supply terminal 8 is electrically connected to the coil assembly 2, and the two ends of the protection resistor 6 are respectively connected to the two power supply terminals 8.

The protective relay is equipped with a protective resistor 6 on the two power supply terminals 8, which can effectively prevent the relay from being damaged due to the long-term energized state and the relay from being burned out due to excessive current. Two static contacts, the coil assembly 2 generates magnetic force to attract the armature 4 after the coil assembly 2 is energized, and the armature 4 pushes the moving reed 5, so that the moving reed 5 is connected to one of the static contact terminals 71. After the power is turned off, the moving reed 5 Recover under the action of its own elastic force, so that the movable reed 5 is connected to the static contact terminal 71, and the self-elastic effect of the armature 4 and the movable reed 5 is controlled through the power-off and energization of the coil assembly 2, that is, the magnetic force and the mechanical elastic force are combined. Realizing a moving contact can control the opening and closing of the two-way switch, which effectively reduces the volume of the overall relay.

In this embodiment, in order to prevent poor contact of the protective resistor 6 due to displacement of the protective resistor 6 during the working process of the utility model, an installation groove 9 for fixing the protective resistor 6 is provided on the base.

The coil assembly 2 includes a bracket 21, a fixed iron core 22 and a coil, the bracket 21 is fixed on the yoke 3, the fixed iron core 22 is fixed on the bracket 21, the coil is sleeved on the outside of the bracket 21, and the coil surrounds On the iron core, one side of the armature 4 is in contact with one end of the coil. When the coil assembly 2 is energized, the coil generates a magnetic field. Under the action of the magnetic field, the magnetic field attracts the armature 4, and the armature 4 pushes the moving reed 5, so that the moving spring The piece 5 contacts one of the two static contact points 52. When the coil assembly 2 is powered off, the magnetic field disappears, and the movable reed 5 returns under its own elastic force to contact the other static contact point 52.

In this embodiment, in order to prevent the movable reed 5 from being in contact with the static contact point 52, a dynamic contact part is provided at the lower end of the movable reed 5, and a movable contact is provided at the movable contact part.

In order to further increase the mechanical resilience of the moving reed 5 itself, the moving reed 5 is bent into an "L" shape, that is, a bending part 53 is provided in the middle of the moving reed 5, and a mounting hole is arranged at the bending part 53. 54, and a number of bumps 41 are set on the armature 4. The combination of the mounting holes 54 and the bumps 41 can facilitate the installation of the moving reed 5 on the armature 4, preventing the moving reed 5 from shifting during use. Caused by poor contact and so on.

In this embodiment, the two static contact parts 7 also include two output terminals 10, the two output terminals 10 are respectively connected to the two static contact terminals 71, and one end of the two output terminals 10 is fixed on the base, The other ends of the two output terminals 10 extend to the outside of the base.

In this embodiment, in order to facilitate the conduction between the movable reed 5 and the static contact terminal 71 close to the armature 4 , a step-off slope 11 is provided on the side of the armature 4 where the movable reed 5 is installed.

In this embodiment, the protective relay also includes a housing that is arranged on the outside of the base, and the base is provided with a side slot 13 for installing the housing, and the housing can protect the electronics inside the utility model. components to prevent damage.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as above with the preferred embodiment, it is not used to limit the utility model. Anyone who is familiar with the utility model Professional technicians, without departing from the scope of the technical solution of the present utility model, should use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present utility model, the The utility model technology refers to any simple modification, equivalent change and modification made to the above embodiments, which all belong to the scope of the utility model technical solution.

Claims (10)

1. a kind of protection relay, it is characterised in that：Including pedestal, coil block, yoke, armature, movable contact spring, protection electricity Resistance, quiet contact site and two power supply terminals, the quiet contact site include two quiet contact terminals, and one end of the quiet contact site is equal It is arranged on the pedestal, one end of the yoke is connected with the pedestal, the other end of the yoke and one end of movable contact spring Connection, the armature are installed in the other end of movable contact spring, and the coil block is installed on the yoke, and the coil block exists Attract armature under magneticaction and then drive movable contact spring movement, the movable contact spring is for one in two quiet contact terminals of conducting A, described two power supply terminals and the coil block are electrically connected, the both ends of the protective resistance respectively with two feeder ears Son connection.

2. a kind of protection relay according to claim 1, it is characterised in that：It is provided on the pedestal and is installed with protection The mounting groove of resistance.

3. a kind of protection relay according to claim 1, it is characterised in that：The coil block includes stent, consolidates Fixed core and coil, the stent are fixed on pedestal, and the secured core is fixed on stent, and the coil is sheathed on outside stent Side, on iron core, one end of yoke and the end thereof contacts of secured core, the other end of secured core are used to inhale the coil encircling Draw armature.

4. a kind of protection relay according to claim 1, it is characterised in that：The movable contact spring include dynamic abutting portion and The movable contact of dynamic abutting portion is installed in, armature is installed in dynamic abutting portion, and the dynamic abutting portion is arranged at movable contact spring lower end.

5. a kind of protection relay according to claim 1, it is characterised in that：The movable contact spring is provided with bending part, Mounting hole is provided at the bending part.

6. a kind of protection relay according to claim 1, it is characterised in that：The armature is provided with to install dynamic Several convex blocks of reed.

7. a kind of protection relay according to claim 1, it is characterised in that：Described two quiet contact sites further include two A leading-out terminal, two leading-out terminals are connected respectively with two quiet contact terminals.

8. a kind of protection relay according to claim 7, it is characterised in that：One end of two leading-out terminals is fixed In on pedestal, the other end of two leading-out terminals is extended to outside pedestal.

9. a kind of protection relay according to claim 1, it is characterised in that：The one side of the armature installation movable contact spring It is provided with resigning inclined-plane.

10. a kind of protection relay according to claim 1, it is characterised in that：The protection relay further includes The housing on the outside of the pedestal is covered at, the pedestal is equipped with to be installed with the side channel of housing.