CN108447740B

CN108447740B - Relay

Info

Publication number: CN108447740B
Application number: CN201810560002.4A
Authority: CN
Inventors: 陈岳建; 许赟军
Original assignee: NINGBO ZETTLER ELECTRONICS CO LTD
Current assignee: NINGBO ZETTLER ELECTRONICS CO LTD
Priority date: 2018-06-02
Filing date: 2018-06-02
Publication date: 2024-04-19
Anticipated expiration: 2038-06-02
Also published as: CN108447740A

Abstract

The invention discloses a relay, which comprises a base, wherein an iron core, a supporting rod, a movable contact piece and a static contact piece are arranged on the base, a coil is wound on the iron core, an armature is arranged on the supporting rod, the middle part of the armature is rotationally connected to the supporting rod, one end of the armature is positioned at the top of the iron core, and the other end of the armature is positioned at one side of the movable contact piece, and the relay is characterized in that: the armature divide into first fin and second fin, the second fin is located the intermediate position of first fin, the second fin is located the one end bottom of movable contact piece links to each other with the spring, the other end of spring is connected on the base under the effect of spring the second fin is apart from the iron core a certain distance, and this distance ensures when the coil switch-on state, the iron core is right the attraction of second fin is less than the pulling force of spring, be provided with the baffle on the first fin.

Description

Relay

Technical Field

The present invention relates to a relay.

Background

The contacts on the relay are required to have small contact resistance and oxidation resistance, so silver is generally used as a contact material, and is a noble metal and high in price. Although the contact resistance of silver is small, the melting point of silver is relatively low, and in some occasions with high voltage and high current, the silver contacts are not burnt by electric arcs, adhesion is easy to form between the silver contacts after burning, and the service life of a relay is also greatly shortened, so that improvement is needed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the relay, which can prevent the silver contact from being burnt by an electric arc at the moment of contact and disconnection, thereby prolonging the service life of the relay.

In order to solve the technical problems, the invention is solved by the following technical scheme: the relay comprises a base, wherein an iron core, a supporting rod, a movable contact sheet and a static contact sheet are arranged on the base, a coil is wound on the iron core, an armature is arranged on the supporting rod, the middle part of the armature is rotationally connected to the supporting rod, one end of the armature is positioned at the top of the iron core, the other end of the armature is positioned at one side of the movable contact sheet, the armature is divided into a first fin and a second fin, the second fin is positioned at the middle position of the first fin, the second fin is positioned at the bottom of one end of the movable contact sheet and connected with a spring, the other end of the spring is connected to the base, the second fin is positioned at a certain distance from the iron core under the action of the spring, the distance ensures that the attraction of the iron core to the second fin is smaller than the tensile force of the spring when the coil is in a conducting state, a baffle is arranged on the first fin, the baffle is blocked by the second fin, the baffle is positioned at a certain distance from the first fin, and the first fin is also positioned at the top of the first fin when the coil is in a certain distance from the conducting state, and the iron core is also adsorbed to the top of the first fin when the first fin is in a certain distance from the first contact sheet to the top of the iron core, and the first fin is also in a certain distance from the first contact sheet when the first fin is in a certain conducting state, and the first contact sheet is adsorbed to the top at the top, the static contact is provided with a second silver contact and a second graphite contact which are matched with the first silver contact and the first graphite contact, the first contact is matched with the first fin, and the second contact is matched with the second fin. When the relay is connected with a circuit, the coil is conducted, the iron core generates magnetic force, one end of the first fin is attracted to the iron core until the end of the first fin is adsorbed to the iron core, in the process, the other end of the first fin pushes the first contact to a position contacted with the static contact, the first graphite contact and the second graphite contact are conducted, in the conducting process, larger heat can be generated due to larger resistance of the graphite contact, but the graphite contact is not easy to damage due to the characteristics of high melting point resistance and no oxidization of graphite. Meanwhile, one end of the first fin is close to the iron core and drives the second fin to be close to the iron core, along with the approach of the distance, the adsorption force of the iron core to the second fin is larger and larger until the tension force of the spring to the second iron core is exceeded, the second fin is adsorbed to the iron core, at the moment, the second fin pushes the second contact to be in contact with the static contact, and the first silver contact is connected with the second silver contact. Because the circuit is conducted before the first silver contact and the second silver contact are contacted, heat is not generated when the first silver contact and the second silver contact are contacted, and the contact resistance of the whole relay is greatly reduced due to the conduction of the first silver contact and the second silver contact. When the relay is disconnected, the coil is powered off, the first fin firstly leaves the top of the iron core under the action of the spring, the first contact piece loses the support of the first fin and is separated from the static contact piece, namely, the first silver contact and the second silver contact are separated, and at the moment, the first graphite contact and the second graphite contact are not separated, so that electric arcs and sparks can not be generated when the first silver contact and the second silver contact are separated. Therefore, in the switching-on and switching-off processes of the relay, the silver contacts cannot generate electric arcs and heat, damage to the silver contacts is avoided, and the service life of the relay is greatly prolonged.

In the above technical solution, preferably, the first fin and the second fin are an iron sheet with a corner, and the corner of the iron sheet is hinged on the supporting rod.

In the above technical solution, preferably, the angles of the corners of the first fin and the second fin are the same.

The beneficial effects of the invention are as follows: in the switching-on and switching-off processes of the relay, the silver contacts cannot generate electric arcs and heat, damage to the silver contacts is avoided, and the service life of the relay is greatly prolonged.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic view of the first fin according to the present invention attached to the core.

Fig. 3 is a schematic view illustrating the adsorption of the second fin to the core according to the present invention.

Fig. 4 is a schematic view of a movable contact.

Fig. 5 is a schematic view of a stationary contact.

Detailed Description

The invention is described in further detail below with reference to the attached drawings and detailed description:

Referring to fig. 1 to 5, a relay comprises a base 1, wherein an iron core 2, a supporting rod 3, a movable contact 4 and a static contact 5 are arranged on the base 1, and a coil 21 is wound on the iron core 2.

The armature 6 is arranged on the support rod 3, the middle part of the armature 6 is rotationally connected to the support rod 3, one end of the armature 6 is positioned at the top of the iron core 2, and the other end of the armature 6 is positioned at one side of the movable contact 4.

The armature 6 is divided into a first fin 61 and a second fin 62. The first fin and the second fin are iron sheets with one corner, and the corner of each iron sheet is hinged to the supporting rod. The angles of the corners of the first fin and the second fin are the same.

The second fin 62 is located at the middle position of the first fin 61, the second fin 62 is located at the bottom of one end of the movable contact 4 and connected with the spring 7, the other end of the spring 7 is connected to the base 1, the second fin 62 is at a certain distance from the iron core 2 under the action of the spring 7, and the distance ensures that when the coil 21 is in a conducting state, the attractive force of the coil 21 to the second fin 62 is smaller than the tensile force of the spring 7.

The first fin 61 is provided with a baffle 611, the baffle 611 blocks the second fin 62, the baffle 611 is at a certain distance from the plane where the first fin 61 is located, when the coil 21 is in a non-conducting state, due to the effect of the baffle 611, the first fin 61 is driven by the second fin 62 to be at a certain distance from the iron core 2, when the coil 21 is in a conducting state, the iron core 2 adsorbs the first fin 61, the first fin 61 overcomes the tensile force of the spring 7 and is adsorbed to the top of the iron core 2, meanwhile, the distance from the second fin 62 to the iron core 2 is also pulled in, at this time, the second fin 62 is also adsorbed to the top of the iron core 2, the movable contact 4 is divided into two parts, namely, a second fin 42 positioned in the middle and a first contact 41 positioned on the outer ring, the top of the first fin 41 is provided with a first silver contact 411, the second fin 42 is provided with a first graphite fin 421 and a second contact 411, and a second graphite contact 421 are matched with the first graphite fin 41 and the second contact 41.

When the relay is connected with a circuit, the coil is conducted, the iron core generates magnetic force, one end of the first fin is attracted to the iron core until the end of the first fin is adsorbed to the iron core, in the process, the other end of the first fin pushes the first contact to a position contacted with the static contact, the first graphite contact and the second graphite contact are conducted, in the conducting process, larger heat can be generated due to larger resistance of the graphite contact, but the graphite contact is not easy to damage due to the characteristics of high melting point resistance and no oxidization of graphite. Meanwhile, one end of the first fin is close to the iron core and drives the second fin to be close to the iron core, along with the approach of the distance, the adsorption force of the iron core to the second fin is larger and larger until the tension force of the spring to the second iron core is exceeded, the second fin is adsorbed to the iron core, at the moment, the second fin pushes the second contact to be in contact with the static contact, and the first silver contact is connected with the second silver contact. Because the circuit is conducted before the first silver contact and the second silver contact are contacted, heat is not generated when the first silver contact and the second silver contact are contacted, and the contact resistance of the whole relay is greatly reduced due to the conduction of the first silver contact and the second silver contact. When the relay is disconnected, the coil is powered off, the first fin firstly leaves the top of the iron core under the action of the spring, the first contact piece loses the support of the first fin and is separated from the static contact piece, namely, the first silver contact and the second silver contact are separated, and at the moment, the first graphite contact and the second graphite contact are not separated, so that electric arcs and sparks can not be generated when the first silver contact and the second silver contact are separated. Therefore, in the switching-on and switching-off processes of the relay, the silver contacts cannot generate electric arcs and heat, damage to the silver contacts is avoided, and the service life of the relay is greatly prolonged.

Claims

1. The utility model provides a relay, includes the base, be provided with iron core, branch on the base, movable contact and static contact, the winding has the coil on the iron core, be provided with the armature on the branch, the armature middle part rotates to be connected on the branch, the one end of armature is located the top of iron core, the other end of armature is located one side of movable contact, its characterized in that: the armature is divided into a first fin and a second fin, the second fin is positioned in the middle of the first fin, the second fin is positioned at the bottom of one end of the movable contact piece and connected with a spring, the other end of the spring is connected with the base, the second fin is at a certain distance from the iron core under the action of the spring, the distance ensures that when the coil is in a conducting state, the attraction force of the iron core to the second fin is smaller than the tensile force of the spring, a baffle is arranged on the first fin, the baffle blocks the second fin, the baffle is at a certain distance from the plane where the first fin is positioned, when the coil is in a non-conducting state, the first fin is driven by the second fin and at a certain distance from the iron core due to the action of the baffle, when the coil is in a conducting state, the iron core adsorbs the first fin, the first fin overcomes the tensile force of the spring and is adsorbed to the top of the iron core, meanwhile, the distance from the second fin to the iron core is also pulled to be close, at the moment, the second fin is adsorbed to the top of the iron core, the movable contact is divided into two parts, namely a second fin positioned in the middle and a first fin positioned on the outer ring, the top of the first fin is provided with a first silver contact, the second fin is provided with a first graphite contact, the static fin is provided with a second silver contact and a second graphite contact which are matched with the first silver contact and the first graphite contact, the first fin is matched with the first fin, the second fin is matched with the second fin, the first fin and the second fin are iron fins with a corner, the corner of the iron fin is hinged on the supporting rod, the angles of the corners of the first fin and the second fin are the same.