CN116417284A - Electromagnetic relay with arc extinguishing function - Google Patents

Abstract

The invention discloses an electromagnetic relay with an arc extinguishing function, which comprises a base, a shell, a magnetic circuit mechanism, a driving mechanism and a contact mechanism, wherein the magnetic circuit mechanism, the driving mechanism and the contact mechanism are arranged on the base; the housing is arranged outside the shell, is close to the contact mechanism and is connected with the shell; the magnetic pole direction of the magnetic steel is perpendicular to the current direction when the movable contact and the stationary contact are contacted. The invention does not change the volume of the original relay body, and effectively reduces the manufacturing cost under the condition of having an arc extinguishing function.

Description

Electromagnetic relay with arc extinguishing function

Technical Field

The invention relates to the technical field of electromagnetic relay manufacturing, in particular to an electromagnetic relay with an arc extinguishing function.

Background

An electromagnetic relay is an electronic control device, which is an automatic switch for controlling larger current and higher voltage by using smaller current and lower voltage, and is widely applied to the existing automatic control circuit. The existing electromagnetic relay is provided with a contact mechanism, when the current and the voltage reach a certain value, particularly when the electromagnetic relay is applied to direct current control, the contact of the relay is easy to generate an electric arc when being disconnected, the electric arc has a thermal effect, the contact is easy to ablate and adhere, plastic parts around the contact are ablated, the surface of the plastic parts is carbonized, the surface insulation of the plastic parts is reduced, the product is invalid, and the service life of the relay is greatly shortened. The rapid extinction of the contacts when they are opened is therefore a major technical concern.

Nowadays, it is known that the addition of the magnetic steel to the relay can assist in elongating the arc to achieve the technical effect of rapid arc extinction, but how to arrange the magnetic steel also specifically affects factors such as the size of the relay, assembly difficulty, arc extinction effect, manufacturing cost and the like, so that larger structural change is brought to the electromagnetic relay with the magnetic steel.

The existing relay with arc extinguishing function is usually provided with magnetic steel in an additionally arranged shell, so that the volume of the original relay body is inevitably increased, for example, a Chinese patent with the patent number ZL201520459636.2 and the name of high-voltage direct current relay is disclosed in the year 2015, 11 and 18, two opposite side walls of the upper part of the shell are respectively provided with an outwards protruding part, the protruding part is provided with an upper opening, and the magnetic steel is placed into the protruding part of the shell from the upper opening of the protruding part of the shell and fixed by dispensing. This kind of high-voltage direct current relay can promote quick arc extinguishing effect through a plurality of magnet steel stack magnetic field intensity, but be equipped with outside convex part respectively at two relative lateral walls on shell upper portion and can not avoid increasing relay body's volume, and the magnet steel is put into the convex part of shell by the upper shed of shell convex part and is fixed mounting means through the point gum looks and misplaced magnet steel magnetic pole direction more easily and be difficult to be found, has increased the assembly degree of difficulty. In addition, because the relay body is increased, the production line for producing the alternating current relay cannot be compatible with the production of the direct current relay, and large cost is required to be invested again to update equipment, so that repeated investment is caused.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electromagnetic relay with an arc extinguishing function, which does not change the volume of an original relay body, so that an original production line can be compatible with the production of an alternating current relay and a direct current relay, and the manufacturing cost of the direct current relay is reduced.

In order to achieve the above purpose, the technical scheme of the invention is as follows: the electromagnetic relay with the arc extinguishing function comprises a base, a shell, a magnetic circuit mechanism, a driving mechanism and a contact mechanism, wherein the magnetic circuit mechanism, the driving mechanism and the contact mechanism are arranged on the base; the housing is arranged outside the shell, is close to the contact mechanism and is connected with the shell; the magnetic pole direction of the magnetic steel is perpendicular to the current direction when the movable contact and the stationary contact are contacted.

Preferably, the cover is connected to the outer surface of the housing by welding or clamping or bonding.

Still preferably, the relay further comprises two housings, wherein the two housings are a left housing and a right housing, magnetic steel is respectively arranged in the left housing and the right housing, the left housing is arranged on the left side of the housing close to the contact mechanism and is connected with the housing, the right housing is arranged on the right side of the housing close to the contact mechanism and is connected with the housing, the magnetic pole direction of each magnetic steel is perpendicular to the current direction when the movable contact and the static contact are contacted, the two magnetic steels are opposite left and right, and the polarities of the opposite faces of the two magnetic steels are opposite. Therefore, by means of superposition of the two magnetic steels, the magnetic field strength can be better enhanced, and the arc extinguishing effect is better.

Further improvement, the upper end surface of the left housing extends to one side of the shell, a left positioning part is arranged on the left positioning part, a left concave area is arranged on the upper end surface of the shell near the left side, a left positioning convex part is arranged on the left concave area, and the left positioning convex part is matched with the left positioning groove; the upper end face of the right housing extends to one side of the shell, a right positioning portion is arranged on the right positioning portion, a right concave area is arranged on the upper end face of the shell close to the right side, a right positioning convex portion is arranged on the right concave area, and the right positioning convex portion is matched with the right positioning groove. The left cover shell and the right cover shell are convenient to fix and connect with the shell, assembly is convenient, and the two magnetic steels can be more accurately opposite left and right.

Further improved, the inner bottoms of the left cover shell and the right cover shell are respectively provided with a positioning protrusion, the bottoms of the magnetic steels are provided with matching grooves, and the matching grooves of the magnetic steels are matched with the positioning protrusions. Thus, the positioning of the magnetic steel and the left housing or the right housing is facilitated, and the polarity misplacement of the magnetic steel can be prevented.

Further improvement, the left cover shell and the right cover shell are generally square, two left vertical grooves are formed in the left side of the shell, two right vertical grooves are formed in the right side of the shell, a plurality of protruding connecting convex parts are respectively formed in two vertical edges of the left cover shell and the shell, the connecting bottom edge of the left cover shell and the shell are contracted inwards to form an inner step, a plurality of connecting convex parts are also formed on the inner step, the plurality of connecting convex parts of the two vertical edges of the left cover shell are respectively clamped into the two left vertical grooves in the left side of the shell, the plurality of connecting convex parts on the inner step of the bottom edge of the left cover shell lean against the left side of the shell, and the left cover shell and the shell are welded and fixedly connected together through ultrasonic melting; the right housing and the shell are connected with the bottom edge part and shrink inwards to form an inner step, a plurality of connecting convex parts are also arranged on the inner step, the connecting convex parts on the two vertical edges of the right housing are respectively clamped into the two vertical right vertical grooves on the right side of the shell, the connecting convex parts on the inner step of the bottom edge of the right housing lean against the right side surface of the shell, and the connecting convex parts melt through the action of ultrasonic waves to weld and fixedly connect the right housing with the shell. The plurality of connecting convex parts arranged in the way can be favorable for adopting ultrasonic welding, so that the left housing and the right housing are firmly fixedly connected with the shell.

As an improvement, still include an inverted U-shaped support piece, inverted U-shaped support piece is made by magnetic conduction material, the casing is close to the up end undercut that contacts mechanism forms the groove of stepping down, left side housing and right housing are square shape roughly, left side housing upper end is equipped with left opening, right side housing upper end is equipped with right opening, inverted U-shaped support piece includes two parallel support arms and connects the middle support arm of two support arms, and middle support arm medial surface leans on the groove bottom surface of stepping down, and two parallel support arms insert respectively in left housing and the right housing, and two support arm inboards are connected with a magnet steel respectively. The two magnetic steels are connected through the magnetic conduction inverted U-shaped support piece, so that the magnetic flux loss between the two magnetic steels is reduced, the magnetic flux density of the opening and closing positions of the contacts is improved, the magnetic field intensity is enhanced, and the arc extinguishing effect is better.

Further improved, two outside of the support arm are provided with clamping bulges, the left cover shell and the right cover shell are provided with clamping matching holes, and each clamping bulge is matched with one clamping matching hole. Thus, the inverted U-shaped supporting piece can be well positioned and fixedly connected with the left housing and the right housing.

Further improved, one side of the abdication groove is provided with an upper positioning convex part, one side of the middle supporting arm is provided with a positioning groove, and the positioning groove on one side of the middle supporting arm is matched with the upper positioning convex part. The inverted U-shaped support and the housing can be better positioned.

Further improved, a supporting convex part is inwards extended on one side of each support arm close to the base, a matching groove is formed on one side of each magnetic steel close to the base, and the matching groove is matched with the supporting convex part. Thus, the support arm and the magnetic steel are convenient to position mutually, and the polarity misplacement of the magnetic steel can be prevented. The inner side surface of the middle supporting arm is provided with a plurality of limiting convex parts close to each supporting arm, and the limiting convex parts limit one side of the magnetic steel. The gap between the inner side surface of the middle supporting arm and the magnetic steel is enlarged, the air magnetic resistance is increased, and the magnetic force lines from the N pole to the S pole are prevented from being lost.

Further improved, the left side of the shell is provided with two left vertical grooves and a left transverse groove connected with the lower ends of the two left vertical grooves, a plurality of connecting bulges are distributed on the two left vertical grooves and the left transverse groove, and the plurality of connecting bulges butt-joint the two vertical edges and one bottom edge of the left shell and melt the left shell and the shell through ultrasonic action to be welded and fixedly connected together; the right side of casing is equipped with two right vertical grooves and connects two right vertical grooves lower extreme right transverse groove, and two right vertical grooves and right transverse groove are last to be distributed has a plurality of connection protruding, and a plurality of connection protruding butt joints two vertical limits and a base of right housing are melted through the ultrasonic wave effect right housing with the casing welding links firmly together. The plurality of connecting convex parts are arranged to facilitate the adoption of ultrasonic welding.

The U-shaped support piece is made of magnetic conductive materials, a clamping groove is formed in one side, close to the contact mechanism, of the shell, the clamping groove extends from the upper end face of the shell to one side of the base, the left cover shell and the right cover shell are approximately square, the U-shaped support piece comprises two parallel support arms and a middle support arm connected with the two support arms, the middle support arm is clamped into the clamping groove from top to bottom and supported on the shell, the two parallel support arms are respectively located in the left cover shell and the right cover shell, and the inner side faces of the two support arms are respectively connected with one magnetic steel. On the one hand, the two magnetic steels are connected through the magnetic conductive U-shaped support piece, so that the magnetic flux loss between the two magnetic steels is reduced, the magnetic flux density of the opening and closing positions of the contacts is improved, the magnetic field intensity is enhanced, and the arc extinguishing effect is better; on the other hand, the automatic assembly is convenient to realize.

Further improvement, every support arm is close to base one side is equipped with down the joint arch, and every support arm is kept away from base one side is equipped with the joint arch, and the upside of left housing and right housing all is equipped with the joint hole, and the downside of left housing and right housing all is equipped with down the joint hole, and the last joint hole on left housing and the right housing cooperatees with the last joint arch on a support arm respectively, and the lower joint hole on left housing and the right housing cooperatees with the lower joint arch on a support arm respectively. Therefore, the left housing and the right housing are respectively fixedly connected with the two support arms in a clamping manner, and the assembly is more convenient.

Further improvement, the left side wall and the right side wall of the shell are respectively provided with a clamping hole close to the bottom of the clamping groove, the middle part of the middle supporting arm extends to one side to form a clamping part, the outer sides of the two ends of the clamping part are respectively provided with a clamping hook, and the two sides of the middle supporting arm close to the clamping part are also provided with two abdicating grooves which can be respectively clamped into the left side wall and the right side wall of the shell; when the middle supporting arm is clamped into the clamping groove and supported on the shell, each clamping hook is clamped into one clamping hole. Therefore, the U-shaped support piece and the shell are clamped more firmly.

Further improved, a supporting convex part is inwards extended on one side of each support arm close to the base, a matching groove is formed on one side of each magnetic steel close to the base, and the matching groove is matched with the supporting convex part. The mutual positioning of the magnetic steel and the support arm is convenient, and the polarity misplacement of the magnetic steel is prevented.

Further improved, the inner side surface of the middle supporting arm is provided with a plurality of limiting convex parts close to each supporting arm, and the limiting convex parts limit one side of the magnetic steel. Through the limiting action of a plurality of limiting convex parts, the inner side surface of the middle supporting arm is prevented from being in direct contact with the side surface of the magnetic steel, the gap between the inner side surface of the middle supporting arm and the magnetic steel is enlarged, the air magnetic resistance is increased, and the magnetic force lines from the N pole to the S pole are prevented from being lost.

Preferably, two static spring plates and two movable spring plates are arranged on the base side by side, two static spring plate leading-out feet extend out from the lower surface of the base, and two movable spring plate leading-out feet also extend out from the lower surface of the base;

the magnetic circuit mechanism comprises a coil framework, an iron core, an L-shaped yoke iron and an L-shaped armature iron, wherein the coil framework is fixedly connected to the base along the vertical direction, a coil is arranged on the coil framework, the iron core is arranged on a middle through hole of the coil framework in a penetrating mode, one end of the L-shaped yoke iron is fixedly connected with the lower end of the iron core, the connection position of the two ends of the L-shaped armature iron is leaned against the upper end of the L-shaped armature iron, the outer side of the L-shaped yoke iron is fixedly connected with the lower end of a pressing spring, the upper end of the pressing spring presses one end of the L-shaped armature iron to enable one end of the L-shaped armature iron to lean against the L-shaped yoke iron, when the coil is powered, the other end of the L-shaped armature iron is attracted with the other end of the iron core, and when the coil is powered off, the other end of the L-shaped armature iron is separated from the other end of the iron core;

the driving mechanism comprises a pushing piece, wherein the pushing piece comprises a body, one side of the body is provided with a connecting part connected with one end of an L-shaped armature, the other side of the body is provided with two parallel pushing parts, and when the other end of the L-shaped armature is attracted with the other end of the iron core, the two pushing parts respectively push two movable contacts on the two movable reeds and two static contacts on the two static reeds to be attracted; when the other end of the L-shaped armature is separated from the other end of the iron core, the two movable springs are reset, and the two movable contacts are separated from the two stationary contacts;

two supporting plates are arranged on the base side by side, one end of each movable reed leans against one supporting plate when the movable reed resets, a guide through hole is further formed in each supporting plate, and each pushing part penetrates through one guide through hole. The reciprocating motion precision of the pushing part can be further improved through the guiding action of the guiding through hole, and the action reliability is improved; in addition, through the supporting effect of the two supporting sheets, the movable reed can be prevented from tilting backwards and deforming by taking the pushing point as a fulcrum when falling, and the gap between the movable contact and the static contact is more stable in the working process.

Because the housing is additionally arranged outside the shell of the relay, the magnetic steel is arranged in the housing, and then the housing is arranged outside the shell, is close to the contact mechanism and is connected with the shell, and the magnetic pole direction of the magnetic steel is perpendicular to the current direction when the movable contact and the static contact are contacted. Therefore, the volume of the original relay body is not required to be changed, the original relay production line can be compatible with the production of an alternating current relay and a direct current relay, repeated investment is avoided, and the manufacturing cost of the direct current relay is effectively reduced under the condition of having an arc extinguishing function.

Drawings

FIG. 1 is a perspective view of a first embodiment of the present invention;

FIG. 2 is a perspective view of the hidden housing, left and right shells and two magnetic steels of FIG. 1;

FIG. 3 is an exploded perspective view of FIG. 2;

FIG. 4 is a perspective view of a housing according to a first embodiment of the present invention;

FIG. 5 is a perspective view of the left and right housings and two magnetic steels in a separated state according to the first embodiment of the present invention;

FIG. 6 is a perspective view of a first embodiment of the present invention wherein the left and right housings are each provided with a magnetic steel;

fig. 7 is a schematic view showing an arc extinguishing state according to the first embodiment of the present invention;

FIG. 8 is a perspective view of a second embodiment of the present invention;

FIG. 9 is a perspective view of the hidden housing, left and right shells, inverted U-shaped support and two magnetic steels of FIG. 8;

FIG. 10 is a perspective view of a housing according to a second embodiment of the present invention;

FIG. 11 is a perspective view of a second embodiment of the invention with the housing connecting the left and right shells;

FIG. 12 is a perspective view of an inverted U-shaped support according to a second embodiment of the invention;

FIG. 13 is a perspective view of an inverted U-shaped support of a second embodiment of the invention connecting two magnetic steels;

FIG. 14 is a perspective view of a third embodiment of the present invention;

FIG. 15 is a perspective view of the hidden housing, left housing shell and right housing shell of FIG. 14;

FIG. 16 is a perspective view showing a third embodiment of the present invention in which the housing is separated from the left housing, the right housing, the U-shaped support, and the two magnetic steels;

FIG. 17 is a top view of a third embodiment of the present invention;

FIG. 18 is a cross-sectional view A-A of FIG. 17;

fig. 19 is a schematic view showing an arc extinguishing state according to a third embodiment of the present invention.

Detailed Description

The invention will be described in further detail with reference to the drawings and the detailed description.

An electromagnetic relay with arc extinguishing function is shown in fig. 1 to 6, which comprises a base 1, a shell 2, a magnetic circuit mechanism 3, a driving mechanism 4, a contact mechanism 5, a left shell 6 and a right shell 7, wherein the magnetic circuit mechanism 3, the driving mechanism 4 and the contact mechanism 5 are arranged on the base 1, the body of the shell 2 is in a square shape, the base 1 and the shell 2 are made of plastic in an injection molding way, the shell 2 is connected with the base 1 and covers the magnetic circuit mechanism 3, the driving mechanism 4 and the contact mechanism 5, the contact mechanism 5 comprises a fixed reed 51 and a movable reed 52 corresponding to the fixed reed 51, two fixed reeds 51 and two movable reeds 52 are arranged on the base 1 side by side, one fixed contact 511 is arranged on each fixed reed 51, one movable contact 521 is arranged on each movable reed 52, two fixed reed leading-out feet 512 extend from the lower surface of the base 1, and two movable reed leading-out feet 522 extend from the lower surface of the base 1; the magnetic force generated by the magnetic circuit mechanism 3 causes the driving mechanism 4 to operate, and the driving mechanism 4 causes the movable reed 52 to operate so that each movable contact 521 is engaged with or disengaged from one stationary contact 511.

The left housing 6 and the right housing 7 are respectively provided with magnetic steels 8, the left housing 6 is arranged on the left side of the shell 2 close to the contact mechanism 5 and is connected with the shell 2, the right housing 7 is arranged on the right side of the shell 2 close to the contact mechanism 5 and is connected with the shell 2, the magnetic pole direction of each magnetic steel 8 is perpendicular to the current direction when the movable contact 512 and the static contact 511 are contacted, the two magnetic steels 8 are opposite left and right, and the polarities of the opposite surfaces of the two magnetic steels 8 are opposite.

The left housing 6 is connected with the left side surface of the shell 2 in an ultrasonic welding mode, and can also be connected in a clamping mode or an adhesive mode; the right housing 7 is connected to the right side surface of the housing 2 by ultrasonic welding, and can also be connected by clamping or bonding.

The upper end surface of the left housing 6 extends to one side of the shell 2, a left positioning part 61 is arranged on the left positioning part 61, a left concave area 21 is arranged on the upper end surface of the shell 2 near the left side, a left positioning convex part 22 is arranged on the left concave area 21, and the left positioning convex part 22 is matched with the left positioning groove 62; the upper end surface of right housing 7 extends to casing 2 one side and has right location portion 71, is equipped with right constant head tank 72 on the right location portion 71, the casing 2 up end is close to the right side and is equipped with right concave region 23, is equipped with right location convex part 24 on the right concave region 23, and right location convex part 24 cooperatees with right constant head tank 72.

The inner bottoms of the left housing 6 and the right housing 7 are respectively provided with a positioning protrusion 67, the bottom of the magnetic steel 8 is provided with a matching groove 81, and the matching groove 81 of the magnetic steel 8 is matched with the positioning protrusion 67. Thus, the mutual positioning of the magnetic steel 8 and the left housing 6 or the right housing 7 is facilitated, and the polarity of the magnetic steel 8 is prevented from being misplaced.

The left cover shell 6 and the right cover shell 7 are approximately square, two left vertical grooves 25 are formed in the left side of the shell 2, two right vertical grooves 26 are formed in the right side of the shell 2, a plurality of protruding connecting convex parts 60 are respectively formed in two vertical edges of the left cover shell 6 connected with the shell 2, the connecting bottom edge part of the left cover shell 6 and the shell 2 are contracted inwards to form an inner step, a plurality of connecting convex parts 60 are also formed on the inner step, the plurality of connecting convex parts 60 on the two vertical edges of the left cover shell 6 are respectively clamped into the two left vertical grooves 25 on the left side of the shell 2, the plurality of connecting convex parts 60 on the inner step on the bottom edge of the left cover shell 6 lean against the left side of the shell 2, and the plurality of connecting convex parts 60 are welded and fixedly connected with the left cover shell 6 and the shell 2 through ultrasonic wave action; the bottom edge part of the right housing 7 connected with the shell 2 is contracted inwards to form an inner step, a plurality of connecting convex parts 60 are also arranged on the inner step, the plurality of connecting convex parts 60 on the two vertical edges of the right housing 7 are respectively clamped into the two vertical right vertical grooves 26 on the right side of the shell 2, the plurality of connecting convex parts 60 on the bottom edge inner step of the right housing 7 lean against the right side surface of the shell 2, and the plurality of connecting convex parts 60 melt under the action of ultrasonic waves to weld and fixedly connect the right housing 7 with the shell 2.

The magnetic circuit mechanism 3 comprises a coil framework 31, an iron core 32, an L-shaped yoke 33 and an L-shaped armature 34, wherein the coil framework 31 is fixedly connected to the base 1 along the vertical direction, a coil 310 is arranged on the coil framework 31, the iron core 32 is arranged on a middle through hole of the coil framework 31 in a penetrating way, one end of the L-shaped yoke 33 is fixedly connected with the lower end of the iron core 32, the connection parts of the two ends of the L-shaped armature 34 are leaned against the upper end of the L-shaped armature 34, the outer side of the L-shaped yoke 33 is fixedly connected with the lower end of a pressing spring 35, one end of the L-shaped armature 34 is pressed by the upper end of the pressing spring 35 so that one end of the L-shaped armature 34 leans against the L-shaped yoke 33, two coil leading-out pins 311 extend out from the lower surface of the base 1, when the coil 310 is powered, the other end of the L-shaped armature 34 is attracted with the other end of the iron core 32, and when the coil 310 is powered off, the other end of the L-shaped armature 34 is separated from the other end of the iron core 32;

the driving mechanism 4 includes a pushing member 41, where the pushing member 41 includes a body 410, a connecting portion 411 connected to one end of the L-shaped armature 34 is provided on one side of the body 410, two parallel pushing portions 412 are provided on the other side of the body 410, and when the other end of the L-shaped armature 34 is attracted to the other end of the iron core 32, the two pushing portions 412 respectively push the two movable contacts 512 on the two movable springs 52 and the two stationary contacts 511 on the two stationary springs 51 to be attracted; when the other end of the L-shaped armature 34 is separated from the other end of the iron core 32, the two movable springs 52 are reset, and the two movable contacts 512 are separated from the two stationary contacts 511.

Two supporting plates 9 are arranged on the base 1 side by side, one end of each movable reed 52 leans against one supporting plate 9 when being reset, a guide through hole 91 is further formed in each supporting plate 9, and each pushing part 412 penetrates through one guide through hole 91. The reciprocating precision of the pushing part 412 can be further improved by the guiding action of the guiding through hole 91, and the reliability of driving the movable reed 52 is improved; in addition, by the supporting action of the two supporting pieces 9, the movable reed 52 can be prevented from tilting backward and deforming with the pushing point as a fulcrum when falling, and the gap between the movable contact 521 and the stationary contact 511 is more stable during operation.

The arc extinguishing principle of this embodiment is as follows: as shown in fig. 7, the magnetic field B formed by overlapping the two magnetic steels 9 is perpendicular to the current direction when the movable contact 521 and the stationary contact 511 are in contact, when the movable contact 521 and the stationary contact 511 are disconnected to generate an arc, the arc current I generates a force F under the action of the magnetic field B due to the fact that the current direction is identical when the arc current contacts the movable contact 521 and the stationary contact 511 at this time, and the force F stretches the arc upwards to quickly extinguish the arc.

As shown in fig. 8 to 13, an electromagnetic relay having an arc extinguishing function is different from the first embodiment in that: the inverted U-shaped support member 10 is made of magnetic conductive materials, for example, iron sheets are adopted for stamping, the upper end face, close to the contact mechanism 5, of the shell 2 is recessed downwards to form a yielding groove 2a, the left cover shell 6 and the right cover shell 7 are approximately square, the upper end of the left cover shell 6 is provided with a left opening 6a, the upper end of the right cover shell 7 is provided with a right opening 7a, the inverted U-shaped support member 10 comprises two parallel support arms 101 and a middle support arm 102 for connecting the two support arms 101, the inner side face 102a of the middle support arm 102 is abutted against the bottom face of the yielding groove 2a, the two parallel support arms 101 are respectively inserted into the left cover shell 6 and the right cover shell 7, the inner sides of the two support arms 101 are respectively connected with one magnetic steel 8, the two magnetic steels 8 are also oppositely arranged left and right, and the polarities of the opposite faces of the two magnetic steels 8 are opposite.

The outer sides of the two support arms 101 are respectively provided with a clamping protrusion 101a, the left housing 6 and the right housing 7 are respectively provided with a clamping matching hole 70, and each clamping protrusion 101a is matched with one clamping matching hole 70.

An upper positioning convex part 2b is arranged on one side of the abdication groove 2a, a positioning groove 102b is arranged on one side of the middle supporting arm 102, and the positioning groove 102b on one side of the middle supporting arm 102 is matched with the upper positioning convex part 2 b.

A supporting convex part 101b is inwardly extended on one side of each support arm 101 close to the base 1, a matching groove 81 is formed on one side of each magnetic steel 8 close to the base 1, and the matching groove 81 is matched with the supporting convex part 101 b.

The inner side surface of the middle supporting arm 102 is provided with a plurality of limiting convex parts near each supporting arm 101, and the limiting convex parts limit the upper side of the magnetic steel 8. The gap between the inner side surface of the middle supporting arm 102 and the magnetic steel 8 is enlarged, the air magnetic resistance is increased, and the magnetic force lines from the N pole to the S pole are prevented from being lost.

The left side of the shell 2 is provided with two left vertical grooves 25 and a left transverse groove 251 connected with the lower ends of the two left vertical grooves 25, a plurality of connecting protrusions 2c are distributed on the two left vertical grooves 25 and the left transverse groove 251, the connecting protrusions 2c are in a polygonal pyramid shape, and the plurality of connecting protrusions 2c butt joint two vertical edges and one bottom edge of the left housing 6 and fixedly connect the left housing 6 and the shell 2 together by welding under the action of ultrasonic wave; the right side of casing 2 is equipped with two right vertical grooves 26 and connects two right vertical grooves 26 lower extreme right transverse groove, and two right vertical grooves 26 and right transverse groove are last to be distributed a plurality of connection protruding 2c, and a plurality of connection protruding 2c butt joint two vertical sides and a base of right housing 7 and melt through the ultrasonic action right housing 7 with casing 2 welding links firmly together.

The magnetic circuit mechanism 3, the driving mechanism 4 and the contact mechanism 5 mounted on the base 1 of the embodiment are the same as those of the first embodiment, the base 1 and the housing 2 are made of plastic by injection molding, the two magnetic steels 8 are also opposite left and right, and the polarities of the opposite surfaces of the two magnetic steels 8 are opposite.

The arc extinguishing principle of the embodiment is basically the same as that of the first embodiment, except that the magnetic conductive inverted U-shaped support piece 10 is additionally arranged to be connected with the two magnetic steels 8, so that the magnetic flux loss between the two magnetic steels 8 is reduced, the magnetic flux density of the opening and closing positions of the contacts is improved, the magnetic field intensity is enhanced, and the arc extinguishing effect is better.

As shown in fig. 14 to 18, an electromagnetic relay having an arc extinguishing function according to the third embodiment is different from the first embodiment in that: the U-shaped support member 10 is made of magnetic conductive materials, for example, iron sheets are adopted for stamping, a clamping groove 2e is formed in one side, close to the contact mechanism 5, of the shell 2, the clamping groove 2e extends from the upper end face of the shell 2 to one side of the base 1, the U-shaped support member 10 comprises two parallel support arms 101 and a middle support arm 102 for connecting the two support arms 101, the middle support arm 102 is clamped into the clamping groove 2e from top to bottom and supported on the shell 2, the two parallel support arms 101 are respectively positioned in the left housing 6 and the right housing 7, and the inner side faces of the two support arms 101 are respectively connected with one magnetic steel 8. The clamping entrance of the clamping groove 2e is also provided with two guide inclined planes 21e which are convenient for clamping the middle supporting arm 102.

Each support arm 101 is close to one side of the base 1 and is provided with a lower clamping protrusion 101a, one side of each support arm 101, which is far away from the base 1, is provided with an upper clamping protrusion 101b, the upper side surfaces of the left cover shell 6 and the right cover shell 7 are respectively provided with an upper clamping hole 60, the lower side surfaces of the left cover shell 6 and the right cover shell 7 are respectively provided with a lower clamping hole 70, the upper clamping holes 60 on the left cover shell 6 and the right cover shell 7 are respectively matched with the upper clamping protrusions 101b on one support arm 101, and the lower clamping holes 70 on the left cover shell 6 and the right cover shell 7 are respectively matched with the lower clamping protrusions 101a on one support arm 101.

The left side wall and the right side wall of the shell 2 are respectively provided with a clamping hole 2f near the bottom of the clamping groove 2e, the middle part of the middle supporting arm 102 extends to one side to form a clamping part 103, the outer sides of the two ends of the clamping part 103 are respectively provided with a clamping hook 103a, the clamping hook 103a is also provided with a guide inclined plane, and the two sides of the middle supporting arm 102 near the clamping part 103 are also provided with two abdicating grooves 103b which can be respectively clamped into the left side wall and the right side wall of the shell 2; when the middle support arm 102 is clamped into the clamping groove 2e from top to bottom and supported on the shell 2, each clamping hook 103a is clamped into one clamping hole 2f.

A supporting convex part 101c is inwardly extended on one side of each support arm 101 close to the base 1, a matching groove 81 is formed on one side of each magnetic steel 8 close to the base 1, and the matching groove 81 is matched with the supporting convex part 101 c.

The inner side surface of the middle supporting arm 102 is provided with two cylindrical limit convex parts 104 near each supporting arm 101, and the two limit convex parts 104 limit one side of the magnetic steel 8. Through the limiting action of the limiting convex parts 104, the inner side surface of the middle supporting arm 102 is prevented from being in direct contact with the side surface of the magnetic steel 8, the gap between the inner side surface of the middle supporting arm 102 and the magnetic steel 8 is enlarged, the air magnetic resistance is increased, and the magnetic force lines from N pole to S pole are prevented from being lost.

The left and right housings 6 and 7 of this example do not need to be fastened to the left and right sides of the housing 2 by ultrasonic welding, and the left and right housings 6 and 7 form an indirect fastening to the housing 2 by fastening two arms 101.

The magnetic circuit mechanism 3, the driving mechanism 4 and the contact mechanism 5 mounted on the base 1 of the embodiment are the same as those of the first embodiment, the base 1 and the housing 2 are made of plastic by injection molding, the two magnetic steels 8 are also opposite left and right, and the polarities of the opposite surfaces of the two magnetic steels 8 are opposite.

The arc extinguishing principle of this embodiment is as follows: as shown in fig. 19, the magnetic field B formed by overlapping the two magnetic steels 9 is perpendicular to the current direction when the movable contact 521 and the stationary contact 511 are in contact, when the movable contact 521 and the stationary contact 511 are disconnected to generate an arc, the arc current I generates an upward force F under the action of the magnetic field B due to the fact that the current direction is identical when the arc current contacts the movable contact 521 and the stationary contact 511 at this time, and the force F stretches the arc upward to quickly extinguish the arc. In the embodiment, the two magnetic steels 8 are connected by the additionally arranged magnetic conductive U-shaped support piece 10, so that the magnetic flux loss between the two magnetic steels 8 is reduced, the magnetic flux density of the opening and closing positions of the contacts is improved, the magnetic field intensity is enhanced, and the arc extinguishing effect is better than that of the first embodiment.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (17)

1. The utility model provides an electromagnetic relay with arc extinguishing function, including base, casing, magnetic circuit mechanism, actuating mechanism and contact mechanism are adorned on the base, base and casing are made by plastics, the casing is connected the base and is covered magnetic circuit mechanism, actuating mechanism and contact mechanism, contact mechanism includes the static reed and the movable reed that corresponds with it, be equipped with the static contact on the static reed, be equipped with the movable contact on the movable reed, the magnetic force that produces through magnetic circuit mechanism makes actuating mechanism action, actuating mechanism drives the movable reed action and makes movable contact and static contact joint or break away from mutually, its characterized in that: the device also comprises at least one housing, wherein magnetic steel is arranged in the housing; the housing is arranged outside the shell, is close to the contact mechanism and is connected with the shell; the magnetic pole direction of the magnetic steel is perpendicular to the current direction when the movable contact and the stationary contact are contacted.

2. The electromagnetic relay with an arc extinguishing function according to claim 1, wherein: the housing is connected with the outer surface of the shell in a welding or clamping or bonding mode.

3. The electromagnetic relay with an arc extinguishing function according to claim 1, wherein: the device comprises a contact mechanism, a shell, a contact mechanism, a movable contact, a fixed contact, a magnetic steel, a left shell and a right shell, wherein the left shell and the right shell are respectively provided with the magnetic steel, the left shell is arranged on the left side of the shell, which is close to the contact mechanism, and is connected with the shell, the right shell is arranged on the right side of the shell, which is close to the contact mechanism, and is connected with the shell, the magnetic pole direction of each magnetic steel is perpendicular to the current direction when the movable contact and the fixed contact are contacted, the two magnetic steels are oppositely arranged left and right, and the polarities of the opposite surfaces of the two magnetic steels are opposite.

4. An electromagnetic relay with an arc extinguishing function according to claim 3, characterized in that: the upper end surface of the left housing extends to one side of the shell, a left positioning groove is formed in the left positioning part, a left concave area is formed in the upper end surface of the shell, close to the left side, a left positioning convex part is formed in the left concave area, and the left positioning convex part is matched with the left positioning groove; the upper end face of the right housing extends to one side of the shell, a right positioning portion is arranged on the right positioning portion, a right concave area is arranged on the upper end face of the shell close to the right side, a right positioning convex portion is arranged on the right concave area, and the right positioning convex portion is matched with the right positioning groove.

5. An electromagnetic relay with an arc extinguishing function according to claim 3, characterized in that: the inner bottoms of the left housing and the right housing are respectively provided with a positioning protrusion, the bottoms of the magnetic steels are provided with matching grooves, and the matching grooves of the magnetic steels are matched with the positioning protrusions.

6. An electromagnetic relay with an arc extinguishing function according to claim 3, characterized in that: the left cover shell and the right cover shell are approximately square, two left vertical grooves are formed in the left side of the shell, two right vertical grooves are formed in the right side of the shell, a plurality of protruding connecting convex parts are respectively formed in two vertical edges of the left cover shell, which are connected with the shell, the connecting bottom edge of the left cover shell and the shell are contracted inwards to form an inner step, a plurality of connecting convex parts are also formed in the inner step, the plurality of connecting convex parts on the two vertical edges of the left cover shell are respectively clamped into the two left vertical grooves in the left side of the shell, the plurality of connecting convex parts on the inner step of the bottom edge of the left cover shell lean against the left side of the shell, and the left cover shell and the shell are welded and fixedly connected together through ultrasonic melting; the right housing and the shell are connected with the bottom edge part and shrink inwards to form an inner step, a plurality of connecting convex parts are also arranged on the inner step, the connecting convex parts on the two vertical edges of the right housing are respectively clamped into the two vertical right vertical grooves on the right side of the shell, the connecting convex parts on the inner step of the bottom edge of the right housing lean against the right side surface of the shell, and the connecting convex parts melt through the action of ultrasonic waves to weld and fixedly connect the right housing with the shell.

7. An electromagnetic relay with an arc extinguishing function according to claim 3, characterized in that: the novel magnetic steel magnetic switch is characterized by further comprising an inverted U-shaped supporting piece, the inverted U-shaped supporting piece is made of magnetic conductive materials, the upper end face of the shell, which is close to the contact mechanism, is sunken downwards to form a yielding groove, the left cover shell and the right cover shell are approximately square, the upper end of the left cover shell is provided with a left opening, the upper end of the right cover shell is provided with a right opening, the inverted U-shaped supporting piece comprises two parallel support arms and a middle support arm connected with the two support arms, the inner side face of the middle support arm leans against the bottom face of the yielding groove, the two parallel support arms are respectively inserted into the left cover shell and the right cover shell, and the inner sides of the two support arms are respectively connected with magnetic steel.

8. The electromagnetic relay with an arc extinguishing function according to claim 7, wherein: two the support arm outsides all are equipped with the joint arch, all be equipped with the joint mating hole on left housing and the right housing, every the joint arch with one the joint mating hole cooperatees.

9. The electromagnetic relay with an arc extinguishing function according to claim 7, wherein: the upper positioning convex part is arranged on one side of the abdication groove, the positioning groove is arranged on one side of the middle supporting arm, and the positioning groove on one side of the middle supporting arm is matched with the upper positioning convex part.

10. The electromagnetic relay with an arc extinguishing function according to claim 7, wherein: a supporting convex part is inwards extended from one side of each support arm close to the base, and a matching groove is formed in one side of each magnetic steel close to the base and matched with the supporting convex part; the inner side surface of the middle supporting arm is provided with a plurality of limiting convex parts close to each supporting arm, and the limiting convex parts limit one side of the magnetic steel.

11. The electromagnetic relay with an arc extinguishing function according to claim 7, wherein: the left side of the shell is provided with two left vertical grooves and a left transverse groove connected with the lower ends of the two left vertical grooves, a plurality of connecting bulges are distributed on the two left vertical grooves and the left transverse groove, and the plurality of connecting bulges butt-joint the two vertical edges and one bottom edge of the left shell and fixedly connect the left shell and the shell together by welding under the action of ultrasonic waves; the right side of casing is equipped with two right vertical grooves and connects two right vertical grooves lower extreme right transverse groove, and two right vertical grooves and right transverse groove are last to be distributed has a plurality of connection protruding, and a plurality of connection protruding butt joints two vertical limits and a base of right housing are melted through the ultrasonic wave effect right housing with the casing welding links firmly together.

12. An electromagnetic relay with an arc extinguishing function according to claim 3, characterized in that: the U-shaped support piece is made of magnetic conductive materials, a clamping groove is formed in one side, close to the contact mechanism, of the shell, the clamping groove extends from the upper end face of the shell to one side of the base, the left cover shell and the right cover shell are approximately square, the U-shaped support piece comprises two parallel support arms and a middle support arm connected with the two support arms, the middle support arm is clamped into the clamping groove from top to bottom and supported on the shell, the two parallel support arms are respectively located in the left cover shell and the right cover shell, and the inner side faces of the two support arms are respectively connected with magnetic steel.

13. The electromagnetic relay with an arc extinguishing function according to claim 12, wherein: each support arm is close to one side of the base and is provided with a lower clamping bulge, each support arm is far away from one side of the base and is provided with an upper clamping bulge, the upper side faces of the left cover shell and the right cover shell are respectively provided with an upper clamping hole, the lower side faces of the left cover shell and the right cover shell are respectively provided with a lower clamping hole, the upper clamping holes on the left cover shell and the right cover shell are respectively matched with the upper clamping bulge on one support arm, and the lower clamping holes on the left cover shell and the right cover shell are respectively matched with the lower clamping bulge on one support arm.

14. The electromagnetic relay with an arc extinguishing function according to claim 12, wherein: the left side wall and the right side wall of the shell are respectively provided with a clamping hole near the bottom of the clamping groove, the middle part of the middle supporting arm extends to one side to form a clamping part, the outer sides of the two ends of the clamping part are respectively provided with a clamping hook, and the two sides of the middle supporting arm near the clamping part are also provided with two abdicating grooves which can be respectively clamped into the left side wall and the right side wall of the shell; when the middle supporting arm is clamped into the clamping groove and supported on the shell, each clamping hook is clamped into one clamping hole.

15. The electromagnetic relay with an arc extinguishing function according to claim 12, wherein: each support arm is close to one side of the base and inwards extends to form a supporting convex part, and each magnetic steel is close to one side of the base and is provided with a matching groove which is matched with the supporting convex part.

16. The electromagnetic relay with an arc extinguishing function according to claim 12, wherein: the inner side surface of the middle supporting arm is provided with a plurality of limiting convex parts close to each supporting arm, and the limiting convex parts limit one side of the magnetic steel.

17. An electromagnetic relay having an arc extinguishing function according to any one of claims 3 to 16, characterized in that: two static reed and two movable reed are arranged on the base side by side, two static reed leading-out feet extend out from the lower surface of the base, and two movable reed leading-out feet also extend out from the lower surface of the base;

the magnetic circuit mechanism comprises a coil framework, an iron core, an L-shaped yoke iron and an L-shaped armature iron, wherein the coil framework is fixedly connected to the base along the vertical direction, a coil is arranged on the coil framework, the iron core is arranged on a middle through hole of the coil framework in a penetrating mode, one end of the L-shaped yoke iron is fixedly connected with the lower end of the iron core, the connection position of the two ends of the L-shaped armature iron is leaned against the upper end of the L-shaped armature iron, the outer side of the L-shaped yoke iron is fixedly connected with the lower end of a pressing spring, the upper end of the pressing spring presses one end of the L-shaped armature iron to enable one end of the L-shaped armature iron to lean against the L-shaped yoke iron, when the coil is powered, the other end of the L-shaped armature iron is attracted with the other end of the iron core, and when the coil is powered off, the other end of the L-shaped armature iron is separated from the other end of the iron core;

the driving mechanism comprises a pushing piece, wherein the pushing piece comprises a body, one side of the body is provided with a connecting part connected with one end of an L-shaped armature, the other side of the body is provided with two parallel pushing parts, and when the other end of the L-shaped armature is attracted with the other end of the iron core, the two pushing parts respectively push two movable contacts on the two movable reeds and two static contacts on the two static reeds to be attracted; when the other end of the L-shaped armature is separated from the other end of the iron core, the two movable springs are reset, and the two movable contacts are separated from the two stationary contacts;

two supporting plates are arranged on the base side by side, one end of each movable reed leans against one supporting plate when the movable reed resets, a guide through hole is further formed in each supporting plate, and each pushing part penetrates through one guide through hole.

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