CN214542039U - Relay with a movable contact - Google Patents

Abstract

The lower shield cover of the relay comprises an elastic connecting piece, the elastic connecting piece can absorb tolerance generated when the shell and the magnetic pole plate are welded, stable contact attachment of the upper shield cover and the shell and the lower shield cover can be guaranteed, positioning accuracy of the upper shield cover is improved, accordingly the movable contact bridge and the two static contacts can be well kept in attraction, and working stability and short circuit resistance of the relay are greatly improved.

Description

Relay with a movable contact

Technical Field

The utility model relates to an electron electric power technical field, concretely relates to relay.

Background

The conventional structure of a direct current relay in the current market comprises a shell, two static contacts, a movable contact bridge and a driving mechanism, wherein the two static contacts are installed in the shell, the movable contact bridge and the two static contacts are vertically and oppositely arranged, the driving mechanism is provided with a sleeve, a static iron core, a movable iron core, a push rod group and a counter-force spring, the sleeve is arranged below the shell, the movable iron core is movably arranged in the sleeve, the static iron core is fixed above the movable iron core, a gap is formed between the static iron core and the movable iron core, the push rod group is vertically arranged, the lower end of the push rod group is tightly penetrated in the movable iron core in a matching manner, the upper part of the push rod group is connected with the movable contact bridge, and the upper part of the push rod group is further sleeved with a contact spring which is positioned below the movable contact bridge and used for supporting the movable contact bridge and a stop sheet which is positioned above the movable contact bridge and used for stopping the movable contact bridge; the counter-force spring is sleeved outside the lower part of the push rod. When the sleeve is electrified, a magnetic field is generated, a magnetic potential difference is generated between the movable iron core and the static iron core, the movable iron core moves upwards, and then the movable contact bridge is driven to move upwards, so that the movable contact bridge is respectively attracted and communicated with the two static contacts.

When the movable contact bridge is respectively attracted, communicated and electrified with the two static contacts, as the contact flow guide channel of the movable contact bridge and the two static contacts is very small, an electric repulsion force can be formed, the larger the electrified current is, the larger the electric repulsion force borne by the movable contact bridge is, and thus, the contact pressure can be reduced, and even the movable contact bridge and the static contacts can be flicked. At present, the movable contact bridge and two fixed contacts are ensured to be attracted by enhancing the spring force value of a contact spring. However, the force value of the contact spring is too strong, which will affect the operations of the driving mechanism such as reset, and reduce the stability of the relay.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a relay sets up elastic connection spare through the shield cover under, can absorb assembly tolerance for go up the shield cover respectively with the bottom surface of casing and the top surface butt of shield cover down, thereby can fine assurance movable contact bridge and two static contacts keep the actuation, promoted relay job stabilization nature and anti short circuit ability greatly.

An embodiment of the utility model provides a relay, relay includes:

the shell and the magnetic pole plate surround to form an accommodating cavity;

the upper shielding cover is arranged in the accommodating cavity, the lower end of the upper shielding cover extends outwards horizontally along the circumferential direction to form a connecting edge, and the connecting edge is positioned below the bottom surface of the shell;

the first magnetic conduction block is fixedly arranged at the top of the inner side of the upper shielding cover;

the two static contacts are fixedly connected with the shell and penetrate through the shell and the upper shielding cover;

a lower shield positioned between the connecting edge and the pole plate;

the movable contact bridge is positioned below the two fixed contacts and between the lower shielding case, and the two movable contacts of the movable contact bridge correspond to the two fixed contacts;

the top of the pushing component is connected with the movable contact bridge to push the two movable contacts of the movable contact bridge to be connected with or disconnected from the two fixed contacts;

the second magnetic conduction block is fixedly connected with the movable contact bridge and is arranged opposite to the first magnetic conduction block, and the first magnetic conduction block and the second magnetic conduction block form a magnetic conduction loop so that the second magnetic conduction block drives the movable contact bridge to move upwards;

the lower shielding cover comprises an elastic connecting piece extending to the outer side of the bottom surface of the lower shielding cover, and the connecting edge of the upper shielding cover is connected with the bottom surface of the shell and the top surface of the lower shielding cover in an abutting mode through the elastic force of the elastic connecting piece.

Furthermore, the elastic connecting piece comprises a connecting plate and two elastic side walls arranged on two sides of the connecting plate, the connecting plate is connected with the bottom surface of the lower shielding case, and the two elastic side walls extend towards the outer side of the lower shielding case.

Further, the two elastic side walls are simultaneously bent inwards or outwards relative to the connecting plate.

Further, the bottom surface of the lower shielding cover is upwards sunken to form at least two grooves;

the lower shielding case comprises elastic connecting pieces in one-to-one correspondence with the grooves, the connecting plates of the elastic connecting pieces are connected with the bottoms of the grooves, and the elastic side walls extend to the outer side of the lower shielding case.

Furthermore, shield cover includes two at least logical grooves and with lead to the elastic connection spare that the groove one-to-one is connected, elastic connection spare's both ends have two and extend to the protruding portion in the shield cover bottom surface outside down, the protruding portion is controlled to drive elastic connection spare to lead to the inboard removal in groove.

Further, elastic connection spare includes cross connecting arm and two the protruding portion, the relative two short lateral walls of cross connecting arm with the both sides fixed connection who leads to the groove, two the protruding portion is fixed the both ends of the relative two long lateral walls of cross connecting arm just extend to the outside of shield cover down, the length sum of the relative two long lateral walls of cross connecting arm is less than the length that leads to the groove.

Furthermore, the elastic connecting piece is a spring, and the spring is fixedly connected with the bottom surface of the lower shielding case.

Furthermore, the top surface of the lower shielding cover is provided with an annular protrusion in an upward protruding manner, the annular protrusion extends into the upper shielding cover, and the connecting edge is located on the outer side of the annular protrusion and attached to the top surface of the lower shielding cover.

Furthermore, two connecting columns are convexly arranged on the inner side of the top of the upper shielding cover, the two static contacts respectively penetrate through the shell and the corresponding connecting columns, and the first magnetic conduction blocks are fixed between the two connecting columns and distributed above the movable contact bridge along the width of the movable contact bridge.

Furthermore, the upper shielding cover comprises a plurality of arc extinguishing windows, the arc extinguishing windows are respectively arranged around the upper shielding cover, and the arc extinguishing windows are arranged opposite to the moving contact and the static contact.

Further, the relay further comprises a connecting ring, and the lower shielding cover is located on the inner side of the connecting ring;

the upper part of the magnetic pole plate is convexly provided with an annular convex rib, and the shell is connected with the magnetic pole plate through the connecting ring and the convex rib.

Furthermore, two sides of the width of the movable contact bridge are inwards sunken to form gaps;

the second magnetic conduction block is of a U-shaped structure and is located below the movable contact bridge, and the two side walls of the second magnetic conduction block penetrate through the notches on the two sides of the movable contact bridge and extend towards the first magnetic conduction block.

Further, the pushing assembly includes:

the fixed support is positioned below the movable contact bridge;

the stop plate comprises a bearing plate and two fixed side arms, the two fixed side arms are arranged on two sides of the bearing plate along the width direction of the movable contact bridge, the bearing plate is buckled on the top surface of the movable contact bridge, and the two fixed side arms respectively extend to two sides of the fixed support and are fixedly connected with the fixed support;

the first elastic piece is arranged between the two fixed side arms, one end of the first elastic piece is connected with the fixed support, and the other end of the first elastic piece is connected with the movable contact bridge;

the push rod penetrates through the magnetic pole plate and the lower shielding cover and is movably connected with the magnetic pole plate and the lower shielding cover, and the top of the push rod is connected with one surface of the fixed support, which faces back to the first elastic piece.

Furthermore, the bearing plate is provided with two openings, two side walls of the second magnetic conduction block respectively penetrate through the corresponding openings, and end surfaces of two side walls of the second magnetic conduction block are higher than a plane where the bearing plate is located.

Further, the relay further includes:

the sleeve is positioned below the magnetic pole plate and is fixedly connected with the magnetic pole plate;

the static iron core is positioned in the sleeve and the magnetic pole plate and is fixedly connected with the sleeve and the magnetic pole plate;

the movable iron core is movably arranged in the sleeve and is positioned below the static iron core;

the two ends of the second elastic piece are respectively connected with the static iron core and the movable iron core;

the pushing rod penetrates through the static iron core and the second elastic piece and penetrates into the movable iron core, the pushing rod is movably connected with the static iron core, and the pushing rod is fixedly connected with the movable iron core.

The relay of this embodiment makes lower shield cover include elastic connection spare through setting up, and elastic connection spare can absorb the tolerance when casing and magnetic pole plate welding, can guarantee to go up shield cover and casing and the stable contact laminating of shield cover down, improves the positioning accuracy of shield cover to can fine guarantee that the movable contact bridge keeps the actuation with two static contacts, promoted relay job stabilization nature and anti short circuit ability greatly.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a cross-sectional view of a relay according to an embodiment of the present invention;

fig. 2 is another angular cross-sectional view of a relay according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of the pushing assembly and the movable contact bridge according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a part of the pushing assembly and the movable contact bridge according to the embodiment of the present invention;

fig. 5 is a schematic structural diagram of the stopper plate, the movable contact bridge, and the second magnetic conductive block according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of another angle of the stopper plate, the movable contact bridge, and the second magnetic conductive block according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of the movable contact bridge and the second magnetic conductive block according to the embodiment of the present invention;

fig. 8 is a schematic structural view of a magnetic pole plate according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a second magnetic conductive block according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an upper shield according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a lower shield according to an embodiment of the present invention;

fig. 12 is another angle structure diagram of the lower shielding case according to the embodiment of the present invention;

fig. 13 is a further schematic structural view of the lower shield according to the embodiment of the present invention;

fig. 14 is another schematic structural view of the lower shield according to the embodiment of the present invention;

fig. 15 is another angle structure diagram of the movable contact bridge and the second magnetic conductive block according to the embodiment of the present invention;

fig. 16 is a schematic structural view of a second magnetic conductive block according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a stopper plate according to an embodiment of the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in detail. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1 to fig. 2 are schematic structural diagrams of the relay according to the present embodiment. As shown in fig. 1 and 2, the relay includes a housing 1, a magnetic pole plate 2, an upper shield 3, a first magnetic conductive block 4, two stationary contacts 5, a lower shield 6, a movable contact bridge 7, a pushing assembly 8, and a second magnetic conductive block 9. Wherein, the housing 1 and the magnetic pole plate 2 surround to form a containing cavity. The upper shield cover 3, the first magnetic conduction block 4, the two fixed contacts 5, the lower shield cover 6, the movable contact bridge 7 and the second magnetic conduction block 9 are arranged in a containing cavity formed by the enclosure 1 and the magnetic pole plate 2.

Specifically, the housing 1 has an accommodating space with a downward opening, and the magnetic pole plate 2 closes the opening of the accommodating space to form a closed accommodating cavity. The shape of the shell 1 and the accommodating space in the shell can be of a columnar structure with a rectangular, circular, oval or polygonal cross section, and the shape can be set according to actual product requirements. The shell 1 can be made of high-temperature-resistant and insulating materials such as ceramics, electric arcs generated by the relay can be extinguished more conveniently, and the service life and the use safety factor of the relay are improved.

The relay further comprises a connecting ring 10, as shown in fig. 1 and 2. The coupling ring 10 includes a vertical portion integrally formed with the bottom of the housing 1 and an edge portion extending outward of the housing 1 along the vertical portion. The vertical part is an annular structure with the same shape as the housing 1 and the accommodating space. The shell 1 is fixedly connected with the magnetic pole plate 2 through the connecting ring 10, and the air tightness of the relay can be guaranteed. A certain distance exists between the vertical part of the connecting ring 10 and the inner wall of the accommodating space, so that the positions of the upper shielding case 3 and the lower shielding case 6 in the accommodating cavity are limited. The connection ring 10 may be formed of kovar (also called iron-nickel-cobalt alloy), SPCC (cold rolled carbon steel sheet and steel strip), copper and copper alloy, or stainless steel, and the like, and is used for welding with the magnetic pole plate 2. In the present embodiment, the housing 1 and the coupling ring 10 are integrally formed by an injection molding process, an insert molding process, or the like.

The magnetic pole plate 2 is arranged below the connecting ring 10 and welded with the edge part of the connecting ring 10 to form a containing cavity. Specifically, an annular rib 21 is protruded above the magnetic pole plate 2, as shown in fig. 8. The annular rib 21 is located at a position on the magnetic pole plate 2 facing the middle of the edge of the connecting ring 10. When the magnetic pole plate 2 is connected to the connection ring 10, the annular rib 21 is melted to fixedly connect the two.

The upper shield 3 is disposed in the receiving cavity, as shown in fig. 1 and 2. The upper shield 3 has a receiving cavity with a downward opening, and the lower end of the upper shield 3 is formed with a connecting edge 31 extending horizontally outward in the circumferential direction, as shown in fig. 10. The outer annular dimension of the connecting edge 31 is larger than the dimension of the accommodating cavity and smaller than the annular dimension of the vertical part of the connecting ring 10, so that the connecting edge 31 is located below the bottom of the housing 1 and limited by the bottom of the housing 1.

The two static contacts 5 respectively penetrate through the housing 1 and the upper shielding case 3 in sequence, and the outer sides of the static contacts 5 are fixed and hermetically connected with the housing 1, as shown in fig. 1 and 2. Preferably, the two stationary contacts 5 are symmetrically arranged on the housing 1 and the upper shield 3.

Specifically, the top of the housing 1 has two symmetrical first through holes, the top of the upper shielding case 3 has two second through holes respectively communicated with the first through holes, and the two stationary contacts 5 respectively sequentially penetrate through the first through holes and the second through holes to enter the accommodating cavity of the upper shielding case 3. Furthermore, two connecting posts 32 are convexly arranged on the inner side of the top of the upper shielding case 3, and two second through holes penetrate through the connecting posts 32. The connecting column 32 is used for increasing the creepage distance between the two static contacts 5, and meanwhile, ash generated after the static contacts 2 are evaporated can be well prevented from falling on the inner surface of the shell 1, so that the voltage resistance and the insulating property of a relay product are improved. Preferably, a cylinder is convexly arranged on the outer side of the top of the housing 1, cylinders are convexly arranged on the inner side and the outer side of the top of the upper shielding case 3, the first through hole penetrates through the cylinder on the housing 1, and the second through hole penetrates through the cylinder on the upper shielding case 3, so that the function is the same as that of the first through hole.

The lower shield 6 is located between the upper shield 3 and the magnetic pole plate 2 and inside the connecting ring 10, that is, the lower shield 6 is located in the receiving cavity, as shown in fig. 1 and 2. The movable contact bridge 7, the pushing assembly 8 and the second magnetic conduction block 9 are all located between the upper shielding case 3 and the lower shielding case 6 and are all located below the two static contacts 5.

Specifically, the moving contact bridge 7 is disposed on the top of the pushing assembly 8, and two moving contacts at two ends of the moving contact bridge 7 correspond to the two fixed contacts 5, as shown in fig. 1 to 4. The pushing assembly 8 is used for pushing the movable contact bridge 7 to move so that the two movable contacts are connected with or disconnected from the two fixed contacts 5. In the present embodiment, the upper shield case 3 includes a plurality of arc extinguishing windows 33, as shown in fig. 10. The plurality of arc extinguishing windows 33 are respectively arranged on the upper shielding case 3 at positions corresponding to the moving contacts and the static contacts on the two sides of the width and the two sides of the length of the moving contact bridge 7. The arc extinguishing window 33 can make the arc generated by the disconnection of the moving contact and the fixed contact elongate on the surface of the shell 1 and the surface of the upper shielding case 3, which is more beneficial to extinguishing the arc.

The second magnetic conduction block 9 is fixedly connected with the movable contact bridge 7, and the second magnetic conduction block 9 is located between two movable contacts of the movable contact bridge 7, as shown in fig. 3-7. The first magnetic conductive block 4 is fixedly arranged at the top of the inner side of the upper shielding case 3, and the first magnetic conductive block 4 is fixed between the two connecting posts 32 (i.e. between the two fixed contacts 5) and arranged opposite to the second magnetic conductive block 9. After the pushing assembly 8 pushes the movable contact to be communicated with the fixed contact 5, the second magnetic conduction block 9 is close to the first magnetic conduction block 4, at the moment, an external circuit is conducted, the movable contact and the fixed contact can generate an annular magnetic field around the movable contact bridge 7 through a large current, the annular magnetic field forms a closed magnetic conduction loop through the first magnetic conduction block 4 and the second magnetic conduction block 9, a mutual attraction force is generated between the first magnetic conduction block 4 and the second magnetic conduction block 9, the second magnetic conduction block 9 drives the movable contact bridge 7 to be attracted upwards, so that the two movable contacts of the movable contact bridge 7 are in more stable contact with the two fixed contacts 5, and the working stability and the short circuit resistance of the relay are greatly improved. The first magnetic conduction block 4 and the second magnetic conduction block 9 can be made of iron, cobalt, nickel, alloys thereof and other materials.

Further, in order to adjust the distance between the first magnetic conduction block 4 and the second magnetic conduction block 9, so that the distance between the first magnetic conduction block 4 and the second magnetic conduction block 9 can meet the working requirement, a protrusion can be selectively and convexly arranged between the two connecting posts 32 on the upper shielding cover 3, and the first magnetic conduction block 4 can be arranged on the protrusion. The working requirement means that when the moving contact is abutted with the static contact, the first magnetic conduction block 4 and the second magnetic conduction block 9 can be infinitely close to or abutted with each other, and a magnetic conduction loop is formed when a large current is conducted; when the moving contact and the static contact are separated, the first magnetic conduction block 4 and the second magnetic conduction block 9 are separated. The fixing mode between the first magnetic conduction block 4 and the upper shielding case 3 can be injection molding, gluing, buckling, hot melting, riveting and the like.

In this embodiment, the movable contact bridge 7 has a strip-shaped plate-like structure, as shown in fig. 9. Two ends of the movable contact bridge 7 are respectively arranged towards the two static contacts 5. Two sides of the width of the movable contact bridge 7 are recessed inwards to form two gaps 71, and the width is perpendicular to the two movable contact connecting lines, as shown in fig. 9. The second magnetic conduction block 9 is of a U-shaped structure, as shown in fig. 16. The second magnetic conduction block 9 is located below the movable contact bridge 7, and two side walls of the second magnetic conduction block 9 respectively penetrate through the notches 71 on two sides of the movable contact bridge 7 and extend towards the first magnetic conduction block 4, as shown in fig. 15. Two side walls of the second magnetic conduction block 9 extend to the top part higher than the movable contact bridge 7 and are arranged opposite to the first magnetic conduction block 4.

Further, the bottom of the second magnetic conduction block 9 extends to the two moving contacts of the moving contact bridge 7 along the length direction, and two extending sides are respectively provided with a fixing hole. And two fixed columns are convexly arranged on the bottom surface of the movable contact bridge 7. The movable contact bridge 7 and the second magnetic conduction block 9 are inserted into the fixing hole through the fixing column to be fixedly connected. In other modes, the bottom surface of the movable contact bridge 7 is provided with two fixing holes with downward openings, and the bottom of the second magnetic conduction block 9 is provided with two fixing columns which are fixedly connected with the two fixing holes of the movable contact bridge 7 in an upward protruding mode. In addition, the movable contact bridge 7 and the second magnetic conduction block 9 can be fixedly connected through a fastener, welded, fixed and the like.

In a preferred embodiment, the gap 71 is located in the middle of two moving contacts of the moving contact bridge 7, so that the second magnetic conductive block 9 is fixed in the middle of the moving contact bridge 7. Correspondingly, the first magnetic conduction block 4 is arranged right above the second magnetic conduction block 9. Above-mentioned mode of setting up can make the suction that second magnetic conduction piece 9 produced can drive the both sides of moving contact bridge 7 rebound simultaneously, avoids taking place the slope, simultaneously can also the size of furthest reduction relay, adapts to different space demands.

The pushing assembly 8 is located below the movable contact bridge 7 and connected with the movable contact bridge 7 and used for pushing the movable contact bridge 7 to move up and down. Specifically, the pushing assembly 8 includes a fixed bracket 81, a stopper plate 82, a first elastic member 83, and a pushing rod 84, as shown in fig. 1 to 3. The fixed bracket 81 is located between the movable contact bridge 7 and the lower shield 6. The pushing rod 84 is located below the fixing bracket 81, one end of the pushing rod 84 is fixedly connected with the fixing bracket 81, and the other end of the pushing rod 84 penetrates through the lower shielding case 6 and the magnetic pole plate 2, as shown in fig. 1 and 2. The pushing rod 84 is movably connected with the magnetic pole plate 2 and the lower shielding case 6 and used for pushing the fixing support 81 to move up and down.

In this embodiment, the second magnetic block 9 has an exit hole at the middle of the bottom. The first elastic member 83 is located above the fixed bracket 81, and has one end fixedly connected to the fixed bracket 81 and the other end fixedly connected to the bottom of the movable contact bridge 7 through the through hole, as shown in fig. 1 and 2. In other embodiments, the bottom of the second magnetic conductive block 9 may not be provided with a through hole, and one end of the first elastic member 83 is fixedly connected to the fixing bracket 81, and the other end is fixedly connected to the bottom of the second magnetic conductive block 9.

The stop plate 82 includes a receiving plate 821 and two fixed side arms 822 as shown in fig. 17. The two fixed side arms 822 are disposed on two sides of the receiving plate 821 in the width direction of the movable contact bridge 7. The receiving plate 821 is opened at both sides in the width direction by the opening 85. The receiving plate 821 is fastened on the top surface of the movable contact bridge 7, and two side walls of the second magnetic conduction block 9 respectively penetrate through the two openings 85 and extend upward, as shown in fig. 3, 5-6. The two fixing side arms 822 are located at the outer sides of the two side walls of the second magnetic conduction block 9, respectively extend to the two sides of the fixing bracket 81 and the first elastic element 83, and are fixedly connected with the fixing bracket 81, as shown in fig. 3. Preferably, the two sides of the fixing bracket 81 are respectively provided with a connecting piece, and the two fixing side arms 822 are respectively fixedly connected with the two connecting pieces. The two fixing side arms 822 limit the first elastic member 83 to prevent the first elastic member 83 from inclining outward, so as to facilitate assembly.

In one embodiment, the two fixed side arms 822 and the receiving plate 821 are integrally formed. In this way, the connection between the two fixed side arms 822 and the receiving plate 821 is firm, and the impact resistance of the stopper plate 82 is improved. The first elastic member 83 is for providing an elastic force. When the two ends of the moving contact bridge 7 contact with the two fixed contacts 5, the elastic force of the first elastic member 83 acts on the moving contact bridge 7 to maintain the abutting relationship between the moving contact bridge 7 and the fixed contacts 5.

When the push rod 84 pushes the fixed bracket 81, the stop plate 82, the first elastic element 83, the movable contact bridge 7 and the second magnetic conduction block 9 to move upward toward the fixed contact 5, the two movable contacts at the two ends of the movable contact bridge 7 are respectively abutted against the two fixed contacts 5. At this time, the second magnetic conduction block 9 abuts against or is fixed in relative position with the first magnetic conduction block 4. With the over-travel (over-travel operation), as the position of the movable contact bridge 7 is fixed at the moment, the push rod 84 continues to push the fixed support 81 to move upwards so as to compress the first elastic piece 83, and therefore the requirement of the relay on operation during the over-travel operation of the push rod 84 is met.

Because the first magnetic conduction block 4 is arranged on the inner side surface of the top of the upper shielding case 3, the position relation between the first magnetic conduction block 4 and the second magnetic conduction block 9 cannot be changed due to the continuous process of overtravel. That is to say, the magnetic air gap between the first magnetic conduction block 4 and the second magnetic conduction block 9 cannot be changed, the magnetic air gap between the first magnetic conduction block 4 and the second magnetic conduction block 9 cannot be enlarged along with the enlargement of the overtravel, the magnetic attraction between the first magnetic conduction block 4 and the second magnetic conduction block 9 cannot be influenced by the enlargement of the overtravel, the short-circuit resistance function of the relay is not influenced, and therefore the contradiction between the overtravel and the magnetic air gap is solved.

In the field of relay technology, over travel is a very important parameter. When the moving contact bridge 7 contacts with the two stationary contacts 5, the push rod 84 does not stop moving immediately, the fixed bracket 81 continues to move, and the first elastic member 83 is further compressed. When the moving contact bridge 7 is in contact with the two fixed contacts 5, the two fixed contacts 5 limit the continuous movement of the moving contact bridge 7, at this time, the moving contact bridge 7 and the second magnetic conduction block 9 will not move, the fixed bracket 81, the stop plate 82 and the push rod 84 continue to move, and after the first elastic piece 83 continues to be compressed to a certain degree, the fixed bracket 81, the stop plate 82 and the push rod 84 stop moving.

In this embodiment, end surfaces of two side walls of the second magnetic conductive block 9 are higher than a top surface of the receiving plate 821. When the overtravel proceeds, the push rod 84 firstly continues to push the fixed bracket 81 and the stop plate 82 to move upwards to press the first elastic member 83 to compress the first elastic member until the receiving plate 821 of the stop plate 82 abuts against the first magnetic conduction block 4, so that the requirement of the relay operation during the overtravel operation is met. Specifically, when the movable contact bridge 7 is just in contact with the two fixed contacts 5, the distance between the top of the first magnetic conductive block 4 and the receiving plate 821 is the maximum amplitude of the over travel in this embodiment. When the relay is closed and in a stable state, there is a gap between the receiving plate 821 and the top end portion of the first magnetic conduction block 4 to avoid the collision between the receiving plate 821 and the first magnetic conduction block 4.

The stop plate 82 is arranged to improve the stability of the upward movement of the movable contact bridge 7 and the second magnetic conduction block 9 during non-over travel. Meanwhile, the stop plate 82 and the first elastic element 83 are arranged to provide a certain over travel displacement amount during over travel. The first elastic member 83 may be made of elastic material or form such as spring, rubber, silicon rubber, memory alloy, etc. The stop plate 82 is made of a non-magnetic material or a weak magnetic material, so that the situation that the stop plate 82 cannot move continuously or is blocked due to the influence of the over-travel motion of the stop plate under the action of attraction is avoided.

In this embodiment, the fixing bracket 81 has a cylindrical structure. The fixed support 81 comprises a first cylindrical portion and a second cylindrical portion which are coaxially arranged, and the first cylindrical portion is located above the second cylindrical portion and close to the movable contact bridge 7. A groove is formed at the top of the first cylindrical portion, and one end of the first elastic member 83 is fixedly disposed in the groove. And a through hole is formed in the middle of the lower shielding case 6. The through hole is larger than the radial dimension of the second cylindrical portion and smaller than the radial dimension of the first cylindrical portion, so that the first cylindrical portion of the fixing bracket 81 can move in the height direction of the lower shield shell 6. The two connecting pieces are arranged on the radial outer side surface of the second cylindrical part. The push rod 84 is fixedly connected to the bottom of the first cylindrical portion.

In other embodiments, the bottom dimension of the fixed bracket 81 is larger than the dimension of the through hole of the lower shield 6, so that the fixed bracket 81 moves between the movable contact bridge 7 and the lower shield 6. The push rod 84 passes through the through hole and the magnetic pole plate 2 and is movably connected with the lower shielding case 6 and the magnetic pole plate 2 respectively.

Specifically, the magnetic pole plate 2 is further provided with a moving through hole. The moving through hole is located right below the fixed bracket 81 and is used for the push rod 84 to penetrate out and move. The push rod 84 is a stressed component, the push rod 84 is a cylindrical structure, and the push rod 84 pushes the fixed bracket 81 to move under the action of electromagnetic force, so that the movable contact bridge 7 moves towards the fixed contact 5.

The relay further includes a sleeve 11, a stationary core 12, a movable core 13, and a second elastic member 14, as shown in fig. 1 and 2. The sleeve 11 is located below the magnetic pole plate 2, and the connecting edge at the opening of the sleeve 11 is fixedly connected with the magnetic pole plate 2 outside the movable through hole and used for sealing the magnetic pole plate 2. The static iron core 12 is located in the sleeve 11 and the movable through hole of the magnetic pole plate 2, and the static iron core 12 is fixedly connected with the sleeve 11 and the magnetic pole plate 2. The movable iron core 13 is arranged in the sleeve 11 and positioned below the static iron core 12, and the movable iron core 13 moves between the bottom of the sleeve 11 and the static iron core 12. The second elastic element 14 is arranged in the sleeve 11, and two ends of the second elastic element 14 are respectively fixedly connected with the static iron core 12 and the movable iron core 13.

The pushing rod 84 penetrates out of the lower shielding case 6 and enters the stationary core 12, and penetrates through the stationary core 12 and the second elastic member 14 and is inserted into the movable core 13. The pushing rod 84 is movably connected with the stationary iron core 12, and the pushing rod 84 is fixedly connected with the movable iron core 13.

When the relay is used, a coil is sleeved outside the sleeve 11. The coil is energized to generate a magnetic field, the magnetic field forms a magnetic circuit through the static iron core 12 and the movable iron core 13, and the static iron core and the movable iron core generate mutually attracted electromagnetic force. Because the static iron core 12 is fixed on the sleeve 11 and the magnetic pole plate 2, the moving iron core 13 drives the pushing rod 84 to move upwards under the action of electromagnetic force, and further drives the moving contact bridge 7 and the second magnetic conduction block 9 to move upwards, so that the two moving contacts of the moving contact bridge 7 are respectively connected with the two static contacts 5 in an attraction manner. During the upward movement of the plunger 13, the plunger 13 presses the second elastic member 14, so that the second elastic member 14 is compressed. When the coil is powered off, the movable iron core 13 drives the pushing rod 84 to move downward under the action of the elastic force of the second elastic member 14, and further drives the movable contact bridge 7 and the second magnetic conductive block 9 to move downward, so that the movable contact bridge 7 is separated from the two fixed contacts 5.

The second elastic member 14 is a spring, but may have other elastic structures. The sleeve 11 may be made of stainless steel or the like.

In a preferred embodiment, a washer is further disposed between the top of the stationary core 12 and the bottom of the fixed bracket 81 for buffering noise generated by the pushing rod 84 during the movement of pushing the fixed bracket 81. Wherein, the gasket can comprise two gaskets, one stainless steel gasket and one silicon rubber gasket.

The two static contacts 5 are used for connecting an external circuit. When a coil in the relay is electrified and the two fixed contacts 5 and the movable contact bridge 7 are attracted and communicated, an external circuit is conducted, and current generates an annular magnetic field around the movable contact bridge 7 through the movable contact bridge 7. The first magnetic conduction block 4 and the second magnetic conduction block 9 are arranged in the magnetic field of the movable contact bridge 7, the first magnetic conduction block 4 and the second magnetic conduction block 9 generate a magnetic conduction loop, so that mutual attraction is generated between the first magnetic conduction block and the second magnetic conduction block, the second magnetic conduction block 9 drives the movable contact bridge 7 to be subjected to upward electromagnetic attraction, and the movable contact bridge 7 is contacted with the two fixed contacts 5 more stably. The larger the current is, the larger the magnetic field is, the larger the attraction force between the two is, the electric repulsion force formed by the contact and flow guiding of the movable contact bridge 7 and the two static contacts 5 can be counteracted, thus under the condition of passing large current (such as 6000A-10000A), the movable contact bridge 7 and the two static contacts 5 can be well ensured to be attracted, and the working stability and the short circuit resistance of the relay are greatly improved.

The lower shield 6 is located between the upper shield 3 and the pole plate 2 as shown in figures 1 and 2. The lower shield 6 is used for supporting and positioning the upper shield 3 and preventing electric arcs generated by the moving contact and the static contact from running onto the magnetic pole plate 2.

In this embodiment, the lower shield 6 includes an elastic connector 61 extending to the outside of the bottom surface of the lower shield 6, as shown in fig. 11 to 14. The elastic connection member 61 is in contact with the top surface of the magnetic pole plate 2 so that a gap is formed between the bottom surface of the lower shield 6 and the magnetic pole plate 2. Whereby said elastic connection 61 gives the lower shield 6 a certain elastic space. In the assembly process of the relay, the shell 1 is fixedly connected with the annular convex rib 21 of the magnetic pole plate 2 in a manner of partially melting or completely melting the annular convex rib 21 in a laser welding manner through the connecting ring 10. When different relays are assembled, the distances between the housings 1 and the magnetic pole plates 2 of different relays are different due to different welding time or strength. The connecting edge 31 of the upper shield 3 is located between the bottom surface of the housing 1 and the top surface of the lower shield 6, and the lower shield 6 is located above the pole plate 2. In the assembly process of the relay, the accumulated assembly tolerance can be absorbed through the elastic deformation of the elastic connecting piece 61 of the lower shielding case 6, so that the connecting edge 31 of the upper shielding case 3 is respectively abutted and attached to the bottom surface of the shell 1 and the top surface of the lower shielding case 6. After the relay is assembled, the position of the upper shielding case 3 can be well fixed, and therefore the precision of the first magnetic conduction block 4 in the space direction is guaranteed.

Furthermore, the elastic force value of the elastic connecting piece 61 can ensure that the upper shield cover 3 and the lower shield cover 6 do not move up and down in the accommodating cavity due to vibration impact and the like. In a preferred embodiment, the top surface of the lower shield 6 is provided with an annular protrusion 64 protruding upward, as shown in fig. 11 to 14. Annular protrusion 64 stretches into go up the intracavity that holds of shield cover 3, connection edge 31 is located the annular protrusion 64 outside and with the top surface laminating of shield cover 6 down avoids last shield cover 3 and the relative horizontal direction of shield cover 6 to remove down.

In one embodiment, the lower shield 6 has two through slots 63 and elastic connectors 61 corresponding to the through slots 63 one by one, as shown in fig. 11 and 12. Wherein the elastic connecting member 61 comprises a cross-shaped connecting arm 613 and two protrusions 614, as shown in fig. 12. Two opposite short side walls of the cross-shaped connecting arm 613 are fixedly connected with two sides of the through groove 63, and a gap is formed between the two opposite long side walls and the side walls of the through groove 63. The two protruding portions 614 are fixed to the outer sides of the two opposite long side walls of the cross-shaped connecting arm 613 and extend to the outer side of the lower shield 6. The two opposite long side walls of the cross-shaped connecting arm 613 move towards the through groove 63 through deformation, and the distance from the lower shield 6 to the magnetic pole plate 2 is changed, so that the accumulated tolerance generated during the assembly of the relay is absorbed, the connecting edge 31 of the upper shield 3 is in contact fit with the bottom surface of the housing 1 and the top surface of the lower shield 6 respectively, and the position of the upper shield 3 in the housing 1 is ensured. The height of the projection 614 is a travel distance by which the lower shield 6 can move. The lower shield 6 and the elastic connection member 61 are integrally formed.

In one embodiment, the bottom surface of the lower shield 6 is recessed upwardly to form two grooves 62, as shown in fig. 13 and 14. Two grooves 62 are symmetrically provided on the bottom surface of the lower shield 6. The lower shield 6 includes two elastic connectors 61, each of which is fixed in a corresponding recess 62, as shown in fig. 13 and 14. Wherein, two elastic connecting pieces 61 extend out of the two grooves 62 by the elastic stroke of the elastic connecting pieces 61. The number of the grooves 62 and the number of the elastic connecting pieces 61 can be set arbitrarily according to requirements, and the arrangement position is avoided by the middle penetrating hole.

The elastic connection member 61 includes a connection plate 611 and two elastic sidewalls 612 disposed at both sides of the connection plate 611, as shown in fig. 13 and 14. The connecting plate 611 is detachably connected to the bottom of the groove 62, and the two elastic side walls 612 extend to the outside of the lower shield 6. The lower shield 6 changes the distance from the lower shield 6 to the magnetic pole plate 2 through the elastic deformation of the two elastic side walls 612, thereby absorbing the accumulated tolerance generated during the assembly of the relay, so that the connecting edge 31 of the upper shield 3 is respectively contacted and attached with the bottom surface of the housing 1 and the top surface of the lower shield 6, thereby ensuring the position of the upper shield 3 in the housing 1. The detachable manner includes a fastener connection or a snap connection, etc. The groove 62 may allow for detachably attached fasteners, snaps, etc. to be located within the groove 62, thereby improving the stability of the upper and lower shields 3, 6. Preferably, the ends of the two elastic sidewalls 612 extend in a direction away from each other to form a V-shape or in a direction close to each other, as shown in fig. 13 and 14.

In addition, the bottom surface of the lower shield 6 may not be provided with the groove 62. The connection plate 611 of the elastic connection member 61 is directly fixedly connected to the bottom surface of the lower shield 6. In addition, the elastic connecting piece 61 can also adopt a plastic wedge-shaped, L-shaped, i-shaped and other plane structure which is higher than the lower end surface of the lower shielding case 6, so that the lower shielding case 6 has elasticity with a certain stroke, and the elastic connecting piece 61 can also be fixedly connected with the lower shielding case 6 in a metal spring, elastic sheet and other modes.

The relay is in the equipment in-process, to the acceping of relay in the chamber be sealed in can carry out refrigerated gas to electric arc, strengthened the arc extinguishing performance of the anti short circuit structure of relay. The gas may be a mixed gas mainly containing hydrogen.

The top of the pushing component of the relay is connected with the movable contact bridge and used for pushing the movable contact bridge to be communicated with or disconnected from the two static contacts, the lower shielding cover of the relay comprises an elastic connecting piece which enables the lower shielding cover to have a certain stroke, the elastic connecting piece can absorb assembly tolerance when the shell and the magnetic pole plate are welded in the assembling process, stable contact fitting of the upper shielding cover and the lower shielding cover can be guaranteed, accordingly, the movable contact bridge and the two static contacts can be well kept in suction, and the working stability and the short circuit resistance of the relay are greatly improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (15)

1. A relay, characterized in that the relay comprises:

the magnetic pole plate comprises a shell (1) and a magnetic pole plate (2), wherein the shell and the magnetic pole plate surround to form a containing cavity;

the upper shielding cover (3) is arranged in the accommodating cavity, the lower end of the upper shielding cover (3) extends outwards horizontally along the circumferential direction to form a connecting edge (31), and the connecting edge (31) is positioned below the bottom surface of the shell (1);

the first magnetic conduction block (4) is fixedly arranged at the top of the inner side of the upper shielding case (3);

the two static contacts (5) are fixedly connected with the shell (1) and penetrate through the shell (1) and the upper shielding case (3);

a lower shield (6) located between the connecting edge (31) and the pole plate (2);

the movable contact bridge (7) is positioned below the two static contacts (5) and between the lower shielding case (6), and the two movable contacts of the movable contact bridge (7) correspond to the two static contacts (5);

the top of the pushing component (8) is connected with the movable contact bridge (7) to push the two movable contacts of the movable contact bridge (7) to be connected with or disconnected from the two fixed contacts (5);

the second magnetic conduction block (9) is fixedly connected with the movable contact bridge (7) and is arranged opposite to the first magnetic conduction block (4), and the first magnetic conduction block (4) and the second magnetic conduction block (9) form a magnetic conduction loop so that the second magnetic conduction block (9) drives the movable contact bridge (7) to move upwards;

the lower shielding case (6) comprises an elastic connecting piece (61) extending to the outer side of the bottom surface of the lower shielding case (6), and the connecting edge (31) of the upper shielding case (3) is abutted to the bottom surface of the shell (1) and the top surface of the lower shielding case (6) through the elastic force of the elastic connecting piece (61).

2. The relay according to claim 1, characterized in that the elastic connector (61) comprises a connection plate (611) and two elastic side walls (612) disposed on both sides of the connection plate (611), the connection plate (611) being connected to a bottom surface of the lower shield (6), the two elastic side walls (612) extending to an outside of the lower shield (6).

3. The relay according to claim 2, characterized in that both of the resilient side walls (612) are bent simultaneously inwards or simultaneously outwards with respect to the connection plate (611).

4. The relay according to claim 2, characterized in that the bottom surface of the lower shield (6) is recessed upwards forming at least two grooves (62);

the lower shielding case (6) comprises elastic connecting pieces (61) which correspond to the grooves (62) one by one, connecting plates (611) of the elastic connecting pieces (61) are connected with the bottoms of the grooves (62), and two elastic side walls (612) extend to the outer side of the lower shielding case (6).

5. The relay according to claim 1, wherein the lower shield (6) comprises at least two through slots (63) and elastic connecting pieces (61) connected with the through slots (63) in a one-to-one correspondence manner, two ends of each elastic connecting piece (61) are provided with two protruding parts (614) extending to the outer side of the bottom surface of the lower shield (6), and the protruding parts (614) are controlled to drive the elastic connecting pieces (61) to move towards the inner sides of the through slots (63).

6. The relay according to claim 5, wherein the elastic connecting member (61) comprises a cross connecting arm (613) and two protrusions (614), two opposite short side walls of the cross connecting arm (613) are fixedly connected with two sides of the through groove (63), two protrusions (614) are fixed at two ends of two opposite long side walls of the cross connecting arm (613) and extend to the outer side of the lower shield cover (6), and the sum of the lengths of the two opposite long side walls of the cross connecting arm (613) is smaller than the length of the through groove (63).

7. The relay according to claim 1, characterized in that the resilient connection (61) is a spring which is fixedly connected to the bottom surface of the lower shield (6).

8. The relay according to claim 1, wherein the top surface of the lower shield (6) is provided with an annular protrusion (64) protruding upward, the annular protrusion (64) protrudes into the upper shield (3), and the connecting edge (31) is located outside the annular protrusion (64) and is attached to the top surface of the lower shield (6).

9. The relay according to any one of claims 1 to 8, wherein two connecting posts (32) are convexly provided on the inner side of the top of the upper shield (3), the two stationary contacts (5) respectively penetrate through the housing (1) and the corresponding connecting posts (32), and the first magnetic conductive block (4) is fixed between the two connecting posts (32) and is distributed above the movable contact bridge (7) along the width of the movable contact bridge (7).

10. The relay according to claim 9, wherein the upper shield (3) comprises a plurality of arc-extinguishing windows (33), the plurality of arc-extinguishing windows (33) are respectively arranged around the upper shield (3), and the arc-extinguishing windows (33) are arranged opposite to the moving contact and the fixed contact.

11. The relay according to claim 1, characterized in that the relay further comprises a connection ring (10), the lower shield (6) being located inside the connection ring (10);

the upper part of the magnetic pole plate (2) is convexly provided with an annular convex rib (21), and the shell (1) is connected with the magnetic pole plate (2) through the connecting ring (10) and the convex rib (21).

12. The relay according to claim 1, characterized in that the width of the movable contact bridge (7) is recessed inwards on both sides to form notches (71);

second magnetic conduction piece (9) are U type structure, second magnetic conduction piece (9) are located the below of movablely touching bridge (7), the both sides wall of second magnetic conduction piece (9) passes breach (71) and the orientation of movablely touching bridge (7) both sides first magnetic conduction piece (4) extend.

13. The relay according to claim 12, characterized in that the push assembly (8) comprises:

the fixed support (81) is positioned below the movable contact bridge (7);

the stop plate (82) comprises a bearing plate (821) and two fixing side arms (822), the two fixing side arms (822) are arranged on two sides of the bearing plate (821) along the width direction of the movable contact bridge (7), the bearing plate (821) is buckled on the top surface of the movable contact bridge (7), and the two fixing side arms (822) respectively extend to two sides of the fixing support (81) and are fixedly connected with the fixing support (81);

the first elastic piece (83), the first elastic piece (83) is arranged between the two fixed side arms (822), one end of the first elastic piece (83) is connected with the fixed support (81), and the other end of the first elastic piece (83) is connected with the movable contact bridge (7);

the push rod (84), the push rod (84) run through magnetic pole plate (2) with shield cover (6) down and with magnetic pole plate (2) with shield cover (6) swing joint down, the top of push rod (84) with fixed bolster (81) dorsad the one side of first elastic component (83) is connected.

14. The relay according to claim 13, wherein the receiving plate (821) has two openings (85), two side walls of the second magnetic conductive block (9) respectively penetrate through the corresponding openings (85), and end surfaces of the two side walls of the second magnetic conductive block (9) are higher than a top surface of the receiving plate (821).

15. The relay according to claim 13, further comprising:

the sleeve (11) is positioned below the magnetic pole plate (2) and is fixedly connected with the magnetic pole plate (2);

the static iron core (12) is positioned in the sleeve (11) and the magnetic pole plate (2), and the static iron core (12) is fixedly connected with the sleeve (11) and the magnetic pole plate (2);

the movable iron core (13) is movably arranged in the sleeve (11) and is positioned below the static iron core (12);

the two ends of the second elastic piece (14) are respectively connected with the static iron core (12) and the movable iron core (13);

the pushing rod (84) penetrates through the static iron core (12) and the second elastic piece (14) and penetrates into the movable iron core (13), the pushing rod (84) is movably connected with the static iron core (12), and the pushing rod (84) is fixedly connected with the movable iron core (13).

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