CN116153721A - Electromagnetic relay capable of reducing occupied space - Google Patents

Abstract

The invention discloses an electromagnetic relay capable of reducing occupied space, which comprises a base, a magnetic circuit part and a contact part, wherein the contact part comprises at least one normally open contact group and at least one normally closed contact group, the normally open contact group and the normally closed contact group respectively comprise a movable spring part and a static spring part which are mutually matched, and the movable spring part comprises a movable reed and a movable contact; the normally open contact set and the normally closed contact set are arranged on the base along a first horizontal direction, and the free ends of the movable reeds are respectively provided with movable contacts; the free ends of the movable reeds of the normally open contact group and the free ends of the movable reeds of the normally closed contact group face to different sides in a second direction perpendicular to the first direction, and the movable reeds of the normally open contact group extend obliquely towards the opening direction of the contacts, and/or the movable reeds of the normally closed contact group extend obliquely towards the closing direction of the contacts. The contact sets are more compact, and the occupied space of the product in the first direction is reduced.

Description

Electromagnetic relay capable of reducing occupied space

Technical Field

The present invention relates to a relay, and more particularly, to an electromagnetic relay with reduced space occupation.

Background

An electromagnetic relay is an electronic control device which is commonly used in automatic control circuits and is actually an "automatic switch" which uses a smaller current to control a larger current, thus playing roles in automatic regulation, safety protection, switching circuits, etc. in the circuit.

An electromagnetic relay of the prior art comprises a magnetic circuit part and a plurality of contact sets, wherein the contact sets comprise at least one normally closed contact set and at least one normally open contact set, the normally open contact set and the normally closed contact set are arranged in a line, the free ends of a movable reed of the normally open contact set and a movable reed of the normally closed contact set respectively extend towards the same side in the same direction, and movable contacts are arranged, namely, the contacts of the normally open contact set and the normally closed contact set are positioned on the same side; the armature of the magnetic circuit part is matched with each movable spring through the pushing card so as to drive the normally open contact set to be closed and the normally closed contact set to be opened when the coil of the magnetic circuit part is electrified. Because the length that the contact group occupy is at least the motion displacement of all contact groups plus the length of necessary creepage and air clearance, consequently, the minimum length that above-mentioned a plurality of contact group's arrangement mode lead to whole occupation is the motion displacement sum of each contact group plus the length of necessary creepage and air clearance, and this just causes whole occupation length great, is unfavorable for realizing the miniaturization of product.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides an electromagnetic relay with reduced occupied space, which reduces the occupied length of the whole contact set by improving the arrangement mode of the contact set.

The technical scheme adopted for solving the technical problems is as follows: an electromagnetic relay capable of reducing occupied space comprises a base, a magnetic circuit part and a contact part, wherein the contact part comprises at least one normally open contact group and at least one normally closed contact group, the normally open contact group and the normally closed contact group are arranged on the base along a first horizontal direction, and the free end of a movable reed of the normally open contact group and the free end of a movable reed of the normally closed contact group are respectively provided with a movable contact; the armature iron of the magnetic circuit part is matched with each movable spring through the pushing card, so that the normally open contact set is closed and the normally closed contact set is opened when the coil of the magnetic circuit part is electrified; the free ends of the movable reeds of the normally open contact group and the free ends of the movable reeds of the normally closed contact group face to different sides in a second direction perpendicular to the first direction, and the movable reeds of the normally open contact group extend obliquely towards the opening direction of the contacts, and/or the movable reeds of the normally closed contact group extend obliquely towards the closing direction of the contacts.

Further, the normally open contact set and the normally closed contact set are the same component; the movable spring leading-out pin of the normally closed contact group and the static spring leading-out pin of the adjacent normally open contact group are positioned at one side of the second direction and are staggered with each other in the first direction; the static spring leading-out pin of the normally closed contact group and the movable spring leading-out pin of the adjacent normally open contact group are positioned at the other side of the second direction and are staggered with each other in the first direction; the second direction is a horizontal direction.

Further, the pushing card is provided with at least one first limit groove, and the movable reed of the normally open contact group is inserted into the corresponding first limit groove; the pushing card is also provided with at least one pushing claw for pushing the movable reed of the normally closed contact group to move; the push card is also provided with a plurality of clapboards which are distributed along the first direction, and each clapboard is respectively positioned between two adjacent normally-closed contact groups or between two adjacent normally-open contact groups or between two adjacent normally-closed contact groups and normally-open contact groups.

Further, the device also comprises a shell with an opening at the bottom end, wherein the bottom end of the shell is connected with the base and accommodates the magnetic circuit part, the contact part and the pushing card; the inner top surface of the shell is provided with at least one guiding post extending downwards, and the bottom of the guiding post is inserted and fixed in a groove or a through hole which is correspondingly arranged on the base.

Further, the part of the guide post positioned in the groove or the through hole is a thin section, and the part above the thin section is a thick section; the number of the guide posts is plural, and the plurality of guide posts are arranged in at least one row, each row being located in the first direction.

Further, the fixing mode of the bottom of the guide post and the base comprises one or more of glue dispensing fixing, hot riveting fixing and buckling connection.

Further, the base is provided with a plurality of contact cavities which are arranged along the first direction, adjacent contact cavities are separated by a first partition wall, and each contact cavity is respectively provided with a normally open contact group or a normally closed contact group; the inner top surface of the shell is provided with a plurality of first ribs which are arranged along the first direction, each first rib extends along the horizontal direction perpendicular to the first direction, and each first rib enters different contact cavities respectively and approaches to the first partition wall; the bottom ends of the first ribs are lower than the top ends of the first partition walls.

Further, the base is provided with second partition walls for separating the magnetic circuit part from the contact part, the number of the second partition walls is two, a long groove extending along the first direction is formed between the two second partition walls, the inner top surface of the shell is provided with second ribs extending along the first direction, and the second ribs are inserted into the long groove.

Further, the magnetic circuit part comprises a coil assembly, a yoke, the armature and a pressure spring, the yoke is fixed on the coil assembly, the pressure spring comprises a fixing part and a spring piece part which is arranged on the fixing part and used for providing restoration counterforce for the armature, the fixing part is clamped on the yoke, and the fixing part and/or the spring piece part limit the armature at the knife edge of the yoke, so that the armature can swing around the knife edge of the yoke and limit the armature in the thickness direction and/or the width direction of the knife edge of the yoke.

Further, the fixing part is provided with a hollow inner cavity, the fixing part is sleeved outside the yoke along the length direction of the part where the knife edge is located from one end of the yoke where the knife edge is located, and the fixing part is connected with the yoke in a buckling manner when being sleeved in place so as to limit the fixing part to be separated from the yoke from the direction opposite to the sleeving direction; limiting steps are respectively arranged on two opposite side surfaces of the yoke for limiting the sleeving depth of the fixing part

Further, the fixing part is in a semi-surrounding frame shape and comprises a main sheet body and two side sheet bodies, the two side sheet bodies are arranged at two opposite ends of the main sheet body and are oppositely arranged, one ends of the two side sheet bodies, which are far away from the main sheet body, are respectively bent inwards relatively to form two opposite stop sheets; when the fixing part is sleeved in place, the main sheet body and the stop sheet are positioned at two opposite sides of the yoke, one or more of the main sheet body, the side sheet body and the stop sheet are connected with the yoke in a buckling manner, and one end of the armature, which is matched with the knife edge, is positioned between the two sheet bodies and blocked by the stop sheet; the elastic piece part is arranged on the main sheet body; the two sides of one end of the armature, which is matched with the knife edge, are respectively provided with a limiting block, the two limiting blocks are respectively provided with a yielding gap, and the limiting blocks enter the fixing part through the yielding gap and are prevented from yielding gaps and are blocked by the limiting blocks by moving along with the armature in the opposite direction of the sleeving direction of the fixing part.

Further, a pushing arm extending along the direction from one end of the armature far away from the knife edge to one end of the armature matched with the knife edge is arranged at one end of the armature matched with the knife edge; the fixed part is provided with a limiting piece extending to one side close to the coil assembly along the thickness direction of the part where the knife edge of the yoke is located, and the limiting piece is matched with one side of the armature opposite to the yoke; the elastic piece part is arranged at one end of the limiting piece, facing the pushing arm, and is propped against one surface of the pushing arm, opposite to the yoke iron; the pushing arm penetrates through the abdication hole arranged on the fixing part, and the abdication hole extends to the limit piece.

Compared with the prior art, the invention has the following beneficial effects:

1. because the free ends of the movable reeds of the normally open contact group and the movable reeds of the normally closed contact group face different sides in the second direction, and the movable reeds of the normally open contact group extend obliquely in the contact opening direction, and/or the movable reeds of the normally closed contact group extend obliquely in the contact closing direction, when the contact groups are arranged as close to each other as possible, the movable displacement of the movable reeds of the normally closed contact group can occupy a part of the positions of the fulcrums of the movable reeds of the normally open contact group (the fulcrum parts of the movable reeds move very little in the moving direction), and/or the movable displacement of the movable reeds of the normally open contact group can occupy a part of the positions of the fulcrums of the movable reeds of the normally closed contact group, so that the contact groups are more compact, and the occupied space of products in the first direction is reduced.

2. Because the normally open contact set and the normally closed contact set are the same component, the normally closed contact set and the components of the normally open contact set can be shared, so that the die opening cost and the number of dies are reduced.

3. The movable spring leading-out pin of the normally closed contact group and the static spring leading-out pin of the adjacent normally open contact group are positioned on the same side in the second direction and staggered in the first direction, the static spring leading-out pin of the normally closed contact group and the movable spring leading-out pin of the adjacent normally open contact group are positioned on the other side in the second direction and staggered in the first direction, and the second direction is the horizontal direction, so that the wiring of customers is facilitated, and the creepage distance and the air gap between the adjacent normally open contact group and the normally closed contact group are increased.

4. The inner top surface of the shell is provided with at least one guide post extending downwards, and the bottom of the guide post is inserted and fixed in a groove or a through hole which is correspondingly arranged on the base, so that the top wall of the shell can be pulled by the guide post, the top wall of the shell is thinner and/or is not easy to warp and deform under the condition of large area, and the bulge and deformation of the top wall of the shell caused by the internal and external air pressure difference of a product after plastic package are avoided.

5. The part that the guide post is arranged in recess or through-hole is the thin section, and the part more than the thin section is the thick section, can reduce the space of stepping down of base to the guide post on the one hand, on the other hand can strengthen the intensity of guide post.

6. The first ribs are matched with the first partition wall, so that contact splashes generated by contact component breakage can be isolated, and the contact splashes are prevented from running to other contact cavities, thereby improving the cleanliness of each contact cavity and improving the reliability of electric contact of the invention. Particularly, the invention adopts the first rib to replace the partition board in the prior art, greatly reduces the height, does not deform the shell, can keep the outer surface of the shell flat, and does not generate welding marks at the positions corresponding to the first rib

7. The second ribs are inserted into the long grooves formed by the two second partition walls, so that the creepage distance and the space clearance between the contact part and the magnetic circuit part can be obviously improved, the height of the second ribs can be made very low, the shell cannot be deformed, the outer surface of the shell is kept flat, and welding marks cannot be generated at the positions corresponding to the second ribs. If the number of the second partition walls is one, the height of the second ribs needs to be made relatively high in order to ensure a sufficient creepage distance and a sufficient space gap between the contact portion and the magnetic circuit portion, which easily causes deformation of the housing and occurrence of weld marks.

8. The pressure spring comprises the fixing part and the elastic piece part, the fixing part is clamped on the yoke, and the fixing part and/or the elastic piece part limit the armature at the knife edge of the yoke, so that the armature can swing around the knife edge of the yoke and limit the armature in the thickness direction and/or the width direction of the part where the knife edge of the yoke is located.

The invention is described in further detail below with reference to the drawings and examples; an electromagnetic relay of the present invention that reduces the occupied space is not limited to the embodiment.

Drawings

FIG. 1 is an exploded schematic view of the present invention;

fig. 2 is a schematic perspective view of the contact portion of the present invention;

FIG. 3 is a schematic perspective view of a pusher card of the present invention;

FIG. 4 is a top view (without the housing) of the present invention;

FIG. 5 is a schematic perspective view of the housing of the present invention;

FIG. 6 is a top view of the housing of the present invention;

FIG. 7 is a cross-sectional view A-A of FIG. 6;

FIG. 8 is a top view of the base of the present invention;

FIG. 9 is a B-B cross-sectional view of FIG. 8;

FIG. 10 is a bottom view of the present invention;

FIG. 11 is a C-C cross-sectional view of FIG. 10;

fig. 12 is a schematic perspective view of the compression spring of the present invention;

fig. 13 is a schematic perspective view of an armature of the present invention;

fig. 14 is a schematic perspective view of the yoke of the present invention;

fig. 15 is a schematic diagram of an assembly of an armature and a compression spring of the present invention;

fig. 16 is a second schematic illustration of the assembly of the armature and the compression spring of the present invention;

fig. 17 is a third schematic illustration of the assembly of the armature with the compression spring of the present invention;

fig. 18 is a schematic diagram of the armature and spring assembly of the present invention assembled with the yoke;

fig. 19 is a schematic perspective view of the magnetic circuit portion of the present invention;

FIG. 20 is a top view of a magnetic circuit portion of the present invention;

wherein 1, base, 11, through hole, 12, first partition, 13, second partition, 14, elongated slot, 2, outer shell, 21, guide post, 211, thin section, 212, thick section, 22, first rib, 23, second rib, 3, magnetic circuit part, 31, yoke, 311, card hole slot, 312, limit step, 313, knife edge, 32, armature, 321, push arm, 322, bump, 33, pressure spring, 331, spring piece part, 332, main piece body, 333, side piece body, 334, stop piece, 335, clip, 336, limit piece, 337, relief hole, 338, relief notch, 4, normally open contact group, 5, normally closed contact group, 41/51, movable spring, 42/52, movable contact, 43/53, static spring part, 44/54, movable spring lead-out foot, 45/55, static spring lead-out foot, 6, push clip, 61, first limit slot, 62, push claw, 63, stop piece, 64, second limit slot.

Detailed Description

In the present disclosure, the terms "first," "second," and the like are used merely to distinguish between similar objects and not necessarily to describe a particular sequence or order, nor are they to be construed as indicating or implying a relative importance. In addition, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Referring to fig. 1 to 20, an electromagnetic relay with reduced space occupation according to the present invention includes a base 1, a magnetic circuit portion 3, and a contact portion, wherein the contact portion includes at least one normally open contact group 4 and at least one normally closed contact group 5, the normally open contact group 4 and the normally closed contact group 5 include a movable spring portion and a fixed spring portion 43/53, respectively, which are engaged with each other, and the movable spring portion includes a movable spring 41/51 and a movable contact 42/52; the normally open contact set 4 and the normally closed contact set 5 are arranged on the base 1 along a first horizontal direction, and the free ends of the movable reeds are respectively provided with movable contacts 42/52; the armature 32 of the magnetic circuit portion 3 cooperates with the movable springs by pushing the card 6 to close the normally open contact group 4 and open the normally closed contact group 5 when the coil of the magnetic circuit portion 3 is energized. The free end of the movable reed 41 of the normally open contact group 4 is oriented to a different side from the free end of the movable reed 51 of the normally closed contact group 5 in the second direction perpendicular to the first direction, and the movable reed 41 of the normally open contact group 4 is inclined in the contact opening direction thereof, and/or the movable reed 51 of the normally closed contact group 5 is inclined in the contact closing direction thereof, specifically, in this embodiment, only the movable reed 41 of the normally open contact group 4 is inclined in the contact opening direction thereof (i.e., rightward direction in the view of fig. 4) and the inclination angle is 5 ° to 10 °, while the extending direction of the movable reed 51 of the normally closed contact group 5 in the contact closing state thereof is substantially perpendicular to the first direction. The second direction is a horizontal direction, specifically, the first direction is a longitudinal direction of the base 1 (i.e. a direction in which the Y axis in the three-dimensional coordinate system of fig. 1 is located), the second direction is a width direction of the base 1 (i.e. a direction in which the X axis in the three-dimensional coordinate system of fig. 1 is located), but not limited thereto, and in other embodiments, the second direction is a height direction of the base. The number of the normally open contact sets 4 is plural, and the number of the normally closed contact sets 5 is two, but not limited to this, and the plurality of normally open contact sets 4 are located between the two normally closed contact sets 5.

In this embodiment, the normally open contact set 4 and the normally closed contact set 5 are the same component, specifically, the moving spring portion of the normally open contact set 4 and the moving spring portion of the normally closed contact set 5 are the same component, and the static spring portion 43 of the normally open contact set 4 and the static spring portion 53 of the normally closed contact set 5 are the same component. Therefore, the components of the normally-closed contact group 5 and the normally-open contact group 4 can be shared, thereby reducing the mold opening cost and the number of molds.

In this embodiment, the root of each movable spring is bent twice to form the structure shown in fig. 2, and the movable spring leading-out pins 44/54 extending downward are fixed. As shown in fig. 10, the moving spring pin 54 of the normally closed contact group 5 and the stationary spring pin 45 of the adjacent normally open contact group 4 are located on the same side in the second direction and are offset from each other in the first direction; the static spring leading-out pin 55 of the normally closed contact group 5 and the moving spring leading-out pin 44 of the adjacent normally open contact group 4 are positioned at the other side of the second direction and are staggered with each other in the first direction. Thus, not only is the wiring of customers facilitated, but also the creepage distance and the air gap between the adjacent normally open contact set 4 and the normally closed contact set 5 are increased, and the creepage distance and the air gap between the adjacent normally open contact set 4 and the normally closed contact set 5 are shown as a line segment S in FIG. 10.

In this embodiment, as shown in fig. 3, the push card 6 is provided with at least one first limit groove 61 for driving the movable reed 41 of the normally open contact set 4 to move, and the movable reed of the normally open contact set 4 is inserted into the corresponding first limit groove 61; the pushing card 6 is further provided with at least one pushing claw 62 for pushing the movable reed of the normally closed contact group 5 to move, and the pushing claw 62 is positioned on the side of the movable reed 51 of the corresponding normally closed contact group 5 facing the static reed part. The push card 6 is further provided with a plurality of separators 63 arranged along the first direction, and each separator 63 is respectively positioned between two adjacent normally closed contact sets 5 or between two adjacent normally open contact sets 4 or between two adjacent normally closed contact sets 5 and normally open contact sets 4.

In this embodiment, the present invention further comprises a housing 2 having an open bottom end, wherein the bottom end of the housing 2 is connected to the base 1 and accommodates the magnetic circuit portion 3, the contact portion and the pusher card 6 therein. As shown in fig. 5-7, at least one guiding post 21 extending downward is disposed on the inner top surface of the housing 2, and the bottom of the guiding post 21 is inserted and fixed in a through hole 11 correspondingly disposed on the base 1. Specifically, the number of the guide posts 21 is plural, and the plurality of guide posts 21 are arranged in at least one row, each row being arranged along the horizontal first direction, and specifically, in the present embodiment, the plurality of guide posts 21 are arranged in one row, but not limited thereto. The guide posts 21 are each located approximately at the middle position of the housing 2 in the width direction. The part of the guide post 21 located in the through hole 11 is a thin section 211, the part above the thin section 211 is a thick section 212, the cross section of the thin section 211 is circular, and the cross section of the thick section 212 is square. In this way, the space for the base 1 to give way to the guide post 21 can be reduced, and the strength of the guide post 21 can be enhanced.

In this embodiment, the fixing manner of the bottom of the guide post 21 and the base 1 includes one or more of dispensing fixing, hot riveting fixing, and snap connection. When the guide posts 21 are fixed in a manner that does not require a fixing operation at the bottom end of the base 1, the through holes 11 may be replaced with grooves (alternatively called blind holes, countersinks).

In this embodiment, as shown in fig. 8, the base 1 is provided with a plurality of contact cavities arranged along the first direction, adjacent contact cavities are separated by a first partition wall 12 provided on the base 1, the first partition wall 12 extends along the first direction, and each contact cavity is provided with one normally open contact set 4 or one normally closed contact set 5. The inner top surface of the housing 2 is provided with a plurality of first ribs 22 arranged along the first direction, each first rib 22 extends along a horizontal direction (i.e. the second direction) perpendicular to the first direction, and each first rib 22 enters different contact cavities respectively and approaches the first partition wall 12. The bottom end of the first rib 22 is lower than the top end of the first partition wall 12, and the first rib 22 is a short rib, the height of the short rib is only slightly greater than the distance between the top end of the first partition wall 12 and the inner top surface of the shell, and specifically, the height of the first rib 22 is less than 1mm. Therefore, the height of the first rib 22 can be made low so as not to deform the housing 2 and to keep the outer surface of the housing 2 flat, and no weld mark is generated at the position corresponding to the first rib 22. If the first rib 22 is replaced by a baffle with a larger height, the two ends of the baffle in the length direction are free ends and are not connected with other structures of the shell, so that deformation occurs in injection molding of the top wall of the shell, and once the shell is deformed, the problems of incomplete assembly or bad clamping and scrapping and the like easily occur in the subsequent assembly process. The first ribs 22 and the first partition wall 12 form a barrier through mutual matching, so that contact splashes generated by contact component breakage can be isolated, and the contact splashes are prevented from running to other contact cavities through gaps between the top end of the first partition wall 12 and the inner top surface of the shell 2, thereby improving the cleanliness of each contact cavity and improving the reliability of electric contact of the invention.

In this embodiment, as shown in fig. 8, the magnetic circuit portion 3 is horizontal, the magnetic circuit portion 3 and the contact portion are arranged along the second direction, the base 1 is provided with second partition walls 13 for separating the magnetic circuit portion 3 from the contact portion, the second partition walls 13 extend along the first direction, the number of the second partition walls 13 is two, the two second partition walls 13 are arranged in parallel, an elongated slot 14 extending along the first direction is formed between the two second partition walls 13, a second rib 23 extending along the first direction is arranged on the inner top surface of the housing 2 at a position corresponding to the elongated slot 14, and the second rib 23 is inserted into the elongated slot 14. In this way, not only the creepage distance and the space gap between the contact portion and the magnetic circuit portion 3 can be significantly increased, but also the height of the second rib 23 can be made very low, so that the outer shell 2 is not deformed, the outer surface of the outer shell 2 is kept flat, and no welding trace is generated at the position corresponding to the second rib 23. If the number of the second partition walls 13 is one, in order to ensure a sufficient creepage distance and a sufficient space gap between the contact portion and the magnetic circuit portion, the height of the second ribs needs to be made relatively high or a baffle plate needs to be used instead, which easily causes deformation and weld marks in the injection molding process of the housing. In this embodiment, the height of the second ribs 23 is less than 2mm, in particular less than or equal to 1.5mm.

In this embodiment, the magnetic circuit portion 3 includes a coil block, a yoke 31, an armature 32, and a compression spring 33, and the yoke 31 is fixed to the coil block. Specifically, the coil assembly includes a coil bobbin 34, a coil 35 wound around the coil bobbin 34, and an iron core 36 penetrating through the coil bobbin 34, the yoke 31 is L-shaped, one side of the yoke 31 is riveted and fixed with one end of the iron core 36, and a free end of the other side of the yoke 31 is provided with a knife edge 313. The compression spring 33 includes a fixing portion and a spring piece portion 331 disposed on the fixing portion and configured to provide a restoring reaction force for the armature 32, where the fixing portion is clamped to the yoke 31, and the fixing portion and/or the spring piece portion 331 limit the armature 32 at the edge 313 of the yoke 31, so that the armature 32 can swing around the edge 313 of the yoke 31, and limit the thickness direction (i.e., the direction in which the X axis is located in the three-dimensional coordinate system in fig. 1) and/or the width direction (i.e., the direction in which the Z axis is located in the three-dimensional coordinate system in fig. 1) of the portion of the armature 32 where the edge 313 of the yoke 31 is located. The knife edge 313 of the yoke 31 is located on the other side of the yoke 31.

In this embodiment, the fixing portion is hollow, a sleeve opening is provided at one end of the fixing portion, the fixing portion is sleeved outside the yoke 31 along a length direction of a portion where the knife edge 313 is located (i.e., a direction where a Y axis in a three-dimensional coordinate system in fig. 1 is located) from one end of the yoke 31 where the knife edge 313 is located, and the fixing portion is in snap connection with the yoke 31 when being sleeved in place, so as to limit the fixing portion from being separated from the yoke 31 in a direction opposite to the sleeving direction. One end of the armature 32, which is matched with the knife edge 313, is positioned in the fixing part so as to be limited by the fixing part in the thickness direction and/or the width direction of the part of the yoke 31 where the knife edge 313 is positioned.

In this embodiment, the fixing portion is provided with a locking tongue 335 (as shown in fig. 12), the yoke 31 is provided with a locking groove 311 (as shown in fig. 14), and when the fixing portion is sleeved in place, the locking tongue 335 is locked into the locking groove 311, so as to achieve the snap connection between the fixing portion and the yoke 31. Limiting steps 312 are respectively arranged on two opposite side surfaces of the yoke 31 and used for limiting the sleeving depth of the fixing part. Specifically, both side surfaces of the yoke 31 in the width direction of the other side thereof are provided with stopper steps 312, respectively, as shown in fig. 14.

In this embodiment, as shown in fig. 12, the fixing portion has a semi-surrounding frame structure, and includes a main sheet 332 and two side sheets 333, where the two side sheets 333 are disposed at opposite ends of the main sheet 332 and are disposed opposite to each other. The two side sheets 333 are bent inward by 90 ° or nearly 90 ° at the ends far away from the main sheet 332, respectively, to form two opposite stop sheets 334, and a space is provided between the two stop sheets 334. When the fixing portion is sleeved on the yoke 31, the main sheet 332 and the stop sheets 334 are located on two opposite sides of the yoke 31, specifically, the main sheet 332 is located on one side of the yoke 31 opposite to the coil assembly, and the two stop sheets 334 are located on one side of the yoke 31 opposite to the coil assembly. One or more of the main body 332, the side body 333 and the stopper 334 are snap-coupled to the yoke 31, specifically, in this embodiment, the main body 332 is snap-coupled to the yoke 31, that is, the main body 332 is provided with the snap-lock tab 335. The end of the armature 32 that cooperates with the knife edge 313 is located between the two side plates 333 and is blocked by the stop plate 332. Therefore, the fixing portion can limit the armature 32 in the width direction and the thickness direction of the other side of the yoke 31.

In this embodiment, two opposite sides of the end of the armature 32 matching the knife edge 313 are respectively provided with a limiting block 322, and the two limiting blocks 334 are respectively provided with a yielding gap 338 (as shown in fig. 12), where the two yielding gaps 338 are opposite. The two limiting blocks 322 enter the fixing portion through the two yielding notches 338 respectively, and move along the opposite direction of the sleeving direction of the fixing portion along with the armature 32 to avoid the yielding notches and be blocked by the stop piece 334.

In this embodiment, as shown in fig. 13, an end of the armature 32 matching the knife edge 313 extends along a direction from an end of the armature 32 away from the knife edge 313 to an end of the armature matching the knife edge 313, the push arm 321 is located at a side of the yoke 31 facing away from the coil assembly, and the elastic piece portion 331 abuts against the push arm 321.

In this embodiment, as shown in fig. 12, the other end of the fixing portion opposite to one end thereof has a limiting piece 336 extending toward a side close to the coil assembly along the thickness direction of the portion where the knife edge 313 of the yoke 31 is located, and the limiting piece 336 is engaged with a side of the armature 32 facing away from the yoke 31. Specifically, the limiting plate 336 is disposed at one of the remaining two ends of the main plate 332. The pushing arm 321 passes through the relief hole 337 provided on the fixing portion, specifically, the relief hole 337 is provided on the main sheet 332 and extends to the position limiting sheet 336. The elastic piece 331 is disposed at an end of the limiting piece 336 facing the pushing arm 321, and abuts against a surface of the pushing arm 321 opposite to the yoke 31. The spring plate 331 is a sheet-shaped body in an inclined state, and the free end thereof is bent to form a rounded portion, and the rounded portion is contacted with the pushing arm 321, so as to reduce the contact friction force therebetween. The limiting piece 336 and the elastic piece 331 thereon limit the armature 32 in the length direction of the other side of the yoke 31.

In this embodiment, the pushing arm 321 is engaged with each movable reed through the pushing card 6, and specifically, a protruding block 323 is disposed on a side surface of a free end of the pushing arm 321 and is configured to be inserted into a second limiting groove 64 disposed at one end of the pushing card 6.

In this embodiment, the assembling process of the armature 32, the compression spring 33, and the yoke 31 is as follows: firstly, the pushing arm 321 of the armature 32 passes through the relief hole 337 from the inner side of the main sheet 332, and the two limiting blocks 322 on the armature 32 are respectively aligned with the relief notches 338 of the two side sheet 333, as shown in fig. 15, and then, the two limiting blocks 322 on the armature 32 are respectively introduced into the hollow cavity through the relief notches 338, as shown in fig. 16; then, the whole armature 32 is moved towards the direction of the limiting piece 336, so that two limiting pieces 322 of the whole armature are far away from the yielding notch 338 and are blocked by the two limiting pieces 334, at this time, the armature 32 and the limiting piece 336 are close to each other, and the limiting piece 336 plays a limiting role on the armature 32, as shown in fig. 17; finally, the openings formed at two other ends of the main sheet 332 of the whole fixing portion are aligned with the knife edge 313 of the yoke 31 and are sleeved on the yoke 31, as shown in fig. 18, the arrow in the drawing indicates the moving direction of the fixing portion, when the whole fixing portion is sleeved in place, one end of the two side sheet 333 away from the limiting sheet 336 is blocked by the limiting step 312 on the yoke 31, as shown in fig. 19, so as to limit the sleeving depth of the fixing portion, and simultaneously, the clamping tongues 335 on the main sheet 332 are clamped into the clamping grooves 311 on the yoke 31, so that the whole fixing portion is limited from being separated from the yoke 31 from the opposite direction of the sleeving direction. Therefore, the fixing portion of the compression spring 33 is substantially wrapped around the yoke 31 in three or more planes, and the fixing portion of the compression spring 33 is firmly fixed to the yoke 31 by the engagement of the detent structure. After the assembly, one end of the armature 32 is mounted on the knife edge 313 of the yoke 31, and the spring plate 331 abuts against the pushing arm 321 of the armature 32, so that a magnetic gap exists between the armature 32 and the other end of the iron core 36 before the coil 35 is energized, as shown in fig. 20. Therefore, the compression spring 33 of the present invention is free from being riveted to the yoke 31 and the armature 32, so that the assembling process of the compression spring 33 is simpler and the investment of riveting equipment can be reduced. In particular, the compression spring 33 not only can provide a restoring reaction force for the armature 32, but also can provide three-dimensional limit for the armature 32, so that the installation accuracy of the armature 32 is greatly improved, the working stability of the armature 32 is also improved, and dislocation, displacement and the like of the armature 32 caused by impact, drop and the like are reduced.

According to the electromagnetic relay with reduced occupied space, the free end of the movable reed 41 of the normally open contact group 4 and the free end of the movable reed 51 of the normally closed contact group 5 face to different sides in the second direction, and the movable reed 41 of the normally open contact group 4 obliquely extends in the contact opening direction, so that when the contact groups are arranged as close as possible to each other, the movable displacement of the movable reed 51 of the normally closed contact group 5 can occupy a part of the position of the fulcrum of the movable reed 41 of the normally open contact group 4 (the fulcrum part of the movable reed 41 moves very little in the moving direction), thereby enabling the contact groups to be more compact and reducing the length space of a product. The guide posts 21 are arranged, so that the top wall of the shell 2 can be pulled by the guide posts 21, the top wall of the shell 2 is thinner and/or is not easy to warp and deform under the condition of large area, and the bulge deformation of the top wall of the shell 2 caused by the difference of air pressure between the inside and outside of the product after plastic package is avoided.

The electromagnetic relay with reduced occupied space of the invention has no related parts which are the same as or can be realized by adopting the prior art.

The above embodiment is only used for further illustrating an electromagnetic relay with reduced occupied space, but the present invention is not limited to the embodiment, and any simple modification, equivalent variation and modification of the above embodiment according to the technical substance of the present invention falls within the protection scope of the technical solution of the present invention.

Claims (12)

1. An electromagnetic relay capable of reducing occupied space comprises a base, a magnetic circuit part and a contact part, wherein the contact part comprises at least one normally open contact group and at least one normally closed contact group, the normally open contact group and the normally closed contact group are arranged on the base along a first horizontal direction, and the free end of a movable reed of the normally open contact group and the free end of a movable reed of the normally closed contact group are respectively provided with a movable contact; the armature iron of the magnetic circuit part is matched with each movable spring through the pushing card, so that the normally open contact set is closed and the normally closed contact set is opened when the coil of the magnetic circuit part is electrified; the method is characterized in that: the free ends of the movable reeds of the normally open contact group and the free ends of the movable reeds of the normally closed contact group face to different sides in a second direction perpendicular to the first direction, and the movable reeds of the normally open contact group extend obliquely towards the opening direction of the contacts, and/or the movable reeds of the normally closed contact group extend obliquely towards the closing direction of the contacts.

2. The reduced footprint electromagnetic relay of claim 1 wherein: the normally open contact set and the normally closed contact set are the same component; the movable spring leading-out pin of the normally closed contact group and the static spring leading-out pin of the adjacent normally open contact group are positioned at one side of the second direction and are staggered with each other in the first direction; the static spring leading-out pin of the normally closed contact group and the movable spring leading-out pin of the adjacent normally open contact group are positioned at the other side of the second direction and are staggered with each other in the first direction; the second direction is a horizontal direction.

3. The reduced footprint electromagnetic relay of claim 1 wherein: the push card is provided with at least one first limit groove, and the movable reed of the normally open contact set is inserted into the corresponding first limit groove; the pushing card is also provided with at least one pushing claw for pushing the movable reed of the normally closed contact group to move; the push card is also provided with a plurality of clapboards which are distributed along the first direction, and each clapboard is respectively positioned between two adjacent normally-closed contact groups or between two adjacent normally-open contact groups or between two adjacent normally-closed contact groups and normally-open contact groups.

4. The reduced footprint electromagnetic relay of claim 1 wherein: the bottom end of the shell is connected with the base, and the magnetic circuit part, the contact part and the pushing card are contained in the shell; the inner top surface of the shell is provided with at least one guiding post extending downwards, and the bottom of the guiding post is inserted and fixed in a groove or a through hole which is correspondingly arranged on the base.

5. The reduced footprint electromagnetic relay of claim 1 wherein: the part of the guide post, which is positioned in the groove or the through hole, is a thin section, and the part above the thin section is a thick section; the number of the guide posts is plural, and the plurality of guide posts are arranged in at least one row, each row being located in the first direction.

6. The reduced footprint electromagnetic relay of claim 4 or 5 wherein: the fixing mode of the bottom of the guide post and the base comprises one or more of glue dispensing fixing, hot riveting fixing and buckling connection.

7. The reduced footprint electromagnetic relay of claim 4 or 5 wherein: the base is provided with a plurality of contact cavities which are arranged along the first direction, adjacent contact cavities are separated by a first partition wall, and each contact cavity is internally provided with a normally open contact group or a normally closed contact group respectively; the inner top surface of the shell is provided with a plurality of first ribs which are arranged along the first direction, each first rib extends along the horizontal direction perpendicular to the first direction, and each first rib enters different contact cavities respectively and approaches to the first partition wall; the bottom ends of the first ribs are lower than the top ends of the first partition walls.

8. The reduced footprint electromagnetic relay of claim 4 or 5 wherein: the base is provided with second partition walls for separating the magnetic circuit part from the contact part, the number of the second partition walls is two, a long groove extending along the first direction is formed between the two second partition walls, the inner top surface of the shell is provided with second ribs extending along the first direction, and the second ribs are inserted into the long groove.

9. The reduced footprint electromagnetic relay of claim 1 wherein: the magnetic circuit part comprises a coil assembly, a yoke iron, the armature and a pressure spring, wherein the yoke iron is fixed on the coil assembly, the pressure spring comprises a fixing part and a spring piece part which is arranged on the fixing part and used for providing restoration counterforce for the armature iron, the fixing part is clamped on the yoke iron, and the fixing part and/or the spring piece part limit the armature iron at the knife edge of the yoke iron, so that the armature iron can swing around the knife edge of the yoke iron and limit the armature iron in the thickness direction and/or the width direction of the knife edge of the yoke iron.

10. The reduced footprint electromagnetic relay of claim 9 wherein: the fixing part is provided with a hollow inner cavity, the fixing part is sleeved outside the yoke along the length direction of the part where the knife edge is located from one end of the yoke where the knife edge is located, and the fixing part is connected with the yoke in a buckling manner when being sleeved in place so as to limit the fixing part to be separated from the yoke from the direction opposite to the sleeving direction; limiting steps are respectively arranged on two opposite side surfaces of the yoke and used for limiting the sleeving depth of the fixing part.

11. The reduced footprint electromagnetic relay of claim 10 wherein: the fixing part is in a semi-surrounding frame shape and comprises a main sheet body and two side sheet bodies, the two side sheet bodies are arranged at two opposite ends of the main sheet body and are oppositely arranged, one ends of the two side sheet bodies, which are far away from the main sheet body, are respectively bent inwards relatively to form two opposite stop sheets; when the fixing part is sleeved in place, the main sheet body and the stop sheet are positioned at two opposite sides of the yoke, one or more of the main sheet body, the side sheet body and the stop sheet are connected with the yoke in a buckling manner, and one end of the armature, which is matched with the knife edge, is positioned between the two sheet bodies and blocked by the stop sheet; the elastic piece part is arranged on the main sheet body; the two sides of one end of the armature, which is matched with the knife edge, are respectively provided with a limiting block, the two limiting blocks are respectively provided with a yielding gap, and the limiting blocks enter the fixing part through the yielding gap and are prevented from yielding gaps and are blocked by the limiting blocks by moving along with the armature in the opposite direction of the sleeving direction of the fixing part.

12. The electromagnetic relay of claim 9, 10 or 11 wherein the reduced footprint: a pushing arm extending along the direction from one end of the armature far away from the knife edge to one end of the armature matched with the knife edge is arranged at one end of the armature matched with the knife edge; the fixed part is provided with a limiting piece extending to one side close to the coil assembly along the thickness direction of the part where the knife edge of the yoke is located, and the limiting piece is matched with one side of the armature opposite to the yoke; the elastic piece part is arranged at one end of the limiting piece, facing the pushing arm, and is propped against one surface of the pushing arm, opposite to the yoke iron; the pushing arm penetrates through the abdication hole arranged on the fixing part, and the abdication hole extends to the limit piece.

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