An electromagnetic relay

Abstract

The present invention discloses an electromagnetic relay, which includes a base, a magnetic circuit part, a contact part, and a push card. The magnetic circuit part includes a bobbin, an enameled wire, an iron core, and an armature. The bobbin is arranged on the base, the iron core is installed in the bobbin, and the enameled wire is wound outside the bobbin. The contact part includes a moving reed and a static reed installed on the base; the armature stands on the base swingably and is connected to the moving reed through the push card; an insulating elastic limiting part is arranged on the base, and the elastic limiting part is located on the side of the armature away from the iron core and prevents the armature from detaching from the base. The present invention enables no plastic chips or iron chips to be generated during the process of loading the armature, ensures the quality of the product, and can cancel the compression spring, thereby reducing costs and increasing the creepage distance between the input end and the output end of the relay.

Description

Technical Field

[0001] The invention relates to an electromagnetic relay. Background Art

[0002] An electromagnetic relay in the prior art, whose magnetic circuit part includes a winding frame, enameled wire, an iron core, an armature, and a compression spring. The winding frame is arranged on the base of the relay, the iron core is installed in the winding frame, the enameled wire is wound outside the winding frame, one end of the armature is installed in the base, and two limit platforms are arranged on the base. The two limit platforms are located on both sides of the width direction of the armature and are interference fit with the armature. At the same time, the base is equipped with a compression spring on one side of the armature, and the compression spring supports the armature. In order to ensure that the armature does not fall out of the base, the interference of the limit platform is generally large. However, since the limit platform of the base has no elasticity, it is easy to squeeze plastic chips out of the base or rub iron chips out of the pole surface of the iron core during the assembly process of the armature, thereby affecting the quality of the product. In addition, since the armature is supported by a compression spring, not only the cost of the compression spring parts is increased, but also because the compression spring is made of metal, the creepage distance between the input and output ends of the relay will be reduced. Summary of the invention

[0003] The present invention aims at solving the technical problems existing in the prior art and provides an electromagnetic relay which can improve product quality, reduce cost and increase creepage distance.

[0004] The technical solution adopted by the present invention to solve its technical problems is: an electromagnetic relay, including a base, a magnetic circuit part, a contact part, and a push card. The magnetic circuit part includes a winding frame, an enameled wire, an iron core and an armature. The winding frame is arranged on the base, the iron core is installed in the winding frame, and the enameled wire is wound outside the winding frame. The contact part includes a moving spring and a static spring installed on the base; the armature can stand on the base in a swingable manner and is connected to the moving spring through the push card; an insulating elastic limiting part is arranged on the base, and the elastic limiting part is located on the side of the armature away from the iron core and prevents the armature from separating from the base.

[0005] Furthermore, the base is provided with a first slot for inserting the bottom end of the armature. During the process of inserting the bottom end of the armature into the first slot, the elastic limiting portion provides clearance for the bottom end of the armature through elastic deformation. After the bottom end of the armature is inserted into place, the elastic limiting portion restores.

[0006] Furthermore, the elastic limiting portion is an elastic retaining wall arranged along the width direction of the base and can elastically swing along the length direction of the base. The side of the elastic retaining wall is provided with a protrusion facing the armature, and the protrusion abuts against one end of the armature when one end of the armature is installed into the base.

[0007] Furthermore, the elastic retaining wall is provided with at least one opening groove, which divides the elastic retaining wall into at least two parts distributed along the width direction of the base, and each part is provided with the convex part.

[0008] Furthermore, the two ends of the elastic retaining wall in the width direction of the base are respectively connected to the side walls arranged on the edge of the base; the number of the opening groove is one, which divides the elastic retaining wall into the two parts, and the adjacent end sides of the two parts are respectively provided with the protrusions; the top of the protrusion is provided with a chamfer towards the end of the armature.

[0009] Furthermore, the iron core is U-shaped, and its two ends are respectively facing the armature; a locking portion is provided at the bottom end of the armature, and the locking portion is locked under the end where the pole surface edge of the iron core is located; a swing space for the armature is formed between the end where the pole surface edge of the iron core is located and the elastic limiting portion, and the width of the swing space is smaller than the width of the first slot.

[0010] Furthermore, the clamping portion is a clamping platform, which is located on the bottom side of the armature and close to the iron core.

[0011] Furthermore, the elastic limiting portion and the base are integrally injection molded.

[0012] Furthermore, a first groove is provided on the base at a side of the elastic limiting portion away from the armature, and / or a second groove is provided at a portion of the push card between its two ends.

[0013] Furthermore, a second slot and a third slot are provided on the base, the bottom of the dynamic spring is inserted in the second slot, and the bottom of the static spring is inserted in the third slot; the winding frame and the base are integrally injection molded.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Since the base of the present invention is provided with the insulating elastic limiting part on the side of the armature away from the iron core, the present invention can use the elastic deformation of the elastic limiting part to provide clearance for the armature during the process of installing the armature into the base, so that plastic chips and iron chips will not be generated due to mutual scraping, thereby ensuring the quality of the product; on the other hand, after the armature is installed into the base, the elastic limiting part limits the armature to prevent the armature from falling out of the base, so the original compression spring parts can be eliminated, thereby reducing costs and increasing the creepage distance between the input end and the output end of the relay.

[0016] 2. After the bottom end of the armature is installed in place, the elastic limiting part is restored, so that the elastic limiting part can realize the chipless assembly of the armature and the limiting function of the armature under a relatively small elastic deformation capacity, that is, the elastic limiting part has a low elastic deformation capacity requirement, making the elastic limiting part easier to process. In particular, the elastic limiting part is integrally injection molded with the base, so that the elastic limiting part does not need to be installed.

[0017] 3. The elastic limiting part is preferably the elastic retaining wall, which can ensure greater strength of the elastic limiting part. The arrangement of the breaking slot helps to improve the elasticity of the elastic retaining wall.

[0018] 4. The arrangement of the first groove / second groove can further increase the creepage distance between the input end and the output end of the relay.

[0019] 5. A swinging space for the armature is formed between the end where the iron core pole face edge is located and the elastic retaining wall. The width of this swinging space is smaller than the width of the first slot, which not only allows the armature to swing freely during the working state but also ensures that the bottom end of the armature and its clamping platform will not come out during subsequent use.

[0020] The present invention will be further described in detail below in conjunction with the drawings and embodiments; however, an electromagnetic relay of the present invention is not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is an exploded schematic view of the present invention;

[0022] Figure 2 is a three-dimensional structural schematic view of the base of the present invention;

[0023] Figure 3 is a top view of the base of the present invention;

[0024] Figure 4 is a three-dimensional structural schematic view of the present invention;

[0025] Figure 5 is an assembly schematic of the armature of the present invention Figure 1 ;

[0026] Figure 6 is an assembly schematic of the armature of the present invention Figure 2 ;

[0027] Figure 7 is an assembly schematic of the armature of the present invention Figure 3 . Detailed Embodiments

[0028] For the embodiments, please refer to Figures 1-7As shown in the figure, an electromagnetic relay of the present invention includes a base 1, a magnetic circuit part, a contact part, and a push card 7. The magnetic circuit part includes a bobbin 10, an enameled wire 4, an iron core 2, and an armature 3. The bobbin 10 is arranged on the base 1. Specifically, the bobbin 10 and the base 1 are integrally injection-molded. The iron core 2 is installed in the bobbin 10, and the enameled wire 4 is wound outside the bobbin 10. The contact part includes a moving contact 5 and a static contact 6 installed on the base 1. The armature 3 is swingably erected on the base 1 and is connected to the moving contact 5 through the push card 7. An insulating elastic limiting part is arranged on the base 1. The elastic limiting part is located on the side of the armature 3 away from the iron core 2 and prevents the armature 3 from detaching from the base 1.

[0029] In this embodiment, the elastic limiting part and the base 1 are integrally injection-molded. The base 1 is provided with a first slot 11 for the bottom end of the armature 3 to be inserted into. The first slot 11 is located between the elastic limiting part and the iron core 2. During the process of the bottom end of the armature 3 being inserted into the first slot 11, the elastic limiting part provides a yield through elastic deformation to the bottom end of the armature 3. After the bottom end of the armature 3 is inserted in place, the elastic limiting part resumes its original state.

[0030] In this embodiment, the elastic limiting part is an elastic retaining wall 12 arranged along the width direction of the base 1 and elastically swingable along the length direction of the base 1. A convex part facing the armature 3 is provided on the side surface of the elastic retaining wall 12. The convex part abuts against one end of the armature 3 during the process of the armature 3 being installed on the base 1. A chamfer is provided at the top end of the convex part facing the armature 3 to provide guidance for one end of the armature 3. The convex part is specifically a protrusion 121, but it is not limited thereto. In other embodiments, the convex part is a convex rib arranged along the width direction of the base, etc.

[0031] In this embodiment, both ends of the elastic retaining wall 12 in the width direction of the base 1 are respectively connected to the side walls arranged at the edges of the base 1, thereby improving the strength of the elastic retaining wall 12. An opening slot 122 (the number of the opening slots 122 is not limited to one) is provided in the middle of the elastic retaining wall 12. The opening slot 122 divides the elastic retaining wall 12 into two parts distributed along the width direction of the base 1. The two parts are respectively provided with the protrusions 121. Specifically, the adjacent end side surfaces of the two parts are respectively provided with the protrusions 121.

[0032] In this embodiment, the base 1 is provided with a first groove 13 on the side of the elastic limiting portion (i.e., the elastic retaining wall 12) away from the armature 3, and the two ends of the first groove 13 in the width direction of the base 1 extend to the side walls provided at the edge of the base 1. The push card 7 is provided with a second groove 71 at the position between its two ends, and the second groove 71 is specifically located on the bottom surface of the push card 7, and the number of the second grooves 71 is at least two, and the at least two second grooves 71 are distributed along the length direction of the push card 7. The provision of the first groove 13 and the second groove 71 can increase the creepage distance between the input end and the output end of the relay.

[0033] In this embodiment, the iron core 2 is U-shaped, and its two ends are respectively facing the armature 3; a locking portion is provided at the bottom end of the armature 3, and the locking portion is locked under the end where the pole surface edge of the iron core 2 is located; a swing space for the armature 3 is formed between the end where the pole surface edge of the iron core 2 is located and the elastic limiting portion (that is, the elastic retaining wall 12), and the width of the swing space is smaller than the width of the first slot 11, and also smaller than the maximum width of the bottom end of the armature 3.

[0034] In this embodiment, the clamping portion is a clamping platform 31 , which is located on a side surface of one end of the armature 3 and close to the U-shaped iron core 2 .

[0035] In this embodiment, the winding frame 10 is located at one end of the base 1 in the length direction, and the other end of the base 1 in the length direction is provided with a second slot 14 and a third slot 15. The bottom of the dynamic spring 5 is inserted in the second slot 14, and the bottom of the static spring 6 is inserted in the third slot 15.

[0036] When assembling an electromagnetic relay of the present invention, firstly, the iron core 2 is installed in the winding frame 10, and then the enameled wire 4 is wound. Then, the bottom end of the armature 3 is aligned with the first slot 11 and inserted downward into the first slot 11, as shown in FIG. Figure 5 As shown, during the process of inserting the bottom end of the armature 3 into the first slot 11, an interference fit is formed between the bottom end of the armature 3 and the clamping table 31 thereon, the iron core 2 and the base 1, and the elastic retaining wall 12 is pushed by the bottom end of the armature 3 to the side away from the armature 3 and elastically deforms, as shown in FIG. Figure 6 As shown, the interference between the three is reduced, so that the bottom end of the armature 3 will not produce plastic chips and iron chips due to mutual scraping during the installation process. After the bottom end of the armature 3 is installed in place, the elastic retaining wall 12 is restored, as shown in FIG. Figure 7 At this time, a swing space for the armature 3 is formed between the end where the pole face edge of the core 2 is located and the elastic retaining wall 12, and the swing space is smaller than the maximum width of the bottom end of the armature 3 (i.e., the distance between the tail end of the clamping platform 31 of the armature 3 and a side of the armature away from the U-shaped core), which not only allows the armature 3 to swing freely in the working state, but also ensures that the bottom end of the armature 3 and its clamping platform 31 will not fall out during subsequent use.

[0037] An electromagnetic relay of the present invention has a design of an elastic retaining wall 12 on a base 1. During the insertion process of an armature 3, the elastic retaining wall 12 reduces the interference fit amount among the three parts of the armature 3, the base 1, and a U-shaped iron core 2 through elastic deformation, reducing plastic chips and iron chips generated by mutual scratching between the parts, thereby improving the product quality. After the bottom end of the armature 3 is inserted into the base 1, the elastic retaining wall 12 cooperates with the iron core 2 to limit the bottom end of the armature 3 and a snap table 31 thereon. Therefore, the original compression spring part can be cancelled, thereby reducing costs and increasing the creepage distance between the input end and the output end of the relay.

[0038] For an electromagnetic relay of the present invention, the parts not involved are the same as or can be implemented by the prior art.

[0039] In other embodiments, the magnetic circuit system is horizontal and includes a yoke.

[0040] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay, comprising a base, a magnetic circuit part, a contact part, and a pushing card. The magnetic circuit part includes a bobbin, an enameled wire, an iron core, and an armature. The bobbin is arranged on the base, the iron core is installed in the bobbin, and the enameled wire is wound outside the bobbin. The contact part includes a moving reed and a static reed installed on the base; the armature stands on the base swingably and is connected to the moving reed through the pushing card; and it is characterized in that: An insulating elastic limiting part is arranged on the base. The elastic limiting part is located on the side of the armature away from the iron core and prevents the armature from detaching from the base. The base is provided with a first slot for the bottom end of the armature to be inserted into. During the process of the bottom end of the armature being inserted into the first slot, the elastic limiting part provides a space for yielding to the bottom end of the armature through elastic deformation. After the bottom end of the armature is inserted in place, the elastic limiting part resumes its original state. The elastic limiting part is an elastic retaining wall arranged along the width direction of the base and capable of elastically swinging along the length direction of the base. The elastic retaining wall is provided with at least one breaking slot, which divides the elastic retaining wall into at least two parts distributed along the width direction of the base. The elastic limiting part and the base are integrally injection-molded.

2. The electromagnetic relay according to claim 1, characterized in that: The side surface of the elastic retaining wall is provided with a convex part facing the armature, and the convex part abuts against one end of the armature during the process of one end of the armature being inserted into the base.

3. The electromagnetic relay according to claim 2, characterized in that: Each part of the elastic retaining wall is provided with the convex part.

4. The electromagnetic relay according to claim 3, wherein: The two ends of the elastic retaining wall in the width direction of the base are respectively connected to the side walls arranged at the edges of the base. The number of the breaking slots is one, which divides the elastic retaining wall into the two parts. The adjacent end side surfaces of the two parts are respectively provided with the convex parts. The top of the convex part is provided with a chamfer at the end facing the armature.

5. The electromagnetic relay according to claim 1, wherein: The iron core is U-shaped, and its two ends respectively face the armature. The bottom end of the armature is provided with a clamping part, and the clamping part is clamped under the end where the edge of the iron core pole face is located. A swinging space of the armature is formed between the end where the edge of the iron core pole face is located and the elastic limiting part, and the width of the swinging space is smaller than the width of the first slot.

6. The electromagnetic relay according to claim 5, characterized in that: The clamping part is a clamping platform, which is located on the side surface of the bottom end of the armature and close to the iron core.

7. The electromagnetic relay according to claim 1, characterized in that: A first groove is arranged on the base on the side of the elastic limiting part away from the armature, and / or a second groove is arranged at the part between the two ends of the push card.

8. The electromagnetic relay according to claim 1, characterized in that: The base is provided with a second slot and a third slot. The bottom end of the moving reed is inserted into the second slot, and the bottom end of the static reed is inserted into the third slot. The winding frame and the base are integrally injection-molded.

Images