Electromagnetic relay

Abstract

The invention relates to an electromagnetic relay which comprises an armature assembly, a static spring assembly, a movable spring assembly, a pushing card and a permanent magnet. The static spring assembly comprises a static reed and a static contact arranged on the static reed. The movable spring assembly comprises a movable reed and a movable contact arranged on the movable reed. The pushing card is connected with the armature assembly and the movable contact spring. The pushing card can push the movable contact spring so that the movable contact and the static contact can be contacted or disconnected. And the permanent magnet is arranged on the pushing card and corresponds to the static contact and / or the movable contact, and a magnetic field formed by the permanent magnet is used for realizing arc extinguishing. Under the action of the pushing card, the permanent magnet can be always close to the arcing point to the limit, so that the magnetic field intensity acting on the arcing point is relatively strong, the arc extinguishing effect is better, the permanent magnet with the same magnetic efficiency can be smaller and lighter, the weight of the pushing card is reduced, the power consumption of the coil is reduced, miniaturization is facilitated, and the cost is reduced. As the permanent magnet can move along with the pushing card, the permanent magnet does not need to cover the static contact and the movable contact, thereby being beneficial to reducing the size and reducing the weight.

Description

Technical Field

[0001] The present application relates to the technical field of relays, and in particular to an electromagnetic relay. Background Art

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is often used in automatic control circuits. Relays play the role of automatic adjustment, safety protection and conversion circuits in automatic control circuits.

[0003] The relay includes a static reed and a moving reed. When the static contact on the static reed is disconnected from the moving contact on the moving reed, an arc is usually generated. The arc easily burns the surface of the static contact and the moving contact. At the same time, in the absence of arc initiation, the arc will run wild and cause the relay to fail. In order to increase the service life of the relay, the relay is equipped with an arc-blowing permanent magnet. The magnetic field formed by the arc-blowing permanent magnet will lengthen the arc and extinguish the arc. However, common relays have poor arc blowing effects and are large in size. Summary of the invention

[0004] Based on this, it is necessary to provide an electromagnetic relay to avoid the increase in the size of the relay.

[0005] An electromagnetic relay, comprising:

[0006] Armature assembly;

[0007] A static spring assembly, the static spring assembly comprising a static spring sheet and a static contact point provided on the static spring sheet;

[0008] A dynamic spring assembly, the dynamic spring assembly comprising a dynamic spring sheet and a dynamic contact point provided on the dynamic spring sheet, the dynamic contact point being arranged opposite to the static contact point;

[0009] A push card, the push card is connected to the armature assembly and the movable reed, and the push card can push the movable reed to make the movable contact contact and disconnect with the static contact; and

[0010] A permanent magnet is disposed on the push card, the permanent magnet corresponds to the static contact and / or the moving contact, and the magnetic field formed by the permanent magnet is used for arc extinguishing.

[0011] The above-mentioned electromagnetic relay, by arranging a permanent magnet in the push card, the permanent magnet corresponds to the static contact and / or the moving contact, so that under the action of the push card, the permanent magnet can always be extremely close to the static contact and the moving contact, that is, the permanent magnet can always be extremely close to the arc starting point, so that the magnetic field intensity acting on the arc starting point is stronger, the arc extinguishing effect is better, and the permanent magnet with the same magnetic efficiency can be smaller and lighter, reducing the weight of the push card, reducing the power consumption of the coil, and being conducive to miniaturization and reducing costs. Since the permanent magnet is arranged inside the electromagnetic relay and is located at the push card, there is no need to set up an additional space for placing the permanent magnet, which is also conducive to miniaturization, and there is no need to change other structures of the electromagnetic relay, and it has strong versatility. In addition, since the permanent magnet can move with the push card, the permanent magnet does not need to cover the static contact and the moving contact, which is conducive to reducing the volume and reducing the weight.

[0012] In one embodiment, the permanent magnet is arranged opposite to the static contact and / or the moving contact, so that the arc extinguishing effect is better.

[0013] In one embodiment, the push card has a first end and a second end opposite to each other, the first end is connected to the armature assembly, the second end is connected to the movable spring piece, the permanent magnet is arranged at the second end, and the permanent magnet and the movable spring piece are arranged at intervals.

[0014] In one of the embodiments, the push card is provided with a receiving groove, and the permanent magnet is fixed in the receiving groove.

[0015] In one embodiment, the push card further includes an anti-slip structure, which is disposed in the receiving slot and is used to fix the permanent magnet. Under the action of the anti-slip structure, the permanent magnet can be fixed in the receiving slot to prevent the permanent magnet from escaping from the receiving slot, thereby ensuring the arc extinguishing effect.

[0016] In one embodiment, the anti-drop structure includes an anti-drop buckle, at least two of which are provided, all of which are provided on the slot wall of the receiving slot, and all of which are buckled on one side of the permanent magnet close to the slot opening of the receiving slot. In this way, the convenience and reliability of permanent magnet assembly can be improved.

[0017] In one embodiment, the anti-slip structure includes an anti-slip buckle and an anti-slip cover plate, wherein the anti-slip buckle and the anti-slip cover plate are respectively arranged on two opposite groove walls of the receiving groove, and there is a gap between the anti-slip buckle and the anti-slip cover plate for the permanent magnet to be inserted, and the anti-slip buckle is buckled on the side of the permanent magnet close to the notch of the receiving groove, and the anti-slip cover plate is arranged on the side of the permanent magnet close to the notch of the receiving groove. In this way, the anti-slip buckle cooperates with the anti-slip cover plate to fix the permanent magnet in the receiving groove to prevent the permanent magnet from escaping from the receiving groove, thereby ensuring the arc extinguishing effect, and at the same time, it can also avoid the risk of permanent magnets being fixed by glue due to aging of glue and other risks, thereby improving the reliability of permanent magnet assembly. In addition, it is only necessary to control the interference on one side to reduce the risk of failure of the anti-slip buckle.

[0018] In one embodiment, a through hole is provided at the bottom of the receiving groove, and the through hole is provided corresponding to the anti-detachment cover plate. When the permanent magnet is obliquely assembled in the receiving groove, the through hole is provided for one end of the permanent magnet to be inserted. In this way, on the one hand, it is convenient for demoulding; on the other hand, when the permanent magnet is obliquely assembled in the receiving groove, one end of the permanent magnet can be extended into the through hole, avoiding the interference of the anti-detachment cover plate with the permanent magnet, reducing the deformation of the anti-detachment buckle, and thus helping to reduce the risk of failure of the anti-detachment buckle.

[0019] In one embodiment, the anti-slip structure includes a fixing member, the fixing member includes a mounting arm and a cover plate portion, the mounting arm is arranged between the permanent magnet and the groove wall of the receiving groove, the opposite sides of the mounting arm are respectively connected to the two opposite groove walls of the receiving groove in a one-to-one correspondence, the cover plate portion is connected to the mounting arm, and the cover plate portion is arranged on one side of the permanent magnet close to the groove opening of the receiving groove. In this way, the cover plate portion plays a role of limiting, so as to limit the permanent magnet in the receiving groove, prevent the permanent magnet from escaping from the receiving groove, and improve the reliability of the permanent magnet assembly.

[0020] In one embodiment, anti-retraction teeth are provided on opposite sides of the mounting arm, and the anti-retraction teeth are interference-fitted with the groove wall of the receiving groove, so as to improve the reliability of the fixing member assembly.

[0021] In one embodiment, the bottom of the receiving groove is provided with two through holes, and the two through holes are respectively provided on both sides of the bottom of the receiving groove along the arrangement direction of the static spring assembly and the dynamic spring assembly; the fixing members are provided with two, and the mounting arms of the two fixing members are respectively provided in the two through holes in a one-to-one correspondence, and the mounting arm of one of the fixing members is provided on one side of the static contact and the dynamic contact, and the mounting arm of the other fixing member is provided on the other side of the static contact and the dynamic contact. In this way, the mounting arm can block the arc and prevent the arc from hitting the plastic member.

[0022] In one embodiment, the permanent magnet has a first polarity and a second polarity, and the first polarity and the second polarity are respectively located at two ends of the permanent magnet along the depth direction of the receiving groove, so that the arc blowing direction is left and right, and the arc will not hit the push card, which can prevent the push card from being melted by the arc, thereby preventing product failure. Alternatively, the first polarity and the second polarity are respectively located at two ends of the permanent magnet along the length direction of the receiving groove, and the length direction of the receiving groove is perpendicular to the arrangement direction of the static spring assembly and the dynamic spring assembly.

[0023] In one embodiment, the static spring assembly further includes a magnetic conductive member, and the magnetic conductive member is disposed on the static spring sheet. In this way, the magnetic conductive member can play a role in magnetic concentration, increase the magnetic flux lines from the N pole of the permanent magnet back to the S pole, reduce magnetic loss, and ensure arc extinguishing effect.

[0024] In one embodiment, the electromagnetic relay further includes an arc-blocking member, the arc-blocking member includes a first arc-blocking portion and a second arc-blocking portion opposite to each other, the first arc-blocking portion is provided on one side of the static spring assembly and the dynamic spring assembly along the arrangement direction of the two, and the second arc-blocking portion is provided on the other side of the static spring assembly and the dynamic spring assembly along the arrangement direction of the two. In this way, the first arc-blocking portion and the second arc-blocking portion can block the arc and prevent the arc from hitting the plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of an electromagnetic relay according to one embodiment of the present application.

[0026] Figure 2 A partial structural diagram of an electromagnetic relay according to an embodiment of the present application.

[0027] Figure 3 This is a schematic structural diagram of an electromagnetic relay according to another embodiment of the present application.

[0028] Figure 4 for Figure 3 Right side view of the electromagnetic relay shown.

[0029] Figure 5 for Figure 3 The schematic diagram of the structure after the push card and the permanent magnet are assembled is shown.

[0030] Figure 6 for Figure 5 The top view of the push card and permanent magnet after assembly is shown.

[0031] Figure 7 for Figure 5 The schematic diagram of the structure of the push card is shown.

[0032] Figure 8This is a schematic structural diagram of an electromagnetic relay according to another embodiment of the present application.

[0033] Fig. 9 for Figure 8 Sectional view along AA.

[0034] Fig.10 for Fig. 9 The structural schematic diagram shown is that the permanent magnet is obliquely assembled on the push card.

[0035] Fig.11 for Fig. 9 A top view of the push card is shown.

[0036] Fig.12 This is a schematic structural diagram of an electromagnetic relay according to another embodiment of the present application.

[0037] Fig.13 for Fig.12 Right side view of the electromagnetic relay shown.

[0038] Fig.14 for Fig.12 An exploded view of the push card and the fixings shown.

[0039] Fig.15 Schematic diagram of the structure of a static spring assembly according to an embodiment of the present application.

[0040] Fig.16 for Fig.15 The structural schematic diagram of the magnetic conductive component is shown.

[0041] Description of Figure Numbers:

[0042] 10. armature assembly; 11. armature; 20. static spring assembly; 21. static spring piece; 211. protrusion; 22. static contact; 23. magnetic conductive member; 231. main body; 2311. first connecting hole; 2312. avoidance groove; 232. first side wall; 233. second side wall; 30. dynamic spring assembly; 31. dynamic spring piece; 32. dynamic contact; 40. push card; 41. first end; 42. second end; 421. receiving groove; 4211 , through hole; 4212, accommodating groove; 422, anti-drop buckle; 4221, connecting arm; 4222, buckling part; 423, anti-drop cover; 424, fixing piece; 4241, mounting arm; 4242, cover part; 4243, anti-drop tooth; 50, permanent magnet; 51, first polarity; 52, second polarity; 60, arc blocking member; 61, first arc blocking part; 62, second arc blocking part; 63, connecting part; 70, coil; 80, yoke. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] See also Figure 2 An electromagnetic relay provided in one embodiment of the present application includes an armature assembly 10, a static spring assembly 20, a dynamic spring assembly 30 and a push card 40.

[0045] The static spring assembly 20 and the dynamic spring assembly 30 are arranged on the base, and the static spring assembly 20 and the dynamic spring assembly 30 are arranged along the first direction, and the first direction is represented by X. The static spring assembly 20 includes a static spring piece 21 and a static contact 22, and the dynamic spring assembly 30 includes a dynamic spring piece 31 and a dynamic contact 32, the static contact 22 is arranged on the side of the static spring piece 21 facing the dynamic spring piece 31, and the dynamic contact 32 is arranged on the side of the dynamic spring piece 31 facing the static spring piece 21, and the static contact 22 and the dynamic contact 32 are arranged opposite to each other.

[0046] It should be noted that the static contact 22 is integrally provided with the static reed 21, or the static contact 22 is separately provided and connected with the static reed 21. The moving contact 32 is integrally provided with the moving reed 31, or the moving contact 32 is separately provided and connected with the moving reed 31.

[0047] The push card 40 is arranged at the same end of the armature assembly 10 and the movable spring assembly 30. In the first direction, the push card 40 has a first end 41 and a second end 42 relative to each other. The first end 41 is connected to the armature assembly 10, and the second end 42 is connected to the movable spring piece 31. The push card 40 can push the movable spring assembly 30 to make the movable contact 32 contact or disconnect with the static contact 22.

[0048] Of course, in other embodiments, the armature assembly 10 and the movable spring 31 may also be connected to other positions of the push card 40 except the first end 41 and the second end 42 , and the present invention is not limited thereto.

[0049] In one embodiment, see Figure 2 The armature assembly 10 includes a permanent magnet (not shown) and two armatures 11. The permanent magnet is disposed between the two armatures 11 and is integrally formed with the outer plastic part. A push arm is formed on the plastic material, and the push arm is connected to the push card 40.

[0050] Furthermore, the electromagnetic relay also includes a coil 70 and a yoke 80. The yoke 80 is installed on the coil frame, the coil 70 is wound around the coil frame, and the yoke 80 cooperates with the armature to form a closed magnetic circuit. The armature assembly 10 rotates around the rotating shaft when the coil 70 is passed through a positive current or a reverse current to drive the moving spring 31 to move. Specifically, when the coil 70 is passed through a positive current, the armature assembly 10 rotates around the rotating shaft under the action of the magnetic force to push the push card 40 to move in the direction close to the static spring assembly 20, and the push card 40 pushes the moving spring assembly 30 to move in the direction close to the static spring assembly 20, so that the static contact 22 contacts the moving contact 32, thereby connecting the circuit. When the coil 70 is passed through a reverse current, the armature assembly 10 rotates around the rotating shaft in the opposite direction under the action of the magnetic force to push the push card 40 to move in the direction away from the static spring assembly 20, and the push card 40 pushes the moving spring assembly 30 to move in the direction away from the static spring assembly 20, and the static contact 22 is separated from the moving contact 32.

[0051] When the static contact 22 is disconnected from the moving contact 32, an arc will be generated between the static contact 22 and the moving contact 32, and the arc will burn the surface of the static contact 22 and the moving contact 32. At the same time, in the absence of arc ignition, the arc will run wild and cause product failure. Therefore, in this embodiment, the electromagnetic relay also includes a permanent magnet 50, and the permanent magnet 50 is arranged at the second end 42 of the push card 40, so that the arc generated between the static contact 22 and the moving contact 32 is forced to move under the action of the magnetic field formed by the permanent magnet 50, so that the arc is quickly elongated and the arc is extinguished, so that the arc can be prevented from burning the surface of the static contact 22 and the moving contact 32, and the arc can be prevented from running wild and causing product failure.

[0052] Of course, in other embodiments, the permanent magnet 50 may also be disposed at other positions of the push card 40 except the second end 42 , as long as the permanent magnet 50 corresponds to the static contact 22 and / or the movable contact 32 .

[0053] It should be noted that, see Figure 2 In this embodiment, although the connection position between the movable spring piece 31 and the push card 40 and the permanent magnet 50 are both located at the second end 42 of the push card 40, the movable spring piece 31 and the permanent magnet 50 are spaced apart. In this embodiment, the connection position between the push card 40 and the movable spring piece 31 is located between the permanent magnet 50 and the first end 41, and the connection position between the push card 40 and the movable spring piece 31 is close to the permanent magnet 50.

[0054] By setting the permanent magnet 50 on the push card 40, the permanent magnet 50 corresponds to the static contact 22 and / or the moving contact 32. Under the action of the push card 40, the permanent magnet 50 can be extremely close to the static contact 22 and the moving contact 32, that is, the permanent magnet 50 can be extremely close to the arc starting point, so that the magnetic field intensity acting on the arc starting point is stronger, the arc extinguishing effect is better, and the permanent magnet 50 with the same magnetic efficiency can be smaller and lighter, reducing the weight of the push card 40, reducing the power consumption of the coil, and being conducive to miniaturization and reducing costs. Since the permanent magnet 50 is arranged inside the electromagnetic relay and located at the push card 40, there is no need to set up an additional space for placing the permanent magnet 50, which is also conducive to miniaturization, and there is no need to change other structures of the electromagnetic relay, and it has strong versatility. Since the permanent magnet 50 can move with the push card 40, the permanent magnet 50 does not need to cover the static contact 22 and the moving contact 32, which is conducive to reducing the volume and reducing the weight.

[0055] In addition, since the permanent magnet 50 is disposed on the push card 40, the permanent magnet 50 can move with the push card 40, and the magnetic field of the permanent magnet 50 can change with the change of its position, that is, the magnetic field generated by the permanent magnet 50 can move with the arc, which can ensure that a strong magnetic field strength acts on the arc, which is conducive to improving the arc extinguishing effect. Since the position of the magnetic field generated by the permanent magnet 50 can change with the position of the permanent magnet 50, the direction of the arc will also shift with the translation, which can prevent the arc from always striking in the same direction and avoid concentrated ablation.

[0056] In one embodiment, see Figure 2 , the permanent magnet 50 is arranged opposite to the static contact 22, so that the permanent magnet 50 is located directly above the static contact 22. In this way, the arc extinguishing effect is better.

[0057] In other embodiments, the permanent magnet 50 is disposed opposite to the moving contact 32 so that the permanent magnet 50 is located directly above the moving contact 32. Alternatively, the permanent magnet 50 is disposed opposite to the stationary contact 22 and the moving contact 32 so that the permanent magnet 50 is located directly above the stationary contact 22 and the moving contact 32.

[0058] In one embodiment, see Figure 3 The second end 42 of the push card 40 is provided with a receiving groove 421, and the permanent magnet 50 is arranged in the receiving groove 421. It should be noted that the shape and size of the receiving groove 421 are adapted to the shape and size of the permanent magnet 50. Specifically, the permanent magnet 50 is a square body, and the receiving groove 421 is a square groove adapted to the size of the permanent magnet 50.

[0059] Furthermore, the second end 42 of the push card 40 is also provided with an anti-slip structure, which is used to fix the permanent magnet 50 in the receiving groove 421. In this way, under the action of the anti-slip structure, the permanent magnet 50 can be fixed in the receiving groove 421 to prevent the permanent magnet 50 from escaping from the receiving groove 421, thereby ensuring the arc extinguishing effect.

[0060] In one embodiment, see Figure 2 The anti-drop structure includes an anti-drop buckle 422. At least two anti-drop buckles 422 are provided, and all anti-drop buckles 422 are provided on the slot wall of the receiving slot 421. The anti-drop buckle 422 is buckled on one side of the permanent magnet 50 close to the slot of the receiving slot 421.

[0061] Optionally, all the anti-dropout buckles 422 are respectively arranged on the groove walls at both sides of the receiving groove 421 along the first direction; or, all the anti-dropout buckles 422 are respectively arranged on the groove walls at both ends of the receiving groove 421 along the first direction; or, all the anti-dropout buckles 422 are respectively arranged on all the groove walls of the receiving groove 421. In this way, the reliability of the assembly of the permanent magnet 50 can be improved.

[0062] In this embodiment, refer to Figure 5 There are two anti-dropping buckles 422 , and the two anti-dropping buckles 422 are arranged on the groove walls on both sides of the receiving groove 421 along the first direction.

[0063] In another embodiment, see Figure 8 and Fig. 9 The anti-drop structure includes an anti-drop buckle 422 and an anti-drop cover 423. The anti-drop buckle 422 and the anti-drop cover 423 are respectively arranged on two opposite groove walls of the receiving groove 421, and there is a gap between the anti-drop buckle 422 and the anti-drop cover 423 for the permanent magnet 50 to be inserted. The anti-drop buckle 422 is buckled on one side of the permanent magnet 50 close to the notch of the receiving groove 421, and the anti-drop cover 423 is covered on one side of the permanent magnet 50 close to the notch of the receiving groove 421.

[0064] It should be noted that the number of the anti-drop buckles 422 can be set according to actual needs. Optionally, there is one, two, or more than three anti-drop buckles 422, but it is not limited thereto.

[0065] See also Fig. 9 and Fig.10During installation, the permanent magnet 50 is installed in the receiving groove 421 in an oblique assembly manner. Specifically, the first end of the permanent magnet 50 is arranged outside the receiving groove 421, and the second end of the permanent magnet 50 is inserted obliquely downward from the notch of the receiving groove 421 into the receiving groove 421, so that the second end of the permanent magnet 50 is located below the anti-detachment cover plate 423. Among them, the first end and the second end of the permanent magnet 50 are respectively the two ends of the permanent magnet 50 along the length direction of the receiving groove 421, wherein the length direction of the receiving groove 421 is perpendicular to the first direction. Then, the first end of the permanent magnet 50 is pressed downward, and the first end of the permanent magnet 50 moves toward the direction close to the bottom of the receiving groove 421, and the second end of the permanent magnet 50 moves toward the direction close to the notch of the receiving groove 421. After the permanent magnet 50 is assembled in the receiving groove 421, the permanent magnet 50 fits with the bottom of the receiving groove 421, and the anti-detachment buckle 422 is buckled on the side of the permanent magnet 50 close to the notch of the receiving groove 421, and the anti-detachment cover plate 423 is covered on the side of the permanent magnet 50 close to the notch of the receiving groove 421. In this way, the anti-detachment buckle 422 cooperates with the anti-detachment cover plate 423 to fix the permanent magnet 50 in the receiving groove 421, prevent the permanent magnet 50 from detaching from the receiving groove 421, ensure the arc extinguishing effect, and at the same time avoid the risk of the permanent magnet 50 being fixed by glue due to the aging of the glue, thereby improving the reliability of the assembly of the permanent magnet 50. In addition, it is only necessary to control the interference on one side to reduce the risk of failure of the anti-detachment buckle 422.

[0066] Optionally, the anti-dropout buckle 422 and the anti-dropout cover plate 423 are respectively arranged on the groove walls at both sides of the receiving groove 421 along the first direction. Alternatively, the anti-dropout buckle 422 and the anti-dropout cover plate 423 are respectively arranged on the groove walls at both ends of the receiving groove 421 along the first direction.

[0067] In this embodiment, refer to Fig.11 The anti-dropping buckle 422 and the anti-dropping cover plate 423 are respectively arranged on the groove walls on both sides of the receiving groove 421 along the first direction.

[0068] Further, see Fig.10 and Fig.11 , a through hole 4211 is provided at the bottom of the receiving groove 421, and the through hole 4211 is provided corresponding to the anti-detachment cover plate 423. It can be understood that the through hole 4211 is provided below the anti-detachment cover plate 423. When the permanent magnet 50 is obliquely assembled in the receiving groove 421, the through hole 4211 is provided for one end of the permanent magnet 50 to be inserted. In this way, by providing the through hole 4211 at the bottom of the receiving groove 421, on the one hand, it is conducive to demoulding; on the other hand, in the process of obliquely assembling the permanent magnet 50 in the receiving groove 421, one end of the permanent magnet 50 can be extended into the through hole 4211, avoiding the interference of the anti-detachment cover plate 423 on the permanent magnet 50, reducing the deformation of the anti-detachment buckle 422, and thus helping to reduce the risk of failure of the anti-detachment buckle 422.

[0069] In one embodiment, see Figure 7 and Fig.10 The groove wall of the receiving groove 421 is provided with a receiving groove 4212 , and the anti-drop buckle 422 is arranged in the receiving groove 4212 .

[0070] Further, see Figure 7 and Fig.10 The anti-drop buckle 422 includes a connecting arm 4221 and a buckling portion 4222. One end of the connecting arm 4221 is connected to the bottom of the receiving groove 4212, and the connecting arm 4221 extends from the bottom of the receiving groove 4212 toward the notch of the receiving groove 4212, and there is a gap between the connecting arm 4221 and the groove wall of the receiving groove 4212. The buckling portion 4222 is provided at one end of the connecting arm 4221 close to the notch of the receiving groove 4212. During installation, the buckling portion 4222 buckles on one side of the permanent magnet 50 close to the notch of the receiving groove 421, thereby fixing the permanent magnet 50 in the receiving groove 421.

[0071] During the process of assembling the permanent magnet 50 into the receiving groove 421, the anti-detachment buckle 422 will be deformed. By arranging the anti-detachment buckle 422 in the receiving groove 4212 and providing a gap between the anti-detachment buckle 422 and the groove wall of the receiving groove 4212, the deformation of the anti-detachment buckle 422 will not be interfered with. That is, the receiving groove 4212 provides sufficient space for the anti-detachment buckle 422 to deform, thereby ensuring that the anti-detachment buckle 422 can be buckled onto the permanent magnet 50.

[0072] In one embodiment, see Figure 1 , Figure 2 and Figure 3 , the electromagnetic relay further includes an arc-blocking member 60. The arc-blocking member 60 includes a first arc-blocking portion 61 and a second arc-blocking portion 62 opposite to each other, the first arc-blocking portion 61 being arranged on one side of the static contact 22 and the moving contact 32, and the second arc-blocking portion 62 being arranged on the other side of the static contact 22 and the moving contact 32. By respectively arranging the first arc-blocking portion 61 and the second arc-blocking portion 62 on both sides of the static contact 22 and the moving contact 32 along the first direction, the first arc-blocking portion 61 and the second arc-blocking portion 62 can block the arc and prevent the arc from hitting the plastic part.

[0073] Optionally, see Figure 3 The first arc blocking portion 61 and the second arc blocking portion 62 are both arc blocking blocks, and the two arc blocking blocks are independent of each other and arranged opposite to each other.

[0074] Optionally, see Figure 1 and Figure 2 The arc-blocking member 60 further includes a connecting portion 63. The connecting portion 63 is disposed on a side of the stationary spring piece 21 away from the movable spring piece 31, one side of the connecting portion 63 is connected to the first arc-blocking portion 61, and the other side of the connecting portion 63 is connected to the second arc-blocking portion 62, so that the arc-blocking member 60 is disposed outside the stationary contact 22 and the movable contact 32.

[0075] In one embodiment, the arc-blocking member 60 is made of ceramics. Ceramics have good stability, insulation and high-voltage resistance. Of course, in other embodiments, the arc-blocking member 60 may also be made of other materials, not limited thereto.

[0076] In another embodiment, see Fig.12 The anti-slip structure includes a fixing member 424. Optionally, the fixing member 424 is an iron sheet, which not only fixes the permanent magnet 50, but also gathers magnetic flux, increases the magnetic flux from the N pole of the permanent magnet 50 back to the S pole, reduces magnetic loss, and ensures arc extinguishing effect. Further, two fixing members 424 are provided, and the two fixing members 424 are arranged opposite to each other.

[0077] Further, see Fig.12 and Fig.14 The fixing member 424 includes a mounting arm 4241 and a cover plate portion 4242. The mounting arm 4241 is disposed between the permanent magnet 50 and the groove wall of the receiving groove 421, and the opposite sides of the mounting arm 4241 are respectively connected to the opposite groove walls of the receiving groove 421 in a one-to-one correspondence. The cover plate portion 4242 is connected to the mounting arm 4241, and the cover plate portion 4242 covers one side of the permanent magnet 50 near the groove opening of the receiving groove 421.

[0078] During installation, the permanent magnet 50 is first placed in the receiving groove 421. Then, the mounting arm 4241 of the fixing member 424 is inserted between the permanent magnet 50 and the groove wall of the receiving groove 421, so that the cover plate portion 4242 covers the side of the permanent magnet 50 close to the notch of the receiving groove 421. In this way, the cover plate portion 4242 plays a role of limiting, so as to limit the permanent magnet 50 in the receiving groove 421, prevent the permanent magnet 50 from escaping from the receiving groove 421, and improve the reliability of the assembly of the permanent magnet 50.

[0079] Of course, in other embodiments, the permanent magnet 50 may be directly installed in the receiving groove 421 , and the permanent magnet 50 may be bonded to the groove wall and groove bottom of the receiving groove 421 by glue fixation, injection molding or other methods.

[0080] In one embodiment, see Fig.14 The mounting arm 4241 is provided with anti-retraction teeth 4243 on opposite sides thereof, and the anti-retraction teeth 4243 are interference-fitted with the groove wall of the receiving groove 421. In this way, the reliability of the assembly of the fixing member 424 can be improved.

[0081] In one embodiment, see Fig.12 and Fig.13The bottom of the receiving groove 421 is provided with two through holes, and the two through holes are respectively provided on both sides of the bottom of the receiving groove 421 along the first direction. Two fixing members 424 are provided, and the mounting arms 4241 of the two fixing members 424 are respectively provided in the two through holes, and the ends of the mounting arms 4241 of the two fixing members 424 that are away from the cover plate portion 4242 are respectively located on both sides of the static contact 22 and the movable contact 32 along the first direction. Since the mounting arms 4241 extend to both sides of the static contact 22 and the movable contact 32 along the first direction, the mounting arms 4241 can block the arc and prevent the arc from hitting the plastic member.

[0082] In one embodiment, the permanent magnet 50 has a first polarity 51 and a second polarity 52. ​​Optionally, the first polarity 51 is one of an N pole and an S pole, and the second polarity 52 is the other of the N pole and the S pole.

[0083] See also Figure 4 , the first polarity 51 and the second polarity 52 are respectively located at the two ends of the permanent magnet 50 along the depth direction of the receiving groove 421. Specifically, the side of the permanent magnet 50 with the first polarity 51 is close to the notch of the receiving groove 421, and the side of the permanent magnet 50 with the second polarity 52 is close to the bottom of the receiving groove 421. Figure 4 For example, if the first polarity 51 is the N pole and the second polarity 52 is the S pole, when the current direction between the static contact 22 and the moving contact 32 enters perpendicular to the paper, the arc blowing direction is to the left, and when the current direction between the static contact 22 and the moving contact 32 flows out perpendicular to the paper, the arc blowing direction is to the right, and T is used to represent the arc blowing direction; if the first polarity 51 is the S pole and the second polarity 52 is the N pole, when the current direction between the static contact 22 and the moving contact 32 enters perpendicular to the paper, the arc blowing direction is to the right, and when the current direction between the static contact 22 and the moving contact 32 flows out perpendicular to the paper, the arc blowing direction is to the left. It should be noted that the static reed 21 is connected to the positive pole and the moving reed 31 is connected to the negative pole. If the current direction enters perpendicular to the paper, it is a positive current, and if the current direction flows out perpendicular to the paper, it is a reverse current. In this way, no matter whether the static contact 22 and the movable contact 32 are connected with a forward current or a reverse current, the arc blowing direction is left and right, so that the arc will not reach the push card 40, thereby preventing the push card 40 from being melted by the arc and preventing product failure.

[0084] Of course, in other embodiments, see Fig.13 , the first polarity 51 and the second polarity 52 are respectively located at the two ends of the permanent magnet 50 along the length direction of the receiving groove 421, wherein the length direction of the receiving groove 421 is perpendicular to the first direction. It can be understood that the end of the permanent magnet 50 with the first polarity 51 is close to the groove wall of the receiving groove 421 on one side along the first direction, and the end of the permanent magnet 50 with the second polarity 52 is close to the groove wall of the receiving groove 421 on the other side along the first direction. Fig.13For example, if the left end of the permanent magnet 50 is the N pole and the right end of the permanent magnet 50 is the S pole, when the current direction between the static contact 22 and the moving contact 32 enters perpendicular to the paper, the arc blowing direction is downward, and when the current direction between the static contact 22 and the moving contact 32 flows out perpendicular to the paper, the arc blowing direction is upward; if the left end of the permanent magnet 50 is the S pole and the right end of the permanent magnet 50 is the N pole, when the current direction between the static contact 22 and the moving contact 32 enters perpendicular to the paper, the arc blowing direction is upward, and when the current direction between the static contact 22 and the moving contact 32 flows out perpendicular to the paper, the arc blowing direction is downward. In this way, no matter whether the static contact 22 and the moving contact 32 are connected in the forward direction or the reverse direction, the arc blowing direction is always in the up-down direction.

[0085] In one embodiment, see Fig.15 The static spring assembly 20 further includes a magnetic conductive member 23. The magnetic conductive member 23 is disposed on the static spring piece 21. In this way, the magnetic conductive member 23 can play a role in magnetic concentration, increase the magnetic flux lines from the N pole of the permanent magnet 50 back to the S pole, reduce magnetic loss, and ensure arc extinguishing effect.

[0086] In one embodiment, see Fig.15 and Fig.16 The magnetic conductive member 23 includes a main body 231. The main body 231 is fixed to the static spring piece 21. Optionally, the main body 231 is arranged on the side of the static spring piece 21 facing the dynamic spring piece 31. In this way, it is beneficial to improve the arc extinguishing effect and can also play a role in resisting short circuit.

[0087] Optionally, see Figure 1 , Fig.15 and Fig.16 The main body 231 is provided with a first connection hole 2311 . A protrusion 211 is provided on one side of the static spring piece 21 facing the dynamic spring piece 31 , and the protrusion 211 is engaged with the first connection hole 2311 .

[0088] Optionally, the main body 231 is provided with a first connection hole 2311, the static spring sheet 21 is provided with a second connection hole, and the first connection hole 2311 is connected to the second connection hole. Connectors are provided in the first connection hole 2311 and the second connection hole, and the connectors connect the magnetic conductive member 23 to the static spring sheet 21. The connectors are rivets or the like.

[0089] In one embodiment, see Fig.15 and Fig.16 The main body 231 is provided with an avoidance groove 2312. Specifically, the avoidance groove 2312 is an arc-shaped groove adapted to the static contact 22. During installation, the avoidance groove 2312 can avoid the static contact 22 to avoid interference between the main body 231 and the static contact 22.

[0090] Optionally, see Fig.16There are two avoidance grooves 2312, one of which is located on the side of the main body 231 close to the static contact 22, and the other avoidance groove 2312 is located on the side of the main body 231 away from the static contact 22. During installation, any one of the avoidance grooves 2312 can be located close to the static contact 22, which plays a role in preventing mistakes and is also conducive to improving the convenience of installing the magnetic conductive member 23.

[0091] In one embodiment, see Fig.16 , the main body 231 has a first side and a second side opposite to each other. The magnetic conductive member 23 also includes a first side wall 232 and a second side wall 233. The first side wall 232 is connected to the first side of the main body 231, and the first side wall 232 extends from the main body 231 in a direction away from the movable spring piece 31. The second side wall 233 is connected to the second side of the main body 231, and the second side wall 233 extends from the main body 231 in a direction away from the movable spring piece 31. In this way, the first side wall 232 and the second side wall 233 can contact the opposite sides of the static spring piece 21 respectively, thereby improving the reliability of the installation of the magnetic conductive member 23. At the same time, by providing the first side wall 232 and the second side wall 233, the magnetic concentration effect can be further improved, the magnetic flux lines from the N pole of the permanent magnet 50 back to the S pole can be further increased, the magnetic loss can be reduced, and the arc extinguishing effect can be ensured.

[0092] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0093] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0094] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0095] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0096] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0097] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An electromagnetic relay, characterized in that: include: Armature assembly; A static spring assembly, the static spring assembly comprising a static spring sheet and a static contact point provided on the static spring sheet; A dynamic spring assembly, the dynamic spring assembly comprising a dynamic spring sheet and a dynamic contact point provided on the dynamic spring sheet, the dynamic contact point being arranged opposite to the static contact point; A push card, the push card is connected to the armature assembly and the movable spring, and the push card can push the movable spring to make the movable contact contact or disconnect with the static contact; and A permanent magnet is disposed on the push card, the permanent magnet corresponds to the static contact and / or the moving contact, and the magnetic field formed by the permanent magnet is used for arc extinguishing.

2. The electromagnetic relay according to claim 1, characterized in that: The permanent magnet is arranged opposite to the static contact and / or the moving contact.

3. The electromagnetic relay according to claim 1, characterized in that: The push card has a first end and a second end opposite to each other, the first end is connected to the armature assembly, the second end is connected to the movable spring piece, the permanent magnet is arranged at the second end, and the permanent magnet and the movable spring piece are arranged at intervals.

4. The electromagnetic relay according to claim 1, characterized in that: The push card is provided with a receiving groove, and the permanent magnet is fixed in the receiving groove.

5. The electromagnetic relay according to claim 4, characterized in that: The push card further comprises an anti-slip structure, which is arranged in the receiving groove and is used to fix the permanent magnet.

6. The electromagnetic relay according to claim 5, characterized in that: The anti-drop structure comprises an anti-drop buckle, at least two of which are provided, all of which are arranged on the slot wall of the receiving slot, and all of which are buckled on one side of the permanent magnet close to the slot opening of the receiving slot.

7. The electromagnetic relay according to claim 5, characterized in that: The anti-dropout structure includes an anti-dropout buckle and an anti-dropout cover plate, wherein the anti-dropout buckle and the anti-dropout cover plate are respectively arranged on two opposite groove walls of the receiving groove, and there is a gap between the anti-dropout buckle and the anti-dropout cover plate for inserting the permanent magnet. The anti-dropout buckle is buckled on a side of the permanent magnet close to the groove opening of the receiving groove, and the anti-dropout cover plate is covered on a side of the permanent magnet close to the groove opening of the receiving groove.

8. The electromagnetic relay according to claim 7, characterized in that: A through hole is provided at the bottom of the receiving groove, and the through hole is arranged corresponding to the anti-detachment cover plate. When the permanent magnet is obliquely assembled in the receiving groove, one end of the permanent magnet is inserted into the through hole.

9. The electromagnetic relay according to claim 5, characterized in that: The anti-slip structure includes a fixing part, which includes a mounting arm and a cover plate portion. The mounting arm is arranged between the permanent magnet and the groove wall of the receiving groove, and the opposite sides of the mounting arm are respectively connected to the opposite two groove walls of the receiving groove in a one-to-one correspondence. The cover plate portion is connected to the mounting arm, and the cover plate portion covers the side of the permanent magnet close to the groove opening of the receiving groove.

10. The electromagnetic relay according to claim 9, characterized in that: Anti-retraction teeth are provided on opposite sides of the installation arm, and the anti-retraction teeth are interference-fitted with the groove wall of the receiving groove.

11. The electromagnetic relay according to claim 9, characterized in that: The bottom of the receiving groove is provided with two through holes, and the two through holes are respectively provided on both sides of the bottom of the receiving groove along the arrangement direction of the static spring assembly and the dynamic spring assembly; There are two fixing members, and the mounting arms of the two fixing members are respectively arranged in the two through holes in a one-to-one correspondence, wherein the mounting arm of one of the fixing members is arranged on one side of the static contact and the moving contact, and the mounting arm of the other fixing member is arranged on the other side of the static contact and the moving contact.

12. The electromagnetic relay according to any one of claims 4 to 11, characterized in that: The permanent magnet has a first polarity and a second polarity, and the first polarity and the second polarity are respectively located at two ends of the permanent magnet along the depth direction of the receiving groove; or, the first polarity and the second polarity are respectively located at two ends of the permanent magnet along the length direction of the receiving groove, and the length direction of the receiving groove is perpendicular to the arrangement direction of the static spring assembly and the dynamic spring assembly.

13. The electromagnetic relay according to any one of claims 1 to 11, characterized in that: The static spring assembly also includes a magnetic conductive part, and the magnetic conductive part is arranged on the static spring piece.

14. The electromagnetic relay according to any one of claims 1 to 11, characterized in that: The electromagnetic relay also includes an arc-blocking member, which includes a first arc-blocking portion and a second arc-blocking portion relative to each other. The first arc-blocking portion is arranged on one side of the static spring assembly and the dynamic spring assembly along the arrangement direction of the two, and the second arc-blocking portion is arranged on the other side of the static spring assembly and the dynamic spring assembly along the arrangement direction of the two.

Images