Electromagnetic relay

Abstract

The present invention discloses an electromagnetic relay, which comprises an electromagnetic system and a housing assembly. The housing assembly includes a housing and a test switch. A sunken groove is provided on the housing. The test switch is installed in the sunken groove and has an unlocking position, a test position and a locking position when sliding along the sunken groove. A first locking portion is provided in the sunken groove. The test switch is provided with a first locking portion cooperating with the first locking portion and a triggering portion cooperating with the armature of the electromagnetic system. When the test switch slides to the unlocking position, the first locking portion of the test switch is locked with the first locking portion, so that the triggering portion of the test switch cannot contact the armature. When the test switch slides to the test position or the locking position, the locking between the first locking portion and the first locking portion is released. The electromagnetic relay of the present invention has an anti-misoperation function. When the test switch is in the unlocked state, the first locking portion is engaged with the first locking portion, preventing the test switch from pressing down the armature to cause misoperation and improving the reliability of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly relates to an electromagnetic relay. Background Art

[0002] For existing electromagnetic relays and test switches, some relays adopt a test switch with a lid-lifting structure, but the assembly structure is relatively complex, requiring more than two parts, and can only be locked and unlocked, without a jog test function; some other relays adopt a slider switch structure, which has the functions of jog test, locking, and unlocking, but still requires more than two parts, with complex assembly and high cost; of course, some relays also adopt a test switch composed of one part with the functions of jog test, locking, and unlocking, but its jog test structure has no anti-misoperation function and is extremely prone to unnecessary functional abnormalities due to misoperation. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an electromagnetic relay with an anti-misoperation function and high reliability.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An electromagnetic relay includes an electromagnetic system and a housing assembly. The electromagnetic system includes an armature. The housing assembly includes a housing and a test switch. A sunken groove is provided on the housing. The test switch is installed in the sunken groove and has an unlocking position, a test position, and a locking position when sliding along the sunken groove. A first locking portion is provided in the sunken groove. The test switch is provided with a first locking portion cooperating with the first locking portion and a touching portion cooperating with the armature.

[0006] When the test switch slides to the unlocking position, the first locking portion of the test switch is locked with the first locking portion, so that the touching portion of the test switch cannot contact the armature. When the test switch slides to the test position or the locking position, the locking between the first locking portion and the first locking portion is released.

[0007] Preferably, the test switch includes a slider and an elastic piece. The slider is slidably matched with the side wall of the sunken groove. One end of the elastic piece is connected to the slider, and the other end of the elastic piece is a movable end. The movable end is provided with the touching portion and a second locking portion, and the second locking portion has a pressed inclined surface. A second locking buckle cooperating with the second locking portion is provided in the sunken groove, and the second locking buckle has a pressing inclined surface cooperating with the pressed inclined surface.

[0008] When the test switch slides to the locking position, the pressing inclined surface presses the pressed inclined surface of the elastic piece, so that the movable end of the elastic piece moves downward, and the touching portion on the movable end presses the armature downward accordingly. Finally, the second locking portion is locked with the second locking buckle.

[0009] Preferably, there is an adjustment gap between the second locking portion and the triggering portion.

[0010] Preferably, a test platform is further provided on the movable end of the elastic sheet. A test groove is provided on the test platform. The cover assembly further includes a buckle plate. An installation groove for installing the buckle plate is provided on the cover. The installation groove communicates the sunken groove with the outside of the cover. The sunken groove communicates the installation groove with the inside of the cover. A test port is provided on the buckle plate; when the test switch slides to the test gear position, the test groove is aligned with the test port.

[0011] Preferably, the unlocking gear position, the test gear position, and the locking gear position are arranged in sequence; one end of the second locking portion and the triggering portion are connected, and there is an adjustment gap between the other ends, forming a horizontally placed U-shaped structure; the test platform is an inverted L-shaped structure, the bottom end of the test platform is connected to the end of the U-shaped structure, the top end of the test platform extends leftward to form the first locking portion flush with the right part of the top end, and the test platform and the first locking portion form a T-shaped structure.

[0012] Preferably, the slider is provided with a pushing boss at the top, a sliding protrusion and a gear position elastic sheet on the side wall of the slider. A supporting boss for supporting the test switch is provided on the side wall of the sunken groove. A buckling platform and a gear position protrusion are further provided on the side wall of the sunken groove above the supporting boss. The sliding protrusion is stuck between the supporting boss and the buckling platform and can slide along the buckling platform. The gear position elastic sheet is sequentially provided with an unlocking groove, a test groove and a locking groove. The gear position protrusion cooperates with the unlocking groove, the test groove and the locking groove to form the unlocking gear position, the test gear position and the locking gear position.

[0013] Preferably, both ends of the gear position elastic sheet are respectively connected to the side wall of the slider. The unlocking groove, the test groove and the locking groove are provided on the outer side surface of the middle part of the gear position elastic sheet. There is an activity gap between the inner side surface of the middle part of the gear position elastic sheet and the side wall of the slider.

[0014] Preferably, it further includes a base assembly and a transmission member. The base assembly includes a base, a moving reed assembly and a static reed assembly. The normally closed contact and the normally open contact of the moving reed assembly and the static reed assembly are correspondingly arranged. The electromagnetic system includes a yoke, an armature and an elastic member. The elastic member is connected between the yoke and the transmission member. The armature is connected to the transmission member. The transmission member is swingably installed on the base. The transmission member includes a push rod and a pulling hook correspondingly arranged with the moving reed assembly;

[0015] When the electromagnetic system of the electromagnetic relay is energized in the forward direction, it drives the armature to move, thereby pushing the transmission part. The elastic part undergoes elastic deformation. At the same time, the push rod of the transmission part pushes the moving reed assembly to close the normally open contact / open the normally closed contact. When the electromagnetic system of the electromagnetic relay is energized in the reverse direction, it drives the armature to move in the reverse direction. The elastic part recovers its deformation. Under the combined action of the armature and the elastic part, the transmission part is pulled back. Furthermore, the pulling hook of the transmission part pulls the moving reed assembly to open the normally open contact / close the normally closed contact.

[0016] Preferably, the transmission part is an integrally formed structure, and further includes a sheet-like H-shaped body. Two action indicating pieces are formed at the top ends of the two vertical arms of the H-shaped body and extend towards the electromagnetic system. Rotating shafts are provided at the bottom ends of the two vertical arms of the H-shaped body, and the rotating shafts are matched with the rotating shaft bayonets of the base. The H-shaped body is swingably mounted on the base through the rotating shafts. On one side surface of the cross arm of the H-shaped body, there are successively connected a clamping block and a fixing block. An armature clamping groove for clamping the armature is provided on the fixing block. On the other side surface of the cross arm of the H-shaped body, there are successively connected a push rod and a pulling hook. The pulling hook has a hook part for hooking the moving reed of the moving reed assembly.

[0017] Preferably, the electromagnetic system further includes a coil bobbin, a coil, an iron core, a short-circuit ring and a magnet. The coil bobbin includes a bottom mounting block at the bottom, a mounting column in the middle and a top mounting block at the top. The coil bobbin is provided with an axial mounting hole, and the axial mounting hole penetrates through the top mounting block and the mounting column and extends to communicate with the second chamber of the bottom mounting block. The iron core is inserted into the axial mounting hole. The magnet is inserted into the second chamber of the bottom mounting block and is connected to the bottom end of the iron core. The first section at one end of the yoke is inserted into the second chamber of the bottom mounting block and is attached to the magnet. The second section at the other end of the yoke is connected to the elastic part. The short-circuit ring is assembled on the top end of the iron core and rests on the top mounting block. The third section at one end of the armature is swingably mounted on the top mounting block above the short-circuit ring, and the fourth section at the other end of the armature is connected to the transmission part.

[0018] The electromagnetic relay of the present invention has an anti-misoperation function. When the test switch is in the unlocked state, the first locking part of the test switch is engaged with the first locking part of the cover shell, preventing the test switch from pressing down the armature and causing misoperation, effectively avoiding unnecessary functional abnormal conditions caused by misoperation, and improving the reliability of the product. The test switch only needs to pass through a structural part to cooperate with the cover shell to form all functions of unlocking, testing and locking. The three switch states do not interfere with each other, effectively preventing the occurrence of misoperation, and the assembly is simple and the cost is lower. Description of the Drawings

[0019] Figure 1 is the three-dimensional exploded view of the electromagnetic relay of the present invention;

[0020] Figure 2 is the three-dimensional view of the base assembly of the present invention;

[0021] Figure 3 is the front view of the base component of the present invention;

[0022] Figure 4 is the perspective view of the elastic member of the present invention;

[0023] Figure 5 is the front view of the elastic member of the present invention;

[0024] Figure 6 is the schematic structural view of the first embodiment of the insertion piece of the present invention;

[0025] Figure 7 is the schematic structural view of the second embodiment of the insertion piece of the present invention;

[0026] Figure 8 is the perspective view of the electromagnetic system of the present invention;

[0027] Figure 9 is the half-sectional view of the electromagnetic system of the present invention;

[0028] Figure 10 is the perspective view of the coil holder of the present invention;

[0029] Figure 11 is the assembly drawing of the electromagnetic system and the insertion piece of the first embodiment of the present invention;

[0030] Figure 12 is the assembly drawing of the electromagnetic system and the insertion piece of the second embodiment of the present invention;

[0031] Figure 13 is the perspective view of the housing of the present invention;

[0032] Figure 14 is the half-sectional view of the housing of the present invention;

[0033] Figure 15 is the perspective view of the buckle plate of the present invention;

[0034] Figure 16 is the perspective view of the test switch of the present invention;

[0035] Figure 17 is the side view of the test switch of the present invention;

[0036] Figure 18 is the bottom view of the test switch of the present invention;

[0037] Figure 19 is the cross-sectional view of the electromagnetic relay in the unlocking state of the present invention;

[0038] Figure 20 is the perspective view of the electromagnetic relay in the unlocking state of the present invention;

[0039] Figure 21It is a cross-sectional view of the electromagnetic relay in the test state of the present invention;

[0040] Figure 22 It is a perspective view of the electromagnetic relay in the test state of the present invention;

[0041] Figure 23 It is a cross-sectional view of the electromagnetic relay in the locked state of the present invention;

[0042] Figure 24 It is a perspective view of the electromagnetic relay in the locked state of the present invention;

[0043] Figure 25 It is a perspective view of the transmission member of the present invention;

[0044] Figure 26 It is a side view of the transmission member of the present invention;

[0045] Figure 27 It is a half-sectional view of the electromagnetic relay in the forward energized state of the present invention;

[0046] Figure 28 It is a half-sectional view of the electromagnetic relay in the reverse energized state of the present invention. Specific embodiments

[0047] The following combines the Figures 1 to 28 given embodiments to further illustrate the specific embodiments of the electromagnetic relay of the present invention. The electromagnetic relay of the present invention is not limited to the descriptions of the following embodiments.

[0048] As Figure 1 shown, the electromagnetic relay of the present invention includes a base assembly 1, a transmission member 2, an electromagnetic system 3, and a cover assembly 4. As Figure 2 and Figure 3 shown, the base assembly 1 of the present invention includes a base 11, a moving reed assembly 12, a static reed assembly 13, and a lead-out terminal 14 installed on the base 11. One end top surface of the base 11 is provided with an installation cavity 111 for installing the electromagnetic system 3, the lead-out terminal 14 is connected to the bottom surface, and the moving reed assembly 12 and the static reed assembly 13 are installed on the other end of the base 11. The middle part of the base 11 is provided with a rotating shaft bayonet 112 for the swing installation of the transmission member 2. As Figure 1 shown, the electromagnetic system 3, the base assembly 1, and the transmission member 2 are installed in the cover assembly 4. The electromagnetic system 3 is installed in the installation cavity 111 of the base 11, and the transmission member 2 is swingably installed on the base 11 between the static reed assembly 13 and the electromagnetic system 3. The base assembly 1 equipped with the electromagnetic system 3 and the transmission member 2 is installed in the cover assembly 4, and after vacuum pumping and nitrogen filling, glue is applied at the glue groove at the bottom of the base 11 for sealing.

[0049] As Figure 2 and Figure 3As shown in the figure, the moving reed assembly 12 includes a moving reed 121 and two moving contacts 122. One end of the moving reed 121 is fixed on the base 11, and two symmetrical moving contacts 122 are provided on both sides of the other end. A first avoidance opening 1210 for avoiding the transmission member 2 is provided in the middle of the moving reed 121. The static reed assembly 13 includes a first static reed 130, a second static reed 131, a normally closed contact 132, and a normally open contact 133. The first static reed 130 and the second static reed 131 are fixedly installed on the base 11 on both sides of the moving reed 121, and the first static reed 130 is close to the transmission member 2. A second avoidance opening 1300 for avoiding the transmission member 2 is provided in the middle of the first static reed 130, and the second avoidance opening 1300 corresponds to the first avoidance opening 1210. A normally closed contact 132 corresponding to one moving contact 122 is provided on the first static reed 130, and a normally open contact 133 corresponding to the other moving contact 122 is provided on the second static reed 131.

[0050] As Figure 8 and Figure 9 shown in the figure, the electromagnetic system 3 of the present invention includes a bobbin 30, an insert 31, a coil 310, an elastic member 32, an iron core 33, a short-circuit ring 34, a yoke 35, an armature 36, a magnet 37, two connecting posts 38, and an indicator light module 39.

[0051] As Figure 4 and Figure 5As shown in the figure, the elastic member 32 of the present invention is an integrally formed structure made of elastic metal, and includes a reaction spring piece 321, a U-shaped connecting piece 322, two U-shaped fixing pieces 323, a plurality of pressing pieces 324, two upper limiting pieces 325 and two lower limiting pieces 326. A clamping interface 3210 for connecting with the transmission member 2 is provided at the bottom end of the reaction spring piece 321, and the reaction spring piece 321 is clamped with the transmission member 2 to provide a reaction force. The bottom end of the middle section of the U-shaped connecting piece 322 is connected to the top end of the reaction spring piece 321, and a pressing piece 324 for limiting the armature 36 is provided at the top end of the middle section of the U-shaped connecting piece 322. The pressing piece 324 is an L-shaped sheet structure with an opening facing away from the armature 36 and is inclined. The number of the pressing pieces 324 is preferably greater than or equal to two, and the plurality of pressing pieces 324 are uniformly arranged on the top end of the middle section of the U-shaped connecting piece 322, and elastically press the bent part of the armature 36 for limiting after the armature 36 is inserted. The two arm ends of the U-shaped connecting piece 322 are respectively vertically connected to one arm end of the U-shaped fixing piece 323, and the two U-shaped fixing pieces 323 are symmetrically arranged with their openings facing each other. The openings of the two U-shaped fixing pieces 323 are used to clamp the two sides of the yoke 35. Upper limiting pieces 325 are provided at the top ends of the middle sections of the two U-shaped fixing pieces 323, and lower limiting pieces 326 are provided at the bottom ends. The lower limiting piece 326 is an arc-shaped piece, and the two lower limiting pieces 326 are symmetrically arranged with their convex parts facing each other and their concave openings facing away from each other. The lower limiting pieces 326 of the two U-shaped fixing pieces 323 cooperate to clamp the yoke 35. The two upper limiting pieces 325 are symmetrically arranged. The upper limiting piece 325 is an integrally formed structure, and includes a stop portion 3251, a clamping portion 3252 and a pressing portion 3253 which are connected in sequence. The clamping portion 3252 is vertically arranged, and the clamping portions 3252 of the two upper limiting pieces 325 cooperate to clamp the armature 36; the stop portion 3251 is horizontally arranged, and the stop portion 3251 is vertically connected between the top end of the U-shaped fixing piece 323 and the bottom end of the clamping portion 3252 for positioning the yoke 35; the pressing portion 3253 is connected to the top end of the clamping portion 3252, and the pressing portions 3253 of the two upper limiting pieces 325 are symmetrically arranged with their convex parts facing each other and their concave openings facing away from each other for pressing the armature 36 to form a limit on the armature 36. In the electromagnetic relay of the present invention, the reaction spring piece of the elastic member is connected to the transmission member to provide a reaction force for the transmission member, the U-shaped fixing piece is used to clamp and fix the yoke, and the U-shaped connecting piece integrates the reaction spring piece and the U-shaped fixing piece. The structure of the elastic member is simple, which can provide a stable and reliable reaction force for the transmission member, and can be directly inserted and positioned with the yoke, the assembly is simpler, the positioning is accurate without deviation, and the reliability of the product is improved. The arrangement of the two lower limiting pieces of the elastic member further limits and fixes the yoke, and improves the stability and reliability of the positioning and fixing of the yoke by the elastic member. The elastic pressing piece and the upper limiting piece of the elastic member are used to limit the armature, and the positioning of the armature can be completed at one time except for the rotation direction, without riveting and welding, and the positioning is better.

[0052] As Figure 6 and Figure 7As shown in the figure, the insert piece 31 of the present invention includes an insert piece body 311, and a clip piece 312, a connection piece 313, a fixing protrusion 314 and a bending piece 315 provided on the insert piece body 311. The insert piece body 311 is T-shaped. One end of the horizontal arm of the T-shaped insert piece body 311 protrudes from the vertical arm part to be the connection piece 313. A fixing protrusion 314 is provided on the side wall at the other end of the horizontal arm of the insert piece body 311. The fixing protrusion 314 is a wedge-shaped sheet structure; one end of the vertical arm of the insert piece body 311 is connected to one end of the clip piece 312, and the other end of the clip piece 312 warps and protrudes from the insert piece body 311; one end of the bending piece 315 is connected to the bottom end of the vertical arm of the insert piece body 311, and the other end of the bending piece 315 warps, and the warping direction is opposite to the warping direction of the clip piece 312. As Figure 6 As shown in the figure, in the first embodiment of the insert piece 31 of the present invention, a movable hole 316 for the clip piece 312 to move is provided on the vertical arm of the insert piece body 311. The movable hole 316 is a square through hole. One end of the clip piece 312 is connected to the bottom wall of the movable hole 316 of the insert piece body 311, and the other end of the clip piece 312 can swing in the movable hole 316. As Figure 7 As shown in the figure, in the second embodiment of the insert piece 31 of the present invention, the clip piece 312 is connected to the vertical arm of the insert piece body 311 through a J-shaped connecting piece 317. One end of the J-shaped connecting piece 317 is flush-connected to the side of the vertical arm of the insert piece body 311. The other end of the J-shaped connecting piece 317 is parallel and spaced from the vertical arm of the insert piece body 311, and its bottom edge is connected to the clip piece 312; in this embodiment, the bending piece 315 and the clip piece 312 are symmetrically arranged in such a way that the root spacing is smaller than the end spacing.

[0053] As Figure 10 As shown in the figure, the coil bobbin 30 of the present invention includes a bottom mounting block 301, a middle mounting post 302 and a top mounting block 303. The insert piece 31 is inserted into the first chamber 306 of the bottom mounting block 301 and cooperates with the side wall of the first chamber 306 to form a quick-connecting socket. An enameled wire is wound around the mounting post 302 to form a coil 310. The head and tail ends of the coil 310 are connected to the insert piece 31. As Figure 11 and Figure 12As shown, a first chamber 306 for mounting the insertion piece 31 is provided on the bottom mounting block 301 of the bobbin holder 30. One side wall of the first chamber 306 is a fixed side wall 307, and the other side wall is a clamping side wall 308. A limiting inclined surface 309 that cooperates with the bent piece 315 is provided on the fixed side wall 307 of the first chamber 306. The insertion piece 31 is inserted into the first chamber 306. The insertion piece 31 is in contact with the fixed side wall 307 of the first chamber 306. The bent piece 315 of the insertion piece 31 cooperates with the limiting inclined surface 309 to limit the insertion piece 31. Due to the presence of the fixed protrusion 314 of the insertion piece 31, the insertion piece 31 is fixed by interference fit with the first chamber 306. There is a socket between the clamping piece 312 of the insertion piece 31 and the clamping side wall 308 for connecting the lead-out end 14 of the base assembly 1, realizing a quick pluggable connection method. It can be directly and quickly plugged with lead-out ends of different shapes, which is beneficial to realizing standardized and automated production. The processing technology is simple and the cost is relatively low. The bottom mounting block 301 of the bobbin holder 30 has two first chambers 306, and the two first chambers 306 are symmetrically arranged. Correspondingly, the number of the insertion pieces 31 and the lead-out ends 14 is two. One insertion piece 31 is installed in each first chamber 306, and the two insertion pieces 31 are connected to the two lead-out ends 14 in a one-to-one correspondence. One end of the lead-out end 14 is used to connect to an external power supply outside the electromagnetic relay, and the other end of the lead-out end 14 extends into the installation cavity 111 and can be plugged into the socket of the insertion piece 31.

[0054] As Figures 8 - 10As shown, the bobbin 30 is provided with an axially-mounted hole 304 which penetrates through the top mounting block 303 and the mounting post 302 and extends to communicate with the second chamber of the bottom mounting block 301, and the iron core 33 is inserted into the axially-mounted hole 304. The magnet 37 is inserted into the second chamber of the bottom mounting block 301 and connected to the bottom end of the iron core 33; the yoke 35 is L-shaped, including a first section 351 and a second section 352. The first section 351 of the yoke 35 is inserted into the second chamber of the bottom mounting block 301 and abuts against the bottom surface of the magnet 37, and the second section 352 of the yoke 35 is connected to the elastic member 32; the electromagnetic relay is designed as a magnetic latching relay. The two poles of the magnet 37 polarize the iron core 33 and the yoke 35 respectively, and a magnetic latching structure is formed through the polarity change of the excitation of the coil 310. A magnet is installed in the magnetic circuit of the electromagnetic system. There is no need to continuously apply excitation to maintain the attracted state. The two poles of the magnet polarize the iron core and the yoke respectively, and a magnetic latching structure is formed through the polarity change of the coil excitation. The non-excitation state of the electromagnetic system is maintained by reversing the polarities of the magnet and the coil, which is energy-saving and environmentally friendly. The short-circuit ring 34 is assembled on the top end of the iron core 33 and rests on the top mounting block 303. The armature 36 is L-shaped, including a third section 361 and a fourth section 362. The third section 361 of the armature 36 is swingably mounted on the top mounting block 303 above the short-circuit ring 34 and is restricted by the elastic member 32 to abut against the yoke edge on the second section 352 of the yoke 35. The fourth section 362 of the armature 36 passes through the elastic member 32 and is connected to the transmission member 2. The fourth section 362 is located between the U-shaped connecting piece 322 of the elastic member 32 and the second section 352 of the yoke 35. During installation, the second section 352 of the yoke 35 is inserted into the elastic member 32 and then clamped on the yoke 35 by the U-shaped fixing piece 323, and is fixed by the lower limit piece 326 of the U-shaped fixing piece 323 and positioned by the stop portion 3251 of the upper limit piece 325 of the U-shaped fixing piece 323; the armature 36 is pressed below the pressing piece 324 provided on the elastic member 32. The armature 36 is limited on the yoke edge by the pressing piece 324, and the lateral movement of the armature 36 on the yoke 35 is limited by the upper limit piece 325 provided on the elastic member 32. The armature 36 is clamped and fixed by the clamping portions 3252 of the two upper limit pieces 325, and is pressed and positioned by the pressing portions 3253 of the two upper limit pieces 325.

[0055] As Figures 8 - 10As shown in the figure, two mounting bosses 305 are provided at the two corners on the top mounting block 303 of the bobbin 30. The two connecting columns 38 are respectively mounted on the two mounting bosses 305. The connecting column 38 is inserted into the through hole of the mounting boss 305. The indicator light module 39 is placed on the two mounting bosses 305 and is welded and fixed to the two connecting columns 38. A semi-encapsulated space for the armature 36 to swing up and down is formed between the indicator light module 39 and the top mounting block 303. The indicator light module 39 is composed of a circuit board, and components such as light-emitting diodes and resistors welded on the circuit board. It should be noted that the indicator light module 39 can emit light when powered on, which can be achieved by the existing technology. When the product is of AC specification, after the enameled wire is wound, the head and tail of the coil 310 are connected to the connection piece 313 of the insert piece 31. The secondary winding is wound outside the coil 310. The head and tail of the secondary winding of the coil 310 are connected to the connecting column 38, so that the indicator light module 39 takes power from the coil 310 through the two connecting columns 38 and the secondary winding of the coil 310. When the product is of DC specification, after the coil 310 is wound, the head and tail are connected to the insert piece 31, and the connecting column 38 is extended to be connected to the insert piece 31, so that the indicator light module 39 takes power from the coil 310 through the two connecting columns 38 and the two insert pieces 31. The indicator light module is directly installed in the housing, and is directly connected through the coil connecting column provided on the electromagnetic system bobbin. By ensuring the integrity of the housing, the product can be designed as an airtight product, which simplifies the product assembly and improves the production efficiency.

[0056] As Figure 8 and Figure 9 shown in the figure, the working principle of the electromagnetic system 3 of the present invention: The electromagnetic system 3 forms a path through the lead-out end 14 and the insert piece 31. When the electromagnetic system 3 is powered on in the positive direction, the iron core 33 in the middle of the bobbin 30 is magnetized and polarized, and an electromagnetic attraction force is formed on the armature 36 that has been polarized by the magnet 37, driving the third section 361 of the armature 36 to close to and hold against the iron core 33, and the fourth section 362 of the armature 36 then pushes the transmission member 2. When the electromagnetic system 3 is powered on in the reverse direction, after the polarity of the iron core 33 is polarized in the opposite direction, an electromagnetic thrust is formed on the armature 36 that has been polarized by the magnet 37, driving the third section 361 of the armature 36 to separate from and hold against the iron core 33, and the fourth section 362 of the armature 36 then pulls back the transmission member 2. Among them, the iron core assembly composed of the short-circuit ring 34 and the iron core 33 has a magnetic flux splitting effect on the alternating current, ensuring that the electromagnetic attraction force on the end face of the iron core 33 is not zero when the alternating current passes through zero. The connecting column 38 takes power from the head and tail ends of the coil 310, and plays a role in monitoring the energization state of the electromagnetic system 3 by the light emission of the indicator light module 39. As Figure 1 shown in the figure, the housing assembly 4 of the present invention includes a buckle plate 43, a housing 41 and a test switch 42. As Figure 13As shown, the housing 41 is transparent. An installation groove 411 for installing the buckle plate 43 and a counterbore 412 for installing the test switch 42 are provided on the housing 41. The installation groove 411 communicates the counterbore 412 with the outside of the housing 41, and the counterbore 412 communicates the installation groove 411 with the inside of the housing 41. Fixed lugs 431 are provided on the side of the buckle plate 43, and fixing grooves 413 cooperating with the fixed lugs 431 are provided on the side wall of the installation groove 411. As Figure 15 As shown, an operation opening 432, a test opening 433, an indicator light window 434, and an action indication window 435 are provided on the buckle plate 43. The buckle plate 43 is a rectangular plate. Along the long side direction of the buckle plate 43, the operation opening 432, the test opening 433, and the indicator light window 434 are sequentially arranged at the middle position of the buckle plate 43. The number of the action indication windows 435 is two, and the two action indication windows 435 are symmetrically arranged on both sides of the operation opening 432.

[0057] As Figure 13 and Figure 14 As shown, the counterbore 412 of the housing 41 is a convex-shaped groove. Support bosses 414 for supporting the test switch 42 are provided on both side walls in the wide part of the counterbore 412 in a fitting manner. Buckling platforms 415 and gear protrusions 416 are sequentially provided on both side walls of the wide part of the counterbore 412 above the support bosses 414. The buckling platforms 415 are spaced from the support bosses 414. A first locking part 417 and a second locking buckle 418 are sequentially provided between both side walls in the narrow part of the counterbore 412. The second locking buckle 418 is arranged in a fitting manner on the end side wall of the narrow part of the counterbore 412, and the end of the second locking buckle 418 has a pressing slope 419 cooperating with the pressure-receiving slope 4215.

[0058] As Figures 16 - 24 As shown, when the test switch 42 is installed in the counterbore 412 and slides along the counterbore 412, it has an unlocking gear, a test gear, and a locking gear. The test switch 42 is provided with a first locking buckle part 4211 cooperating with the first locking part 417 in the counterbore 412 and a triggering part 4210 cooperating with the armature 36. When the test switch 42 slides to the unlocking gear, the first locking buckle part 4211 of the test switch 42 is locked with the first locking part 417, so that the triggering part 4210 of the test switch 42 cannot contact the armature 36. When the test switch 42 slides to the test gear or the locking gear, the locking between the first locking part 417 and the first locking buckle part 4211 is released. The electromagnetic relay of the present invention has an anti-misoperation function. When the test switch 42 is in the unlocked state, the first locking buckle part 4211 of the test switch 42 is buckled with the first locking part 417 of the housing 41, preventing the test switch 42 from pressing down the armature 36 to cause misoperation, effectively avoiding unnecessary functional abnormal conditions caused by misoperation, and improving the reliability of the product.

[0059] As Figures 16 - 18As shown in the figure, the test switch 42 of the present invention includes a slider 4201 and an elastic piece 4209. The slider 4201 is slidably engaged with the side wall of the sunk groove 412. The slider 4201 is provided with a pushing boss 4208 at the top. Anti-slip stripes are provided on the top surface of the pushing boss 4208 to play an anti-slip role and facilitate manual operation of pushing the pushing boss 4208. The pushing boss 4208 of the test switch 42 is located within the operation port 432 of the buckle plate 43. Sliding protrusions 4202 and gear elastic pieces 4203 are provided on the side wall of the slider 4201. The supporting boss 414 supports the slider 4201. The sliding protrusion 4202 of the slider 4201 is snapped between the supporting boss 414 and the buckling platform 415 and can slide along the buckling platform 415 to achieve the sliding fit between the slider 4201 and the side wall of the sunk groove 412. The two ends of the gear elastic piece 4203 are respectively connected to the side wall of the slider 4201. An unlocking groove 4204, a test groove 4205, and a locking groove 4206 are sequentially provided on the outer side surface of the middle part of the gear elastic piece 4203. The gear protrusion 416 in the sunk groove 412 cooperates with the unlocking groove 4204, the test groove 4205, and the locking groove 4206 to form an unlocking gear position, a test gear position, and a locking gear position. The inner side surface of the middle part of the gear elastic piece 4203 is wavy, having a protruding structure corresponding to the unlocking groove 4204, the test groove 4205, and the locking groove 4206, and having a movable gap 4207 with the side wall of the slider 4201. The unlocking gear position, the test gear position, and the locking gear position formed by the cooperation between the elastic groove of the test switch 42 and the immovable protrusion of the housing 41 have a simple structure, will not cause great resistance to the sliding of the test switch 42, is simple and labor-saving to manually push the test switch 42, and at the same time, the formed gear positions are stable.

[0060] As Figures 16 - 18 shown, one end of the elastic piece 4209 is connected to the bottom surface of the slider 4201. The other end of the elastic piece 4209 is a movable end. A touch portion 4210, a second locking portion 4212, and a test platform 4213 are provided on the movable end. One end of the second locking portion 4212 is connected to one end of the touch portion 4210, and there is an adjustment gap 4214 between the other ends, forming a horizontally placed U-shaped structure; the test platform 4213 is an inverted L-shaped structure. The bottom end of the test platform 4213 is connected to the end of the U-shaped structure. The top end of the test platform 4213 extends to the left to form a first locking portion 4211 flush with the right part of the top end. The test platform 4213 and the first locking portion 4211 form a T-shaped structure. A test groove 4205 is provided on the test platform 4213. When the test switch 42 slides to the test gear position, the test groove 4205 is aligned with the test port 433.

[0061] As Figures 16 - 18As shown, the second locking portion 4212 of the elastic piece 4209 has a pressure-receiving inclined surface 4215, and the pressure-receiving inclined surface 4215 cooperates with the pressing inclined surface 419 in the sinking groove 412. When the test switch 42 slides to the locking gear position, the pressing inclined surface 419 presses the pressure-receiving inclined surface 4215 of the elastic piece 4209, causing the movable end of the elastic piece 4209 to move downward, and the contact portion 4210 on the movable end moves downward accordingly to contact the armature 36. At this time, the second locking portion 4212 and the second locking buckle 418 are locked. There is an adjustment gap 4214 between the second locking portion 4212 and the contact portion 4210. The existence of the adjustment gap 4214 can reduce the influence of the interference fit between the test switch 42 and the armature 36 through the elastic deformation of the elastic piece 4209.

[0062] As Figures 19 - 20 shown, when the test switch 42 is in the unlocking state, that is, when the gear protrusion 416 is snapped into the unlocking groove 4204, the first locking portion 4211 of the test switch 42 is engaged with the first locking portion 417 of the housing 41, thereby locking the test switch 42. At this time, the contact portion 4210 of the test switch 42 cannot press down the armature 36 to cause interference to the armature 36, and the product can freely operate through the energization and excitation of the electromagnetic system 3, preventing the test switch 42 from malfunctioning and causing the product to malfunction. As Figures 21 - 22 shown, when the test switch 42 slides to the test state, that is, when the gear protrusion 416 is snapped into the test groove 4205, the first locking portion 4211 of the test switch 42 is separated from the first locking portion 417 of the housing 41. At this time, the contact portion 4210 is in critical contact with the armature 36. In addition, at this time, a point-moving test can be performed through the test port 433 provided on the buckle plate 43, that is, the test groove 4205 is pressed against the test platform 4213 with a tool, and the contact portion 4210 moves downward accordingly to contact the armature 36, driving the transmission member 2 to drive the moving reed assembly 12 to act, thereby switching the contact state. After the pressing force on the test platform 4213 is removed after the test is completed, the contact portion 4210 resumes the critical contact state with the armature 36. As Figures 23 - 24As shown in the figure, when the test switch 42 is further slid to the locked state, the pressed inclined surface 4215 of the elastic piece 4209 of the test switch 42 slides along the pressing inclined surface 419 of the cover 41 to form a downward pressing on the elastic piece 4209. The triggering part 4210 of the elastic piece 4209 presses the armature 36, driving the armature 36 to move, and further driving the transmission part 2 to drive the moving contact spring piece assembly 12 to move. Finally, the second locking part 4212 is locked below the second lock catch 418 of the cover 41. At this time, the triggering part 4210 cannot move upward to reset, maintaining the pressing on the armature 36, thus locking the contact state. At this time, the gear protrusion 416 remains stuck in the locking groove 4206. Through the above structural design, the test switch only needs one structural part to cooperate with the cover to form all functions of unlocking, testing, and locking. The three switch states do not interfere with each other, effectively preventing misoperation, and the assembly is simple and the cost is lower.

[0063] As Figures 25 - 28 shown, the elastic member 32 is connected between the yoke 35 and the transmission member 2. The armature 36 is connected to the transmission member 2 and can drive the transmission member 2 to further drive the moving contact spring piece assembly 12 of the base assembly 1. The transmission member 2 is installed on the base 11, and the transmission member 2 can swing or move relative to the base 11. The transmission member 2 includes a push rod 202 and a pull-back hook 203 corresponding to the moving contact spring piece assembly 12. As Figure 27 shown, when the electromagnetic system 3 of the electromagnetic relay is energized in the forward direction, the armature 36 is driven by the electromagnetic system 3 to move, and then the transmission member 2 is pushed. The elastic member 32 undergoes elastic deformation. At the same time, the push rod 202 of the transmission member 2 pushes the moving contact spring piece assembly 12 to close the normally open contact 133 of the static contact spring piece assembly 13 / open the normally closed contact 132. When the electromagnetic relay is de-energized and non-excited, the moving contact spring piece assembly 12 is maintained to close the normally open contact 133 of the static contact spring piece assembly 13 / open the normally closed contact 132. As Figure 28 shown, when the electromagnetic system 3 of the electromagnetic relay is energized in the reverse direction, the armature 36 is driven to move in the reverse direction. Under the combined action of the pulling force of the armature 36 and the deformation force of the elastic member 32, the transmission member 2 is pulled back. Then, the pull-back hook 203 of the transmission member 2 pulls the moving contact spring piece assembly 12 to open the normally open contact 133 of the static contact spring piece assembly 13 / close the normally closed contact 132. When the electromagnetic relay is de-energized and non-excited, the moving contact spring piece assembly 12 is maintained to open the normally open contact 133 of the static contact spring piece assembly 13 / close the normally closed contact 132. The transmission structure of the electromagnetic relay of the present invention realizes bidirectional transmission through the mutual cooperation between the transmission member 2, the elastic member 32, and the yoke 35, and the cooperation between the push rod 202 and the pull-back hook 203 of the transmission member 2 and the moving contact spring piece assembly 12. The transmission member 2 can not only push the moving contact spring piece assembly 12 to close the normally open contact 133, but also pull the moving contact spring piece assembly 12 to close the normally closed contact 132, effectively solving the problem that the traditional one can only generate pressure through the elasticity of the moving contact spring piece 121 itself, resulting in relatively small normally closed pressure and insufficient working reliability, and improving the reliability of the product.

[0064] As Figure 25 shown, one end of the transmission member 2 is integrally provided with an action indicating piece 205, the action indicating piece 205 is correspondingly arranged with an action indicating window 435 on the buckle plate 43, the other end of the transmission member 2 is integrally provided with a rotating shaft 206, the rotating shaft 206 is matched with a rotating shaft bayonet 112 of the base 11, and the rotating shaft 206 of the transmission member 2 is inserted into the rotating shaft bayonet 112 to enable the transmission member 2 to be swingably mounted on the base 11 with the rotating shaft 206 as a fulcrum. As Figure 27 shown, when the electromagnetic relay is in the forward power-on state, the action indicating piece 205 is aligned with the action indicating window 435, and the action indicating piece 205 can be seen through the action indicating window 435 from outside the housing 41. As Figure 28 shown, when the electromagnetic relay is in the reverse power-on state, the action indicating piece 205 is misaligned with the action indicating window 435, and the action indicating piece 205 cannot be seen through the action indicating window 435 from outside the housing 41. The transmission member 2 and the action indicating piece 205 are integrated, eliminating the hinge connection between the action indicating member and the transmission member, reducing parts, and lowering the assembly complexity. The action indication is changed from the traditional linear motion to swinging, increasing the working stroke and being beneficial to the effective identification by the customer.

[0065] As Figures 25 - 26As shown, in a specific embodiment, the transmission member 2 of the present invention is an integrally formed structure, including a sheet-like H-shaped body 201, a push rod 202, a pull-back hook 203, a fixing block 204, an action indicating piece 205, and a rotating shaft 206. The push rod 202 is a square long bar, and the width of the first avoidance opening 1210 of the moving reed 121 < the width of the push rod 202 < the width of the second avoidance opening 1300 of the first static reed 130. Two vertical arms of the H-shaped body 201 extend towards the electromagnetic system 3 at the top to form two action indicating pieces 205. Rotating shafts 206 are provided at the bottom ends of the two vertical arms of the H-shaped body 201, and the rotating shafts 206 are matched with the rotating shaft bayonet 112 of the base 11. The H-shaped body 201 is swingably mounted on the base 11 between the static reed assembly 13 and the electromagnetic system 3 through the rotating shafts 206. Longitudinal reinforcing ribs 209 are provided on both vertical arms of the H-shaped body 201 to improve the firmness of the transmission structure. On one side of the cross arm of the H-shaped body 201, that is, on the side facing the electromagnetic system 3, there are successively connected a clamping block 207 and a fixing block 204. On the other side of the cross arm of the H-shaped body 201, there are successively connected a push rod 202 and a pull-back hook 203. The clamping block 207 is matched with the clamping opening 3210 of the elastic member 32 for clamping the elastic member 32. An armature clamping groove 208 for clamping the armature 36 is provided on the fixing block 204. The pull-back hook 203 is a horizontally placed T-shaped structure. The narrow end of the pull-back hook 203 is connected to the end of the push rod 202. The wide end of the T-shaped pull-back hook 203 has two protruding hook parts 2030, and the height of the first avoidance opening 1210 of the moving reed 121 < the height of the wide end of the pull-back hook 203 < the height of the second avoidance opening 1300 of the first static reed 130. An avoidance inclined surface 2031 for avoiding the moving reed 121 is provided at the end of the hook part 2030 of the pull-back hook 203, and the avoidance inclined surface 2031 is consistent with the swing amplitude of the transmission member 2. When the pull-back hook 203 of the transmission member 2 is pulled back during reverse energization of the electromagnetic relay, due to the fulcrum action of the rotating shaft 206 provided on the transmission member 2, the hook part 2030 of the transmission member 2 also tilts accordingly, and the avoidance inclined surface 2031 provided on the hook part 2030 is consistent with the angle after the transmission member 2 swings, so as to ensure that the cooperation between the hook part 2030 and the moving reed 121 is relatively parallel, which is convenient for improving the smoothness and reliability of the hook part 2030 pulling the moving reed 121. The sheet-like structure of the transmission member 2 is simple and lightweight, improving the sensitivity of transmission, reducing the occupied space, and facilitating the reasonable and compact layout of the overall structure of the product.

[0066] As Figures 27 - 28As shown, the elastic member 32 is snap-fitted onto the snap block 207 of the transmission member 2 through the snap interface 3210 thereon, and the end of the armature 36 is snap-fitted into the armature slot 208 of the transmission member 2. The transmission member and the armature adopt the slot snap-fitting method instead of the traditional lapping method to avoid phenomena such as transmission jamming and detachment. When the electromagnetic relay is energized in the reverse direction, under the combined action of the deformation force of the elastic member 32 and the electromagnetic force on the armature 36, the transmission member 2 pulls back the moving reed 121, further solving the problem that the normally closed pressure is relatively small and the working reliability is insufficient due to the fact that the traditional moving reed 121 can only generate pressure through its own elasticity, and improving the reliability of the product. The rotating shaft 206 of the transmission member 2 is inserted into the rotating shaft bayonet 112 of the base 11, and the push rod 202 of the transmission member 2 passes through the second avoidance opening 1300 of the first static reed 130 and can be blocked by the moving reed 121 and does not pass through the first avoidance opening 1210 of the moving reed 121. The pulling hook 203 passes through the second avoidance opening 1300 of the first static reed 130 and the first avoidance opening 1210 of the moving reed 121 in sequence. The hook portion 2030 of the pulling hook 203 can hook the moving reed 121, so that the pulling hook 203 cannot reverse and pass through the first avoidance opening 1210. When the pulling hook 203 moves in the reverse direction of the passing direction, its hook portion 2030 hooks the moving reed 121, so that the pulling hook 203 can drive the moving reed 121 synchronously.

[0067] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An electromagnetic relay, comprising an electromagnetic system (3) and a housing assembly (4), the electromagnetic system (3) includes an armature (36), the housing assembly (4) includes a housing (41) and a test switch (42), a counterbore (412) is provided on the housing (41), the test switch (42) is installed in the counterbore (412) and has an unlocking position, a test position and a locking position when sliding along the counterbore (412), and a first locking portion (417) is provided in the counterbore (412). Characterized in that: The test switch (42) is provided with a first locking portion (4211) cooperating with the first locking portion (417) and a triggering portion (4210) cooperating with the armature (36). When the test switch (42) slides to the unlocking position, the first locking portion (4211) of the test switch (42) is locked with the first locking portion (417) so that the triggering portion (4210) of the test switch (42) cannot contact the armature (36); when the test switch (42) slides to the test position or the locking position, the locking between the first locking portion (417) and the first locking portion (4211) is released. The test switch (42) includes a slider (4201) and an elastic sheet (4209), the slider (4201) is provided with a pushing boss (4208) at the top, one end of the elastic sheet (4209) is connected to the slider (4201), the other end of the elastic sheet (4209) is a movable end, the triggering portion (4210) and a second locking portion (4212) are provided on the movable end, and the second locking portion (4212) has a pressure-receiving inclined surface (4215), and a second locking catch (418) cooperating with the second locking portion (4212) is provided in the counterbore (412), and the second locking catch (418) has a pressing inclined surface (419) cooperating with the pressure-receiving inclined surface (4215). When the test switch (42) slides to the locking position, the pressing inclined surface (419) presses the pressure-receiving inclined surface (4215) of the elastic sheet (4209), so that the movable end of the elastic sheet (4209) moves downward, and the triggering portion (4210) on the movable end presses the armature (36) downward accordingly, and finally the second locking portion (4212) is locked with the second locking catch (418).

2. The electromagnetic relay according to claim 1, Characterized in that: An adjustment gap (4214) is provided between the second locking portion (4212) and the triggering portion (4210).

3. The electromagnetic relay according to claim 1, Characterized in that: A test platform (4213) is further provided on the movable end of the elastic sheet (4209). Test platform grooves are provided on the test platform (4213). The cover assembly (4) further includes a buckle plate (43). An installation groove (411) for installing the buckle plate (43) is provided on the cover (41). The installation groove (411) communicates with the sunken groove (412) and the outside of the cover (41). The sunken groove (412) communicates with the installation groove (411) and the inside of the cover (41). A test port (433) is provided on the buckle plate (43); when the test switch (42) slides to the test gear position, the test platform groove is aligned with the test port (433).

4. The electromagnetic relay according to claim 3, characterized in that: The unlocking gear position, the test gear position and the locking gear position are arranged in sequence; one end of the second locking portion (4212) and the actuating portion (4210) are connected, and there is an adjustment gap (4214) between the other ends, forming a horizontally arranged U-shaped structure; the test platform (4213) is an inverted L-shaped structure, the bottom end of the test platform (4213) is connected to the end of the U-shaped structure, and the top end of the test platform (4213) extends to the left to form the first locking portion (4211) flush with the right part of the top end, and the test platform (4213) and the first locking portion (4211) form a T-shaped structure.

5. The electromagnetic relay according to claim 1, characterized in that: Sliding protrusions (4202) and gear elastic sheets (4203) are provided on the side wall of the slider (4201). A support boss (414) for supporting the test switch (42) is provided on the side wall of the sunken groove (412). A buckle platform (415) and a gear protrusion (416) are further provided on the side wall of the sunken groove (412) above the support boss (414). The sliding protrusion (4202) is clamped between the support boss (414) and the buckle platform (415) and can slide along the buckle platform (415). Unlocking grooves (4204), test grooves (4205) and locking grooves (4206) are sequentially provided on the gear elastic sheet (4203). The cooperation between the gear protrusion (416) and the unlocking grooves (4204), the test grooves (4205) and the locking grooves (4206) forms the unlocking gear position, the test gear position and the locking gear position.

6. The electromagnetic relay according to claim 5, characterized in that: Both ends of the gear elastic sheet (4203) are respectively connected to the side wall of the slider (4201). Unlocking grooves (4204), test grooves (4205) and locking grooves (4206) are provided on the outer side surface of the middle part of the gear elastic sheet (4203). There is an activity gap (4207) between the inner side surface of the middle part of the gear elastic sheet (4203) and the side wall of the slider (4201).

7. The electromagnetic relay according to any one of claims 1-6, characterized in that: It further includes a base assembly (1) and a transmission member (2). The base assembly (1) includes a base (11), a moving reed assembly (12), and a static reed assembly (13). The moving reed assembly (12) is correspondingly arranged with the normally closed contact (132) and the normally open contact (133) of the static reed assembly (13). The electromagnetic system (3) includes a yoke (35), an armature (36), and an elastic member (32). The elastic member (32) is connected between the yoke (35) and the transmission member (2). The armature (36) is connected to the transmission member (2). The transmission member (2) is swingably mounted on the base (11). The transmission member (2) includes a push rod (202) and a pull-back hook (203) correspondingly arranged with the moving reed assembly (12). When the electromagnetic system (3) of the electromagnetic relay is energized forward, it drives the armature (36) to act, thereby pushing the transmission member (2). The elastic member (32) undergoes elastic deformation. At the same time, the push rod (202) of the transmission member (2) pushes the moving reed assembly (12) to close the normally open contact (133) / open the normally closed contact (132). When the electromagnetic system (3) of the electromagnetic relay is energized reversely, it drives the armature (36) to act reversely. The elastic member (32) restores its deformation. Under the combined action of the armature (36) and the elastic member (32), the transmission member (2) is pulled back. Then, the pull-back hook (203) of the transmission member (2) pulls the moving reed assembly (12) to open the normally open contact (133) / close the normally closed contact (132).

8. The electromagnetic relay according to claim 7, characterized in that: The transmission member (2) is an integrally formed structure and further includes a sheet-like H-shaped body (201). Two top ends of the two vertical arms of the H-shaped body (201) extend towards the electromagnetic system (3) to form two action indicating pieces (205). Shafts (206) are provided at the bottom ends of the two vertical arms of the H-shaped body (201). The shafts (206) are matched with the shaft bayonet (112) of the base (11). The H-shaped body (201) is swingably mounted on the base (11) through the shafts (206). On one side surface of the cross arm of the H-shaped body (201), there are successively connected a clamping block (207) and a fixing block (204). An armature clamping groove (208) for clamping the armature (36) is provided on the fixing block (204). On the other side surface of the cross arm of the H-shaped body (201), there are successively connected a push rod (202) and a pull-back hook (203). The pull-back hook (203) has a hook part (2030) for hooking the moving reed (121) of the moving reed assembly (12).

9. The electromagnetic relay according to claim 7, characterized in that: The electromagnetic system (3) further includes a bobbin (30), a coil (310), an iron core (33), a short-circuit ring (34), and a magnet (37). The bobbin (30) includes a bottom mounting block (301), a middle mounting post (302), and a top mounting block (303). The bobbin (30) is provided with an axial mounting hole (304) that penetrates through the top mounting block (303) and the mounting post (302) and extends to communicate with a second chamber of the bottom mounting block (301). The iron core (33) is inserted into the axial mounting hole (304). The magnet (37) is inserted into the second chamber of the bottom mounting block (301) and is connected to the bottom end of the iron core (33). A first section (351) of one end of the yoke (35) is inserted into the second chamber of the bottom mounting block (301) and is in contact with the magnet (37). A second section (352) of the other end of the yoke (35) is connected to the elastic member (32). The short-circuit ring (34) is assembled on the top end of the iron core (33) and rests on the top mounting block (303). A third section (361) of one end of the armature (36) is swingably mounted on the top mounting block (303) above the short-circuit ring (34). A fourth section (362) of the other end of the armature (36) is connected to the transmission member (2).

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