阅读说明：本技术 一种端子防靠拢式电磁继电器 (Terminal anti-closing electromagnetic relay ) 是由 杜欣洋 于 2021-02-07 设计创作，主要内容包括：本发明涉及继电器技术领域,尤其公开了一种端子防靠拢式电磁继电器,包括绝缘体,设置于绝缘体的电磁铁、动端子、第一端子及第二端子,设置于动端子的衔铁；绝缘体具有第一板体、设置于第一板体的第一突块及第二突块,第一端子具有压持在第一板体上并位于两个突块之间的第一接触部,第二端子具有设置在两个突块上并位于两个突块之间的第二接触部,第一接触部、第二接触部之间形成有让位间隙,动端子具有位于让位间隙内并位于两个突块之间的第三接触部,第三接触部用于接触导通第一接触部或用于接触导通第二接触部；借助突块对第一接触部、第二接触部进行隔离限制,确保两者准确地定位在所需的位置,避免两者彼此靠近而使用不良。(The invention relates to the technical field of relays, and particularly discloses a terminal anti-close type electromagnetic relay which comprises an insulator, an electromagnet, a movable terminal, a first terminal, a second terminal and an armature, wherein the electromagnet, the movable terminal, the first terminal and the second terminal are arranged on the insulator; the insulator is provided with a first plate body, a first protruding block and a second protruding block, the first protruding block and the second protruding block are arranged on the first plate body, the first terminal is provided with a first contact portion which is pressed on the first plate body and located between the two protruding blocks, the second terminal is provided with a second contact portion which is arranged on the two protruding blocks and located between the two protruding blocks, a yielding gap is formed between the first contact portion and the second contact portion, the movable terminal is provided with a third contact portion which is located in the yielding gap and located between the two protruding blocks, and the third contact portion is used for conducting the first contact portion in a contact mode or conducting the second contact portion in a contact mode; the first contact part and the second contact part are isolated and limited by the bumps, so that the first contact part and the second contact part are accurately positioned at required positions, and the phenomenon that the first contact part and the second contact part are close to each other and are poor in use is avoided.)

1. A terminal anti-close type electromagnetic relay comprises an insulator, an electromagnet, a movable terminal, a first terminal, a second terminal and an armature, wherein the electromagnet, the movable terminal, the first terminal and the second terminal are arranged on the insulator; the method is characterized in that: the insulator is provided with a first plate body, a first protruding block and a second protruding block, the first protruding block and the second protruding block are arranged on the first plate body, the first terminal is provided with a first contact portion which is pressed on the first plate body and located between the two protruding blocks, the second terminal is provided with a second contact portion which is arranged on the two protruding blocks and located between the two protruding blocks, a yielding gap is formed between the first contact portion and the second contact portion, the moving terminal is provided with a third contact portion which is located in the yielding gap and located between the two protruding blocks, and the third contact portion is used for contacting and conducting the first contact portion or contacting and conducting the second contact portion.

2. The terminal close-up prevention type electromagnetic relay according to claim 1, characterized in that: the insulating body is provided with a second plate body spaced from the first plate body and a core column for connecting the first plate body and the second plate body, and the first supporting plate is inserted between the two plate bodies and used for supporting the two plate bodies to prevent the two plate bodies from approaching each other; the first terminal is provided with a first welding leg bent from the first contact part, one end of the first welding leg is arranged on the first bump, and the other end of the first welding leg penetrates through the second plate body; the second terminal is provided with a second welding leg bent from the second contact part, one end of the second welding leg is arranged on the second protruding block, the other end of the second welding leg penetrates through the second plate body, and the first welding leg and the second welding leg are located between the first supporting plates.

3. The terminal close-up prevention electromagnetic relay according to claim 2, characterized in that: still include the second fagging, first fagging, second fagging are located the both sides of stem respectively, and the second fagging has the main part, sets up respectively in picture peg and the buckle at the same one side both ends of main part, and the second plate body has the jack that is used for holding the picture peg, and one side that the second plate body was kept away from to the first plate body is equipped with the catching groove, and the one end that the main part was kept away from to the buckle is equipped with the discount that is used for buckleing.

4. The terminal close-up prevention electromagnetic relay according to claim 3, characterized in that: the electromagnet comprises an iron core, a coil and a yoke, wherein the iron core penetrates through the core column, the coil is wound on the outer side of the core column and is positioned between the two plate bodies, the coil is positioned between the two supporting plates, the yoke is approximately L-shaped, the yoke comprises a first iron plate and a second iron plate formed by bending the first iron plate, the first iron plate penetrates through the inserting plate and is inserted into the second plate body, and one end of the iron core is arranged on the first iron plate; one side of the second supporting plate, which is far away from the core column, is provided with a containing blind groove for containing a second iron plate, one end of the armature is abutted and pressed on the second iron plate, and the other end of the iron core protrudes out of the first plate body and is used for sucking the other end of the armature.

5. The terminal close-up prevention electromagnetic relay according to claim 4, characterized in that: the movable terminal comprises a first reed and a second reed formed by bending the first reed, the first reed is arranged on the second iron plate, and the armature is arranged on the second reed; the bent parts of the first spring and the second spring are provided with abdicating through holes exposing the armature, the first spring is provided with a lug part positioned in the abdicating through holes, and the lug part is used for blocking and abutting against one end of the armature far away from the third contact part.

6. The terminal close-up prevention electromagnetic relay according to claim 5, characterized in that: the movable terminal further comprises two lug pieces which are arranged on the same side of the first reed and far away from two ends of the first reed, each lug piece is provided with a reverse buckle formed by tearing and bending, each reverse buckle is located between the two lug pieces, the two lug pieces are respectively located on two sides of the second iron plate and inserted into the accommodating blind groove, and the free end of each reverse buckle is used for abutting against one side, far away from the first reed, of the second iron plate.

7. The terminal close-up prevention electromagnetic relay according to claim 5, characterized in that: the first reed is provided with a third welding leg penetrating through the second plate body, the first welding leg and the second welding leg are respectively positioned at two sides of the same end of the second plate body, which are far away from each other, the third welding leg and the first welding leg are respectively positioned at two ends of the second plate body, which are far away from each other, and the third welding leg is positioned in the middle of the second plate body; the one end that first leg was kept away from to the second plate body has two power supply terminals, and the power supply terminal is used for switching on the coil, and the fourth leg of two power supply terminals is located the both sides that the same end of second plate body kept away from each other.

8. The terminal close-up prevention type electromagnetic relay according to claim 1, characterized in that: the two protruding blocks are provided with limiting blind grooves, the limiting blind grooves are formed by concavely arranging one sides, close to each other, of the two protruding blocks, the moving terminal further comprises two fins arranged on two sides of the third contact portion respectively, and the two fins are accommodated in the limiting blind grooves of the two protruding blocks respectively.

9. The terminal close-up prevention type electromagnetic relay according to claim 1, characterized in that: the second plate body is used for covering an opening of the accommodating cavity, and the second contact part is clamped between the lug and the bottom surface of the accommodating cavity; the first plate body is provided with a positioning hole, and the plastic shell is provided with a positioning column which is positioned in the containing cavity and inserted into the positioning hole.

10. The terminal close-up prevention electromagnetic relay according to claim 9, characterized in that: the plastic shell is provided with an air hole communicated with the accommodating cavity, the air hole is formed in the side wall of the plastic shell, and the air hole penetrates through the side wall of the plastic shell; along the central axis direction of the air holes, the air holes are wavy.

Technical Field

The invention relates to the technical field of relays and particularly discloses an electromagnetic relay with terminals prevented from being closed.

Background

The relay is the automatic switch that various circuits were used commonly, and the kind of relay is diversified, and electromagnetic relay is just one of the kind of relay commonly used, and electromagnetic relay mainly disposes magnet unit and terminal unit, and magnet unit drive terminal unit removes and switches on or break off, and the structural design of terminal unit is unreasonable among the prior art, and the terminal unit can be because of receiving the collision and can take place the position removal, leads to electromagnetic relay to use badly.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a terminal anti-close type electromagnetic relay, which can ensure that a first contact part and a second contact part are accurately positioned at a required position by isolating and limiting the first contact part and the second contact part through a lug, and avoid poor use caused by the fact that the first contact part and the second contact part are close to each other.

In order to achieve the purpose, the terminal anti-close type electromagnetic relay comprises an insulator, an electromagnet, a movable terminal, a first terminal, a second terminal and an armature, wherein the electromagnet, the movable terminal, the first terminal and the second terminal are arranged on the insulator; the insulator is provided with a first plate body, a first protruding block and a second protruding block, the first protruding block and the second protruding block are arranged on the first plate body, the first terminal is provided with a first contact portion which is pressed on the first plate body and located between the two protruding blocks, the second terminal is provided with a second contact portion which is arranged on the two protruding blocks and located between the two protruding blocks, a yielding gap is formed between the first contact portion and the second contact portion, the moving terminal is provided with a third contact portion which is located in the yielding gap and located between the two protruding blocks, and the third contact portion is used for contacting and conducting the first contact portion or contacting and conducting the second contact portion.

The insulating body is provided with a second plate body spaced from the first plate body and a core column for connecting the first plate body and the second plate body, and the first supporting plate is inserted between the two plate bodies and used for supporting the two plate bodies to prevent the two plate bodies from approaching each other; the first terminal is provided with a first welding leg bent from the first contact part, one end of the first welding leg is arranged on the first bump, and the other end of the first welding leg penetrates through the second plate body; the second terminal is provided with a second welding leg bent from the second contact part, one end of the second welding leg is arranged on the second protruding block, the other end of the second welding leg penetrates through the second plate body, and the first welding leg and the second welding leg are located between the first supporting plates.

Wherein, still include the second fagging, first fagging, second fagging are located the both sides of stem respectively, and the second fagging has the main part, sets up respectively in picture peg and the buckle of main part with one side both ends, and the second plate body has the jack that is used for holding the picture peg, and one side that the second plate body was kept away from to the first plate body is equipped with the catching groove, and the one end that the main part was kept away from to the buckle is equipped with the discount that is used for buckleing into in.

The electromagnet comprises an iron core, a coil and a yoke, wherein the iron core penetrates through the core column, the coil is wound on the outer side of the core column and is positioned between the two plate bodies, the coil is positioned between the two supporting plates, the yoke is approximately L-shaped, the yoke comprises a first iron plate and a second iron plate formed by bending the first iron plate, the first iron plate penetrates through the inserting plate and is inserted into the second plate body, and one end of the iron core is arranged on the first iron plate; one side of the second supporting plate, which is far away from the core column, is provided with a containing blind groove for containing a second iron plate, one end of the armature is abutted and pressed on the second iron plate, and the other end of the iron core protrudes out of the first plate body and is used for sucking the other end of the armature.

The movable terminal comprises a first reed and a second reed formed by bending the first reed, the first reed is arranged on the second iron plate, and the armature is arranged on the second reed; the bent parts of the first spring and the second spring are provided with abdicating through holes exposing the armature, the first spring is provided with a lug part positioned in the abdicating through holes, and the lug part is used for blocking and abutting against one end of the armature far away from the third contact part.

The movable terminal further comprises two lug pieces which are arranged at the same side of the first reed and far away from two ends of the first reed, each lug piece is provided with a reverse buckle formed by tearing and bending, the reverse buckle is positioned between the two lug pieces, the two lug pieces are respectively positioned at two sides of the second iron plate and inserted into the accommodating blind grooves, and the free end of the reverse buckle is used for abutting against one side of the second iron plate far away from the first reed.

The first reed is provided with a third welding leg penetrating through the second plate body, the first welding leg and the second welding leg are respectively positioned at two sides of the same end of the second plate body, which are far away from each other, the third welding leg and the first welding leg are respectively positioned at two ends of the second plate body, which are far away from each other, and the third welding leg is positioned in the middle of the second plate body; the one end that first leg was kept away from to the second plate body has two power supply terminals, and the power supply terminal is used for switching on the coil, and the fourth leg of two power supply terminals is located the both sides that the same end of second plate body kept away from each other.

The movable terminal comprises a third contact part and a movable terminal, wherein the movable terminal is provided with a third contact part and a third contact part, the third contact part is arranged on the movable terminal, the movable terminal is provided with a third contact part, the third contact part is arranged on the movable terminal, the first contact part is arranged on the first contact part, the second contact part is arranged on the second contact part, the third contact part is arranged on the second contact part, and the third contact part is arranged on.

The second plate body is used for covering an opening of the accommodating cavity, and the second contact part is clamped between the lug and the bottom surface of the accommodating cavity; the first plate body is provided with a positioning hole, and the plastic shell is provided with a positioning column which is positioned in the containing cavity and inserted into the positioning hole.

The plastic shell is provided with air holes communicated with the accommodating cavity, the air holes are formed in the side wall of the plastic shell, and the air holes penetrate through the side wall of the plastic shell; along the central axis direction of the air holes, the air holes are wavy.

The invention has the beneficial effects that: in the use process of the electromagnetic relay, the first plate body stops and abuts against the first contact part, the first contact part and the second contact part are isolated and limited by the bumps, the first contact part and the second contact part are accurately positioned at required positions, poor use caused by the fact that the first contact part and the second contact part are close to each other is avoided, and the stability of the use performance of the electromagnetic relay is improved.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is an exploded view of the present invention;

FIG. 3 is an exploded view of another aspect of the present invention;

fig. 4 is a sectional partial enlarged view of the plastic case of the present invention.

The reference numerals include:

1-insulator 2-movable terminal 3-first terminal

4-second terminal 5-armature 6-first plate

7-first bump 8-second bump 9-first contact

11-second contact part 12-first supporting plate 13-second plate body

14-core column 15-first solder foot 16-second solder foot

17-second supporting plate 18-inserting plate 19-pinch plate

21-iron core 22-coil 23-yoke

24-first iron plate 25-second iron plate 26-accommodating blind groove

27-first spring 28-second spring 29-lug part

31-lug 32-reverse 33-third welding leg

34-power terminal 35-plastic shell 36-air hole

37-waterproof breathable membrane.

Detailed Description

For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

Referring to fig. 1 to 4, the terminal-close-proof electromagnetic relay of the present invention includes an insulator 1, an electromagnet, a moving terminal 2, a first terminal 3, and a second terminal 4, which are mounted on the insulator 1, and an armature 5 mounted on the moving terminal 2, wherein the electromagnet generates a magnetic force after being energized, the magnetic force of the electromagnet is used to attract the armature 5 to move, the moving armature 5 drives the moving terminal 2 to move, and the moving terminal 2 can conduct the first terminal 3 or the second terminal 4.

The insulator 1 has a first plate 6, a first protrusion 7 and a second protrusion 8 disposed on the first plate 6, the first protrusion 7 and the second protrusion 8 are disposed on one side of the first plate 6 away from the second plate 13, and the first protrusion 7 and the second protrusion 8 are disposed on two ends of the first plate 6 away from each other on the same side.

The first terminal 3 has a first contact portion 9 pressed against the first plate 6 and positioned between the two protrusions, the first contact portion 9 is substantially flat, the second terminal 4 has a second contact portion 11 provided on the two protrusions and positioned between the two protrusions, the second contact portion 11 is substantially flat, a relief gap is formed between the first contact portion 9 and the second contact portion 11, and the first contact portion 9 and the second contact portion 11 are substantially parallel. The movable terminal 2 has a third contact portion located in the yielding gap and located between the two bumps, and the third contact portion is used for contacting and conducting the first contact portion 9 or the second contact portion 11.

In the use process of the electromagnetic relay, the first plate body 6 is blocked and abutted against the first contact part 9, the first contact part 9 and the second contact part 11 are isolated and limited by the bumps, the two parts are accurately positioned at required positions, poor use caused by the fact that the two parts are close to each other is avoided, and the stability of the use performance of the electromagnetic relay is improved.

Still include first fagging 12, first fagging 12 adopts insulating plastics to make, and insulator 1 has the second plate body 13 with first plate body 6 interval, connects the stem 14 of first plate body 6 and second plate body 13, and first plate body 6 and second plate body 13 parallel arrangement, and insulator 1 roughly is the I shape, and first fagging 12 is pegged graft between two plate bodies and is used for supporting two plate bodies in order to prevent that two plate bodies are close to each other. The strength of the insulator 1 is increased by the first supporting plate 12, and the first plate 6 and the second plate 13 are supported by the first supporting plate 12, thereby preventing the first plate and the second plate from deforming close to each other and being used badly.

Preferably, the first plate body 6 and the second plate body 13 are both provided with insertion grooves, the two ends of the first supporting plate 12 are both provided with insertion plates, and the insertion plates at the two ends of the first supporting plate 12 are respectively inserted into the insertion grooves of the first plate body 6 and the insertion grooves of the second plate body 13.

The first terminal 3 has a first leg 15 bent from the first contact portion 9, the first terminal 3 is substantially L-shaped, one end of the first leg 15 is mounted on the first protrusion 7, the second plate 13 is used for pressing and holding the external circuit board, and the other end of the first leg 15 penetrates through the second plate 13 and is used for being welded on the external circuit board.

The second terminal 4 has a second fillet 16 bent from the second contact portion 11, the second terminal 4 is substantially L-shaped, one end of the second fillet 16 is mounted on the second bump 8, the other end of the second fillet 16 penetrates the second plate 13 and is used for being welded on the circuit board, and the first fillet 15 and the second fillet 16 are located between the first supporting plates 12. The first leg 15 and the second leg 16 are separated by the first stay 12, and the legs are prevented from deforming close to each other and being used badly.

Still include second fagging 17, first fagging 12, second fagging 17 is located the left and right sides of stem 14 respectively, second fagging 17 has the main part, set up picture peg 18 and buckle 19 on the same one side both ends of main part respectively, second fagging 17 roughly is the U type, picture peg 18, buckle 19 are located the both ends that second fagging 17 kept away from each other respectively, second plate body 13 has the jack that is used for holding picture peg 18, one side that second plate body 13 was kept away from to first plate body 6 is equipped with the catching groove, the one end that main part was kept away from to buckle 19 is equipped with the discount that is used for detaining the catching groove.

By means of the matching of the inserting plate 18 and the buckling plate 19, the first plate body 6 and the second plate body 13 are buckled by the second supporting plate 17, the first plate body 6 and the second plate body 13 are prevented from being away from each other and deforming, the first plate body 6 and the second plate body 13 are stably positioned at required positions, and the stability of the service performance of the electromagnetic relay is ensured.

The electromagnet comprises an iron core 21, a coil 22 and a yoke 23, wherein the iron core 21 penetrates through the core column 14, the coil 22 is wound on the outer side of the core column 14 and is positioned between the two plate bodies, the coil 22 is positioned between the two supporting plates, and the first plate body 6 and the second plate body 13 are used for stopping the limiting coil 22, so that the coil 22 is prevented from moving along the axial direction of the core column 14 and being poor in use.

The yoke 23 is substantially L-shaped, the yoke 23 includes a first iron plate 24 and a second iron plate 25 bent from the first iron plate 24, the first iron plate 24 penetrates through the inserting plate 18 and is inserted into the second plate 13, and one end of the iron core 21 is riveted on the first iron plate 24; one side of the second supporting plate 17, which is far away from the core column 14, is provided with a containing blind groove 26 for containing the second iron plate 25, and the second iron plate 25 is limited by the side surface of an inner groove of the containing blind groove 26, so that the second iron plate 25 is prevented from moving back and forth and being badly used. One end of the armature 5 is pressed against the second iron plate 25, and the other end of the iron core 21 protrudes out of the first plate 6 and is used for sucking the other end of the armature 5.

The movable terminal 2 is substantially L-shaped, the movable terminal 2 includes a first spring 27 and a second spring 28 formed by bending the first spring 27, the first spring 27 is riveted on the second iron plate 25, the second iron plate 25 has a riveting column, and the first spring 27 has a riveting hole for accommodating the riveting column. The armature 5 is arranged on the second spring 28, a yielding through hole exposing the armature 5 is formed at the bent part of the first spring 27 and the second spring 28, the first spring 27 is provided with a lug part 29 positioned in the yielding through hole, and the lug part 29 is used for stopping and abutting against one end of the armature 5 far away from the third contact part. The end face abutting against one end of the armature 5 is stopped by the tab portion 29, ensuring that the armature 5 is stably and accurately pressed against the second iron plate 25.

The movable terminal 2 further comprises two lug pieces 31 which are arranged on the same side of the first reed 27 and far away from two ends of the first reed, the lug pieces 31 are provided with reverse buckles 32 formed by tearing and bending, the reverse buckles 32 are positioned between the two lug pieces 31, the two lug pieces 31 are respectively positioned on two sides of the second iron plate 25 and inserted into the accommodating blind grooves 26, and free ends of the reverse buckles 32 are used for abutting against one side, far away from the first reed 27, of the second iron plate 25.

By means of the arrangement of the lug pieces 31 and the reverse buckles 32, the two lug pieces 31 are stably inserted into the accommodating blind grooves 26, and by means of the stopping and abutting of the second iron plate 25 against the reverse buckles 32, the first reed 27 is stably installed on the second iron plate 25, so that the first reed 27 is prevented from being separated from the second iron plate 25 and being badly used.

The first reed 27 has a third solder leg 33 penetrating through the second board body 13, the first solder leg 15 and the second solder leg 16 are respectively located at two sides of the same end of the second board body 13, which are far away from each other, the third solder leg 33 and the first solder leg 15 are respectively located at two ends of the second board body 13, which are far away from each other, and the third solder leg 33 is located in the middle of the second board body 13; the end of the second board body 13 away from the first solder leg 15 has two power terminals 34, the power terminals 34 are used for connecting the coil 22, two ends of the coil 22 are electrically connected to the two power terminals 34 respectively, and the fourth solder legs of the two power terminals 34 are located on two sides of the same end of the second board body 13 away from each other.

By means of the layout arrangement of the first welding foot 15, the second welding foot 16, the third welding foot 33 and the fourth welding foot, all parts of the insulator 1 are stably connected to the circuit board, and poor use caused by uneven stress of the joints of different parts of the insulator 1 and the circuit board is avoided.

Preferably, power supply terminal 34 disposes the wiring portion, and the wiring portion has spiral blind groove, and spiral blind groove is established from the surface concave of wiring portion and is formed, and spiral blind groove is along the length direction spiral of wiring portion and establish, and coil 22 is used for holding and establishes in spiral blind groove, after coil 22's tip winding is in the outside of wiring portion and is located spiral blind groove, add soldering tin in spiral blind groove, increase the soldering tin between coil 22 and the wiring portion with the help of spiral blind groove and keep the volume, ensure that coil 22 and wiring portion weld together firmly. Preferably, the second board body 13 is provided with a hole, the wiring portion is located in the hole, and the hole is used for accommodating soldering tin.

Two lugs all are provided with spacing blind grooves, and spacing blind grooves are established from the one side that two lugs are close to each other concavely and are formed, and moving terminal 2 still includes two fins that set up the both sides of keeping away from each other at third contact site respectively, and two fins hold the spacing blind grooves of establishing two lugs respectively.

In the moving process of the movable terminal 2, the inner groove side surface of the limiting blind groove is used for stopping and abutting against the fin, so that the moving of the fin is limited, the moving stroke of the movable spring piece is limited, and the poor use caused by excessive moving is avoided.

Still include with insulator 1 complex plastic shell 35, plastic shell 35 has and is used for holding the holding chamber of establishing insulator 1, armature 5, moving terminal 2, quiet terminal, and second plate body 13 is used for hiding the opening in holding chamber, and the centre gripping of second contact site 11 is between the bottom surface in lug and holding chamber. When the movable terminal 2 moves back and forth, the movable terminal 2 contacts and conducts the first contact portion 9 or the second contact portion 11, at this time, the movable terminal 2 collides with the first contact portion 9 or the second contact portion 11, the first contact portion 9 is blocked and abutted by the first plate body 6, the second contact portion 11 is blocked and abutted by the inner cavity side surface of the accommodating cavity of the plastic shell 35, the first contact portion 9 and the second contact portion 11 are prevented from moving due to the collision of the movable terminal 2, and the first contact portion 9 and the second contact portion 11 are ensured to be stably positioned at the required positions.

The first plate 6 has a positioning hole, and the plastic shell 35 has a positioning column located in the accommodating cavity and inserted into the positioning hole. By arranging the positioning hole on the first plate body 6, after the plastic shell 35 and the insulator 1 are installed and fixed together, the positioning column is arranged in the positioning hole, the positioning column is stopped and abutted by the inner hole side surface of the positioning hole, so that the first plate body 6 is stably positioned, and the first plate body 6 is prevented from swinging in the accommodating cavity and is not used well.

The plastic shell 35 is provided with a vent hole 36 communicated with the accommodating cavity, the vent hole 36 is arranged on the side wall of the plastic shell 35, and the vent hole 36 penetrates through the side wall of the plastic shell 35; along the central axis direction of the air holes 36, the air holes 36 are wavy. In the use process of the electromagnetic relay, the coil 22 of the electromagnet generates heat after being electrified, so that the temperature in the plastic shell 35 rises, the air in the plastic shell 35 is automatically discharged through the air holes 36 after expanding, and the plastic shell 35 is prevented from being burst due to overlarge pressure. When external water enters the air holes 36, the wave-shaped wave crest blocks the external water, so that the waterproof effect is realized. Preferably, the medial surface facing of the holding chamber of plastic shell 35 is equipped with waterproof ventilative diaphragm 37, and waterproof ventilative diaphragm 37 makes the air pass through, separates the passing through of water, promotes water-proof effects.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.