Electromagnetic relay

Abstract

The utility model discloses an electromagnetic relay, which comprises a base, a magnetic circuit part and a contact part arranged in the base, the magnetic circuit part comprises a yoke iron frame and a coil frame arranged in the yoke iron frame, a movable iron core is arranged in the coil frame, and the movable iron core is connected with a push rod; the middle cover is connected to the base and covers the contact part, a connecting structure is convexly arranged on one surface, back to the base, of the middle cover, the yoke frame is arranged on the middle cover, and the connecting structure is connected with the yoke frame through a fastener so as to fix the yoke frame; and one end of the push rod passes through the middle cover so as to be matched with the contact part. According to the utility model, the contact part and the magnetic circuit part are separated by using the middle cover, so that the creepage distance between the contact part and the magnetic circuit part is greatly increased. According to the utility model, the connecting structure arranged on the middle cover in the protruding manner is connected with the yoke frame arranged on the middle cover through the fastener, so that the firmness of the connection between the yoke frame and the middle cover can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a direct-acting electromagnetic relay. Background Art

[0002] An electromagnetic relay is an electronic control device that is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0003] A direct-acting relay is a type of electromagnetic relay. Its core structure consists of a magnetic circuit and a contact. The magnetic circuit and contact parts are usually arranged in an upper and lower layer configuration. When the upper and lower layers are used, the contact part is usually on top and the magnetic circuit part is on the bottom. However, this configuration causes the relay's pins to be led upward, and the relay can only be electrically connected by wires when in use, rather than being directly plugged into a circuit board. To address this issue, some relays use a layout with the contact part at the bottom and the magnetic circuit part at the top. However, this configuration has the following drawbacks: the magnetic circuit part is directly fixed to the base where the contact part is located, resulting in insufficient creepage distance between the contact parts (i.e., strong and weak electricity). In particular, when the contact part is used in a high-voltage environment, the insufficient creepage distance between the contact parts poses a safety hazard. Utility Model Content

[0004] The utility model aims to solve the technical problems existing in the prior art and provides an electromagnetic relay, which greatly increases the creepage distance between the magnetic circuit part and the contact part through structural improvement.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an electromagnetic relay, including a base, a magnetic circuit part and a contact part arranged in the base, the magnetic circuit part including a yoke frame and a coil frame arranged in the yoke frame, the coil frame is provided with a moving iron core, and the moving iron core is connected to a push rod; it also includes a middle cover, which is connected to the base and covers the contact part, and the middle cover has a connecting structure protruding from the side facing away from the base, the yoke frame is placed on the middle cover, and the connecting structure is connected to the yoke frame by fasteners to fix the yoke frame; one end of the push rod passes through the middle cover to cooperate with the contact part.

[0006] Furthermore, the connection structure includes a plurality of connection columns distributed on the outside of the yoke frame, and the yoke frame is provided with a protrusion protruding outward corresponding to each connection column. The protrusion is placed on the tail end of the corresponding connection column and is connected to the corresponding connection column using the fastener.

[0007] Furthermore, the yoke frame includes two side walls arranged opposite to each other, and a top wall and a bottom wall arranged between the two side walls. The coil frame is fixed between the top wall and the bottom wall, and the bottom wall rests on the middle cover; the protrusion is arranged on the top wall.

[0008] Furthermore, the yoke frame includes a U-shaped first yoke and a flat-plate-shaped second yoke, the two ends of the first yoke are respectively fixedly connected to the two ends of the second yoke, and the opposite sides of the first yoke constitute the two side walls, the middle part of the first yoke constitutes the bottom wall, and the second yoke constitutes the top wall.

[0009] Furthermore, the plurality of connecting columns are distributed on the outer sides of the two side walls of the yoke frame, and the protrusions are provided on the top wall of the yoke frame and protrude beyond the outer side surfaces of the side walls of the yoke frame.

[0010] Furthermore, the side surfaces of each connecting column facing the yoke frame respectively include limiting surfaces, which touch the outer side surfaces of the side walls of the yoke frame; the side surfaces of each connecting column facing the yoke frame also respectively include guide surfaces, which extend at least to the tail of the connecting column and are inclined outward to guide the yoke frame into the space formed between the multiple connecting columns.

[0011] Furthermore, the fastener includes a bolt and a nut provided on the connecting column, and the screw rod of the bolt passes through the protrusion and is threadedly connected to the nut.

[0012] Furthermore, the connecting column is provided with an installation channel passing through the middle cover, the nut is installed into the installation channel from the side of the middle cover facing the base, the tail end of the bolt does not pass through the installation channel, and there is a distance between the tail end of the bolt and the middle cover.

[0013] Furthermore, a positioning structure is provided between the bottom wall of the yoke frame and the middle cover, and the positioning structure includes a positioning protrusion and a positioning groove that are embedded in each other. One of the bottom wall and the middle cover is provided with the positioning protrusion, and the other of the bottom wall and the middle cover is provided with the positioning groove.

[0014] Furthermore, the side of the middle cover facing away from the base is provided with limiting ribs at at least two hanging corners of the yoke frame to limit the yoke frame in the length direction and / or width direction of the middle cover; the limiting ribs are L-shaped to adapt to the adjacent two sides of the corner of the yoke frame.

[0015] Furthermore, the contact part includes a contact support, one or more moving contact bridges and a static contact assembly arranged corresponding to the moving contact bridges, and moving contacts are respectively provided at both ends of the moving contact bridge. The static contact assembly includes two static contacts, and the two static contacts are respectively provided with static contacts arranged opposite to the moving contacts at both ends of the moving contact bridge; the contact support is movably arranged in the base, and a reset spring is arranged between the base and the static contact; the static contact is inserted into the base; one end of the push rod cooperates with the contact support to push the contact support to move, so that the moving contact and the static contact are closed or disconnected.

[0016] Furthermore, it also includes a shell, which is connected to the middle cover and / or the base and covers the magnetic circuit part.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention connects a middle cover to the base, using it to separate the contact portion from the magnetic circuit portion, significantly increasing the creepage distance between the contact portion and the magnetic circuit portion. Furthermore, the present invention includes a protruding connection structure on the side of the middle cover facing away from the base. This connection structure utilizes fasteners to connect to a yoke frame positioned on the middle cover. This improves the secure connection between the yoke frame and the middle cover, preventing the risk of the yoke frame loosening due to impact vibration caused by the movement of the moving iron core during long-term use. Furthermore, it avoids the use of fasteners to directly connect the yoke frame to the middle cover, which would reduce the creepage distance between the contact portion and the magnetic circuit portion.

[0019] 2. The connection structure includes multiple connecting columns distributed outside the yoke frame, making the connection structure easy to process and forming, and relatively saving materials. The yoke frame is provided with a protruding block corresponding to each connecting column. The protruding block connects to the connecting column, which can avoid damaging the integrity of the yoke frame and reducing the magnetic conductivity of the yoke frame.

[0020] 3. The yoke frame includes the first yoke and the second yoke, and the second yoke constitutes the top wall of the yoke frame, so that the flat-plate-shaped second yoke is arranged away from the middle cover and is provided with the protrusion, so that when the magnetic circuit part is released, the impact force is directly transmitted to the middle cover only through the second yoke. This not only simplifies the riveting scheme of the first yoke and the second yoke, but also further stabilizes the positioning of the magnetic circuit part and the middle cover, thereby ensuring the position stability of the magnetic circuit part and the contact part, and improving the action consistency and stability of the whole machine.

[0021] 4. The fastener preferably includes a bolt and a nut positioned within the connecting column. This improves the secure connection between the projection and the connecting column and avoids drawbacks such as deformation and plastic shavings caused by direct threaded connection of the fastener to the connecting column. Specifically, the nut is installed into the mounting channel from the side of the middle cover facing the base, making the nut and connecting column more convenient and easier to assemble. The tail end of the bolt does not extend beyond the mounting channel, and a gap exists between the tail end of the bolt and the middle cover. This prevents the tail end of the bolt from approaching the contact portion, which would reduce the creepage distance between the contact portion and the magnetic circuit portion.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the electromagnetic relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded schematic diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the middle cover of the utility model;

[0025] Figure 3 This is an exploded schematic diagram of the magnetic circuit portion of the present invention (the push rod is not shown);

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the yoke frame of the present invention;

[0027] Figure 5 It is a cross-sectional view of the magnetic circuit portion of the present invention (partially not shown);

[0028] Figure 6 It is a top view of the magnetic circuit part and the middle cover of the utility model in the assembled state;

[0029] Figure 7 It is a cross-sectional view of the magnetic circuit part and the middle cover of the utility model in the assembled state;

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the utility model;

[0031] Figure 9 It is a top view of the utility model;

[0032] Figure 10 It is a CC sectional view of the present utility model;

[0033] In the figure, 1. base; 11. compartment; 2. magnetic circuit part; 21. yoke frame; 211. first yoke; 2111. positioning protrusion; 2112. riveted protrusion; 212. second yoke; 2121. protrusion; 2121. riveted recess; 22. coil frame; 23. coil; 24. moving iron core; 25. push rod; 26. static iron core; 27. coil lead-out pin; 3. contact part; 31. contact support; 32. moving contact bridge; 33. moving contact; 34. static contact; 35. static contact; 36. contact spring; 4. middle cover; 41. clearance hole; 42. connecting column; 421. limiting surface; 422. guide surface; 423. installation channel; 5. bolt; 6. nut; 7. reset spring; 8. outer shell. DETAILED DESCRIPTION

[0034] In the present invention, the terms "first" and "second" are used only to distinguish similar objects, rather than to describe a specific order or precedence, and should not be understood as indicating or implying relative importance. In the description, the use of terms such as "upper," "lower," "inner," "outer," and "top / bottom" to indicate positions or location relationships is based on the positions or location relationships shown in the accompanying drawings and is intended only to facilitate the description of the present invention. They do not indicate or imply that the device referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be understood as limiting the scope of protection of the present invention. Those skilled in the art can understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] In the description of this utility model, unless otherwise specified, "plurality" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the related objects are in an "or" relationship.

[0036] See Figures 1-10 As shown, an electromagnetic relay of the present invention includes a base 1, a magnetic circuit portion 2, and a contact portion 3 disposed in the base 1. The magnetic circuit portion 2 includes a yoke frame 21 and a coil frame 22 disposed in the yoke frame 21 and wound with a coil 23. A moving iron core 24 is provided in the coil frame 22, and a push rod 25 is coaxially connected to the moving iron core 24. The present invention also includes a middle cover 4, which is connected to the base 1 and covers the contact portion 3. The middle cover 4 has a protruding connection structure on the side facing away from the base 1. The yoke frame 21 is placed on the middle cover 4, and the connection structure is connected to the yoke frame 21 using fasteners to fix the yoke frame 21. One end of the push rod 25 passes through the middle cover 4 to cooperate with the contact portion 3. Therefore, the middle cover 4 has a clearance hole 41 corresponding to the push rod 25.

[0037] The aforementioned connection structure includes multiple connecting posts 42 distributed outside the yoke frame 21, resulting in a simpler construction, easier processing and molding, and greater material savings. The yoke frame 21 is provided with a protruding block 2121 extending outward from each connecting post 42. These protrusions 2121 rest on the tail end of the corresponding connecting post 42 and are connected to the corresponding connecting post 42 using fasteners. This allows the protrusions 2121 to connect to the connecting posts 42, preventing damage to the integrity of the yoke frame 21 and reducing its magnetic conductivity.

[0038] The yoke frame 21 includes two side walls arranged opposite to each other, and a top wall and a bottom wall arranged between the two side walls. The coil frame 22 is fixed between the top wall and the bottom wall, and the bottom wall rests on the middle cover 4. Therefore, the yoke frame 21 has a vertical frame structure, and its four sides are straight edges. The above-mentioned multiple connecting columns 42 are distributed on the outside of the two side walls of the yoke frame 21, and the protrusion 2121 is provided on the top wall of the yoke frame 21 and protrudes beyond the outer side surface of the side wall of the yoke frame 21. Specifically, the number of the connecting columns 42 is two, and the two connecting columns 42 are respectively distributed along the length direction of the middle cover 4 and are centrally arranged on the corresponding two sides of the yoke frame 21. In other embodiments, the connecting columns 42 are set to three or four, etc.

[0039] The yoke frame 21 specifically includes a first yoke 21 that is roughly U-shaped and a second yoke 22 that is flat. The two ends of the first yoke 21 are fixedly connected to the two ends of the second yoke 22. Specifically, the two ends of the first yoke 21 are riveted to the two ends of the second yoke 22, and the two ends of the first yoke 21 are respectively provided with riveted protrusions 2112. The second yoke 22 is respectively provided with riveted recesses 2122 corresponding to each riveted protrusion 2112, and each riveted protrusion 2112 is riveted and engaged with a corresponding riveted recess 2122. The two opposite sides of the first yoke 21 constitute the two side walls of the yoke frame 21, the middle portion of the first yoke 21 constitutes the bottom wall of the yoke frame 21, and the second yoke 22 constitutes the top wall of the yoke frame 21 and is integrally formed with a protrusion 2121. Therefore, the flat-plate-shaped second yoke 22 is arranged away from the middle cover 4, and is connected to the connecting column 42 on the middle cover 4 by the protrusion 2121, so that when the magnetic circuit part 2 is released, the impact force is only directly transmitted to the middle cover 4 through the second yoke 22, and will not be transmitted to the first yoke 21, so that the riveting quality requirements of the first yoke 21 and the second yoke 22 are low, and the riveting scheme of the first yoke 21 and the second yoke 22 can be simplified. At the same time, the positioning of the magnetic circuit part 2 and the middle cover 4 is further stabilized, thereby ensuring the position stability of the magnetic circuit part 2 and the contact part 3, and improving the action consistency and stability of the whole machine.

[0040] The side of each connecting post 42 facing the yoke frame 21 includes a limiting surface 421, which contacts the outer side of the side wall of the yoke frame 21. That is, the limiting surface 421 of each connecting post 42 contacts the outer side of the first yoke 21, and the limiting surface 421 is a straight surface. In this way, the connecting post 42 can be used to laterally limit the yoke frame 21, further improving the positional stability of the magnetic circuit portion 2 and also playing a role in the installation and positioning of the yoke frame 21. The side of each connecting post 42 facing the yoke frame 21 also includes a guide surface 422, which extends at least to the tail of the connecting post 42 and is tilted outward to guide the yoke frame 21 into the space formed between the multiple connecting posts 42, thereby improving the installation efficiency of the yoke frame 21.

[0041] The above-mentioned fasteners may include screws, or may include bolt assemblies, etc., wherein the bolt assembly includes bolts 5 and nuts 6 that match each other. As a preferred embodiment, the fastener includes a bolt assembly, and the nut 6 is provided on the connecting column 42, and the screw rod of the bolt 5 passes through the protrusion 2121 and enters the connecting column 42 to be threadedly connected with the nut 6. The provision of the nut 6 makes it unnecessary for the fastener to be directly threadedly connected to the connecting column 42, thereby preventing the connecting column 42 from being deformed, generating plastic chips, etc., and improving the connection firmness between the protrusion 2121 and the connecting column 42. The connecting column 42 is provided with a mounting channel 423 that passes through the middle cover 4, and the nut 6 is installed in the mounting channel 423 from the side of the middle cover 4 facing the base 1, and the nut 6 can be provided as a flat structure, which cooperates with the mounting channel 423 with a flat cross section to prevent the nut 6 from rotating. In other embodiments, the nut 6 and the connecting column 42 are integrally insert-molded. The tail end of the bolt 5 does not pass through the mounting channel 423, and there is a distance between the tail end of the bolt 5 and the middle cover 4, such as Figure 7 As shown, the tail end of the bolt 5 can be prevented from being close to the contact portion 3 and reducing the creepage distance between the contact portion 3 and the magnetic circuit portion 2.

[0042] A positioning structure is provided between the bottom wall of the yoke frame 21 (i.e., the middle portion of the first yoke 21) and the middle cover 4. The positioning structure includes a positioning protrusion and a positioning groove that fit together. One of the bottom wall and the middle cover 4 is provided with a positioning protrusion, and the other of the bottom wall and the middle cover 4 is provided with a positioning groove. Specifically, the positioning groove 43 is provided on the side of the middle cover 4 facing away from the base 1 and does not pass through the bottom surface of the middle cover 4. The positioning protrusion 2111 is provided on the first yoke 21, as shown in FIG. Figure 2-Figure 6 As shown, the number of the positioning grooves 43 and the number of the positioning protrusions 2111 are four respectively, but not limited to this.

[0043] The side of the middle cover 4 facing away from the base 1 is provided with limiting ribs 44 at at least two corners of the yoke frame 21 to limit the yoke frame 21 in the length direction and / or width direction of the middle cover 4. The limiting ribs 44 are L-shaped to fit the adjacent two sides of the corner of the yoke frame 21. Specifically, two limiting ribs 44 are used as an example, such as Figure 6 As shown, the two limiting ribs 44 are distributed along the width direction of the middle cover 4 and can limit the yoke frame 21 in the length direction and width direction of the middle cover 4, thereby further improving the position stability of the magnetic circuit part.

[0044] The contact portion 3 comprises a contact support 31, a movable contact bridge 32, and a stationary contact assembly corresponding to the movable contact bridge 32. The movable contact bridge 32 is provided with a movable contact 34 at each end. The stationary contact assembly includes two stationary contacts 33, each of which has a stationary contact 35 positioned opposite the movable contact 34 at each end of the movable contact bridge 32. The contact support 31 is movably disposed within the base 1, with a return spring 7 disposed between the contact support 31 and the base 1. The stationary contacts 33 are inserted into the base 1. Specifically, there are multiple movable contact bridges 32, spaced apart along the length of the contact support 31. A contact spring 36 is disposed between each movable contact bridge 32 and the contact support 31. The contact spring 36 is located on the side of the movable contact bridge 32 facing away from the stationary contact 33 to provide contact overtravel and closing pressure. The accompanying drawings illustrate four movable contact bridges 32 as an example. Therefore, the present invention is applicable to three-phase four-wire or three-phase five-wire AC systems. The base 1 is provided with a partition cavity 11 corresponding to each moving contact bridge 32 and its matched static contact assembly, so that each moving contact bridge 32 is located in a different partition cavity 11 to isolate the contacts between different phases, thereby increasing the creepage distance between adjacent phases.

[0045] One end of the push rod 25 engages with the contact support 31 to push the contact support 31, thereby closing or opening the movable contact 34 and the stationary contact 35. Specifically, the contact support 31 is pushed by the push rod 25, driving the movable contact bridges 32 in the contact closing direction, closing the movable contact 34 and the stationary contact 35. When the push rod 25 releases the contact support 31, the contact support 31, under the action of the return spring 7, drives the movable contact bridges 32 in the contact opening direction, opening the movable contact 34 and the stationary contact 35.

[0046] Magnetic circuit section 2 also includes a static iron core 26, housed within coil bobbin 22. This static iron core 26 is fixedly mounted through the bottom wall of yoke frame 21 (i.e., the middle portion of first yoke 21). The movable iron core 24 is movably mounted through the top wall of yoke frame 21 (i.e., second yoke 22). One end of the push rod 25 passes through static iron core 26. The two coil lead pins 27 of magnetic circuit section 2 extend downward through middle cover 4 and are mounted on base 1.

[0047] The present invention further includes a housing 8, which is connected to the middle cover 4 and / or the base 1 and covers the magnetic circuit portion 2. Specifically, the housing 8 is connected to the middle cover 4 by a snap-fit ​​connection, and the middle cover 4 is also snap-fitted to the base 1. However, the snap-fit ​​connection is not the only connection method, and any other feasible connection method may be used.

[0048] The electromagnetic relay of the present invention operates as follows: When power is supplied to the coil 23, the magnetic circuit portion 2 generates a magnetic field. The yoke frame 21 guides the magnetic field generated by the coil 23 and strengthens the magnetic field. The movable iron core 24, attracted by the stationary iron core 26, moves downward with the push rod 25. The push rod 25 pushes the contact support 31 downward, causing each movable contact 34 to close with the corresponding stationary contact 35. When power is removed from the coil 23, the magnetic field generated by the magnetic circuit portion 2 disappears, and the contact support 31 is reset upward by the reset spring 7, disconnecting the movable contact 34 from the stationary contact 35 and causing the push rod 25 and movable iron core 24 to reset upward.

[0049] The electromagnetic relay of the present invention utilizes a middle cover 4 to separate the contact portion 3 from the magnetic circuit portion 2, significantly increasing the creepage distance between the contact portion 3 and the magnetic circuit portion 2. Furthermore, the present invention includes a protruding connection structure on the side of the middle cover 4 facing away from the base 1. This connection structure utilizes fasteners to connect to a yoke frame 21 disposed on the middle cover 4. This improves the secure connection between the yoke frame 21 and the middle cover 4, preventing the risk of the yoke frame 21 loosening due to impact vibration caused by the movement of the moving iron core 24 during long-term use. Furthermore, it avoids the risk of the yoke frame 21 being directly connected to the middle cover 4 using fasteners, which would reduce the creepage distance between the contact portion 3 and the magnetic circuit portion 2.

[0050] The electromagnetic relay of the present invention is the same as that of the prior art, and the parts not involved are the same as those of the prior art or can be implemented by using the prior art.

[0051] The above embodiments are only used to further illustrate an electromagnetic relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. An electromagnetic relay comprising a base, a magnetic circuit portion, and a contact portion disposed in the base, wherein the magnetic circuit portion comprises a yoke frame and a coil frame disposed in the yoke frame, wherein the coil frame is provided with a moving iron core, and the moving iron core is connected to a push rod; characterized in that: It also includes a middle cover, which is connected to the base and covers the contact part, and a connecting structure is protruding from the side of the middle cover facing away from the base. The yoke frame is placed on the middle cover, and the connecting structure is connected to the yoke frame using fasteners to fix the yoke frame; one end of the push rod passes through the middle cover to cooperate with the contact part.

2. The electromagnetic relay according to claim 1, wherein: The connection structure includes a plurality of connection columns distributed on the outside of the yoke frame. The yoke frame is provided with a protrusion protruding outward corresponding to each connection column. The protrusion is placed on the tail end of the corresponding connection column and is connected to the corresponding connection column using the fastener.

3. The electromagnetic relay according to claim 2, wherein: The yoke frame includes two side walls arranged opposite to each other, and a top wall and a bottom wall arranged between the two side walls. The coil frame is fixed between the top wall and the bottom wall, and the bottom wall rests on the middle cover. The protrusion is arranged on the top wall.

4. The electromagnetic relay according to claim 3, wherein: The yoke frame includes a U-shaped first yoke and a flat-plate-shaped second yoke. The two ends of the first yoke are fixedly connected to the two ends of the second yoke respectively, and the opposite sides of the first yoke constitute the two side walls, the middle part of the first yoke constitutes the bottom wall, and the second yoke constitutes the top wall.

5. The electromagnetic relay according to claim 3 or 4, characterized in that: The plurality of connecting columns are distributed on the outer sides of the two side walls of the yoke frame. The protrusion is arranged on the top wall of the yoke frame and protrudes out of the outer side surfaces of the side walls of the yoke frame.

6. The electromagnetic relay according to claim 5, characterized in that: The side surfaces of each connecting column facing the yoke frame respectively include limiting surfaces, which touch the outer side surfaces of the side walls of the yoke frame; the side surfaces of each connecting column facing the yoke frame also respectively include guide surfaces, which extend at least to the tail of the connecting column and are inclined outward to guide the yoke frame into the space formed between the multiple connecting columns.

7. The electromagnetic relay according to claim 2, wherein: The fastener comprises a bolt and a nut arranged on the connecting column, and the screw rod of the bolt passes through the protrusion and is threadedly connected with the nut.

8. The electromagnetic relay according to claim 7, wherein: The connecting column is provided with an installation channel passing through the middle cover, and the nut is installed into the installation channel from the side of the middle cover facing the base. The tail end of the bolt does not pass through the installation channel, and there is a distance between the tail end of the bolt and the middle cover.

9. The electromagnetic relay according to claim 3 or 4, characterized in that: A positioning structure is provided between the bottom wall of the yoke frame and the middle cover, and the positioning structure includes a positioning protrusion and a positioning groove that are interlocked with each other. One of the bottom wall and the middle cover is provided with the positioning protrusion, and the other of the bottom wall and the middle cover is provided with the positioning groove.

10. The electromagnetic relay according to any one of claims 1 to 4, characterized in that: The side of the middle cover facing away from the base is provided with limiting ribs at at least two hanging corners of the yoke frame to limit the yoke frame in the length direction and / or width direction of the middle cover; the limiting ribs are L-shaped to adapt to the adjacent two sides of the corner of the yoke frame.

11. The electromagnetic relay according to claim 1, wherein: The contact part includes a contact support, one or more moving contact bridges and a static contact assembly arranged corresponding to the moving contact bridges, and moving contacts are respectively provided at both ends of the moving contact bridge. The static contact assembly includes two static contacts, and the two static contacts are respectively provided with static contacts arranged opposite to the moving contacts at both ends of the moving contact bridge; the contact support is movably arranged in the base, and a reset spring is provided between the base and the static contact; the static contact is inserted into the base; one end of the push rod cooperates with the contact support to push the contact support to move, so that the moving contact and the static contact are closed or disconnected.

12. The electromagnetic relay according to claim 1, wherein: It also includes a shell, which is connected to the middle cover and / or the base and covers the magnetic circuit part.

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