Extended electromagnetic relay

Abstract

An extended electromagnetic intermediate relay, a body unit is detachably installed with an upper auxiliary unit and / or a side auxiliary unit; the bottom of the upper auxiliary unit is provided with a first limiting structure and a first elastic arm, the first elastic arm is provided with a clamping head, the top of the body unit is provided with a second limiting structure for inserting with the first limiting structure in the first direction, the top of the body unit is also provided with a groove for clamping with the clamping head, limiting the displacement of the body unit and the upper auxiliary unit in the first direction; the upper part of the side wall of the body unit is provided with two first insertion slots in the first direction, the lower part of the side wall of the body unit is provided with two second insertion slots in the first direction, the side auxiliary unit is provided with a first hook body for buckling with the first insertion slot, the lower part of the side wall of the side auxiliary unit is provided with a pair of second elastic arms, the end of the second elastic arm is provided with a second hook body for buckling with the second insertion slot, so as to firmly connect the structure and facilitate the disassembly of the auxiliary contact unit.

Description

Technical Field

[0001] This utility model relates to the field of intermediate relay technology, and in particular to an extended electromagnetic intermediate relay. Background Technology

[0002] An intermediate relay is an electromagnetic switching device mainly used to expand the number of contacts for functions such as signal transmission, control of multiple circuits, and electrical isolation.

[0003] To increase the number of contacts in a single intermediate relay, auxiliary contact units are typically installed on the upper and side surfaces of the relay. The moving parts of the auxiliary contact units are connected to the moving parts of the intermediate relay body. When the moving parts of the intermediate relay body move, they cause the moving contacts on the auxiliary contact units to move. Since the movement of the moving parts will cause the intermediate relay to vibrate, it is essential to ensure the robustness of the connection structure between the intermediate relay body and the auxiliary contact units.

[0004] Using bolted connections can ensure the secure connection between the intermediate relay body unit and the auxiliary contact unit, but the installation and disassembly time is relatively long. Using snap-fit ​​connections, in order to ensure the secure connection, will cause inconvenience in disassembly. Utility Model Content

[0005] To address the shortcomings of the existing manufacturing technology, the applicant provides an extended electromagnetic intermediate relay, which, while ensuring the robustness of the connection structure between the intermediate relay body unit and the auxiliary contact unit, facilitates the disassembly of the auxiliary contact unit.

[0006] The technical solution adopted in this utility model is as follows: An extended electromagnetic intermediate relay includes a main body unit, on which an upper auxiliary unit and / or a side auxiliary unit are detachably mounted; The bottom of the upper auxiliary unit is provided with a first limiting structure and a first elastic arm. The first elastic arm is provided with a locking head. The top of the main body unit is provided with a second limiting structure for inserting into the first limiting structure along the first direction, thereby limiting the displacement of the main body unit and the upper auxiliary unit in two mutually perpendicular second directions and a third direction. The second direction and the third direction are both perpendicular to the first direction. The second direction is consistent with the movement direction of the main body movable frame inside the main body unit. The top of the main body unit is also provided with a groove for engaging with the locking head, thereby limiting the displacement of the main body unit and the upper auxiliary unit along the first direction. The upper part of the side wall of the main body unit has two first slots spaced apart side by side along the first direction, and the lower part of the side wall of the main body unit has two second slots spaced apart side by side along the first direction. The side auxiliary unit is provided with a first hook for engaging with the first slots. The lower part of the side wall of the side auxiliary unit is provided with a pair of second elastic arms. The ends of the second elastic arms are provided with second hooks for engaging with the second slots. The engaging directions of the first hooks and the second hooks are opposite to each other along the second direction.

[0007] As a further improvement to the above technical solution: When the upper auxiliary unit is detachably and fixedly connected to the main body unit, the slider at the lower part of the upper auxiliary movable frame in the upper auxiliary unit is inserted into the slide groove on the main body movable frame along the first direction. The first limiting structure includes a pair of first protrusions arranged opposite each other along a third direction, and the second limiting structure includes a pair of second protrusions arranged opposite each other along a third direction. Each second protrusion is provided with a slot, and the two slots are arranged opposite each other along the third direction. The opening direction of the slots is one side of the first direction and one side of the third direction. When the first limiting structure and the second limiting structure are inserted, the first protrusion is located in the slot and abuts against the side wall of the slot.

[0008] The top of the main body unit is provided with a limiting block, and the limiting block and the second limiting structure are located on both sides of the slide groove along the first direction; The bottom of the upper auxiliary unit is provided with a pair of limiting buckles along the third direction. When the first limiting structure and the second limiting structure are inserted, the two limiting buckles are engaged with the limiting block to restrict the displacement of the upper auxiliary unit and the main body unit along the first direction.

[0009] The limiting buckle is provided with a guide slope. During the insertion process of the first limiting structure and the second limiting structure, the guide slope contacts the limiting block, driving the two limiting buckles to swing in opposite directions. When the limiting buckle passes the limiting block, the limiting buckle engages with the limiting block.

[0010] One end of the first elastic arm is connected to the bottom of the housing of the upper auxiliary unit, and the other end of the first elastic arm extends outward along the first direction to the upper auxiliary unit and is provided with a driving end. The first elastic arm is provided with the locking head on the side facing the groove.

[0011] A limiting slot is provided on the side wall of the main body unit between the first slot and the second slot, and a limiting plug corresponding to the limiting slot is provided on the side auxiliary unit; When the main body unit and the side auxiliary unit are detachably and fixedly connected, the limiting slot is inserted into the limiting plug, and the second hook and the limiting plug limit the side auxiliary unit along the second direction from the inside and outside of the limiting slot.

[0012] The side auxiliary unit is provided with an auxiliary insertion hole corresponding to the second elastic arm for inserting an auxiliary tool. The auxiliary tool is used to apply pressure to the second elastic arm, thereby causing elastic deformation and separating the second hook from the second slot. The second slot extends through the outer casing on one side of the body unit corresponding to the second slot along the first direction.

[0013] The second elastic arm includes a connecting arm integrally formed with the housing of the side auxiliary unit. The two connecting arms extend in opposite directions along the first direction. The end of the connecting arm is provided with an extension arm along a third direction. The end of the extension arm is located outside the housing of the side auxiliary unit and is provided with the second hook.

[0014] In the upper auxiliary unit, both the upper auxiliary movable frame and the main movable frame are provided with multiple moving contact mounting structures arranged side by side along the third direction. Each moving contact mounting structure includes: Two contact mounting slots are arranged along the second direction, and an isolation block is provided between the two contact mounting slots. Each moving contact mounting structure is equipped with a moving contact and a spring. The moving contact and the spring are arranged along the second direction. The moving contact is located between the isolation block and the spring. The spring is in a compressed state and is in contact with the moving contact, applying a spring force toward the isolation block to the moving contact. The stationary contacts on the upper auxiliary unit and the side auxiliary unit are arranged corresponding to the isolation block, and the stationary contacts are directly opposite the moving contacts.

[0015] It includes a moving contact and a stationary contact that is paired with the moving contact. Both the contact surface of the moving contact and the contact surface of the stationary contact are provided with multiple V-shaped grooves arranged side by side. The length direction of the V-groove on the moving contact is perpendicular to the length direction of the V-groove on the stationary contact.

[0016] The beneficial effects of this utility model are as follows: This utility model features a compact and reasonable structure, and is easy to operate. It incorporates a first limiting structure and a second limiting structure that interlock on the upper auxiliary unit and the main body unit, with the interlocking direction parallel to the connection surface of the upper auxiliary unit and the main body unit. This facilitates the connection between the main body movable frame and the upper auxiliary movable frame during interlocking. Furthermore, the connection structure on the upper auxiliary unit and the main body unit includes a groove and a locking structure for limiting along the first direction, achieving limiting in three directions and detachably fixing the upper auxiliary unit and the main body unit. The locking head is positioned on the first elastic arm, facilitating the disassembly of the upper auxiliary unit. Additionally, two pairs of slots and hooks arranged side-by-side along the first direction are provided on the side auxiliary unit and the main body unit, with each pair of hooks facing each other along the second direction. This detachably fixes the side auxiliary unit to the main body unit. The second hook is positioned on the side auxiliary unit via the second elastic arm, facilitating the disassembly of the side auxiliary unit. Thus, while ensuring the robustness of the connection structure between the main body unit and the auxiliary contact unit, it also facilitates the disassembly of the auxiliary contact unit.

[0017] This utility model also has the following advantages: (1) A pair of limiting buckles are provided at the bottom of the upper auxiliary unit along the third direction. When the first limiting structure and the second limiting structure are inserted, the two limiting buckles are engaged with the limiting block to restrict the displacement of the upper auxiliary unit and the main body unit along the first direction. Along the insertion direction of the upper auxiliary unit and the main body unit, limiting structures are set on both sides of the slide groove of the main body movable frame to improve the connection reliability of the upper auxiliary unit and the main body unit.

[0018] (2) A drive end is provided at the end of the first elastic arm, located outside the upper auxiliary unit, so that the operator can directly operate the drive end manually, causing the first elastic arm to undergo elastic deformation, which facilitates the movement of the chuck during installation and disassembly, and improves the ease of operation.

[0019] (3) A limiting plug and a limiting slot are provided between the fastening structure of the first hook and the second hook to realize the positioning and installation of the first hook and the first slot, while forming a support point corresponding to the second elastic arm near the second elastic arm to ensure the stability of the elastic clamping force of the second elastic arm.

[0020] (4) The second slot is a one-way through slot, which allows the position of the second hook in the second slot to be observed from the side of the main unit. Combined with the auxiliary socket, it provides operating space for the auxiliary tool and improves the convenience of disassembling and installing the side auxiliary unit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is an exploded view of the present invention.

[0023] Figure 3 This is a cross-sectional view of the present invention.

[0024] Figure 4 This is a cross-sectional view of the connection structure between the auxiliary unit and the main body unit of this utility model.

[0025] Figure 5 This is a cross-sectional view (from another perspective) of the connection structure between the auxiliary unit and the main body unit of this utility model.

[0026] Figure 6 This is a state diagram of the connection structure between the auxiliary unit and the main body unit of this utility model (when the card head is disengaged from the groove).

[0027] Figure 7 This is a schematic diagram of the top structure of the main body unit of this utility model.

[0028] Figure 8 This is a schematic diagram of the bottom structure of the auxiliary unit of this utility model.

[0029] Figure 9 This is a schematic diagram of the connection structure between the main body unit and the side auxiliary unit of this utility model.

[0030] Figure 10 This is a cross-sectional view of the connection structure between the main body unit and the side auxiliary unit of this utility model.

[0031] Figure 11 This is a schematic diagram of the structure of the second elastic arm of this utility model.

[0032] Figure 12 This is a schematic diagram of the structure of the auxiliary movable frame of this utility model.

[0033] Figure 13 This is a schematic diagram of the structure of the movable frame of the main body of this utility model.

[0034] Figure 14 This is a schematic diagram of the structure of the moving contact and the stationary contact of this utility model.

[0035] Figure 15 This is a schematic diagram of the structure of the moving contact and the stationary contact of this utility model (from another perspective).

[0036] in: 1. Upper auxiliary unit; 11. First limiting structure; 110. First protrusion; 12. First elastic arm; 120. Clamping head; 121. Driving end; 13. Upper auxiliary movable frame; 131. Slider; 14. Limiting buckle; 140. Guide slope; 2. Body unit; 21. Second limiting structure; 210. Second protrusion; 211. Slot; 22. Groove; 23. First slot; 24. Limiting slot; 25. Second slot; 26. Body movable frame; 261. Slide groove; 262. Recess; 27. Limiting block; 271. Extension block; 3. Side auxiliary unit; 30. Auxiliary socket; 31. First hook body; 32. Limiting plug; 33. Second elastic arm; 331. Connecting arm; 332. Extension arm; 330. Second hook body; 34. Side auxiliary movable frame; 341. Connecting plug; 4. Moving contact; 41. Spring; 5. Contact mounting slot; 6. Isolation block; 7. Stationary contact. Detailed Implementation

[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0038] like Figures 1-10 As shown, an extended electromagnetic intermediate relay according to an embodiment of this application includes a main body unit 2, on which an upper auxiliary unit 1 and / or a side auxiliary unit 3 are detachably mounted. The upper auxiliary unit 1 and the side auxiliary unit 3 are auxiliary contact units. The bottom of the upper auxiliary unit 1 is provided with a first limiting structure 11 and a first elastic arm 12. The first elastic arm 12 is provided with a locking head 120. The top of the main body unit 2 is provided with a second limiting structure 21 for inserting into the first limiting structure 11 along the first direction, thereby limiting the displacement of the main body unit 2 and the upper auxiliary unit 1 in two mutually perpendicular second directions and a third direction. The second direction and the third direction are both perpendicular to the first direction. The second direction is consistent with the movement direction of the main body movable frame 26 inside the main body unit 2. The top of the main body unit 2 is also provided with a groove 22 for engaging with the locking head 120, limiting the displacement of the main body unit 2 and the upper auxiliary unit 1 along the first direction, thereby making the main body unit 2 and the upper auxiliary unit 1 detachably and fixedly connected. Under the action of external force, the first elastic arm 12 undergoes elastic deformation, causing the locking head 120 to disengage from the groove 22 and disconnect from the groove 22. The upper part of the side wall of the main body unit 2 is provided with two first slots 23 arranged side by side along the first direction, and the lower part of the side wall of the main body unit 2 is provided with two second slots 25 arranged side by side along the first direction. The side auxiliary unit 3 is provided with a first hook 31 for engaging with the first slot 23. The lower part of the side wall of the side auxiliary unit 3 is provided with a pair of second elastic arms 33. The end of the second elastic arm 33 is provided with a second hook 330 for engaging with the second slot 25. The engaging directions of the first hook 31 and the second hook 330 are opposite to each other along the second direction, thereby detachably and fixedly connecting the main body unit 2 and the side auxiliary unit 3. Under the action of external force, the second elastic arm 33 undergoes elastic deformation, causing the second hook 330 to separate from the second slot 25.

[0039] Specifically, the bottom of the upper auxiliary unit 1 and the top of the main body unit 2 are opposite each other, corresponding to the second direction mentioned above; the upper and lower directions of the side wall of the main body unit 2 also correspond to the second direction. like Figure 3 As shown, when the upper auxiliary unit 1 and the main body unit 2 are detachably and fixedly connected, the upper auxiliary movable frame 13 in the upper auxiliary unit 1 is connected to the main body movable frame 26. Specifically, the connection is made by inserting the slider 131 located at the lower part of the upper auxiliary movable frame 13 into the slide groove 261 located at the top of the main body movable frame 26 along the first direction. like Figure 3 As shown, when the side auxiliary unit 3 is detachably and fixedly connected to the main body unit 2, the side auxiliary movable frame 34 in the side auxiliary unit 3 is connected to the main body movable frame 26. Specifically, the connection is made by inserting the connector 341 located on the side auxiliary movable frame 34 into the recess 262 on the main body movable frame 26 along a third direction. The housing of the main body unit 2 is provided with a stationary contact 7, and the movable frame 26 of the main body is provided with a moving contact 4; The upper auxiliary unit 1 has a stationary contact 7 on its housing and a moving contact 4 on its upper auxiliary movable frame 13. The side auxiliary unit 3 has a stationary contact 7 on its housing and a moving contact 4 on its side auxiliary movable frame 34, which are used to expand the contacts of the intermediate relay.

[0040] By setting a first limiting structure 11 and a second limiting structure 21 that are interlocked on the upper auxiliary unit 1 and the main body unit 2 respectively, with the interlocking direction parallel to the connection surface of the upper auxiliary unit 1 and the main body unit 2, it is convenient to connect the main body movable frame 26 and the upper auxiliary movable frame 13 while interlocking. In addition, the connection structure on the upper auxiliary unit 1 and the main body unit 2 also includes a groove 22 that limits the position along the first direction and a snap-fit ​​structure of a snap-fit ​​head 120, thereby achieving limiting in three directions and detachably fixing the upper auxiliary unit 1 and the main body unit 2. The snap-fit ​​head 120 is set on the first elastic arm 12 to facilitate the disassembly of the upper auxiliary unit 1. By setting two pairs of slots and hooks in parallel along the first direction on the side auxiliary unit 3 and the main body unit 2 respectively, with each pair of hooks facing each other along the second direction, the side auxiliary unit 3 and the main body unit 2 are detachably and fixedly connected. The second hook 330 is set on the side auxiliary unit 3 through the second elastic arm 33, which facilitates the disassembly of the side auxiliary unit 3. Furthermore, the extended electromagnetic intermediate relay of this embodiment satisfies the robustness of the connection structure between the main body unit 2 and the auxiliary contact unit while facilitating the disassembly of the auxiliary contact unit.

[0041] In one exemplary embodiment, such as Figures 4-8As shown, when the upper auxiliary unit 1 and the main body unit 2 are detachably and fixedly connected, the slider 131 at the lower part of the upper auxiliary movable frame 13 in the upper auxiliary unit 1 is inserted into the slide groove 261 on the main body movable frame 26 along the first direction. The first limiting structure 11 includes a pair of first protrusions 110 arranged opposite each other along a third direction, and the second limiting structure 21 includes a pair of second protrusions 210 arranged opposite each other along a third direction. Each second protrusion 210 is provided with a slot 211. The two slots 211 are arranged opposite each other along a third direction, and the opening direction of the slots 211 is one side of the first direction and one side of the third direction. When the first limiting structure 11 and the second limiting structure 21 are inserted, the first protrusion 110 is located in the slot 211 and abuts against the side wall of the slot 211.

[0042] like Figures 7-8 As shown, the first protrusion 110 is a rectangular block structure with a certain gap to the bottom of the housing of the main body unit 2. There are four side walls of the slot 211. When the first protrusion 110 abuts against the side walls of the slot 211, that is, the four sides of the first protrusion 110 and the side walls of the slot 211 are in surface contact, the insertion of the first limiting structure 11 and the second limiting structure 21 realizes the limiting in the second direction and the third direction. With the engagement of the groove 22 and the card head 120, the limiting in the first direction is realized, thereby detachably and fixedly connecting the upper auxiliary unit 1 and the main body unit 2.

[0043] In another exemplary embodiment, such as Figure 4 , Figure 7 As shown, the top of the main body unit 2 is provided with a limiting block 27, and the limiting block 27 and the second limiting structure 21 are located on both sides of the slide groove 261 along the first direction. The bottom of the upper auxiliary unit 1 is provided with a pair of limiting buckles 14 opposite each other along the third direction. When the first limiting structure 11 and the second limiting structure 21 are inserted, the two limiting buckles 14 are engaged with the limiting block 27 to restrict the displacement of the upper auxiliary unit 1 and the main body unit 2 along the first direction.

[0044] Along the insertion direction of the upper auxiliary unit 1 and the main body unit 2, limiting structures are simultaneously set on both sides of the slide groove 261 of the main body movable frame 26 to improve the connection reliability of the upper auxiliary unit 1 and the main body unit 2.

[0045] Specifically, such as Figure 7 As shown, the limiting block 27 is provided with an extension block 271 located above the limiting buckle 14, which is used to limit the relative displacement of the upper auxiliary unit 1 and the main body unit 2 from the second direction.

[0046] In this embodiment, as Figure 4As shown, the limiting buckle 14 is provided with a guide slope 140. During the insertion process of the first limiting structure 11 and the second limiting structure 21, the guide slope 140 contacts the limiting block 27, driving the two limiting buckles 14 to swing away from each other. When the limiting buckle 14 passes the limiting block 27, the limiting buckle 14 engages with the limiting block 27, improving the convenience of the insertion process of the upper auxiliary unit 1 and the main body unit 2.

[0047] like Figure 5 , Figure 6 As shown, one end of the first elastic arm 12 is connected to the bottom of the housing of the auxiliary unit 1, and the other end of the first elastic arm 12 extends outward of the auxiliary unit 1 in the first direction and is provided with a drive end 121. The first elastic arm 12 is provided with a locking head 120 on the side facing the groove 22.

[0048] Specifically, the limiting buckle 14 has elastic deformation capability. When the upper auxiliary unit 1 and the main body unit 2 are assembled, the slider 131 is inserted into the groove 261 along the first direction. During the insertion process of the first limiting structure 11 and the second limiting structure 21, the insertion force is converted into the force driving the limiting buckle 14 to swing under the action of the guide inclined surface 140, so as to realize the locking of the limiting buckle 14 and the limiting block 27 during the insertion process. When the upper auxiliary unit 1 is disassembled, the external force pushes the limiting buckle 14 outward. Then, after the operator touches the driving end 121 with his finger and lifts the driving end 121, the first elastic arm 12 undergoes elastic deformation, the clamp head 120 is disconnected from the groove 22, and then the upper auxiliary unit 1 is moved in the opposite direction of the insertion direction to disassemble the upper auxiliary unit 1.

[0049] A drive end 121 is provided at the end of the first elastic arm 12, located outside the upper auxiliary unit 1, so that the operator can directly operate the drive end 121 manually to make the first elastic arm 12 elastically deform, which facilitates the movement of the chuck 120 during installation and disassembly, and improves the convenience of operation.

[0050] In one exemplary embodiment, such as Figure 9 , Figure 10 As shown, a limiting slot 24 is provided on the side wall of the main body unit 2 between the first slot 23 and the second slot 25, and a limiting plug 32 corresponding to the limiting slot 24 is provided on the side auxiliary unit 3. When the main body unit 2 and the side auxiliary unit 3 are detachably and fixedly connected, the limiting slot 24 and the limiting plug 32 are inserted, and the second hook 330 and the limiting plug 32 limit the side auxiliary unit 3 along the second direction from the inner and outer sides of the limiting slot 24.

[0051] When installing side auxiliary unit 3: When the second elastic arm 33 is pressed down with a tool, the first hook 31 is fastened into the first slot 23, and the limiting plug 32 is inserted into the limiting slot 24 and abuts against the lower end of the limiting slot 24. The second hook 330 is located in the second slot 25. Then the tool is withdrawn, and under the elastic restoring force, the second hook 330 engages with the second slot 25.

[0052] A limiting plug 32 and a limiting slot 24 are provided between the fastening structure of the first hook body 31 and the second hook body 330. This enables the first hook body 31 to be positioned and installed in the first slot 23, while forming a support point corresponding to the second elastic arm 33 near the second elastic arm 33, thus ensuring the stability of the elastic clamping force of the second elastic arm 33.

[0053] In one exemplary embodiment, such as Figure 11 As shown, the side auxiliary unit 3 is provided with an auxiliary insertion hole 30 corresponding to the second elastic arm 33 for inserting an auxiliary tool. The auxiliary tool applies pressure to the second elastic arm 33, thereby causing elastic deformation and separating the second hook 330 from the second slot 25. The second slot 25 penetrates the outer shell on one side of the body unit 2 corresponding to the second slot 25 along the first direction.

[0054] The second slot 25 is a one-way through slot, allowing the position of the second hook 330 within the second slot 25 to be observed from the side of the main body unit 2. Combined with the auxiliary insertion hole 30, it provides operating space for auxiliary tools, improving the convenience of disassembling and installing the side auxiliary unit 3.

[0055] Specifically, the auxiliary tool can be a flathead screwdriver.

[0056] like Figure 10 , Figure 11 As shown, the second elastic arm 33 includes a connecting arm 331 integrally formed with the housing of the side auxiliary unit 3. The two connecting arms 331 extend in opposite directions along a first direction. The ends of the connecting arms 331 are provided with extension arms 332 along a third direction. The ends of the extension arms 332 are located outside the housing of the side auxiliary unit 3 and are provided with a second hook 330. Integrating the second elastic arm 33 integrally with the housing of the side auxiliary unit 3 reduces mold costs.

[0057] In one exemplary embodiment, such as Figures 12-13As shown, in the upper auxiliary unit 1, both the upper auxiliary movable frame 13 and the main movable frame 26 are provided with multiple moving contact mounting structures arranged side by side along a third direction. Each moving contact mounting structure includes: two contact mounting slots 5 arranged along a second direction, with an isolation block 6 between the two contact mounting slots 5. Each moving contact mounting structure is equipped with a moving contact 4 and a spring 41. The moving contact 4 and the spring 41 are arranged along the second direction. The moving contact 4 is located between the isolation block 6 and the spring 41. The spring 41 is in a compressed state and contacts the moving contact 4, applying a spring force toward the isolation block 6 to the moving contact 4. The stationary contacts 7 on the upper auxiliary unit 1 and the side auxiliary unit 3 are arranged corresponding to the isolation block 6, and the stationary contacts 7 are directly opposite the moving contacts 4.

[0058] Two contact mounting slots 5 are provided along the second direction at the same mounting position of the moving contact 4, so that the orientation of the moving contact 4 can be selectively adjusted to realize the selection and change of the contact open and normally closed functions, and meet the various signal control needs of customers.

[0059] Specifically, when the moving contact 4 is installed in the upper contact mounting groove 5, the moving contact 4 faces downward and the stationary contact 7 faces upward; when the moving contact 4 is installed in the lower contact mounting groove 5, the moving contact 4 faces upward and the stationary contact 7 faces downward.

[0060] In one exemplary embodiment, such as Figures 14-15 As shown, the extended electromagnetic intermediate relay includes a moving contact 4 and a stationary contact 7 that is paired with the moving contact 4. Both the contact surface of the moving contact 4 and the contact surface of the stationary contact 7 are provided with multiple V-shaped grooves arranged side by side. The length direction of the V-groove on the moving contact 4 is perpendicular to the length direction of the V-groove on the stationary contact 7.

[0061] When the moving contact 4 contacts the stationary contact 7, the upper edges of the V-groove intersect at point contact. Under the same contact pressure, due to the very small contact area, the pressure per unit area (i.e., pressure intensity) is very large. If the contact is oxidized, it can effectively destroy impurities such as the oxide film on the metal surface, making it easier for current to pass through the few micro-contact points, thereby obtaining a smaller contact resistance. In addition, because the contact area of ​​the moving contact 4 and the stationary contact 7 is small, a large total pressure is not required to ensure a reliable connection. Therefore, the required contact pressure is small, which is beneficial for the miniaturization of the device and the lightweighting of the electromagnetic drive mechanism. The intermediate relay of this embodiment is suitable for small-capacity loads, such as below 10A.

[0062] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An extended electromagnetic intermediate relay, characterized in that: Includes a main body unit (2), on which an upper auxiliary unit (1) and / or a side auxiliary unit (3) are detachably mounted. The bottom of the upper auxiliary unit (1) is provided with a first limiting structure (11) and a first elastic arm (12). The first elastic arm (12) is provided with a locking head (120). The top of the main body unit (2) is provided with a second limiting structure (21) for inserting into the first limiting structure (11) along the first direction, thereby limiting the displacement of the main body unit (2) and the upper auxiliary unit (1) in two mutually perpendicular second directions and a third direction. The second direction and the third direction are both perpendicular to the first direction. The second direction is consistent with the movement direction of the main body movable frame (26) in the main body unit (2). The top of the main body unit (2) is also provided with a groove (22). The groove (22) is used to engage with the locking head (120) to limit the displacement of the main body unit (2) and the upper auxiliary unit (1) along the first direction. The upper part of the side wall of the main body unit (2) is provided with two first slots (23) arranged side by side at intervals along the first direction. The lower part of the side wall of the main body unit (2) is provided with two second slots (25) arranged side by side at intervals along the first direction. The side auxiliary unit (3) is provided with a first hook (31) for engaging with the first slot (23). The lower part of the side wall of the side auxiliary unit (3) is provided with a pair of second elastic arms (33). The end of the second elastic arm (33) is provided with a second hook (330) for engaging with the second slot (25). The engaging directions of the first hook (31) and the second hook (330) are opposite to each other along the second direction.

2. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: When the upper auxiliary unit (1) is detachably and fixedly connected to the main body unit (2), the slider (131) at the lower part of the upper auxiliary movable frame (13) in the upper auxiliary unit (1) is inserted into the slide groove (261) on the main body movable frame (26) along the first direction; The first limiting structure (11) includes a pair of first protrusions (110) arranged opposite each other along a third direction, and the second limiting structure (21) includes a pair of second protrusions (210) arranged opposite each other along a third direction. Each second protrusion (210) is provided with a slot (211). The two slots (211) are arranged opposite each other along the third direction. The opening direction of the slot (211) is one side of the first direction and one side of the third direction. When the first limiting structure (11) and the second limiting structure (21) are inserted, the first protrusion (110) is located in the slot (211) and abuts against the side wall of the slot (211).

3. The extended electromagnetic intermediate relay as described in claim 2, characterized in that: The top of the main body unit (2) is provided with a limiting block (27), and the limiting block (27) and the second limiting structure (21) are located on both sides of the slide groove (261) along the first direction; The bottom of the upper auxiliary unit (1) is provided with a pair of limiting buckles (14) in the third direction. When the first limiting structure (11) and the second limiting structure (21) are inserted, the two limiting buckles (14) are engaged with the limiting block (27) to restrict the displacement of the upper auxiliary unit (1) and the main body unit (2) in the first direction.

4. The extended electromagnetic intermediate relay as described in claim 3, characterized in that: The limiting buckle (14) is provided with a guide slope (140). During the insertion process of the first limiting structure (11) and the second limiting structure (21), the guide slope (140) contacts the limiting block (27), driving the two limiting buckles (14) to swing away from each other. When the limiting buckle (14) passes the limiting block (27), the limiting buckle (14) engages with the limiting block (27).

5. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: One end of the first elastic arm (12) is connected to the bottom of the housing of the upper auxiliary unit (1), and the other end of the first elastic arm (12) extends outward of the upper auxiliary unit (1) along the first direction and is provided with a driving end (121). The first elastic arm (12) is provided with the card head (120) on the side facing the groove (22).

6. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: The side wall of the main body unit (2) between the first slot (23) and the second slot (25) is provided with a limiting slot (24), and the side auxiliary unit (3) is provided with a limiting plug (32) corresponding to the limiting slot (24). When the main body unit (2) and the side auxiliary unit (3) are detachably and fixedly connected, the limiting slot (24) is inserted into the limiting plug (32), and the second hook (330) and the limiting plug (32) limit the side auxiliary unit (3) along the second direction from the inner and outer sides of the limiting slot (24).

7. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: The side auxiliary unit (3) is provided with an auxiliary insertion hole (30) corresponding to the second elastic arm (33) for inserting an auxiliary tool. The auxiliary tool is used to apply pressure to the second elastic arm (33) to cause elastic deformation, so that the second hook (330) separates from the second slot (25). The second slot (25) penetrates the outer shell on one side of the body unit (2) corresponding to the second slot (25) along the first direction.

8. The extended electromagnetic intermediate relay as described in claim 7, characterized in that: The second elastic arm (33) includes a connecting arm (331) integrally formed with the housing of the side auxiliary unit (3). The two connecting arms (331) extend away from each other along the first direction. The end of the connecting arm (331) is provided with an extension arm (332) along a third direction. The end of the extension arm (332) is located outside the housing of the side auxiliary unit (3) and is provided with the second hook (330).

9. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: In the upper auxiliary unit (1), both the upper auxiliary movable frame (13) and the main movable frame (26) are provided with multiple moving contact mounting structures arranged side by side along the third direction. Each moving contact mounting structure includes: Two contact mounting slots (5) are provided along the second direction, and an isolation block (6) is provided between the two contact mounting slots (5). Each moving contact mounting structure is equipped with a moving contact (4) and a spring (41). The moving contact (4) and the spring (41) are arranged along the second direction. The moving contact (4) is located between the isolation block (6) and the spring (41). The spring (41) is in a compressed state and contacts the moving contact (4), applying a spring force toward the isolation block (6) to the moving contact (4). The stationary contacts (7) on the upper auxiliary unit (1) and the side auxiliary unit (3) are arranged corresponding to the isolation block (6), and the stationary contacts (7) are directly opposite the moving contacts (4).

10. The extended electromagnetic intermediate relay as described in claim 1, characterized in that: It includes a moving contact (4) and a stationary contact (7) paired with the moving contact (4). The contact surfaces of the moving contact (4) and the stationary contact (7) are provided with multiple V-shaped grooves arranged side by side. The length direction of the V-groove on the moving contact (4) is perpendicular to the length direction of the V-groove on the stationary contact (7).

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