Anti-falling small-size relay

Abstract

The utility model discloses an anti-falling small-size relay. Comprising a framework, a coil arranged in the framework, an iron stand which is arranged at the side edge of the framework and is vertically arranged, an elastic sheet riveted on the iron stand, an armature which is riveted on the elastic sheet and is positioned between the elastic sheet and the framework, a movable contact arranged at the end part of the elastic sheet, and a static contact which is arranged on the framework and is positioned right below the movable contact, the anti-falling small-size relay is further provided with a shell wrapping the framework, the armature, the iron stand, the movable contact and the static contact. The limiting column which is arranged on the top of the iron stand and is arranged on the iron stand is matched with the armature, and the armature is riveted with the elastic piece, so that the left-right deviation of the elastic piece relative to the framework is limited, and the influence of the position change of the elastic piece on the moving armature in the falling process is effectively resisted. The avoiding groove for placing the stop part of the elastic sheet on the framework ensures that the groove position is not ablated by an electric arc when the electric arc is ablated, so that the effective insulation distance between the movable contact and the static contact is met.

Description

Technical Field

[0001] This utility model relates to a drop-resistant small-volume relay, and more particularly to a drop-resistant small-volume relay with a compact structure, miniaturization, low cost, and excellent drop resistance performance. Background Technology

[0002] With the development of new energy technologies, the popularity of new energy vehicles has increased significantly, and portable charging guns, as standard equipment in electric vehicles, are becoming increasingly widely used. However, when charging at home, the charging gun head is often inevitably subjected to collisions and drops, leading to relay damage and malfunction. In current applications, adding sponge to the relay for cushioning is common, but this can worsen internal heat dissipation, causing abnormal internal temperatures and reducing relay lifespan. Furthermore, this method does not completely and effectively protect the relay from drop damage. Therefore, improving the relay's drop resistance is crucial. Simultaneously, miniaturization is a development trend for portable charging guns, placing demands on the size of the relay. Smaller sizes present greater challenges in designing the relay's current-carrying capacity, insulation distance, and controlling costs.

[0003] Existing relay products are bulky, requiring larger PCB boards on the client side to accommodate them. Adding internal foam for shock resistance leads to poor internal heat dissipation, shortening the relay's lifespan. To increase internal insulation distance, existing products use insulating boards or plastic filling between high and low voltage circuits, a complex and costly process.

[0004] Relays typically use the housing to provide omnidirectional limiting for the armature. However, because the housing and armature are not directly assembled, manufacturing and assembly tolerances make it difficult to guarantee the clearance between them. When the spring strength is weak, it cannot effectively resist the impact of armature position changes on the moving spring during a drop. Relay products often use a structure with protruding iron frames on both sides for limiting. If this structure is used, the armature will be irregularly shaped and difficult to form. In terms of parameters, it will result in more magnetic leakage, leading to a larger magnetic pull and making it difficult to guarantee drop resistance. Given these problems, there is an urgent need for a relay that overcomes these issues. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a drop-resistant, small-volume relay with the characteristics of compact structure, miniaturization, low cost, and excellent drop resistance.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a drop-resistant small-volume relay, the innovation of which is that: the drop-resistant small-volume relay includes a frame, a coil disposed in the frame, an iron frame disposed on the side of the frame and vertically disposed, a spring piece riveted to the iron frame, an armature riveted to the spring piece and located between the spring piece and the frame, a moving contact disposed at the end of the spring piece, and a stationary contact disposed on the frame and located directly below the moving contact; the drop-resistant small-volume relay is further provided with a shell covering the frame, armature, iron frame, moving contact and stationary contact;

[0007] The iron frame is set on the side of the skeleton away from the stationary contact point. A limiting post is provided on the iron frame at the top of the iron frame. A limiting opening is provided on the armature for the limiting post to pass through. The limiting opening is located at the pivot point between the armature and the iron frame.

[0008] Preferably, the skeleton includes a skeleton base, a skeleton top disposed above the skeleton base, an iron core disposed on the skeleton base and passing through the skeleton top, an iron frame inserted into a preset mounting slot on the skeleton base and the skeleton top, a spring piece disposed above the skeleton top, an armature located between the skeleton top and the spring piece, and a coil sleeved on the iron core;

[0009] The frame base and the top of the frame are respectively provided with a number of creepage grooves for preventing creepage. The creepage grooves are non-through grooves. The limiting post and the limiting port are clearance fit.

[0010] Preferably, the outer casing is provided with a first rib that abuts against the top surface of the spring when the stationary contact and the moving contact are in a separated state. The contact point between the first rib and the spring is a surface contact, and the contact point between the first rib and the spring is closer to the moving contact.

[0011] Preferably, the outer casing is provided with a second rib that abuts against the top surface of the spring when the stationary contact and the moving contact are in a separated state. The contact point between the second rib and the spring is a surface contact, and the contact point between the second rib and the spring is the riveting point between the armature and the spring.

[0012] Preferably, the spring sheet has at least two rivet points that are riveted to the armature, and the rivet points and adjacent rivet points are arranged side by side.

[0013] Preferably, the riveting point position on the spring sheet is such that the ratio of the left side to the right side of the spring sheet along its length is 2-4:8-6, and the left side of the spring sheet is closer to the moving contact.

[0014] Preferably, the outer casing is provided with a third rib that abuts against the spring and the armature when the stationary contact and the moving contact are in the open state. The third rib includes a first part that abuts against the spring and a second part that abuts against the armature. The contact point between the third rib and the spring is located on the side of the spring away from the moving contact.

[0015] Preferably, the spring is 7-shaped, including a horizontal portion mounted on the frame and riveted to the armature, and a vertical portion riveted to the iron frame. The moving contact is located at the end of the horizontal portion away from the vertical portion. The vertical portion is in direct contact with the iron frame, and the iron frame is provided with a riveting protrusion riveted to the vertical portion. A riveting hole is provided at a corresponding position on the vertical portion for the riveting protrusion to be inserted. The riveting protrusion is either interference-fitted or transition-fitted in the riveting hole.

[0016] Preferably, the frame is provided with stop ribs symmetrically arranged on both sides of the spring piece, and the stop ribs are symmetrically arranged with respect to the limiting post.

[0017] Preferably, the spring sheet has a vertically arranged stop portion at one end near the moving contact, the stop portion is detachably connected to the spring sheet, and the frame is provided with a clearance groove for the stop portion to be inserted.

[0018] After the stop part is inserted into the clearance groove, a gap is left between the stop part and the clearance groove.

[0019] The advantages of this invention are as follows: Wire usage constitutes a large portion of the relay cost, and to reduce costs, the amount of wire used needs to be reduced, resulting in lower coil attraction. The reaction force of the load component also needs to be minimized. Reducing the armature reaction force can only be achieved through a smaller width or thickness, leading to weaker armature strength and compromised drop resistance. Therefore, to ensure the relay's drop resistance, the spring contacts must be properly positioned to minimize movement and reduce pulling on the armature, which could cause deformation and affect relay operation.

[0020] The first, second, and third ribs on the outer shell are used in conjunction with the spring to prevent deformation of the armature and spring in the vertical direction. The stop ribs symmetrically arranged on both sides of the spring on the frame and the limiting post located on the top of the iron frame away from the stationary contact point, due to the riveting of the armature and spring, restrict the forward, backward, left, and right displacement of the spring and the frame, thus effectively resisting the influence of the spring position change on the moving armature during the fall.

[0021] The relief groove on the frame of this utility model is designed to allow the stop portion to be inserted, ensuring that the groove position is not burned by the electric arc during the arc erosion, thereby satisfying the effective insulation distance between the moving and stationary contacts. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a perspective view of a drop-resistant, small-volume relay of this utility model, omitting the outer casing.

[0024] Figure 2 This is a schematic diagram of the structure of a drop-resistant small-volume relay of this utility model, omitting the outer casing.

[0025] Figure 3 This is a partial structural schematic diagram of a drop-resistant, small-volume relay according to this utility model.

[0026] Figure 4 This is a schematic diagram of the armature and spring in a drop-resistant small-volume relay according to this utility model.

[0027] Figure 5 This is a schematic diagram of the frame and spring in a drop-resistant small-volume relay according to this utility model.

[0028] Figure 6 This is a schematic diagram of the skeleton and iron frame in a drop-resistant small-volume relay of this utility model.

[0029] Figure 7 This is a schematic diagram of the skeleton structure in a drop-resistant small-volume relay according to this utility model.

[0030] In the diagram: 1-Skeleton, 11-Skeleton base, 12-Skeleton top, 13-Core, 14-Iron frame, 15-Riveting protrusion, 16-Stop rib, 17-Allowing groove, 18-Crawling groove, 2-Coil, 3-Spring, 31-Limiting port, 32-Horizontal part, 33-Vertical part, 34-Riveting hole, 35-Stop part, 4-Armature, 41-Riveting point, 5-Moving contact, 6-Static contact, 7-Outer shell, 71-First rib, 72-Second rib, 731-First part, 732-Second part, 8-Limiting post. Detailed Implementation

[0031] This utility model discloses a drop-resistant small-volume relay, comprising a frame 1, a coil 2 disposed within the frame 1, a vertically arranged iron frame 14 disposed on the side of the frame, a spring piece 3 riveted to the iron frame 14, an armature 4 riveted to the spring piece 3 and located between the spring piece 3 and the frame 1, a moving contact 5 disposed at the end of the spring piece 3, and a stationary contact 6 disposed on the frame 1 and directly below the moving contact 5. The drop-resistant small-volume relay also includes a housing 7 covering the frame 1, armature 4, iron frame 14, moving contact 5, and stationary contact 61. The iron frame 14 is disposed on the side of the frame away from the stationary contact, and a limiting post 8 is disposed on the top of the iron frame 14. The armature 4 has a limiting opening 31 for the limiting post 8 to pass through, and the limiting opening 31 is located at the pivot point between the armature and the iron frame. By setting a limiting post 8 at the end of the frame 1 on the side away from the stationary contact 6, the front-back and left-right displacement of the spring 3 and the frame 1 is restricted due to the riveting of the armature 4 and the spring 3, thereby effectively resisting the influence of the position change of the spring 3 on the moving armature 4 during the fall.

[0032] The aforementioned frame 1 includes a frame base 11, a frame top 12 disposed above the frame base 11, and an iron core 13 disposed on the frame base 11 and passing through the frame top 12. To improve the assembly stability between parts and better meet drop resistance requirements, an iron frame 14 is inserted into a pre-set mounting slot on the frame base 11 and the frame top 12. A spring piece 3 is disposed above the top surface of the frame 1, an armature 4 is located between the frame top and the spring piece 3, and a coil 2 is sleeved on the iron core 13. To avoid motion interference, the limiting post 8 and the limiting port 31 are clearance-fitted.

[0033] The aforementioned frame base 11 and frame top 12 are each provided with a plurality of creepage grooves 18 for preventing creepage. The creepage grooves 18 are non-through grooves running vertically. The purpose of setting up creepage grooves is to meet the requirements of product miniaturization and enhanced insulation, so creepage grooves need to be designed to increase the insulation distance between conductive parts and meet safety requirements.

[0034] To restrict the degrees of freedom of the spring 3, specifically: the outer shell 7 is provided with a first rib 71 that abuts against the top surface of the spring 3 when the stationary contact 6 and the moving contact 5 are separated. The contact point between the first rib 71 and the spring 3 is a surface contact, and the contact point between the first rib 71 and the spring 3 is closer to the moving contact 5. The outer shell 7 is provided with a second rib 72 that abuts against the top surface of the spring when the stationary contact 6 and the moving contact 5 are separated. The contact point between the second rib 72 and the spring 3 is a surface contact, and the contact point between the second rib 72 and the spring 3 is the riveting point 41 between the armature 4 and the spring 3. The spring 3 is provided with at least two riveting points 41 riveted to the armature 4, and the riveting points and adjacent riveting points are arranged side by side. The outer casing 7 is provided with a third rib that abuts against the spring 3 and the armature 4 when the stationary contact 6 and the moving contact 5 are in the open state. The third rib includes a first part 731 that abuts against the spring 3 and a second part 732 that abuts against the armature 4. The contact point between the third rib and the spring 3 is located on the side of the spring 3 away from the moving contact 5. By using the first rib 71, the second rib 72 and the third rib provided on the outer casing 7 in conjunction with the spring 3, deformation of the armature 4 and the spring 3 in the vertical direction is prevented, thereby effectively resisting the influence of the spring position change on the moving armature during the drop.

[0035] The riveting positions on the aforementioned spring 3 result in a length-to-length ratio of 2-4:8-6 for the left and right sides of the spring 3, with the left side closer to the moving contact 5. Different riveting positions will result in different contact pressures on the spring 3, leading to varying deformations. Tests on samples from different riveting positions demonstrate that the aforementioned riveting position ratio is beneficial for maintaining parameter stability during drop testing.

[0036] To prevent the armature 4 from moving relative to the frame 1 during a drop, the spring 3 is shaped like a figure 7, including a horizontal part 32 that is mounted on the frame 1 and riveted to the armature 4, and a vertical part 33 that is riveted to the iron frame 14. The moving contact 5 is located at the end of the horizontal part 32 that is away from the vertical part 33. The vertical part 33 is in direct contact with the iron frame 14. The iron frame 14 is provided with a riveting protrusion 15 that is riveted to the vertical part 33. A riveting hole 34 is provided at a corresponding position on the vertical part 33 for the riveting protrusion 15 to be inserted. The riveting protrusion 15 is either interference-fitted or transition-fitted in the riveting hole 34.

[0037] To effectively resist the impact of the positional change of the spring 3 on the moving armature 4 during a drop, the frame 1 is provided with symmetrically arranged stop ribs 16 on both sides of the spring, and the stop ribs 16 are symmetrically arranged with respect to the limit post 8. To improve the insulation performance of the relay and ensure that the slot position is not burned by the arc during arcing, thereby meeting the effective insulation distance between the moving and stationary contacts 6, a vertically arranged stop part 35 is provided on the spring 3 near the moving contact 5, and the frame 1 is provided with a clearance groove 17 for the stop part 35 to be inserted. After the stop part 35 is inserted into the clearance groove 17, a gap is left between the stop part 35 and the clearance groove 17. The stop part 35 is a detachable metal part, the purpose of which is to prevent the contact spring and plastic from sticking together during product use. After 50,000 cycles, the relay meets the withstand voltage requirements of safety regulations. During the relay's electrical life, the interruption of the electric arc will cause the plastic parts around the contacts to burn and carbonize, resulting in the plastic losing its insulating function and causing the withstand voltage of the relay's moving and stationary ends to break down, which does not meet the safety requirements. Therefore, clearance grooves 17 are designed on both sides of the contact end of the frame 1 to ensure that the clearance grooves 17 are clean when the arc burns, thereby meeting the effective insulation distance between the moving contact 5 and the stationary contact 6.

[0038] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this application should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed utility model subject matter.

Claims

1. A drop-resistant, small-volume relay, characterized in that: The drop-resistant small-volume relay includes a frame, a coil disposed within the frame, a vertically arranged iron frame disposed on the side of the frame, a spring piece riveted to the iron frame, an armature riveted to the spring piece and located between the spring piece and the frame, a moving contact disposed at the end of the spring piece, and a stationary contact disposed on the frame and located directly below the moving contact. The drop-resistant small-volume relay also includes a housing covering the frame, armature, iron frame, moving contact, and stationary contact. The iron frame is set on the side of the skeleton away from the stationary contact point. A limiting post is provided on the iron frame at the top of the iron frame. A limiting opening is provided on the armature for the limiting post to pass through. The limiting opening is located at the pivot point between the armature and the iron frame.

2. The drop-resistant small-volume relay as described in claim 1, characterized in that: The skeleton includes a skeleton base, a skeleton top disposed above the skeleton base, and an iron core disposed on the skeleton base and passing through the skeleton top. An iron frame is inserted into a preset mounting slot on the skeleton base and the skeleton top. The spring is disposed above the skeleton top. The armature is located between the skeleton top and the spring. The coil is sleeved on the iron core. The frame base and the top of the frame are respectively provided with a number of creepage grooves for preventing creepage. The creepage grooves are non-through grooves. The limiting post and the limiting port are clearance fit.

3. The drop-resistant small-volume relay as described in claim 1, characterized in that: The outer casing is provided with a first rib that abuts against the top surface of the spring when the stationary contact and the moving contact are in a separated state. The contact point between the first rib and the spring is a surface contact, and the contact point between the first rib and the spring is closer to the moving contact.

4. The drop-resistant small-volume relay as described in claim 1, characterized in that: The outer casing is provided with a second rib that abuts against the top surface of the spring when the stationary contact and the moving contact are in a separated state. The contact point between the second rib and the spring is a surface contact, and the contact point between the second rib and the spring is the riveting point between the armature and the spring.

5. A drop-resistant, small-volume relay as described in claim 4, characterized in that: The spring sheet has at least two rivet points that are riveted to the armature, and the rivet points and adjacent rivet points are arranged side by side.

6. A drop-resistant, small-volume relay as described in claim 5, characterized in that: The riveting point on the spring sheet is positioned such that the ratio of the left side to the right side of the spring sheet along its length is 2-4:8-6, with the left side of the spring sheet being closer to the moving contact.

7. A drop-resistant, small-volume relay as described in claim 1, characterized in that: The outer casing is provided with a third rib that abuts against the spring and the armature when the stationary contact and the moving contact are in the open state. The third rib includes a first part that abuts against the spring and a second part that abuts against the armature. The contact point between the third rib and the spring is located on the side of the spring away from the moving contact.

8. A drop-resistant, small-volume relay as described in claim 1, characterized in that: The spring is 7-shaped, including a horizontal part that is mounted on the frame and riveted to the armature and a vertical part that is riveted to the iron frame. The moving contact is located at the end of the horizontal part away from the vertical part. The vertical part is in direct contact with the iron frame, and the iron frame is provided with a riveting protrusion that is riveted to the vertical part. A riveting hole is provided at a corresponding position on the vertical part for the riveting protrusion to be inserted. The riveting protrusion is either interference-fitted or transition-fitted in the riveting hole.

9. A drop-resistant, small-volume relay as described in claim 1, characterized in that: The frame is provided with stop ribs symmetrically arranged on both sides of the spring piece, and the stop ribs are symmetrically arranged with respect to the limiting post.

10. A drop-resistant, small-volume relay as described in claim 1, characterized in that: The spring sheet has a vertically arranged stop part near the moving contact, the stop part is detachably connected to the spring sheet, and the frame is provided with a clearance groove for the stop part to be inserted. After the stop part is inserted into the clearance groove, a gap is left between the stop part and the clearance groove.

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