Relay armature preventing hot melt of push card and relay

Abstract

The application discloses a relay moving piece capable of preventing hot melting of a push card and a relay, comprising a first terminal, a second terminal, a moving piece, a push card and an electromagnetic unit. The moving piece has a first end and a second end, the first end is a fixed part and is connected with a terminal, the second end is a three-limb fork structure, a contact part is located in the middle, and two sides are a first action part and a second action part. The first action part is relatively rigid and serves as a main force receiving part, and the second action part has a relatively good heat insulation effect and serves as a standby force receiving part. The application prolongs a heat conduction path, sets a main and standby double action part, reduces the risk of hot melting of the push card, and improves the working reliability of the relay.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and specifically to a relay moving piece and a relay for preventing the push card from melting due to heat. Background Technology

[0002] Electromagnetic relays, as automatic switching components, are widely used in industrial control, communication equipment, home appliances, and automotive electronics. A relay typically consists of an electromagnetic unit and a contact system. The contact system includes terminals, a moving contact, a moving contact, and a stationary contact. The operating principle of a relay is as follows: when the electromagnetic unit is energized, it drives the moving contact to move, causing the moving contact to make or separate from the stationary contact, thereby controlling the on / off state of the circuit.

[0003] During relay operation, contact resistance is generated when the moving contact and stationary contact come into contact. Current flowing through the contact area generates Joule heat, significantly raising the contact temperature. Since the moving contact is made of metal, it has excellent thermal conductivity, and the heat from the contact area is conducted along the moving contact to the contact area between the push card and the moving contact. The push card, typically made of materials with limited heat resistance such as plastic, is prone to thermal deformation and melting at the contact area under prolonged heating or high current conditions. This can lead to a failure in the fit between the push card and the moving contact, consequently affecting the relay's operational reliability and lifespan.

[0004] To alleviate the aforementioned problems, some improvements have been proposed in the existing technology. For example, some solutions use thermosetting materials to manufacture the push card, leveraging the high heat resistance of thermosetting materials to improve the push card's high-temperature resistance; others incorporate insulating components between the moving piece and the push card to achieve heat insulation. However, simply relying on material improvements does not fundamentally solve the problem of heat conduction to the push card. Thermosetting materials are relatively expensive, and adding insulating components increases the number of parts and assembly complexity, making these solutions detrimental to product cost control.

[0005] Therefore, how to effectively reduce the heat conduction from the contact points to the push card, and still ensure the normal operation of the relay when the push card undergoes local heat melting, is an urgent problem to be solved in this field. Summary of the Invention

[0006] In order to effectively reduce the conduction of heat from the contact area to the push card, the present invention provides a relay moving piece and a relay to prevent the push card from melting due to heat.

[0007] The first technical solution adopted by the present invention is as follows: a relay moving piece for preventing the push card from melting by heat, comprising a first end and a second end; the first end serves as a fixing part connected to the wiring terminal; the second end has a forked structure, divided into at least two limbs, one of which serves as a contact part for mounting the moving contact, and the other limbs serve as a function part for contacting and cooperating with the push card.

[0008] Preferably, the second end has a three-limb forked structure, including the contact part in the middle and the first and second working parts on both sides; the first and second working parts respectively form contact with the push card; the rigidity of the first working part is greater than that of the second working part, and the first working part serves as the main force-bearing part; the heat insulation effect of the second working part is better than that of the first working part.

[0009] Preferably, a first dividing groove is provided between the contact portion and the first functional portion, and a second dividing groove is provided between the contact portion and the second functional portion; the first dividing groove and the second dividing groove have an asymmetrical structure.

[0010] Preferably, the width of the first dividing groove is smaller than the width of the second dividing groove, and the length of the first dividing groove is smaller than the length of the second dividing groove.

[0011] Preferably, the end of the second dividing groove is further provided with a flared portion, the width of which is greater than the width of the second dividing groove.

[0012] Preferably, the contact area between the first functional part and the push card is smaller than the contact area between the second functional part and the push card.

[0013] The second technical solution adopted in this invention is as follows: A relay includes a first terminal, a second terminal, a moving piece, a pusher, and an electromagnetic unit. The moving piece is connected to the first terminal and has a moving contact. The second terminal has a stationary contact that cooperates with the moving contact. The electromagnetic unit drives the moving piece to move through the pusher to achieve contact or separation between the moving contact and the stationary contact. The moving piece is a relay moving piece designed to prevent the pusher from melting. The pusher has a first abutting part and a second abutting part. The first abutting part abuts against the first actuating part, and the second abutting part abuts against the second actuating part.

[0014] Preferably, the first abutting part abuts against the surface of the first functional part; the second functional part is provided with a mating hole or a mating notch, the front end of the second abutting part is a reduced diameter structure, the reduced diameter structure is inserted into the mating hole or mating notch, and the stepped surface located behind the reduced diameter structure abuts against the surface of the second functional part, the abutting area of ​​the stepped surface is greater than the abutting area between the first abutting part and the first functional part.

[0015] Preferably, a flange structure is provided at the mating hole or mating notch, and the flange structure is used to improve the structural rigidity of the second functional part at the mating hole or mating notch.

[0016] The present invention has the following beneficial effects: 1. Extending the heat conduction path: By setting a forked structure at the second end of the moving piece, the contact part and the action part are separated. When the heat generated at the contact part is conducted along the moving piece to the action part, it must bypass the bottom of the slot. The conduction path is extended compared to a one-piece moving piece without forks. With the path extended, the heat has more time to dissipate into the surrounding air during conduction, and the temperature reaching the action part is correspondingly lower, thereby slowing down the hot-melting process of the push card.

[0017] 2. Balancing Force and Thermal Insulation Performance: The second end adopts a three-limbed forked structure, with the first and second working parts forming on either side of the contact area, and the two dividing grooves are asymmetrical. The first dividing groove has a smaller width and length, retains more material in that area, and has better rigidity. The first working part, as the main force-bearing part, bears the driving force of the push card for a long time. The second dividing groove has a larger width and length, and its end has a flared section wider than the groove width. More material is removed in that area, and heat must take a longer detour when conducting from the contact area to the second working part, resulting in better thermal insulation than the first working part. During normal operation, the first working part bears the main driving force transmission. When the relay has been used for a long time, if the push card part corresponding to the first working part melts due to heat, the fit between the first working part and the push card may loosen or fail. The second working part, due to its lower degree of heat, retains its corresponding push card part intact and can continue to bear the driving force transmission function. Thus, the two working parts cooperate to reduce the heat of the drive card while ensuring drive reliability, and provide a backup drive path after the main force path fails, thereby improving the long-term working reliability of the relay.

[0018] 3. Improved Local Stress Condition: The first actuating part has good rigidity, allowing sufficient contact pressure to be established per unit area with a small contact area, ensuring effective transmission of driving force to the moving piece. Simultaneously, the smaller contact area helps reduce heat conduction between the moving piece and the push card. The second actuating part has relatively poor rigidity. When used as a backup force-bearing part, its larger contact area disperses contact stress at the contact point, preventing additional deformation of the second actuating part or local crushing of the push card due to excessive local compressive stress, thus ensuring reliable operation of the backup driving path when activated. Furthermore, the larger contact area itself helps reduce heat flux density per unit area, synergizing with the superior heat insulation effect of the second actuating part, further reducing the risk of heat melting of the push card at the corresponding position of the second actuating part.

[0019] 4. Enhanced Backup Drive Reliability: The mating hole or notch on the second action part forms an insertion fit with the reduced-diameter structure at the front end of the second abutment part of the push card, with the stepped surface serving as the primary abutment surface in contact with the surface of the second action part. When the fit at the first action part fails and the second action part is used as a backup force-bearing part, the reduced-diameter structure acts as a radial limiter on the mating hole or notch, preventing the push card from disengaging from the second action part during drive; the stepped surface provides a stable axial abutment relationship. The flanged structure at the mating hole or notch enhances the local rigidity at that location, avoiding a decrease in strength due to material removal. These structures collectively ensure that the backup function can be reliably activated when needed.

[0020] 5. Compact Structure: The above-mentioned effects are achieved through the optimization of the moving plate fork structure and the shape and size of the dividing slot. The push card only needs to be equipped with a corresponding abutment structure, without the need to add independent heat insulation or heat dissipation components. Compared with the existing technology that adds insulating components, the number of parts is reduced and the assembly process is shorter, which is conducive to the miniaturization of relays and cost control. Attached Figure Description

[0021] Figure 1 This is an overall assembly diagram of an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the assembly of the push card and the moving piece in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the moving piece in an embodiment of the present invention.

[0024] 1-Moving piece, 1.1-Fixing part, 1.2-Contact part, 1.3-Actuating part, 1.3a-First actuating part, 1.3b-Second actuating part, 1.4-First dividing groove, 1.5-Second dividing groove, 1.6-Flanged part; 2-Terminal block, 2a-First terminal, 2b-Second terminal; 3-Moving contact; 4-static contact; 5-Push card, 5.1-First abutment part, 5.2-Second abutment part; 6-Electromagnetic unit; 7-Base. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0026] like Figures 1 to 3 As shown, the present invention provides a relay moving piece for preventing the push card from overheating and a relay using the moving piece.

[0027] like Figure 3As shown, the moving piece 1 is made of conductive metal material and has a first end and a second end. The first end serves as a fixing part 1.1, used for fixed connection with the terminal 2. The fixing part 1.1 can achieve electrical and mechanical connection with the terminal 2 through welding, riveting, or bolting. The second end has a forked structure, which divides the second end into at least two limbs. One limb serves as a contact part 1.2, used to install the moving contact 3; the remaining limbs serve as the action part 1.3, used to form a contact engagement with the push card 5. The contact part 1.2 and the action part 1.3 are separated by a slot, which extends the path of heat conduction from the contact part to the action part 1.3 compared to the unforked, one-piece structure. With the extended path, heat has more time to dissipate into the surrounding air during conduction, and the temperature reaching the action part 1.3 is correspondingly lower, thereby slowing down the heat-melting process of the push card 5.

[0028] A bend is provided between the second end and the first end. The moving piece 1 obtains the required elastic deformation capacity through the bend, so as to realize the contact or separation of the moving contact 3 and the stationary contact 4 under the drive of the push card 5.

[0029] like Figure 3 As shown, the second end has a three-limbed forked structure, including a contact portion 1.2 located in the middle and a first actuating portion 1.3a and a second actuating portion 1.3b located on both sides of the contact portion 1.2. The contact portion 1.2 is used to install the moving contact 3, and the first actuating portion 1.3a and the second actuating portion 1.3b are used to form contact engagement with the push card 5. A first dividing groove 1.4 is provided between the contact portion 1.2 and the first actuating portion 1.3a, and a second dividing groove 1.5 is provided between the contact portion 1.2 and the second actuating portion 1.3b. The first dividing groove 1.4 and the second dividing groove 1.5 have an asymmetrical structure. Specifically, the width of the first dividing groove 1.4 is smaller than the width of the second dividing groove 1.5, and the length of the first dividing groove 1.4 is smaller than the length of the second dividing groove 1.5. Because the width and length of the first dividing groove 1.4 are relatively small, more material is retained in the area where the first functional part 1.3a is located, resulting in better rigidity. The rigidity of the first functional part 1.3a is greater than that of the second functional part 1.3b, making the first functional part 1.3a the main force-bearing part. The width and length of the second dividing groove 1.5 are relatively large, resulting in more material removal in the area where the second functional part 1.3b is located. Heat must travel a longer path when conducting from the contact part 1.2 to the second functional part 1.3b, therefore the heat insulation effect of the second functional part 1.3b is better than that of the first functional part 1.3a. During normal operation, the first functional part 1.3a bears the main driving force transmission. After prolonged use, if the push card 5 corresponding to the first functional part 1.3a melts due to heat, causing loosening or failure of the fit between the first functional part 1.3a and the push card 5, the second functional part 1.3b, due to lower heat exposure, retains its corresponding push card 5 intact and can continue to perform the driving force transmission function.

[0030] like Figure 3 As shown, the end of the second dividing groove 1.5 is also provided with a flared portion 1.6, the width of which is greater than the groove width of the second dividing groove 1.5. The flared portion 1.6 causes heat to bypass the edge of the flared portion 1.6 when it is conducted from the contact portion 1.2 to the second working portion 1.3b. Compared with the straight groove bottom structure without the flared portion 1.6, the conduction path is further extended, and the temperature at the second working portion 1.3b is further reduced.

[0031] like Figure 2 As shown, the contact area between the first actuating part 1.3a and the push card 5 is smaller than the contact area between the second actuating part 1.3b and the push card 5. The first actuating part 1.3a has better rigidity, and with a smaller contact area, sufficient contact pressure can be established per unit area to ensure effective transmission of driving force to the moving piece 1. At the same time, the smaller contact area helps to reduce heat conduction between the moving piece 1 and the push card 5. The second actuating part 1.3b has relatively poor rigidity. When used as a backup force-bearing part, the larger contact area can disperse the contact stress at the contact point, avoiding additional deformation of the second actuating part 1.3b or local crushing of the push card 5 due to excessive local compressive stress, thereby ensuring reliable operation of the backup driving path when activated. The larger contact area also helps to reduce the heat flux density per unit area, which, together with the better heat insulation effect of the second actuating part 1.3b, further reduces the risk of heat melting of the push card 5 at the corresponding position of the second actuating part 1.3b.

[0032] like Figure 1 and Figure 2 As shown, the relay includes a first terminal 2a, a second terminal 2b, a moving piece 1, a pusher 5, and an electromagnetic unit 6. The moving piece 1 is connected to the first terminal 2a and has a moving contact 3. The second terminal 2b has a stationary contact 4 that cooperates with the moving contact 3. The electromagnetic unit 6 drives the moving piece 1 to move via the pusher 5, thereby achieving contact or separation between the moving contact 3 and the stationary contact 4. The moving piece 1 adopts the aforementioned relay moving piece designed to prevent the pusher 5 from melting due to heat.

[0033] The electromagnetic unit 6 includes components such as a coil frame, an iron core, a coil, and an armature. When the coil is energized, the iron core generates an electromagnetic attraction that drives the armature to move. The armature transmits the motion to the moving piece 1 by pushing the clip 5.

[0034] like Figure 1 and Figure 2 As shown, the push card 5 is made of plastic material and has a first abutment part 5.1 and a second abutment part 5.2. The first abutment part 5.1 abuts against the first actuating part 1.3a, and the second abutment part 5.2 abuts against the second actuating part 1.3b.

[0035] like Figure 2As shown, the first abutting part 5.1 abuts against the surface of the first abutting part 1.3a. The abutting method between the first abutting part 5.1 and the first abutting part 1.3a is surface contact, with a small contact area, which is beneficial to establish sufficient contact pressure on a small contact area and ensure the effective transmission of driving force.

[0036] The second actuating part 1.3b is provided with a mating hole or a mating notch. The front end of the second abutting part 5.2 of the push card 5 is a reduced-diameter structure, which is inserted into the mating hole or mating notch. The stepped surface located behind the reduced-diameter structure abuts against the surface of the second actuating part 1.3b. The abutting area of ​​the stepped surface is larger than the abutting area between the first abutting part 5.1 and the first actuating part 1.3a. When the fit at the first actuating part 1.3a fails and the second actuating part 1.3b is put into use as a backup force-bearing part, the reduced-diameter structure acts as a radial limiter on the mating hole or mating notch, preventing the push card 5 from disengaging from the second actuating part 1.3b during the driving process; the stepped surface provides a stable axial abutting relationship.

[0037] A flange structure is provided at the mating hole or mating notch. The flange structure is formed by folding the edge of the mating hole or mating notch, which is used to improve the structural rigidity of the second actuating part 1.3b at the mating hole or mating notch and avoid the decrease in strength due to material removal. The flange structure can be formed by stamping process and integrally processed with the moving piece 1 without the need for additional parts.

[0038] In the actual assembly process of the relay, firstly, the fixing part 1.1 of the moving contact 1 is fixedly connected to the first terminal 2a, the moving contact 3 is installed on the contact part 1.2, and the stationary contact 4 is installed on the second terminal 2b. Then, the first abutting part 5.1 of the push card 5 abuts against the first actuating part 1.3a, and the reduced diameter structure at the front end of the second abutting part 5.2 is inserted into the mating hole or mating notch on the second actuating part 1.3b, so that the stepped surface abuts against the surface of the second actuating part 1.3b. Finally, the electromagnetic unit 6 is linked to the push card 5 to complete the assembly of the relay.

[0039] When the relay is working, the electromagnetic unit 6 is energized to generate driving force, which drives the moving piece 1 to move by pushing the card 5. Because the second end of the moving piece 1 has a forked structure, the contact part 1.2 and the actuating part 1.3 of the moving piece 1 are separated by a slot. The heat generated at the contact point is extended along the path of conduction from the moving piece 1 to the actuating part 1.3, and the temperature reaching the actuating part 1.3 is correspondingly lower, thus slowing down the heat-melting process of the pushing card 5. During normal operation, the first actuating part 1.3a, as the main force-bearing part, bears the main driving force transmission. After long-term use of the relay, if the pushing card 5 part corresponding to the first actuating part 1.3a melts due to heat, the pushing card 5 part corresponding to the second actuating part 1.3b, due to its lower degree of heat, remains intact and can continue to bear the driving force transmission function, thereby ensuring the long-term reliability of the relay.

[0040] Obviously, the above embodiments of the present invention are merely illustrative examples to illustrate the invention and are not intended to limit the implementation of the invention. Other obvious variations or modifications derived from the essential spirit of the invention still fall within the protection scope of the invention.

Claims

1. A relay moving piece for preventing the push card from melting due to heat, comprising a first end and a second end, characterized in that, The first end serves as a fixing part (1.1) connected to the wiring terminal (2). The second end has a forked structure, divided into at least two limbs, one of which serves as the contact part (1.2) for mounting the moving contact (3), and the other limbs serve as the action part (1.3) for contacting and cooperating with the push card (5).

2. The relay moving piece for preventing the push card from overheating and melting according to claim 1, characterized in that, The second end is a three-limbed forked structure, including the contact part (1.2) located in the middle and the first working part (1.3a) and the second working part (1.3b) on both sides; the first working part (1.3a) and the second working part (1.3b) respectively form contact with the push card (5); The rigidity of the first working part (1.3a) is greater than that of the second working part (1.3b), and the first working part (1.3a) serves as the main force-bearing part; the heat insulation effect of the second working part (1.3b) is better than that of the first working part (1.3a).

3. The relay moving piece for preventing the push card from overheating and melting according to claim 2, characterized in that, A first dividing groove (1.4) is provided between the contact part (1.2) and the first functional part (1.3a), and a second dividing groove (1.5) is provided between the contact part (1.2) and the second functional part (1.3b); the first dividing groove (1.4) and the second dividing groove (1.5) have an asymmetrical structure.

4. The relay moving piece for preventing the push card from overheating and melting according to claim 3, characterized in that, The width of the first dividing groove (1.4) is smaller than the width of the second dividing groove (1.5), and the length of the first dividing groove (1.4) is smaller than the length of the second dividing groove (1.5).

5. The relay moving piece for preventing the push card from overheating and melting according to claim 4, characterized in that, The end of the second dividing groove (1.5) is also provided with a flared part (1.6), the width of which is greater than the groove width of the second dividing groove (1.5).

6. The relay moving piece for preventing the push card from overheating and melting according to any one of claims 2 to 5, characterized in that, The contact area between the first actuating part (1.3a) and the push card (5) is smaller than the contact area between the second actuating part (1.3b) and the push card (5).

7. A relay comprising a first terminal (2a), a second terminal (2b), a movable piece (1), a pusher (5), and an electromagnetic unit (6), wherein the movable piece (1) is connected to the first terminal (2a), the movable piece (1) has a movable contact (3), and the second terminal (2b) has a stationary contact (4) that cooperates with the movable contact (3), and the electromagnetic unit (6) drives the movable piece (1) to move through the pusher (5) to achieve contact or separation between the movable contact (3) and the stationary contact, characterized in that, The moving piece (1) is a relay moving piece as described in any one of claims 2 to 6 to prevent the push card from melting; The push card (5) is provided with a first abutting part (5.1) and a second abutting part (5.2). The first abutting part (5.1) abuts against the first actuating part (1.3a), and the second abutting part (5.2) abuts against the second actuating part (1.3b).

8. The relay according to claim 7, characterized in that, The first abutting part (5.1) abuts against the surface of the first functional part (1.3a); the second functional part (1.3b) is provided with a mating hole or a mating notch, the front end of the second abutting part (5.2) is a reduced diameter structure, the reduced diameter structure is inserted into the mating hole or mating notch, the stepped surface located behind the reduced diameter structure abuts against the surface of the second functional part (1.3b), and the abutting area of ​​the stepped surface is greater than the abutting area between the first abutting part (5.1) and the first functional part (1.3a).

9. The relay according to claim 8, characterized in that, A flange structure is provided at the mating hole or mating notch, and the flange structure is used to improve the structural rigidity of the second working part (1.3b) at the mating hole or mating notch.

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