Large-impulse piston type breaking structure for circuit protection device

Abstract

The utility model relates to a circuit protection device for equipment in the fields of power distribution, power utilization, energy storage and the like, in particular to a large-impulse piston type breaking structure for a circuit protection device, which comprises a plunger section and a support leg section, the plunger section is provided with a large-density balancing weight, and the impact end face of the supporting leg section is provided with an impact structure in a spliced mode, wherein the strength and the hardness of the impact structure are both larger than those of the supporting leg section. According to the circuit protection device, the mass of the breaking structure is improved by adding the balancing weight, so that the kinetic energy and the impact force of the breaking structure are improved, and when the mass of the breaking structure is improved and the kinetic energy can meet the requirement, the size of the breaking structure can be correspondingly reduced, so that the overall size of the circuit protection device can be correspondingly reduced. By splicing the high-strength and high-hardness impact structures on the supporting leg sections, the impact resistance can be improved, and the situation that the breaking structure is damaged and seriously deforms during impact, and the cutting performance is affected is avoided.

Description

Technical Field

[0001] The present invention relates to a circuit protection device for equipment in the fields of power distribution, power consumption, energy storage, etc., and specifically refers to a large-impulse piston-type breaking structure for a circuit protection device. Background Art

[0002] At present, the excitation fuse uses the gas generated after the pyrotechnic gas generator is triggered to push the plastic breaking structure to displace and hit the conductor, so that the conductor is broken to achieve the disconnection of the current circuit. Generally, the breaking structure of the excitation fuse, that is, the piston, is an integrally formed plastic material structure with insulating properties. When the breaking structure is driven by the high-pressure gas released by the gas generator, the breaking structure is displaced to interrupt the conductive part of the excitation fuse, thereby disconnecting the protection circuit and achieving protection. However, since the density, hardness and strength of the plastic material of the breaking structure are relatively low, when it is impacted and the conductive bar is interrupted, the kinetic energy is relatively small due to the relatively low density and relatively small mass, and the impact kinetic energy brought to the conductive part is relatively small. Moreover, when the plastic material impacts the conductive part, due to the low strength and hardness, after the impact contact with the conductive part, the breaking structure may produce a large deformation under the impact, and the deformation will offset part of the force acting on the conductive part, reduce the impact force, and then lead to the limited ability to break the conductive part, affecting the reliability of the conductive part disconnection. Summary of the invention

[0003] The purpose of the present invention is to provide a large-impulse piston-type breaking structure, which improves the kinetic energy of the breaking structure while improving the impact strength by changing the material density of some areas of the breaking structure and the strength and hardness of the impact end face, thereby avoiding impact damage to the breaking structure caused by increased kinetic energy and improving the breaking reliability caused by impact.

[0004] To achieve the above-mentioned purpose, the present invention provides a large-impulse piston-type disconnecting structure for a circuit protection device, wherein the disconnecting structure includes a plunger section and a leg section; the plunger section is provided with a high-density counterweight block, and an impact structure with strength and hardness greater than that of the leg section is spliced ​​on the impact end surface of the leg section.

[0005] Preferably, the plunger section is a columnar structure or a cylindrical structure.

[0006] Preferably, the counterweight block is arranged on an end surface of the plunger section away from the leg section.

[0007] Preferably, the counterweight block is arranged in the plunger section by injection molding, crimping or screw connection.

[0008] Preferably, at least one circle of sealing groove is provided on the outer circumference of the plunger section, and a sealing member is nested in the sealing groove for sealing the contact surface between the disconnecting structure and the circuit protection device.

[0009] Preferably, a sealing member is integrally formed on the periphery of the plunger segment by two-color injection molding, and the sealing member protrudes from the outer peripheral surface of the plunger segment and is used for sealing the contact surface between the disconnecting structure and the circuit protection device.

[0010] Preferably, the impact structure is spliced ​​with the leg segment in a planar contact manner or a concave-convex splicing manner.

[0011] Preferably, the impact structure is integrally connected to the leg segment by injection molding, crimping or screw connection.

[0012] Preferably, the impact structure is made of an insulating non-metallic material.

[0013] Preferably, the impact structure material is one of alumina, ceramic, composite ceramic, and carbon fiber composite material.

[0014] Preferably, the plunger section and the leg section are integrally formed.

[0015] Preferably, the impact surface of the impact structure is a plane structure or a blade surface structure.

[0016] The large-impulse piston-type breaking structure of the present invention improves the mass of the breaking structure by adding a counterweight block, thereby increasing the kinetic energy of the breaking structure and increasing the impact force. When the mass of the breaking structure is improved and the kinetic energy can be satisfied, the volume of the breaking structure can be reduced accordingly, so that the overall volume of the circuit protection device can be reduced accordingly.

[0017] By splicing a high-strength and high-hardness impact structure on the outrigger section, the impact resistance can be improved, and the breaking structure can be prevented from being damaged or severely deformed during impact, thereby affecting the cutting performance.

[0018] By adding counterweight blocks and splicing impact structures, the weight and material cost of the breaking structure can be reduced while meeting the kinetic energy and strength performance of the breaking structure.

[0019] Through the implementation of the present invention, the breaking capacity brought by the large impulse can increase the structural size of the current-carrying conductor of the excitation fuse to meet the use scenario requirements of larger current conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the split structure of the present invention.

[0021] Figure 2 yes Figure 1Schematic diagram of the longitudinal cross-sectional structure.

[0022] Figure 3 It is a schematic diagram of a longitudinal sectional structure provided with a sealing member.

[0023] Figure 4 It is a schematic diagram of a longitudinal cross-sectional structure with a seal embedded therein.

[0024] Description of reference numerals:

[0025] The plunger section 10, the sealing groove 11, the sealing member 12, the sealing member 12a, the leg section 20, the notch 21, the boss structure 22, the groove 23, the limiting convex block 24, the counterweight block 30, the impact structure 40, the convex ridge 41, and the blade-shaped structure 42. DETAILED DESCRIPTION

[0026] The large-impulse piston-type breaking structure for the circuit protection device of the present invention comprises a plunger section 10 and a leg section 20; the plunger section 10 is provided with a high-density counterweight block 30, and an impact structure 40 having a strength and hardness greater than that of the leg section is spliced ​​on the impact end surface of the leg section 20. Among them:

[0027] See also Figure 1 and Figure 2 The plunger section 10 and the leg section 20 are an integrally formed structure, and the material is an insulating material. The plunger section 10 is a columnar or cylindrical structure. A counterweight block 30 is provided on the end face of the plunger section 10 away from the leg section 20, that is, the end face that bears the force of the high-pressure gas released by the pyrotechnic gas generator. The material of the counterweight block 30 can be a metal material or a non-metallic material with a higher density. The definition of a higher density is that the density of the counterweight block is greater than the density of the material of the plunger section in the separating structure. The counterweight block 30 is connected to the plunger section 10 of the separating structure as a whole by injection molding, crimping, screw connection, etc., and is used to improve the product quality and thereby increase the kinetic energy of the product during movement.

[0028] At least one sealing groove 11 is arranged on the outer circumference of the plunger section 10 along the circumference direction. Figure 2 and Figure 3 A sealing member 12 is sleeved in the sealing groove 11, and the sealing member 12 is a sealing member with a certain elasticity. When the disconnecting structure is arranged in the circuit protection device, the contact surface between the outer peripheral surface of the disconnecting structure and the circuit protection device is sealed by the sealing member 12 to ensure that the high-pressure gas released by the gas generator acts entirely on the disconnecting structure.

[0029] In order to improve the bonding strength between the seal and the plunger section, at least one circle of seal 12a can be embedded in the outer periphery of the plunger section 10 by double-color injection molding when the split structure is formed. Figure 4 , the sealing member 12a protrudes from the outer peripheral surface of the plunger section 10. Figure 4In the embodiment, one sealing member 12a has two circles of sealing ridges 12a-1, and two circles of sealing rings are actually formed by the sealing member 12a.

[0030] The leg section 20 can be configured as a single-leg or multi-leg structure according to functional requirements. Figure 1 and Figure 2 The leg section 20 consists of two legs, and a notch 21 is provided on the impact end face of the leg section 20, and boss structures 22 are formed at both ends of the notch 21. A groove 23 is provided at the notch 21 along the length direction of the notch 21, and an impact structure 40 is nested in the groove 23. The impact structure 40 is made of an insulating non-metallic material whose mechanical strength and hardness are greater than that of the material of the leg section 20, such as one of alumina, ceramic, composite ceramic, and carbon fiber composite material. The impact structure 40 has a convex structure in appearance, including a convex ridge 41. The convex ridge 41 is nested in the groove 23 at the notch 21 to form a spliced ​​concave-convex structure, so that the impact structure 40 covers the notch 21, and the impact end face of the impact structure 40 is a planar structure covering the notch 21. When the disconnecting structure impacts the conductive part of the circuit protection device, the impact structure 40 is in contact with the conductive part. Since the mechanical strength and hardness of the impact structure 40 are higher than the strength and hardness of the leg segment material, when the conductive part is broken, the deformation and damage of the impact structure 40 caused by the impact force are greatly reduced, thereby improving the reliability of the break and reducing the damage to the breaking structure.

[0031] exist Figure 2 In the embodiment, the impact structure 40 is a convex structure, and its impact surface in contact with the conductive member is a flat structure. Figure 3 In the embodiment, the impact structure 40 is a rectangular structure. After the impact structure 40 is nested in the notch 21, the impact end face of the impact structure 40 is a flat structure and protrudes from the notch 21, so as to ensure that when the conductive member is interrupted, it is the impact structure 40 that contacts the conductive member. Figure 4 In the impact structure 40 and Figure 3 Compared with the impact structure in the embodiment, the protruding notch 21 is not a planar structure, but a blade-shaped blade surface structure 42. The blade-shaped structure is more conducive to the concentration of force, increasing the force applied per unit area, making it easier to break the conductive member. Moreover, through the spliced ​​impact structure 40, when its strength and hardness are improved, when breaking the conductive member, the force offset by the smaller deformation is smaller, and the force applied to the conductive member becomes larger accordingly, thereby improving the reliability of the break.

[0032] See also Figure 1 Limiting protrusions 24 are respectively provided on both sides of the leg section 20 to limit the initial position of the separating structure when it is installed.

[0033] The breaking structure of the present invention improves the impact kinetic energy and applied force of the breaking structure without significantly increasing the material cost and molding cost of the breaking structure by setting counterweight blocks of different densities and splicing impact structures of different mechanical strengths and hardnesses.

Claims

1. A large impulse piston type breaking structure for a circuit protection device, characterized in that: The breaking structure comprises a plunger section and a leg section; the plunger section is provided with a high-density counterweight block, and an impact structure having strength and hardness greater than that of the leg section is spliced ​​on the impact end surface of the leg section.

2. The large-impulse piston-type breaking structure according to claim 1 is characterized in that: The plunger section is a columnar structure or a cylindrical structure.

3. The large-impulse piston-type breaking structure according to claim 2 is characterized in that: The counterweight block is arranged on an end surface of the plunger section away from the leg section.

4. The large-impulse piston-type breaking structure according to claim 3 is characterized in that: The counterweight block is arranged in the plunger section by injection molding, crimping or screw connection.

5. The large-impulse piston-type breaking structure according to claim 1 is characterized in that: At least one circle of sealing groove is arranged on the outer circumference of the plunger section, and a sealing member is nested in the sealing groove to seal the contact surface between the disconnecting structure and the circuit protection device.

6. The large-impulse piston-type breaking structure according to claim 1 is characterized in that: A sealing member is integrally formed on the periphery of the plunger segment by two-color injection molding, and the sealing member protrudes from the outer peripheral surface of the plunger segment and is used for sealing the contact surface between the disconnecting structure and the circuit protection device.

7. The large-impulse piston breaking structure according to any one of claims 1 to 6, characterized in that: The impact structure is spliced ​​with the leg section in a planar contact manner or a concave-convex splicing manner.

8. The large-impulse piston breaking structure according to claim 7 is characterized in that: The impact structure is integrally connected to the leg section by injection molding, crimping or screw connection.

9. The large-impulse piston breaking structure according to claim 7, characterized in that: The impact structure is made of insulating non-metallic material.

10. The large-impulse piston breaking structure according to claim 9, characterized in that: The impact structure material is one of alumina, ceramics, composite ceramics, and carbon fiber composite materials.

11. The large-impulse piston breaking structure according to any one of claims 1 to 6, characterized in that: The plunger section and the leg section are integrally formed.

12. The large-impulse piston breaking structure according to any one of claims 1 to 6, characterized in that: The impact surface of the impact structure is a plane structure or a blade surface structure.

Images