Impactor and fuse
Through the series connection of high-strength metal wire and Conco wire, combined with clamping limit parts and insulating sleeve, the problem of insufficient strength of Conco wire in existing fuses is solved, simplifying the assembly process and improving product stability and The yield rate achieves effective alarm and current flow.
Patent Information
- Application Number
- CN202421103655.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The Conco copper wire used in existing fuses has problems such as insufficient strength and easy breaking during assembly and use, which leads to high assembly difficulty and low product yield, and is unable to effectively promote the trip mechanism or alarm device.
High-strength metal wire and Conco wire are connected in series, and the wire is bound to ensure that the spring has sufficient elasticity. Combined with clamping limits and insulating sleeves, the stability and reliability of conductive connections are achieved, simplified the assembly process, and avoided Tension operation of Conco copper wire during assembly.
It improves the assembly difficulty and yield of the fuse, ensures the stability and conductivity of the striker, reduces the risk of breaking the Conco copper wire, and realizes effective alarm and current flow after the melt is fused.
Smart Images
Figure CN222320165U_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of electronic components, and specifically relates to a tripping mechanism for pushing a load switch, a striker for alarming, and a fuse using the striker. Background Art
[0002] In circuit protection, commonly used electronic components are fuses, which usually include a fuse tube, a fuse element, an inner cap, and a contact. The fuse is used in series in the circuit. When the circuit is overloaded or short-circuited, the fuse element melts, thereby disconnecting the circuit. However, since the circuit protected by the fuse is not within the monitoring range, when the circuit fails and the fuse melts, the operator cannot find the circuit fault in the first time. Therefore, in order to solve this problem, an alarm device is added to the fuse. Usually, the alarm device in the fuse includes a cover plate, a spring, and a constantan wire. When the fuse is assembled, the cover plate and the spring are installed on the fuse tube. After the cover plate is bound by the constantan wire and the spring is in a compressed state, the two ends of the constantan wire are conductively connected to the inner caps at both ends of the fuse tube. When the fuse melts and the constantan wire melts, the cover plate loses its binding force, and the cover plate is pushed out under the action of the spring elastic force, and an alarm is sounded. Although this alarm device has a good alarm effect, it has a major drawback: during assembly, it is very difficult to tighten the constantan wire in the fuse tube and fix its two ends on the inner caps at both ends of the fuse tube. In addition, the constantan wire has a low strength and is easily broken or worn off, resulting in assembly failure, or the constantan wire is disconnected after the fuse is assembled, reducing the product yield. In addition, the constantan wire has a low strength, and the spring elasticity that can be bound is small, so the trip plate cannot be pushed open. Summary of the invention
[0003] The purpose of the patent of this invention is a striker and a fuse. The striker can be made in advance. When used in the fuse, there is no need to tension the constantan wire. It is only necessary to connect one end of the constantan wire to the inner cap at one end of the fuse tube. The assembly is convenient, the assembly difficulty is low, and the assembly quality is high.
[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is a striker, comprising a tubular guide member with an open end and a closed end, a tubular striker that can be displaced relative to the guide member is sleeved in the guide member, the striker has an open end and a closed end, the open end of the striker is located at the closed end of the guide member, and the closed end of the striker is located at the open end of the guide member; a spring is fixedly arranged between the striker and the guide member, one end of the spring is fixed to the closed end of the guide member, and the other end of the spring is fixed to the closed end of the striker; a conductive metal wire is conductively connected in the guide member, the metal wire binds the striker in the guide member and puts the spring in a compressed state; the free end of the metal wire passes through the closed end of the guide member and is located outside the guide member; a clamping limiter is arranged at the metal wire outside the closed end of the guide member, and the clamping limiter clamps and positions the metal wire against the end face outside the closed end of the guide member.
[0005] Preferably, a limiting member is provided between the open end of the guide member and the striker, and the limiting member is fixed on the guide member; the open end of the striker is an outwardly expanded structure, and when the striker is displaced outward relative to the guide member under the elastic force of the spring, the limiting member limits the terminal position of the striker.
[0006] Preferably, a hook is provided at the closed end of the striker, one end of the metal wire is fixed to the closed end of the guide member, the free end of the metal wire passes through the hook, and the closed end of the guide member is located outside the guide member.
[0007] Preferably, an insulating sleeve is sleeved on the striker and the metal wire inside the guide member.
[0008] Preferably, a constantan wire is connected in series to one end of the metal wire at the clamping positioning member, and a free end of the constantan wire extends out of the clamping limiting member.
[0009] Preferably, reinforcing and insulating gaskets are respectively provided on the inner and outer sides of the closed end of the guide member; the open end of the striker is located between the guide member and the gasket located inside the guide member, and one end of the spring and the clamping limit member are respectively pressed against the gasket, and the gasket is respectively fixed on the inner and outer sides of the closed end of the conductive member.
[0010] Preferably, a positioning edge is extended toward the outer circumference from the end of the opening of the guide member to facilitate installation.
[0011] The present invention also provides a fuse, comprising a fusion tube, with an inner cap and a contact respectively arranged at both ends of the fusion tube, a melt passed through the fusion tube, and the two ends of the melt respectively fixed on the inner cap; the above-mentioned striker is passed through and fixed at the contact and the inner cap at one end of the fusion tube, the guide piece of the striker is conductively connected to the contact, the free end of the metal wire or constantan wire of the striker is conductively connected to the inner cap at the other end of the fusion tube, and the fusion tube is filled with an arc extinguishing medium.
[0012] Preferably, the melt is in a bent wave structure in its length direction, and both ends of the melt are fixedly connected to the inner cap via two welding points respectively.
[0013] The striker of the present invention adopts a high-strength metal wire and a constantan wire with good electrical conductivity in series. The high-strength metal wire binds the striker, so that the spring has sufficient elasticity, ensuring that the striker has a sufficiently large stroke and impact force, and conveniently pushes the tripping mechanism or micro switch to change its working state. Due to the good electrical conductivity of the constantan wire, the current flows through the constantan wire, the metal wire, and the guide member after the melt is melted.
[0014] By clamping the fixing piece to position the metal wire that restrains the striker, the striker can be easily installed. There is no need to tighten the metal wire when the striker is installed, which saves assembly steps and reduces assembly difficulty.
[0015] The use of a fuse with a striker can increase the difficulty of fuse assembly and improve the fuse assembly yield rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the impactor structure.
[0017] Figure 2 This is a schematic diagram of the structure of the impactor after working.
[0018] Figure 3 It is a schematic diagram of the fuse structure.
[0019] Figure 4 It is a structural schematic diagram of the connection between the spring card and the inner cap.
[0020] Reference numerals:
[0021] Contact 1, inner cap 2, welding point 21, melting tube 3, arc extinguishing medium 4, melt 5, metallurgical effect point 6, inner cap 7, contact 8, striker 9, guide piece 91, striker 92, limiting piece 93, gasket 94, spring 95, hook 96, clamping limit piece 98, metal wire 99, spring card 10, constantan wire 11, welding point 101. DETAILED DESCRIPTION
[0022] With respect to the above technical solution, preferred embodiments are now cited and specifically described in conjunction with drawings.
[0023] The impactor 9 of the present invention is shown in FIG. Figure 1 and Figure 2 , including a guide member 91, which is a straight tube structure with one end open and the other end closed. Insulating gaskets 94 are provided on both the inner and outer sides of the closed end of the guide member 91 to strengthen the strength of the closed end of the guide member. A positioning edge is formed at the end of the open end of the guide member 91 extending toward the periphery to facilitate the installation and fixation of the striker.
[0024] A striker 92 is sleeved in the guide member 91. The striker 92 is a tubular structure with one end open and the other end closed. The open end of the striker 92 expands toward the periphery to form an outward expansion structure. The open end of the striker 92 is located at the closed end of the guide member 91, and the closed end of the striker 92 is located at the open end of the guide member 91. The open end of the striker 92 is arranged in contact with the inner wall of the guide member 91, and the open end of the striker 92 is nested between the guide member 91 and the gasket located inside the guide member 91.
[0025] A limiting member 93 is provided at the open end of the guide member 91 and between the guide member 91 and the striker 92. The guide member 91, the striker 92 and the limiting member 93 are closely matched to limit the end position of the striker 92. The limiting member 93 is fixedly provided in the open end of the guide member 91.
[0026] One end of the spring 95 is pressed against the gasket 94 in the guide member 91, and the other end is fixedly connected to the closed end of the striker 92. A hook 96 is fixedly arranged in the closed end of the striker 92, and a metal wire 99 is passed through the hook 96. The metal wire 99 is a high-strength, high-resistance metal wire, and the direction of the metal wire is changed by the hook 96. Two through holes for the metal wire 99 to pass through are opened at the closed end of the conductive member 91. One end of the metal wire 99 is fixedly connected to the positioning edge outside the conductive member 91, and is arranged to fit the outer side surface of the guide member 91. The other end of the metal wire 99 passes through the through hole of the closed end of the guide member 91 close to the side of the guide member 91 and the gasket 94 located in the conductive member 91. The metal wire 99 is pressed by the gaskets 94 located on both sides of the closed end of the conductive member 91, and then passes through the through hole and the gasket 94 at the closed end of the conductive member 91 close to the center of the conductive member 91 and is located outside the end of the closed end of the conductive member 91. Such a structure can ensure that the metal wire is electrically connected to the conductive member and that the connection of the metal wire is reliable.
[0027] The metal wire 99 passes around the hook 96 of the striker 92, and binds the striker 92 in the guide member 91. The spring is pressed into the conductive member and the striker 92 through the closed end of the striker 92. At this time, the metal wire is in a tensioned state, and the spring 95 is in a compressed state. Through the compression of the gasket 94, the metal wire 99 is not easy to be separated from the conductive member 91 when being tensioned, and the conductive connection with the conductive member 91 is maintained. One end of the metal wire 99 located outside the guide member 91, that is, the free end of the metal wire 99 is connected in series with the constantan wire 11, and the end of the constantan wire 11 not connected in series with the metal wire 99 is a free end. Since the metal wire 99 is a high-strength metal wire, it is not easy to be broken when the striker is bound by the metal wire 99, thereby improving the working reliability of the striker. The clamping limiter 98 is an elastic deformation member, located outside the closed end of the guide member 91, clamping and fixing the tensioned wire 99 outside the conductive member 91. A positioning piece is fixed at one end of the clamping limiter 98 facing the closed end of the conductive member. After the clamping limiter 98 is deformed by the tension of the wire 99, the positioning piece of the clamping limiter 98 abuts against the gasket 94 outside the closed end of the guide member 91, positioning the clamping limiter 98. While the clamping limiter 98 fixes the gasket 94 outside the guide member 91, it limits the tensioned wire, so that the tensioned wire maintains tension to prevent the tensioned wire 99 from loosening. The striker 92 is limited in the guide member 91 by the tensioned wire 99, and the spring 95 is compressed. The clamping stopper 98 may not be provided with a positioning piece, as long as the outer diameter of the clamping stopper 98 is larger than the inner diameter of the hole for the metal wire 99 to pass through the gasket 94 provided at the closed end of the conductive member 91. One end of the constantan wire 11 connected in series with the metal wire 99 is located outside the clamping stopper 98, or located in the clamping stopper 98, and the free end of the constantan wire 11 is in a relaxed state and is not subjected to the tension of the metal wire 99.
[0028] An insulating sleeve 97 is provided around the outer periphery of the metal wire 99 on one side of the hook 96 in the striker 92 to prevent the metal wires on both sides of the hook from conducting into contact, which would result in a decrease in electrical performance.
[0029] When in use, the free end of the constantan wire 11 is connected in series in the main circuit, and a micro switch or a tripping mechanism is provided on one side of the closed end of the striker, and the micro switch or the tripping mechanism is connected in series in the alarm circuit. Since the constantan wire 11 is not subjected to the tension of the metal wire 99, when its free end is connected in series in the main circuit, the constantan wire is in a relaxed state and will not be pulled or worn off, thus avoiding the risk of failure of the striker due to the disconnection of the constantan wire. Moreover, since both the metal wire and the constantan wire have high resistance values, in the working state, almost all the current flows through the main circuit, and the current flowing through the constantan wire and the metal wire can be ignored.
[0030] The constantan wire may not be connected in series, so that the free ends of the metal wire outside the conductive member and the clamping limiter are in a relaxed state, and only the metal wire part inside the clamping limiter and the conductive member is in a tensioned state.
[0031] When the main circuit is overloaded and short-circuited, the current passes through the constantan wire and the metal wire, and the constantan wire and the metal wire are both melted, and the striker loses its restraining force. Under the elastic force of the spring, the striker pops out of the guide piece, and the open end of the striker is restricted by the restriction piece and stays in the guide piece to prevent the striker from leaving the guide piece, forming a limit on the end position of the striker. The striker that pops out of the guide piece hits the micro switch or the tripping mechanism, changing the switch state of the micro switch or the state of the tripping mechanism, making the alarm circuit conductive and giving an alarm.
[0032] When the striker 9 is used in the fuse, see Figure 3 and Figure 4 The fuse structure mainly includes: contacts (1, 8), inner caps (2, 7), melting tubes 3, arc extinguishing medium 4, melt 5, melt metallurgical effect point 6, striker 9, spring card 10, among which.
[0033] The melting tube 3 is a tubular structure with openings at both ends. It is made of high-strength ceramic tubes, such as alumina ceramic tubes, which can withstand the high temperature and high pressure generated by breaking short-circuit currents, avoiding the risk of yellowing, blackening, or even arc leakage caused by the epoxy resin impregnated fiberglass tube being unable to withstand high temperatures.
[0034] The two ends of the fuse tube 3 are connected to inner caps (2, 7) respectively, and the two ends of the fuse tube 3 outside the inner caps (2, 7) are connected to contacts (1, 8) respectively. The inner caps (2, 7) are cap-shaped structures, made of conductive materials. The contacts (1, 8) are also cap-shaped structures, made of conductive materials, and are in conductive contact with the inner caps. The contacts (1, 8) are wiring terminals for connecting the fuse to other circuits. A cavity is reserved between the contacts (1, 8) and the inner caps (2, 7).
[0035] The melt 5 is made of high-purity silver. The melt 5 is a long sheet structure with a bent wave structure. The bending process can withstand the impact of the starting current of the motor. A plurality of melts 5 are arranged in a straight-pull parallel structure in the melting tube 3. The two ends of the melt 5 pass through the inner cap (2, 7) and are welded to the inner cap (2, 7). When the end of each melt 5 is welded to the inner cap, two welding points 21 are used to ensure that when one of the welding points 21 fails, the other welding point 21 can ensure the conductive connection between the melt 5 and the inner cap. When the fuse is subjected to vibration impact, the bent wave structure of the melt 5 can buffer part of the vibration impact energy and improve the shock resistance of the fuse. The melt adopts a straight-pull parallel structure to avoid crossing, confusion, entanglement, and inconsistent shapes between the melts.
[0036] A metallurgical effect point 6 is arranged at the center of the melt 5 along the length direction, and a plurality of narrow necks are arranged at intervals and evenly on both sides of the metallurgical effect point 6 along the length direction of the melt 5. The metallurgical effect point 6 is located on one or both sides of the melt 5. The melting point of the material of the metallurgical effect point 6 is lower than that of the melt 5. By combining the narrow neck metallurgical effect point, the minimum breaking current of the fuse is reduced to 2.1kA, and the small current breaking capacity of the fuse is improved; by combining the narrow neck metallurgical effect point, the dual protection of the fuse against overload and short circuit is realized.
[0037] The melting tube 3 is filled with an arc extinguishing medium 4, which is made of high-purity quartz sand. The high-purity quartz sand absorbs arc energy when breaking short-circuit current and has a strong arc extinguishing ability.
[0038] A spring card 10 is welded on the surface of the inner cap 7 at one end of the melting tube 3 facing the center direction of the melting tube 3, and the two ends of the spring card 10 are conductively connected to the inner cap 7 through welding points 101. A striker 9 is fixedly arranged in the contact 1 at the other end of the melting tube 3, and the constantan wire 11 on the striker 9 passes through the melting tube 3 and is welded on the spring card 10. The constantan wire 11 is in a relaxed state, and the constantan wire 11 is located in the melting tube 3, not affected by the tension force of the metal wire, and does not contact the melting tube 3. Therefore, there is no risk of the constantan wire 11 located in the melting tube 3 being pulled off or worn off. The open end of the striker 9 is located in the contact 1 and passes through the inner cap. The positioning edge of the conductive member 91 of the striker 9 is located outside the contact 1 and is conductively connected and fixed to the outer side of the end face of the contact 1.
[0039] When the fuse is in use, a micro switch can be set on one side of the fuse. When the fuse striker pops out, the switch state of the micro switch can be changed, so that the alarm circuit connected in series with the micro switch is turned on and an alarm is sounded.
[0040] It can also be used in load switch-fuse combination appliances, where the striker pushes the release of the matching load switch to open the switch.
[0041] Working principle of fuse with striker:
[0042] The fuse is connected in series in the main circuit for circuit protection. Since the constantan wire of the striker is connected in series with the contacts and inner caps at both ends of the fuse, it is equivalent to the striker being connected in series in the main circuit, which is equivalent to the fuse and the constantan wire being connected in parallel and then connected in series in the main circuit. Since the resistance of the constantan wire and the metal wire are much higher than the resistance of the fuse, under normal working conditions, almost all the current flows through the fuse. However, when the main circuit is overloaded and short-circuited, after the fuse of the fuse melts, the current flows through the constantan wire and the metal wire. Under the thermal effect, the constantan wire and the metal wire are both melted, and the striker loses its restraint force. Under the elastic force of the spring, it overcomes the restriction of the limiting component and pops the striker out of the fuse housing, triggering the trip plate or the alarm circuit to alarm.
Claims
1. A striker, characterized in that: It comprises a tubular guide member with one end open and the other end closed, a tubular striker which can be displaced relative to the guide member is sleeved in the guide member, the striker has one end open and the other end closed, the open end of the striker is located at the closed end of the guide member, and the closed end of the striker is located at the open end of the guide member; a spring is fixedly arranged between the striker and the guide member, one end of the spring is fixed to the closed end of the guide member, and the other end of the spring is fixed to the closed end of the striker; A conductive metal wire is conductively connected in the guide member, and the metal wire binds the striker in the guide member and puts the spring in a compressed state; The free end of the metal wire passes through the closed end of the guide member and is located outside the guide member; a clamping limiter is provided at the metal wire outside the closed end of the guide member, and the clamping limiter clamps and positions the metal wire against the end surface outside the closed end of the guide member.
2. The impactor according to claim 1, characterized in that A limiting member is arranged between the opening end of the guide member and the striker, and the limiting member is fixed on the guide member; the opening end of the striker is an outwardly expanded structure, and when the striker is displaced outwardly relative to the guide member under the elastic force of the spring, the limiting member limits the terminal position of the striker.
3. The impactor according to claim 1, characterized in that A hook is arranged at the closed end of the striker, one end of the metal wire is fixed on the closed end of the guide, the free end of the metal wire passes through the hook, and the closed end of the guide is located outside the guide.
4. The impactor according to claim 3, characterized in that: An insulating sleeve is sleeved on the striker and the metal wire inside the guide member.
5. The impactor according to claim 1, characterized in that: One end of the metal wire at the clamping and limiting member is connected in series with a constantan wire, and a free end of the constantan wire extends out of the clamping and limiting member.
6. The impactor according to claim 1, characterized in that Reinforcing and insulating gaskets are respectively arranged on the inner and outer sides of the closed end of the guide member; the open end of the striker is located between the guide member and the gasket located inside the guide member, and one end of the spring and the clamping limit member are respectively pressed against the gasket, and the gasket is respectively fixed on the inner and outer sides of the closed end of the guide member.
7. The impactor according to claim 1, characterized in that The end of the opening end of the guide member extends toward the outer circumference to form a circle of positioning edges for easy installation.
8. A fuse, characterized in that: It comprises a melting tube, with inner caps and contacts respectively arranged at both ends of the melting tube, a melt passed through the melting tube, and both ends of the melt fixed on the inner caps respectively; a striker according to any one of claims 1 to 7 is passed through and fixed on the contact and the inner cap at one end of the melting tube, a guide piece of the striker is conductively connected to the contact, a free end of a metal wire or a constantan wire of the striker is conductively connected to the inner cap at the other end of the melting tube, and an arc extinguishing medium is filled in the melting tube.
9. The fuse according to claim 8, characterized in that: The melt is in a bent wave structure in its length direction, and both ends of the melt are fixedly connected to the inner cap via two welding points respectively.