CN2252404Y - Multiple used safety tube - Google Patents
Multiple used safety tube Download PDFInfo
- Publication number
- CN2252404Y CN2252404Y CN 95240773 CN95240773U CN2252404Y CN 2252404 Y CN2252404 Y CN 2252404Y CN 95240773 CN95240773 CN 95240773 CN 95240773 U CN95240773 U CN 95240773U CN 2252404 Y CN2252404 Y CN 2252404Y
- Authority
- CN
- China
- Prior art keywords
- ptcr
- protective tube
- sma
- uses according
- repeatedly uses
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Thermistors And Varistors (AREA)
Abstract
The utility model relates to a safety pipe capable of being used by multiple times, which is used for the over-current protection of electric appliances and electric equipment. The utility model is composed of a shape memory alloy (SMA) wire, a switch type positive temperature coefficient resistor (PTCR), a biasing spring and a pipe casing. The SMA wire is connected in parallel with the PTCR. One end of the SMA wire is fixed with one end of the PTCR, and the other end of the SMA wire is movably connected with the other end of the PTCR. The biasing spring is pressed on the movably connected end of the SMA wire through an insulated layer. The function of the biasing spring is to make the SMA wire reset back after electricity is switched off. The utility model has the characteristics of simple structure, reliable work, low room temperature resistance, short operation time, etc. The utility model is a safety pipe capable of being used by multiple times and recovering automatically.
Description
The utility model relates to a kind of protective tube that is used for electrical equipment and electronic equipment overcurrent protection, belongs to the overcurrent protective device technical field.
The protective tube great majority that the overcurrent protection of existing communication, electrical equipment and electronic equipment is used adopt fusible link, belong to disposable use element, just scrap after the protection action is carried out, and need just can play a protective role after artificial the replacing.Marmem (SMA) material has in the characteristics that are higher than a certain temperature (As) back recovery high temperature shape; nickel titante series alloy particularly; be easy to processing; and the life-span is long; be to obtain many-sided new material of using in recent years rapidly; now existing people uses it for over-current protection device " marmem " (day) boat Kubo; prosperous health compiles the P180-181 of China Machine Press (1992) but this device can not recover after the execute protection action voluntarily, could reuse after still need manually recovering.The switching mode PTC resistor (PTCR) that development in recent years is got up has begun to be used for the overcurrent protection (" ptc material and application " Zhou Dongxiang Gong Shu duckweed work the P255-259 of publishing house of HUST (1989)) of communication apparatus, and it has reusable characteristics; but exist the deficiency of resistance value height under the room temperature (being generally about 10 Ω), the application scenario is restricted.
The purpose of this utility model is at the deficiencies in the prior art, and the low and reusable protective tube that repeatedly uses of resistance value under a kind of room temperature is provided.
The purpose of this utility model can adopt following scheme to realize: the utility model can be made up of marmem (SMA) silk, switching mode PTC resistor (PTCR), subsection spring and shell, adopt an end of parallel-connection structure, SMA silk directly to fixedly connected between SMA silk and the PTCR with the end of PTCR, the other end of SMA silk and the other end of PTCR constitute flexible connection, one end of deviator spring is directly fixedlyed connected with the other end of PTCR, and the other end of bias spring is pressed in by insulating barrier on the contact of flexible connection end of SMA silk.Employing SMA silk of the present utility model is as the operating part of switch motion; PTCR is in parallel with the SMA silk, keeps part as open circuit; Bias spring is as the operating part of recovery after power cut path.When the Joule heat of operating current generation makes the temperature of SMA silk be lower than As, protective tube place low-resistance conducting state; When electric current excessive; when making the temperature of SMA silk be higher than As; the SMA deformation of filament; the contact that flexibly connects end is broken away to electrically contact; this moment, voltage was added on the PTCR, PTCR current-limiting protection and heating up, and fast transition is a high-impedance state; keep the SMA silk simultaneously and be in off state, make whole protective tube be in high-impedance state.After the outage, bias spring resets the SMA silk, recovers to electrically contact, and protective tube is in channel status.
The utility model adopts SMA and two kinds of materials of PTC to combine; make full use of the reusability of ptc material and the SMA material low characteristics of resistance value at room temperature; what cooperate bias spring makes the SMA reset response; produce the protective tube that can recover voluntarily; have advantages such as simple in structure, reliable operation, room temperature resistance value low (＜0.1 Ω) and operate time be short; the overcurrent protection that can be widely used in communication, electrical equipment and electronic equipment is a kind of reusable protective tube that repeatedly uses.
Fig. 1 is the profile schematic diagram of the utility model embodiment; Fig. 2 is the tube core structure schematic diagram of embodiment.
The utility model can be according to scheme implementation shown in the drawings.The shell profile of protective tube shown in Figure 1 can adopt the desirable 5～7mm of profile external diameter as common fast thawing protective tube, and internal diameter is 3.5～4.5mm.The tube core of protective tube shown in Figure 2 can adopt the structure of bar type resistor, its diameter can be 2～3mm, constitute by lead-in wire and lead cap 1, copper hoop 2, PTC resistance 3, silver electrode layer 4, SMA silk 5, insulating barrier 6 and spring leaf 7, one end of SMA silk 5 and spring leaf 7 is respectively with copper hoop 2 directly fixedly on the two ends silver electrode layer 4 of PTC resistance 3, the other end of spring leaf 7 is pressed in by insulating barrier 6 on the flexible connection end of SMA silk 5, and lead-in wire and lead cap 1 are realized being electrically connected with the welding that the shell two ends can be passed through.The diameter of SMA silk can be 0.1～1mm.Desirable 1～the 4mm of the length of PTC resistance (distances of two silver electrode interlayers).Spring leaf can adopt phosphor bronze or stainless steel material.For example adopt Φ 0.2 * 8 (mm)
3SMA silk and 0.15 * 0.25 * 5 (mm)
3The phosphor bronze spring leaf, non-operating current (operating current) is 0.15A, SMA silk action when electric current 〉=0.5A is by the 0.5 recovery time＜15S that returns to 0.15A, withstand voltage 〉=250V.Adopt Φ 0.35 * 8 (mm)
3SMA silk and 0.25 * 0.4 * 8 (mm)
3The phosphor bronze spring leaf, non-operating current is 1A, the action of SMA silk is again to recovery time＜10S of 0.5A, withstand voltage 〉=250V by 2A when electric current 〉=2A.
Claims (7)
1. repeatedly use protective tube that is used for electrical equipment and electronic equipment overcurrent protection; form by marmem (SMA) silk, switching mode PTC resistor (PTCR), bias spring and shell; it is characterized in that adopting parallel-connection structure between SMA silk and the PTCR; one end of SMA silk is directly fixedlyed connected with the end of PTCR; the other end of SMA silk and the other end of PTCR constitute flexible connection; one end of bias spring is directly fixedlyed connected with the other end of PTCR, and the other end of bias spring is pressed in by insulating barrier on the contact of flexible connection end of SMA silk.
2. the protective tube that repeatedly uses according to claim 1 is characterized in that there is the silver electrode layer at the two ends of PTCR, direct fixedly connected employing copper cuff structure.
3. the protective tube that repeatedly uses according to claim 1 is characterized in that bias spring adopts spring leaf.
4. the protective tube that repeatedly uses according to claim 1 is characterized in that the shell profile adopts the contour structures of fast thawing protective tube, and external diameter is 5～7mm, and internal diameter is 3.5～4.5mm.
5. the protective tube that repeatedly uses according to claim 1 and 2, the tube core that it is characterized in that protective tube adopts the structure of bar type resistor, and its diameter can be 2～3mm.
6. the protective tube that repeatedly uses according to claim 1 and 2 is characterized in that the length (distances of two silver electrode interlayers) of PTC resistance is 1～4mm.
7. the protective tube that repeatedly uses according to claim 1, the diameter that it is characterized in that the SMA silk is 0.1～1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240773 CN2252404Y (en) | 1995-11-01 | 1995-11-01 | Multiple used safety tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95240773 CN2252404Y (en) | 1995-11-01 | 1995-11-01 | Multiple used safety tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2252404Y true CN2252404Y (en) | 1997-04-16 |
Family
ID=33882292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95240773 Expired - Fee Related CN2252404Y (en) | 1995-11-01 | 1995-11-01 | Multiple used safety tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2252404Y (en) |
-
1995
- 1995-11-01 CN CN 95240773 patent/CN2252404Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204696674U (en) | A kind of surge protector through-flow greatly | |
| CN1050218C (en) | Self-restoring fuse tube | |
| CN2252404Y (en) | Multiple used safety tube | |
| CN113053701A (en) | Automatic recovery fuse | |
| CN205944021U (en) | Drop -out switching device that no fuse can repeatedly be operated | |
| CN101764005B (en) | Alarm type thermal fuse-link | |
| CN211826423U (en) | Piezoresistor failure alarm device | |
| CN106655139B (en) | Surge Protector | |
| CN101847858A (en) | Lightning-protection fuse with reliable alarm and overvoltage surge protection device thereof | |
| CN201515206U (en) | Surge protector | |
| CN209642317U (en) | A kind of pcb board load formula surge protector | |
| CN221008696U (en) | Energy-saving cooling circuit structure for NTC device | |
| CN111403249B (en) | Fuse with spare module | |
| CN220065610U (en) | Breaking device and surge protector | |
| CN201226330Y (en) | Overload protection unit for pyromagnetic circuit breaker with lower rating current | |
| CN201681780U (en) | Lightening-proof fuse with reliable alarming and surge overvoltage protection device thereof | |
| CN2205593Y (en) | Marmen current limiting protector | |
| CN2268330Y (en) | Three-end over-voltage suppressor | |
| CN215267635U (en) | Switch type lightning protection module with remote signaling and tripping functions | |
| CN2638232Y (en) | Self-restoring over-current protective combined device | |
| CN2182477Y (en) | Multi-function circuit protector | |
| CN200941554Y (en) | Full non-locking security unit | |
| CN2250524Y (en) | Self protective and limited electric meter | |
| CN210925930U (en) | Static contact device | |
| CN215340769U (en) | Breaker and power consumption control system based on Internet of things |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |