CN107301936A - A kind of current over-load protector structure - Google Patents
A kind of current over-load protector structure Download PDFInfo
- Publication number
- CN107301936A CN107301936A CN201710678614.9A CN201710678614A CN107301936A CN 107301936 A CN107301936 A CN 107301936A CN 201710678614 A CN201710678614 A CN 201710678614A CN 107301936 A CN107301936 A CN 107301936A
- Authority
- CN
- China
- Prior art keywords
- thermal cut
- protective device
- overload protective
- metal shell
- holding piece
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/20—Electrothermal mechanisms with fusible mass
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
A kind of current over-load protector structure; including overload protective device and thermal cut-off; heating wire, movable contact spring, moving contact and the static contact of overload protective device access the circuit of electrical equipment in series; form loop; moving contact is arranged on movable contact spring; static contact is corresponding with moving contact; bimetal leaf is arranged between movable contact spring and heating wire; thermal cut-off has connection end and metal shell; metal shell is a pole of thermal cut-off; connection end is another pole of thermal cut-off, and metal shell is clamped by conductive holding piece；Holding piece, thermal cut-off are connected with above-mentioned circuit in series, and the fusing-off temperature of thermal cut-off is thermally deformed temperature higher than bimetal leaf.The present invention is it is possible to prevente effectively from because overload protective device exceeds life span; the bimetal leaf of overload protective device easily produces metal fatigue and can not be thermally deformed, or because contact clinkering, adhesion that current anomaly is caused cause the potential safety hazard that overload protective device can not be produced by normal work.
Description
Technical field
The present invention relates to the protection device of electrical equipment, particularly a kind of current over-load protector structure.
Background technology
Many electrical equipments are during use, it may appear that draw because of load excessive, line short, apparatus insulated aging
The line current risen is excessive；If being continuing with equipment when line current is excessive, its heating can be caused or even burnt, if line
Road, which is chronically at, can also reduce the insulating properties of circuit under forceful electric power effect or burn circuit.
Therefore, electrical equipment typically can all connect overload protective device, abnormal conditions occur in electrical equipment operation process
When causing electric current excessive, excessive electric current can cause line temperature to raise, and the bimetal leaf in overload protective device can be because heated
Deformation, the action of deformation causes bimetal leaf to push movable contact spring open, makes the moving contact of overload protective device be separated with static contact, so that
The loop of equipment is disconnected, it is to avoid electrical equipment is run under excessive electric current for a long time, reaches the purpose of protection electrical equipment.
However, the equipment changed regularly in some loads, such as ice machine, compressor, or be other reasonses
Cause the electrical equipment that actual current is unstable, the running current more than equipment rated current, in other words, mistake frequently occurs
Carry protector start may cut off electric current regularly.Overload protective device long-term action, and the elasticity recovery of bimetal leaf
It is limited, recovers to be likely to cause biplate spring fatigue after limit more than elasticity；Or due to touching that current anomaly is caused
First melt knot, adhesion cause overload protective device can not normal work；These reasons cause bimetal leaf not to be thermally deformed normally, draw
Play the failure of overload protective device.Once overload protective device fails, then electrical equipment is easily burnt, there is potential safety hazard.
The content of the invention
In order to further increase the security performance of electrical equipment, it is contemplated that one kind is provided in current overload, and mistake
Carrying the bimetal leaf of protector normally in the case of start, can not can also cut off the overload protective device of circuit protection electrical equipment.
A kind of current over-load protector structure, including overload protective device and thermal cut-off, it is the heating wire of overload protective device, dynamic
Reed, moving contact and static contact access the circuit of electrical equipment in series, form loop, moving contact is arranged on movable contact spring, quiet
Contact is corresponding with moving contact, and bimetal leaf is arranged between movable contact spring and heating wire, and thermal cut-off has outside connection end and metal
Shell, metal shell is a pole of thermal cut-off, and connection end is another pole of thermal cut-off, and metal shell is by conductive holding piece
It is clamped；Holding piece, thermal cut-off be connected with above-mentioned circuit in series, and thermal cut-off fusing-off temperature higher than bimetal leaf by
Thermal distorsion temperature.
During normal operation circuit, moving contact is in engagement state with static contact.During current overload, heating wire produces enough
Heat causes bimetal leaf to be thermally deformed, and pops up promotion movable contact spring so that moving contact is separated with static contact, and circuit is cut
It is disconnected, so as to protect equipment.Now, thermal cut-off not start.If the overload current duration is long and bimetal leaf
It is failure to actuate in the case of cut-out circuit, thermal cut-off will fuse and cut off circuit, so as to be effectively protected equipment, it is to avoid set
The standby high temperature produced by overload current burns.
Current over-load protector of the present invention, due to its thermal cut-off only bimetal leaf can not start when ability start
Circuit is cut off, duplicate protection has been carried out equivalent to circuit.Often exceed the equipment of rated current for some actual currents, if
Operating overload protector carries out the protection of circuit, then easily because its electric current frequently overload causes the regular work of overload protective device
Dynamic, the bimetal leaf of overload protective device easily produces metal fatigue and can not resetted, and causes overload protective device failure can not be normal
Protection circuit and equipment；Either because contact clinkering, adhesion that current anomaly is caused cause overload protective device can not normal work
Make so that there can be potential safety hazard using common overload protective device.The present invention can be effectively prevented from such case, eliminate safety
Hidden danger.Even if bimetal leaf fails, thermal cut-off can carry out second of protection, and thermal cut-off be it is not reducible, one
Circuit has been cut off in denier thermal cut-off start, it is necessary to artificial to carry out changing fusible link reclosing circuit, and thermal cut-off
It is based on bimetal leaf failure just meeting start, so serving the effect for reminding maintainer to overhaul overload protective device, it is to avoid
Maintainer periodically will carry out inspection to overload protective device.More than, after being implied this invention removes safety, also cause
The step of maintenance, is simplified, and saves the cost of labor of inspection.
Brief description of the drawings
Fig. 1 is the exploded perspective view of overload protective device structure.
Fig. 2 is the overall schematic of overload protective device structure.
Embodiment
As shown in Figure 1 and Figure 2, overload protective device structure of the invention includes base, cover plate, binding post 13, thermal fuse-link
1st, intermediate plate 2, heating wire 3, quiet pin 801, quiet pin 803, quiet pin 804 pad, movable contact spring 7, moving contact 5 and static contact 6, pin 10.
Movable contact spring 7 is a strip sheet metal, and its right-hand member bottom sets moving contact 5, and left upper part sets pad 12 to weld therewith, left end
Bottom and the upper surface of the high spot of block quiet pin 801 are welded.Quiet pin 801 also has recess, the recess and right side at one
The recess position correspondence of the quiet pin 804 set, the two ends of heating wire 3 are individually connected at the recess of the quiet pin in both sides, generated heat
Silk top sets bimetal leaf 4.The slightly higher place in right side of quiet pin 804 sets quiet pin 803, and quiet pin 803 is welded with static contact 6, stationary contact
First 6 are in contact with moving contact 5.Said structure is inside base, cover plate, and lid surface side is connected to pin 10, pin 10
Welded with quiet pin 803.The surface of base is provided with the holding piece 2 being generally triangular in shape, and holding piece bottom is welded on quiet pin
On 804, its two side flexibly clamps the metal shell of thermal cut-off 1, and thirdly side is designed with and thermal cut-off shape phase
Suitable groove so that holding piece 2 is in close contact with thermal cut-off；Thermal cut-off of the present invention only one end has at wiring,
Other end is to carry out conduction by its metal shell, because the metal shell of thermal cut-off is clamped the held tight of piece 2, and is pressed from both sides
Holding piece is welded with quiet pin 804 again, so thermal cut-off forms series loop between quiet pin 804.The surface connection of cover plate
There is binding post 13, thermal cut-off is connected by a wire for being bent into " Z " shape with binding post 13.
Binding post 13 accesses circuit with pin 10 so that overload protective device series connection of the invention is in circuit.Electric current according to
It is secondary flow through binding post 13, it is thermal cut-off 1, holding piece 2, quiet pin 804, heating wire 3, quiet pin 801, movable contact spring 7, moving contact 5, quiet
Contact 6, quiet pin 803, pin 10, form a series circuit.During normal operation circuit, moving contact 5 is in joint shape with static contact 6
State, therefore circuit connected.When abnormal conditions occur in electrical equipment operation process and causing electric current excessive, heating wire is lasting
Bimetal leaf above heating, heating wire is thermally deformed, and pushes up movable contact spring 7 so that moving contact 5 is separated with static contact 6, electricity
Road is cut off；Now, the fuse of thermal cut-off does not reach fusing-off temperature also, so action will not be produced.In overload protective device
Because bimetal leaf produce metal fatigue and can not be thermally deformed or due to current anomaly caused by contact clinkering, adhesion and can not
Make in current overload in the case that moving contact 5 separates with static contact 6, thermal cut-off is heated continuously and temperature continues to rise,
When reaching fusing-off temperature, then thermal cut-off fuses and cuts off circuit.
It should be evident that to reach thermal cut-off only bimetal leaf can not start when ability start this effect, hot melt is disconnected
The fusing-off temperature of device will be higher than the deformation temperature of bimetal leaf, and mistake start otherwise may occurs, both thermal cut-off was first
Fusing-off temperature is reached, and bimetal leaf is not up to and is thermally deformed temperature.Though wrong start also can cut off electric circuit protection equipment not
It is burned out, but because thermal cut-off is not reducible part, must be changed manually after fusible link fusing, it is cumbersome.It is based on
This, bimetal leaf operating temperature of the present invention is lower than thermal fuse-link fusing-off temperature about 10 DEG C~30 DEG C, this rational temperature range
Setting both can guarantee that the thermal cut-off only ability start in the case where bimetal leaf fails, and will not also be set due to temperature range
It is big to cause thermal cut-off during overload not reach fusing-off temperature and circuit be cut off.
Claims (5)
1. a kind of current over-load protector structure, including overload protective device and thermal cut-off（1）, the heating wire of overload protective device
（3）, movable contact spring（7）, moving contact（5）With static contact（6）The circuit of electrical equipment is accessed in series, loop is formed, and moving contact is set
Put on movable contact spring, static contact is corresponding with moving contact, bimetal leaf（4）It is arranged between movable contact spring and heating wire, its feature
It is：Thermal cut-off has connection end and metal shell, and metal shell is a pole of thermal cut-off, and connection end is the another of thermal cut-off
One pole, metal shell is by conductive holding piece（2）It is clamped；Holding piece（2）, thermal cut-off（1）Connect with above-mentioned circuit in series
Connect, and the fusing-off temperature of thermal cut-off is higher than bimetal leaf（4）Be thermally deformed temperature.
2. a kind of current over-load protector according to claim 1, it is characterised in that：Holding piece（2）Be generally shaped like
Triangle, its bottom is welded on the quiet pin of overload protective device（804）It is upper and in communication.
3. a kind of current over-load protector according to claim 1 or 2, it is characterised in that：Holding piece（2）Two sides are under
It is supreme gradually close to and it is non-intersect, the metal shell of thermal cut-off is clamped by its two side, and three sides of holding piece are tangible
The groove that shape is mutually fitted with thermal cut-off shape, makes the metal shell of thermal cut-off be closely connected with holding piece.
4. a kind of current over-load protector according to claim 1, it is characterised in that：Bimetal leaf is thermally deformed temperature
It is lower than the fusing-off temperature of thermal fuse-link 10 DEG C~30 DEG C.
5. a kind of current over-load protector according to claim 1, it is characterised in that：The connection end of thermal cut-off and overload
The binding post of protector（13）Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710678614.9A CN107301936A (en) | 2017-08-10 | 2017-08-10 | A kind of current over-load protector structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710678614.9A CN107301936A (en) | 2017-08-10 | 2017-08-10 | A kind of current over-load protector structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107301936A true CN107301936A (en) | 2017-10-27 |
Family
ID=60133528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710678614.9A Pending CN107301936A (en) | 2017-08-10 | 2017-08-10 | A kind of current over-load protector structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107301936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113838722A (en) * | 2021-08-18 | 2021-12-24 | 广州森宝电器股份有限公司 | Overload protection device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202423172U (en) * | 2012-01-31 | 2012-09-05 | 广州市森宝电器有限公司 | Overload protector |
| CN105261522A (en) * | 2015-11-03 | 2016-01-20 | 佛山市德沁电器有限公司 | Temperature controller with temperature and current protection functions |
| CN207183192U (en) * | 2017-08-10 | 2018-04-03 | 广州森宝电器股份有限公司 | A kind of current over-load protector structure |
-
2017
- 2017-08-10 CN CN201710678614.9A patent/CN107301936A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202423172U (en) * | 2012-01-31 | 2012-09-05 | 广州市森宝电器有限公司 | Overload protector |
| CN105261522A (en) * | 2015-11-03 | 2016-01-20 | 佛山市德沁电器有限公司 | Temperature controller with temperature and current protection functions |
| CN207183192U (en) * | 2017-08-10 | 2018-04-03 | 广州森宝电器股份有限公司 | A kind of current over-load protector structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113838722A (en) * | 2021-08-18 | 2021-12-24 | 广州森宝电器股份有限公司 | Overload protection device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6247402B2 (en) | DC high voltage type thermal fuse | |
| KR101116087B1 (en) | Protection apparatus | |
| CA2785605C (en) | Switchgear unit for switching high dc voltages | |
| CN203300549U (en) | Temperature fuse protector with dual-protection function | |
| CN103346533A (en) | Circuit structure with protection function | |
| CN105261522A (en) | Temperature controller with temperature and current protection functions | |
| CN102678508A (en) | Air conditioner compressor provided with motor protector, and air conditioner | |
| CN207183192U (en) | A kind of current over-load protector structure | |
| CN107301936A (en) | A kind of current over-load protector structure | |
| CN2585394Y (en) | Hot fusiable cut-out protector | |
| CN203799960U (en) | Temperature controllable protective tube | |
| CN208189496U (en) | A kind of Thermal protection type control switch | |
| CN203950625U (en) | Novel heat protection piezo-resistance and Surge Protector | |
| CN202108684U (en) | Air-conditioner compressor with protector for motor and air-conditioner | |
| CN201011649Y (en) | Three-phase compressor built-in protector | |
| CN204189712U (en) | A kind of circuit protection device | |
| CN210200632U (en) | Overcurrent and overtemperature protector capable of being reset manually in power-off mode | |
| CN102254744A (en) | Built-in protector of three-phase compressor | |
| CN209859871U (en) | Thermal protector with double protection functions | |
| CN112863794A (en) | Temperature-sensitive PTC protector | |
| JP4905947B2 (en) | Protective device | |
| CN202523637U (en) | Open type temperature protector | |
| CN205248189U (en) | Temperature controller with temperature and electric current protect function | |
| CN101419880B (en) | Thermal protector for three-phase motor | |
| JP2010086675A (en) | Circuit protection structure performing double temperature-sensitive interruption |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Huang Zhihang Inventor after: Shi Qingsheng Inventor after: Zeng Qingyi Inventor after: Xuan Tao Inventor before: Huang Zhihang |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171027 |