CN207265641U - A kind of excessive automatic power-off protection device of household electrical appliances resistance - Google Patents
A kind of excessive automatic power-off protection device of household electrical appliances resistance Download PDFInfo
- Publication number
- CN207265641U CN207265641U CN201720173080.XU CN201720173080U CN207265641U CN 207265641 U CN207265641 U CN 207265641U CN 201720173080 U CN201720173080 U CN 201720173080U CN 207265641 U CN207265641 U CN 207265641U
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- resistance
- household electrical
- circuit
- power
- electrical appliances
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- 238000009434 installation Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000010891 electric arc Methods 0.000 description 6
- 238000010892 electric spark Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012806 monitoring device Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a kind of excessive automatic power-off protection device of household electrical appliances resistance; a kind of excessive automatic power-off protection device of household electrical appliances resistance, which is mainly in the household electronic products circuit for needing to monitor or household electrical appliance connect the one in parallel big resistance R1 and control circuit auto-power-off device composition more much larger than primary circuit all-in resistance R2 in circuit.The control circuit auto-power-off device is connected using current transformer and with controlling switch; when electric current reaches particular value; coil in current transformer produces electric current; this electric current enters circuit auto-power-off device; device control circuit causes driving mechanism to act; circuit disconnects, so as to play a protective role.The utility model can be automatically powered off to resistance is excessive in household electrical appliances circuit, so as to protect household electrical appliance.
Description
Technical field
An electro-technical field is the utility model is related to, is specially automatic warning electricity more particularly, to the protection technique of household electrical appliances
The excessive protection technique field of resistance in road.
Background technology
Problems of the prior art and shortcoming：
In use, contact point is for a long time by hot and cold alternation, after usage time length for household electrical appliances such as electric heater all the time
Termination contact point contact is bad, causes connections terminal contact area to reduce, and contact resistance increase, forms hot-spot, draw
Play contact point and produce electric spark, electric arc or more serious fire accident.
The reason for causing accident mainly wire connection terminal contact area is reduced, contact resistance increase.
After household electrical appliance high-power use for a long time (such as electric heater), the wire connection terminal of product is because of oxidation, loose contact etc.
It is bad contact and cause contact resistance to increase.The passable area of section of electric current is reduced.(such as：Current flow be 13A, it is necessary to
The cross-sectional area of conducting wire is 1.5mm2, but the actually active cross-sectional area passed through is 1.0mm2Or smaller), and this value is in length
Also it can continue to reduce because of further aging in the use of phase.
By the calculation formula of resistance
(wherein R is resistance, and ρ is resistivity, and l is conductor length, and s is the cross section of conductor
Product) understand that the contact resistance of connector and tri- factors of ρ, l, s are related, under normal circumstances, the junction length l of connector
Ignore with electricalresistivityρ, therefore the contact resistance of connector and area s are inversely, i.e., area is smaller, and resistance R is bigger.
By Joule's law, it is known that
Q=I2RT
After resistance increase, caloric value increases (wherein Q is heat, and I is electric current, and R is resistance, and T is the time) therewith
Understand that caloric value and tri- factors of I, R, T of connector are related, and the caloric value in the unit interval only and I, R two because
It is known as pass.Since electric heater product operating current I itself is larger, after contact area diminishes, conductive contact resistance constantly increases,
Connector and neighbouring conductor overheating amount also increase therewith, and the increase of near joints heat influences conductive contact resistance again, constantly pernicious to follow
Ring.
When heat makes Wire temperature exceed certain value, electric wire rubber or plastic insulating layer will ignitions.It is if electric
Line " overcoat " damages, and can also cause short circuit, two lines is collided, so that phenomena such as triggering electric discharge and producing electric spark, electric arc.These
If electric spark, electric arc fall on flammable, combustibles, it is possible to cause electric heater spontaneous combustion, cause fire.
The applicable cases of the prior art are：(1) leakage protecting plug；This kind of plug can only protect product to have drain conditions,
Plug adstante febre could act power-off, not protect interiors of products connecting line contact point to send out electric spark, electric arc thermogenetic even
Phenomenon on fire.
(2) earth leakage circuit-breaker；Such switch can only protect household electrical appliance that the protection of drain conditions occurs, and not protect pair
In household electrical appliance because of the electric spark that loose contact causes resistance excessive and produces, electric arc phenomenon even on fire.
Although having in power grid using the detection of relay contacts resistance mode, such as entitled relay contacts resistance is online
Monitoring device (CN201520579714.2), openly (announce) number as CN204903718U, applying date 2015.08.04, public affairs
The patent application that (bulletin) day is 2015.12.23 is opened, it is related to a kind of relay contacts resistance on-Line Monitor Device.Including after
Electric appliance.It is to be connected by monitoring device by the cross beam frame set in it with relay；Feeler row on monitoring device base are equal
External direct current power supply is connected, the circuit of external direct current power supply is equipped with indicator light.When being monitored excessive to D.C. resistance, this
Device can show power transfer relay, and alarm.Can effective control relay service life, remind staff timely
Replace old relay；It can also directly reflect relay failure, facilitate fault discovery during accident treatment.Significantly improve
The Personal Safety of electric system livewire work personnel, substantially reduces the accident rate of livewire work.But for household electrical appliance
Detection someone does not expect in this way.
Utility model content
The purpose of this utility model provides one kind aiming at the deficiencies in the prior art, and the object of the present invention is to provide one
The excessive power-off protection apparatus of resistance in kind automatic alarm circuit.
In order to reach object above, the utility model patent adopts the following technical scheme that：
A kind of excessive automatic power-off protection device of household electrical appliances resistance, the device are mainly the household electronic products monitored in needs
In circuit or in the connection circuit of household electrical appliance circuit one in parallel than household electrical appliance circuit all-in resistance R2Much larger big resistance R1
Formed with control circuit auto-power-off device.
As a further illustration of the above scheme, the control circuit auto-power-off device using current transformer and with control
System switch connection, when electric current reaches particular value, the coil in current transformer produces electric current, this electric current enters circuit from dynamic circuit breaker
Electric installation, device control circuit cause driving mechanism to act (buckle releaser dropout), and circuit disconnects, so as to play a protective role.
The control circuit auto-power-off device can also use other manner, such as provide corresponding curent change signal
Household electrical appliances master controller is given, makes automatically powering off circuit open command and powered off by household electrical appliances master controller, is made so as to play protection
With.
Further, described device can be used as an element in parallel in household electrical appliance interiors of products circuit.
The device can also be used as an element in parallel between household electrical appliance connecting line.
The device can also be used as an element in parallel between household electrical appliance and socket.
The big resistance R in parallel1Than primary circuit all-in resistance R2It is 160-250 times big.
Compared with prior art, the excessive automatic power-off protection device tool of a kind of household electrical appliances resistance that the utility model patent provides
There is following beneficial effect：
The device main function be inside household electrical appliance or between household electrical appliance connecting line or household electrical appliance and socket it
Between auto-power-off device is installed, powered off in time before conducting wire or contact terminal produce electric spark, electric arc, it is possible to prevente effectively from because of line
Road aging, termination contact is bad and the fire incident that causes spontaneous combustion and trigger.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
The utility model patent is further described with reference to the accompanying drawings and embodiments.
As shown in Figure 1, a kind of excessive automatic power-off protection device of household electrical appliances resistance of the utility model, is filled by warning in parallel
It is R to put resistance1Formed with control circuit auto-power-off device, by taking electric heater as an example, it is assumed that electric heater all-in resistance is R2, and
The alarming device resistance of connection is R1, R1Much larger than R2, it is 100 times big, with the big resistance R in parallel1Than household electrical appliance primary circuit
All-in resistance R2Big 160-250 times is optimal, the resistance R of alarming device1Electric current very little that is bigger, flowing through, control circuit is from dynamic circuit breaker
Electric installation does not work.But after electric heater conducting wire is because of long-time service, aging circuit, resistance R2Gradually after increase, electricity is flowed through
Flow I1It will increase, after reaching certain value, current transformer because I in device1Electric current flow through, coil will produce electric current,
After this electric current enters control circuit auto-power-off device, control circuit causes driving mechanism to act (buckle releaser dropout), circuit
Disconnect, so as to play a protective role.
The device can be used as an element in parallel in household electrical appliance interiors of products circuit.
The device can also be used as an element in parallel between household electrical appliance connecting line.
The device can also be used as an element in parallel between household electrical appliance and socket.
Concrete operating principle is as follows：
As shown in the figure, under normal condition, R1Much larger than R2, by parallel-current formula
(I is total current)
Due to the resistance R of alarming device1Much larger than R2, so the resistance R of the alarming device flowed through1Electric current I1Very little,
Not up to the action current of the indicating mechanism of tape controller, alarming device do not work.
After long-time service, resistance R2Constantly increase, is learnt, the resistance R of the alarming device flowed through by current formula1Electric current
I1Will constantly it increase, after reaching certain value, current transformer because I in device1Electric current flow through, coil will produce electricity
Stream, after this electric current enters control circuit auto-power-off device, control circuit causes driving mechanism to act (buckle releaser dropout), line
Road disconnects, so as to play a protective role.
Above-described is only the preferred embodiment of the utility model, it is noted that the control circuit of the utility model
Auto-power-off device can also use other manner, and applicant does not enumerate herein, for the ordinary skill people of this area
For member, on the premise of not departing from the utility model and creating design, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.
Claims (2)
1. a kind of excessive automatic power-off protection device of household electrical appliances resistance, it is characterised in that the device is mainly the family monitored in needs
Parallel connection one is than household electrical appliance circuit all-in resistance R in electrical appliance circuit connecting wire road2Much larger big resistance R1With control circuit certainly
Dynamic circuit breaker electric installation forms, wherein, big resistance R1More than household electrical appliance circuit all-in resistance R2160-250 times.
2. the excessive automatic power-off protection device of household electrical appliances resistance according to claim 1, it is characterised in that the control circuit
Auto-power-off device is connected using current transformer and with controlling switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720173080.XU CN207265641U (en) | 2017-02-25 | 2017-02-25 | A kind of excessive automatic power-off protection device of household electrical appliances resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720173080.XU CN207265641U (en) | 2017-02-25 | 2017-02-25 | A kind of excessive automatic power-off protection device of household electrical appliances resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207265641U true CN207265641U (en) | 2018-04-20 |
Family
ID=61913937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720173080.XU Expired - Fee Related CN207265641U (en) | 2017-02-25 | 2017-02-25 | A kind of excessive automatic power-off protection device of household electrical appliances resistance |
Country Status (1)
| Country | Link |
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| CN (1) | CN207265641U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849004A (en) * | 2017-02-25 | 2017-06-13 | 广东万家乐燃气具有限公司 | A kind of excessive automatic power-off protection device of household electrical appliances resistance |
-
2017
- 2017-02-25 CN CN201720173080.XU patent/CN207265641U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849004A (en) * | 2017-02-25 | 2017-06-13 | 广东万家乐燃气具有限公司 | A kind of excessive automatic power-off protection device of household electrical appliances resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180420 |