CN206557323U - The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit - Google Patents
The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit Download PDFInfo
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- CN206557323U CN206557323U CN201720173074.4U CN201720173074U CN206557323U CN 206557323 U CN206557323 U CN 206557323U CN 201720173074 U CN201720173074 U CN 201720173074U CN 206557323 U CN206557323 U CN 206557323U
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Abstract
The utility model discloses the excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit, the device is mainly big resistance R1 and indicate indicator composition in parallel one big 200 times or so than primary circuit all-in resistance R2 in the household electronic products circuit for needing to monitor or in household electrical appliance connection line, the big resistance R1 and indicate indicator series connection.The indicate indicator is sound and/or light alarming device.The utility model can resistance be excessive in automatic alarm circuit, acousto-optic warning is carried out, so as to protect household electrical appliance.
Description
Technical field
The utility model is related to an electro-technical field, more particularly, to the protection technique of household electrical appliances, specially automatic warning electricity
The excessive acousto-optic warning technical field of resistance in road.
Background technology
Problems of the prior art and shortcoming：
In use, contact point is colded and heat succeed each other household electrical appliances such as electric heater for a long time all the time, after use time length
Termination contact point loose contact, causes connections terminal contact area to reduce, contact resistance increase, forms hot-spot, draws
Play contact point and produce electric spark, electric arc or more serious fire accident.
The reason for causing accident is mainly the reduction of binding post contact area, contact resistance increase.
After the long-term high-power use of household electrical appliance (such as electric heater), the binding post of product is because of oxidation, loose contact etc.
It is bad contact and cause contact resistance to increase.The area of section that electric current can pass through is reduced.(for example：Current flow be 13A, it is necessary to
The cross-sectional area of wire is 1.5mm2, but the actually active cross-sectional area passed through is 1.0mm2Or smaller), and this value is in length
It can also 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-sectional area of conductor) understands the contact electricity of joint
Resistance and tri- factors of ρ, l, s are relevant, and generally, the junction length l of joint and electricalresistivityρ ignore, therefore the contact of joint
With area s inversely, i.e., area is smaller, and resistance R is bigger for resistance.
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 the caloric value and tri- factors of I, R, T of joint are relevant, and caloric value in the unit interval only and I, R two because
Have pass.Because electric heater product operating current I itself is larger, after contact area diminishes, conductive contact resistance constantly increases,
Joint 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.If electric
Line " overcoat " is damaged, and can also be caused short circuit, two lines is collided, so as to trigger electric discharge and produce the phenomenons such as 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 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 to occur the protection of drain conditions, not protect pair
In household electrical appliance because of the electric spark that loose contact causes resistance excessive and produces, electric arc or even phenomenon on fire.
Although having in power network using the detection of relay contacts resistance mode, such as entitled relay contacts resistance is online
Monitoring device (CN201520579714.2), openly (announce) number be CN204903718U, the applying date be 2015.08.04, openly
(bulletin) day is 2015.12.23 patent application, and it is related to a kind of relay contacts resistance on-Line Monitor Device.Including relay
Device.It is to be connected by monitoring device by the cross beam frame set in it with relay；Feeler row on monitoring device base connect
External direct current power supply is connect, the loop of external direct current power supply is provided with indicator lamp.When being monitored excessive to D.C. resistance, this dress
Power transfer relay can be shown by putting, and be alarmed.Can effective control relay service life, remind staff in time more
Change old relay；Relay failure can also directly be reflected, facilitate fault discovery during accident treatment.Significantly improve electricity
The Personal Safety of Force system livewire work personnel, substantially reduces the accident rate of livewire work.But for household electrical appliance
Someone does not expect in this way for detection.
Utility model content
The purpose of this utility model provides one kind aiming at the deficiencies in the prior art, and it is an object of the invention to provide one
Plant the excessive alarming indicating device of resistance in energy automatic alarm circuit.
In order to reach object above, the utility model patent is adopted the following technical scheme that：
A kind of excessive device of resistance in sound and light alarm prompting household electrical appliances circuit, the device is mainly in the family expenses for needing to monitor
Big resistance in parallel one big more than 100 times than primary circuit all-in resistance R2 in electric equipment products circuit or in household electrical appliance connection line
R1 and indicate indicator composition, the big resistance R1 and indicate indicator series connection.
As a further illustration of the above scheme, the indicate indicator is sound and/or light alarming device.
Further, the device can be as an element in parallel in household electrical appliance interiors of products circuit.
The device can also be as an element in parallel between household electrical appliance connecting line.
The device can also be as an element in parallel between household electrical appliance and socket.
Compared with prior art, the excessive dress of resistance in a kind of sound and light alarm cue circuit that the utility model patent is provided
Put and have the advantages that：
The device main function be inside household electrical appliance or household electrical appliance connecting line between or household electrical appliance and socket it
Between alarming device is installed, user is notified in time before 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 circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is further described to the utility model patent.
As shown in figure 1, a kind of sound and light alarm of the present utility model points out the excessive device of resistance, the device in household electrical appliances circuit
An electricity more total than primary circuit in parallel mainly in the household electronic products circuit for needing to monitor or in household electrical appliance connection line
Indicating mechanism's composition of big more than 100 times (200 times or so are preferred, such as 160-250 times) the resistance R1 of R2 resistance and tape controller is hindered,
It is assumed that electric heater all-in resistance is R2, alarming device resistance in parallel is R1, and R1 is much larger than R2, and the resistance R1 of alarming device compares
Greatly, the electric current very little flowed through, alarming device does not work.But after electric heater wire is because of long-term use, aging circuit, resistance
After R2 gradually increases, flowing through electric current I1 and will increasing for alarming device is reached after certain value, master controller is with regard to that can receive I1 electricity
Signal is flowed, afterwards, then acousto-optic indicate indicator is sent from control panel sends the instruction notification of information to user to APP softwares simultaneously,
Notify producer handles the device can be as an element in parallel in household electrical appliance interiors of products circuit by user again.
The device can also be as an element in parallel between household electrical appliance connecting line.
The device can also be as an element in parallel between household electrical appliance and socket.
Concrete operating principle is as follows：
As illustrated, under normal condition, R1 is much larger than R2, by parallel-current formula
(I is total current)
So, the resistance R1 of alarming device is much larger than R2, so the resistance R1 of the alarming device flowed through electric current I1 very littles,
The not up to action current of the indicating mechanism of tape controller, alarming device does not work.
After long-term use, resistance R2 constantly increases, and is learnt by current formula, the resistance R1 electric currents of the alarming device flowed through
I1 will constantly increase, but after electric current I1 increases to the indicate indicator action current of alarming device, alarming device will be sent
Warning, notifies user, then handled accordingly by user.
Above-described is only preferred embodiment of the present utility model, it is noted that for the ordinary skill of this area
For personnel, on the premise of the utility model creation design is not departed from, various modifications and improvements can be made, these all belong to
In protection domain of the present utility model.
Claims (6)
1. a kind of excessive device of resistance in sound and light alarm prompting household electrical appliances circuit, its spy is in the device is mainly needing
In the household electronic products circuit of monitoring or in household electrical appliance connection line one bigger than primary circuit all-in resistance R2 100 times in parallel with
On big resistance R1 and indicate indicator composition, the big resistance R1 and indicate indicator series connection.
2. the excessive device of resistance in sound and light alarm prompting household electrical appliances circuit according to claim 1, it is characterised in that described
Indicate indicator is sound and/or light alarming device.
3. the excessive device of resistance in sound and light alarm prompting household electrical appliances circuit according to claim 1 or 2, it is characterised in that
The device can be as an element in parallel in household electrical appliance interiors of products circuit.
4. the excessive device of resistance in sound and light alarm prompting household electrical appliances circuit according to claim 1 or 2, it is characterised in that
The device can also be as an element in parallel between household electrical appliance connecting line.
5. the excessive device of resistance in sound and light alarm prompting household electrical appliances circuit according to claim 1 or 2, it is characterised in that
The device can also be as an element in parallel between household electrical appliance and socket.
6. the excessive device of resistance in sound and light alarm prompting household electrical appliances circuit according to claim 1 or 2, it is characterised in that
The big resistance R1 in parallel is bigger 160-250 times than primary circuit all-in resistance R2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720173074.4U CN206557323U (en) | 2017-02-25 | 2017-02-25 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720173074.4U CN206557323U (en) | 2017-02-25 | 2017-02-25 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206557323U true CN206557323U (en) | 2017-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720173074.4U Active CN206557323U (en) | 2017-02-25 | 2017-02-25 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771833A (en) * | 2017-02-25 | 2017-05-31 | 广东万家乐燃气具有限公司 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
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2017
- 2017-02-25 CN CN201720173074.4U patent/CN206557323U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771833A (en) * | 2017-02-25 | 2017-05-31 | 广东万家乐燃气具有限公司 | The excessive device of resistance in a kind of sound and light alarm prompting household electrical appliances circuit |
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