CN2130287Y - Automatic protector for electric appliance - Google Patents
Automatic protector for electric appliance Download PDFInfo
- Publication number
- CN2130287Y CN2130287Y CN 92227770 CN92227770U CN2130287Y CN 2130287 Y CN2130287 Y CN 2130287Y CN 92227770 CN92227770 CN 92227770 CN 92227770 U CN92227770 U CN 92227770U CN 2130287 Y CN2130287 Y CN 2130287Y
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- CN
- China
- Prior art keywords
- voltage
- sheet metal
- contact
- electromagnet
- protector
- 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
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Abstract
The low-voltage damage and the high-voltage damage of a circuit device both have danger and universality, but at present, a low-voltage protector doesn't exist. The utility model aims to provide an automatic protector which can have a protective function for electrical equipment under low voltage and high voltage. The automatic protector is composed of a normally opened switch and a normally closed switch, wherein, the magnetic field force generated by an electric magnet and additional spring force control a contact point to break/close in order to control the two switches to break/close, and the turns of a coil on the electric magnet and the spring force are selected according to the designed lowest safe voltage and highest safe voltage. The utility model is utilized to protect the normal operation of the electric equipment in the designed voltage range.
Description
The utility model relates to a kind of automatic safety device of power consumption equipment; it can make power consumption equipment work in certain safe voltage scope; when being lower than certain design load or being higher than certain design load, voltage cuts off the power supply automatically; again can auto-closing in the safe voltage scope, with protection power consumption equipment operate as normal in the safe voltage scope.
At present, protector etc. is normally adopted in the protection of electric equipment, i.e. a series connection protector (fuse, fuse etc.) in circuit, when voltage is higher than a certain design safety voltage, the fuse fusing, the entire circuit interruption of power supply, electric equipment quits work.Behind the fuse that will more renew, just can rework.But when voltage was lower than certain design load, fuse can not melt, and circuit is power supply as usual, and is very unfavorable to electric equipment, might cause low pressure to damage.There is the stabilized voltage power supply of employing to protect in addition; it is in a certain value with stable operating voltage; become stabilized voltage power supply; but stabilized voltage power supply is not can reach certain design voltage value once starting, and will be through after a while preheating and stable, at this section in the period; the output voltage of stabilized voltage power supply always is lower than certain design load; if open power consumption equipment this moment, just cause electrical equipment under low pressure to damage easily, comprise stabilized voltage power supply.In fact this fault occurs repeatedly, causes any property loss.
Also electric equipment is not carried out at present the Special Equipment of low-voltage variation.
The purpose of this utility model is the protective device that a kind of electric equipment will be provided, and it has the function of high pressure and low-voltage variation simultaneously.
The purpose of this utility model is achieved in that and two switches is set, a normal open switch, a normally closed switch on a circuit.Switch is that electromagnet attracts sheet metal and contact to connect/come control.Specifically be that a circuit is disconnected, two contacts are set, the contact is corresponding with the end of electromagnet, is wound with coil on the electromagnet.The electromagnet two ends all have spring, have sheet metal on the spring.Below sheet metal is placed on the contact, and at regular intervals with the contact, constitute normal open switch; The sheet metal of the electromagnet other end is placed on below the contact, and with spring it is pressed on the contact, constitutes normally closed switch.Work as coil electricity, produce magnetic field, electromagnet produces suction, attracts sheet metal, sheet metal is connected with the contact or leaves ditch circuit passband or open circuit.Spring between sheet metal and the electromagnet is used for the recovery of sheet metal position.The number of turn of spring force and electromagnet coil designs according to designed safe voltage value.
Accompanying drawing is the principle schematic of automatic protector for electrical equipment.
Describe the concrete structure of the present utility model and the course of work below with reference to the accompanying drawings in detail.
Among the figure, 1-electromagnet, 2-coil, 3-contact, 4-sheet metal, 5-spring, 6-spring, 7-sheet metal, 8-contact, 9-electric equipment, 10-protector.
Two fractures are set on a circuit, two contacts are respectively arranged, the two ends of electromagnet (1) are corresponding with two fractures, are wound with coil (2) on it, electromagnet (1) two ends mounting spring (5,6), and the other end of spring (5,6) and sheet metal (4,7) connect.A sheet metal (7) is placed on below, contact (8), and the distance certain at interval with contact (8), constitutes normal open switch with spring (6); Another sheet metal (4) is placed on below the contact (3), with spring (5) it is pressed on the contact (3), constitutes normally closed switch with spring (5).Work as energized, coil produces magnetic field, and electromagnet produces suction.When supply voltage is lower than designed minimum safe voltage, the suction that electromagnet produces is not enough to overcome spring force, sheet metal this moment (7) still is not connected with contact (8), normal open switch still is in off-state, sheet metal (4) still is connected with contact (3), normally closed switch still is in closure state, and this moment, entire circuit did not have.When the supply voltage rising, when surpassing the minimum safe voltage of design, the magnetic field force that coil (2) produces increases, and overcomes the elastic force of spring (6), and with sheet metal (7) attraction, sheet metal (7) is connected with contact (8), and normal open switch is in closure state.In the time of in magnitude of voltage is in designed safe voltage scope, the magnetic field force that coil (2) produces is not enough to overcome the elastic force of spring (5) and sheet metal (4) is attracted to come, sheet metal (4) still is connected with contact (3), and normally closed switch still is in closure state, the entire circuit conducting.When voltage raises, when surpassing the highest safe voltage of design, the magnetic field force that coil produces attracts sheet metal greater than spring force, makes sheet metal (4) leave contact (3), and this moment, normally closed switch disconnected, the power consumption equipment outage.When supply voltage reduces, when being lower than the highest safe voltage of design, the magnetic field force that coil (2) produces is less than spring force, and spring (5) push up back sheet metal (4) on the contact (3) automatically, and circuit is communication automatically again.When voltage continues to reduce, when being lower than designed minimum safe magnitude of voltage, the magnetic field force of coil (2) is less than spring force, and from the contact (8), circuit disconnects spring force with sheet metal (7) top, and normal open switch is in off-state.So repeatedly, guaranteed that electric equipment (9) works in the safe voltage scope.Protector (10) is to be used for the coil high voltage protective, when avoiding voltage infinitely to raise with coil burnout.
Claims (1)
1, a kind of automatic protector for electrical equipment; form by a normal open switch and a normally closed switch; it is characterized in that; normal open switch is on two contact correspondence positions of circuit incision position electromagnet to be installed, and electromagnet is connected with sheet metal by spring, and sheet metal and contact are left; normally closed switch also is on two contact correspondence positions of circuit incision position electromagnet to be installed; electromagnet is connected with sheet metal by spring, and sheet metal contacts with the contact, and normal open switch and normally closed switch can be with electromagnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92227770 CN2130287Y (en) | 1992-07-20 | 1992-07-20 | Automatic protector for electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92227770 CN2130287Y (en) | 1992-07-20 | 1992-07-20 | Automatic protector for electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2130287Y true CN2130287Y (en) | 1993-04-21 |
Family
ID=33771635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92227770 Expired - Fee Related CN2130287Y (en) | 1992-07-20 | 1992-07-20 | Automatic protector for electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2130287Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730267A (en) * | 2013-12-05 | 2014-04-16 | 常熟市中凯仪表有限公司 | Valve limit switch |
| CN107514694A (en) * | 2017-09-01 | 2017-12-26 | 浙江水利水电学院 | Indoor apparatus of air conditioner Rouser on fire |
-
1992
- 1992-07-20 CN CN 92227770 patent/CN2130287Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730267A (en) * | 2013-12-05 | 2014-04-16 | 常熟市中凯仪表有限公司 | Valve limit switch |
| CN103730267B (en) * | 2013-12-05 | 2015-12-09 | 常熟市中凯仪表有限公司 | Valve limit switch |
| CN107514694A (en) * | 2017-09-01 | 2017-12-26 | 浙江水利水电学院 | Indoor apparatus of air conditioner Rouser on fire |
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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 |