CN2759011Y

CN2759011Y - Fire-proof damage-proof protection plug

Info

Publication number: CN2759011Y
Application number: CN 200420102348
Authority: CN
Inventors: 张显华
Original assignee: Baohua Electrical Appliances Factory Huangpu Shajing Baoan District Shenzhen
Current assignee: Baohua Electrical Appliances Factory Huangpu Shajing Baoan District Shenzhen
Priority date: 2004-12-02
Filing date: 2004-12-02
Publication date: 2006-02-15
Anticipated expiration: 2014-12-02

Abstract

The utility model relates to a fire-proof and damage-proof protection plug, which comprises an input loop 10 with pressure-sensitive protection, an output loop 20 with a shielding net, a control loop 30 for controlling a circuit breaker, and a circuit breaker loop 40 for controlling a power supply to switching on and switching off, wherein the input circuit 10 and the output circuit 20 are divided by the circuit breaker loop 40. The control loop 30 and the circuit breaker loop 40 are connected. A power supply instructing loop 60 is connected in parallel between an L and an N poles of the output loop 20. The control loop 30, the circuit breaker loop 40, a test loop 50, the input loop 10 and the output loop 20 are arranged on a main circuit board 31 in a casing 70. The power supply instructing loop is arranged on an indicating circuit board 61. An instructing circuit board is connected with the main circuit board 31 by a moving contact piece 42. When a power cord is damaged by external factors of firing, etc., the utility model can cut off the power supply in time, and has the advantages of sensitive response, safe work, etc.

Description

A kind of fire prevention loss prevention protection plug

Technical field

The utility model relates to the attaching plug of used for electric power connection, particularly relates to a kind of fire prevention loss prevention protection plug with flameproof protection function that is used for household electrical appliance.

Background technology

Using various household electrical appliance in people's life, all household electrical appliance all need power line to come to provide power supply for electrical equipment as refrigerator, electric cooker, electric chafing dish and air-conditioning etc., and by attaching plug power supply are connected with making electrical appliance.And the power line of existing electrical equipment generally all is exposed to outside the housing of electrical equipment, does not have special measure to be protected, and when power line is damaged because of external factor such as on fire, cuts off the electricity supply as untimely, will cause fire and personal injury accident.The existing power supply plug does not all possess the flameproof protection function.

Summary of the invention

The utility model is intended to address the above problem, and can in time cut off the electricity supply when power line is damaged because of external factor such as on fire and provide a kind of, and is quick on the draw, safe and reliable fire prevention loss prevention protection plug.

For achieving the above object, the utility model provides a kind of fire prevention loss prevention protection plug, and this fire prevention loss prevention protection plug comprises:

An input circuit 10 that has pressure-sensitive protection;

An output loop 20 that has gauze screen;

The control loop 30 of a control circuit breaker;

The circuit breaker loop 40 of a control on/off, wherein,

Input circuit 10 and output loop 20 are separated by circuit breaker loop 40, and control loop 30 is connected with circuit breaker loop 40, and power supply indication loop 60 is connected between the L and the N utmost point of output loop 20; Control loop 30, circuit breaker loop 40, test loop 50 and input circuit 10, output loop 20 all are arranged on the main circuit board 31 that is contained in the shell 70.

Input circuit 10 is by constituting with L inserted sheet 11, N inserted sheet 12 and G contact pin 13 that live wire L is connected with zero line N, and wherein L inserted sheet 11, N inserted sheet 12 directly are connected with wiring board 31, and with fixed contact 41 pressings in circuit breaker loop 40; Between live wire L and zero line N and be connected to a piezo-resistance MOV1; G contact pin 13 directly is connected with the G ground wire of output loop 20.

Output loop 20 is made of three core power lines 21, is provided with gauze screen 22 at its live wire L and zero line N outside, and this gauze screen is connected with control loop 30; The live wire L of power supply, zero line N are connected with two movable contacts 42 in circuit breaker loop 40 respectively.

Control loop 30 comprises by diode D1, D2, capacitor C 1, resistance R 2 and controllable silicon SCR 1 and two groups of control loops being made up of diode D3, D4, resistance R 3, capacitor C 2 and controllable silicon SCR 2, control loop one end is connected with the gauze screen of test loop (50) and out-put supply line 21 by resistance R 1, diode D5, and the other end links to each other with the coil L1 in circuit breaker loop 40.

Circuit breaker loop 40 is made up of switch SW 1, SW2 and SW3, switch SW 1, SW2, SW3 then are made up of the propelling coil 44 that opens circuit,

disjunction contact

41,42, the coil L1 in circuit breaker loop 40 is connected with control loop 30, the disjunction contact is located at the end of the

shell fragment

45,46 that is connected with main circuit board 31 and indication wiring board 61, the other end of

shell fragment

45,46 inserts in the holder 43, snap close 47 is housed on the holder, and switch SW 1, SW2 are connected with the N utmost point with the L of input, output loop respectively.Circuit breaker loop 40 also comprises a reset button 48 that makes switch SW 1, SW2 and SW3 have no progeny and reset at branch, and this reset button and holder 43 relatively are contained in the side of shell 70.

Fire prevention loss prevention protection plug also comprises a test loop 50 that detects the flameproof protection function; this test loop is made up of switch SW 4 and dropping resistor R5; wherein; switch SW 4 is made up of dropping resistor R5, test pieces 51, testing needle 52 and testing button 53; test pieces one end is connected with main circuit board 31; the other end places between testing needle 52 and the testing button 53; testing needle one end is fixed on the main circuit board; testing button and testing needle 52 relatively are contained in the side of shell 70, and test loop is connected with output loop with control loop 30.

Fire prevention loss prevention protection plug also comprises the power supply indication loop 60 of an indication on/off state, and this power supply indication loop is made up of dropping resistor R4, voltage-stabiliser tube D6 and luminous tube D7, and this loop is attempted by between the L and N the two poles of the earth of output loop 20; Power supply indication loop is located on the indication wiring board 61, and the indication wiring board is connected with main circuit board 31 by active contacting plate 42.

Shell 70 is by upper casing 72, lower casing 71 involutory being formed by connecting, and upper casing 72 is equipped with the water proof ring 73 that waterproofing protection is used with the junction of lower casing 71.

Good effect of the present utility model is that it efficiently solves the fire safety problem of attaching plug.Because the utility model is provided with the circuit such as control loop of the output loop 20, circuit breaker loop and the control circuit breaker that have gauze screen, thereby occur damaged at the power line that is exposed to the electrical equipment outside, when playing unsafe factor such as spark, can in time cut off electric current, take place to avoid fire and human casualty accident.

Description of drawings

Fig. 1 is the utility model exploded sketch.

Fig. 2 is the profile end view of Fig. 1.

Fig. 3 is circuit theory diagrams of the present utility model.

Embodiment

Consult Fig. 1～Fig. 3; fire prevention loss prevention protection plug of the present utility model comprises input circuit 10, output loop 20, control loop 30, circuit breaker loop 40, test loop 50, power supply indication loop 60 and shell 70; wherein, input circuit 10 and output loop 20 are separated (see figure 3) by circuit breaker loop 40.Described input circuit 10 is by constituting with L metal insert 11, N metal insert 12 and G metal ferrule 13 that live wire L is connected with zero line N, wherein an end of L inserted sheet 11, N inserted sheet 12 is directly fixed with wiring board 31 welding, and with fixed contact 41 pressings in circuit breaker loop 40.Between live wire L and zero line N and be connected to a piezo-resistance MOV1, be used for the instantaneous variation of offset supply voltage and isolate clutter.G contact pin 13 directly is connected with the G ground wire of output loop 20.Described output loop 20 constitutes (seeing Fig. 2, Fig. 3) by three core power lines 21, be provided with metallic shield net 22 at its live wire L and zero line N outside, this gauze screen is connected with control loop 30, is used for being subjected to unexpected or on fire and when damage at power line, by its trigger control circuit.The live wire L of power supply, zero line N are connected with two movable contacts 42 in circuit breaker loop 40 respectively.Described control loop 30 comprises two groups of control loops, form by diode D1, D2, capacitor C 1, resistance R 2 and controllable silicon SCR 1 for one group, another group is made up of diode D3, D4, resistance R 3, capacitor C 2 and controllable silicon SCR 2, wherein the phase place of controllable silicon SCR 1 and SCR2 is opposite, and they work to two half-waves of alternating current respectively.Control loop one end is connected with the gauze screen of test loop 50 and out-put supply line 21 by resistance R 1, diode D5, and the other end links to each other with the coil L1 in circuit breaker loop 40.Described circuit breaker loop 40 is by switch SW 1, SW2 and SW3 form, as shown in Figure 1, switch SW 1, SW2, SW3 is by the propelling coil 44 that opens circuit,

disjunction contact

41,42 form, wherein, the coil L1 in circuit breaker loop 40 is connected with control loop 30, the disjunction contact is located at

shell fragment

45,46 close end,

shell fragment

45,46 are connected with main circuit board 31 and indication wiring board 61 respectively,

shell fragment

45,46 the other end inserts in the holder 43, holder is connected in the lower casing 71 versatilely by its footing (not shown), and can move horizontally, the metal snap close 47 of the propelling coil effect of being opened circuit is equipped with propelling coil 44 opposite positions that open circuit in the holder side.Switch SW 1, SW2 are connected with the N utmost point with the L of input, output loop respectively.In order when switch SW 1, SW2 and SW3 are in the disjunction state it to be resetted, circuit breaker loop 40 also is provided with a reset button 48, and this reset button and holder 43 relatively are contained in the side of shell 70, and its end is connected with holder 43.For the flameproof protection function that can understand this plug before use operate as normal whether; the utility model also is provided with a test loop 50 that detects the flameproof protection function; this test loop is made up of switch SW 4 and dropping resistor R5; wherein; switch SW 4 is by dropping resistor R5; test pieces 51; testing needle 52 and testing button 53 are formed; test pieces 51 is metal clipss; the one end is connected with main circuit board 31; the other end places between testing needle 52 and the testing button 53; testing needle one end is fixed on the main circuit board; testing button and testing needle 52 relatively are contained in the side of shell 70, and test loop is connected with the gauze screen 22 of control loop 30 and output loop 20.When pressing testing button, be equivalent to produce discharge to gauze screen 22, thereby the SCR1 of trigger control circuit 30 or SCR2 disconnect switch SW 1, SW2 and the SW3 of broken circuit by the L utmost point.This fire safety protection plug also is provided with the power supply indication loop 60 of an indication on/off state, and this power supply indication loop is made up of dropping resistor R4, voltage-stabiliser tube D6 and luminous tube D7, and this loop is attempted by between the L and N the two poles of the earth of output loop 20.

Circuit of the present utility model and member all are arranged in the plastic casing 70, and the usefulness screw is involutory is formed by connecting by upper casing 72, lower casing 71 for shell, and upper casing 72 is equipped with water proof ring 73 with the junction of lower casing 71, has the waterproof action of anti-rain grade.

Operation principle of the present utility model as shown in Figure 3, this flame-proof plug inserted supply socket after, when pressing reset button 48, the switch SW 1 in the broken circuit, SW2 and SW3 connect, output loop 20 normally uses electrical equipment to electric power supply.

When power line is subjected to unexpected or on fire and when damage, spark appears between the L of power line 21 or the N utmost point and its gauze screen 22, this moment, the control loop 30 that is connected with gauze screen 22 promptly can trigger controllable silicon SCR 1 or SCR2 conducting (control loop that the phase place that controllable silicon SCR 1 and SCR2 are constituted is opposite is respectively two half-waves of alternating current to be worked respectively), thereby cause the iron core of the coil 44 in the broken circuit 40 to produce porpoise, impact snap close 47 and reset button 46 is unclamped, switch SW 1, therefore SW2 and SW3 all disconnect, and have therefore guaranteed the fail safe that electrical equipment uses.

Claims

1, a kind of fire prevention loss prevention protection plug is characterized in that it comprises:

An input circuit (10) that has pressure-sensitive protection;

An output loop (20) that has gauze screen;

The control loop (30) of a control circuit breaker;

The circuit breaker loop (40) of a control on/off, wherein,

Input circuit (10) and output loop (20) are separated by circuit breaker loop (40), and control loop (30) is connected with circuit breaker loop (40), and power supply indication loop (60) is connected between the L and the N utmost point of output loop (20); Control loop (30), circuit breaker loop (40), test loop (50) and input circuit (10), output loop (20) all are arranged on the main circuit board (31) that is contained in the shell (70).

2, fire prevention loss prevention protection plug according to claim 1, it is characterized in that, described input circuit (10) is made of the L inserted sheet (11) that is connected with zero line N with live wire L, N inserted sheet (12) and G contact pin (13), wherein L inserted sheet (11), N inserted sheet (12) directly are connected with wiring board (31), and with fixed contact (41) pressing of circuit breaker loop (40); Between live wire L and zero line N and be connected to a piezo-resistance MOV1; G contact pin (13) directly is connected with the G ground wire of output loop (20).

3, according to the described fire prevention loss prevention protection of claim plug, it is characterized in that described output loop (20) is made of three core power lines (21), be provided with gauze screen (22) at its live wire L and zero line N outside, this gauze screen is connected with control loop (30); The live wire L of power supply, zero line N are connected with two movable contacts (42) of circuit breaker loop (40) respectively.

4, according to the described fire prevention loss prevention protection of claim plug; it is characterized in that; described control loop (30) comprises by diode D1, D2, capacitor C 1, resistance R 2 and controllable silicon SCR 1 and two groups of control loops being made up of diode D3, D4, resistance R 3, capacitor C 2 and controllable silicon SCR 2; control loop one end is connected with the gauze screen of test loop (50) and out-put supply line (21) by resistance R 1, diode D5, and the other end links to each other with the coil L1 of circuit breaker loop (40).

5; fire prevention loss prevention protection plug according to claim 1; it is characterized in that; described circuit breaker loop (40) is by switch SW 1; SW2 and SW3 form; switch SW 1; SW2; SW3 is then by the propelling coil that opens circuit (44); disjunction contact (41); (42) form; the coil L1 in circuit breaker loop (40) is connected with control loop (30); the disjunction contact is located at the shell fragment (45) that is connected with main circuit board (31) and indication wiring board (61); (46) end; shell fragment (45); (46) the other end inserts in the holder (43); snap close (47) is housed, switch SW 1 on the holder; SW2 respectively with input; the L of output loop is connected with the N utmost point.

6; fire prevention loss prevention protection plug according to claim 1; it is characterized in that; it also comprises a test loop (50) that detects the flameproof protection function; this test loop is made up of switch SW 4 and dropping resistor R5; wherein; switch SW 4 is by dropping resistor R5; test pieces (51); testing needle (52) and testing button (53) are formed; test pieces one end is connected with main circuit board (31); the other end places between testing needle (52) and the testing button (53); testing needle one end is fixed on the main circuit board; testing button and testing needle (52) relatively are contained in the side of shell (70), and test loop is connected with output loop (20) with control loop (30).

7, fire prevention loss prevention protection plug according to claim 1, it is characterized in that, it also comprises the power supply indication loop (60) of an indication on/off state, this power supply indication loop is made up of dropping resistor R4, voltage-stabiliser tube D6 and luminous tube D7, and this loop is attempted by between the L and N the two poles of the earth of output loop (20); Power supply indication loop is located on the indication wiring board (61), and the indication wiring board is connected with main circuit board (31) by active contacting plate (42).

8, fire prevention loss prevention protection plug according to claim 1 is characterized in that, described shell (70) is by upper casing (72), involutory being formed by connecting of lower casing (71), and upper casing (72) is equipped with the water proof ring (73) that waterproofing protection is used with the junction of lower casing (71).

9, fire prevention loss prevention protection plug according to claim 5; it is characterized in that; described circuit breaker loop (40) also comprises a reset button (48) that makes switch SW 1, SW2 and SW3 have no progeny and reset at branch, and this reset button and holder (43) relatively are contained in the side of shell (70).