WO2014063663A1

WO2014063663A1 - Overload and over-temperature early warning protection device having manual reset

Info

Publication number: WO2014063663A1
Application number: PCT/CN2013/089625
Authority: WO
Inventors: 马永红; 张宗宁
Original assignee: 东莞市凯恩电子科技有限公司
Priority date: 2012-10-25
Filing date: 2013-12-17
Publication date: 2014-05-01
Also published as: CN102931636A; CN102931636B

Abstract

An overload and over-temperature early warning protection device having a manual reset. The device comprises a temperature control unit (10) that provides an early warning when the load experiences over-temperature, a manual cut-off reset protection unit (20) that automatically cuts off the circuit of the load when the load experiences overload and over-temperature, and a step-down rectifier (30). The input end and the output end of the temperature control unit (10) are connected respectively to an alternating current source and the step-down rectifier (30). The input end and output end of the manual cut-off reset protection unit (20) are connected respectively to the alternating current source and the load. When an electric device experiences overload and over-temperature, the device of the present invention issues an early warning signal for checking and removing malfunctions in advance. The invention also ensures that the reset is only possible after the cause or malfunction for the circuit cut-off has been removed, and ensures the operational safety of the electric device.

Description

Manual reset overload over temperature warning protection device

[Technical Field]

The invention relates to an overload over-temperature protection device for an electric appliance, in particular to an overload over-temperature warning protection device for manual reset with both overload over-temperature warning and manual reset protection.

【Background technique】

A variety of electrical equipment is used in people's lives. When people use electrical equipment, they not only pay attention to the function of the equipment, but also pay more attention to the safety of the equipment. When a fault occurs in the components or electronic circuits of the electrical equipment, the equipment may be heated. When the temperature exceeds the normal value, the equipment may malfunction, which may affect the normal use of the equipment. To this end, general electrical or electronic devices are equipped with temperature switches or thermostats to disconnect the power supply when the temperature of the device exceeds normal values to protect the device. However, existing electrical or electronic equipment usually only has a single function temperature switch or temperature controller for overload and over temperature protection. Such devices cannot be known and eliminated in advance due to the absence of an early warning function and a manual power-off reset function. There are hidden troubles, and some devices have been automatically reset without clearing the hidden dangers, so there is a possibility of recurrence and potential safety hazards.

[Summary of the Invention]

The present invention aims to solve the above problems, and provides an overload over temperature warning protection that can provide an early warning signal for overloading and overheating of a powered device, so as to eliminate the fault point in advance, and manually reset the manual reset under the premise that the fault has been eliminated. Device.

In order to achieve the above object, the present invention provides a manual reset overload over-temperature warning protection device, which comprises a temperature control unit for early warning when the load is over-temperature, and a manual power-off reset protection for automatically disconnecting the load circuit when the load is overloaded and over-temperature. a unit and a buck rectifier unit, wherein an input end and an output end of the temperature control unit are respectively connected to an AC power supply and a buck rectifier unit, wherein the input end and the output end of the manual power-off reset protection unit are respectively connected to an AC power supply and The load is connected, and The temperature control unit emits an acoustic and light warning signal when the load exceeds the set temperature, and the warning is released when the load temperature returns to normal; the manual power-off reset protection unit automatically disconnects the load circuit when the load is overloaded, and the load circuit is disconnected. The manual power-off reset protection unit can be turned back on only by manually disconnecting the power supply.

The temperature control unit includes a temperature controller and a light emitting diode D2 connected to the step-down rectifying unit, a buzzer or a combination thereof.

The thermostat is a normally open thermostat with a temperature measurement range of 20 ° C to 150 ° C. Preferably, the temperature control unit is a snap-type thermostat, and the temperature measurement range is 20 ° C to 150 ° C.

The manual power-off reset protection unit comprises a base, a metal temperature sensitive sheet, a static contact, a movable contact, an insulating sheet, an electrical connecting piece, a PTC heating piece, a PTC fixing piece and a sleeve, wherein the metal temperature sensing piece One end is fixed to the inner side of the base, and the other end of the metal heat sensitive sheet is a free end. The movable end of the metal heat sensitive sheet is provided with a movable contact, and the electrical connecting piece is disposed on the upper part of the base, and the moving The corresponding part of the contact is provided with a static contact, and a PTC heating piece is arranged on the upper part of the electrical connection piece, the PTC heating piece is fixed by the PTC fixing piece, and the PTC fixed piece is connected with the base, the PTC fixed piece and the base are The electrical connecting pieces are separated by an insulating sheet, and the sleeve is sleeved on the outside of the base and the PTC fixing piece.

The base is a u-shaped metal trough body, and one end end thereof is provided with an electrical connection terminal extending outward. One end of the metal temperature sensitive sheet is fixed to the inner bottom of the base, and the upper end of the free end of the metal temperature sensitive sheet is provided with a movable contact.

One end of the electrical connecting piece is provided with an outwardly extending electrical connection terminal, and a static contact is provided on the lower side of the electrical connecting piece.

The step-down rectifying unit includes a step-down resistor R1 and a rectifying filter circuit composed of diodes D1 and D3 and a capacitor CI. The step-down resistor R1 is respectively connected to the temperature control unit and the rectifying and filtering circuit.

The metal temperature sensing piece is a nickel manganese metal piece, and the static contact and the moving contact are silver alloy contacts.

The contribution of the present invention is that it effectively solves the problem of overload over-temperature multiple protection of electrical equipment. Since the invention is provided with a temperature control unit and a manual power-off reset protection unit, the warning signal can be sent in real time when the power device is overloaded and over-temperature, so that the fault can be repaired in advance and the fault point can be eliminated. Simultaneously, Since it must be manually reset, it can be ensured that the cause of the disconnection of the circuit or the point of failure has been eliminated, and the above-mentioned double protection can effectively ensure the safe use of the electrical equipment. The invention can be widely applied to overload and over temperature protection of various household appliances and motors and the like.

[Description of the Drawings]

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing the entire structure of the present invention.

2 is a cross-sectional view showing the structure of a manual power-off reset protection unit of the present invention.

3 is an exploded perspective view showing the components of the manual power-off reset protection unit of the present invention.

Figure 4 is a circuit schematic of the present invention.

【detailed description】

The following examples are intended to further illustrate and illustrate the invention and are not to be construed as limiting.

Referring to Figure 1, the manual reset overload over temperature warning protection device of the present invention comprises a temperature control unit 10, a manual power-off reset protection unit 20 and a step-down rectifier unit 30.

In this embodiment, the temperature control unit 10 includes a temperature controller 11 and a light-emitting diode D2 and a buzzer connected to the step-down rectifying unit 30. The thermostat 11 is a normally open thermostat with a temperature measurement range of 20 ° C to 150 ° C. Preferably, the temperature control unit 10 is a snap-type thermostat with a temperature measurement range of 20 ° C to 150 ° C. As shown in FIG. 4, the input end of the temperature control unit 10 is connected to the power line of the AC power source, and the output end thereof is connected in series with the step-down resistor R1 of the buck rectifier unit 30. The light-emitting diode D2 is connected in series between the diodes D1 and D3 of the rectifying and filtering circuit 32. In the embodiment, the light-emitting diode D2 is an early warning light-emitting diode, and can be alarmed by a red-blue double-flash mode when warning. A buzzer can also be connected to the rectifying and filtering circuit 32 to perform an audible alarm at the same time as the flashing alarm, thereby realizing an over-temperature and sound alarm.

As shown in FIG. 1 to FIG. 3, the manual power-off reset protection unit 20 includes a base 21, a metal temperature sensitive sheet 22, a static contact 23, a movable contact 24, an insulating sheet 25, an electrical connecting piece 26, and a PTC heating. sheet 27. PTC fixing piece 28 and sleeve 29. As shown in FIG. 3, the base 21 is an open-shaped U-shaped metal groove-like body, and the bottom portion thereof protrudes outward to form an electrical connection piece receiving groove 212. One end of the base is provided with an outwardly extending electrical connection. The terminal 211, to which the power supply line 40 connected to the power source J1 is connected, is connected. The metal temperature sensing sheet 22 is a metal sheet which is expandable and deformable with a change in temperature. In the embodiment, the metal temperature sensing sheet 22 is an elliptical metal sheet made of a nickel manganese alloy. As shown in FIG. 2, one end of the metal temperature sensing sheet 22 is riveted and fixed in the electrical connecting piece receiving groove 212 of the base, and the other end of the metal temperature sensing piece is a free end, and the metal temperature sensing piece is upwardly curved in an arc shape, and The stationary contact 23 on the electrical connection piece 26 is in contact closure. A movable contact 24 is fixed to the upper side of the free end. The electrical connecting piece 26 is a metal sheet-like body, and is disposed on an upper portion of the base 21. The stationary contact 23 is riveted and fixed to a portion corresponding to the movable contact 24 on the lower side of the electrical connecting piece 26, and the static contact is fixed. 23 is closed by contact with the movable contact 24 through the insulating sheet 25. One end of the electrical connection piece 26 is provided with an outwardly extending electrical connection terminal 261 to which a power supply line connected to the load J2 is connected. In this embodiment, the static contact 23 and the movable contact 24 are silver alloy contacts. In Fig. 2, a PTC heating piece 27 is provided on the upper portion of the electrical connecting piece 26, and an upper portion of the PTC heating piece 27 is pressed and fixed by the PTC fixing piece 28. When the temperature or the load current exceeds the normal value, the metal temperature sensing sheet 22 induces a jump, so that the stationary contact 23 and the movable contact 24 are separated to cut off the power. At this time, a voltage is generated at both ends of the PTC heating element 27, and the generated heat keeps the metal temperature sensing sheet 22 from rebounding to maintain a continuous power-off action. As shown in FIG. 3, the PTC fixing piece 28 is a metal groove-shaped body having an opening downward corresponding to the shape of the base 21, and a top protrusion is provided at the top thereof for pressing the PTC heating piece 27. Both sides of the PTC fixing piece 28 are press-fitted to the outside of the electrical connection piece accommodating groove 212 of the susceptor to form an electrical connection. 2 and 3, the PTC fixing piece 28 and the base 21 and the electrical connecting piece 26 are separated by an insulating sheet 25. In this embodiment, the insulating sheet 25 is an insulating paper which is folded and fixed between the PTC fixing piece 28 and the base 21 and the electrical connecting piece 26 to provide insulation. A sleeve 29 is sleeved on the outside of the connected base 21 and the PTC fixing piece 28, and the sleeve is a nipple, which serves to insulate and protect the device.

As shown in FIG. 4, the buck rectifier unit 30 includes a step-down resistor R1 and a rectification filter circuit.

32. The step-down resistor R1 is used to reduce the voltage output by the temperature control unit 10, which is separately associated with the temperature control unit The element 10, the rectifying and filtering circuit 32, the light emitting diode D2, and the buzzer are connected in series. The rectifying and filtering circuit 32 is composed of diodes D1 and D3 and a capacitor CI for converting the alternating current outputted by the temperature control unit 10 and stepped down by the step-down resistor R1 into direct current.

The working principle of the present invention is as shown in FIG. 1. When the load J2 (which may be a motor or a household appliance) is working normally, the static contact 23 and the movable contact 24 are in a closed state, and the input end of the manual power-off reset protection unit 20 is The voltage between the output terminal and the output terminal is zero, and the PTC heater chip 27 is in an inoperative state. When the load reaches the set temperature due to overload or other reasons, the flashing warning signal is first sent out by the temperature control unit 10, or a buzzer sound is sounded by the buzzer (not shown). The movable contact 24 and the stationary contact 23 are immediately disconnected, and the PTC heating element 27 starts to generate heat under the action of the power supply voltage and maintains the metal temperature sensing sheet 22 at a constant temperature. Since the PTC heating element 27 is in a high resistance state, the load is applied. The circuit is equivalent to an open circuit, and the load stops working, thus providing safety protection. Even if the abnormal temperature has returned to normal, the metal temperature sensitive sheet 22 is still in the off state due to the heating of the PTC heating sheet 27, so as to prevent the movable contact 24 from closing with the stationary contact 23 before the failure has been eliminated, resulting in load damage. After the power is manually turned off and the fault is removed, the PTC heating element 27 returns to the normal temperature state, and the movable contact 24 and the stationary contact 23 can be closed, so that the manual power-off reset protection unit 20 is restored to conduction. In addition, at the moment when the movable contact 24 and the stationary contact 23 are disconnected, the load current can still form a loop through the PTC heating fin 27 to avoid arcing on the movable contact 24 of the metal heat sensitive sheet 22, thereby prolonging the metallic feeling. The life of the temperature film.

Thereby, the double protection of the temperature control unit 10 and the manual power-off reset protection unit 20 ensures that the device can be reset only when the fault has been completely eliminated, so as to effectively protect the safety of the power equipment.

Although the present invention has been disclosed by the above embodiments, the scope of the present invention is not limited thereto, and variations, substitutions, and the like of the above components will fall within the scope of the present invention. Within the scope of the claims.

Claims

Rights request

1. A manual reset overload over-temperature warning protection device, characterized in that the device comprises a temperature control unit (10) for early warning when the load is over-temperature, and a manual power-off reset for automatically disconnecting the load circuit when the load is overloaded and over-temperature a protection unit (20) and a step-down rectification unit (30), wherein an input end and an output end of the temperature control unit (10) are respectively connected to an AC power supply and a buck rectifier unit (30), and the manual power-off reset The input end and the output end of the protection unit (20) are respectively connected to an AC power source and a load, and

The temperature control unit (10) emits an acoustic and light warning signal when the load exceeds the set temperature, and the warning is released when the load temperature returns to normal; the manual power-off reset protection unit (20) automatically disconnects the load circuit when the load is overloaded and over-temperature After the load circuit is disconnected, the manual power-off reset protection unit (20) can be turned back on only by manually disconnecting the power supply.

2. The manual reset overload over temperature warning protection device according to claim 1, wherein the temperature control unit (10) comprises a temperature controller (11) and a light connection connected to the step-down rectifier unit (30) Diode D2, buzzer or a combination thereof.

3. The manual reset overload over temperature warning protection device according to claim 2, wherein the temperature controller (11) is a normally open type temperature controller, and the temperature measurement range is 20 ° C to 150 ° C.

The manual reset overload over-temperature warning protection device according to claim 3, wherein the temperature control unit (10) is a snap-type thermostat, and the temperature measurement range is 20 ° C to 150 ° C.

The manual reset overload over-temperature warning protection device according to claim 1, wherein the manual power-off reset protection unit (20) comprises a base (21), a metal temperature sensor (22), and a static a contact (23), a movable contact (24), an insulating sheet (25), an electrical connecting piece (26), a PTC heating piece (27), a PTC fixing piece (28), and a sleeve (29), wherein One end of the metal temperature sensing piece (22) is fixed on the inner side of the base (21), and the other end of the metal temperature sensing piece is a free end, and a movable contact (24) is provided at the free end of the metal temperature sensing piece, the electrical connection The piece (26) is disposed on an upper portion of the base (21), and a static contact (23) is disposed on a portion corresponding to the movable contact (24), and is disposed at an upper portion of the electrical connection piece (26) There is a PTC heating piece (27), the PTC heating piece (27) is fixed by a PTC fixing piece (28), and the PTC fixing piece (28) is connected to the base (21), the PTC fixing piece (28) and the base (21) Between the electrical connection piece (26) and the insulation piece (25), the sleeve (29) is placed outside the base (21) and the PTC fixing piece (28).

The manual reset overload over-temperature warning protection device according to claim 5, wherein the base (21) is a U-shaped metal groove-shaped body, and one end end thereof is provided with an outwardly extending electrical connection. Terminal (211).

7. The manual reset overload over-temperature warning protection device according to claim 5, wherein one end of the metal temperature sensing sheet (22) is fixed to the inner bottom of the base (21), and the metal temperature sensing sheet (22) The upper end of the free end is provided with a movable contact (24).

8. The manual reset overload over-temperature warning protection device according to claim 5, wherein one end of the electrical connection piece (26) is provided with an outwardly extending electrical connection terminal (261), in the electrical A static contact (23) is provided on the lower side of the connecting piece.

9. The manual reset overload over temperature warning protection device according to claim 1, wherein the buck rectifier unit (30) comprises a step-down resistor R1 and a diode D1, D3, a capacitor

A rectifying and filtering circuit (32) composed of C1, wherein the step-down resistor R1 is connected to the temperature control unit (10) and the rectifying filter circuit (32), respectively.

10. The manually reset overload over temperature warning protection device according to claim 7, wherein the metal temperature sensing sheet (22) is a nickel manganese alloy metal sheet, a static contact (23) and a movable contact ( 24) is a silver alloy contact.