CN201562950U

CN201562950U - Leakage protection device of electric water heater

Info

Publication number: CN201562950U
Application number: CN2009202415795U
Authority: CN
Inventors: 欧永源
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-11-27
Filing date: 2009-11-27
Publication date: 2010-08-25
Anticipated expiration: 2019-11-27

Abstract

The utility model relates to a leakage protection device of an electric water heater, which comprises a first electromagnetic induction coil, an amplifier, a relay and a linked switch, wherein the first electromagnetic induction coil is sheathed on a phase line and a zero line; the amplifier receives and amplifies leakage induction signals output by the first electromagnetic induction coil; the relay receives the signals output by the amplifier; and the linked switch which is controlled by the relay controls the disconnection and conduction of the phase line and the zero line; the leakage protection device is characterized by also comprising a second electromagnetic induction coil sheathed on a ground line; the output end of the second electromagnetic induction coil is connected with the input end of the amplifier; the linked switch is a three-phase switch, and controls the disconnection and conduction of the ground line, the phase line and the zero line respectively; the outputs of the three ends of the three-phase switch are the output ends of the phase line and the zero line and the output end of the ground line; the outer ends of the phase line and the zero line are connected with two ends of a heater of the electric water heater; and the output end of the ground line is connected with the grounding end. The phase line, the zero line and the ground line can all cut off power at once when in leakage, thus being safe and reliable in use.

Description

The earth leakage protective device of electric heater

Technical field:

The utility model relates to a kind of earth leakage protective device of electric heater.

Background technology

Electric heater belongs to the I electric appliances, and the metallic conduction parts that human body easily contacts must link to each other with earth connection and constitute ground protection, and such security of products depends on the ground connection reliability.In China, because historical reasons, a lot of building grounding systems are not good, that have or even shortage, as wrong line or aging circuit or private pull the wire occur fitting up or use the combined socket and switch of poor quality or water pipe to work as earth connection etc., all might cause ground wire electrification, thereby cause the electric shock accidents that causes because of the environment electric leakage.Also have when earth connection can not reliable ground, will directly cause the human electric shock as if ground wire electrification.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art and earth leakage protective device that a kind of a kind of electric heater that all can cut off the electricity supply at once when electric leakage appears in phase line, zero line and ground wire is provided.

In order to achieve the above object, the utility model is to realize like this, it is a kind of earth leakage protective device of electric heater, comprise first electromagnetic induction coil that is set on phase line and the zero line, receive the leakage inductance induction signal of first electromagnetic induction coil output and the amplifier that amplifies, the relay of the signal of reception amplifier output and disconnect linked switch with conducting by the control phase line of relay control and zero line; It is characterized in that: also comprise second electromagnetic induction coil that is set on the ground wire, the output of second electromagnetic induction coil links to each other with amplifier input terminal, described linked switch is a threephase switch, it controls the disconnection and the conducting of ground wire and phase line and zero line respectively, the three ends output of threephase switch is respectively the output of phase line and zero line and the output of ground wire, the two ends of the heating element of the output termination electric heater of phase line and zero line, the output termination earth terminal of ground wire.The diode that plays buffer action that also comprises the output that is located at second electromagnetic induction coil.

The utility model advantage compared with prior art is, all can cut off the electricity supply at once when electric leakage appears in phase line, zero line and ground wire, and is safe in utilization, reliable.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model linked switch adhesive;

Fig. 2 is the utility model linked switch dead circuit schematic diagram.

Embodiment

Below in conjunction with drawings and Examples the utility model is done further detailed description:

As shown in Figure 1, 2, it is a kind of earth leakage protective device of electric heater, comprise first electromagnetic induction coil 1 that is set on phase line 3 and the zero line 4, receive the leakage inductance induction signal of first electromagnetic induction coil output and the amplifier 7 that amplifies, the relay 8 of the signal of reception amplifier output and disconnect linked switch 12 with conducting by the control phase line of relay control and zero line; During use, when leaky appears in phase line 2 and zero line 3, first electromagnetic induction coil 1 can be sensed electric leakage signal and it is defeated by amplifier 7 amplify rear drive relay 8, relay energized linked switch 12, phase line 3 and zero line 4 disconnect, and the effect of safeguard protection has been played in the electric heater outage; Characteristics of the present utility model are: also comprise second electromagnetic induction coil 1 that is set on the ground wire 2, the output of second electromagnetic induction coil links to each other with the input of amplifier 7, linked switch 12 is a threephase switch, it controls the disconnection and the conducting of ground wire and phase line and zero line respectively, the three ends output of threephase switch is respectively the output 10,9 of phase line and zero line and the output 11 of ground wire, the two ends of the heating element of the output termination electric heater of phase line and zero line, the output termination earth terminal of ground wire; During use, when leaky appears in ground wire, second induction coil 6 can be sensed electric leakage signal and it is defeated by amplifier 7 amplify rear drive relay 8; relay energized linked switch 12; phase line 3, zero line 4 and ground wire 2 disconnect, and the effect of safeguard protection has been played in the electric heater outage.

In the present embodiment, the diode 5 that plays buffer action that also comprises the output that is located at second electromagnetic induction coil 1.

Claims

1. the earth leakage protective device of an electric heater, comprise first electromagnetic induction coil that is set on phase line and the zero line, receive the leakage inductance induction signal of first electromagnetic induction coil output and the amplifier that amplifies, the relay of the signal of reception amplifier output and disconnect linked switch with conducting by the control phase line of relay control and zero line; It is characterized in that: also comprise second electromagnetic induction coil (1) that is set on the ground wire (2), the output of second electromagnetic induction coil links to each other with the input of amplifier (7), described linked switch (12) is a threephase switch, it controls the disconnection and the conducting of ground wire and phase line and zero line respectively, the three ends output of threephase switch is respectively the output (11) of output (10), (9) and the ground wire of phase line and zero line, the two ends of the heating element of the output termination electric heater of phase line and zero line, the output termination earth terminal of ground wire.

2. the earth leakage protective device of electric heater according to claim 1 is characterized in that: the diode (5) that plays buffer action that also comprises the output that is located at second electromagnetic induction coil (1).