JPH03291885A - Heating apparatus - Google Patents

Abstract

PURPOSE:To inform even a small electric leakage prior to the operation of a leakage breaker, and to allow an user to take an earlier countermeasure, by detecting a leakage current flowing through an earthing wire, and generating an alarm if a leakage current is generated, in a heating apparatus furnishing an earthing terminal such as a cooking heater connecting to a commercial power supply. CONSTITUTION:A power supply side earthing wire 2a is provided to a power supply cord 2, and a box body side earthing wire 7 is provided to a box body 6. When an electric leakage is generated, a leakage current flows through the earthing wire 2a even though it is a minute leakage owing to an insulator deterioration with the passage of time, and a voltage is generated at the secondary side of a power supply transformer 8, a current flows through the primary side, and the leakage current is to flow in the earthing wire 2a. Consequently, it is detected by a controller 5, and when it exceeds a specific value, it is decided that an electric leakage is generated, and a leakage alarm 9 is operated to inform the user.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heating appliance such as a shoe heater that is connected to a commercial power source and has a ground terminal.

[Prior Art] As a conventional heating appliance of this type, there is one shown in FIG. Fig. 2 is a block diagram showing the configuration of a conventional Kiraking heater. 3> is a heat generating unit, (4) is a thyristor, (5)
is the control unit that controls the whole, (6) is the housing of the heating appliance, and (7
> is the case side grounding wire connected to the case.

Next, the operation will be explained. The control unit (5) controls the thyristor (4) with the electric power taken in from the commercial power source (1) to perform appropriate power control while supplying electricity to the heat generating unit (3) to generate the desired amount of heat. It generates a lot of heat and is used as a heating device such as a shoe heater.

In addition, the power supply cord (2) is provided with a power supply side grounding wire (2a), and the case (6) is provided with a case side grounding wire (7), so that in case of an electrical leakage, a grounding wire (2a) is provided. Safety is ensured by surveying the route.

[Problems to be Solved by the Invention] Conventional heating appliances such as those described above are configured as described above, so when used at home, for example, until an earth leakage breaker that is far away from the heating appliance operates. Therefore, if a leak occurs due to insulation deterioration over time, by the time the earth leakage breaker is activated and the leak is noticed, the equipment is already in a state where it is impossible to repair or recover. The problem was that there was fear.

This invention was made to solve this problem, and it warns the user of a small electrical leakage when a small electrical leakage occurs.
The aim is to obtain a heating appliance that can prompt the user to make repairs.

[Means for Solving the Problems] A heating appliance according to the present invention includes a detection means for detecting a leakage current flowing through a grounding wire, and a warning means for issuing a warning when a leakage current is detected by the detection means. That is.

[Function] The heating appliance according to the present invention can alert the user to a leakage current when it detects a leakage current flowing through the grounding wire, so the user cannot notice a slight leakage before the earth leakage breaker operates. It becomes possible.

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which (1) is a commercial power source, (2) is a power cord, and (2a) is a commercial power source.
is the power supply side ground wire inside the power cord (2), (3) is the heating unit, (4) is the thyristor, (5) is the control unit that controls the whole, (6) is the housing of the heating appliance, (7) is a case side grounding wire connected to the case, (8) is a current transformer, and (9) is an earth leakage alarm.

Next, the operation will be explained. The operation of generating heat with a desired amount of heat from the heat generating unit (3) and using it as a heating appliance such as a shoe heater is the same as that of a conventional device, and its explanation will be omitted here. As with conventional devices, the power cord (2) is provided with a power supply side grounding wire (2a), while the casing (6) is provided with a casing side grounding wire (7), which prevents electrical leakage. Then, even if it is a minute leakage due to insulation deterioration over time, for example, a leakage current flows through the power supply side grounding wire (2a). When current flows through the power supply side ground wire (2a), voltage is generated on the secondary side of the power transformer (8), current flows through the primary side of the power transformer (8), and the power supply side ground wire (2a) The controller (5) is notified that a leakage current has flowed.

If the current value from the power transformer (8) exceeds a predetermined value, the control unit (5) determines that a current leakage has occurred and activates the current leakage alarm (9), which alerts the user to the current leakage. Warn you that there is.

Since the predetermined value set in the control section 5) can be selected appropriately, the user can be warned of this when a slight leakage occurs that would prevent the earth leakage breaker from operating, so that the user can use it as soon as possible. It is possible to have the person take measures such as repairs.

In the above embodiment, a current transformer (8) is used as a detection means for detecting leakage current, and a leakage alarm (9) is used as a warning means for issuing a warning, but the detection means and warning means are limited to the above embodiment. It is not something that will be done.

Further, a detection means may be provided on the case side grounding wire (7).

[Effects of the Invention] As explained above, this invention detects the leakage current flowing through the grounding wire and issues a warning to the user, so the user is notified of a slight leakage before the earth leakage breaker operates. This has the effect of allowing measures such as repairs to be taken early.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional heating appliance. In the figure, (1) is a commercial power supply, (2) is a power cord, (
2a) is the power supply side grounding wire, (3) is the heating unit, (4)
is the thyristor, (5) is the control unit, (6) is the housing, (7)
indicates the case side grounding wire, (8) indicates the current transformer, and (9) indicates the earth leakage alarm. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] In a heating appliance that is connected to a commercial power supply having a grounding terminal and causes a leakage current to flow through a grounding wire when a leakage occurs, a detection means for detecting a leakage current flowing through the grounding wire; A heating appliance characterized by comprising a warning means for issuing a warning when leakage current is detected.