JPH1132923A - Electric fryer - Google Patents

Abstract

(57) [Summary] [Problem] If it is not possible to stop energization of a heater due to a failure such as welding of a contact of an energization control element that controls energization of a heater for heating, the power supply of a fryer is turned off before oil smoke and ignition occur. Obtain an electric fryer that improves the safety of stopping and stopping power supply to the heater. A current transformer (3) for detecting a current flowing to a heater (5) is provided to control an energized state.
When the current flowing to the heater 5 is detected even though the energization control element drive signal is not output from the control device 7, the control device 7 determines that the energization control element 4 is faulty. After the alarm device 9 is sounded for a certain period of time, the electric leakage breaker 2 is driven and cut off from the main power supply of the fryer to prevent the oil temperature from excessively rising.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an electric fryer used in a commercial kitchen.

[0002]

2. Description of the Related Art In a fryer, when the power supply to the heater cannot be stopped due to a failure such as welding at the contact of the power supply control element, the power supply is stopped without leaving the contact even if the power supply control element is stopped by the control device. There is no means, and the power is turned off at the user's discretion to stop energization.

Further, when a sensor is provided in the oil tank and the oil temperature becomes higher than a certain temperature, the user is informed of danger by a notification means such as a buzzer.

[0004]

In the prior art, when the user is not at the side of the fryer, the heater cannot be turned off, and as a result, the oil temperature continues to rise and the fire caused by the smoke and ignition of the oil may occur. Could be reached.

Accordingly, an object of the present invention is to realize a method of stopping the energization of the fryer before the smoke and ignition of the oil even when the user is away from the fryer.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a current transformer for detecting a current flowing to a heater so that a control device can grasp an energized state. Things.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention detects a current flowing through two phases of a three-phase power supply and a current-carrying control element for controlling power supply to a heater in an oil tank, a leakage breaker for cutting off the power supply of a fryer, and a three-phase power supply. A current transformer and a control device having a microcomputer for controlling the entire product are provided, and when the current flowing to the heater is detected even though the energization control element drive signal is not output from the control device, the energization control element is controlled. The control device determines that a failure has occurred, sounds the alarm device for a certain period of time, and then drives the earth leakage breaker to turn off the main power supply of the fryer to prevent the oil temperature from rising excessively.

[0008] By doing so, it is possible to prevent smoke and ignition before the user is near the fryer or without visually judging the overheating state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 1 is a structural view of an electric fryer according to an embodiment. The heating heater 5 is submerged in the oil tank 11 so that an appropriate amount of oil can be filled therein. An operation panel 8 is disposed on the front of the cabinet 10.
A temperature setting switch, an oil temperature display lamp, and the like are provided.

FIG. 2 shows a control circuit block diagram of the present embodiment. In FIG. 2, reference numeral 1 denotes a commercial power supply, to which an energization control element 4 is connected via an earth leakage breaker 2. The energization control element 4 controls energization of the heater 5.
Reference numeral 3 denotes a current transformer for detecting a current flowing through two phases of the three-phase power supply. The detected input current is detected by a current detection circuit 6. Reference numeral 7 denotes a control device for controlling the entire product, which has a microcomputer. Reference numeral 8 denotes the operation panel, which constitutes a display device. Reference numeral 9 denotes a notification device for notifying by a buzzer, sound, or the like when a failure occurs.

The operation of the control circuit block diagram of FIG. 2 will be described below. The input current detected by the current transformer 3 is detected by the current detection circuit 6. This detected value is input to the control device 7. The energization control element 4 is turned on and off by a signal output from the control device 7. When the energization control device is turned on, an electric current flows through the heater 5 to heat the oil in the oil tank 11. The earth leakage breaker 2 shuts off the entire power supply according to a signal output from the control device 7 that has detected an abnormality based on the detected value.

Hereinafter, the operation of the control device 7 until the energization control element 4 is determined to have failed will be described with reference to the flowchart of FIG. First, it is determined whether or not the energization control element drive signal is being output. If it is not being driven, if the detection value detected by the current detection circuit 6 is equal to or more than a certain numerical value, it is determined that the energization control element 4 is faulty and the notification device 9 sounds. . Next, a signal for driving the earth leakage breaker 2 is output from the control device 7 to stop the entire fryer.

[0014]

According to the present invention, even if the power supply control device breaks down and the heater continues to supply power, the power supply can be stopped before the oil smokes and ignites, and a fire can be prevented.

[Brief description of the drawings]

FIG. 1 is a structural diagram of an electric fryer according to an embodiment of the present invention.

FIG. 2 is a block diagram of the control circuit.

FIG. 3 is a flowchart up to the failure determination.

[Explanation of symbols]

 2 earth leakage breaker 3 current transformer 4 conduction control element 5 heating heater 6 current detection circuit 7 control device 9 notification device 11 oil tank

Claims (2)

[Claims] 1. A power supply control element for controlling power supply to a heater in an oil tank, an earth leakage breaker for shutting off a power supply, a current transformer for detecting a current flowing in two phases of a three-phase power supply, and an entire product. If a control device with a microcomputer to control is provided, and if a current is detected by the current transformer signal even though a signal for driving the conduction control element is not output from the control device, it is regarded as a failure of the conduction control element, An electric fryer, which outputs a signal for driving a circuit breaker from a control device and stops energization. 2. The system according to claim 1, wherein before driving the earth leakage breaker, an alarm device such as a buzzer provided in the control device is sounded for a certain period of time to notify a user of danger, and then the energization is stopped. Electric fryer.