KR20240045523A - Electric fryer oil overheat prevention system - Google Patents

Abstract

Disclosed is a system for preventing oil overheating in an electric fryer. The present invention includes a temperature sensor that measures the temperature of the oil contained in the frying tank of an electric fryer, a heater that heats the oil, a power cutoff unit that controls the power supplied to the heater, and a supply of the heater to control the temperature of the oil. A main control unit including a relay that controls power, and controlling the power cut-off unit and the relay; and an overheating prevention unit that controls power supplied through the main control unit.

Description

Electric fryer oil overheat prevention system}

The present invention is an oil overheating prevention system for electric fryers that dually controls the power cutoff unit and relay with one temperature sensor and one overheating prevention unit to enhance safety against oil overheating and secure reliability by relatively simply preventing oil overheating. It's about.

The electric fryer consists of a frying tank with a heater installed at the bottom to heat oil, and a temperature controller is installed at the top of the frying tank to control the oil temperature in the frying tank by a temperature sensor attached to the heater. However, electric fryers have problems such as when a temperature sensor attached to the heater malfunctions, the oil temperature inside the fryer rises above the flash point temperature, causing a fire. Accordingly, in the case of commercial electric fryers, they are equipped with automatic temperature control safety devices such as bimetal switches and thermostats, and power cutoff devices such as SSR (Solid State Relay) elements that turn the power on/off in conjunction with these, and automatic switches. If oil overheating occurs during cooking, the automatic temperature control safety device detects this and activates the power cutoff device to cut off the main power of the electric fryer to protect the electric fryer from oil overheating. For example, regarding safety devices that prevent overheating of electric fryers, Korea Patent Publication No. 10-2013-0029515 proposes 'Safety devices to prevent overheating of electric fryers (Patent Document 1)', and Publication No. 10-2013-0007782 proposes ‘overheating prevention system for electric fryer and electric fryer using the same (patent document 2).’ However, the technology of existing patent document 1 has limitations in preventing oil overheating because the heater may continue to generate heat if the device for preventing oil overheating in an electric fryer does not operate normally due to malfunction, error, or failure, etc., and the existing patent The technology in Document 2 has a complicated configuration as it attaches a temperature sensor and a bimetal or cut-off switch to each switch unit, and even if the switch unit is turned off, the control unit cannot know this and there is no error display, which can cause confusion to consumers. .

Patent Document 1. Domestic Patent Publication No. 10-2013-0029515 (published on March 25, 2013) Patent Document 2. Domestic Patent Publication No. 10-2013-0007782 (published on January 21, 2013)

One of the technical problems to be solved by the present invention is to dually control the main power cutoff unit and relay with one temperature sensor and one overheating prevention device to stop all functions, including the display part of the product, when the overheating prevention device operates. The aim is to provide an oil overheating prevention system for electric fryers that enhances safety against oil overheating and ensures the operational reliability of electric fryers relatively simply.

The above objectives are, according to the present invention, a temperature sensor that measures the temperature of the oil contained in the frying tank of an electric fryer, a heater that heats the oil, a power cutoff unit that controls the power supplied to the heater, and a temperature sensor that controls the temperature of the oil. a main control unit that includes a relay that controls the power supply to the heater and controls the power cut-off unit and the relay; and an overheating prevention unit that controls the power supplied through the main control unit.

According to an embodiment of the present invention, the main control unit is configured to display the operating state of the electric fryer through the display unit, receive the user's external operation input signal through the key operation unit, and process the input signal, and set the oil temperature to the temperature. It may be configured to detect through a sensor and control the power supply to the heater according to the detected value.

According to an embodiment of the present invention, the overheating prevention unit is a thermal fuse that applies power to the main control unit before operation, and cuts off the power supply to the main control unit when oil is heated to the operating temperature of the overheating prevention unit. It can be configured.

According to an embodiment of the present invention, the overheating prevention unit applies power to the main control unit before operation, and when the oil is heated to the operating temperature of the overheating prevention unit, the NC (Normal Close) blocks the power supply to the main control unit. ) type bimetal switch.

According to an embodiment of the present invention, when there is no control signal from the main control unit, the contact point of the power cutoff unit and the relay is opened to cut off the power supplied to the heater, and when there is a control signal from the main control unit, the contact point is opened. It may be composed of a NO (Normal Open) type power relay that closes to supply power to the heater.

According to an embodiment of the present invention, when the temperature value of the oil detected by the temperature sensor reaches the cutoff temperature of the power cutoff unit, the main control unit opens the contact point of the power cutoff unit to cut off the power supplied to the heater. It can be configured to do so.

According to an embodiment of the present invention, the power cutoff temperature value of the power cutoff unit may be set to be lower than the operating temperature of the overheating prevention unit.

According to an embodiment of the present invention, when the main control unit is not in an error state and the temperature value of the temperature sensor is lower than the cutoff temperature set in the power cutoff unit, the main control unit inputs the power cutoff control signal to close the contact point of the power cutoff unit to turn on the heater. It may be configured to be controlled to supply power.

According to an embodiment of the present invention, when a malfunction occurs while using the electric fryer, the contact points of the relay and the power cut-off unit are opened to cut off the power supplied to the heater and an error message is displayed on the display unit that displays the fryer operation status. It can be configured to output.

According to an embodiment of the present invention, the power cut-off unit may be configured to control both ends of the power supply of the heater, and the relay may be configured to control the power supply of the heater installed at one end between the power cut-off unit and the heater.

In the present invention, in constructing an oil overheating prevention system for an electric fryer, the power cutoff unit and relay are always dually controlled through one temperature sensor and one overheating prevention unit, so that when the overheating prevention unit operates, all functions, including the display unit of the product. By controlling this to stop, there is an effect of strengthening the safety against oil overheating during operation of the electric fryer and securing the operation reliability of the electric fryer through the configuration of a relatively simple control system.

Figure 1 is an example showing an electric fryer.
Figure 2 is an example explaining the oil overheating prevention system of a conventional electric fryer.
Figure 3 is another example explaining the oil overheating prevention system of a conventional electric fryer.
Figure 4 is an example illustrating the oil overheating prevention system of an electric fryer according to an embodiment of the present invention, showing an example in which the heater is generating heat.

Hereinafter, the 'oil overheating prevention device for electric fryer' according to a preferred embodiment of the present invention will be described as follows.

Figure 1 is an example showing an electric fryer. As shown in Figure 1, the electric fryer 100 consists of a frying tank 101 installed at the bottom with a heater 120 capable of heating oil, and the frying tank 101 has a temperature sensor that detects the temperature of the oil. A sensor is installed and configured to control the oil temperature in the frying tank 101 according to the temperature detection value of the temperature sensor. However, if the temperature detection sensor attached to the heater 110 malfunctions, the frying tank 101 The internal oil temperature may rise above the flash point temperature, causing problems such as fire.

Accordingly, a system for preventing oil overheating in an electric fryer has been proposed, as shown in Figures 2 and 3.

Figure 2 is an example explaining the oil overheating prevention system of a conventional electric fryer. The oil overheating prevention system of the existing electric fryer as shown in Figure 2 includes a relay 140 that turns on/off the heater 120 according to a temperature sensor that detects the temperature of the oil in order to adjust the oil temperature to a set temperature. The temperature of the oil is controlled by the main control unit 150, which controls the. If the heater 120 continues to generate heat due to a failure of a part, etc. and the oil overheats, the bimetal of the overheating prevention unit 160 operates and the power cutoff unit ( 130) is turned off to cut off the power supplied to the main control unit 150 and the heater 120 to stop heat generation of the heater 120, but the bimetal of the overheating prevention unit 160, which prevents overheating, breaks down. If not in operation, the heater 120 may continue to generate heat, so it cannot perform its function of preventing oil overheating and causes a decrease in product reliability.

Figure 3 is another example explaining the oil overheating prevention system of a conventional electric fryer. In the oil overheating prevention system of the existing electric fryer as shown in Figure 3, the second switch unit (103b) turns on/off the heater supply power under the control of the PCB (105) according to the first temperature sensor (104a). When the oil is overheated, the bimetal switch 109 operates and a switching signal is input to the PCB 105, and the PCB 105 turns off the second switch unit 103b to block the power supply to the heater. In addition, the first switch unit (103a) also turns on/off the heater supply power under the control of the PCB (105) according to the temperature detection value of the second temperature sensor (104b), and when the oil is overheated, it responds to the signal of the Cutoff switch (106). It is turned off accordingly to cut off the power supply to the heater. Here, the unexplained code 107 is an earth leakage circuit breaker, and 108 is a power supply unit.

The oil overheating prevention system of the existing electric fryer, as shown in Figure 3, requires a temperature sensor in each switch unit, and is not only complicated in configuration by attaching a bimetal or cutoff switch, but also the PCB is not connected even when the first switch unit is turned off. Since it cannot be read or receive control signals, it is impossible to output an error display, which causes consumer misperception and confusion and adds to confusion in product operation.

Accordingly, in the present invention, a function to turn on/off the power cutoff unit according to the temperature of the oil is added to the main control unit that controls the relay that turns the heater on/off according to the temperature sensor that measures the temperature of the oil in the electric fryer. If the oil heats up to the power cutoff temperature before the overheating prevention unit operates, the main control unit turns off the power cutoff unit, cutting off the power supplied to the heater, stopping the heater from generating heat, and displaying an error on the fryer control unit. A fryer oil overheating prevention system is presented.

In addition, in the present invention, when the oil in the fryer is heated to the operating temperature set in the overheating prevention unit, the overheating prevention unit operates and the power supplied to the main control unit is cut off to stop all functions of the product, thereby enhancing the safety of the oil in the electric fryer. An overheating prevention system is presented.

The oil overheating prevention device for an electric fryer according to a preferred embodiment of the present invention will be described in more detail with reference to FIG. 4 as follows.

Figure 4 is an example illustrating the oil overheating prevention system of an electric fryer according to an embodiment of the present invention, showing an example in which the heater is generating heat.

As shown in Figure 4, the oil overheating prevention system of the electric fryer according to the present invention includes a temperature sensor 110 that measures the temperature of the oil contained in the frying tank of the electric fryer, a heater 120 that heats the oil, and the heater Overheating of the oil can be detected, including a power cutoff unit 130 that controls the power supply to (120) and a relay 140 that controls the power supply to the heater 120 to control the temperature of the oil. In this case, it may be configured to cut off the power supply to the heater 120.

And, it may be configured to include a main control unit 150 that controls the power cut-off unit 130 and the relay 140.

In addition, it may be configured to include an overheating prevention unit 160 that controls the power supplied through the main control unit 150.

In addition, the main control unit 150 displays the operating status of the electric fryer through the display unit 151, receives the user's external operation input signal through the key operation unit 152, processes the input signal, and controls the oil temperature of the fryer. It may be configured to detect through the temperature sensor 110 and control the power supply to the heater 120 according to the detected value.

Here, the main control unit 150 may include a key operation unit 152 for the user to select the electric fryer function and operation.

In addition, it may include a display unit 151 that displays the selection function of the key operation unit 152 and the current operating state.

In addition, according to the function selection of the key operation unit 152, a control signal is generated to the power cutoff unit 130 and the relay 140 to control the power supply to the heater 120, and the microcontroller that controls the operation of each unit A relay control unit that controls the heater to control the temperature of the processor and oil; and a power cutoff control unit that supplies power to the driving power of the heater 120 according to a control signal from the microprocessor.

In addition, the overheating prevention unit 160 applies power to the main control unit 150 before operation, and when the oil is heated to the operating temperature of the overheating prevention unit 160, the power supply applied to the main control unit 150 It may be configured to include a thermal fuse that blocks.

In addition, the overheating prevention unit 160 applies power to the main control unit 150 before operation, and when the oil is heated to the operating temperature of the overheating prevention unit 160, the power supply applied to the main control unit 150 It may be configured to include a normally closed (NC) type bimetal switch that blocks.

In addition, when there is no control signal from the main control unit 150, the contact point of the power cutoff unit 130 and the relay 140 is opened to block the power supplied to the heater 120, and the main control unit 150 It may be configured as a NO (Normal Open) type power relay that closes the contact when there is a control signal from to supply power to the heater 120.

In addition, the main control unit 150 opens the contact point of the power cut-off unit 130 when the temperature value of the oil detected by the temperature sensor 110 reaches the cut-off temperature of the power cut-off unit 130 to operate the heater. It may be configured to block the power supplied to (120).

Through this, the power supply to the relay 140 can be cut off based on the temperature value of the temperature sensor 110, so that the relay 140 can be controlled to have circuit safety even when it is broken, and the overheating prevention unit 160 Even in the event of a malfunction, the power to the heater can be permanently cut off. Accordingly, overheating of the oil in the electric fryer can be effectively prevented and enhanced safety can be provided compared to the previous electric fryer.

Additionally, the present invention may be configured by setting the power cutoff temperature value of the power cutoff unit 130 to be lower than the operating temperature of the overheating prevention unit 160.

Here, the power cutoff temperature of the power cutoff unit 130 can be set to a temperature that prevents deterioration and damage to internal components due to overheating of the oil, and the operating temperature of the overheating prevention unit 160 can be set to a temperature that prevents the temperature of the oil from causing a fire. It can be raised to an acceptable temperature or set to a temperature that can cause a fire due to co-heating without oil.

Through this, the power cut-off temperature of the power cut-off unit 160 is set lower than the operating temperature of the overheating prevention unit 60, thereby improving durability and ensuring safety by preventing deterioration and damage to internal components.

In addition, if a breakdown occurs in the fryer while using the electric fryer, the contact point of the relay 140 and the power cut-off unit 130 is opened to cut off the power supplied to the heater 120 and display the fryer operation status. It may be configured to output an error message on the display unit 151.

Through this, users can read and respond to oil overheating conditions or operating errors in real time while using the electric fryer, allowing them to use the fryer safely.

In addition, the power cut-off unit 130 controls both ends of the power supply to the heater 120, and the relay 140 is installed at one end between the power cut-off unit 130 and the heater 120. ) can be configured to control the power supply.

Meanwhile, the specific operation of the oil overheating prevention system of an electric fryer according to an embodiment of the present invention will be described with reference to FIG. 4 as follows.

Figure 4 is an example illustrating the oil overheating prevention system of an electric fryer according to an embodiment of the present invention, showing an example in which the heater is generating heat.

Supply power (AC 220V) is input and the user operates the product. The power supplied in this way is input to the main control unit 150 through the overheating prevention unit 160 (Nomal Close).

If the product is not in an error state and the temperature value of the temperature sensor 110 is lower than the cutoff temperature set in the power cutoff unit 130, the main control unit 150 inputs a control signal to the power cutoff unit 130 (Nomal Open). The contact point of the power cutoff unit 130 is closed to supply power to the heater 120.

And, if the temperature value of the temperature sensor 110 is lower than the set temperature, the relay control unit of the main control unit 150 inputs a control signal to the relay 140 (Nomal Open) to close the contact point of the relay 140 to open the heater 120. When supply power is supplied, the heater 120 generates heat, and if no signal is input from the relay control unit of the main control unit 150, the contact point of the relay 140 is opened and the power supply to the heater 120 is blocked, causing the heater 120 to generate heat. This stops.

In addition, the supplied power (AC 220V) is input to the main control unit 150 through the overheating prevention unit 160. Here, the overheating prevention unit 160 and the main control unit 150 are connected in series.

The main control unit 150 turns on/off the power supplied to the heater 120 according to the key operation unit 152 that inputs product operation and oil temperature settings, and the temperature sensor 110 that detects the oil temperature. The power cutoff unit 130 can be controlled.

In addition, the temperature of the oil is adjusted by controlling the relay 140 that turns on/off the power supplied to the heater 120 according to the temperature detection value of the key operation unit 152 and the temperature sensor 110.

The relay 140 and the power cutoff unit 130 are connected in series so that the power supply to the heater 120 is cut off when either one of the two turns off the power supply.

The overheating prevention unit 160 may be composed of a thermal fuse or a bimetal. Before the overheating prevention unit 160 operates, the supply power is applied, and when the oil in the electric fryer is heated to the operating temperature set in the overheating prevention unit 160, the supply power is turned on. Block.

Additionally, when the oil temperature is heated to the cut-off temperature set in the power cut-off unit 130 due to a failure of a part, etc., the main control unit 150 turns off the power cut-off unit 130 to block the power supplied to the heater 120. and displays an error through the display unit 151.

When the oil in the electric fryer is heated to the operating temperature set in the overheating prevention unit 160, the overheating prevention unit 160 operates and the power supplied to the main control unit 150 is cut off to stop all functions of the product.

In this way, the oil overheating prevention system of the electric fryer according to the present invention has one temperature sensor 110 and one overheating prevention unit 160, and the power cutoff unit 130 and relay 140 are always dually controlled to prevent overheating. When the prevention unit 160 operates, all functions, including the display unit 151, of the product are stopped, so that safety against oil overheating is strengthened and the operation reliability of the product can be relatively easily secured.

As described above, the present invention has been described with reference to an embodiment shown in the drawings, but is not limited to the embodiment and can be implemented with modifications and variations without departing from the gist of the present invention. This is included in the technical idea of the present invention.

110: temperature sensor 120: heater
130: Power cut-off unit 140: Relay
150: main control unit 151: display unit
152: key control unit 160: overheating prevention unit

Claims (10)

A temperature sensor that measures the temperature of the oil contained in the frying tank of an electric fryer, a heater that heats the oil, a power cutoff unit that controls the power supplied to the heater, and a power cutoff unit that controls the power supply to the heater to control the temperature of the oil. A main control unit including a relay and controlling the power cut-off unit and the relay; and an overheating prevention unit that controls the power supplied through the main control unit. According to claim 1,
The main control unit displays the operating status of the electric fryer through the display unit, receives the user's external operation input signal through the key control unit, and processes the input signal. The oil temperature is detected through the temperature sensor and the detected value is An oil overheating prevention system for an electric fryer, characterized in that it is configured to control the power supply to the heater according to. According to claim 1,
The overheating prevention unit applies power to the main control unit before operation, and a thermal fuse blocks the power supply to the main control unit when the oil is heated to the operating temperature of the overheating prevention unit. Oil overheating prevention system. According to claim 1,
The overheating prevention unit is comprised of an NC (normal close) type bimetal switch that applies power to the main control unit before operation and blocks the power supply to the main control unit when the oil is heated to the operating temperature of the overheating prevention unit. An oil overheating prevention system for an electric fryer. According to claim 1,
When there is no control signal from the main control unit, the power cut-off unit and the relay open a contact point to cut off the power supplied to the heater, and when there is a control signal from the main control unit, the contact point is closed to supply power to the heater. An oil overheating prevention system for an electric fryer, characterized in that it consists of a NO (Normal Open) type power relay that supplies power. According to claim 1,
The main control unit is configured to cut off the power supplied to the heater by opening the contact point of the power cutoff unit when the temperature value of the oil detected by the temperature sensor reaches the cutoff temperature of the power cutoff unit. oil overheating prevention system. According to claim 6,
An oil overheating prevention system for an electric fryer, characterized in that the power cutoff temperature value of the power cutoff portion is set lower than the operating temperature of the overheating prevention portion. According to claim 1,
If the main control unit is not in an error state and the temperature value of the temperature sensor is lower than the cutoff temperature set in the power cutoff unit, the main control unit is controlled to supply power to the heater by inputting the power cutoff control signal to close the contact point of the power cutoff unit. Oil overheating prevention system for electric fryers. According to claim 1,
When a malfunction occurs during use of the electric fryer, the relay and the power cut-off unit are opened to cut off the power supplied to the heater and output an error message to the display unit displaying the fryer operation status. Fryer oil overheating prevention system. According to claim 1,
The power cut-off unit controls both ends of the power supply to the heater, and the relay is configured to control the power supply to the heater installed at one end between the power cut-off unit and the heater.