Concave induction cooker capable of accurately controlling temperature

Abstract

The utility model relates to the technical field of cooking electric appliances, and provides an accurate temperature control concave induction cooker which comprises a cooker body used for placing a cooking container, and a heating piece and a photoelectric detector are arranged on the cooker body; the heating element and the photoelectric detector are both positioned below the cooking container; the heating element is used for heating the cooking container, and the cooking container emits thermal infrared light transmitted to the photoelectric detector in the heating process, so that a non-contact temperature measurement structure is formed between the photoelectric detector and the cooking container. Based on the characteristic of non-contact photoelectric temperature measurement of a special photoelectric detector, the temperature can be measured through a microcrystalline plate to control the heating power, and the induction cooker capable of accurately controlling the temperature is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of cooking electric appliances, concretely relates to a concave electromagnetic oven of accurate temperature control, based on the characteristic of non-contact photoelectric temperature measurement of special photoelectric detector, and can measure temperature through microcrystalline plate to control heating power, realize a kind of accurate temperature control electromagnetic oven. BACKGROUND

[0002] Photoelectric detector is a kind of light signal of specific wavelength (near infrared) can be converted into electrical signal, it works based on photoelectric characteristic, can convert the near infrared light emitted by object into electrical signal, and then convert into the temperature of measured object. Its characteristic lies in that near infrared light can penetrate microcrystalline glass, does not need to contact object to measure temperature, by measuring the part of infrared light that penetrates microcrystalline plate, can be measured through microcrystalline glass, non-contact temperature measurement.

[0003] Based on the temperature measurement principle of photoelectric detector, it has the advantages of simple structure, fast response, high reliability and the like, can directly receive the light energy of measured object, reduces the temperature transmission link, and can quickly respond to the temperature of pot above microcrystalline glass plate.

[0004] At present, the concave spherical electromagnetic oven on the market, because the microcrystalline plate is concave spherical, if the bottom of the pot contacts the microcrystalline plate, it is easy to cause the concave microcrystalline plate to break in the process of stir-frying;If the bottom of the pot does not contact the microcrystalline plate, there is an air layer in the middle, which affects the temperature transmission of the pot to the microcrystalline plate. Accurate temperature control becomes a technical difficulty, but as people's living standards continue to improve, people's demand for cooking is also getting higher and higher. The temperature sensor of traditional concave electromagnetic oven usually adopts NTC temperature sensor, which is packaged by ceramic or glass. When measuring the temperature of microcrystalline glass plate, the concave electromagnetic oven microcrystalline plate cannot be tightly attached to the pot, and the air gap increases the temperature measurement deviation. With the extension of use time, the heat-conducting silicone grease on the NTC temperature sensor becomes dry, which leads to worse temperature measurement effect. When cooking hot oil, the oil temperature is too high, and a large amount of oil smoke is volatilized;When frying food, the food is often burned due to over-temperature, which causes certain harm to human body. UTILITY MODEL CONTENTS

[0005] The utility model provides a concave electromagnetic oven of accurate temperature control, specifically a concave spherical electromagnetic oven of non-contact measurement pot temperature, adopts photoelectric detector to directly penetrate microcrystalline plate, measures the temperature of cooking container above microcrystalline glass plate, improves the response speed of temperature measurement, and further improves the temperature control precision of cooking container, to meet the demand of people's living standard improvement.

[0006] A concave electromagnetic oven of accurate temperature control designed for this purpose, comprising a furnace body for placing a cooking container, a heating element and a photoelectric detector are arranged on the furnace body;

[0007] The heat generating member and the photoelectric detector are both located below the cooking container.

[0008] The heat generating member is used for heating the cooking container, and the cooking container emits heat infrared light during the heating process, which is transmitted to the photoelectric detector, so that a non-contact temperature measurement structure is formed between the photoelectric detector and the cooking container.

[0009] The oven body is provided with an operation unit for processing the electric signal output by the photoelectric detector, and the operation unit is electrically connected with the photoelectric detector, so that the photoelectric detector converts the received heat infrared light into an electric signal and transmits it to the operation unit for processing.

[0010] The oven body is provided with a control circuit board, and the operation unit and the heat generating member are both electrically connected with the control circuit board, so that the corresponding electric elements on the control circuit board receive the electric signal of the operation unit and adjust the heating power and / or heating time of the heat generating member.

[0011] The operation unit includes an amplification circuit module for amplifying the electric signal and an analog-to-digital converter (ADC) module for converting the analog signal into a digital signal for processing by a digital system, and the amplification circuit module and the ADC module are independently arranged.

[0012] Alternatively, the amplification circuit module and the ADC module are integrally arranged in the interior of the first chip.

[0013] The oven body is provided with a microcrystalline plate for placing and supporting the cooking container, the photoelectric detector is located below the microcrystalline plate, and the heat generating member is located on the electromagnetic coil heating body acting on the microcrystalline plate.

[0014] The microcrystalline plate and the probe of the photoelectric detector have a light transmission member, and the heat generated during the heating process of the cooking container is transmitted through the microcrystalline plate and along the light transmission member to the photoelectric detector.

[0015] Alternatively, the probe side of the photoelectric detector is provided with a reflecting member, and the heat generated during the heating process of the cooking container is transmitted through the microcrystalline plate and reflected to the photoelectric detector through the reflecting member.

[0016] The light transmission member is provided with a light guide hole, and the heat generating member is provided with a avoiding opening corresponding to the light transmission member, the light transmission member is inserted into the avoiding opening of the heat generating member and abuts on the bottom of the microcrystalline plate.

[0017] The bottom of the cooking container is arc-shaped, and the microcrystalline plate is provided with a concave arc surface corresponding to the arc-shaped bottom of the cooking container.

[0018] The photoelectric detector is provided with an electromagnetic shielding structure for reducing electromagnetic interference on the measured signal.

[0019] The photoelectric detector is packaged in the electromagnetic shielding structure.

[0020] The electromagnetic shielding structure comprises an upper metal shielding shell and a lower metal shielding shell, and an electromagnetic shielding cavity for packaging the photodetector is formed between the upper metal shielding shell and the lower metal shielding shell, and an operation unit electrically connected with the photodetector is arranged on the electromagnetic shielding cavity.

[0021] The heating element is provided with an NTC temperature sensor.

[0022] The utility model discloses the beneficial technical effects are as follows:

[0023] The photodetector installed below the microcrystalline glass plate carries out non-contact temperature measurement, and the photodetector can directly sense the heating temperature of the cooking container above the microcrystalline glass plate, converts the hot infrared light emitted by the cooking container into an electric signal, and after the electric signal is processed through the operation unit, the operation unit transmits the signal to the control circuit board of the induction cooker, and after the corresponding electric appliance element of the control circuit board receives the electric signal, the heating power and the heating time of the electromagnetic coil heating body are controlled, so that the cooking container is finally maintained in the set interval and relatively kept stable. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further explained in detail in connection with the drawings and specific embodiment.

[0025] Figure 1 It is a structural diagram of the NTC temperature sensor provided in the electromagnetic coil heating body in the prior art.

[0026] Figure 2 It is a structural diagram of the light-transmitting piece and the photodetector cooperation of the first embodiment of the utility model.

[0027] Figure 3 It is a structural diagram of the light-transmitting piece and the photodetector cooperation of the first embodiment of the utility model. Figure 2 It is an enlarged view of position A in the middle.

[0028] Figure 4 It is a structural diagram of the light-transmitting piece and the photodetector cooperation of the first embodiment of the utility model.

[0029] Figure 5 It is a structural diagram of the light-transmitting piece and the photodetector cooperation of the first embodiment of the utility model. Figure 4 It is an enlarged view of position B in the middle.

[0030] Figure 6 It is a structural diagram of the operation unit integrated in the same chip inside the first embodiment of the utility model.

[0031] Figure 7 It is a structural diagram of the photodetector encapsulated in the electromagnetic shielding structure of the first embodiment of the utility model. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. In order to make the above purposes, characteristics and advantages of the present application more obvious and easy to understand, many specific details are described in the following description so as to be fully understood. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] First embodiment:

[0034] Referring to Figures 1-3 With Figure 7 A concave electromagnetic oven with precise temperature control, comprising an oven body 1 for placing a cooking container 2, wherein a heating element 6 and a photoelectric detector 3 are arranged on the oven body 1.

[0035] The heating element 6 and the photoelectric detector 3 are both located below the cooking container 2.

[0036] The heating element 6 is used to heat the cooking container 2, and the cooking container 2 emits heat infrared light during the heating process, which is transmitted to the photoelectric detector 3, so as to form a non-contact temperature measurement structure between the photoelectric detector 3 and the cooking container 2.

[0037] The photoelectric detector 3 has photoelectric properties and can perform non-contact temperature measurement. It can quickly detect the infrared energy radiated by the heating object above the microcrystalline plate 7, avoid the heat conduction temperature measurement link between objects, and quickly measure the temperature of the space object (microcrystalline plate), thereby achieving precise control of the cooking temperature.

[0038] An operation unit 4 for processing the output electrical signal of the photoelectric detector 3 is arranged in the oven body 1. The operation unit 4 is electrically connected with the photoelectric detector 3, so that the photoelectric detector 3 converts the received heat infrared light into an electrical signal and transmits it to the operation unit 4 for processing.

[0039] A control circuit board 5 is arranged in the oven body 1. The operation unit 4 and the heating element 6 are both electrically connected with the control circuit board 5, so that the corresponding electrical elements on the control circuit board 5 receive the electrical signal of the operation unit 4 and adjust the heating power and / or heating time of the heating element 6.

[0040] The operation unit 4 comprises an amplification circuit module for amplifying the electrical signal, and an analog-to-digital converter (ADC) module for converting the analog signal into a digital signal for processing by a digital system. The amplification circuit module and the ADC module are independently arranged.

[0041] The operation unit 4 performs operation amplification on the electrical signal measured by the photoelectric detector 3 and converts the analog signal into a digital signal (A / D), and transmits the digital signal to the control circuit board 5, and the single-chip microcomputer of the control circuit board 5 receives the signal and outputs a corresponding electrical signal to the heating element 6, so as to adjust the heating power and heating time of the heating element 6.

[0042] The furnace body 1 is provided with a microcrystalline plate 7 for placing and supporting a cooking container 2, the photoelectric detector 3 is located below the microcrystalline plate 7, and the heating element 6 is located on the electromagnetic coil heating body acting on the microcrystalline plate 7;

[0043] The microcrystalline plate 7 and the probe of the photoelectric detector 3 are provided with a light transmission member 8, and the heat generated during the heating process of the cooking container 2 is transmitted to the photoelectric detector 3 through the microcrystalline plate 7 and the light transmission member 8, without the need to open holes on the microcrystalline glass of the electromagnetic oven, and without damaging the appearance of the electromagnetic oven.

[0044] The light transmission member 8 is provided with a light guide hole, and the heating element 6 is provided with a avoiding opening corresponding to the light transmission member 8, the light transmission member 8 is inserted into the avoiding opening of the heating element 6 and abuts on the bottom of the microcrystalline plate 7.

[0045] The bottom of the cooking container 2 is arc-shaped, and the microcrystalline plate 7 is provided with a concave arc surface 14 corresponding to the arc-shaped bottom of the cooking container 2.

[0046] The photoelectric detector 3 is provided with an electromagnetic shielding structure 10 on the outside for reducing electromagnetic interference of the measured signal;

[0047] The photoelectric detector 3 is packaged in the electromagnetic shielding structure 10, so as to avoid electromagnetic interference of the measurement result of the detector when the electromagnetic oven is heated.

[0048] The electromagnetic shielding structure 10 includes an upper metal shielding shell 11 and a lower metal shielding shell 12, and an electromagnetic shielding cavity 13 for packaging the photoelectric detector 3 is formed between the upper metal shielding shell 11 and the lower metal shielding shell 12, and the operation unit 4 electrically connected with the photoelectric detector 3 is arranged on the electromagnetic shielding cavity 13.

[0049] In the embodiment, the upper metal shielding shell 11 and the lower metal shielding shell 12 are fixedly connected by buckling each other, or the upper metal shielding shell 11 and the lower metal shielding shell 12 are fixedly connected by locking screws.

[0050] In the embodiment, the upper metal shielding shell 11 is provided with the light transmission member 8.

[0051] The heating element 6 is provided with an NTC temperature sensor 15. In order to solve the temperature drift of the photoelectric detector 3, the NTC temperature sensor 15 is needed to be placed for temperature drift compensation.

[0052] In order to improve reliability, the NTC sensor 15 can be selectively added on the electromagnetic coil heating body to realize mutual failure calibration of the NTC sensor 15 and the photoelectric detector 3. When the temperature is stable, if the temperature value measured by the NTC temperature sensor 15 deviates from the temperature value measured by the photoelectric temperature sensor by more than a certain limit value, it can be determined that one of the sensors fails, and the heating is stopped to ensure the reliability of the whole machine.

[0053] The cooking container 2 is placed above the microcrystalline plate 7, the heating element 6 below the microcrystalline plate 7 performs high-frequency electromagnetic heating on the cooking container 2, the heat radiation of the cooking container 2 passes through the microcrystalline plate 7, the light-transmitting element 8 between the photoelectric detector 3 and the microcrystalline plate 7 is light-transmitting, the light-transmitting element 8 is provided with a cylindrical hole, the cylindrical hole passes through the opening position of the heating element 6, the cylindrical hole is tightly attached to the lower side of the microcrystalline plate 7, and the photoelectric detector 3 is placed below the microcrystalline plate 7 and can sense the slight change of temperature, which is converted into voltage level; the metal shielding layer of the electromagnetic shielding structure 10 is installed below the coil disc base, the coil disc base is used for fixing the heating element 6, the metal shielding layer of the electromagnetic shielding structure 10 can avoid the interference of high-frequency electromagnetic waves on the photoelectric detector 3 and the operation unit 4, and the metal shielding shell is placed below the operation unit 4 to form a non-contact temperature sensor.

[0054] The non-contact temperature sensor converts the temperature change of the cooking container 2 into voltage level signal and transmits it to the operation unit 4 for signal amplification and AD conversion, in combination with the on-board temperature sensor (NTC sensor 15), the temperature drift compensation is performed on the photoelectric detector 3, the corrected temperature is transmitted to the control circuit board 5 of the electromagnetic oven, the control circuit board 5 controls the heating coil disc according to the measured temperature, and the size of the heating power and the heating time are controlled to realize precise temperature control during cooking.

[0055] The cooking container 2 is a magnetically conductive metal.

[0056] Second embodiment:

[0057] Referring to Figure 4 , Figure 5 , a concave electromagnetic oven for precise temperature control is different from the first embodiment in that the probe side of the photoelectric detector 3 is provided with a reflecting element 9, and the heat radiation generated during the heating process of the cooking container 2 passes through the microcrystalline plate 7 and is reflected to the photoelectric detector 3 through the reflecting element 9.

[0058] The non-contact temperature sensor receives the heat infrared light source reflected by the reflecting mirror (reflecting element 9) to reduce the interference of heat radiation on the photoelectric detector 3, and the other parts are the same as those of the first embodiment, and the description is omitted.

[0059] The reflecting element 9 can be arranged in the electromagnetic shielding cavity 13 in the first embodiment.

[0060] Third embodiment:

[0061] Referring to Figure 6 The amplifier circuit module and the analog-to-digital converter (ADC) module of the operation unit 4 are integrally arranged in the interior of the first chip, the first chip is arranged on the control circuit board 5, and the first chip is electrically connected with the control circuit board 5. At present, the integration degree of the MCU chip is high, and the operation and A / D conversion can be realized in the interior of the MCU chip. Therefore, the operation unit 4 can be integrated in the interior of the MCU chip of the control circuit board 5.

[0062] The above only is the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A concave electromagnetic oven with precise temperature control, comprising an oven body (1) for placing a cooking container (2), characterized in that: The furnace body (1) is provided with a heating element (6) and a photoelectric detector (3); The heating element (6) and the photoelectric detector (3) are both located below the cooking container (2); The heating element (6) is used for heating the cooking container (2), and the cooking container (2) emits heat infrared light during the heating process, which is transmitted to the photoelectric detector (3), so that a non-contact temperature measurement structure is formed between the photoelectric detector (3) and the cooking container (2).

2. The concave induction cooker with precise temperature control according to claim 1, characterized in that: The furnace body (1) is provided with an operation unit (4) for processing the electric signal output by the photoelectric detector (3), and the operation unit (4) is electrically connected with the photoelectric detector (3), so that the photoelectric detector (3) converts the received heat infrared light into an electric signal and transmits it to the operation unit (4) for processing.

3. The concave induction cooker with precise temperature control according to claim 2, characterized in that: The furnace body (1) is provided with a control circuit board (5), and the operation unit (4) and the heating element (6) are both electrically connected with the control circuit board (5), so that the corresponding electric elements on the control circuit board (5) receive the electric signal of the operation unit (4) and adjust the heating power and / or heating time of the heating element (6).

4. The concave induction cooker with precise temperature control according to claim 2, characterized in that: The operation unit (4) includes an amplification circuit module for amplifying the electric signal and an analog-to-digital converter (ADC) module for converting the analog signal into a digital signal for digital system processing, and the amplification circuit module and the analog-to-digital converter (ADC) module are independently arranged. Alternatively, the amplification circuit module and the analog-to-digital converter (ADC) module are integrally arranged in the first chip.

5. The concave induction cooker with precise temperature control according to claim 1, characterized in that: The furnace body (1) is provided with a microcrystalline plate (7) for placing and supporting the cooking container (2), the photoelectric detector (3) is located below the microcrystalline plate (7), and the heating element (6) is located on the electromagnetic coil heating body acting on the microcrystalline plate (7); The microcrystalline plate (7) and the probe of the photoelectric detector (3) have a light transmission element (8), and the heat generated during the heating process of the cooking container (2) is transmitted to the photoelectric detector (3) through the microcrystalline plate (7) and the light transmission element (8); Alternatively, the probe side of the photoelectric detector (3) is provided with a reflecting element (9), and the heat generated during the heating process of the cooking container (2) is reflected to the photoelectric detector (3) through the reflecting element (9) after being transmitted through the microcrystalline plate (7).

6. The concave induction cooker with precise temperature control according to claim 5, characterized in that: The light transmission element (8) is provided with a light guide hole, and the heating element (6) is provided with a avoiding opening corresponding to the light transmission element (8), the light transmission element (8) is inserted into the avoiding opening of the heating element (6) and abuts on the bottom of the microcrystalline plate (7).

7. The concave induction cooker with precise temperature control according to claim 5, characterized in that: The bottom of the cooking container (2) is arc-shaped, and the microcrystalline plate (7) is provided with a concave arc surface (14) corresponding to the arc-shaped bottom of the cooking container (2).

8. The concave induction cooker with precise temperature control according to claim 1, characterized in that: The photoelectric detector (3) is provided with an electromagnetic shielding structure (10) on the outside for reducing electromagnetic interference on the measured signal; The photoelectric detector (3) is packaged in the electromagnetic shielding structure (10).

9. The concave induction cooker with precise temperature control according to claim 8, characterized in that: The electromagnetic shielding structure (10) includes an upper metal shielding shell (11) and a lower metal shielding shell (12), and an electromagnetic shielding cavity (13) for packaging the photoelectric detector (3) is formed between the upper metal shielding shell (11) and the lower metal shielding shell (12), and the operation unit (4) is electrically connected with the photoelectric detector (3) on the electromagnetic shielding cavity (13).

10. The concave induction cooker with precise temperature control according to claim 1, characterized in that: The heating element (6) is provided with an NTC temperature sensor (15).

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