Device and method for calibrating temperature of baking electric oven

Abstract

The invention provides a device and a method for calibrating the temperature of an electric baking oven. The device comprises a temperature probe and a calibration controller, the calibration controller is in two-way communication connection with the temperature probe and the oven electric control device; the calibration controller comprises a temperature measurement circuit which is integrated in the calibration controller. The temperature measuring circuit is connected with the temperature probe; the oven electric control device comprises an oven controller, a temperature sensor, a heating element and an external memory; the oven controller is in two-way communication connection with the calibration controller, the temperature sensor, the heating element and the external memory; according to the device and the method for calibrating the temperature of the baking electric oven, the structure of the calibration device can be simplified, so that an electric oven manufacturer can calibrate electric ovens which are produced in batches one by one before leaving a factory, and the temperature measurement accuracy of the produced different electric ovens is improved; and the calibration cost can be reduced, the detection efficiency of the calibration device is improved, and the baking effect of the oven and the user experience are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric ovens, and in particular to a device and method for calibrating the temperature of a baking electric oven. Background Art

[0002] As a common kitchen appliance, the accuracy of temperature control of electric ovens directly affects the baking effect and user experience. In the production process of electric ovens, due to differences in components (mainly sensors and heating elements), inconsistencies in production processes and environmental factors, there are often certain deviations in temperature measurement between different batches or even the same batch of electric ovens. This deviation not only affects the baking quality of food, but may also reduce user satisfaction with the product.

[0003] At present, in order to improve the temperature measurement and control accuracy of electric ovens, the commonly used method is to conduct strict quality inspections on sensors and heating elements during the production process. However, this method can only reduce the deviation of temperature measurement to a certain extent, and cannot completely eliminate the influence caused by factors such as production and installation. In addition, traditional calibration methods usually require professional equipment and technicians to operate, which is costly and inefficient. Therefore, studying how to calibrate the temperature of electric ovens one by one before leaving the factory, thereby improving the accuracy and efficiency of temperature measurement in electric ovens and reducing the cost of measurement, is one of the problems that need to be solved urgently.

[0004] Patent CN117752232A mentions an oven temperature calibration method, an oven and an oven temperature calibration system, and discloses an automatic calibration device for the oven and the oven cavity temperature, wherein the calibration device includes a calibration temperature sensor and a position adjustment device; the calibration method is to obtain the target oven setting temperature and the target cooking mode input by the user; detect the target cooking area where the food is located; in the correspondence between the pre-stored oven setting temperature, cooking mode, cooking area and temperature correction value, query the target temperature correction value corresponding to the target oven setting temperature, the target cooking mode and the target cooking area; determine the target oven correction temperature according to the target temperature correction value and the target oven setting temperature, and control the oven to heat according to the target oven correction temperature, so as to realize the oven setting temperature calibration, but because it divides the different cooking areas in the entire oven, and then corrects the heating according to the measurement results, its structure is relatively complex and the cost is relatively high. Summary of the invention

[0005] In view of this, the present invention aims to propose a device and method for calibrating the temperature of a baking electric oven, so as to solve the problem in the prior art that in the production process of electric ovens, due to factors such as differences in parts, processes and environments, it is easy for different electric ovens produced to have certain deviations in temperature measurement. Even if the detection is carried out during the production process of parts, it is impossible to completely guarantee that the temperature measurement is free of deviation, and when manual calibration is adopted, it will also face the problems of high calibration cost and low efficiency. In this way, the structure of the calibration device can be effectively simplified, so that electric oven manufacturers can calibrate the batch-produced electric ovens one by one before leaving the factory, and improve the accuracy of the temperature measurement of the different electric ovens produced; it can also reduce the calibration cost and improve the detection efficiency of the calibration device. In addition, through the setting of the calibration method, it is also conducive to enhancing the calibration reliability of the calibration device, thereby improving the baking effect and user experience of the oven.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] The present invention relates to a device and method for calibrating the temperature of an electric baking oven. The device comprises a temperature probe and a calibration controller; the calibration controller is connected to the temperature probe and an oven electronic control device in two-way communication; the calibration controller comprises a temperature measuring circuit, which is integrated and arranged inside the calibration controller; the temperature measuring circuit is connected to the temperature probe; the oven electronic control device comprises an oven controller, a temperature sensor, a heating element and an external memory; the oven controller is connected to the calibration controller, the temperature sensor, the heating element and the external memory in two-way communication.

[0008] Furthermore, the oven electronic control device is arranged in the electric oven, and a probe interface is arranged on the inner wall of the electric oven. One end of the probe interface is connected to the oven controller, and the other end of the probe interface is connected to one end of the temperature probe through the calibration controller, and the other end of the temperature probe is connected to or separated from the sample to be tested.

[0009] Furthermore, the electric oven further comprises a grill, which is detachably arranged inside the electric oven, and the temperature sensor is arranged on the inner side of the top of the electric oven, and the temperature sensor is arranged above the grill.

[0010] Furthermore, the temperature measurement circuit includes a charging circuit, a thermistor R PT , amplifier circuit and protection circuit; thermistor R PT The two ends of the thermistor are connected to the charging circuit and the amplifier circuit respectively. The amplifier circuit is far away from the thermistor R PT One end of the protection circuit is connected to one end of the protection circuit, and the other end of the protection circuit is connected to the main circuit in the calibration controller.

[0011] Furthermore, the thermistor R PT For temperature probe.

[0012] Furthermore, the charging circuit includes an operational amplifier A1, a second resistor R2 and a voltage stabilizing circuit; the positive input terminal of the operational amplifier A1 is connected to the power supply Vcc through the voltage stabilizing circuit, and the negative input terminal of the operational amplifier A1 is connected to one end of the second resistor R2, the thermistor R PT The positive pole of the amplifier circuit is connected; the output end of the operational amplifier A1 is connected to the thermistor R PT The other end of the second resistor R2 is grounded.

[0013] Furthermore, the voltage stabilizing circuit includes a first resistor R1 and a voltage stabilizing tube TL431. The power supply Vcc is connected to the cathode and reference end of the voltage stabilizing tube TL431 and the positive input end of the operational amplifier A1 through the first resistor R1. The anode of the voltage stabilizing tube TL431 is grounded.

[0014] Furthermore, the voltage regulator tube TL431, the first resistor R1, the second resistor R2 and the operational amplifier A1 form a constant current source.

[0015] Further, the amplifier circuit includes an amplifier circuit 1, an amplifier circuit 2, an amplifier circuit 3, a third resistor R3, a sixth resistor R6, an eighth resistor R8 and a ninth resistor R9; one end of the amplifier circuit 1 is connected to the thermistor R PT The other end of the amplifier circuit is connected to the positive electrode of the amplifier circuit, the other end of the amplifier circuit is connected to one end of the amplifier circuit two and the amplifier circuit three through the third resistor R3 and the sixth resistor R6 respectively, and the other end of the amplifier circuit two is connected to the thermistor R PT The other end of the amplifying circuit 2 is connected to the negative electrode of the amplifying circuit 2 through the eighth resistor R8, respectively, and the other end of the amplifying circuit 3 is connected to one end of the ninth resistor R9 and the other end of the amplifying circuit 3. The other end of the amplifying circuit 3 is connected to the protection circuit; the other end of the ninth resistor R9 is grounded.

[0016] A method for calibrating the temperature of a baking electric oven, the method being applied to the device for calibrating the temperature of a baking electric oven; the method comprising the following steps:

[0017] Step 1: Pre-preparation: pre-process the sample to be tested, the calibration device and the electric oven to be calibrated before testing;

[0018] Step 2: Temperature detection and data collection: Select the "calibration mode" of the electric oven and start it; the temperature probe and temperature sensor respectively monitor the temperature of the food sample to be tested and the inner cavity temperature inside the electric oven, and transmit the temperature information to the calibration controller in their own way;

[0019] Step 3: Correction of temperature measurement algorithm;

[0020] Step 4, data storage: The calibration controller transmits the correction coefficient value K to the oven controller, which stores it in the external memory so that it can be directly called during subsequent use. The calibration of the electric oven to be calibrated is completed.

[0021] Compared with the prior art, the device and method for calibrating the temperature of a baking electric oven described in the present invention have the following beneficial effects:

[0022] Through the setting of the calibration device, the structure of the calibration device can be effectively simplified, so that electric oven manufacturers can calibrate the electric ovens produced in batches one by one before they leave the factory, and improve the accuracy of temperature measurement of different electric ovens produced; it can also reduce the calibration cost and improve the detection efficiency of the calibration device. In addition, through the setting of the calibration method, it is also conducive to enhancing the calibration reliability of the calibration device, thereby improving the baking effect and user experience of the oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the internal system of the calibration device;

[0025] Figure 2 This is a schematic diagram of the temperature calibration device installed in the oven;

[0026] Figure 3 This is a schematic diagram of the temperature probe temperature measurement circuit principle diagram;

[0027] Figure 4 It is a flowchart diagram of the temperature calibration method of the electric oven.

[0028] Explanation of the reference numerals: 1. temperature probe; 11. probe interface; 2. calibration controller; 3. oven electronic control device; 31. oven controller; 32. temperature sensor; 33. heating element; 34. external memory; 4. electric oven; 41. grill; 5. temperature measurement circuit; 51. charging circuit; 511. voltage stabilizing circuit; 52. amplifying circuit; 53. protection circuit. DETAILED DESCRIPTION

[0029] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0032] This embodiment is directed to an electric oven, and is similar to a conventional device for calibrating the temperature of a baking electric oven in that the overall structure is composed of a box, a grill, and electric wires.

[0033] In order to solve the problem in the prior art that in the production process of electric ovens, due to the differences in parts, processes and environment, it is easy for different electric ovens to have certain deviations in temperature measurement. Even if the detection is carried out during the production process of parts, it is impossible to completely guarantee that the temperature measurement is free of deviation. In addition, when manual calibration is adopted, there will be problems of high calibration cost and low efficiency. This embodiment proposes a device and method for temperature calibration of a baking electric oven. The device for temperature calibration of a baking electric oven includes a temperature probe 1 and a calibration controller 2. The calibration controller 2 is connected to the temperature probe 1 and the oven electronic control device 3 in two-way communication. The calibration controller 2 includes a temperature measurement circuit 5, which is integrated in the calibration controller 2. The temperature measurement circuit 5 is connected to the temperature probe 1. The oven electronic control device 3 includes an oven controller 31, a temperature sensor 32, a heating element 33 and an external memory 34. The oven controller 31 is connected to the calibration controller 2, the temperature sensor 32, the heating element 33 and the external memory 34 in two-way communication.

[0034] Through the setting of the calibration device, the structure of the calibration device can be effectively simplified, so that the electric oven manufacturer can calibrate the electric ovens 4 produced in batches one by one before leaving the factory, and improve the accuracy of the temperature measurement of different electric ovens 4 produced; it can also reduce the calibration cost and improve the detection efficiency of the calibration device. In addition, through the setting of the external memory 34, it is convenient to store the key value of the corrected temperature measurement function. It is also possible to use the temperature probe 1 to feedback the specific situation of the temperature control of the food sample, and automatically correct the temperature measurement system of the original system, and then store the corrected data, so as to solve the problem of inaccurate temperature control caused by inconsistent factors such as structural design, component quality, production process and environment in the production process of the electric oven 4, and improve the baking effect and user experience of the electric oven 4. Improve the reliability of the electric oven 4 manufacturer's calibration of the electric oven 4 produced in batches before leaving the factory.

[0035] The oven electric control device 3 is arranged in the electric oven 4. The probe interface 11 is arranged on the inner wall of the electric oven 4. One end of the probe interface 11 is connected to the oven controller 31. The other end of the probe interface 11 is connected to one end of the temperature probe 1 through the calibration controller 2. The other end of the temperature probe 1 is connected to or separated from the sample to be tested. The oven controller 31 is a controller provided by the electric oven 4, which is used to detect the oven temperature, control the components such as the heating element 33, and store the key coefficient value of the corrected temperature measurement function in the external memory 34 of the electric oven 4. The sample to be tested is a food sample to be tested.

[0036] The temperature probe 1 is set to monitor the temperature of the food sample to be tested in the electric oven 4; the calibration controller 2 is connected to the temperature probe 1 to obtain the temperature of the food sample to be tested in the electric oven 4. The calibration controller 2 is connected to the oven controller 31 through a serial port to obtain the temperature value of the temperature sensor 32 in the electric oven 4, and analyzes and processes it to automatically correct the key coefficient value of the temperature measurement function.

[0037] The electric oven 4 further includes a grill 41, which is detachably arranged in the inner cavity of the electric oven 4. The temperature sensor 32 is arranged on the inner side of the top of the electric oven 4, and the temperature sensor 32 is arranged above the grill 41. The temperature sensor 32 is a temperature sensor 32 provided by the electric oven 4, and is distributed in the body of the electric oven 4; it is used to monitor the temperature inside the electric oven 4 in real time. The inner cavity of the body of the electric oven 4 is used to bake the sample to be tested.

[0038] The grill 41 can provide support for the food sample to be tested, ensure all-round heating of the food, and help the temperature probe 1 to more accurately detect the real-time specific temperature value of the food sample to be tested. The temperature sensor 32 is arranged inside the electric oven 4, which can effectively realize the real-time monitoring of the temperature inside the electric oven 4, and improve the calibration accuracy and reliability of the calibration device.

[0039] The temperature measuring circuit 5 includes a charging circuit 51, a thermistor R PT , amplifier circuit 52 and protection circuit 53; thermistor R PT The two ends of the charging circuit 51 and the amplifier circuit 52 are connected respectively, and the amplifier circuit 52 is far away from the thermistor R PT One end of the thermistor R is connected to one end of the protection circuit 53, and the other end of the protection circuit 53 is connected to the main circuit in the calibration controller 2. PT It is temperature probe 1.

[0040] Through the charging circuit 51, the thermistor R PTThe setting of the amplifying circuit 52 and the protecting circuit 53 can effectively improve the measurement accuracy of the temperature probe 1. Under the action of the charging circuit 51, it can be used as a constant current source for the thermistor R PT The setting of the amplifier circuit 52 can ensure that the thermistor R PT The accuracy of the measurement and the amplification of the temperature changes are conducive to ensuring the reliability of the measurement and ensuring that the different degrees of temperature changes are clearly recorded.

[0041] The charging circuit 51 includes an operational amplifier A1, a second resistor R2 and a voltage regulator circuit 511; the positive input terminal of the operational amplifier A1 is connected to the power supply Vcc through the voltage regulator circuit 511, and the negative input terminal of the operational amplifier A1 is connected to one end of the second resistor R2, the thermistor R PT The output terminal of the operational amplifier A1 is connected to the thermistor R PT The other end of the second resistor R2 is connected to the negative electrode; the other end of the second resistor R2 is grounded. Among them, the voltage stabilizing circuit 511 includes a first resistor R1 and a voltage stabilizing tube TL431. The power supply Vcc is connected to the cathode and reference end of the voltage stabilizing tube TL431 and the positive input end of the operational amplifier A1 through the first resistor R1, and the anode of the voltage stabilizing tube TL431 is grounded. In addition, the voltage stabilizing tube TL431 is a controllable precision voltage stabilizing source. The voltage stabilizing tube TL431, the first resistor R1, the second resistor R2 and the operational amplifier A1 constitute a constant current source for the thermistor R PT powered by.

[0042] By configuring the components in the charging circuit 51 , it is possible to effectively provide a stable voltage and current to the temperature probe 1 , thereby improving the safety of the circuit and the efficiency of temperature detection.

[0043] The amplifier circuit 52 includes an amplifier circuit 1, an amplifier circuit 2, an amplifier circuit 3, a third resistor R3, a sixth resistor R6, an eighth resistor R8, and a ninth resistor R9; one end of the amplifier circuit 1 is connected to the thermistor R PT The other end of the amplifier circuit is connected to the positive electrode of the amplifier circuit, the other end of the amplifier circuit is connected to one end of the amplifier circuit two and the amplifier circuit three through the third resistor R3 and the sixth resistor R6 respectively, and the other end of the amplifier circuit two is connected to the thermistor R PT The other end of the amplifying circuit 2 is connected to the negative electrode of the amplifying circuit 2 through the eighth resistor R8, respectively, and the other end of the amplifying circuit 3 is connected to one end of the ninth resistor R9 and the other end of the amplifying circuit 3. The other end of the amplifying circuit 3 is connected to the protection circuit 53; the other end of the ninth resistor R9 is grounded.

[0044] The first amplifier circuit includes an operational amplifier A2 and a fourth resistor R4; the positive input terminal of the operational amplifier A2 is connected to the thermistor R PTThe positive electrode of the operational amplifier A2 is connected, the negative input end of the operational amplifier A2 is connected to one end of the third resistor R3 and the fourth resistor R4 respectively, and the other end of the fourth resistor R4 is connected to the output end of the operational amplifier A2 and one end of the sixth resistor R6 respectively.

[0045] The second amplifier circuit includes an operational amplifier A3 and a fifth resistor R5; the positive input terminal of the operational amplifier A3 is connected to the thermistor R PT The negative input terminal of the operational three-amplifier A3 is respectively connected to the other end of the third resistor R3 and one end of the fifth resistor R5, and the other end of the fifth resistor R5 is respectively connected to the output end of the operational three-amplifier A3 and one end of the eighth resistor R8.

[0046] The three-amplification circuit includes an operational four-amplifier A4 and a seventh resistor R7; the positive input terminal of the operational four-amplifier A4 is connected to the other end of the eighth resistor R8, the negative input terminal of the operational four-amplifier A4 is respectively connected to the other end of the sixth resistor R6 and one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the output terminal of the operational four-amplifier A4 and then connected to the protection circuit 53.

[0047] The instrument amplifier composed of the operational amplifier A2, the operational amplifier A3 and the operational amplifier A4 can effectively amplify the tiny signal of the temperature change detected by the temperature probe 1, so as to facilitate the subsequent measurement, analysis and processing of the real-time temperature of the food sample to be tested. It can also effectively suppress the common mode signal and amplify the differential mode signal, thereby ensuring the accuracy and reliability of the measured temperature signal.

[0048] The protection circuit 53 includes a tenth resistor R10 and a voltage-stabilizing diode Z1; one end of the tenth resistor R10 is connected to the output end of the operational quad amplifier A4, and the other end of the tenth resistor R10 is respectively connected to the cathode of the voltage-stabilizing diode Z1 and the analog-to-digital conversion input port of the main circuit of the calibration controller 2, and the anode of the voltage-stabilizing diode Z1 is grounded. The voltage at the connection point of the tenth resistor R10 and the voltage-stabilizing diode Z1 is recorded as the output voltage Uo; the calibration controller 2 can obtain the temperature of the temperature probe 1 by measuring the value of the output voltage Uo.

[0049] By setting the Zener diode Z1, the output voltage Uo can be clamped at V Z1 The protection circuit 53 can effectively improve the safety of the circuit, enhance the reliability of the circuit operation, and ensure the stability of the analog-to-digital conversion input port of the calibration controller 2.

[0050] Analysis of measurement principle: The voltage at the connection point between the reference end of the voltage regulator tube TL431 and the positive input end of the operational amplifier A1 is recorded as V1, and the voltage at the connection point between the negative input end of the operational amplifier A1 and the second resistor R2 is recorded as V2. The current flowing from the second resistor R2 toward the ground is recorded as I1; the current flowing from the negative input end of the operational amplifier A1 toward the second resistor R2 is recorded as I2; the thermistor R PT The current flowing from the positive terminal of the operational amplifier A3 to the charging circuit 51 is recorded as I5, the current flowing from the operational amplifier A2 to the charging circuit 51 is recorded as I4, and the current flowing from I4 and I5 to the second resistor R2 is recorded as I3; the positive input terminal of the operational amplifier A3 flows to the thermistor R PT The current at the negative electrode is recorded as I6.

[0051] The voltage regulator TL431 and the first resistor R1 form a precision voltage regulator circuit 511 to provide a reference voltage V1 = 2.5V. Because of the "virtual short", V1 = V2; because of the "virtual disconnection", I2 = I4 = I6 = 0, then I1 = I3 = I5, and the current flowing through R PT The constant current is:

[0052]

[0053] Then R PT The voltage across the terminals is:

[0054] U i =-I5×R PT ;

[0055] In addition, the operational amplifier A2, the operational amplifier A3, and the operational amplifier A4 constitute the instrument amplifier circuit 52. Let R4 = R5, R6 = R8, R7 = R9, then the calculation formula of the output voltage Uo of the temperature measurement circuit 5 is:

[0056]

[0057] Before the electric oven 4 leaves the factory, each electric oven 4 is calibrated one by one to ensure that the temperature control accuracy of each electric oven 4 meets the requirements.

[0058] Taking the temperature calibration of a baking electric oven 4 as an example, the specific operation method of calibrating the electric oven 4 using a temperature calibration device in the present application is introduced.

[0059] A method for calibrating the temperature of a baking electric oven, the method being applied to the device for calibrating the temperature of a baking electric oven, the method comprising the following steps:

[0060] Step 1: Pre-preparation: pre-process the sample to be tested, the calibration device and the electric oven 4 to be calibrated before testing;

[0061] Step 2, temperature detection and data collection: select the "calibration mode" of the electric oven 4 and start it; the temperature probe 1 and the temperature sensor 32 respectively monitor the temperature of the food sample to be tested and the inner cavity temperature inside the electric oven 4, and transmit the temperature information to the calibration controller 2 in their own way.

[0062] Step 3, temperature measurement algorithm correction: after the first preset baking time T0, at every second preset time t, the real-time temperature values ​​of the temperature sensor 32 and the temperature probe 1 are measured respectively, the number of measurements in each stage is the preset number n, and the average value of the real-time temperature values ​​of the temperature sensor 32 and the temperature probe 1 is calculated and recorded as the measured temperature value T1 of the temperature sensor 32 and the measured temperature value T2 of the temperature probe 1 in the current stage respectively; the calibration controller 2 obtains the corrected temperature value T3 of the food sample to be tested by calculation based on the relationship between the preset temperature of the food sample to be tested of the development prototype and the temperature sensor 32 stored in the storage, and the correction coefficient value is calculated as:

[0063]

[0064] Step 4, data storage: the calibration controller 2 transmits the correction coefficient value K to the oven controller 31, which stores it in the external memory 34 so that it can be directly called during subsequent use. In this way, the calibration of the electric oven 4 to be calibrated is completed.

[0065] Among them, in step 2, after the temperature probe 1 monitors the temperature of the food sample to be tested inside the electric oven 4, it directly transmits the temperature information to the calibration controller 2; after the temperature sensor 32 monitors the temperature of the food sample to be tested inside the electric oven 4, it transmits the monitored temperature information to the calibration controller 2 through the oven controller 31.

[0066] In this embodiment, in step three, the first preset time T0 is 15 minutes, the second preset time t is 2 minutes, and the value of the preset number n is 5.

[0067] By setting the calibration method, it is also beneficial to enhance the calibration reliability of the calibration device, thereby improving the baking effect and user experience of the oven. It can also solve the problem that during the mass production of electric ovens 4, due to the influence of various factors, there may be certain temperature differences between different ovens. Through the temperature calibration device of the present application, each electric oven 4 can be tested and calibrated one by one to ensure that each electric oven 4 shipped has similar temperature performance, which is beneficial to improving the consistency and reliability of the product. Compared with the prior art, the coordination of the calibration method and device of the present application is more conducive to improving the accuracy of temperature control, reducing temperature errors, and improving the quality of baking. It can provide an efficient, accurate and reliable testing method for electric oven 4 manufacturers, improve product quality and market competitiveness, and also provide consumers with a better baking experience.

[0068] Among them, step one includes:

[0069] Step S11: firstly place the electric oven 4 to be calibrated in the test area and connect the power supply to power on;

[0070] Step S12: Place the food samples to be tested in the center of the grill 41 inside the electric oven 4, connect the calibration controller 2 of the calibration device to the inner wall of the electric oven 4, and insert the temperature probe 1 of the calibration device into the center of the sample to be tested.

[0071] In this embodiment, the food sample to be tested is made of food-grade silica gel, and the shape of the food-grade silica gel is a rectangular parallelepiped.

[0072] By inserting the temperature probe 1 into the center of the sample to be tested, the temperature of the food sample can be monitored more accurately in real time.

[0073] In the present invention, any electric oven may include a device structure for temperature calibration of a baking electric oven as described in this embodiment, and based on the relevant structures and assembly relationship of the calibration controller 2 and the oven controller 31 provided in this embodiment, the electric oven also includes conventional components including a box body, a grill, electric wires and other structures. Since they are all prior art, they will not be described in detail here.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for calibrating the temperature of a baking electric oven, characterized in that: The invention comprises a temperature probe (1) and a calibration controller (2); the calibration controller (2) is bidirectionally connected to the temperature probe (1) and an oven electronic control device (3); the calibration controller (2) comprises a temperature measurement circuit (5), which is integrated and arranged inside the calibration controller (2); the temperature measurement circuit (5) is connected to the temperature probe (1); the oven electronic control device (3) comprises an oven controller (31), a temperature sensor (32), a heating element (33) and an external memory (34); the oven controller (31) is bidirectionally connected to the calibration controller (2), the temperature sensor (32), the heating element (33) and the external memory (34).

2. A device for calibrating the temperature of a baking electric oven according to claim 1, characterized in that: The oven electric control device (3) is arranged in the electric oven (4), and a probe interface (11) is arranged on the inner wall of the electric oven (4). One end of the probe interface (11) is connected to the oven controller (31), and the other end of the probe interface (11) is connected to one end of the temperature probe (1) through the calibration controller (2), and the other end of the temperature probe (1) is connected to or separated from the sample to be tested.

3. A device for calibrating the temperature of a baking electric oven according to claim 2, characterized in that: The electric oven (4) further comprises a grill (41), which is detachably arranged inside the electric oven (4), and a temperature sensor (32) is arranged on the inner side of the top of the electric oven (4), and the temperature sensor (32) is arranged above the grill (41).

4. The device for calibrating the temperature of a baking electric oven according to claim 2, characterized in that: The temperature measurement circuit (5) comprises a charging circuit (51), a thermistor R PT , an amplifier circuit (52) and a protection circuit (53); a thermistor R PT The two ends are respectively connected to a charging circuit (51) and an amplifier circuit (52), and the amplifier circuit (52) is far away from the thermistor R PT One end of the protection circuit (53) is connected to one end of the protection circuit (53), and the other end of the protection circuit (53) is connected to the main circuit in the calibration controller (2).

5. The device for calibrating the temperature of a baking electric oven according to claim 4, characterized in that: The thermistor R PT is a temperature probe (1).

6. The device for calibrating the temperature of a baking electric oven according to claim 4, characterized in that: The charging circuit (51) comprises an operational amplifier A1, a second resistor R2 and a voltage stabilizing circuit (511); the positive input end of the operational amplifier A1 is connected to a power source Vcc through the voltage stabilizing circuit (511), and the negative input end of the operational amplifier A1 is connected to one end of the second resistor R2, the thermistor R PT The output end of the operational amplifier A1 is connected to the thermistor R PT The other end of the second resistor R2 is grounded.

7. The device for calibrating the temperature of a baking electric oven according to claim 6, characterized in that: The voltage stabilizing circuit (511) comprises a first resistor R1 and a voltage stabilizing tube TL431, the power source Vcc is respectively connected to the cathode and reference end of the voltage stabilizing tube TL431 and the positive input end of the operational amplifier A1 through the first resistor R1, and the anode of the voltage stabilizing tube TL431 is grounded.

8. The device for calibrating the temperature of a baking electric oven according to claim 7, characterized in that: The voltage regulator tube TL431, the first resistor R1, the second resistor R2 and the operational amplifier A1 form a constant current source.

9. The device for calibrating the temperature of a baking electric oven according to claim 6, characterized in that: The amplifier circuit (52) comprises an amplifier circuit 1, an amplifier circuit 2, an amplifier circuit 3, a third resistor R3, a sixth resistor R6, an eighth resistor R8 and a ninth resistor R9; one end of the amplifier circuit 1 is connected to the thermistor R PT The other end of the amplifier circuit is connected to the positive electrode of the amplifier circuit, the other end of the amplifier circuit is connected to one end of the amplifier circuit two and the amplifier circuit three through the third resistor R3 and the sixth resistor R6 respectively, and the other end of the amplifier circuit two is connected to the thermistor R PT The other end of the amplifying circuit 2 is connected to the negative electrode of the amplifying circuit 2 through the eighth resistor R8, respectively, and the other end of the amplifying circuit 3 is connected to one end of the ninth resistor R9 and the other end of the amplifying circuit 3 through the eighth resistor R8, and the other end of the amplifying circuit 3 is connected to the protection circuit (53); the other end of the ninth resistor R9 is grounded.

10. A method for calibrating the temperature of a baking electric oven, characterized in that: The method is applied to a device for temperature calibration of a baking electric oven according to any one of claims 1 to 9; the method comprises the following steps: Step 1: Pre-preparation: pre-processing the sample to be tested, the calibration device and the electric oven (4) to be calibrated before testing; Step 2: Temperature detection and data collection: Select the "calibration mode" of the electric oven (4) and start it; the temperature probe (1) and the temperature sensor (32) respectively monitor the temperature of the food sample to be tested and the inner cavity temperature inside the electric oven (4), and transmit the temperature information to the calibration controller (2) in their own way; Step 3: Correction of temperature measurement algorithm; Step 4: Data storage: The calibration controller (2) transmits the correction coefficient value K to the oven controller (31), which stores it in the external memory (34) so ​​that it can be directly called in subsequent use. The calibration of the electric oven (4) to be calibrated is completed.

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