Humidity detection method and cooking equipment

Abstract

The invention relates to a humidity detection method and cooking equipment, and the method comprises the following steps: a temperature detection device detects the temperature T1 of a heat conductor and the temperature T2 of a first area, the heat conductor comprises a first part and a second part, the first part exchanges heat with the first area, and the second part exchanges heat with the second area; the second part exchanges heat with the second area; the temperature T1 of the heat conductor and the temperature T2 of the first area are used for calculating the humidity of the first area, the temperature of a cooking cavity of the cooking utensil and the temperature of the damp and hot air after conduction are detected through a temperature sensor, so that a heat transfer coefficient is obtained, and then the humidity in the cooking cavity is judged through the heat transfer coefficient. According to the detection method, the temperature sensor can have better detection precision in a high-temperature state, and the cost of the temperature sensor is relatively low, so that the detection cost can be reduced, and the detection precision can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of humidity detection, and in particular relates to a humidity detection method and cooking equipment. Background Art

[0002] When cooking food in an oven, there are certain requirements for the humidity of the oven cavity. Even the cooking effect is greatly affected by the humidity. When the humidity does not meet the requirements, the cooking effect is unsatisfactory. In order to control the humidity in the oven, it is necessary to first detect the humidity in the oven, and then adjust the humidity according to the humidity detection results to meet the cooking requirements.

[0003] Since the oven cavity is in a high temperature environment during operation, common humidity sensors cannot work under high temperatures and cannot accurately detect humidity conditions. Currently, there are some methods that use conductivity, infrared sensors, ultrasonic detectors, oxygen sensors, etc. to measure the humidity in the oven, but these detection methods are expensive and difficult to popularize in home appliances. There is no method on the market to detect the humidity of cooking equipment by temperature. Summary of the invention

[0004] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a humidity detection method and a cooking device, which can detect the humidity of the cooking device by temperature, thereby reducing the detection cost and ensuring the accuracy of the detection.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A humidity detection method comprises the following steps:

[0007] The temperature T1 of the heat conductor and the temperature T2 of the first region are detected by a temperature detection device, respectively, wherein the heat conductor includes a first part and a second part, the first part performs heat exchange with the first region, and the second part performs heat exchange with the second region;

[0008] The humidity of the first area is calculated using the temperature T1 of the heat conductor and the temperature T2 of the first area.

[0009] As a preferred solution of the present invention, the humidity of the first area is calculated using the temperature T1 of the heat conductor and the temperature T2 of the first area, including calculating the heat transfer coefficient of the steam-air mixture using T1 and T2, and then inferring the humidity of the first area through the relationship between the heat transfer coefficient and the humidity.

[0010] As a preferred solution of the present invention, the temperature detection device includes a first temperature sensor and a second temperature sensor, the first temperature sensor detects the temperature T1 of the heat conductor, the second temperature sensor detects the temperature T2 of the first area, the environment of the second part is room temperature, and the relationship between the heat transfer coefficient and the temperature of each part is as follows:

[0011] α×A 1 ×(T 2 -T 1 )=λ×1 / L 1 ×A 2 ×(T 1 -T 室温 )

[0012] Where: λ is the thermal conductivity of the heat conductor, which is related to the material itself; α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated based on the value of α; A 1 is the area where heat exchange occurs between the first part and the first region, which is a design-determined value; L 1 is the length of the heat conductor, which is the design value; A 2 is the cross-sectional area of ​​the heat conductor, which is the design value; T 室温 is the temperature of the current environment, which is a fixed value.

[0013] As a preferred solution of the present invention, the second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps:

[0014] It is determined whether the temperature T1 of the heat conductor exceeds the set threshold value T0; if yes, it is determined that the heat dissipation fan is working abnormally; if no, it is determined that the heat dissipation fan is working normally.

[0015] As a preferred solution of the present invention, the temperature detection device includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The temperature T1 of the heat conductor includes the temperature T1.1 of the first part and the temperature T1.2 of the second part. The first temperature sensor detects the temperature T1.1 of the first part, the second temperature sensor detects the temperature T2 of the first area, and the third temperature sensor detects the temperature T1.2 of the second part. The relationship between the heat transfer coefficient and the temperature of each part is as follows:

[0016] α×A 1 ×(T 2 -T 1.1 )=λ×1 / L 1 ×A 2 ×(T 1.1 -T1.2 )

[0017] Where: λ is the thermal conductivity of the heat conductor, which is related to the material itself; α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated based on the value of α; A 1 is the area where heat exchange occurs between the first part and the first region, which is a design-determined value; L 1 is the length of the heat conductor, which is the design value; A 2 is the cross-sectional area of ​​the heat conductor, which is a value determined for design.

[0018] As a preferred solution of the present invention, the second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps:

[0019] It is determined whether the temperature T1.2 of the second part exceeds a set threshold value T0; if yes, it is determined that the cooling fan is operating abnormally; if no, it is determined that the cooling fan is operating normally.

[0020] As a preferred solution of the present invention, the temperature detection device includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor, the heat conductor also includes a third part connecting the first part and the second part, the temperature T1 of the heat conductor includes the temperature T1.1 of the first part, the temperature T1.3 of the connection between the third part and the first part, and the temperature T1.4 of the connection between the third part and the second part, the first temperature sensor detects the temperature T1.1 of the first part, the second temperature sensor detects the temperature T2 of the first area, the third temperature sensor detects the temperature T1.3 of the connection between the third part and the first part, and the fourth temperature sensor detects the temperature T1.4 of the connection between the third part and the second part, and the relationship between the heat transfer coefficient and the temperature of each part is as follows,

[0021] α×A 1 ×(T 2 -T 1.1 )=λ×1 / L 2 ×A 3 ×(T 1.3 -T 1.4 )

[0022] Where: α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated according to the value of α; λ is the thermal conductivity of the third part, which is related to the material itself; A 1is the area where heat exchange occurs between the first part and the first region, which is a design-determined value; A 3 is the cross-sectional area of ​​the third part, which is the value determined for design; L 2 is the length of the third section, determine the value for your design.

[0023] As a preferred solution of the present invention, the second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps:

[0024] It is determined whether the temperature T1.4 at the connection point between the third part and the second part exceeds the set threshold value T0; if yes, it is determined that the cooling fan is working abnormally; if no, it is determined that the cooling fan is working normally.

[0025] As a preferred embodiment of the present invention, the method further comprises the following steps:

[0026] Determine whether the temperature T2 of the first area is within the applicable temperature range [T2min, T2max], and the interval [T2min, T2max] includes and is greater than the settable operating temperature range of the cooking device; if not, determine that the cooking device is operating at a fault; if yes, determine that the cooking device is operating normally.

[0027] The present invention also provides a cooking device, which includes a processor; the processor is used to execute the steps of the humidity detection method.

[0028] The beneficial effect of the present invention is that the temperature of the cooking cavity of the cooking device and the temperature after the hot and humid air is conducted are detected by the temperature sensor, so as to obtain the heat transfer coefficient, and then the humidity in the cooking cavity is judged by the heat transfer coefficient. The detection method can make the temperature sensor have better detection accuracy under high temperature state, and the cost of the temperature sensor is low, so that the detection cost can be reduced and the detection accuracy can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the heat dissipation state of the heat conductor;

[0030] Figure 2 It is a schematic diagram of a first embodiment of a humidity detection method;

[0031] Figure 3 It is a schematic diagram of a second embodiment of the humidity detection method;

[0032] Figure 4 It is a schematic diagram of a third embodiment of the humidity detection method;

[0033] Figure 5 is a schematic diagram of the installation of a heat conductor in a cooking device;

[0034] Figure 6 is a schematic cross-sectional view of a heat conductor;

[0035] Figure 7 is a schematic diagram of a first heat dissipation structure of a heat conductor;

[0036] Figure 8 is a schematic diagram of a second heat dissipation structure of a heat conductor;

[0037] Fig. 9 It is a schematic diagram showing the relationship between the heat transfer coefficient and humidity of a steam-air mixture.

[0038] Figure numerals: heat conductor 1 , first part 11 , second part 12 , heat dissipation fins 121 , heat dissipation ring 122 , third part 13 , heat insulation member 14 , mounting hole 15 , opening 16 , temperature measuring resistor 17 , circuit 171 , protective housing 18 , heat dissipation fan 2 . DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] The humidity detection method in this scheme includes the following steps:

[0041] The temperature T1 of the heat conductor 1 and the temperature T2 of the first region p1 are respectively detected by a temperature detection device, wherein the heat conductor 1 comprises a first portion 11 and a second portion 12, wherein the first portion 11 performs heat exchange with the first region p1, and the second portion 12 performs heat exchange with the second region p2;

[0042] The humidity of the first area p1 is calculated using the temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1.

[0043] This humidity detection method is based on the structure of thermal conductor 1, referring to Figure 1 The heat conductor 1 has a first part 11 and a second part 12. The first part 11 can exchange heat with the first area p1, and the second part 12 can exchange heat with the second area p2. The temperatures of the first area p1 and the second area p2 are different, so that heat is transferred from the first part 11 to the second part 12 along the heat conductor 1, or from the second part 12 to the first part 11 along the heat conductor 1.

[0044] The temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1 are detected by a temperature detection device, and the humidity of the first area p1 is calculated using the temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1, thereby realizing the humidity detection of the cooking equipment by temperature, which not only reduces the cost of humidity detection, but also ensures the accuracy of humidity detection.

[0045] Furthermore, in the present application, the temperature T1 of the heat conductor 1 and the temperature T2 of the first region p1 are used to calculate the humidity of the first region p1, including using T1 and T2 to calculate the heat transfer coefficient α of the steam-air mixture, and then calculating the humidity of the first region p1 through the relationship between the heat transfer coefficient α and the humidity. The specific calculation method can be based on the relationship diagram between the heat transfer coefficient and the humidity of the steam-air mixture ( Fig. 9 ) to obtain the humidity value.

[0046] In the humidity detection method of the present embodiment, since the temperatures of the first area p1 and the second area p2 are different, and the heat conductor 1 only exchanges heat with the first area p1 and the second area p2, heat is transferred from the first area p1 to the second area p2, or from the second area p2 to the first area p1, through the heat conductor 1. Therefore, according to the law of conservation of heat transfer by the heat conductor 1, the heat transfer coefficient of the gas can be obtained by detecting the temperature with a temperature detection device, and then the steam ratio can be obtained through the heat transfer coefficient, so that the humidity can be indirectly calculated. Compared with using a humidity sensor to directly detect the humidity, the humidity detection method can be applied in a high temperature environment, and the accuracy of the detection result can be ensured in a high temperature environment.

[0047] In the implementation case of this method, the outer side of the heat conductor 1 is wrapped with a heat insulating member 14, referring to Figure 1 and Figure 5 The heat insulating member 14 isolates the heat conductor 1 from the gas and / or cooling medium and / or heat conductor outside the heat conductor 1, so that no heat loss occurs during the heat transfer between the first area p1 and the second area p2 through the heat conductor 1, so as to ensure the accuracy of the calculated humidity. The heat insulating member 14 can be made of heat insulating materials such as heat insulating rubber.

[0048] In the implementation case of the present method, the temperature of the first area p1 is greater than the temperature of the second area p2, that is, the heat is transferred from the first area p1 to the heat conductor 1, and then transferred from the heat conductor 1 to the second area p2. The humidity detection method of this implementation case is suitable for use in a cooking device, and the cooking device includes a processor, and the processor is used to execute the steps of the humidity detection method. The first area p1 can be set in the inner cavity of the cooking device, and the second area p2 can be set outside the inner cavity of the cooking device, such as in a heat dissipation environment, referring to Figure 5 Through the humidity detection method of this implementation case, the humidity in the inner cavity can be calculated more accurately.

[0049] Furthermore, the humidity detection method further comprises the following steps:

[0050] Determine whether the temperature T2 of the first area p1 is within the applicable temperature range [T2min, T2max], and the interval [T2min, T2max] includes and is greater than the settable operating temperature range of the cooking device; if not, it is determined that the cooking device is malfunctioning; if yes, it is determined that the cooking device is operating normally.

[0051] The temperature T2 of the first area p1 is used to determine whether the cooking device is in a normal working state. When the cooking device is determined to be in a normal working state, the humidity of the first area p1 is calculated using the temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1.

[0052] like Figure 2 As shown, Example 1

[0053] In the present application, the temperature detection device includes a first temperature sensor a1 and a second temperature sensor a2. The first temperature sensor a1 is used to detect the temperature T1 of the heat conductor 1, and the second temperature sensor a2 is used to detect the temperature T2 of the first area p1.

[0054] According to the law of conservation of energy, Q1=Q2, Q1 is the heat transferred between the first region p1 and the first part 11 of the heat conductor 1, Q2 is the heat transferred between the first part 11 and the second part 12 of the heat conductor 1, and the temperature of the second part 12 of the heat conductor 1 is room temperature. The relationship between the heat transfer coefficient and the temperature of each part is as follows:

[0055] α×A 1 ×(T 2 -T 1 )=λ×1 / L 1 ×A 2 ×(T 1 -T 室温 )

[0056] Where α is the heat transfer coefficient of the air in the first region p1, λ is the thermal conductivity of the heat conductor 1, and A 1 is the area where heat exchange occurs between the first portion 11 and the first region p1, A 2 is the cross-sectional area of ​​the heat conductor 1, L 1 is the length of the heat conductor 1, T1 is the temperature detected by the first temperature sensor a1, T2 is the temperature detected by the second temperature sensor a2, and is the temperature of the current environment, where λ, A 1 , A 2 , L 1 To determine the value, obtain the value of (T2-T1) and (T1-T 室温 ) value can be calculated to obtain α, thereby calculating the humidity of the first area p1.

[0057] Compared with humidity detection methods such as infrared, ultrasonic, and oxygen sensors, the detection element used in this embodiment is a temperature sensor, which is relatively cheap and has greater application value. Therefore, this detection method can not only make the temperature sensor have better detection accuracy under high temperature conditions, but also reduce the cost of detection.

[0058] The end of the first part 11 that performs heat exchange with the first area p1 is the head end of the first part 11, and the end of the first part 11 close to the second part 12 is the tail end of the first part 11. In this embodiment, the first temperature sensor a1 can be set at any position of the heat conductor 1. When the first temperature sensor a1 is set far away from the head end of the first part 11, the heat transferred between the first area p1 and the first part 11 of the heat conductor 1 needs to pass through a part of the length of the heat conductor 1 to reach the position of the first temperature sensor a1, and there is heat loss in this process. However, in the implementation application, the overall length of the heat conductor 1 is small, and this part of the heat loss is small and can be ignored.

[0059] The end of the second part 12 close to the first part 11 is the head end of the second part 12, and the end of the second part 12 that exchanges heat with the second area p2 is the tail end of the second part 12. According to the heat transfer formula, in the above formula, L 1 It should be the length of the heat conductor 1 between the first temperature sensor a1 and the end of the second part 12. Similarly, in practical applications, the overall length of the heat conductor 1 is small, and the length of the part of the heat conductor 1 between the first temperature sensor a1 and the end of the second part 12 is slightly different from the overall length of the heat conductor 1. Therefore, L can be 1 It is approximately considered to be equal to the length of the heat conductor 1.

[0060] Of course, in this embodiment, in order to make the humidity detection of the first area p1 more accurate, it is preferred to set the first temperature sensor a1 at the head end of the first part 11, so as to reduce the heat loss from the head end of the first part 11 to the position of the first temperature sensor a1, and the difference between the length of the part of the heat conductor 1 between the first temperature sensor a1 and the tail end of the second part 12 and the overall length of the heat conductor 1, thereby making the calculated value of the heat transfer coefficient α more accurate.

[0061] In practical applications, if the heat conductor 1 is of equal diameter, the first temperature sensor a1 is set at any position of the heat conductor 1, and the cross-sectional area of ​​the heat conductor 1 is equal. In this case, the heat transfer area A 2 is equal to the cross-sectional area of ​​the heat conductor 1; if the heat conductor 1 is a variable diameter structure, then the cross-sectional area at any position of the heat conductor 1 is not equal. In this case, the heat transfer area A 2 is the equivalent cross-sectional area of ​​the heat conductor 1 from the first temperature sensor a1 to the tail end of the second part 12.

[0062] Furthermore, the second area p2 is a heat dissipation duct, and a heat dissipation fan 2 is provided in the heat dissipation duct forcibly dissipating the heat of the second portion 12 of the heat conductor 1. The method further comprises the following steps:

[0063] It is determined whether the temperature T1 of the heat conductor 1 exceeds the set threshold value T0; if yes, it is determined that the heat dissipation fan 2 is working abnormally; if no, it is determined that the heat dissipation fan 2 is working normally.

[0064] In this embodiment, a controller is provided in the cooking device, and the controller controls the cooling fan 2 to work at a set speed, controls the airflow to pass through the second portion 12 of the heat conductor 1 at a stable flow rate, and forcibly dissipates heat from the second portion 12 of the heat conductor 1, so whether the cooling fan 2 is in a normal working state can be judged by the temperature T1 of the heat conductor 1. If the cooling fan 2 is judged to be in a normal working state, the humidity of the first area p1 is calculated using the temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1.

[0065] It can be foreseen that the step of judging whether the cooling fan 2 is in a normal working state by the temperature T1 of the heat conductor 1 can be used in combination with the step of judging whether the cooking device is in a normal working state by the temperature T2 of the first area p1, that is, if the cooling fan 2 and the cooking device are both judged to be in a normal working state, the humidity of the first area p1 is calculated using the temperature T1 of the heat conductor 1 and the temperature T2 of the first area p1.

[0066] like Figure 3 As shown, Example 2

[0067] In the present application, the temperature detection device includes a first temperature sensor a1, a second temperature sensor a2 and a third temperature sensor a3, and the temperature T1 of the heat conductor 1 includes the temperature T1.1 of the first part 11 and the temperature T1.2 of the second part 12, that is, the detection method includes the following steps;

[0068] Detecting the temperature T1.1 of the first part 11 by means of the first temperature sensor a1;

[0069] Detecting the temperature T2 of the first area p1 by the second temperature sensor a2;

[0070] Detecting the temperature T1.2 of the second part 12 by the third temperature sensor a3;

[0071] The humidity of the first area p1 is calculated using the temperature T1.1 of the first portion 11, the temperature T2 of the first region p1, and the temperature T1.2 of the second portion 12.

[0072] According to the law of conservation of energy, Q1=Q2, Q1 is the heat transferred between the first region p1 and the first part 11 of the heat conductor 1, and Q2 is the heat transferred between the first part 11 and the second part 12 of the heat conductor 1. The relationship between the heat transfer coefficient and the temperature of each part is as follows:

[0073] α×A 1 ×(T 2 -T 1.1 )=λ×1 / L 1 ×A 2 ×(T 1.1 -T 1.2 )

[0074] Where α is the heat transfer coefficient of the air in the first region p1, λ is the thermal conductivity of the heat conductor 1, and A 1 is the area where heat exchange occurs between the first portion 11 and the first region p1, A 2 is the cross-sectional area of ​​the heat conductor 1, L 1 is the length of the heat conductor 1, T1.1 is the temperature detected by the first temperature sensor a1, T2 is the temperature detected by the second temperature sensor a2, and T1.2 is the temperature detected by the third temperature sensor a3, where λ, A 1 , A 2 , L 1 To determine the value, the (T2-T1.1) value and the (T1.1-T1.2) value are obtained to calculate α, thereby calculating the humidity of the first area p1.

[0075] Compared with the first embodiment, the present embodiment adds a third temperature sensor a3 to detect the temperature of the second part 12. Since the second part 12 of the heat conductor 1 performs heat exchange with the second area p2, the present embodiment is more suitable for the case where there is uncertainty in the ambient temperature of the second area p2, or the ambient temperature of the second area p2 changes in different application environments, different application time periods, etc. In addition, compared with the first embodiment, the deviation caused by the ambient temperature of the second area p2 is eliminated by direct detection, so that the detection result is more accurate.

[0076] The end of the first part 11 that performs heat exchange with the first area p1 is the head end of the first part 11, and the end of the first part 11 close to the second part 12 is the tail end of the first part 11. In this embodiment, the first temperature sensor a1 can be set at any position of the first part 11, and the third temperature sensor a3 can be set at any position of the second part 12. When the first temperature sensor a1 is set at a position far from the head end of the first part 11, the heat transferred between the first area p1 and the first part 11 of the heat conductor 1 must pass through a part of the length of the heat conductor 1 to reach the position of the first temperature sensor a1, and there is heat loss in this process. However, in the implementation application, the overall length of the heat conductor 1 is small, and this part of the heat loss is small and can be ignored.

[0077] The end of the second part 12 close to the first part 11 is the head end of the second part 12, and the end of the second part 12 that exchanges heat with the second area p2 is the tail end of the second part 12. According to the heat transfer formula, in the above formula, L 1 It should be the length of the portion of the heat conductor 1 between the first temperature sensor a1 and the third temperature sensor a3. Similarly, in practical applications, the overall length of the heat conductor 1 is small, and the length of the portion of the heat conductor 1 between the first temperature sensor a1 and the third temperature sensor a3 is slightly different from the overall length of the heat conductor 1. Therefore, L can be 1 It is approximately considered to be equal to the length of the heat conductor 1.

[0078] Of course, in this embodiment, in order to make the humidity detection of the first area p1 more accurate, it is preferred to set the first temperature sensor a1 at the head end of the first part 11 and the third temperature sensor a3 at the tail end of the second part 12, so as to reduce the heat loss from the head end of the first part 11 to the position of the first temperature sensor a1, as well as the difference between the length of the part of the heat conductor 1 between the first temperature sensor a1 and the third temperature sensor a3 and the overall length of the heat conductor 1, thereby making the calculated value of the heat transfer coefficient α more accurate.

[0079] In practical applications, if the heat conductor 1 is of equal diameter, the first temperature sensor a1 and the third temperature sensor a3 are set at any position of the heat conductor 1, and the cross-sectional areas of the heat conductor 1 are equal. In this case, the heat transfer area A 2 is equal to the cross-sectional area of ​​the heat conductor 1; if the heat conductor 1 is a variable diameter structure, then the cross-sectional area at any position of the heat conductor 1 is not equal. In this case, the heat transfer area A 2 is the equivalent cross-sectional area of ​​the portion of the heat conductor 1 between the first temperature sensor a1 to the third temperature sensor a3.

[0080] Furthermore, the second area p2 is a heat dissipation duct, and a heat dissipation fan 2 is provided in the heat dissipation duct forcibly dissipating the heat of the second portion 12 of the heat conductor 1. The method further comprises the following steps:

[0081] It is determined whether the temperature T1.2 of the second part 12 exceeds the set threshold value T0; if yes, it is determined that the cooling fan 2 is working abnormally; if no, it is determined that the cooling fan 2 is working normally.

[0082] Since in the present application, the second part 12 performs heat exchange with the second area p2, and in the entire heat conductor 1, the second part 12 is the part closest to the second area p2, so in this embodiment, the temperature T1.2 of the second part 12 is measured by the third temperature sensor a3, and then the temperature T1.2 of the second part 12 is used to determine whether the heat dissipation fan 2 located in the second area p2 is in a normal working state, thereby making the determination of the working state of the heat dissipation fan 2 more accurate. If the heat dissipation fan 2 is determined to be in a normal working state, the humidity of the first area p1 is calculated using the temperature T1.1 of the first part 11, the temperature T2 of the first area p1, and the temperature T1.2 of the second part 12.

[0083] like Figure 4 As shown, Example 3

[0084] In the present application, the temperature detection device includes a first temperature sensor a1, a second temperature sensor a2, a third temperature sensor a3 and a fourth temperature sensor a4, the heat conductor 1 also includes a third part 13 connecting the first part 11 and the second part 12, and the temperature T1 of the heat conductor 1 includes the temperature T1.1 of the first part 11, the temperature T1.3 of the connection between the third part 13 and the first part 11, and the temperature T1.4 of the connection between the third part 13 and the second part 12. That is, the humidity detection method includes the following steps:

[0085] Detecting the temperature T1.1 of the first part 11 by means of the first temperature sensor a1;

[0086] Detecting the temperature T2 of the first area p1 by the second temperature sensor a2;

[0087] The temperature T1.3 at the connection between the third part 13 and the first part 11 is detected by the third temperature sensor a3;

[0088] The temperature T1.4 at the connection between the third part 13 and the second part 12 is detected by the fourth temperature sensor a4;

[0089] The humidity of the first area p1 is calculated using the temperature T1.1 of the first portion 11 , the temperature T2 of the first region p1 , the temperature T1.3 of the connection between the third portion 13 and the first portion 11 , and the temperature T1.4 of the connection between the third portion 13 and the second portion 12 .

[0090] According to the law of conservation of energy, Q1=Q2, Q1 is the heat transferred between the first region p1 and the first part 11, Q2 is the heat transferred by the third part 13 of the heat conductor 1, and the relationship between the heat transfer coefficient and the temperature of each part is obtained as follows:

[0091] α×A 1 ×(T 2 -T 1.1 )=λ×1 / L 2 ×A 3 ×(T 1.3 -T 1.4 )

[0092] Where: α is the heat transfer coefficient of the air in the first area p1, λ is the thermal conductivity of the third part 13, A 1 is the area where heat exchange occurs between the first portion 11 and the first region p1, A 3 is the cross-sectional area of ​​the third portion 13, L 2 is the length of the third part 13, T1.1 is the temperature detected by the first temperature sensor a1, T2 is the temperature detected by the second temperature sensor a2, T1.3 is the temperature detected by the third temperature sensor a3, T1.4 is the temperature detected by the fourth temperature sensor a4, where λ, A 1 , A 3 , L 2 To determine the value, the values ​​of (T2-T1.1) and (T1.3-T1.4) can be obtained to calculate α, thereby calculating the humidity of the first area p1.

[0093] The end of the first part 11 that performs heat exchange with the first area p1 is the head end of the first part 11, and the end of the first part 11 close to the third part 13 is the tail end of the first part 11. In this embodiment, the first temperature sensor a1 can be set at any position of the first part 11. When the first temperature sensor a1 is set far away from the head end of the first part 11, the heat transferred between the first area p1 and the first part 11 of the heat conductor 1 needs to pass through a part of the length of the heat conductor 1 to reach the location of the first temperature sensor a1, and there is heat loss in this process. However, in the implementation application, the overall length of the heat conductor 1 is small, and this part of the heat loss is small and can be ignored.

[0094] Of course, in this embodiment, in order to make the humidity detection of the first area p1 more accurate, it is preferred to set the first temperature sensor a1 at the head end of the first part 11, so as to reduce the heat loss from the first part 11 and the head end of the first area p1 to the position of the first temperature sensor a1, thereby making the calculated value of the heat transfer coefficient α more accurate and the calculated humidity result more accurate.

[0095] In the above formula, compared with the first and second embodiments, L1 is approximately equal to the length of the heat conductor 1, the actual L 1 There is a certain error between the length of the heat conductor 1 and L 2 It is equal to the length of the third part 13 and is an accurate value. Therefore, it can be foreseen that the calculated value of the heat transfer coefficient α in this embodiment is more accurate and the calculated humidity structure will be more precise.

[0096] In practical applications, if the heat conductor 1 is of equal diameter, the cross-sectional area at any position of the heat conductor 1 is equal. In this case, the heat transfer area A 3 Equal to the cross-sectional area of ​​the third portion 13, i.e. A 3 If the heat conductor 1 is a variable diameter structure, the cross-sectional area of ​​the heat conductor 1 at any position is not equal, that is, the cross-sectional area of ​​the third part 13 at any position is not equal. In this case, the heat transfer area A 3 is the equivalent cross-sectional area of ​​the third portion 13.

[0097] Furthermore, the second area p2 is a heat dissipation duct, and a heat dissipation fan 2 is provided in the heat dissipation duct forcibly dissipating the heat from the second portion 12 of the heat conductor 1. The detection method further comprises the following steps:

[0098] It is determined whether the temperature T1.4 at the connection point between the third part 13 and the second part 12 exceeds the set threshold value T0; if yes, it is determined that the cooling fan 2 is working abnormally; if not, it is determined that the cooling fan 2 is working normally.

[0099] Since in the present application, the second part 12 and the second area p2 perform heat exchange, in this embodiment, the fourth temperature sensor a4 used to detect the temperature at the connection between the third part 13 and the second part 12 is the temperature sensor closest to the second area p2, so in this embodiment, the temperature T1.4 at the connection between the third part 13 and the second part 12 is measured by the fourth temperature sensor a4, and then the temperature T1.4 at the connection between the third part 13 and the second part 12 is used to determine whether the heat dissipation fan 2 located in the second area p2 is in a normal working state, thereby making the determination of the working state of the heat dissipation fan 2 more accurate. If the heat dissipation fan 2 is determined to be in a normal working state, the humidity of the first area p1 is calculated using the temperature T1.1 of the first part 11, the temperature T2 of the first area p1, the temperature T1.3 at the connection between the third part 13 and the first part 11, and the temperature T1.4 at the connection between the third part 13 and the second part 12.

[0100] In the first and second embodiments, λ is the heat transfer coefficient of the heat conductor 1, and in the third embodiment, λ is the heat transfer coefficient of the third portion 13. Since λ is only related to the material itself, the first portion 11, the second portion 12 and the third portion 13 of the heat conductor 1 are an integrated structure with the same material. Therefore, in the first, second and third embodiments, λ is the heat transfer coefficient of the heat conductor 1, which is determined by the material of the heat conductor 1.

[0101] In the implementation case of this method, refer to Figure 6 The heat conductor 1 is provided with a mounting hole 15, and the mounting hole 15 forms an opening 16 on the surface of the heat conductor 1. At least one temperature measuring resistor 17 is arranged in the mounting hole 15, and the temperature measuring resistor 17 is connected to a circuit 171, which is led out of the heat conductor 1 through the opening 16 of the mounting hole 15.

[0102] A protective housing 18 is provided outside the temperature measuring resistor 17, and the protective housing 18 plays a role of limiting protection for the temperature measuring resistor 17 to ensure its function of detecting temperature. The protective housing 18 includes at least two split structures, which are assembled to form a complete protective housing 18. At least one split structure is provided with a receiving groove to form an assembly space for accommodating the temperature measuring resistor 17. During assembly, the temperature measuring resistor 17 is first embedded in the receiving groove, and then the split structures are assembled into the protective housing 18, so that the assembly of the temperature measuring resistor 17 is more convenient.

[0103] In the first embodiment, a temperature measuring resistor 17 is disposed in the mounting hole 15 of the heat conductor 1 to form a first temperature sensor a1.

[0104] In the second embodiment, two temperature measuring resistors 17 are arranged in the mounting hole 15 of the heat conductor 1, wherein one of the temperature measuring resistors 17 corresponds to the first part 11 of the heat conductor 1 at the position of the mounting hole 15, that is, forming a first temperature sensor a1, and the other temperature measuring resistor 17 corresponds to the second part 12 of the heat conductor 1 at the position of the mounting hole 15, that is, forming a third temperature sensor a3.

[0105] In embodiment three, three temperature measuring resistors 17 are arranged in the mounting hole 15. The positions of the three temperature measuring resistors 17 in the mounting hole 15 respectively correspond to the first part 11, the connection between the third part 13 and the first part 11, and the connection between the third part 13 and the second part 12, that is, the first temperature sensor a1, the third temperature sensor a3, and the fourth temperature sensor a4 are formed respectively.

[0106] The heat conductor 1 in the implementation case of the present method is provided with a heat dissipation structure in its second portion 12 , and the heat dissipation structure can increase the heat exchange area between the second portion 12 and the second region p2 of the heat conductor 1 , thereby enhancing the heat dissipation effect of the second portion 12 .

[0107] In the first embodiment of the heat dissipation structure, refer to Figure 7 The heat dissipation structure includes a plurality of heat dissipation fins 121 arranged at intervals from each other, and the heat dissipation fins 121 are connected to the heat conductor 1. In the second embodiment of the heat dissipation structure, refer to Figure 8 The heat dissipation structure includes a plurality of heat dissipation rings 122 spaced apart from each other, and the heat dissipation rings 122 are sleeved on the heat conductor 1. The heat dissipation fins 121 or the heat dissipation rings 122 can be fixedly connected to the heat conductor 1 by welding or fasteners, or can be set as an integral structure with the heat conductor 1.

[0108] This embodiment also provides a cooking device, including a processor, and the processor is used to execute the steps of the above humidity detection method.

[0109] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A humidity detection method, characterized in that: The method comprises the following steps, The temperature T1 of the heat conductor and the temperature T2 of the first region are detected by a temperature detection device, respectively, wherein the heat conductor includes a first part and a second part, the first part performs heat exchange with the first region, and the second part performs heat exchange with the second region; The humidity of the first area is calculated using the temperature T1 of the heat conductor and the temperature T2 of the first area.

2. A humidity detection method according to claim 1, characterized in that: The humidity of the first area is calculated using the temperature T1 of the heat conductor and the temperature T2 of the first area, including calculating the heat transfer coefficient α of the steam-air mixture using T1 and T2, and then inferring the humidity of the first area through the relationship between the heat transfer coefficient α and the humidity.

3. A humidity detection method according to claim 2, characterized in that: The temperature detection device includes a first temperature sensor and a second temperature sensor. The first temperature sensor detects the temperature T1 of the heat conductor, and the second temperature sensor detects the temperature T2 of the first area. The environment of the second part is room temperature. The relationship between the heat transfer coefficient α and the temperature of each part is as follows: α×A1×(T2-T1)=λ×1 / L1×A2×(T1-T 室温 ) Wherein: λ is the thermal conductivity of the heat conductor, which is related to the material itself; α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated according to the value of α; A1 is the area where heat exchange occurs between the first part and the first area, which is a design-determined value; L1 is the length of the heat conductor, which is a design-determined value; A2 is the cross-sectional area of ​​the heat conductor, which is a design-determined value; T 室温 is the temperature of the current environment, which is a fixed value.

4. A humidity detection method according to claim 3, characterized in that: The second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps: Determine whether the temperature T1 of the heat conductor exceeds a set threshold T0; If yes, it is determined that the cooling fan is working abnormally; if no, it is determined that the cooling fan is working normally.

5. A humidity detection method according to claim 2, characterized in that: The temperature detection device includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The temperature T1 of the heat conductor includes the temperature T1.1 of the first part and the temperature T1.2 of the second part. The first temperature sensor detects the temperature T1.1 of the first part, the second temperature sensor detects the temperature T2 of the first area, and the third temperature sensor detects the temperature T1.2 of the second part. The relationship between the heat transfer coefficient α and the temperature of each part is as follows: α×A1×(T2-T 1.1 )=λ×1 / L1×A2×(T 1.1 -T 1.2 ) In the formula: λ is the thermal conductivity of the heat conductor, which is related to the material itself; α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated according to the value of α; A1 is the area where heat exchange occurs between the first part and the first area, which is a design-determined value; L1 is the length of the heat conductor, which is a design-determined value; A2 is the cross-sectional area of ​​the heat conductor, which is a design-determined value.

6. A humidity detection method according to claim 5, characterized in that: The second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps: It is determined whether the temperature T1.2 of the second part exceeds a set threshold value T0; if yes, it is determined that the cooling fan is operating abnormally; if no, it is determined that the cooling fan is operating normally.

7. A humidity detection method according to claim 2, characterized in that: The temperature detection device includes a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor. The heat conductor also includes a third part connecting the first part and the second part. The temperature T1 of the heat conductor includes the temperature T1.1 of the first part, the temperature T1.3 of the connection between the third part and the first part, and the temperature T1.4 of the connection between the third part and the second part. The first temperature sensor detects the temperature T1.1 of the first part, the second temperature sensor detects the temperature T2 of the first area, the third temperature sensor detects the temperature T1.3 of the connection between the third part and the first part, and the fourth temperature sensor detects the temperature T1.4 of the connection between the third part and the second part. The relationship between the heat transfer coefficient α and the temperature of each part is as follows: α×A1×(T2-T 1.1 )=λ×1 / L2×A3×(T 1.3 -T 1.4 ) In the formula: α is the heat transfer coefficient of the steam-air mixture, and its value is related to the proportion of steam in the steam-air mixture. The humidity of the first area can be calculated according to the value of α; λ is the thermal conductivity of the third part, which is related to the material itself; A1 is the area where heat exchange occurs between the first part and the first area, which is a design-determined value; A3 is the cross-sectional area of ​​the third part, which is a design-determined value; L2 is the length of the third part, which is a design-determined value.

8. A humidity detection method according to claim 7, characterized in that: The second area is a heat dissipation duct, and a heat dissipation fan for forcibly dissipating heat from the second part of the heat conductor is provided in the heat dissipation duct. The method further comprises the following steps: Determine whether the temperature T1.4 at the connection point between the third part and the second part exceeds a set threshold value T0; If yes, it is determined that the cooling fan is working abnormally; if no, it is determined that the cooling fan is working normally.

9. A humidity detection method according to claim 1, characterized in that: The method further comprises the following steps: Determine whether the temperature T2 of the first area is within the applicable temperature range [T2min, T2max], and whether the interval [T2min, T2max] includes and is greater than the settable operating temperature range of the cooking device; if not, determine that the cooking device is operating at a fault; if yes, determine that the cooking device is operating normally.

10. A cooking device, characterized in that: The cooking device comprises a processor; the processor is used to execute the steps of the humidity detection method according to any one of claims 1-9.

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