Automatic cooking machine humidity measuring device, automatic cooking machine and humidity control method

Abstract

The present invention discloses an automatic cooking machine humidity measuring device, an automatic cooking machine and a humidity control method. The automatic cooking machine humidity measuring device comprises a humidity sensor arranged in an air intake passage and a control component electrically connected to the humidity sensor, wherein the control component is used to calculate the humidity in the cooking cavity for multiple times, and each time the humidity in the cooking cavity is calculated, the calculation is performed based on the humidity in the cooking cavity calculated last time combined with the real-time humidity measured by the humidity sensor. The humidity in the cooking cavity is indirectly measured by the humidity sensor arranged in the air intake passage. Since the air intake passage is outside the cooking cavity and has a relatively low temperature, and is not in the high temperature environment in the cooking cavity for a long time, an ordinary humidity sensor can be used, which reduces the cost and solves the defect that the humidity sensor in the existing solution cannot work for a long time under high temperature.

Description

Technical Field

[0001] The invention relates to the field of automatic cooking, and in particular to a humidity measuring device for an automatic cooking machine, an automatic cooking machine and a humidity control method. Background Art

[0002] When cooking some dishes, it is sometimes necessary to speed up the evaporation of liquid, such as to collect juice. If the humidity inside the cooking cavity is too high, the evaporation of liquid will be slowed down. If the dish is cooked for too long, it will affect the taste. At this time, the humidity in the cooking cavity needs to be lowered.

[0003] The existing humidity adjustment scheme is to measure the humidity in the cooking cavity by a humidity sensor in the cooking cavity, and then adjust the humidity by adjusting the power of the heating device and the flow rate of the exhaust device based on the measured humidity.

[0004] However, this solution has the following defects: the existing humidity sensor cannot work in an environment of 100°C for a long time. Therefore, a special humidity sensor with a relatively high price must be used, which increases the cost. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that humidity sensors cannot work at high temperatures for a long time, and to provide an automatic cooking machine humidity measuring device, an automatic cooking machine and a humidity control method.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A humidity measuring device for an automatic cooking machine, the automatic cooking machine is provided with a cooking cavity and an air intake passage connected to the cooking cavity, the humidity measuring device comprises a humidity sensor arranged in the air intake passage and a control component electrically connected to the humidity sensor, the control component is used to calculate the humidity in the cooking cavity multiple times, and each time the humidity in the cooking cavity is calculated, the calculation is performed based on the humidity in the cooking cavity calculated last time combined with the real-time humidity measured by the humidity sensor.

[0008] The present invention indirectly measures the humidity in the cooking cavity by means of a humidity sensor disposed in the air intake passage. Since the air intake passage is located outside the cooking cavity and has a relatively low temperature, and is not exposed to the high temperature environment of the cooking cavity for a long time, an ordinary humidity sensor can be used, thereby reducing the cost and solving the defect that the humidity sensor of the existing solution cannot work for a long time under high temperature.

[0009] Preferably, the initial humidity in the cooking cavity is the humidity initially measured by the humidity sensor. The control component uses the initial humidity as an initial value to perform iterative calculation to obtain the real-time humidity in the cooking cavity.

[0010] Preferably, the control component is also electrically connected to a heating device for heating the cooking cavity and an exhaust device for exhausting air from the cooking cavity, and the control component includes:

[0011] a first calculation module, configured to obtain the moisture content of the first gas sucked into the cooking cavity according to the real-time humidity measured by the humidity sensor and the operating parameters of the exhaust device;

[0012] A second calculation module is used to obtain the water content of the second gas in the cooking cavity when the exhaust device is running according to the last humidity in the cooking cavity, the volume of the cooking cavity and the operating parameters of the exhaust device;

[0013] A third calculation module, used for obtaining the water content of the third gas generated by heating according to the operating parameters of the heating device;

[0014] The fourth calculation module is used to calculate the current humidity in the cooking cavity according to the first gas water content, the second gas water content, the third gas water content and the volume of the cooking cavity.

[0015] The humidity in the cooking cavity is indirectly obtained by respectively calculating the moisture content of the inhaled gas, the residual moisture content in the cooking cavity, and the moisture content of the gas generated by heating.

[0016] Preferably, the first gas water content m1 satisfies the following formula:

[0017]

[0018] Wherein, t is the operation time of the exhaust device, ν is the air flow rate when the exhaust device is working, is the humidity in the air intake passage, ρ wmax is the maximum absolute humidity under the outside temperature T, and the outside temperature T is measured by the first temperature sensor arranged in the air intake passage.

[0019] Preferably, the second gas moisture content is obtained by subtracting the exhaust gas moisture content from the original gas moisture content in the cooking chamber, and the original gas moisture content m i Satisfies the following formula:

[0020]

[0021] in: is the last humidity in the cooking chamber, ρ wmax0 is the highest absolute humidity at the last temperature T0 in the cooking cavity, T0 is measured by a second temperature sensor disposed in the cooking cavity, and V is the volume of the cooking cavity;

[0022] The moisture content of the exhaust gas satisfies the following formula:

[0023]

[0024] Where: ν is the air flow rate when the exhaust device is working;

[0025] The second gas water content m2 satisfies the following formula:

[0026]

[0027] Preferably, the third gas water content m3 satisfies the following formula:

[0028]

[0029] Where: m is the amount of water vapor generated by the heating device per unit time, and t is the operating time of the heating device.

[0030] Preferably, the humidity in the cooking cavity is Satisfies the following formula:

[0031]

[0032] Wherein, m1 is the water content of the first gas, m2 is the water content of the second gas, m3 is the water content of the third gas, V is the volume of the cooking cavity, ρ wmax1 is the maximum absolute humidity at the current temperature T1 of the cooking cavity, T1 is measured by the second temperature sensor arranged in the cooking cavity, and δ is the air mixing coefficient in the cooking machine.

[0033] The present invention also provides an automatic cooking machine, comprising a cooking cavity, an air intake passage connected to the cooking cavity, an exhaust device connected to the cooking cavity, a heating device for heating the cooking cavity, and the automatic cooking machine humidity measuring device as described above.

[0034] Preferably, the automatic cooking machine further comprises a cover assembly for opening or closing the air inlet passage, and the control assembly is electrically connected to the cover assembly to control the opening range of the cover assembly relative to the air inlet passage.

[0035] The present invention also provides a humidity control method, which is applicable to the automatic cooking machine as described above, and is characterized in that it comprises the following steps:

[0036] S1: Determine the target humidity;

[0037] S2: obtaining the real-time humidity in the cooking cavity measured by the humidity measuring device of the automatic cooking machine;

[0038] S3: Compare the real-time humidity in the cooking cavity with the target humidity, and adjust the operating parameters of the heating device and the exhaust device according to the comparison result to keep the real-time humidity consistent with the target humidity.

[0039] Preferably, a control method is applicable to an automatic cooking machine including a cover assembly, the cover assembly being used to open or close an air intake passage, wherein step S3 further comprises: adjusting the opening amplitude of the cover assembly relative to the air intake passage according to the comparison result.

[0040] Preferably, in step S3, the adjustment of the heating device, the exhaust device and the cover assembly includes:

[0041] If the real-time humidity is lower than the target humidity, the heating power of the heating device is increased, and / or the opening range of the cover assembly is reduced, and / or the air flow rate of the exhaust device is reduced;

[0042] If the real-time humidity is greater than the target humidity, the heating power of the heating device is reduced, and / or the opening range of the cover assembly is increased, and / or the air flow of the exhaust device is increased.

[0043] The positive and progressive effects of the present invention are:

[0044] The humidity in the cooking cavity is indirectly measured by a humidity sensor arranged in the air intake passage. Since the air intake passage is outside the cooking cavity and has a lower temperature, and is not in the high temperature environment of the cooking cavity for a long time, an ordinary humidity sensor can be used, which reduces the cost and solves the defect that the humidity sensor of the existing solution cannot work for a long time under high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a cross-sectional view of a cooking machine;

[0046] Figure 2 for Figure 1 A partial enlarged view of part A;

[0047] Figure 3 The electrical block diagram of the humidity sensor and control components;

[0048] Figure 4 is a flow chart of the humidity control method;

[0049] Figure 5 A detailed process view of the humidity control method;

[0050] Description of reference numerals:

[0051] Cooking cabinet 100

[0052] Second temperature sensor 110

[0053] Heating device 200

[0054] Intake channel 300

[0055] Humidity Sensor 310

[0056] First temperature sensor 320

[0057] Exhaust channel 400

[0058] Cover assembly 500

[0059] Control Components 600 DETAILED DESCRIPTION

[0060] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0061] This embodiment provides an automatic cooking machine humidity measuring device, which can be used to measure the humidity in the cooking cavity 100 when the cooking machine is working.

[0062] The automatic cooking machine structure to which the humidity measuring device of the present invention is applicable is as follows Figure 1 and Figure 2 As shown, it includes a cooking cavity 100 arranged in a shell, a heating device 200 arranged at the bottom of the cooking cavity 100 to heat the cooking cavity 100, an air intake channel 300 connecting the cooking cavity 100 with the outside, an exhaust channel 400 connecting the cooking cavity 100 with the outside, and an exhaust device arranged in the exhaust channel 400, which is used to exhaust air to the outside to take out the smoke in the cooking cavity 100.

[0063] Recombination Figure 1 , Figure 2 and Figure 3 The humidity measuring device includes a humidity sensor 310 disposed in an air inlet passage 300 and a control component 600 electrically connected to the humidity sensor 310. The control component is used to calculate the humidity in the cooking cavity multiple times, and each time the humidity in the cooking cavity is calculated, the calculation is performed based on the last calculated humidity in the cooking cavity combined with the real-time humidity measured by the humidity sensor.

[0064] Specifically, the humidity in the current cooking cavity 100 is calculated by combining the humidity in the cooking cavity 100 calculated last time with the humidity in the air inlet passage 300 measured by the current humidity sensor 310, and the humidity in the cooking cavity 100 is calculated each time in this way.

[0065] The humidity in the cooking cavity 100 is indirectly measured by a humidity sensor 310 arranged in the air intake channel 300. Since the air intake channel 300 is located outside the cooking cavity 100 and has a lower temperature, and is not in the high temperature environment of the cooking cavity 100 for a long time, an ordinary humidity sensor 310 can be used, which reduces the cost and solves the defect that the humidity sensor 310 of the existing solution cannot work for a long time under high temperature.

[0066] In this embodiment, the initial humidity in the cooking cavity 100 is the humidity initially measured by the humidity sensor 310, and the control component 600 uses the initial humidity as the initial value to perform iterative calculation to obtain the real-time humidity in the cooking cavity 100. The advantage is that when the cooking machine starts working, the humidity in the cavity is basically consistent with the external ambient humidity, and no excessive errors are introduced, so that the subsequent calculation accuracy can be guaranteed.

[0067] In this embodiment, the control component 600 is connected to the heating device 200 and the exhaust device, and the control component 600 includes:

[0068] A receiving module, used to receive the operating parameters of the exhaust device and the heating device 200 and the real-time humidity measured by the humidity sensor 310;

[0069] The first calculation module is used to obtain the moisture content m1 of the first gas sucked into the cooking cavity 100 according to the humidity measured in real time by the sensor and the operating parameters of the exhaust device. The specific calculation formula is as follows:

[0070]

[0071] Wherein, t is the operation time of the exhaust device, ν is the air flow rate when the exhaust device is working, and the air flow rate is obtained by multiplying the flow rate of the exhaust device by the cross-sectional area of ​​the air inlet passage 300, is the humidity in the air intake passage 300, ρ wmax is the maximum absolute humidity at an outside temperature T, where the outside temperature T is measured by a first temperature sensor 320 disposed in the air intake passage 300;

[0072] The second calculation module is used to obtain the second gas moisture content m2 in the cooking cavity 100 when the exhaust device is running according to the last humidity in the cooking cavity 100, the volume of the cooking cavity 100 and the operating parameters of the exhaust device. The second gas moisture content m2 is calculated by the original moisture content m in the cooking cavity 100. i Subtract the moisture content m discharged to the outside of the cooking chamber 100 e The specific calculation formula is as follows:

[0073]

[0074] in: is the last humidity in the cooking cavity 100, ρ wmax0 is the highest absolute humidity at the last temperature T0 in the cooking cavity 100, where T0 is measured by the second temperature sensor 110 disposed in the cooking cavity 100, V is the volume of the cooking cavity 100, and ν is the air flow rate when the exhaust device is working, which is obtained by multiplying the rotation speed of the exhaust device by the cross-sectional area of ​​the exhaust passage 400;

[0075] The third calculation module is used to obtain the water content m3 of the third gas generated by heating according to the operating parameters of the heating device 200. The specific calculation formula is as follows:

[0076]

[0077] Wherein: m is the amount of water vapor generated by the heating device 200 per unit time, and t is the operating time of the heating device 200.

[0078] The fourth calculation module is used to calculate the current humidity in the cooking cavity 100 according to the first gas moisture content, the second gas moisture content, the third gas moisture content and the volume of the cooking cavity 100. The specific calculation formula is as follows:

[0079]

[0080] Wherein, m1 is the water content of the first gas, m2 is the water content of the second gas, m3 is the water content of the third gas, V is the volume of the cooking cavity 100, and ρ wmax1 is the maximum absolute humidity at the current temperature T1 of the cooking cavity 100, T1 is measured by the second temperature sensor 110 disposed in the cooking cavity 100, and δ is the air mixing coefficient in the cooking machine.

[0081] It should be noted that, in the present invention, the operating order of the first calculation module, the second calculation module and the third calculation module can be set arbitrarily, and the fourth calculation module needs to start calculation only after the first calculation module, the second calculation module and the third calculation module obtain the corresponding moisture content data.

[0082] In this embodiment, the time t0 corresponding to the last humidity and the time t1 corresponding to the current humidity satisfy the following formula:

[0083] 3s≤t1-t0≤5s.

[0084] That is, the humidity is calculated once every 3 to 5 seconds. The reason for adopting the above setting is that the calculation of the humidity in the present invention includes the step of integrating the last humidity with the operating time. The last humidity is a constant value in the integral time period, but in actual situations, the last humidity is a constantly fluctuating value rather than a constant value, thereby introducing errors. The present invention reduces the duration of the integral time period by setting the interval between two calculations to 3 to 5 seconds, and the humidity will not fluctuate too much, thereby not introducing too many errors. In addition, the calculation frequency of 3 to 5 seconds is relatively moderate, and will not occupy too many computing resources. There is no need to use a high-performance control component 600, which is conducive to cost control.

[0085] In this embodiment, the operation time t of the heating device 200 and the exhaust device is consistent with the time difference between the moment t0 and the moment t1 corresponding to the current humidity. That is to say, in the process of calculating the current humidity based on the previous humidity, the heating device 200 and the exhaust device always operate in a constant state, which can be a working state or a static state. This can simplify the calculation steps and save computing resources. The adjustment of the operating parameters of the heating device 200 and the exhaust device is performed when the previous calculation ends and the current calculation begins.

[0086] like Figure 1 and Figure 2 As shown, the present invention also provides an automatic cooking machine, including a cooking cavity 100 arranged in a shell, a heating device 200 arranged at the bottom of the cooking cavity 100 to heat the cooking cavity 100, an air intake channel 300 connecting the cooking cavity 100 with the outside, an exhaust channel 400 connecting the cooking cavity 100 with the outside, an exhaust device arranged in the exhaust channel 400, and the automatic cooking machine humidity measuring device as described above.

[0087] The inlet of the air inlet passage 300 is provided with a cover assembly 500 for opening or closing the air inlet passage 300. The air inlet passage 300 is closed by the cover assembly 500 to seal the cooking cavity 100 to prevent moisture from leaking from the cooking cavity 100. The air inlet passage 300 is opened by the cover assembly 500 to replenish air to the cooking cavity 100 when the exhaust device is running, so that the exhaust operation can proceed normally.

[0088] The control assembly 600 is connected to the cover assembly 500 and is used to control the opening range of the cover assembly 500 relative to the air inlet passage 300. The advantage of adopting this solution is that the air flow of the exhaust device can be adjusted more precisely.

[0089] like Figure 4 As shown, the present invention also provides a humidity control method, which is applicable to the automatic cooking machine mentioned above, and comprises the following steps:

[0090] S1: Determine the target humidity;

[0091] S2: obtaining the real-time humidity in the cooking cavity 100 measured by the humidity measuring device of the automatic cooking machine of the cooking cavity 100;

[0092] S3: Compare the real-time humidity in the cooking cavity 100 with the target humidity, and adjust the operating parameters of the heating device 200 and the exhaust device according to the comparison result to keep the real-time humidity consistent with the target humidity.

[0093] For the automatic cooking machine including the cover assembly 500, step S3 further includes: adjusting the opening width of the cover assembly 500 relative to the air inlet passage 300 according to the comparison result.

[0094] In this embodiment, the adjustment of the heating device 200, the exhaust device and the cover assembly 500 specifically includes:

[0095] If the real-time humidity is lower than the target humidity, the heating power of the heating device 200 is increased, and / or the opening range of the cover assembly 500 is reduced, and / or the air flow rate of the exhaust device is reduced;

[0096] If the real-time humidity is greater than the target humidity, the heating power of the heating device 200 is reduced, and / or the opening range of the cover assembly 500 is increased, and / or the air flow of the exhaust device is increased.

[0097] Figure 5 This is a specific process diagram of the present invention; it specifically includes the following steps:

[0098] Enter the recipe;

[0099] Get the target humidity according to the recipe;

[0100] Get the humidity and temperature of the air intake passage;

[0101] Obtaining initial humidity and temperature in the cooking cavity;

[0102] Adjust the operating parameters of the heating device and the exhaust device to obtain a new humidity value after a period of time T has passed;

[0103] Determine whether the new humidity value is consistent with the target humidity. If so, continue cooking until cooking is completed. If not, multiply the humidity by an optimization coefficient δ, and then adjust the heating power of the heating device, the exhaust volume of the exhaust device, and the opening width of the cover assembly according to the optimized humidity;

[0104] After time T has passed, a new humidity value is obtained and the previous step is performed again.

[0105] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the scope of protection of the present invention.

Claims

1. A humidity measuring device for an automatic cooking machine, the automatic cooking machine being provided with a cooking cavity and an air inlet passage communicating with the cooking cavity, Features: The humidity measuring device comprises a humidity sensor disposed in the air inlet passage and a control component electrically connected to the humidity sensor, wherein the control component is used to calculate the humidity in the cooking cavity multiple times, and each time the humidity in the cooking cavity is calculated, the calculation is performed based on the humidity in the cooking cavity calculated last time combined with the real-time humidity measured by the humidity sensor; The initial humidity in the cooking cavity is the humidity initially measured by the humidity sensor; The control component is also electrically connected to a heating device for heating the cooking cavity and an exhaust device for exhausting air from the cooking cavity. The control component includes: a first calculation module, configured to obtain the moisture content of the first gas sucked into the cooking cavity according to the real-time humidity measured by the humidity sensor and the operating parameters of the exhaust device; A second calculation module is used to obtain the water content of the second gas in the cooking cavity when the exhaust device is running according to the last humidity in the cooking cavity, the volume of the cooking cavity and the operating parameters of the exhaust device; A third calculation module, used for obtaining the water content of the third gas generated by heating according to the operating parameters of the heating device; The fourth calculation module is used to calculate the current humidity in the cooking cavity according to the first gas water content, the second gas water content, the third gas water content and the volume of the cooking cavity.

2. The humidity measuring device for an automatic cooking machine according to claim 1, Features: The first gas water content m 1 Satisfies the following formula: m 1 = Where t is the operation time of the exhaust device, is the air flow rate when the exhaust device is working, is the humidity in the air intake passage, is the maximum absolute humidity under the outside temperature T, and the outside temperature T is measured by the first temperature sensor arranged in the air intake passage.

3. The humidity measuring device for an automatic cooking machine according to claim 1, Features: The second gas moisture content is obtained by subtracting the exhaust gas moisture content from the original gas moisture content in the cooking chamber. i Satisfies the following formula: m i = in: is the last humidity in the cooking cavity, is the last temperature T in the cooking chamber 0 The maximum absolute humidity, T 0 is measured by a second temperature sensor disposed in the cooking cavity, and V is the volume of the cooking cavity; The moisture content of the exhaust gas satisfies the following formula: m e = in: The air flow rate when the exhaust device is working; The water content of the second gas m 2 Satisfies the following formula: m 2 = m i -m e = 。 4. The humidity measuring device for an automatic cooking machine according to claim 1, Features: The third gas water content m 3 Satisfies the following formula: m 3 = Wherein: m is the amount of water vapor generated by the heating device per unit time, and t is the operating time of the heating device.

5. The humidity measuring device for an automatic cooking machine according to claim 1, Features: The humidity in the cooking cabinet Satisfies the following formula: Among them, m 1 is the water content of the first gas, m 2 is the water content of the second gas, m 3 is the moisture content of the third gas, V is the volume of the cooking cavity, is the current temperature of the cooking chamber T 1 The maximum absolute humidity, T 1 It is measured by the second temperature sensor arranged in the cooking cavity, and δ is the air mixing coefficient in the cooking machine.

6. An automatic cooking machine, Features: It comprises a cooking cavity, an air inlet passage connected to the cooking cavity, an exhaust device connected to the cooking cavity, a heating device for heating the cooking cavity, and the humidity measuring device of the automatic cooking machine as claimed in any one of claims 1 to 5.

7. The automatic cooking machine according to claim 6, Features: The automatic cooking machine further comprises a cover assembly for opening or closing the air inlet passage, and a control assembly is electrically connected to the cover assembly to control the opening range of the cover assembly relative to the air inlet passage.

8. A humidity control method, applicable to the automatic cooking machine as claimed in claim 6 or 7, Features: The steps include: S1: Determine the target humidity; S2: obtaining the real-time humidity in the cooking cavity measured by the humidity measuring device of the automatic cooking machine; S3: comparing the real-time humidity in the cooking cavity with the target humidity, and adjusting the operating parameters of the heating device and the exhaust device according to the comparison result to keep the real-time humidity consistent with the target humidity.

9. The humidity control method according to claim 8, Features: Suitable for an automatic cooking machine including a cover assembly, wherein the cover assembly is used to open or close the air intake passage, wherein step S3 further comprises: adjusting the opening amplitude of the cover assembly relative to the air intake passage according to the comparison result.

10. The humidity control method according to claim 9, Features: In step S3, the adjustment of the heating device, the exhaust device and the cover assembly includes: If the real-time humidity is lower than the target humidity, the heating power of the heating device is increased, and / or the opening range of the cover assembly is reduced, and / or the air flow rate of the exhaust device is reduced; If the real-time humidity is greater than the target humidity, the heating power of the heating device is reduced, and / or the opening range of the cover assembly is increased, and / or the air flow of the exhaust device is increased.

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