Cooking machine pressure and humidity control device and automatic cooking machine

Abstract

The present invention discloses a pressure and humidity control device for a cooking machine and an automatic cooking machine. The pressure and humidity control device for a cooking machine comprises a heating device for heating a cooking cavity in the cooking machine, an exhaust device for exhausting the cooking cavity, and a sensor group for measuring status data of the cooking cavity and the exhaust device. The sensor group, the heating device and the exhaust device are connected to a control component. The control component is used to adjust the operating parameters of the heating device and the exhaust device according to the status data to control the cooking parameters in the cooking cavity, and the cooking parameters include pressure and / or humidity. The control component can realize linear adjustment of humidity by controlling the operating parameters of the heating device and the exhaust device, so that the pressure and / or humidity in the pot reach the expected target pressure and humidity, thereby improving the cooking effect.

Description

Technical Field

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

[0002] Existing cooking machines mainly control the heating temperature and time to complete the cooking process of various dishes. However, the cooking process of dishes is not only related to temperature and time, but also to pressure and humidity during the cooking process.

[0003] The existing cooking machine regulates the humidity and pressure during the cooking process mainly by opening and closing the lid of the cooking machine to adjust the humidity and pressure in the pot.

[0004] The above scheme has the following defects:

[0005] The existing cooking machine has only two states, either the lid is closed or the lid is open, and the humidity and pressure in the pot cannot be adjusted linearly, so that the humidity and pressure in the pot cannot meet the requirements for cooking, resulting in poor cooking effects. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the humidity and pressure in the pot cannot be linearly adjusted, and to provide a cooking machine pressure and humidity control device and an automatic cooking machine.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A pressure and humidity control device for a cooking machine, comprising a heating device for heating a cooking cavity in the cooking machine, an exhaust device for exhausting the cooking cavity, and a sensor group for measuring status data of the cooking cavity and the exhaust device, wherein the sensor group, the heating device and the exhaust device are connected to a control component, and the control component is used to adjust the operating parameters of the heating device and the exhaust device according to the status data to control the cooking parameters in the cooking cavity, wherein the cooking parameters include pressure and / or humidity.

[0009] The control component can adjust the pressure and / or humidity by controlling the operating parameters of the heating device and the exhaust device, so that the pressure and / or humidity in the pot reaches the expected target pressure and / or humidity, thereby improving the cooking effect.

[0010] Preferably, the status data includes the real-time pressure in the cooking cavity, and the control component is used to compare the real-time pressure and the target pressure, and when the real-time pressure is lower than the target pressure, the heating power of the heating device is increased and / or the exhaust volume of the exhaust device is reduced; when the real-time pressure is higher than the target pressure, the heating power of the heating device is reduced and / or the exhaust volume of the exhaust device is increased.

[0011] Thus, the control component can adjust the pressure in the cooking cavity in real time so that the real-time pressure approaches the target pressure, so that the cooking cavity can maintain a stable and accurate pressure and / or humidity.

[0012] Preferably, the control component is used to calculate the expected pressure in the cooking cavity after a preset time period based on the status data and the operating parameters of the heating device and the exhaust device, and make the expected pressure consistent with the target pressure by adjusting the operating parameters.

[0013] In this way, the heating device and the exhaust device can maintain the existing operating state before reaching the target pressure. There is no need to frequently adjust the heating device and the exhaust device, which is beneficial to increasing the service life of the heating device and the exhaust device, and can improve the pressure and / or humidity regulation efficiency to a certain extent.

[0014] Preferably, the control component includes a first calculation module, which is used to obtain the original gas mass in the cooking cavity according to the status data and the operating parameters; the first gas mass discharged out of the cooking cavity; the second gas mass inhaled into the cooking cavity; the third gas mass generated by heating, and calculate the expected pressure based on the original gas mass, the first gas mass, the second gas mass and the third gas mass.

[0015] The predicted pressure in the cooking cavity after a preset time period is obtained by calculating the change in the amount of gas in the cooking cavity.

[0016] Preferably, the exhaust device includes an air intake channel and an exhaust channel connecting the cooking cavity, and also includes a cover assembly for controlling the opening and closing of the air intake channel and a fan arranged in the exhaust channel. The operating parameters of the exhaust device include the opening width of the cover assembly relative to the air intake channel and the rotation speed of the fan. The operating parameters of the heating device include the heating power. The status data include the temperature, pressure and air flow rate in the air intake channel, the air flow rate in the exhaust channel and the temperature and pressure in the cooking cavity.

[0017] Preferably, the status data includes the humidity in the air intake channel connected to the cooking cavity, and 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, it is calculated based on the last calculated humidity in the cooking cavity combined with the humidity in the air intake channel.

[0018] The humidity in the cooking cavity is indirectly measured through the humidity in the air intake passage, so that the humidity sensor in the cooking cavity can be removed, which solves the defect that the existing conventional humidity sensor cannot work at 100°C for a long time, improves reliability and reduces cost.

[0019] Preferably, the initial humidity in the cooking cavity is the humidity in the air inlet passage.

[0020] Preferably, the control component includes a second calculation module, which calculates the original gas moisture content in the cooking cavity, the first gas moisture content inhaled into the cooking cavity, the second gas moisture content discharged from the cooking cavity, and the third gas moisture content generated by heating according to the state data and the operating parameters, and obtains the current humidity according to the original gas moisture content, the first gas moisture content, the second gas moisture content and the third gas moisture content.

[0021] In this way, the humidity in the cooking cavity can be indirectly measured.

[0022] Preferably, the time t0 corresponding to the last humidity and the time t1 corresponding to the current humidity satisfy:

[0023] 3s≤t1-t0≤5s.

[0024] The above calculation frequency is used to reduce the error introduced during the calculation and will not occupy too many computing resources.

[0025] An automatic cooking machine comprises a cooking cavity and a cooking machine pressure and humidity control device connected to the cooking cavity.

[0026] The positive and progressive effects of the present invention are:

[0027] The control component can realize linear adjustment of humidity by controlling the operating parameters of the heating device and the exhaust device, so that the pressure and / or humidity in the pot reaches the expected target pressure and humidity, thereby improving the cooking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional view of an automatic cooking machine;

[0029] Figure 2 for Figure 1 A partial enlarged view of part A;

[0030] Figure 3 is the electrical block diagram of the present invention;

[0031] Description of reference numerals:

[0032] Cooking cabinet 100

[0033] Heating device 200

[0034] Exhaust device 300

[0035] Intake passage 310

[0036] Cover assembly 320

[0037] Exhaust channel 330

[0038] Fan 331

[0039] Sensor Group 400

[0040] Humidity Sensor 410

[0041] First temperature sensor 420

[0042] First pressure sensor 430

[0043] Second temperature sensor 440

[0044] Second pressure sensor 450

[0045] Control Components 500 DETAILED DESCRIPTION

[0046] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0047] like Figure 1 , Figure 2 and Figure 3 As shown, a pressure and humidity control device for a cooking machine includes a heating device 200 for heating a cooking cavity 100 in the cooking machine, an exhaust device 300 for exhausting the cooking cavity 100, a sensor group 400 for measuring state data of the cooking cavity 100 and the exhaust device 300, and a control component 500 connected to the sensor group 400, the heating device 200 and the exhaust device 300. The control component 500 is used to adjust the operating parameters of the heating device 200 and the exhaust device 300 according to the state data measured by the sensor group 400 to control the cooking parameters in the cooking cavity 100, and the cooking parameters include pressure and / or humidity.

[0048] Specifically, the heating device 200 is a heating wire disposed at the bottom of the cooking cavity 100. The food in the cooking cavity 100 is heated by adjusting the power of the heating wire.

[0049] Combination Figure 1 and Figure 2The exhaust device 300 includes an air inlet passage 310 connecting the cooking cavity 100 with the outside, a cover assembly 320 connecting the air inlet passage 310, an exhaust passage 330 connecting the cooking cavity 100 with the outside, and a fan 331 disposed in the exhaust passage 330. The fan 331 is used to exhaust air outwards to take away the smoke in the cooking cavity 100. The cover assembly 320 can open the air inlet passage 310 when the fan 331 is working to replenish air in the cooking cavity 100 so that the exhaust can be carried out normally, and can also close the air inlet passage 310 when the exhaust device 300 stops working to close the cooking cavity 100, so that water vapor can accumulate in the cooking cavity 100 and thus increase the pressure and humidity in the cooking cavity 100.

[0050] The sensor group 400 includes a humidity sensor 410, a first temperature sensor 420 and a first pressure sensor 430 arranged at the air inlet channel 310; a second temperature sensor 440 and a second pressure sensor 450 arranged in the cooking cavity 100, and optionally, can also include a wind speed sensor arranged in the air inlet channel 310 and / or the exhaust channel 330.

[0051] The state data measured by the sensor group 400 include humidity data at the air inlet passage 310 measured by the humidity sensor 410, air inlet temperature data measured by the first temperature sensor 420, air inlet pressure data measured by the first pressure sensor 430, pressure data in the cooking cavity 100 measured by the second pressure sensor 450, and temperature data in the cooking cavity 100 measured by the second temperature sensor 440. In the solution with a wind speed sensor, the state data also includes wind speed data in the air inlet passage 310 and / or the exhaust passage 330. For the solution without a wind speed sensor, the wind speed can be obtained by combining the rotation speed of the fan 331 with the cross-sectional area of ​​the air inlet passage 310 or the exhaust passage 330.

[0052] The operating parameters of the heating device 200 include the heating power. The operating parameters of the exhaust device 300 include the rotation speed of the fan 331 and the opening and closing range of the cover assembly 320.

[0053] Combination Figure 3 The control component 500 controls the humidity and pressure in the cooking pot by adjusting the operating parameters of the exhaust device 300 and the heating device 200, and specifically includes the following operations:

[0054] The heating power of the heating device 200 is increased or the heating device 200 is maintained in a heating state, at which time the generated water vapor in the cooking cavity 100 increases, the humidity increases, and the pressure increases;

[0055] The heating power of the heating device 200 is reduced or the heating device 200 is turned off, at which time the water vapor generated is reduced, and the humidity and pressure in the cooking cavity 100 are reduced;

[0056] Turn on the fan 331 or increase the speed of the fan 331. At this time, more water vapor in the cooking cavity 100 is extracted to the outside of the cooking cavity 100, and the humidity and pressure in the cooking cavity 100 are reduced;

[0057] Turn off the fan 331 or reduce the speed of the fan 331. At this time, more water vapor is sealed in the cooking cavity 100, and the humidity and pressure in the cooking cavity 100 increase.

[0058] The opening range of the cover assembly 320 is increased, and more low-pressure and low-temperature gas from the outside enters the cooking cavity 100, and the humidity and pressure in the cooking cavity 100 are reduced;

[0059] The opening range of the cover assembly 320 is reduced, and the external low-pressure and low-temperature gas entering the cooking cavity 100 is reduced, and the humidity and pressure in the cooking cavity 100 are increased.

[0060] It can be seen that the control component 500 can achieve linear regulation of humidity and / or pressure by controlling the operating parameters of the heating device 200 and the exhaust device 300, so that the pressure and / or humidity in the pot reaches the expected target pressure and / or humidity, thereby improving the cooking effect.

[0061] In this embodiment, the control component 500 makes the real-time pressure in the pot reach the target pressure in the following manner:

[0062] The control component 500 calculates the expected pressure in the cooking cavity 100 after a preset time period based on the status data measured by the sensor group 400 and the operating parameters of the heating device 200 and the exhaust device 300, and adjusts the operating parameters to make the expected pressure consistent with the target pressure.

[0063] Specifically, the control component 500 includes a first calculation module, which is used to obtain the original gas mass in the cooking cavity 100 according to the measured state data and the operating parameters of the heating device 200 and the exhaust device 300; the first gas mass discharged outside the cooking cavity 100; the second gas mass sucked into the gas in the cooking cavity 100; the third gas mass generated by heating, and calculate the expected pressure based on the original gas mass, the first gas mass, the second gas mass, and the third gas mass.

[0064] Among them, the original gas mass n o Satisfies the following formula:

[0065]

[0066] Wherein, P0 is the pressure in the cooking cavity 100 , V is the volume of the cooking cavity 100 , R is a constant, and T0 is the temperature in the cooking cavity 100 .

[0067] The first gas substance mass n1 satisfies the following formula:

[0068]

[0069] Among them, P1 is the pressure of the air inlet channel 310, v0 is the wind speed in the exhaust channel 330, S0 is the cross-sectional area of ​​the exhaust channel 330, ξ is the area ratio between the air inlet channel 310 and the exhaust channel 330, and the ratio is determined by the opening range of the cover assembly 320, T1 is the gas temperature at the air inlet channel 310, and t is the operating time of the fan 331.

[0070] The second gas mass n2 satisfies the following formula:

[0071]

[0072] Wherein, P0 is the pressure in the cooking cavity 100 , v0 is the wind speed in the exhaust passage 330 , S0 is the cross-sectional area of ​​the exhaust passage 330 , T0 is the temperature in the cooking cavity 100 , and t is the operating time of the fan 331 .

[0073] The third gas substance amount n3 satisfies the following formula:

[0074] n3=mt

[0075] Here, m is the amount of water vapor generated per unit time by the heating device 200 , and t is the operating time of the heating device 200 .

[0076] The estimated pressure P satisfies the following formula:

[0077]

[0078] Wherein, T is the current temperature in the cooking cavity 100, V is the volume of the cooking cavity 100, and R is a constant.

[0079] Thus, the predicted pressure in the cooking cavity 100 after a preset time period can be obtained by calculating the change in the amount of gas in the cooking cavity 100. Thus, the pressure in the cooking cavity 100 can reach the target pressure by simply setting the corresponding operating parameters and operating time of the exhaust device 300 and the heating device 200, thereby making the pressure in the cooking cavity 100 better fit the target pressure curve and improving the control accuracy. In addition, this method does not require frequent parameter adjustments of the heating device 200 and the exhaust device 300, which is also conducive to improving the service life of the cooking pot.

[0080] In this embodiment, the control component 500 makes the real-time humidity in the pot reach the target humidity by the following method:

[0081] The control component 500 is used to calculate the humidity in the cooking cavity 100 multiple times, and each time the humidity in the cooking cavity is calculated, it is calculated based on the humidity in the cooking cavity 100 calculated last time and the real-time humidity measured by the humidity sensor.

[0082] Specifically, the humidity in the cooking cavity 100 calculated last time is combined with the currently measured humidity in the air inlet channel 310 to calculate the current humidity in the cooking cavity 100, and the humidity in the cooking cavity 100 is calculated each time in this way.

[0083] Since the air inlet passage 310 is outside the cooking cavity 100 and has a lower temperature, and is not exposed to the high temperature environment of the cooking cavity 100 for a long time, an ordinary humidity sensor 410 can be used to measure the humidity. There is no need to use a special humidity sensor 410 with a higher cost to withstand high temperatures, thereby effectively reducing costs.

[0084] In this embodiment, the initial humidity in the cooking cavity 100 is the humidity in the air intake channel 310. The control component 500 uses the initial humidity as the initial value to perform iterative calculations to obtain the real-time humidity in the cooking cavity 100. When the cooking machine just starts working, the humidity in the cavity is basically consistent with the external ambient humidity, and will not introduce too many errors, so that the accuracy of subsequent calculations can be guaranteed.

[0085] In this embodiment, the current humidity in the 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 310 measured currently in the following manner:

[0086] The control component 500 includes a second calculation module, which calculates the water content of the original gas in the cooking cavity 100, the water content of the first gas sucked into the cooking cavity 100, the water content of the second gas discharged from the cooking cavity 100, and the water content of the third gas generated by heating according to the state data and the operation parameters, and obtains the current humidity according to the water content of the original gas, the water content of the first gas, the water content of the second gas, and the water content of the third gas. In this way, the indirect measurement of the humidity in the cooking cavity 100 is achieved.

[0087] The water content of the original gas is m o Satisfies the following formula:

[0088]

[0089] in: is the last humidity in the cooking cavity 100, ρ wmax0 is the maximum absolute humidity at the last temperature T0 in the cooking cavity 100 , where T0 is measured by the second temperature sensor 440 disposed in the cooking cavity 100 , and V is the volume of the cooking cavity 100 .

[0090] The water content m1 of the first gas sucked into the cooking cavity 100 satisfies the following formula:

[0091]

[0092] Wherein, t is the operation time of the exhaust device 300, ν is the air flow rate when the exhaust device 300 is working, and the air flow rate is obtained by multiplying the flow velocity in the air inlet passage 310 by the cross-sectional area of ​​the air inlet passage 310, is the humidity in the air intake passage 310, ρ wmax is the maximum absolute humidity at an outside temperature T, where the outside temperature T is measured by a first temperature sensor 420 disposed in the air intake passage 310;

[0093] The water content m2 of the second gas discharged from the cooking cavity 100 satisfies the following formula:

[0094]

[0095] Where: t is the operation time of the exhaust device 300, 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 440 disposed in the cooking cavity 100, and ν is the air flow rate when the exhaust device 300 is working, where the air flow rate is obtained by multiplying the flow velocity in the exhaust passage 330 by the cross-sectional area of ​​the exhaust passage 330;

[0096] The water content m3 of the third gas generated by heating satisfies the following formula:

[0097]

[0098] 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.

[0099] The humidity calculated this time satisfies the following formula:

[0100]

[0101] Among them, m o is the water content of the original gas, 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, 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 440 disposed in the cooking cavity 100, and δ is the air mixing coefficient in the cooking machine.

[0102] In this embodiment, the time t0 corresponding to the last humidity and the time t1 corresponding to the current humidity satisfy:

[0103] 3s≤t1-t0≤5s.

[0104] 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 500, which is conducive to cost control.

[0105] In this embodiment, the operation time t of the heating device 200 and the exhaust device 300 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 300 always operate in a constant state, which can be a working state or a static state. The adjustment of the operating parameters of the heating device 200 and the exhaust device 300 is performed when the previous calculation ends and the current calculation begins. This can simplify the calculation steps and save computing resources.

[0106] Example 2

[0107] The cooking machine pressure and humidity control device provided in this embodiment has a different pressure control logic from the cooking machine pressure and humidity control device of Example 1. In this embodiment, the status data measured by the sensor group 400 includes the real-time pressure in the cooking chamber 100. The control component 500 is used to compare the real-time pressure and the target pressure. When the real-time pressure is lower than the target pressure, the heating power of the heating device 200 is increased and / or the exhaust volume of the exhaust device 300 is reduced; when the real-time pressure is higher than the target pressure, the heating power of the heating device 200 is reduced and / or the exhaust volume of the exhaust device 300 is increased.

[0108] Thus, the control component 500 can adjust the pressure in the cooking cavity 100 in real time so that the real-time pressure approaches the target pressure, so that the cooking cavity 100 can maintain a stable and accurate pressure and / or humidity.

[0109] Example 3

[0110] This embodiment provides an automatic cooking machine, including a housing, a cooking cavity 100 and a cooking machine pressure and humidity control device as described in Embodiment 1 or Embodiment 2.

[0111] 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 and the protection scope of the present invention is defined by the appended claims. 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 protection scope of the present invention.

Claims

1. A cooking machine pressure and humidity control device, Features: The cooking machine comprises a heating device for heating a cooking cavity in the cooking machine, an exhaust device for exhausting the cooking cavity, and a sensor group for measuring status data of the cooking cavity and the exhaust device, wherein the sensor group, the heating device and the exhaust device are connected to a control component, and the control component is used to adjust the operating parameters of the heating device and the exhaust device according to the status data to control the cooking parameters in the cooking cavity, wherein the cooking parameters include pressure and / or humidity; The control component is used to calculate the expected pressure in the cooking cavity after a preset time period according to the state data and the operating parameters of the heating device and the exhaust device, and adjust the operating parameters to make the expected pressure consistent with the target pressure; The control component includes a first calculation module, the first calculation module is used to obtain the original gas substance mass in the cooking cavity, the first gas substance mass discharged outside the cooking cavity, the second gas substance mass inhaled into the cooking cavity, and the third gas substance mass generated by heating according to the state data and the operation parameters, and calculate the expected pressure according to the original gas substance mass, the first gas substance mass, the second gas substance mass, and the third gas substance mass; The state data includes humidity in an air inlet passage connected to the cooking cavity, and 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, it is calculated based on the humidity in the cooking cavity calculated last time combined with the humidity in the air inlet passage; The initial humidity in the cooking cavity is the humidity in the air inlet passage; The control component includes a second calculation module, which calculates the original gas moisture content in the cooking cavity, the first gas moisture content sucked into the cooking cavity, the second gas moisture content discharged from the cooking cavity, and the third gas moisture content generated by heating according to the state data and the operating parameters, and obtains the current humidity according to the original gas moisture content, the first gas moisture content, the second gas moisture content and the third gas moisture content.

2. The cooking machine pressure and humidity control device according to claim 1, Features: The status data includes the real-time pressure in the cooking cavity. The control component is used to compare the real-time pressure with the target pressure. When the real-time pressure is lower than the target pressure, the heating power of the heating device is increased and / or the exhaust volume of the exhaust device is reduced; when the real-time pressure is higher than the target pressure, the heating power of the heating device is reduced and / or the exhaust volume of the exhaust device is increased.

3. The cooking machine pressure and humidity control device according to claim 1, Features: The exhaust device includes an air intake channel and an exhaust channel connected to the cooking cavity, and also includes a cover assembly for controlling the opening and closing of the air intake channel and a fan arranged in the exhaust channel. The operating parameters of the exhaust device include the opening width of the cover assembly relative to the air intake channel and the rotation speed of the fan. The operating parameters of the heating device include the heating power. The status data include the temperature, pressure and air flow rate in the air intake channel, the air flow rate in the exhaust channel, and the temperature and pressure in the cooking cavity.

4. The cooking machine pressure and humidity control device according to claim 1, Features: Corresponding to the time t of the last humidity 0 and the time t corresponding to this humidity 1 Satisfaction: 3s≤t 1 -t 0 ≤5s。 5. An automatic cooking machine, Features: The cooking machine comprises a cooking cavity and a cooking machine pressure and humidity control device as claimed in any one of claims 1 to 4 connected to the cooking cavity.

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