Evaporator, control method and steam oven

Abstract

The present invention provides an evaporator, a control method, and a steam oven, belonging to the technical field of kitchen appliances. The evaporator of the present invention includes an evaporator base, a first heating element, a second heating element, and a water level probe. The evaporator base divides the internal cavity into a first heating zone and a second heating zone by a partition. Steam is generated by a first heating element installed in the first heating zone, and the steam is heated by a second heating element installed in the second heating zone, thereby improving the quality of the steam. The water level in the first heating zone is detected by a water level probe. The performance of the evaporator is improved to an efficiency of >96%, a steam temperature of >150°C, and a steam dryness of >96%, thereby shortening the cooking time, increasing the moisture content, reducing the hardness of the food, improving the chewiness, and retaining more nutrients.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to an evaporator, a control method and a steam oven. Background Art

[0002] A steam oven is a kitchen appliance that combines a steamer and an oven. Commercially available steam ovens typically include a chamber, evaporator, water pump, and water tank. The following uses a direct-injection steam oven as an example:

[0003] The steam oven uses a water pump to drain the water from the water tank to the evaporator. The heating element in the evaporator boils the water in the evaporator into steam, and the steam is sprayed into the cavity of the steam oven through a water pipe, instantly generating a large amount of high-temperature steam in the cavity to cook food.

[0004] Since the efficiency of the steam oven is generally less than 90%, the steam temperature is 97-98℃, and the steam dryness is less than 90%, there are problems such as long cooking time, low moisture content of ingredients, high hardness, poor chewiness, and high loss of nutrients. Summary of the Invention

[0005] The purpose of the present invention is to provide an evaporator with improved performance to an efficiency of >96%, a steam temperature of >150°C, and a steam dryness of >96%, thereby shortening cooking time, increasing moisture content, reducing food hardness, improving chewiness, and retaining more nutrients.

[0006] Another object of the present invention is to provide a method for controlling an evaporator.

[0007] Another object of the present invention is to provide a steam oven.

[0008] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0009] According to one aspect of the present invention, there is provided an evaporator comprising:

[0010] The evaporator base is a shell having a cavity therein. A partition is provided in the cavity to separate the cavity into a first heating zone and a second heating zone. The partition is provided with an air vent to connect the two heating zones. A water inlet is provided in the first heating zone for water inlet. An evaporator temperature sensor is provided in the second heating zone for detecting an actual temperature value T1 of the second heating zone. A steam outlet is provided in the evaporator base for discharging heated steam.

[0011] a first heating element installed in the first heating zone, for heating water in the first heating zone to generate steam;

[0012] a second heating element, installed in the second heating zone, for heating the steam to improve the steam quality; and

[0013] A water level probe penetrates through the evaporator base and extends into the first heating zone to detect the water level in the first heating zone.

[0014] According to an embodiment of the present invention, the evaporator further includes a controller, which is connected to the water level probe, the evaporator temperature sensor and the second heating element, and is configured to automatically control the water inlet of the evaporator according to the detection situation of the water level probe received, and is also configured to receive the actual temperature value T1 of the second heating zone, compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator, and control the heating temperature of the second heating zone according to the comparison result.

[0015] According to an embodiment of the present invention, the controller controls the heating temperature of the second heating zone by controlling the heating duty cycle of the second heating element.

[0016] According to an embodiment of the present invention, when T1 < T - M, the controller controls the heating duty cycle of the second heating element to be A / Y, where M is a control parameter, A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; or

[0017] When T - M ≤ T1 < T, the controller controls the heating duty cycle of the second heating element to be B / Y, where M is a control parameter, B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; or

[0018] When T ≤ T1 < T + N, the controller controls the heating duty cycle of the second heating element to be C / Y, where N is a control parameter, C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle;

[0019] Where 0 < C < B < A ≤ Y.

[0020] According to an embodiment of the present invention, M ranges from 15 to 25 degrees Celsius, and N ranges from 15 to 25 degrees Celsius.

[0021] According to an embodiment of the present invention, the evaporator is applied to a steam oven, and a steam oven temperature sensor is provided in the steam oven to detect the actual temperature value T4 of the steam oven. The controller is configured to compare the actual temperature value T4 of the steam oven received with the set temperature value T3 of the steam oven, and control the heating duty cycle of the first heating element according to the comparison result.

[0022] According to an embodiment of the present invention, when T4 < T3, the controller controls the heating duty ratio of the first heating element to be X / Z, where X = Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; or

[0023] when T4 = T3, the controller controls the heating duty ratio of the first heating element to be X / Z, where 0 < X < Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; or

[0024] when T3 < T4 < T3 + P, the controller controls the first heating element to stop working, where P is a control parameter, and the controller controls the second heating element to switch to the stage of T ≤ T1 < T + N, and controls the heating duty ratio of the second heating element to be C / Y.

[0025] According to an embodiment of the present invention, P is 5 - 15 degrees Celsius.

[0026] According to an embodiment of the present invention, the evaporator further includes a water pump and a water tank. The water pump is connected to the water tank and the water inlet through a pipeline. The water level probe includes a long water level probe and a short water level probe. The controller is configured to control the duty ratio of the water pump for pumping water, where

[0027] when the long water level probe does not detect water, the controller controls the duty ratio of the water pump for pumping water to be D / W, and the water pump continuously pumps water, where D = W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time; or

[0028] when the short water level probe detects water, the controller controls the water pump not to work; or

[0029] when the short water level probe does not detect water and the long water level probe detects water, the duty ratio of the water pump for pumping water is controlled to be D / W, where 0 < D < W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time.

[0030] According to an embodiment of the present invention, both the first heating element and the second heating element are buried in the evaporator base.

[0031] According to an embodiment of the present invention, the evaporator further includes a first fin and a second fin, which are provided corresponding to the first heating element and the second heating element.

[0032] According to another aspect of the present invention, there is also provided a steam oven, the above-mentioned evaporator.

[0033] According to another aspect of the present invention, a control method applied to an evaporator is further provided. The evaporator includes: a first heating zone and a second heating zone, a first heating element and a second heating element corresponding to the first heating zone and the second heating zone, and a water level probe for detecting the water level in the first heating zone. The control method includes the following steps:

[0034] Obtain the actual temperature value T1 of the second heating zone;

[0035] Compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator. According to the comparison result, control the heating duty cycle of the second heating element, and further control the heating temperature of the second heating zone.

[0036] According to an embodiment of the present invention, when comparing the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator and controlling the heating duty cycle of the second heating element according to the comparison result to further control the heating temperature of the second heating zone, it specifically includes:

[0037] When T1 < T - M, control the heating duty cycle of the second heating element to be A / Y, where M is a control parameter, A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; or

[0038] When T - M ≤ T1 < T, control the heating duty cycle of the second heating element to be B / Y, where M is a control parameter, B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; or <着

[0039] When T ≤ T1 < T + N, control the heating duty cycle of the second heating element to be C / Y, where N is a control parameter, C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle;

[0040] Among them, A, B, and C are constants satisfying 0 < C < B < A ≤ Y.

[0041] According to an embodiment of the present invention, M is取值 between 15 - 25 degrees Celsius, and N is取值 between 15 - 25 degrees Celsius.

[0042] According to an embodiment of the present invention, when the evaporator is applied to a steam oven, it further includes:

[0043] Obtain the actual temperature value T4 of the steam oven;

[0044] Compare the actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven. According to the comparison result, control the heating duty cycle of the first heating element.

[0045] According to an embodiment of the present invention, the actual temperature value T4 of the steam oven is compared with the set temperature value T3 of the steam oven, and according to the comparison result, the heating duty ratio of the first heating element is controlled, which specifically includes:

[0046] When T4 < T3, control the heating duty ratio of the first heating element to be X / Z, where X = Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; or

[0047] When T4 = T3, control the heating duty ratio of the first heating element to be X / Z, where 0 < X < Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; or

[0048] When T3 < T4 < T3 + P, control the first heating element to stop working, where P is a control parameter, and the second heating element is converted to the stage of T ≤ T1 < T + N, and control the heating duty ratio of the second heating element to be C / Y.

[0049] According to an embodiment of the present invention, P is 5 - 15 degrees Celsius.

[0050] According to an embodiment of the present invention, the water level probe includes a long water level probe and a short water level probe, and the control method further includes:

[0051] When the long water level probe does not detect water, control the heating duty ratio of the water pump to be D / W, and the water pump continuously pumps water, where D = W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time, and when the long water level probe does not detect water for a preset time, send a water shortage alarm, stop the evaporator (100) from working, and refill the water tank; or

[0052] When the short water level probe detects water, the water pump does not work; or

[0053] When the short water level probe does not detect water and the long water level probe detects water, control the heating duty ratio of the water pump to pump water to be D / W, where 0 < D < W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time.

[0054] According to another aspect of the present invention, a steam oven is further provided, which adopts the above control method.

[0055] One embodiment of the present invention has the following advantages or beneficial effects:

[0056] The evaporator of the present invention includes an evaporator base, a first heating element, a second heating element, and a water level probe. The evaporator base has an internal cavity divided into a first heating zone and a second heating zone by a partition. Steam is generated by the first heating element installed in the first heating zone, and heated by the second heating element installed in the second heating zone, thereby improving steam quality. This improves evaporator performance to efficiency >96%, steam temperature >150°C, and steam dryness >96%, thereby shortening cooking time, increasing moisture content, reducing food hardness, improving chewiness, and retaining more nutrients. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings.

[0058] Figure 1 is a schematic front view of an evaporator with a cover removed according to an exemplary embodiment;

[0059] Figure 2 yes Figure 1 A schematic exploded view of an evaporator is shown;

[0060] Figure 3 yes Figure 1 A schematic logic control diagram of the evaporator is shown;

[0061] Figure 4 yes Figure 1 A schematic structural diagram of the evaporator control system is shown.

[0062] The description of the accompanying drawings is as follows:

[0063] 1 steam oven temperature sensor,

[0064] 100 evaporators,

[0065] 10 evaporator seat, 11 partition, 12 air vent, 13 first heating zone, 14 second heating zone, 15 water inlet, 16 evaporator temperature sensor, 17 steam outlet, 18 first fin, 19 second fin,

[0066] 20 first heating element,

[0067] 30 second heating element,

[0068] 40 water level probe, 41 long water level probe, 42 short water level probe,

[0069] 50 controllers,

[0070] 60 water pumps,

[0071] 70 convex jump thermostat. DETAILED DESCRIPTION

[0072] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0073] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0074] like Figures 1-4 As shown, Figure 1 FIG. 1 is a schematic front view of an evaporator with a cover removed according to an exemplary embodiment. Figure 2 yes Figure 1 A schematic exploded view of an evaporator is shown. Figure 3 yes Figure 1 A schematic logic control diagram of the evaporator is shown. Figure 4 yes Figure 1 A schematic structural diagram of the evaporator control system is shown.

[0075] like Figure 1 See also Figure 2This embodiment provides an evaporator 100, which generally includes: an evaporator base 10, a first heating element 20, a second heating element 30, and a water level probe 40. The evaporator base 10 is a shell with a cavity inside. A partition 11 is provided in the cavity to divide the cavity into a first heating zone 13 and a second heating zone 14. More specifically, the partition 11 is a transverse partition that divides the cavity into the second heating zone 14 and the first heating zone 13, which are arranged above and below. Preferably, the first heating zone 13 is arranged along the entire length of the evaporator base 10. The second heating zone 14 is arranged partially along the length of the evaporator base 10. A vent hole 12 is provided in the partition 11 to connect the first heating zone 13 and the second heating zone 14. A water inlet 15 is provided in the first heating zone 13 for water intake. The second heating zone 14 is provided with an evaporator temperature sensor 16, which is used to detect the actual temperature value T1 of the second heating zone. A steam outlet 17 is provided in the evaporator base 10 for discharging heated steam. The first heating element 20 is installed in the first heating zone 13 and is used to heat the water in the first heating zone 13 to generate steam. The steam enters the second heating zone 14 through the air vents 12 in the partition 11. The second heating element 30 is installed in the second heating zone 14 and is used to heat the steam. This secondary heating of the steam breaks up steam bubbles and increases the steam dryness. This secondary heating raises the steam temperature from 97-98°C to 150°C, resulting in high-temperature dry steam and improving steam quality. A water level probe 40 extends through the evaporator base 10 and into the first heating zone 13 to monitor the water level within the first heating zone 13.

[0076] The evaporator base 10 of the present invention has its internal cavity divided into a first heating zone 13 and a second heating zone 14 by a partition 11. A first heating element 20 installed in the first heating zone 13 generates steam, while a second heating element 30 installed in the second heating zone 14 heats the steam, thereby improving steam quality. This boosts the performance of the evaporator 100 to efficiency >96%, steam temperature >150°C, and steam dryness >96%, thereby shortening cooking time, increasing moisture content, reducing food hardness, improving chewiness, and retaining more nutrients.

[0077] In a preferred embodiment of the present invention, Figure 4 As shown, the evaporator 100 further includes a controller 50. The controller 50 is connected to the water level probe 40, the evaporator temperature sensor 16, and the second heating element 30. The controller 50 is configured to automatically control the water supply to the evaporator 100 based on the detection status received from the water level probe 40. The controller 50 is also configured to receive the actual temperature value T1 of the second heating zone, compare the actual temperature value T1 of the second heating zone with the preset evaporator temperature value T, and control the heating temperature of the second heating zone 14 based on the comparison result.

[0078] In specific implementation, the controller 50 can be implemented through a chip and a signal circuit, or can also be implemented through the signal circuit.

[0079] In a preferred embodiment of the present invention, as Figure 3 shown, the controller 50 controls the heating duty cycle of the second heating element 30, and further controls the heating temperature of the second heating zone 14, to protect the evaporator 100 from melting due to excessive temperature.

[0080] Preferably, the first heating element 20 is a heating tube, and the second heating element 30 is a heating tube. The evaporator temperature sensor 16 is an NTC sensor.

[0081] More specifically, as Figure 3 shown, when T1 < T - M, it is the temperature rising stage. The controller 50 controls the heating duty cycle of the second heating element 30 to be A / Y. Wherein, T1 is the actual temperature value of the second heating zone. T is the preset temperature value of the evaporator, and it can be T > 100 °C, for example, T is taken as 150 °C - 170 °C. M is a control parameter, which is related to the power density of the heating element. The greater the power, the higher the value of M. According to actual situation tests, M is taken as 15 °C - 25 °C, and usually M is taken as about 20 °C. A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. In this stage, A = Y. For example, T1 is 100 °C, T is 150 °C, M is 20 °C, and T - M is 130 °C. If Y is taken as 30 seconds, then A is taken as 30 seconds. The heating duty cycle of the second heating element 30 is 30 / 30. The second heating element 30 is fully open to achieve rapid temperature rise.

[0082] Or, when T - M ≤ T1 < T, it is the stable stage of temperature rising without overheating. The controller 50 controls the heating duty cycle of the second heating element 30 to be B / Y. Wherein, M is a control parameter, which is related to the power density of the heating element. The greater the power, the higher the value of M. According to actual situation tests, M is taken as 15 °C - 25 °C, and usually M is taken as about 20 °C. B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. In this stage, B = 0.66Y - 0.83Y. For example, T1 is 140 °C, T is 150 °C, M is 20 °C, and T - M is 130 °C. If Y is taken as 30 seconds, then B is taken as 20 seconds - 25 seconds, and the heating duty cycle of the second heating element 30 is 20 / 30 - 25 / 30, to achieve stable temperature rise.

[0083] Alternatively, when T ≤ T1 < T + N, during the over-temperature stage, the second heating element 30 cools down slowly. The controller 50 controls the heating duty cycle of the second heating element 30 to be C / Y, where N is a control parameter with a value ranging from 15°C to 25°C, and typically N is about 20°C. C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. In this stage, C = 0.20Y - 0.33Y. For example, if T1 is 160°C, T is 150°C, N is 20°C, and T + N is 170°C. When Y is 30 seconds, C ranges from 6 seconds to 10 seconds. The heating duty cycle of the second heating element 30 is 6 / 30 - 10 / 30, achieving slow cooling.

[0084] Where 0 < C < B < A ≤ Y.

[0085] In a preferred embodiment of the present invention, as shown in Figure 4 The evaporator 100 is applied to a steam oven. A steam oven temperature sensor 1 is provided in the steam oven to detect the actual temperature value T4 of the steam oven. The controller 50 is configured to compare the received actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven, and control the heating temperature of the first heating element 20 according to the comparison result. In this embodiment, the heating temperature of the first heating element 20 is controlled by controlling the heating duty cycle of the first heating element 20.

[0086] In a preferred embodiment of the present invention, as shown in Figure 3 During the rapid heating stage when T4 < T3. The controller 50 controls the heating duty cycle of the first heating element 20 to be X / Z. Where T4 is the actual temperature value of the steam oven, T3 is the set temperature value of the steam oven, X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle. In this stage, X = Z. For example, if T3 is 100°C and T4 is 80°C. When Z is 30 seconds, X is 30 seconds. The heating duty cycle of the first heating element 20 is 30 / 30, achieving rapid heating.

[0087] Alternatively, when T4 = T3, during the stable heating stage, the working state is maintained. The controller 50 controls the heating duty cycle of the first heating element 20 to be X / Z. Where 0 < X < Z, X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle. In this stage, X = 0.20Z - 0.33Z. For example, if T3 is 100°C and T4 is 100°C. When Z is 30 seconds, X ranges from 6 seconds to 10 seconds, and the heating duty cycle of the first heating element 20 is 6 / 30 - 10 / 30, maintaining the working state.

[0088] Alternatively, when T3 < T4 < T3 + P, i.e., the over-temperature stage. The controller 50 controls the heating duty cycle of the first heating element 20 to be X / Z. Here, P is a control parameter, P ranges from 5°C to 15°C, and usually P is about 10°C. X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle. In this stage, X = 0, and the controller 50 controls the first heating element 20 not to work, that is, the first heating element 20 is turned off. For example, T3 is 100°C, T4 is 105°C, P is 10°C, and T3 + P is 110°C. At the same time, the controller 50 controls the second heating element 30 to switch to the stage where T ≤ T1 < T + N, and controls the heating duty cycle of the second heating element 30 to be C / Y, where C = 0.20Y - 0.33Y, and the second heating element 30 cools down slowly.

[0089] From the above control, it can be seen that in this embodiment, the first heating element 20 is always on during heating and off during over-temperature. The second heating element 30 is always on and maintained at a certain temperature so that it can be heated to a preset temperature at any time.

[0090] In a preferred embodiment of the present invention, as shown in Figure 4 Figure [not provided], the evaporator 100 further includes a water pump 60 and a water tank. The water pump 60 is connected to the water tank and the water inlet 15 through a pipeline. As Figure 1 Figure [not provided] shows, the water level probe 40 includes a long water level probe 41 and a short water level probe 42 to detect the high and low water levels. The working principle of the water level probe 40: Since water contains Ca 2+ , Mg 2+ , Na + , HCO3 - , SO4 2+ and other ions, the water has a certain conductivity. By detecting the conductivity, it is detected whether there is water in the evaporator 100. As Figure 3As shown, the controller 50 controls the duty cycle of the water pump 60 for pumping water as D / W, where D is the continuous working time within a single heating cycle, W is the time of a single heating cycle, and 0 < D ≤ W. For example, if W is 30 seconds, then D ranges from greater than 0 seconds to 30 seconds. The value of D is determined according to the cross-sectional area of the evaporator 100, and there is a linear relationship between the two. The larger the cross-sectional area of the evaporator 100, the larger the value of D. More specifically, when the long water level probe 41 does not detect water, the controller 50 controls the duty cycle of the water pump 60 for pumping water as D / W, and the water pump 60 continuously pumps water, where D = W, D is the continuous working time within a single pumping cycle, and W is the time of a single pumping cycle. Or when the short water level probe 42 detects water, the controller 50 controls the water pump 60 not to work. Or when the short water level probe 42 does not detect water and the long water level probe 41 detects water, the duty cycle of the water pump 60 for pumping water is controlled as D / W, where 0 < D < W, D is the continuous working time within a single pumping cycle, and W is the time of a single pumping cycle. Through the above control, the liquid level in the evaporator 100 is always maintained at a certain height, and the evaporator 100 is filled with water but not too much, the temperature fluctuation is small, and steam can be continuously generated. Further, when the low water level probe does not detect water, a water shortage alarm is issued.

[0091] In a preferred embodiment of the present invention, as Figure 1 shown, reference may also be made to Figure 2 , both the first heating element 20 and the second heating element 30 are buried in the evaporator base 10. In this example, the heating elements are buried inside the evaporation base to reduce energy loss. Specifically, the heating elements can be cast together with the evaporator base 10.

[0092] In a preferred embodiment of the present invention, as Figure 1 shown, the evaporator 100 further includes a first fin 18 and a second fin 19, which are arranged corresponding to the positions of the first heating element 20 and the second heating element 30. More specifically, in this example, the first heating element 20 is arranged at a position near the bottom in the first heating zone 13. The first fin 18 is arranged at a position near the bottom in the first heating zone 13 and is located at the front end of the first heating element 20. The first fin 18 is used to increase the heat exchange area between water and steam, and enable water to boil at a position close to the first fin 18. The second heating element 30 is arranged at a position near the bottom in the second heating zone 14. The second fin 19 is arranged at a position near the bottom in the second heating zone 14 and is located at the front end of the second heating element 30. The second fin 19 is used to increase the heat exchange area between steam and the evaporator 100, make the steam evenly heated, and increase the resistance to make the steam fully heated, so as to make the steam quality continuously stable.

[0093] In a preferred embodiment of the present invention, as Figure 2As shown, the evaporator 100 further includes a convex-jump thermostat 70 for cutting off the power supply when the evaporator 100 is in an abnormal stage.

[0094] This embodiment also provides a steam oven including the above-mentioned evaporator 100. In this embodiment, the structure of the evaporator 100 is the same as that of the evaporator 100 in the above embodiment, and the structural part of the evaporator 100 will not be described in detail in this embodiment.

[0095] See Figure 3 , this embodiment also provides a control method applied to the above-mentioned evaporator. The evaporator can have the same structure as the evaporator 100 described in the above embodiment. It should be noted that: the control method in this embodiment can also be applied to evaporator structures similar to those in the above embodiment. See Figure 1 , as long as the evaporator includes: a first heating zone 13 and a second heating zone 14, a first heating element 20 corresponding to the first heating zone 13, a second heating element 30 corresponding to the second heating zone 14, and a water level probe 40 for detecting the water level in the first heating zone 13. The control method of this embodiment can be adopted. The control method includes the following steps:

[0096] Step 100, obtain the actual temperature value T1 of the second heating zone;

[0097] Step 200, compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator, and according to the comparison result, control the heating duty cycle of the second heating element 30, and then control the heating temperature of the second heating zone 14.

[0098] Step 200 specifically includes:

[0099] Step 201, when T1 < T - M, in the heating-up stage, control the heating duty cycle of the second heating element 30 to be A / Y. Where, T1 is the actual temperature value of the second heating zone. T is the preset temperature value of the evaporator, and it can be T > 100°C. For example, T takes a value of 150°C - 170°C. M is a control parameter related to the power density of the heating element. The greater the power, the higher the value of M. According to actual tests, M takes a value in the range of 15°C - 25°C, and usually M takes a value of about 20°C. A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. In this stage, A = Y. For example, T1 is 100°C, T is 150°C. M is 20°C, and T - M is 130°C. Y takes a value of 30 seconds, then A takes a value of 30 seconds. The heating duty cycle of the second heating element 30 is 30 / 30. The second heating element 30 is fully open to achieve rapid heating. Or

[0100] Step 202, when T - M ≤ T1 < T, in the stable stage of non-overtemperature heating-up, control the heating duty cycle of the second heating element 30 to be B / Y. Here, M is a control parameter related to the power density of the heating element. The greater the power, the higher the value of M. According to actual tests, M ranges from 15°C to 25°C, and usually M is about 20°C. B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. For example, if T1 is 140°C, T is 150°C, X is 20°C, and T - M is 130°C, in this stage, B = 0.66Y - 0.83Y. For example, if Y is 30 seconds, then B ranges from 20 seconds to 25 seconds, and the heating duty cycle of the second heating element 30 is 20 / 30 - 25 / 30, achieving stable heating-up. Or

[0101] Step 203, when T ≤ T1 < T + N, in the over-temperature stage, the second heating element 30 cools down slowly. The controller 50 controls the heating duty cycle of the second heating element 30 to be C / Y. Here, N is a control parameter, ranging from 15°C to 25°C, and usually N is about 20°C. C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle. In this stage, C = 0.20Y - 0.33Y. For example, if T1 is 160°C, T is 150°C, N is 20°C, and T + N is 170°C. When Y is 30 seconds, then C ranges from 6 seconds to 10 seconds. The heating duty cycle of the second heating element 30 is 6 / 30 - 10 / 30, achieving slow cooling-down.

[0102] Among them, 0 < C < B < A ≤ Y. In a preferred embodiment of the present invention, as Figure 1 shown, the water level probe 40 includes a long water level probe 41 and a short water level probe 42. The control method further includes a method for controlling the automatic water intake of the evaporator 100 through the water level probe 40, and the specific steps are as follows:

[0103] Step 10, when the long water level probe 41 does not detect water, control the heating duty cycle of the water pump to be D / W, and the water pump continuously pumps water. Here, D = W, D is the continuous working time within a single pumping cycle, and W is the time of a single pumping cycle. For example, control the pumping duty cycle of the water pump to be 30 / 30. When the long water level probe 41 does not detect water for a continuous preset time, for example, it does not detect water 10 times in 10 seconds, send a water shortage alarm, stop the operation of the evaporator 100, and refill the water tank. Or

[0104] Step 20, when the short water level probe 42 detects water, the water pump 60 does not work. Or

[0105] Step 30, when the short water level probe 42 does not detect water and the long water level probe 41 detects water, control the duty ratio of the water pump 60 to pump water as D / W, where D is the continuous working time within a single heating cycle, Y is the time of a single heating cycle, and 0 < D ≤ W. For example: if W is 30 seconds, then D is greater than 0 seconds and less than or equal to 30 seconds. The value of D is determined according to the cross-sectional area of the evaporator 100, and there is a linear relationship between the two. The larger the cross-sectional area of the evaporator 100, the larger the value of D.

[0106] Through the above control, the liquid level in the evaporator 100 is always maintained at a certain height, and the evaporator 100 is supplied with water but not much water, with little temperature fluctuation, and can continuously produce steam.

[0107] In a preferred embodiment of the present invention, as Figure 1 shown, the above evaporator is applied to a steam oven. The control method further includes a method for controlling the heating temperature of the first heating element 20, which is carried out according to the following steps:

[0108] Step 40, obtain the actual temperature value T4 of the steam oven;

[0109] Step 50, compare the actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven, and control the heating temperature of the first heating element 20 according to the comparison result. More specifically, in this embodiment, the heating temperature of the first heating element 20 is controlled by controlling the heating duty ratio of the first heating element 20.

[0110] In a preferred embodiment of the present invention, refer to Figure 4 , step 50 specifically includes:

[0111] Step 51, when T4 < T3, control the heating duty ratio of the first heating element 20 as X / Z, where X is the continuous working time within a single heating cycle, Z is the time of a single heating cycle, and X = Z. For example, T3 is 100 °C and T4 is 80 °C. If Z is 30 seconds, then X is 30 seconds. The heating duty ratio of the first heating element 20 is 30 / 30, for rapid heating. Or

[0112] Step 52, when T4 = T3, control the heating duty ratio of the first heating element 20 as X / Z, where 0 < X < Z, X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle. X = 0.20Z - 0.33Z. For example, T3 is 100 °C and T4 is 100 °C. If Z is 30 seconds, then X is 6 seconds - 10 seconds, and the heating duty ratio of the first heating element 20 is 6 / 30 - 10 / 30, for maintaining operation. Or

[0113] Step 53, when T3 < T4 < T3 + P, it is the over-temperature stage. Control the heating duty cycle of the first heating element 20 to be X / Z. Here, P is a control parameter, P is 5°C - 15°C, and usually P is about 10°C. X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle. In this stage, X = 0, control the first heating element 20 not to work, that is, turn off the first heating element 20. For example, T3 is 100°C, T4 is 105°C, P is 10°C, and T3 + P is 110°C. At the same time, control the second heating element 30 to switch to the stage where T ≤ T1 < T + N, control the heating duty cycle of the second heating element 30 to be C / Y, C = 0.20Y - 0.33Y, and the second heating element 30 cools down slowly.

[0114] It can be seen from the above control that in this embodiment, the first heating element 20 is always on when heating up and off when over-temperature. The second heating element 30 is always on and maintained at a certain temperature, and can be heated to a preset temperature at any time.

[0115] This embodiment also provides a steam oven that adopts the above control method.

[0116] In the embodiments of the present invention, the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0117] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the embodiments of the present invention.

[0118] In the description of this specification, the description of terms such as "one embodiment", "one preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0119] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations are possible in the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An evaporator, characterized in that: Comprising: An evaporator base (10), which is a housing with a cavity inside. A partition (11) is provided in the cavity to divide the cavity into a first heating zone (13) and a second heating zone (14). A ventilation hole (12) is provided in the partition (11) to connect the two heating zones. A water inlet (15) is provided in the first heating zone (13) for water inlet. An evaporator temperature sensor (16) is provided in the second heating zone (14) for detecting the actual temperature value T1 of the second heating zone. A steam outlet (17) is provided in the evaporator base (10) for the heated steam to flow out; A first heating element (20), installed in the first heating zone (13), for heating the water in the first heating zone (13) to generate steam; A second heating element (30), installed in the second heating zone (14), for heating the steam to improve the steam quality; And A water level probe (40), passing through the evaporator base (10) and extending into the first heating zone (13) to detect the water level condition in the first heating zone (13); It further includes a controller (50), connected to the water level probe (40), the evaporator temperature sensor (16) and the second heating element (30), configured to automatically control the water inlet of the evaporator (100) according to the detection situation of the received water level probe (40), and is also configured to receive the actual temperature value T1 of the second heating zone and compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator. According to the comparison result, control the heating temperature of the second heating zone; The controller (50) controls the heating temperature of the second heating zone (14) by controlling the heating duty cycle of the second heating element (30); When T1 < T - M, the controller (50) controls the heating duty cycle of the second heating element (30) to be A / Y, where M is a control parameter, A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; When T - M ≤ T1 < T, the controller (50) controls the heating duty cycle of the second heating element (30) to be B / Y, where M is a control parameter, B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; When T ≤ T1 < T + N, the controller (50) controls the heating duty cycle of the second heating element (30) to be C / Y, where N is a control parameter, C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; Where, 0 < C < B < A ≤ Y; The evaporator further includes a water pump (60) and a water tank. The water pump (60) is connected to the water tank and the water inlet (15) through a pipeline. The water level probe (40) includes a long water level probe (41) and a short water level probe (42). The controller (50) is configured to control the duty cycle of the water pump (60) for pumping water, where When the long water level probe (41) does not detect water, the controller (50) controls the duty cycle of the water pump (60) to pump water as D / W, and the water pump (60) continuously pumps water, where D = W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time; When the short water level probe (42) detects water, the controller (50) controls the water pump (60) not to work; When the short water level probe (42) does not detect water and the long water level probe (41) detects water, the duty cycle of controlling the water pump (60) to pump water is D / W, where 0 < D < W, D is the continuous working time within a single pumping cycle, and W is the single pumping cycle time.

2. The evaporator according to claim 1, characterized in that The value of M ranges from 15 to 25 degrees Celsius, and the value of N ranges from 15 to 25 degrees Celsius.

3. The evaporator according to claim 1, characterized in that The evaporator is applied to a steam oven, and a steam oven temperature sensor (1) is provided in the steam oven to detect the actual temperature value T4 of the steam oven. The controller (50) is configured to compare the received actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven, and control the heating duty cycle of the first heating element (20) according to the comparison result.

4. The evaporator according to claim 3, characterized in that When T4 < T3, the controller (50) controls the heating duty cycle of the first heating element (20) to be X / Z, where X = Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; When T4 = T3, the controller (50) controls the heating duty cycle of the first heating element (20) to be X / Z, where 0 < X < Z, X is the continuous working time within a single heating cycle, and Z is the single heating cycle time; When T3 < T4 < T3 + P, the controller (50) controls the first heating element (20) to stop working, where P is a control parameter. The controller (50) controls the second heating element (30) to switch to the stage of T ≤ T1 < T + N, and controls the heating duty cycle of the second heating element (30) to be C / Y.

5. The evaporator according to claim 4, characterized in that P is 5 - 15 degrees Celsius.

6. The evaporator according to claim 1, characterized in that Both the first heating element (20) and the second heating element (30) are buried in the evaporator base (10).

7. The evaporator according to claim 1, characterized in that It further includes a first fin (18) and a second fin (19), which are provided corresponding to the first heating element (20) and the second heating element (30).

8. A steam oven, characterized in that: It includes the evaporator (100) described in any one of claims 1 - 7.

9. A control method applied to an evaporator, characterized in that: The evaporator includes: a first heating zone and a second heating zone, a first heating element and a second heating element corresponding to the first heating zone and the second heating zone, and a water level probe for detecting the water level in the first heating zone. The control method includes the following steps: Obtain the actual temperature value T1 of the second heating zone; Compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator, and control the heating duty cycle of the second heating element (30) according to the comparison result, thereby controlling the heating temperature of the second heating zone (14); Compare the actual temperature value T1 of the second heating zone with the preset temperature value T of the evaporator, and control the heating duty cycle of the second heating element (30) according to the comparison result, thereby controlling the heating temperature of the second heating zone (14), specifically including: When T1 < T - M, control the heating duty cycle of the second heating element (30) to be A / Y, where M is a control parameter, A is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; When T - M ≤ T1 < T, control the heating duty cycle of the second heating element (30) to be B / Y, where M is a control parameter, B is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; When T ≤ T1 < T + N, control the heating duty cycle of the second heating element (30) to be C / Y, where N is a control parameter, C is the continuous working time within a single heating cycle, and Y is the time of a single heating cycle; Among them, 0 < C < B < A ≤ Y are constants; The water level probe (40) includes a long water level probe (41) and a short water level probe (42), and the control method further includes: When the long water level probe (41) does not detect water, control the pumping duty cycle of the water pump (60) to be D / W, and the water pump (60) pumps water continuously, where D = W, D is the continuous working time within a single pumping cycle, W is the time of a single pumping cycle, and when the long water level probe (41) does not detect water for a preset time, send a water shortage alarm, stop the evaporator (100) from working, and refill the water tank; When the short water level probe (42) detects water, the water pump (60) does not work; When the short water level probe (42) does not detect water and the long water level probe (41) detects water, control the pumping duty cycle of the water pump (60) to be D / W, where 0 < D < W, D is the continuous working time within a single pumping cycle, and W is the time of a single pumping cycle.

10. The control method according to claim 9, characterized in that: The evaporator is applied to a steam oven and further includes: Obtain the actual temperature value T4 of the steam oven; Compare the actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven, and control the heating duty cycle of the first heating element (20) according to the comparison result.

11. The control method according to claim 10, characterized in that: Compare the actual temperature value T4 of the steam oven with the set temperature value T3 of the steam oven, and control the heating duty cycle of the first heating element (20) according to the comparison result, specifically including: When T4 < T3, control the heating duty cycle of the first heating element (20) to be X / Z, where X = Z, X is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle; When T4 = T3, control the heating duty cycle of the first heating element (20) to be X / Z, where 0 < X < Z is the continuous working time within a single heating cycle, and Z is the time of a single heating cycle; When T3 < T4 < T3 + P, control the first heating element (20) to stop working, where P is a control parameter, the second heating element (30) switches to the stage of T ≤ T1 < T + N, and control the heating duty cycle of the second heating element (30) to be C / Y.

12. A steam oven, characterized in that: Adopt the control method according to any one of claims 9 - 11.

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