阅读说明：本技术 蒸箱控制方法及蒸箱 (Steam box control method and steam box ) 是由 王玉鹏 王伟 方献良 于 2021-09-03 设计创作，主要内容包括：本发明公开了一种蒸箱控制方法及蒸箱。蒸箱包括蒸汽产生装置,蒸汽产生装置包括：底盘结构,以及设于底盘结构上的至少一组厚膜加热电阻丝,相邻的厚膜加热电阻丝独立盘绕或并行盘绕设置,温度采集单元,与每组厚膜加热电阻丝接触连接；蒸箱控制方法包括：控制厚膜加热电阻丝以第一功率进行加热；检测蒸箱实际温度值；在蒸箱实际温度值到达第一预设温度时,控制厚膜加热电阻丝停止发热；在蒸箱腔体内的实际温度值下降且低于第二预设温度时,控制厚膜加热电阻丝以第二功率加热预设时长。本发明的蒸汽产生装置极大地缩短了蒸箱产生蒸汽的时间,使蒸箱热效率更高,该发明的蒸箱控制方式,有效地缩短了烹饪时间,提升食物口感,提升了用户的使用体验。(The invention discloses a steam box control method and a steam box. The steam box includes a steam generating device, and the steam generating device includes: the device comprises a chassis structure and at least one group of thick film heating resistance wires arranged on the chassis structure, wherein adjacent thick film heating resistance wires are independently coiled or parallelly coiled, and a temperature acquisition unit is in contact connection with each group of thick film heating resistance wires; the steam box control method comprises the following steps: controlling the thick film heating resistance wire to heat at a first power; detecting an actual temperature value of the steam box; when the actual temperature value of the steam box reaches a first preset temperature, controlling the thick film heating resistance wire to stop heating; and when the actual temperature value in the cavity of the steam box is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire to heat for a preset time period at a second power. The steam generating device greatly shortens the time of generating steam by the steam box, so that the heat efficiency of the steam box is higher.)

1. The steam box control method is characterized by being used for controlling a steam box, wherein the steam box comprises a box body and a steam generating device, and the steam generating device is arranged in the box body;

the steam generating apparatus includes: the heating device comprises a chassis structure and at least one group of thick film heating resistance wires arranged on the chassis structure, wherein the adjacent thick film heating resistance wires are independently coiled or parallelly coiled, and each group of thick film heating resistance wires are connected to the same zero line; the temperature acquisition unit is in contact connection with each group of thick film heating resistance wires;

the steam box control method comprises the following steps:

controlling a thick film heating resistance wire of the steam box to heat at a first power;

detecting an actual temperature value in the cavity of the steam box;

when the actual temperature value in the cavity of the steam box reaches a first preset temperature, controlling the thick film heating resistance wire to stop heating;

when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire to be heated at a second power for a preset time;

wherein the first preset temperature is greater than the second preset temperature;

the first power is greater than the second power.

2. The steam box control method as claimed in claim 1, further comprising:

acquiring a temperature value of the surface of the steam generating device;

when the temperature value on the surface of the steam generating device reaches a preset temperature threshold value, controlling the thick film heating resistance wire to stop heating;

controlling a water pump of the steam box to pump a preset amount of water from a water tank of the steam box to the steam generating device;

the preset amount of water is determined according to the structural parameters of the box body of the steam box and the product parameters of the thick film heating resistance wire.

3. The steam box control method as claimed in claim 1, wherein the steam generating device comprises two groups of thick film heating resistance wires and is coiled in parallel;

when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, the step of controlling the thick film heating resistance wire to heat for a preset time with a second power comprises the following steps:

and when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire positioned at the inner periphery to heat for a preset time with the second power.

4. The steam box control method according to claim 1, wherein the temperature acquisition unit comprises temperature sensing wires, the temperature sensing wires are wound in parallel with the thick film heating resistance wires, all the thick film heating resistance wires are coated by the temperature sensing wires, and the temperature sensing wires are arranged on the chassis structure;

the steam box control method further comprises the following steps:

and controlling the temperature sensing wire to acquire the temperature data of the thick film heating resistance wire.

5. The steam box control method according to claim 1, wherein the temperature acquisition unit further comprises a temperature sensor, and the temperature sensor is arranged at a junction of the inner part of a circle formed by coiling the thick film heating resistance wire and is in contact with the thick film heating resistance wire;

the steam box control method further comprises the following steps:

and controlling the temperature sensor to acquire the temperature of the thick film heating resistance wire.

6. The steam box control method as claimed in claim 1, further comprising:

and receiving the temperature data of the temperature acquisition unit, and generating a first touch instruction according to the temperature data to drive the thick film heating resistance wire to generate heat.

7. The steam box control method as claimed in any one of claims 1 to 6, wherein the steam generating device comprises two sets of thick film heating resistance wires;

and the two groups of thick film heating resistance wires are arranged on the chassis structure in a parallel winding manner.

8. The steam box control method as claimed in claim 7, wherein the resistance wire power of the thick film heating resistance wire positioned at the periphery is greater than the resistance wire power of the thick film heating resistance wire positioned at the inner periphery; and/or the presence of a gas in the gas,

the thick film heating resistance wire and the temperature sensing wire form a first structure, and the first structure is far away from the chassis structure direction and sequentially comprises a stainless steel substrate layer, an inner insulating medium layer, a resistance wire resistance heating layer and an outer insulating medium layer.

9. The steam box control method according to any one of claims 1 to 6, wherein the steam generating device further comprises at least one temperature controller and a power supply module, wherein the temperature controller is in contact connection with the thick film heating resistance wire;

the steam box control method further comprises the following steps:

and controlling the temperature controller to collect temperature data of the thick film heating resistance wire and generate a second touch instruction to drive the power module to be powered off.

10. A steam box, comprising a box body and a steam generating device of the steam box according to any one of claims 1 to 9;

the steam generating device is arranged in the box body.

Technical Field

The invention relates to the technical field of intelligent household appliances, in particular to a steam box control method and a steam box.

Background

The steam ager can be quick production steam for food is surrounded by saturated steam fast in the steam ager for the culinary art time promotes the tender taste of food, becomes a trend more and more. The steam box performs cooking of food by heating water to generate water vapor, and thus the heating device is an essential part of the steam box. The existing technical scheme of the steam box for generating steam and the control method is to adopt an aluminum heating pipe, adopt a thermistor to detect the temperature and detect whether a heating disc has water or not, and is based on the simple control method of the heating device.

The existing steam box heating technical proposal is 15W/cm of an aluminum heating pipe²Due to the limitation of power density, the power of a heating device cannot be increased under the effective area of the heating plate, so that the steam cannot be rapidly generated. The existing steam box heating device has a water-free detection scheme and cannot be suitable for detecting a heating device which can generate steam quickly.

Disclosure of Invention

The invention aims to overcome the defect that a steam box heating device in the prior art is low in heating efficiency, and provides a steam box control method and a steam box.

The invention solves the technical problems through the following technical scheme:

the invention provides a steam box control method, which is used for controlling a steam box, wherein the steam box comprises a box body and a steam generating device, and the steam generating device is arranged in the box body;

the steam generating apparatus includes: the heating device comprises a chassis structure and at least one group of thick film heating resistance wires arranged on the chassis structure, wherein the adjacent thick film heating resistance wires are independently coiled or parallelly coiled, and each group of thick film heating resistance wires are connected to the same zero line; the temperature acquisition unit is in contact connection with each group of thick film heating resistance wires;

the steam box control method comprises the following steps:

controlling a thick film heating resistance wire of the steam box to heat at a first power;

detecting an actual temperature value in the cavity of the steam box;

when the actual temperature value in the cavity of the steam box reaches a first preset temperature, controlling the thick film heating resistance wire to stop heating;

when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire to be heated at a second power for a preset time;

wherein the first preset temperature is greater than the second preset temperature;

the first power is greater than the second power.

Preferably, the steam box control method further comprises the following steps:

acquiring a temperature value of the surface of the steam generating device;

when the temperature value on the surface of the steam generating device reaches a preset temperature threshold value, controlling the thick film heating resistance wire to stop heating;

controlling a water pump of the steam box to pump a preset amount of water from a water tank of the steam box to the steam generating device;

the preset amount of water is determined according to the structural parameters of the box body of the steam box and the product parameters of the thick film heating resistance wire.

Preferably, the steam generating device comprises two groups of thick film heating resistance wires which are coiled in parallel;

when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, the step of controlling the thick film heating resistance wire to heat for a preset time with a second power comprises the following steps:

and when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire positioned at the inner periphery to heat for a preset time with the second power.

Preferably, the temperature acquisition unit comprises temperature sensing wires, the temperature sensing wires are wound along with the thick film heating resistance wires in parallel, all the thick film heating resistance wires are wrapped by the temperature sensing wires, and the temperature sensing wires are arranged on the chassis structure;

the steam box control method further comprises the following steps:

and controlling the temperature sensing wire to acquire the temperature data of the thick film heating resistance wire.

Preferably, the temperature acquisition unit further comprises a temperature sensor, and the temperature sensor is arranged at a junction of the inner part of a circle formed by coiling the thick film heating resistance wire and is in contact with the thick film heating resistance wire;

the steam box control method further comprises the following steps:

and controlling the temperature sensor to acquire the temperature of the thick film heating resistance wire.

Preferably, the steam box control method further comprises the following steps:

and receiving the temperature data of the temperature acquisition unit, and generating a first touch instruction according to the temperature data to drive the thick film heating resistance wire to generate heat.

Preferably, the steam generating device comprises two groups of thick film heating resistance wires;

and the two groups of thick film heating resistance wires are arranged on the chassis structure in a parallel winding manner.

Preferably, the resistance wire power of the thick film heating resistance wire positioned at the periphery is greater than that of the thick film heating resistance wire positioned at the inner periphery; and/or the presence of a gas in the gas,

the thick film heating resistance wire and the temperature sensing wire form a first structure, and the first structure is far away from the chassis structure direction and sequentially comprises a stainless steel substrate layer, an inner insulating medium layer, a resistance wire resistance heating layer and an outer insulating medium layer.

Preferably, the steam generating device further comprises at least one temperature controller and a power supply module, wherein the temperature controller is in contact connection with the thick film heating resistance wire;

the steam box control method further comprises the following steps:

and controlling the temperature controller to collect temperature data of the thick film heating resistance wire and generate a second touch instruction to drive the power module to be powered off.

The invention also provides a steam box, which comprises a box body and the steam generating device of the steam box;

the steam generating device is arranged in the box body.

The positive progress effects of the invention are as follows:

the steam generating device of the steam box disclosed by the invention has the advantages that at least one group of thick film heating resistance wires are wound on the chassis, the thick film heating technology is applied to the steam box heating device, the thick film heating resistance wires are high in power density and short in heat conduction distance, so that the thermal resistance is small, the thermal response speed is high, the time for generating steam by the steam box is greatly shortened by applying the thick film heating technology, and the thermal efficiency of the steam box is higher; aiming at the characteristic that the thick film heating resistance wire is heated quickly after being dried, a double-detection water-free scheme is adopted to automatically acquire the temperature of the thick film heating resistance wire so as to monitor whether the steam box normally generates steam, so that the safety of the steam box is improved, and the use experience of a user is improved; steam ager control mode is through controlling thick film heating resistor silk and producing steam with great power fast, control thick film heating resistor silk and last the heating with less power when the temperature in the steam ager cavity falls to the second and predetermines the temperature, so that the steam ager both can produce steam fast and make the steam ager cavity reach and predetermine the temperature, can be again accurately with the temperature control in the steam ager cavity in the precision range of requirement, the effect of culinary art has greatly been improved, user's operation has been simplified, the whole product property ability and the market competition of steam ager have been promoted.

Drawings

Fig. 1 is a first schematic configuration diagram of a steam generating apparatus of a steam box according to embodiment 1 of the present invention.

Fig. 2 is a second schematic configuration diagram of the steam generating apparatus of the steam box of embodiment 1 of the present invention.

Fig. 3 is a third schematic view of a steam generating apparatus of a steam box according to embodiment 1 of the present invention.

Fig. 4 is a first flowchart of a steam box control method according to embodiment 1 of the present invention.

Fig. 5 is a second flowchart of the steam box control method according to embodiment 1 of the present invention.

Fig. 6 is a flowchart of a steam box control process in an example scenario of embodiment 1 of the present invention.

Fig. 7 is a schematic structural view of a steam box of embodiment 2 of the present invention.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

Example 1

As shown in fig. 1, the present embodiment provides a steam generating apparatus of a steam box. The steam generating apparatus includes: the heating device comprises a chassis structure 1 and at least one group of thick film heating resistance wires 2 arranged on the chassis structure 1, wherein adjacent thick film heating resistance wires are independently coiled or parallelly coiled, and each group of thick film heating resistance wires are connected to the same zero line 3; and the temperature acquisition unit 4 is in contact connection with each group of thick film heating resistance wires and is used for acquiring temperature data of the thick film heating resistance wires.

In an alternative embodiment, shown in figure 2, the steam generating means comprises two sets of thick film heating resistance wires 2; two groups of thick film heating resistance wires 2 are arranged on the chassis structure 1 in a parallel winding mode.

In another alternative embodiment, shown in figure 3, the steam generating means comprises two sets of thick film heating resistance wires 2; two groups of thick film heating resistance wires 2 are independently coiled on the chassis structure 1.

The resistance wire power of the thick film heating resistance wire 2 positioned at the periphery is larger than that of the thick film heating resistance wire 2 positioned at the inner periphery. Of course, the specific resistance wire power of different thick film heating resistance wires can be adjusted according to actual conditions.

In the circle formed by winding the thick film heating resistance wire 2, the thick film heating resistance wire 2 positioned at the periphery is positioned at the circular outer ring, and the thick film heating resistance wire 2 positioned at the inner periphery is positioned at the circular inner ring.

Specifically, the power density of the steam generating device can reach 60W/cm²To quickly heat water to generate steam. Wherein, the power density of the thick film heating resistance wire 2 positioned at the periphery can be 55W/cm²The power density is related to the rapid generation of steam in the cavity, and the thick film heating power is positioned at the inner peripheryThe power density of the resistance wire 2 can be about 55W/cm². The resistance wire power of the thick film heating resistance wire 2 positioned at the periphery is higher, and the thick film heating resistance wire is used for heating water to quickly generate water vapor in the cavity of the steam box; the resistance wire power of the thick film heating resistance wire 2 positioned on the inner periphery is smaller, the resistance wire power is used for reaching the preset temperature at the temperature of the steam box cavity, and when the thick film heating resistance wire 2 positioned on the periphery and having larger power stops heating, the thick film heating resistance wire 2 continuously heats with smaller power so that the steam in the steam box is maintained in a precision range required by the preset temperature. The design of two groups of thick film heating resistance wires with different powers enables the steam box to quickly generate steam and accurately control the temperature in the steam box.

In an alternative embodiment, the temperature acquisition unit 4 comprises a temperature sensing wire 5; the temperature induction wires 5 are coiled in parallel with the thick film heating resistance wires 2, all the thick film heating resistance wires 2 are coated by the temperature induction wires 5, and the temperature induction wires 5 are arranged on the chassis structure 1; the temperature sensing wire 5 is used for acquiring temperature data of the thick film heating resistance wire 2. Taking the steam generating device comprising two groups of thick film heating resistance wires 2 as an example, the temperature induction wire 5 is coiled into the circular inner part formed by coiling along with the thick film heating resistance wires 2 in the outer side of the thick film heating resistance wires 2 positioned at the periphery, and is coiled out from the circular inner part along with the thick film heating resistance wires 2 in the inner side of the thick film heating resistance wires 2 positioned at the periphery. The temperature sensing wire 5 is wound in parallel with the thick film heating resistance wire 2 and covers all the thick film heating resistance wires 2, so that the temperature of the thick film heating resistance wire 2 can be accurately measured, and the reliability of anhydrous detection of the steam generating device is ensured.

In another alternative embodiment, the temperature acquisition unit 4 further comprises a temperature sensor 6; the temperature sensor 6 is arranged at the junction of the inner part of the round shape formed by coiling the thick film heating resistance wire 2 and is contacted with the thick film heating resistance wire 2; the temperature sensor 6 is used for acquiring the temperature of the thick film heating resistance wire 2 so as to ensure the reliability of the detection of the steam generating device without water.

In this embodiment, the steam generating apparatus further comprises a controller; the controller is electrically connected with the temperature acquisition unit 4 and the thick film heating resistance wire 2, and the controller is used for receiving the temperature data and generating a first touch instruction according to the temperature data so as to drive the thick film heating resistance wire 2 to generate heat.

In an alternative embodiment, the steam generating device further comprises at least one thermostat 7 and a power module; the temperature controller is in contact connection with the thick film heating resistance wire 2; the temperature controller 7 is used for collecting temperature data of the thick film heating resistance wire 2 and generating a second touch instruction to drive the power supply module to be powered off. In order to prevent the occurrence of the unexpected situations that the temperature acquisition unit 4 cannot accurately acquire the temperature of the thick film heating resistance wire 2 or dry burning and the like, the temperature controller 7 acquires the temperature data of the thick film heating resistance wire 2 in real time and emergently drives the power supply module to be powered off when the temperature data exceeds a preset threshold value, so that the situation that the steaming box is damaged due to the fact that the temperature of the thick film heating resistance wire 2 is too high is prevented.

In an optional embodiment, the thick film heating resistance wire 2 and the temperature sensing wire 5 form a first structure, and the first structure sequentially comprises a stainless steel substrate layer, an inner insulating medium layer, a resistance wire resistance heating layer and an outer insulating medium layer in a direction away from the chassis structure. Taking the chassis structure arranged at the bottom of the steam box as an example, the first structure sequentially comprises a stainless steel substrate layer, an inner insulating medium layer, a resistance wire resistance heating layer and an outer insulating medium layer from top to bottom. The water flows into the upper surface of the stainless steel substrate layer and is heated into steam, and the stainless steel substrate layer has the characteristic of difficult scaling. The thick film heating resistance wire 2 and the temperature sensing wire 5 are coiled on the resistance wire to generate heat, the thickness of the inner insulating medium layer can be about 100 micrometers, and the heat conduction distance from the resistance heating layer to the stainless steel base material layer is short, so the heat resistance is very small, and the thermal response speed is very high. The first structure has the characteristics of high power density, small volume, durable pressure bearing, no power attenuation, quick thermal response, difficult scaling and high thermal conversion rate of more than 97%.

According to the steam generating device of the steam box, two groups of thick film heating resistance wires with different powers are wound on the chassis, the high-power thick film heating resistance wires quickly generate steam, the heat conduction distance is short, the thermal response speed is high, and the low-power thick film heating resistance wires accurately control the heating temperature, so that the steam generating time of the steam box is greatly shortened, the heat efficiency of the steam box is higher, and the intelligence degree and the safety of the steam box are improved; to the characteristics of rapid heating up after the thick film heating resistance wire dry combustion method, utilize temperature-sensing line, temperature sensor, temperature controller isothermal control component automatic acquisition thick film heating resistance wire's temperature, whether real time monitoring steam ager normally produces steam, improved the security of steam ager, promoted user's use and experienced.

As shown in fig. 4, the present embodiment further provides a steam box control method. The steam box control method is used for controlling the steam box comprising the box body and the steam generating device, and the steam generating device is arranged in the box body. The steam box control method comprises the following steps:

s101, controlling a thick film heating resistance wire of the steam box to heat with first power.

Specifically, when the actual temperature value in the cavity in the steam box does not reach a first preset temperature, the thick film heating resistance wire of the steam box is controlled to heat with a first power. Wherein, the first preset temperature can be 100 ℃, and the first power can be the maximum rated power of the steam box.

S102, detecting an actual temperature value in the cavity of the steam box.

S103, when the actual temperature value in the cavity of the steam box reaches a first preset temperature, controlling the thick film heating resistance wire to stop heating.

And S104, when the actual temperature value in the cavity of the steam box is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire to be heated at a second power for a preset time. Wherein the first preset temperature is greater than the second preset temperature; the first power is greater than the second power.

Specifically, when the actual temperature value in the cavity of the steam box reaches a first preset temperature, the thick film heating resistance wire stops heating, and the actual temperature value in the cavity of the steam box continuously decreases; when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, the thick film heating resistance wire of the steam box is controlled to be continuously heated for a preset time length at a second power, for example, when the temperature is lower than 98 ℃, the thick film heating resistance wire works for 20 seconds every 60 seconds and stops working for 40 seconds in a circulating and discontinuous mode, and the specific heating power and the specific heating time length can be determined according to actual needs, so that the steam in the steam box is maintained in the precision range required by the first preset temperature.

According to the steam box control method, the thick film heating resistance wire is controlled to rapidly generate steam with high power, the thick film heating resistance wire is controlled to stop heating when the temperature in the steam box cavity reaches the first preset temperature, the thick film heating resistance wire is controlled to continuously heat with low power when the temperature in the steam box cavity drops to the second preset temperature, so that the steam box can rapidly generate steam to enable the steam box cavity to reach the preset temperature, the temperature in the steam box cavity can be accurately controlled within the required precision range, the cooking effect is greatly improved, the operation of a user is simplified, and the use experience of the user is improved.

In an alternative embodiment, as shown in fig. 5, the steam box control method further includes:

s201, obtaining a temperature value of the surface of the steam generating device.

S202, when the temperature value of the surface of the steam generating device reaches a preset temperature threshold value, controlling the thick film heating resistance wire to stop heating.

Specifically, whether the steam generating device is dry-burned or not is judged by detecting whether the temperature value of the surface of the steam generating device reaches a preset temperature threshold value or not. For example, when the temperature value on the surface of the steam generating device is detected to reach 108 ℃ from 103 ℃, the water of the steam generating device is judged to be completely evaporated, the condition of dry burning is generated, and the thick film heating resistance wire is immediately controlled to stop heating so as to prevent the steam box from being damaged.

S203, controlling a water pump of the steam box to pump a preset amount of water from a water tank of the steam box to a steam generating device; the preset amount of water is determined according to the structural parameters of the box body of the steam box and the product parameters of the thick film heating resistance wire.

Specifically, the preset amount of water pumping each time is determined by parameters such as the volume of the steam box cavity, the power of the thick film heating resistance wire, the power density and the size, and preferably, the preset amount of water pumping each time is to ensure that the steam temperature in the steam box cavity reaches the first preset temperature once. The preset amount of water pumped in each time is mainly determined by the water pumping efficiency and the water pumping time, for example, the water pumping amount is 160ml (milliliters), the water pumping amount of the water pump per second is maintained at 10ml, namely the water pumping time is 16 seconds and then is finished.

In an alternative embodiment, the steam generating means comprises two sets of thick film heating resistance wires.

Step S104 includes:

s1041, when the actual temperature value in the steam box cavity is reduced and is lower than a second preset temperature, controlling the thick film heating resistance wire positioned at the inner periphery to heat for a preset time length with a second power. The thick film heating resistance wire positioned at the periphery is controlled to stop heating in step S103, and at this time, the thick film heating resistance wire positioned at the periphery is not controlled to heat, so that electric energy can be saved and loss of the thick film heating resistance wire positioned at the periphery can be reduced.

According to the steam box control method, the two groups of thick film heating resistance wires are controlled to rapidly generate steam with high power, the two groups of thick film heating resistance wires are controlled to stop heating when the temperature in the cavity of the steam box reaches a first preset temperature, and the thick film heating resistance wires positioned at the inner periphery are controlled to continuously heat with low power when the temperature in the cavity of the steam box drops to a second preset temperature, so that the steam box can rapidly generate steam to enable the cavity of the steam box to reach the preset temperature, the temperature in the cavity of the steam box can be accurately controlled within a required precision range, and the cooking effect is greatly improved; the temperature value on the surface of the steam generating device is monitored in real time, water is added immediately when dry burning occurs, the safety of the steam box is improved, the operation of a user is simplified, and the use experience of the user is improved.

The operation principle of the steam box control method of the present embodiment is specifically described below with reference to examples. As shown in fig. 6, an alternative steam box control method includes the following steps:

(1) starting a steam box, carrying out initialization setting on the steam box, and enabling the steam box to be in a standby state;

(2) and controlling a steam box water pump to pump water from a steam box water tank to the surface of the steam generation device, wherein the water pumping amount is 160ml, and the water pumping amount of the water pump is kept at 10ml per second, namely the water pumping is finished after the water pumping time is 16 s. The water pumping quantity is related to the volume of the cavity of the steam box and the power, the power density and the size of the steam generating device. Preferably, the water is added once, so that the steam temperature in the cavity of the steam box can reach 100 ℃ once.

(3) And controlling a water pump of the steam box to be closed, and controlling two groups of thick film heating resistance wires of the steam generating device to work. After the steam generating device starts to work, because the effective area internal power is large, the heat conduction distance is short, and the thermal resistance is small, water in the steam box inner container is rapidly heated, steam is generated in a second level, and saturated steam is rapidly generated in the steam box cavity to surround food to be cooked in the steam box.

(4) And controlling two groups of thick film heating resistance wires of the steam generating device to stop working until the steam in the cavity of the steam box reaches 100 ℃, and controlling the thick film heating resistance wires positioned at the inner periphery of the steam generating device to work according to the temperature change in the cavity and the threshold value of the temperature precision required to be controlled, so that the steam in the steam box is maintained in the precision range required by 100 ℃.

(5) When the temperature sensor and the temperature induction line detect randomly to reach the set threshold value, the surface or the local part of the steam generating device does not have water, the thick film heating resistance wire of the steam generating device is controlled to stop working, and the water pump of the steam box is controlled to add water.

(6) When the water inlet time reaches a threshold value, the water pump is turned off, the temperature in the cavity is judged, and the thick film heating resistance wire positioned at the inner periphery is controlled to work according to the temperature change in the cavity and the threshold value of the temperature precision required to be controlled, so that the steam in the steam box is maintained in the precision range required by 100 ℃.

(7) And (5) circulating to (6) until the whole cooking process of the steam box is finished.

Example 2

As shown in fig. 7, the present embodiment provides a steam box, comprising a box body 8 and a steam generating device 9 in embodiment 1 or embodiment 2; the steam control device 9 is arranged inside the box body.

The steam box can also comprise other components such as a water tank, a water pump, a water pipe and the like; the water tank and the water pump are arranged outside the box body, the water tank and the water pump are connected to the steam generating device through water pipes, and the water pump is electrically connected with a controller of the steam generating device; the controller is used for controlling the water pump to pump water from the water tank to the steam generating device of the steam generating device.

In an alternative embodiment, the steam box further comprises a display, the display is arranged outside the box body, and the display is electrically connected with the controller. The controller may send display information to the display to show the display information, and the display information may include, but is not limited to, at least one of time, temperature, humidity, pressure, and the like, so as to facilitate a user to know the operating state of the steam cooking appliance in time.

In another optional embodiment, the steam box further comprises an alarm, the alarm is arranged outside the box body, and the alarm is electrically connected with the controller. When the steam displacement exceeds the displacement threshold value, the controller can control the alarm to send out an alarm signal so as to prompt a user to take a countermeasure in time, such as disconnecting the power supply of the steam cooking appliance. The alarm 3 may be, for example, a photoelectric alarm, a voice alarm, or the like.

The steam box of the embodiment greatly shortens the time for generating steam by utilizing the steam generating device, so that the heat efficiency of the steam box is higher, the cooking time can be shortened by half or even more, and the use experience of a user is improved; the scheme of double detection of water existence is adopted to monitor whether the steam box normally generates steam, so that the safety of the steam box is improved, and the reliability and the competitiveness of the product are improved.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.