Control method of steam generator

Abstract

The control method of the steam generator comprises the following steps that in response to a steam generation instruction of the steam generator, water is injected into a heating cavity; after the heating starting condition is met, the heating structure is controlled to conduct heating operation; the temperature of the heating structure is monitored, the water flow control structure is controlled to inject water into the heating cavity according to the temperature until a stop signal is received, the heating structure stops working, and the water flow control structure stops injecting water into the heating cavity; the temperature of the heating structure in the steam generator is monitored, the water flow control structure is controlled to inject water into the heating cavity according to the temperature, it is guaranteed that enough water exists in the heating cavity of the steam generator, dry burning caused by insufficient water is avoided, and the good steam generation effect is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generators, and in particular to a control method for a steam generator. Background Art

[0002] Current steam cooking devices, such as all-in-one steamers, steam ovens, steam boxes, etc., mostly use a separate water box to generate steam. Water is pumped into a steam generator with an electric heating device through a water pump, and then the steam generated by the steam generator is introduced into the cooking chamber of the steam cooking device. In the steam generation module, the water level control is mostly to indirectly judge the water level in the pipeline through the water level control module. The water level control module is mostly in the form of a float or a water level probe. In actual use, due to the small space in the water box, the float method is prone to jamming of the float, resulting in inaccurate water level judgment; and the water level probe requires that the water is rich in ions, and the misjudgment rate is high when used in pure water. Summary of the invention

[0003] The object of the present invention is to provide a control method for a steam generator capable of reliably and accurately judging the water level.

[0004] In order to achieve the above objectives, the following technical solutions are provided:

[0005] The present invention provides a control method for a steam generator, comprising the following steps:

[0006] In response to a steam generation instruction to the steam generator, injecting water into the heating chamber;

[0007] After the heating start condition is met, the heating structure is controlled to perform the heating operation;

[0008] The temperature of the heating structure is monitored, and the water flow control structure is controlled to inject water into the heating chamber according to the temperature, until a stop signal is received, the heating structure stops working, and the water flow control structure stops injecting water into the heating chamber.

[0009] Preferably, after the heating start condition is met, the heating start condition is that the water level in the heating chamber reaches the maximum water level, including:

[0010] According to the highest water level in the heating chamber, calculate the required water injection volume V1;

[0011] Then calculate the time t0 required for water injection based on the water injection volume V1 and the water injection speed;

[0012] The water injection time is recorded as t1. When t1=t0, the water level in the heating chamber reaches the highest water level, and the water flow control structure stops injecting water into the heating chamber.

[0013] Preferably, after the heating start condition is met, the heating start condition is that the water level in the heating chamber reaches the maximum water level, including:

[0014] When the overflow detection device detects that water flows out through the overflow port, the water flow control structure stops injecting water into the heating chamber.

[0015] Preferably, monitoring the temperature of the heating structure and controlling the water flow control structure to inject water into the heating chamber according to the temperature until a stop signal is received comprises:

[0016] The temperature monitoring structure monitors the temperature of the heating structure and is recorded as Ta;

[0017] Controlling the water flow control structure to inject water into the heating chamber according to the temperature Ta of the heating structure, thereby maintaining the temperature Ta of the heating structure within the temperature threshold range until a stop signal is received;

[0018] When Ta≥the maximum value of the temperature threshold range, the water flow control structure is started to inject water into the heating chamber, and when Ta≤the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber.

[0019] Preferably, when Ta≤the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber, including:

[0020] When the temperature monitoring structure detects that the temperature Ta of the heating structure is less than or equal to the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber after maintaining the water injection time t2.

[0021] Preferably, monitoring the temperature of the heating structure and controlling the water flow control structure to inject water into the heating chamber according to the temperature until a stop signal is received comprises:

[0022] The temperature monitoring structure monitors the temperature of the heating structure, which is denoted as Tb;

[0023] The temperature of the heating structure before the monitoring structure at a unit time t3 is retrieved and recorded as Tc;

[0024] Calculate the temperature change rate within unit time t3 based on Tb, Tc and unit time t3, and record it as v1;

[0025] According to the temperature change speed v1 of the heating structure, the water flow control structure is controlled to inject water into the heating chamber, thereby maintaining the temperature change speed v1 of the heating structure to meet the temperature change speed threshold range until a stop signal is received;

[0026] When v1≥the maximum value of the temperature change rate threshold range, the water flow control structure is started to inject water into the heating chamber, and when v1≤the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber.

[0027] Preferably, when v1≤the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber, including:

[0028] When v1≤the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber after maintaining the water injection for t4 time.

[0029] Preferably, after receiving the stop signal, the water flow control structure is controlled to discharge the water in the steam generator out of the steam generator.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention discloses a control method for a steam generator, which monitors the temperature of a heating structure in the steam generator and controls a water flow control structure to inject water into a heating chamber according to the temperature, thereby ensuring that there is enough water in the heating chamber of the steam generator, avoiding dry burning caused by insufficient water, and ensuring a better steam generation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0033] Figure 1 It is a structural schematic diagram of the steam generator of the present invention;

[0034] Figure 2 is a schematic cross-sectional structure diagram of a steam generator of the present invention;

[0035] Figure 3 It is a structural schematic diagram of a partial structure of the steam generator of the present invention.

[0036] Reference numerals:

[0037] 1-heating structure; 11-heating container; 12-heating element; 13-heating chamber; 14-temperature monitoring structure; 15-first water inlet; 16-first steam outlet;

[0038] 2-water vapor separation structure; 21-separation chamber; 22-second water inlet; 23-second steam outlet; 24-first steam inlet; 25-overflow port;

[0039] 3-connecting structure; 31-connecting cavity; 32-first water outlet; 33-second water outlet; 34-third water inlet; 35-third water outlet;

[0040] 4-water flow control structure; 41-first water pump; 42-second water pump;

[0041] 5-housing; 51-thermostat. DETAILED DESCRIPTION

[0042] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of the present invention, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] The present application provides a control method for a steam generator, the structure of the steam generator is as follows:

[0047] like Figures 1 to 3 As shown, a steam generator comprises:

[0048] A heating structure 1, the heating structure 1 comprises a heating container 11 and a heating element 12, and a heating chamber 13 is provided in the heating container 11;

[0049] The water vapor separation structure 2 is used to discharge the steam generated by the heating structure 1;

[0050] The communication structure 3 can be used to supply water to the heating structure 1 and the water vapor separation structure 2;

[0051] A water flow control structure 4, capable of supplying water to the communication structure 3;

[0052] The heating structure 1 also includes a temperature monitoring structure 14 for monitoring temperature changes, and controls the water supply of the water flow control structure 4 according to the monitored temperature changes; one side of the temperature monitoring structure 14 is attached to the heated container 11 or the heating element 12.

[0053] The present application controls the water supply of the water flow control structure 4 by monitoring the temperature change detection of the heating structure 1 through the temperature monitoring structure 14. After detecting that the heating structure reaches a preset temperature, the water flow control structure 4 is controlled to supply water, thereby ensuring a better water supply control effect, avoiding excessive dry burning due to too little water in the heating structure 1, and delaying the service life of the heating structure 1.

[0054] In this embodiment, the temperature monitoring structure 14 is an NTC device embedded in the heating element 12, which directly monitors the temperature change of the heating element 12 and has a high monitoring accuracy. In other embodiments, the NTC device can also be embedded in the heated container 11. Since the temperature of the heated container 11 is transmitted by the heating element 12, it is easily affected by environmental factors and has a low monitoring accuracy. In other embodiments, the temperature monitoring structure 14 can also be an infrared temperature sensor, a thermocouple, a thermal resistor, a thermistor, a temperature sensing chip, a thermometer, etc.

[0055] In this embodiment, it is first necessary to preset the temperatures of the highest water level and the lowest water level in the heating chamber 13 when the heating structure 1 is working, and form a temperature threshold range, the maximum value of the temperature threshold range is the preset temperature when the water level in the heating chamber 13 is at the lowest water level, and the minimum value of the temperature threshold range is the preset temperature when the water level in the heating chamber 13 is at the highest water level; therefore, when the heating structure 1 is working, the temperature data monitored by the temperature monitoring structure 14 is maintained within the temperature threshold range; when the temperature monitored by the monitoring structure 14 is ≥ the maximum value of the temperature threshold range, the water flow control structure 4 is controlled to supply water, and when the temperature monitored by the monitoring structure 14 is ≤ the minimum value of the temperature threshold range, the water flow control structure 4 is stopped from supplying water, and then the water level in the heating chamber is monitored by monitoring the temperature change, thereby reducing the dry burning of the heating structure, ensuring a better steam generation effect, and extending the service life.

[0056] In this application, the highest water level refers to the highest position where the water level in the heating chamber of the steam generator meets working requirements under normal working conditions; the lowest water level refers to the lowest position where the water level in the heating chamber of the steam generator meets working requirements under normal working conditions.

[0057] Furthermore, at least a portion of the heating surface of the heating element 12 is attached to the outer side of the heated container 11 , and the heating element 12 is disposed around the heated container 11 .

[0058] The heating surface of the heating element 12 is attached to the outer side of the heated container 11, which can better heat the heated container 11 and reduce heat loss.

[0059] In this embodiment, the heating element 12 is a thin film heating sheet, and the thin film heating sheet is wrapped around the outside of the heated container 11 to ensure a better heating effect. In other embodiments, the heating element 12 can also be a heating structure such as a heating tube.

[0060] Furthermore, the heating container 11 is provided with a first water inlet 15 and a first steam outlet 16 connected to the heating chamber 13;

[0061] A separation chamber 21 is provided in the water vapor separation structure 2. A second water inlet 22, a second steam outlet 23 and a first steam inlet 24 connected to the separation chamber 21 are provided on the water vapor separation structure 2. The second steam outlet 23 is used to output steam.

[0062] The second steam outlet 23 needs to be higher than the highest water level in the heating chamber 13 .

[0063] In other embodiments, a baffle, a filter, etc. may be provided at the first steam inlet 24 to intercept condensed water droplets in the steam flow, thereby improving the effect of water vapor separation, reducing the condensed water content in the steam output from the second steam outlet 23, and ensuring better steam quality.

[0064] A connecting cavity 31 is provided in the connecting structure 3, and a first water outlet 32, a second water outlet 33 and a third water inlet 34 connected to the connecting cavity 31 are provided on the connecting structure 3; the third water inlet 34 is connected to the water flow control structure 4, and the water flow control structure 4 can be used to inject water into the connecting cavity 31;

[0065] The first water outlet 32 ​​is connected to the first water inlet 15 , the first steam outlet 16 is connected to the first steam inlet 24 , and the second water inlet 22 is connected to the second water outlet 33 .

[0066] Through the water vapor separation structure 2, condensed water droplets in the steam can be separated from the steam when the steam flows through the separation chamber 21, thereby improving the steam quality; the heating chamber and the separation chamber are both connected to the connecting chamber, and the first steam outlet 16 is connected to the first steam inlet 24. The principle of a connecting vessel is adopted between the heating chamber and the separation chamber, so the water level in the heating chamber and the water level in the separation chamber are always consistent.

[0067] Furthermore, the water flow control structure 4 includes a first water pump 41 , a water outlet of the first water pump 41 is connected to the third water inlet 34 , a water inlet of the first water pump 41 is connected to a water source, and the first water pump 41 delivers water from the water source into the connecting cavity 31 .

[0068] The connecting structure 3 is also provided with a third water outlet 35 connected to the connecting cavity 31, and the water flow control structure 4 also includes a second water pump 42; the third water outlet 35 is also connected to the water inlet of the second water pump 42, and the water outlet of the second water pump 42 is connected to the water receiving container, and the second water pump 42 delivers water from the connecting cavity 31 into the water receiving container.

[0069] Water is supplied to the connecting chamber 31 through the first water pump 41, and then the water is sent into the heating chamber 13 and the separation chamber 21 through the connecting chamber 31, thereby realizing the water supply function of the water flow control structure 4; water is pumped from the connecting chamber 31 through the second water pump 42. As the amount of water in the connecting chamber 31 decreases, the water in the heating chamber 13 and the separation chamber 21 will be replenished into the connecting chamber 31 until the heating chamber 13 and the separation chamber 21 are full of water, thereby realizing the water pumping function of the water flow control structure 4.

[0070] After the use of the steam generator is over, the water is pumped away by the second water pump 42 to prevent water from being retained in the connecting chamber 31, the heating chamber 13 and the separation chamber 21 for a long time, thereby preventing bacteria from growing and causing odors, thereby improving the user experience. In addition, water retained in the connecting chamber 31, the heating chamber 13 and the separation chamber 21 for a long time is prone to scale formation, especially in the heating chamber 13. Scale is easily generated when heating water, and scale adhering to the chamber wall will not only affect the heating effect, but also reduce the accuracy of temperature monitoring.

[0071] Therefore, in this embodiment, the connecting chamber 31, the heating chamber 13 and the separation chamber 21 can be cleaned by repeatedly injecting water through the first water pump 41 and pumping water through the second water pump 42, and most of the scale can be removed. More stubborn scale can be removed by adding an acidic detergent.

[0072] Furthermore, the water vapor separation structure 2 is also provided with an overflow port 25 connected to the separation chamber 21 , and the overflow port 25 is located below the second steam outlet 23 .

[0073] The overflow port 25 is higher than the highest water level in the heating chamber 13, and at least part of the overflow port 25 is lower than the second steam outlet 23; it can ensure that the water level in the heating chamber 13 can reach the highest water level line, and when the temperature monitoring structure 14 fails or the water level in the heating chamber 13 exceeds the highest water level line due to other reasons and the water flow control structure 4 does not stop injecting water, water will be discharged through the second steam outlet 23, affecting the steam quality and user experience.

[0074] In this embodiment, the lowest point at the overflow port 25 is flush with the highest water level. In other embodiments, the lowest point at the overflow port 25 may be higher than the highest water level.

[0075] In this embodiment, the overflow port 25 is connected to the water receiving container through a pipeline; in other embodiments, the overflow port 25 can be connected to one of the connecting chamber 31, the heating chamber 13 and the separation chamber 21 through a pipeline.

[0076] In other embodiments, a blocking structure for preventing steam leakage may be provided at the overflow port 25; for example, a floating plate may be provided at the overflow port 25, and the floating plate may be movable in a vertical direction. When water flows through the overflow port 25, the water will lift up the floating plate, thereby not affecting the overflow of water; and when the water does not overflow, the floating plate closes the overflow port 25, and steam will not leak from the overflow port 25.

[0077] The present application also includes a shell 5 , the heating structure 1 , the water vapor separation structure 2 and the connecting structure 3 are all located in the shell 5 , and a heat preservation layer is provided on the shell 5 .

[0078] The insulation layer reduces heat loss and reduces power consumption.

[0079] Furthermore, a temperature controller 51 is provided on the shell, and one side of the temperature controller 51 is attached to the heated container 11 or the heating element 12 . The temperature controller 51 can be used to control the heating structure 1 .

[0080] Through the thermostat 51, when the temperature on the heated container 11 or the heating element 12 exceeds the thermostat limit, the power supply of the steam generator will be directly cut off to ensure safety during use; in this embodiment, one side of the thermostat is attached to the heated container 11, and in other embodiments, one side of the thermostat is attached to the heating element 12.

[0081] The control method for the steam generator in the present application comprises the following steps:

[0082] In response to a steam generation instruction to the steam generator, water is injected into the heating chamber 13;

[0083] After the heating start condition is met, the heating structure 1 is controlled to perform a heating operation;

[0084] The temperature of the heating structure 1 is monitored, and the water flow control structure 4 is controlled to inject water into the heating chamber 13 according to the temperature, until a stop signal is received, the heating structure 1 stops working, and the water flow control structure 4 stops injecting water into the heating chamber 13 .

[0085] The temperature of the heating structure in the steam generator is monitored, and the water flow control structure 4 is controlled to inject water into the heating chamber 13 according to the temperature to ensure that there is enough water in the heating chamber 13 of the steam generator to avoid dry burning caused by insufficient water and ensure a better steam generation effect.

[0086] In this embodiment, the heating start condition is that the water level in the heating chamber 13 reaches the maximum water level, and the steps of determining that the water level in the heating chamber 13 reaches the maximum water level include:

[0087] According to the highest water level in the heating chamber 13, the required water injection volume V1 is calculated;

[0088] Then calculate the time t0 required for water injection based on the water injection volume V1 and the water injection speed;

[0089] The water injection time is recorded as t1. When t1=t0, the water level in the heating chamber 13 reaches the highest water level, and the water flow control structure 4 stops injecting water into the heating chamber 13.

[0090] The water injection time is calculated for the first time based on the required water injection volume V1, and the water injected into the heating chamber 13 is accurately controlled. This can not only prevent water from overflowing from the second steam outlet 23 to the outside of the steam generator due to excessive water injection, thereby affecting the user experience, but may also cause malfunctions of other components due to water ingress; it can also prevent the heating structure 1 from dry burning due to insufficient water injection, thereby affecting the service life of the heating structure 1, and making it easier to produce scale in the heating chamber 13, hindering heat transfer and affecting the steam generation effect.

[0091] Further, after the heating start condition is met, the heating start condition is that the water level in the heating chamber 13 reaches the maximum water level, including:

[0092] When the overflow detection device detects that water flows out through the overflow port 25 , the water flow control structure 4 stops injecting water into the heating chamber 13 .

[0093] Through the overflow port 25, when the water injected into the heating chamber 13 and the separation chamber 21 exceeds the maximum water level, at least part of the water exceeding the maximum water level will flow out from the overflow port 25, and then the water level in the heating chamber 13 and the separation chamber 21 will drop, ensuring that no water will overflow from the second steam outlet 23, ensuring a better user experience, and preventing the water overflowing from the second steam outlet 23 from affecting the normal operation of other electronic components.

[0094] When the overflow detection device detects that water flows out of the overflow port 25, it means that the water level in the heating chamber 13 has exceeded the maximum water level, and the water flow control structure 4 is directly controlled to stop water injection, thereby achieving a safeguard function during the water injection control process.

[0095] In this embodiment, the temperature of the heating structure 1 is monitored, and the water flow control structure 4 is controlled to inject water into the heating chamber 13 according to the temperature until a stop signal is received, including:

[0096] The temperature monitoring structure monitors the temperature of the heating structure 1 and is recorded as Ta;

[0097] According to the temperature Ta of the heating structure 1, the water flow control structure 4 is controlled to inject water into the heating chamber 13, thereby maintaining the temperature Ta of the heating structure 1 within the temperature threshold range until a stop signal is received;

[0098] When Ta≥the maximum value of the temperature threshold range, the water flow control structure 4 is started to inject water into the heating chamber 13 , and when Ta≤the minimum value of the temperature threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13 .

[0099] In the present application, intermittent water injection is adopted to maintain the water level in the heating chamber 13 between the highest water level and the lowest water level, and a better steam generation speed and a better steam quality can be guaranteed during the period of stopping water injection. While having a better steam quality and steam generation speed, the water injection pressure of the water flow control structure 4 is also reduced, thereby extending the service life of the water flow control structure 4. If a continuous water injection scheme is adopted, the water injection speed needs to be adjusted to be equal to the water consumption speed, which has a greater calculation pressure on the controller, and continuous water injection will cause the water temperature in the heating chamber 13 to be unstable, the steam generation speed will be affected, and the steam quality will also be poor.

[0100] In this embodiment, when the water level in the heating chamber 13 is at the highest water level, the heating structure 1 needs to increase the temperature of the water to the boiling point, and the heat is transferred from the heating structure 1 to the water. During the transfer process, the heat is lost, and the specific heat capacity of water is large, which leads to a lower temperature of the heating structure 1 at this time, and the detected temperature is recorded as Td; when the water level in the heating chamber 13 is between the highest water level and the lowest water level, the water temperature has reached the upper limit at this time. Since part of the water is converted into steam and discharged, the water volume decreases, and part of the heating structure 1 cannot directly transfer heat with the water, resulting in heat accumulation, and the temperature of the heating structure 1 will increase. As the water level decreases, the accumulated heat will increase; when the water level in the heating chamber 13 is at the lowest water level, the accumulated heat is the largest, and the detected temperature is recorded as Te, Te>Td; therefore, the position of the water level in the heating chamber 13 can be determined by monitoring the change of the temperature Ta of the heating structure 1, and it is less affected by factors. The controller can calculate the position of the water level according to the temperature value, so as to more accurately determine the time to inject water into the heating chamber 13, and better maintain the water level in the heating chamber 13 between the highest water level and the lowest water level.

[0101] Further, when Ta≤the minimum value of the temperature threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13, including the following steps:

[0102] When the temperature monitoring structure detects that the temperature Ta of the heating structure 1 is less than or equal to the minimum value of the temperature threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13 after maintaining the water injection time t2.

[0103] When the controller determines that the water level in the heating chamber 13 has reached the maximum water level, continuing to inject water for t2 time can effectively avoid the influence of the low temperature of the heating structure 1 caused by the low temperature of the injected water on the water level judgment, and better ensure that the water level when stopping water injection can be closer to the maximum water level, thereby reducing the influence on steam generation.

[0104] In another embodiment, monitoring the temperature of the heating structure 1 and controlling the water flow control structure 4 to inject water into the heating chamber 13 according to the temperature until a stop signal is received includes:

[0105] The temperature monitoring structure monitors the temperature of the heating structure 1, which is denoted as Tb;

[0106] The temperature of the heating structure 1 of the monitoring structure before a unit time t3 is retrieved and recorded as Tc;

[0107] Calculate the temperature change rate within unit time t3 based on Tb, Tc and unit time t3, and record it as v1;

[0108] According to the temperature change speed v1 of the heating structure 1, the water flow control structure 4 is controlled to inject water into the heating chamber 13, thereby maintaining the temperature change speed v1 of the heating structure 1 to meet the temperature change speed threshold range until a stop signal is received;

[0109] When v1≥the maximum value of the temperature change rate threshold range, the water flow control structure 4 is started to inject water into the heating chamber 13 , and when v1≤the minimum value of the temperature change rate threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13 .

[0110] In this embodiment, when the water level in the heating chamber 13 is at the highest water level, the heating structure 1 needs to increase the temperature of the water to the boiling point, and the heat is transferred from the heating structure 1 to the water. During the transfer process, the heat is lost, and the specific heat capacity of water is large, which leads to a slow overall temperature rise. The detected temperature change rate is recorded as v2; when the water level in the heating chamber 13 is between the highest water level and the lowest water level, the water temperature has reached the upper limit. Since part of the water is converted into steam and discharged, the water volume decreases, and part of the heating structure 1 cannot directly transfer heat with the water, resulting in heat accumulation, and the heating structure 1 The temperature will rise and as the water level drops, more and more heat will be accumulated; when the water level in the heating chamber 13 is at the lowest level, the accumulated heat is the most, and the detected temperature change rate is recorded as v3, v3>v2; therefore, the position of the water level in the heating chamber 13 can be determined by monitoring the change in the temperature Ta of the heating structure 1, and there are fewer influencing factors. The controller can calculate the position of the water level according to the rate of temperature change, thereby more accurately determining the time to inject water into the heating chamber 13, and better maintaining the water level in the heating chamber 13 between the highest water level and the lowest water level.

[0111] Further, when v1≤the minimum value of the temperature change rate threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13, including the following steps:

[0112] When v1 ≤ the minimum value of the temperature change rate threshold range, the water flow control structure 4 stops injecting water into the heating chamber 13 after maintaining the water injection time t4.

[0113] When the controller determines that the water level in the heating chamber 13 has reached the maximum water level, continuing to inject water for t4 time can effectively avoid the influence of the low temperature of the heating structure 1 on the water level judgment caused by the low temperature of the injected water, and better ensure that the water level when stopping water injection can be closer to the maximum water level, thereby reducing the influence on steam generation.

[0114] Further, in the present application, after receiving the stop signal, the water flow control structure 4 is controlled to discharge the water in the steam generator out of the steam generator.

[0115] After the use of the steam generator is over, the water is pumped out to prevent water from being retained in the connecting chamber 31, the heating chamber 13 and the separation chamber 21 for a long time, which may cause bacteria growth, odor and the like, thereby improving the user experience. Moreover, water retained in the connecting chamber 31, the heating chamber 13 and the separation chamber 21 for a long time may easily form scale, especially in the heating chamber 13. Scale is easily generated when heating water, and scale adhering to the chamber wall will not only affect the heating effect, but also reduce the accuracy of temperature monitoring.

[0116] Note that in the description of this specification, the description with reference to the terms "one embodiment", "in other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0117] The above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for controlling a steam generator, It is characterized in that The following steps are involved: In response to a steam generation instruction to the steam generator, injecting water into the heating chamber; After the heating start condition is met, the heating structure is controlled to perform the heating operation; The temperature of the heating structure is monitored, and the water flow control structure is controlled to inject water into the heating chamber according to the temperature, until a stop signal is received, the heating structure stops working, and the water flow control structure stops injecting water into the heating chamber.

2. The steam generator control method according to claim 1, It is characterized in that After the heating start condition is met, the heating start condition is that the water level in the heating chamber reaches the maximum water level, including: According to the highest water level in the heating chamber, calculate the required water injection volume V1; Then calculate the time t0 required for water injection based on the water injection volume V1 and the water injection speed; The water injection time is recorded as t1. When t1=t0, the water level in the heating chamber reaches the highest water level, and the water flow control structure stops injecting water into the heating chamber.

3. The control method of the steam generator according to claim 1, It is characterized in that After the heating start condition is met, the heating start condition is that the water level in the heating chamber reaches the maximum water level, including: When the overflow detection device detects that water flows out through the overflow port, the water flow control structure stops injecting water into the heating chamber.

4. The control method of the steam generator according to claim 1, It is characterized in that The process of monitoring the temperature of the heating structure and controlling the water flow control structure to inject water into the heating chamber according to the temperature until a stop signal is received includes: The temperature monitoring structure monitors the temperature of the heating structure and is recorded as Ta; Controlling the water flow control structure to inject water into the heating chamber according to the temperature Ta of the heating structure, thereby maintaining the temperature Ta of the heating structure within the temperature threshold range until a stop signal is received; When Ta≥the maximum value of the temperature threshold range, the water flow control structure is started to inject water into the heating chamber, and when Ta≤the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber.

5. The control method of the steam generator according to claim 4, It is characterized in that When Ta≤the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber, including: When the temperature monitoring structure detects that the temperature Ta of the heating structure is less than or equal to the minimum value of the temperature threshold range, the water flow control structure stops injecting water into the heating chamber after maintaining the water injection time t2.

6. The method for controlling a steam generator according to claim 1, It is characterized in that The process of monitoring the temperature of the heating structure and controlling the water flow control structure to inject water into the heating chamber according to the temperature until a stop signal is received includes: The temperature monitoring structure monitors the temperature of the heating structure, which is denoted as Tb; The temperature of the heating structure before the monitoring structure at a unit time t3 is retrieved and recorded as Tc; Calculate the temperature change rate within unit time t3 based on Tb, Tc and unit time t3, and record it as v1; According to the temperature change speed v1 of the heating structure, the water flow control structure is controlled to inject water into the heating chamber, thereby maintaining the temperature change speed v1 of the heating structure to meet the temperature change speed threshold range until a stop signal is received; When v1≥the maximum value of the temperature change rate threshold range, the water flow control structure is started to inject water into the heating chamber, and when v1≤the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber.

7. The method for controlling a steam generator according to claim 6, It is characterized in that When v1 ≤ the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber, including: When v1≤the minimum value of the temperature change rate threshold range, the water flow control structure stops injecting water into the heating chamber after maintaining the water injection for t4 time.

8. The method for controlling a steam generator according to claim 1, It is characterized in that After receiving the stop signal, the water flow control structure is controlled to discharge the water in the steam generator out of the steam generator.

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