CN103892693A - Water deficiency detection method, water deficiency detection device and steam cooking utensil - Google Patents
Water deficiency detection method, water deficiency detection device and steam cooking utensil Download PDFInfo
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- CN103892693A CN103892693A CN201410126826.2A CN201410126826A CN103892693A CN 103892693 A CN103892693 A CN 103892693A CN 201410126826 A CN201410126826 A CN 201410126826A CN 103892693 A CN103892693 A CN 103892693A
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Abstract
The invention provides a water deficiency detection method, a water deficiency detection device and a steam cooking utensil. The water deficiency detection method includes: acquiring an interval of disconnection time and connection time of a heating tube mounted in a steam generator; judging whether the interval is larger than a preset threshold or not; if yes, determining that the steam generator is in the state of water deficiency. According to the technical scheme, when the interval of the disconnection time and connection time of the heating tube in the steam generator is larger than the preset threshold, the steam generator being in the state of water deficiency is accurately determined, accuracy in water deficiency detection can be improved, and power resources wasted by cyclic heating of the steam cooking utensil can be avoided.
Description
Technical field
The present invention relates to steam cooking technical field, in particular to a kind of lack of water detection method, a kind of lack of water checkout gear and a kind of steam cooking vessel.
Background technology
In recent years, people more and more pay attention to health diet, and also more and more higher to the requirement of culinary art effect, little by little, people recognize that boiling is well positioned to meet requirement in fact.The huge latent heat of emitting while relying on steam liquefied due to boiling (being Steam Heating) carries out heat treated to food, and advantage is a lot: one, and cooking speed is fast; Its two, due to the easy diffusivity of gas, food is heated also quite even, thus avoided part overheated burn cause nutritive value reduce; They are three years old; owing to having reduced airborne oxygen concentration in steam cooking process; great majority are easily played a very good protection oxidized nutritional labeling; and boiling can also keep the moisture in food to make it be not easy to run off; therefore boiling food out is not only of high nutritive value and mouthfeel is fresh and tender, likable.
At present, the most general Steam Heating food mode of utilizing, is to utilize lower heat-generating disc, directly water heat and produces steam and meet the demand of cooking.But whether lack of water mainly contains following several mode to detect water tank place.
Mode one: the mode that adopts magnetic reed switch float.Adopt this kind of mode, just can float because float itself need to be immersed in the water certain volume, so, sensed water level in this way, water is also remaining a lot of often, the operation of arriving after testing water tank lacks water arrestment, and this situation is particularly evident in the situation that water tank floor space is larger.
Mode two: adopt three metallic plates, judge the mode of water level by detecting the resistance variations of water.By determining within the specific limits the decrease speed of water level, know the lack of water moment by inference, although convert and can estimate the water tank lacks water time by water level decrease speed, but in the case of starting just very low situation (metallic plate only have wherein touch) of water level, just cannot calculate even and cannot detect at all, the wrong report that same existence is larger may.In addition, if the viscosity of water is larger, if form moisture film between two metallic plates, can cause equally reporting lack of water and situation about not detecting.
Mode three: temperature controller is set in steam generator, temperature controller disconnects in the time of 120 DEG C, conducting resets in the time of 90 DEG C, detect in this way water tank lacks water, equipment control circuit does not know that lack of water occurs, even water tank lacks water, still in circulating-heating, only could end loop in the time reaching predetermined cooking time heating, waste electric power resource, and the situation that food does not cook may occur that the heat time finishes time.
Therefore whether lack of water becomes technical problem urgently to be resolved hurrily at present, how to detect accurately water tank.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art or correlation technique.
For this reason, one object of the present invention be to propose a kind of can the heat-generating pipe of steam generator disconnect with connect interval greater than predetermined threshold time, accurately judge the lack of water detection method of steam generator in exsiccosis.
Another object of the present invention is to have proposed a kind of lack of water checkout gear.
Another object of the present invention is to have proposed a kind of steam cooking vessel.
For achieving the above object, embodiment according to a first aspect of the invention, has proposed a kind of lack of water detection method for steam generator, comprising: obtain the time interval between disconnection and the connection that is installed on the heat-generating pipe in described steam generator; Judge whether the described time interval be greater than predetermined threshold, during interval greater than described predetermined threshold, judge that described steam generator is in exsiccosis described.
Lack of water detection method according to an embodiment of the invention, by obtaining the disconnection of heat-generating pipe and the time interval of connection in steam generator, in the time of the state of water yield abundance, in steam generator, heat-generating pipe disconnection will be shorter with the time interval of connecting, this time interval is less than predetermined threshold, judge in the sufficient state of the water yield, and in the time of exsiccosis, the time that steam generator nature chilling temperature reduces will be longer, should be interval greater than predetermined threshold, judge in exsiccosis, whether detect in exsiccosis in this way, simple in structure, level of integrated system is high, and with prior art in by switch float, the detection mode of temperature controller and three metallic plates is compared, detection mode is more accurate, reduce the probability of lack of water wrong report, and cost is lower.
In addition, lack of water detection method according to the above embodiment of the present invention, can also have following additional technical characterictic:
According to one embodiment of present invention, also comprise: the temperature that detects described steam generator; Whether the temperature that judges described steam generator is greater than the first predetermined temperature, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing; After disconnecting the heat-generating pipe of described steam generator, whether the temperature that judges described steam generator is less than the second predetermined temperature, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finish timing; Obtain the time interval between described end timing and described beginning timing, wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
Lack of water detection method according to an embodiment of the invention, in the running of steam generator, in the time of temperature adjustment stage or lack of water, if detect that the temperature of steam generator is higher than the first predetermined temperature, show that steam generator is overheated, now disconnect the heat-generating pipe of steam generator, and start timing, through after certain hour, if detect that the temperature of steam generator is lower than the second predetermined temperature, for ensureing the temperature stabilization of steam generator, avoid steam-generator temperature too low, need to connect the heat-generating pipe of steam generator, now finish timing, if this finish timing with start timing interval greater than predetermined threshold, illustrate that now equipment is in exsiccosis.
According to one embodiment of present invention, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, also comprise: search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
Lack of water detection method according to an embodiment of the invention, by after disconnecting the heat-generating pipe of steam generator, control and supply water to steam generator, preferably, excessive water can be provided, if Water in Water Tanks amount abundance, can provide excessive water to steam generator, the temperature of steam generator will be reduced to the second predetermined temperature (or the second predetermined temperature is following) at short notice, can connect at short notice the heat-generating pipe of steam generator, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be less than predetermined threshold, judge that water tank is in the sufficient state of the water yield, on the contrary, if water tank is in exsiccosis, after disconnecting the heat-generating pipe of steam generator, cannot supply water to steam generator, the temperature of steam generator drops to time of the second predetermined temperature (or second predetermined temperature following) will be long accordingly, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be greater than predetermined threshold, judge that water tank is in exsiccosis.
Certainly, in the time that the time interval and predetermined threshold relatively approach, by provide excessive water after the heat-generating pipe that disconnects steam generator, can make the temperature of steam generator decline rapidly, the heat-generating pipe that reduces steam generator disconnects and the time interval of connecting, thereby improve the resolution ratio that lack of water detects, improve the accuracy that lack of water detects.
According to one embodiment of present invention, described predetermined threshold is relevant to the difference of described the first predetermined temperature and described the second predetermined temperature, and the difference of described the first predetermined temperature and described the second predetermined temperature is larger, and described predetermined threshold is larger.
Lack of water detection method according to an embodiment of the invention, due to after disconnecting the heat-generating pipe of steam generator, the waste heat of the accumulation in steam generator still can make the temperature of steam generator continue to rise, in the time having excessive water to supply with, can drop within a certain period of time the second predetermined temperature, the temperature that therefore difference of the first predetermined temperature and the second predetermined temperature also can affect steam generator is reduced to the time of the second predetermined temperature by the first predetermined temperature.
Specifically, the difference of the first predetermined temperature and the second predetermined temperature is larger, the time that temperature of steam generator is reduced to the second predetermined temperature by the first predetermined temperature is just longer, it is larger that the setting of predetermined threshold also need be set accordingly, and the difference of the first predetermined temperature and the second predetermined temperature is less, the time that temperature of steam generator is reduced to the second predetermined temperature by the first predetermined temperature is just shorter, and it is less that the setting of predetermined threshold also need be set accordingly.
According to one embodiment of present invention, also comprise: in the time judging described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
Lack of water detection method according to an embodiment of the invention, judging steam generator (water tank, water tank supplies water to steam generator) in the time of exsiccosis, prompting steam generator is in exsiccosis, for example: can show by display interface, warning or voice message remind in exsiccosis.In the time judging in exsiccosis, disconnect the heat-generating pipe of steam generator, the electric power resource waste of avoiding on the one hand circulating-heating to cause, the safety problem that can avoid steam generator dry combustion method to cause on the other hand.
Embodiment according to a second aspect of the invention, has proposed a kind of lack of water checkout gear for steam generator, comprising: acquiring unit, for obtain the heat-generating pipe that is installed on described steam generator disconnection and connect between the time interval; Judging unit, judges whether the time interval that described acquiring unit is obtained be greater than predetermined threshold, during interval greater than described predetermined threshold, judges that described steam generator is in exsiccosis described.
Lack of water checkout gear according to an embodiment of the invention, by obtaining the disconnection of heat-generating pipe and the time interval of connection in steam generator, in the time of the state of water yield abundance, in steam generator, heat-generating pipe disconnection will be shorter with the time interval of connecting, this time interval is less than predetermined threshold, judge in the sufficient state of the water yield, and in the time of exsiccosis, the time that steam generator nature chilling temperature reduces will be longer, should be interval greater than predetermined threshold, judge in exsiccosis, whether detect in exsiccosis in this way, simple in structure, level of integrated system is high, and with prior art in by switch float, the detection mode of temperature controller and three metallic plates is compared, detection mode is more accurate, reduce the probability of lack of water wrong report, and cost is lower.
According to one embodiment of present invention, also comprise: detecting unit, detects the temperature of described steam generator; Whether described judging unit is also greater than the first predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing; Whether described judging unit is also less than the second predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finishes timing; Described acquiring unit is specifically for obtaining the time interval between described end timing and described beginning timing, and wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
Lack of water checkout gear according to an embodiment of the invention, in the running of steam generator, in the time of temperature adjustment stage or lack of water, if detect that the temperature of steam generator is higher than the first predetermined temperature, show that steam generator is overheated, now disconnect the heat-generating pipe of steam generator, and start timing, through after certain hour, if detect that the temperature of steam generator is lower than the second predetermined temperature, for ensureing the temperature stabilization of steam generator, avoid steam-generator temperature too low, need to connect the heat-generating pipe of steam generator, now finish timing, if this finish timing with start timing interval greater than predetermined threshold, illustrate that now equipment is in exsiccosis.
According to one embodiment of present invention, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, described judging unit is also in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnect the heat-generating pipe of described steam generator, search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
Lack of water checkout gear according to an embodiment of the invention, by after disconnecting the heat-generating pipe of steam generator, control and supply water to steam generator, preferably, excessive water can be provided, if Water in Water Tanks amount abundance, can provide excessive water to steam generator, the temperature of steam generator will be reduced to the second predetermined temperature (or the second predetermined temperature is following) at short notice, can connect at short notice the heat-generating pipe of steam generator, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be less than predetermined threshold, judge that water tank is in the sufficient state of the water yield, on the contrary, if water tank is in exsiccosis, after disconnecting the heat-generating pipe of steam generator, cannot supply water to steam generator, the temperature of steam generator drops to time of the second predetermined temperature (or second predetermined temperature following) will be long accordingly, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be greater than predetermined threshold, judge that water tank is in exsiccosis.
Certainly, in the time that the time interval and predetermined threshold relatively approach, by provide excessive water after the heat-generating pipe that disconnects steam generator, can make the temperature of steam generator decline rapidly, the heat-generating pipe that reduces steam generator disconnects and the time interval of connecting, thereby improve the resolution ratio that lack of water detects, improve the accuracy that lack of water detects.
According to one embodiment of present invention, also comprise: Tip element, in the time that described judging unit is judged described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
Lack of water checkout gear according to an embodiment of the invention, judging steam generator (water tank, water tank supplies water to steam generator) in the time of exsiccosis, prompting steam generator is in exsiccosis, for example: can show by display interface, warning or voice message remind in exsiccosis.In the time judging in exsiccosis, disconnect the heat-generating pipe of steam generator, the electric power resource waste of avoiding on the one hand circulating-heating to cause, the safety problem that can avoid steam generator dry combustion method to cause on the other hand.
Embodiment according to a third aspect of the invention we, has proposed a kind of steam cooking vessel, it is characterized in that, comprising: the lack of water checkout gear in above-described embodiment described in any one.
Steam cooking vessel according to an embodiment of the invention, by add lack of water checkout gear in steam cooking vessel, make to judge accurately that whether steam cooking vessel is in exsiccosis, the electric power resource waste of avoiding circulating-heating to cause avoids interference the safety problem causing simultaneously.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 shows the schematic flow diagram of lack of water detection method according to an embodiment of the invention;
Fig. 2 shows the schematic flow diagram of lack of water detection method according to another embodiment of the present invention;
Fig. 3 shows the structural representation of lack of water checkout gear according to an embodiment of the invention;
Fig. 4 shows the profile of steam cooking vessel according to an embodiment of the invention.
Detailed description of the invention
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 1 shows the schematic flow diagram of lack of water detection method according to an embodiment of the invention.
As shown in Figure 1, lack of water detection method according to an embodiment of the invention, comprising: step 102, obtain the time interval between disconnection and the connection that is installed on the heat-generating pipe in described steam generator; Step 104, judges whether the described time interval be greater than predetermined threshold, during interval greater than described predetermined threshold, judges that described steam generator is in exsiccosis described.
By obtaining the disconnection of heat-generating pipe and the time interval of connection in steam generator, in the time of the state of water yield abundance, in steam generator, heat-generating pipe disconnection will be shorter with the time interval of connecting, this time interval is less than predetermined threshold, judge in the sufficient state of the water yield, and in the time of exsiccosis, the time that steam generator nature chilling temperature reduces will be longer, should be interval greater than predetermined threshold, judge in exsiccosis, whether detect in exsiccosis in this way, simple in structure, level of integrated system is high, and with prior art in by switch float, the detection mode of temperature controller and three metallic plates is compared, detection mode is more accurate, reduce the probability of lack of water wrong report, and cost is lower.
In addition, lack of water detection method according to the above embodiment of the present invention, can also have following additional technical characterictic:
According to one embodiment of present invention, also comprise: the temperature that detects described steam generator; Whether the temperature that judges described steam generator is greater than the first predetermined temperature, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing; After disconnecting the heat-generating pipe of described steam generator, whether the temperature that judges described steam generator is less than the second predetermined temperature, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finish timing; Obtain the time interval between described end timing and described beginning timing, wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
In the running of steam generator, in the time of temperature adjustment stage or lack of water, if detect that the temperature of steam generator is higher than the first predetermined temperature, show that steam generator is overheated, now disconnect the heat-generating pipe of steam generator, and start timing, through after certain hour, if detect that the temperature of steam generator is lower than the second predetermined temperature, for ensureing the temperature stabilization of steam generator, avoid steam-generator temperature too low, need to connect the heat-generating pipe of steam generator, now finish timing, if this finish timing with start timing interval greater than predetermined threshold, illustrate that now equipment is in exsiccosis.
According to one embodiment of present invention, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, also comprise: search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
By after disconnecting the heat-generating pipe of steam generator, control and supply water to steam generator, preferably, excessive water can be provided, if Water in Water Tanks amount abundance, can provide excessive water to steam generator, the temperature of steam generator will be reduced to the second predetermined temperature (or the second predetermined temperature is following) at short notice, can connect at short notice the heat-generating pipe of steam generator, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be less than predetermined threshold, judge that water tank is in the sufficient state of the water yield; On the contrary, if water tank is in exsiccosis, after disconnecting the heat-generating pipe of steam generator, cannot supply water to steam generator, the temperature of steam generator drops to time of the second predetermined temperature (or second predetermined temperature following) will be long accordingly, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be greater than predetermined threshold, judge that water tank is in exsiccosis.
Certainly, in the time that the time interval and predetermined threshold relatively approach, by provide excessive water after the heat-generating pipe that disconnects steam generator, can make the temperature of steam generator decline rapidly, the heat-generating pipe that reduces steam generator disconnects and the time interval of connecting, thereby improve the resolution ratio that lack of water detects, improve the accuracy that lack of water detects.
According to one embodiment of present invention, described predetermined threshold is relevant to the difference of described the first predetermined temperature and described the second predetermined temperature, and the difference of described the first predetermined temperature and described the second predetermined temperature is larger, and described predetermined threshold is larger.
Due to after disconnecting the heat-generating pipe of steam generator, the waste heat of the accumulation in steam generator still can make the temperature of steam generator continue to rise, in the time having excessive water to supply with, can drop within a certain period of time the second predetermined temperature, the temperature that therefore difference of the first predetermined temperature and the second predetermined temperature also can affect steam generator is reduced to the time of the second predetermined temperature by the first predetermined temperature.
Specifically, the difference of the first predetermined temperature and the second predetermined temperature is larger, the time that temperature of steam generator is reduced to the second predetermined temperature by the first predetermined temperature is just longer, it is larger that the setting of predetermined threshold also need be set accordingly, and the difference of the first predetermined temperature and the second predetermined temperature is less, the time that temperature of steam generator is reduced to the second predetermined temperature by the first predetermined temperature is just shorter, and it is less that the setting of predetermined threshold also need be set accordingly.
According to one embodiment of present invention, also comprise: in the time judging described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
Judging that steam generator (water tank, water tank supplies water to steam generator) is during in exsiccosis, prompting steam generator is in exsiccosis, for example: can show by display interface, warning or voice message remind in exsiccosis.In the time judging in exsiccosis, disconnect the heat-generating pipe of steam generator, the electric power resource waste of avoiding on the one hand circulating-heating to cause, the safety problem that can avoid steam generator dry combustion method to cause on the other hand.
Fig. 2 show according to another embodiment of the present invention schematic flow diagram.
As shown in Figure 2, lack of water detection method according to another embodiment of the present invention, idiographic flow comprises:
Step 214, in the time that the temperature of steam generator reaches the second predetermined temperature, connects heat-generating pipe, finishes timing, and obtains the heat-generating pipe disconnection of steam generator and the time interval of connecting.
Fig. 3 shows the structural representation of lack of water checkout gear according to an embodiment of the invention.
As shown in Figure 3, lack of water checkout gear 300 according to an embodiment of the invention, comprising: acquiring unit 302, for obtain the heat-generating pipe that is installed on described steam generator disconnection and connect between the time interval; Judging unit 304, judges whether the time interval that described acquiring unit 302 is obtained be greater than predetermined threshold, during interval greater than described predetermined threshold, judges that described steam generator is in exsiccosis described.
By obtaining the disconnection of heat-generating pipe and the time interval of connection in steam generator, in the time of the state of water yield abundance, in steam generator, heat-generating pipe disconnection will be shorter with the time interval of connecting, this time interval is less than predetermined threshold, judge in the sufficient state of the water yield, and in the time of exsiccosis, the time that steam generator nature chilling temperature reduces will be longer, should be interval greater than predetermined threshold, judge in exsiccosis, whether detect in exsiccosis in this way, simple in structure, level of integrated system is high, and with prior art in by switch float, the detection mode of temperature controller and three metallic plates is compared, detection mode is more accurate, reduce the probability of lack of water wrong report, and cost is lower.
According to one embodiment of present invention, also comprise: detecting unit 306, detects the temperature of described steam generator; Whether described judging unit 304 is also greater than the first predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing; Whether described judging unit 304 is also less than the second predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finishes timing; Described acquiring unit 302 is specifically for obtaining the time interval between described end timing and described beginning timing, and wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
In the running of steam generator, in the time of temperature adjustment stage or lack of water, if detect that the temperature of steam generator is higher than the first predetermined temperature, show that steam generator is overheated, now disconnect the heat-generating pipe of steam generator, and start timing, through after certain hour, if detect that the temperature of steam generator is lower than the second predetermined temperature, for ensureing the temperature stabilization of steam generator, avoid steam-generator temperature too low, need to connect the heat-generating pipe of steam generator, now finish timing, if this finish timing with start timing interval greater than predetermined threshold, illustrate that now equipment is in exsiccosis.
According to one embodiment of present invention, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, described judging unit 304 is also in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnect the heat-generating pipe of described steam generator, search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
By after disconnecting the heat-generating pipe of steam generator, control and supply water to steam generator, preferably, excessive water can be provided, if Water in Water Tanks amount abundance, can provide excessive water to steam generator, the temperature of steam generator will be reduced to the second predetermined temperature (or the second predetermined temperature is following) at short notice, can connect at short notice the heat-generating pipe of steam generator, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be less than predetermined threshold, judge that water tank is in the sufficient state of the water yield; On the contrary, if water tank is in exsiccosis, after disconnecting the heat-generating pipe of steam generator, cannot supply water to steam generator, the temperature of steam generator drops to time of the second predetermined temperature (or second predetermined temperature following) will be long accordingly, the now heat-generating pipe of steam generator disconnection and the time interval of connecting must be greater than predetermined threshold, judge that water tank is in exsiccosis.
Certainly, in the time that the time interval and predetermined threshold relatively approach, by provide excessive water after the heat-generating pipe that disconnects steam generator, can make the temperature of steam generator decline rapidly, the heat-generating pipe that reduces steam generator disconnects and the time interval of connecting, thereby improve the resolution ratio that lack of water detects, improve the accuracy that lack of water detects.
According to one embodiment of present invention, also comprise: Tip element 308, in the time that described judging unit is judged described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
Judging that steam generator (water tank, water tank supplies water to steam generator) is during in exsiccosis, prompting steam generator is in exsiccosis, for example: can show by display interface, warning or voice message remind in exsiccosis.In the time judging in exsiccosis, disconnect the heat-generating pipe of steam generator, the electric power resource waste of avoiding on the one hand circulating-heating to cause, the safety problem that can avoid steam generator dry combustion method to cause on the other hand.
Fig. 4 shows the profile of steam cooking vessel according to an embodiment of the invention.
As shown in Figure 4, according to embodiments of the invention steam cooking vessel 400, comprising: the lack of water checkout gear 300 in above-described embodiment described in any one.
By add lack of water checkout gear 300 in steam cooking vessel 400, make to judge accurately that whether steam cooking vessel 400 is in exsiccosis, the electric power resource waste of avoiding circulating-heating to cause avoids interference the safety problem causing simultaneously.
Specifically: steam cooking vessel 400 according to an embodiment of the invention, comprise: culinary art cavity 402(cavity outer cladding one deck heat-insulating heat-preserving material 418), for utilize by steam (vapor) outlet 404 be delivered to culinary art cavity 402 steam to put into culinary art cavity 402 food heat, steam (vapor) outlet 404 operated by rotary motion are in middle and lower part one side of culinary art cavity 402, steam (vapor) outlet 404 connects the steam generator 406 that can carry out heat accumulation and produce steam, on steam generator 406, be provided with temperature sensor 408, to detect steam generator 406 temperature, and the temperature of steam generator 406 is sent to control module 410.Control module 410 adopts the form of water pump according to the temperature of steam generator 406 to water supply pump 412(control valve) and the heat-generating pipe 414 of steam generator 406 control, to control the temperature of steam generator 406.
Wherein, water supply pump 412(direct current, exchange all can) water supply capacity must be greater than the maximum amount of water that steam generator 406 can digest, as shown in table 1, be connected between steam generator 406 and water tank 416, for steam generator 406 supplies water.
Table 1
In general, the occurring mode of steam is by the heat-generating pipe 414 heating steam generators 406 of steam generator 406 cavity that is filled with water, allow water chamber temperature rise, drive again water pump 412 condemn into water to explosive evaporation produce steam, steam is can be in steam generator 406 water chambers remaining mobile overheated in without water cavity, finally enters culinary art cavity 402 by steam (vapor) outlet 404 ejections of steam generator 406 food is heated.
The mode supplying water when water pump 412 is the batch (-type) water supply pattern that adopts certain ON time, and this process can further be carried out refinement.For example, adopt the steam generator 406 of 900W, can allow the water of 20.8ml in 1 minute, all become the steam of 100 DEG C.So, as long as the water of being no more than 20.8ml in one minute steam generator 406 supplies just can allow steam generator 406 in normal operating conditions.And after output reduces, steam generator 406 can enter superheat state, that is to say, unnecessary heat energy can be converted into the temperature of steam generator 406 bodies, makes the temperature rise of steam generator 406 and puts aside.
As one comparatively preferred embodiment, steam generator 406 of the present invention generally has the runner design of gas superheat, make in the case of heat-generating pipe 414 power supply circuits without disconnection steam generator 406, as long as when output is suitable, the temperature of steam generator 406 just can be stabilized in (being generally to exceed 100 DEG C) in the temperature setting for a long time.
So-called suitable output, as shown in table 2:
Table 2
As shown in table 2, the steam generator 406 of same 900W, output differs only 1ml, the theoretical limit temperature difference of steam generator 406 only 60 DEG C, so, by temperature sensor 408, the temperature of steam generator 406 being sent to control module 410, just can accurately control supplying water.
When steam cooking vessel 400 brings into operation, owing to there being the pipeline supplying water in whole system, in supply channel, may there is water, also may be anhydrous, in the process of steam generator 406 temperature rises, for example, in the time that reaching the first predetermined temperature (: 100 DEG C), the temperature of steam generator 406 just starts to supply water in supply channel, if while avoiding just supplying water in the time arriving target equilibrium temperature, because supplying water not in time, cause steam generator 406 temperature upper punches too urgent and exceeded the problem of safe handling temperature.
When reaching, steam generator 406 needs the accurately temperature section of control water, for example: 150 DEG C～170 DEG C, start to supply water with the way of supplying water of fine setting ON time.Detailed process is: in the time that the temperature of steam generator 406 reaches 150 DEG C, if the water supply deviation of water pump 412 own is 20 ± 5ml/min, so, the output that control module 410 is controlled water pump 412 correspondences is 15ml/min, no matter water pump 412 water supply capacities own are limit on the upper side or limit on the lower side, and the temperature of steam generator 406 all still can continue to rise; And in the time that the temperature of steam generator 406 exceedes 170 DEG C, the output that control module 410 is controlled water pump 412 correspondences is 25ml/min, no matter water pump 412 water supply capacities own are limit on the upper side or limit on the lower side, and the temperature of steam generator 406 all can decline, only the situation of lack of water.
And because the vaporization of water can absorb a large amount of latent heat, the cooling that causes steam generator 406 is flashy thing, conceivable, 1 gram of water vapor will consume 406 produce powers of 3 seconds steam heating devices and just be short to Microsecond grade and just can complete.
Like this, in the situation that having abundant water resources, described steam generator 406 body temperatures just can fluctuate in the scope of 160 ± 10 DEG C, meanwhile, provide to the water yield of steam generator 406 and also fluctuate because this adjusting is limited in a quite little scope.In optimal situation, the fluctuation of output can be 20ml ± 0.2ml/min.Certainly, in actual use procedure, due to the deviation of heat-generating pipe 414 power of the manufacture craft of steam generator 406 itself, steam generator 406, and the temperature measurement error of temperature sensor 408 own, the fluctuation range that can control can be relatively wider, the scope of generally can not exceed ± 1ml/min.
On the basis of above-mentioned steam generating system, the output of the steam generator 406 of having set temperature is divided to variation.For example, if in the time that culinary art cavity 402 Temperature Settings are 100 DEG C, the output that is set in 406160 DEG C of steam generators is 6.4ml/min, so, if when the temperature detecting at the temperature sensor 420 of culinary art cavity 402 is 90 DEG C, the output of 406160 DEG C of steam generators is set as to 3.2ml/min, because the power of steam generator 406 heat-generating pipes 414 is constant, cause the required time of steam generator 406 temperature rises and decline same degree also to reduce half, the power that is steam generator 406 can automatically adapt to the variation of output and change the energy of sending in culinary art cavity 402.
According to above-mentioned principle, if realize precision regulating temperature function, such as 90 DEG C, while starting working, can carry out work in the mode of peak power makes to cook cavity 402 central temperatures and reaches 85 DEG C, then switch to 100 DEG C of gears (output that generator is 160 DEG C set 6.4ml/min) and allow the temperature of culinary art cavity 402 still draw close to 90 DEG C, when the central temperature of culinary art cavity 402 arrives 90 DEG C, generator switches to 90 DEG C of gears (output that generator is 160 DEG C is set 3.2ml/min).Because this setting is to test according to culinary art cavity 402 output of quite pressing close to 90 DEG C of energy requirements obtaining, so, the central temperature of culinary art cavity 402 only there will be fuctuation within a narrow range (according to actual energy surplus or loss, temperature can rise and can fall), but, when once temperature exceedes 95 DEG C, generator switches to 80 DEG C of gears (output that generator is 160 DEG C is set 2.4ml/min), allow the energy of sending in culinary art cavity 402 cannot maintain again the high temperature of 95 DEG C, the temperature of culinary art cavity 402 declines naturally, by that analogy, reciprocation cycle, just can reach the object of accurate temperature controlling.
Certainly, above-mentioned description is all amplified all settings, so that understand.In fact, the temperature of switching different gears can be defined in 1 DEG C of left and right completely, thereby reaches the control effect that is accurate to 1 DEG C.But, this is just for same temperature sensor, when the temperature sensor that has changed other and there are different tolerances, because of the inaccuracy of himself thermometric, so and culinary art cavity 402 actual temperatures always have some errors (being generally 3～5 DEG C).
For example: for the culinary art cavity 402 of 24L left and right, 160 DEG C of output patterns of steam generator are as shown in table 3:
Table 3
It should be noted that, no matter steam cooking vessel 400 is Operation at full powers or in the temperature adjustment stage, all can be sent to the operation that the temperature information of control module 410 disconnects or recloses the heat-generating pipe 414 in steam generator 406 according to temperature sensor 408 in steam generator 406.
The groundwork principle of the lack of water checkout gear of embodiments of the invention is: after the heat-generating pipe 414 of steam generator 406 disconnects, temperature sensor 408 detects that the temperature of steam generator 406 continues to rise, when the temperature of steam generator 406 reaches specified temp, water pump 412 can be supplied excessive water (be generally 160 DEG C of outputs 1.25～5 times) to steam generator 406, the temperature of steam generator 406 is declined rapidly, ensure its maintain heat-generating pipe 414 be disconnected to reclose enough short during this period of time, to can clearly judge that steam generator 406 is in having water or the state of lack of water supply.
Specifically, continue to have in water yield abundance under the state of water supply, heat-generating pipe 414 disconnects (break-off signal, such as 195 DEG C) after, the steam generator 406 therefore heat energy temperature of front accumulation continues to rise, but supplement coolingly from the cold water of water tank 416 because constantly having, make it drop to time that heat-generating pipe 414 recloses temperature (such as 175 DEG C) and become suitable short.In worst situation, only have in the situation of 0.3 gram/minute as cooked the output of 40240 DEG C of gears of cavity in table 3, because output arrives less almost with not similar, in this case, as long as there are some heat fluctuations in steam generator 406 in temperature rise process, make its temperature reach higher point, and fall off rate changes in little situation, just likely occur the situation (because the time span that this grade detects and lack of water judge that the time is too approaching) of lack of water wrong report.At this time, when being controlled at steam generator 406 temperature and reaching specified level, supply with excessive water and just played strong resolution effect.
Obviously, for 40240 DEG C of above gears of culinary art cavity, because the setting output of 160 DEG C is increasing, being disconnected to from heat-generating pipe 414 time cycle reclosing only can be shorter and shorter, thermal fluctuation is also more and more less on the impact of steam generator 406 temperature fluctuations, and lack of water testing result just more can be guaranteed.
In general, temperature difference and the generator material weight of the first predetermined temperature when predetermined threshold can be according to the disconnection of heat-generating pipe 414 and the second predetermined temperature while connecting, actual setting can be as shown in table 4:
Table 4
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, the heat-generating pipe of steam generator disconnect with connect interval greater than predetermined threshold time, accurately judge that steam generator is in exsiccosis, can improve the accuracy that steam cooking vessel lack of water detects, avoid on the one hand steam cooking vessel circulating-heating waste electric power resource, on the other hand, the safety problem of avoiding dry combustion method to cause.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. for a lack of water detection method for steam generator, it is characterized in that, comprising:
Obtain the time interval between disconnection and the connection that is installed on the heat-generating pipe in described steam generator;
Judge whether the described time interval be greater than predetermined threshold, during interval greater than described predetermined threshold, judge that described steam generator is in exsiccosis described.
2. lack of water detection method according to claim 1, is characterized in that, also comprises:
Detect the temperature of described steam generator;
Whether the temperature that judges described steam generator is greater than the first predetermined temperature, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing;
After disconnecting the heat-generating pipe of described steam generator, whether the temperature that judges described steam generator is less than the second predetermined temperature, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finish timing;
Obtain the time interval between described end timing and described beginning timing,
Wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
3. lack of water detection method according to claim 2, it is characterized in that, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, also comprise: search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
4. lack of water detection method according to claim 1, it is characterized in that, described predetermined threshold is relevant to the difference of described the first predetermined temperature and described the second predetermined temperature, and the difference of described the first predetermined temperature and described the second predetermined temperature is larger, and described predetermined threshold is larger.
5. lack of water detection method according to claim 1, is characterized in that, also comprises: in the time judging described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
6. for a lack of water checkout gear for steam generator, it is characterized in that, comprising:
Acquiring unit, for obtain the heat-generating pipe that is installed on described steam generator disconnection and connect between the time interval;
Judging unit, judges whether the time interval that described acquiring unit is obtained be greater than predetermined threshold, during interval greater than described predetermined threshold, judges that described steam generator is in exsiccosis described.
7. lack of water detection method according to claim 6, is characterized in that, also comprises:
Detecting unit, detects the temperature of described steam generator;
Whether described judging unit is also greater than the first predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnects the heat-generating pipe of described steam generator, and starts timing;
Whether described judging unit is also less than the second predetermined temperature for the temperature that judges described steam generator, in the time that the temperature of described steam generator is less than described the second predetermined temperature, connects the heat-generating pipe of described steam generator, and finishes timing;
Described acquiring unit is specifically for obtaining the time interval between described end timing and described beginning timing,
Wherein, described the first predetermined temperature is greater than described the second predetermined temperature.
8. lack of water detection method according to claim 7, it is characterized in that, before whether the described temperature that judges described steam generator is less than the second predetermined temperature, described judging unit is also in the time that the temperature of described steam generator is greater than described the first predetermined temperature, disconnect the heat-generating pipe of described steam generator, search described output relation table to obtain the output corresponding with described steam-generator temperature, supply water to described steam generator with described output, wherein, in described output relation table, store the temperature of described steam generator and the output corresponding with described steam-generator temperature.
9. lack of water detection method according to claim 6, it is characterized in that, also comprise: Tip element, in the time that described judging unit is judged described steam generator in exsiccosis, point out described steam generator in exsiccosis, and disconnect the heat-generating pipe of described steam generator.
10. a steam cooking vessel, is characterized in that, comprising: the lack of water checkout gear as described in any one in claim 6 to 9.
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