CN108392090A - Steam generator and steam cooking apparatus - Google Patents
Steam generator and steam cooking apparatus Download PDFInfo
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- CN108392090A CN108392090A CN201810517205.5A CN201810517205A CN108392090A CN 108392090 A CN108392090 A CN 108392090A CN 201810517205 A CN201810517205 A CN 201810517205A CN 108392090 A CN108392090 A CN 108392090A
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- 238000010411 cooking Methods 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 329
- 238000010438 heat treatment Methods 0.000 claims abstract description 87
- 238000005086 pumping Methods 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 23
- 239000007788 liquid Substances 0.000 claims description 94
- 238000001914 filtration Methods 0.000 claims description 45
- 238000009833 condensation Methods 0.000 claims description 30
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- 238000004886 process control Methods 0.000 claims description 11
- 238000000926 separation method Methods 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 4
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- 239000011229 interlayer Substances 0.000 claims description 2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
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- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
- A47J36/2483—Warming devices with electrical heating means
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
- A47J2027/043—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels for cooking food in steam
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cookers (AREA)
Abstract
The invention discloses a kind of steam generator and steam cooking apparatus, the steam generator includes：Steam boiler (1), water route component (2) and cell controller.Wherein, the steam boiler (1) includes boiler heating element (17)；The water route component (2) includes the water pump (21) that fluid or pumping fluid are pumped to the steam boiler (1)；The cell controller is used to control the pump power of the boiler heating power and the water pump (21) of the steam boiler (1).The steam generation facility of the present invention is integrated with the water route component with water pump and controls the cell controller of pump power and heating power, so that the steam generator has integrated modularization effect, and relevant parameter is accurately controlled by the cell controller that module carries, to realize the effect of the Rapid steam output of the steam generator, and the modular structure is more conducive to promote the product miniaturization of steam generator and unitized effect.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a steam generator and a steam cooking device.
Background
In the existing household steam cooking device, a steam generator is generally a common steam boiler for heating cooking water to generate steam, and the steam generator is mainly divided into two ways of being internally or externally arranged in a cooking cavity. Wherein, built-in type steam generator sets up at the culinary art chamber diapire usually and directly heats boiling water in order to produce steam, and external type steam generator sets up at the cavity outer wall usually to steam that will produce passes through steam guide pipe etc. and lets in the culinary art intracavity constantly with cooking food.
In current household steam cooking devices, such as steam ovens and the like, the time period during which steam is generated in the cooking cavity is long, so that the waiting time for cooking food is also relatively long. There are two main categories according to the steam generation principle: one is a water storage type, in which water is directly introduced into a steam boiler and gradually boiled to generate steam, which usually takes about 1 minute; in another type, the heating element of the steam boiler is a casting, and the casting is usually heated to a certain temperature of 100 ℃ or above, and then water is sprayed to the casting to generate steam, which generally takes about 30 seconds, so that the waiting time for cooking is long.
Simultaneously because culinary art cavity inner chamber and outer wall are cold environment for temperature is lower in the cavity, thereby it is long when also having increased the culinary art, in addition, steam when meetting the lower culinary art cavity outer wall of temperature, forms the water droplet very easily and directly drips on the food that needs the culinary art, makes the culinary art effect not good, finally makes user's experience feel not good.
Disclosure of Invention
The invention aims to provide a small and modular steam generator capable of rapidly discharging steam.
In order to achieve the above object, the present invention provides a steam generator including:
a steam boiler comprising a boiler heating element;
a waterway assembly including a water pump pumping fluid or pumping fluid to the steam boiler; and
and the unit controller is used for controlling the boiler heating power of the steam boiler and the pumping power of the water pump.
Preferably, the steam generator comprises a box body, and the steam boiler, the waterway assembly and the unit controller are all arranged in a box cavity of the box body.
Preferably, the box body is a rectangular box, the unit controller and the waterway assembly are arranged in an up-down stacked manner, and the steam boiler, the unit controller and the waterway assembly which are arranged in an up-down stacked manner are arranged along the length direction of the box cavity.
Preferably, the box body has a length not greater than 250mm, a width not greater than 100mm and a height not greater than 100 mm.
Preferably, the steam generator comprises a circuit board assembly electrically connected with the boiler heating element, in which a thyristor unit for controlling the boiler heating power of the boiler heating element is integrated.
Preferably, the water path assembly comprises a water path plate, the water pump comprises a water inlet pump and a water suction pump, and the water inlet pump and the water suction pump are connected to the water path plate in an inserted mode and pump fluid or pump fluid to the steam boiler through the water path plate.
Preferably, contact heat conduction is formed between the silicon controlled rectifier unit and the water circuit board.
Preferably, the water circuit board is provided with a combined water receiving port, an external water inlet and an external water outlet, an in-board water inlet waterway is connected between the combined water receiving port and the external water inlet, a water inlet pump serial inlet and a water inlet pump serial outlet are arranged in the in-board water inlet waterway, an in-board water pumping waterway is connected between the combined water receiving port and the external water outlet, and a water pump serial inlet and a water pump serial outlet are arranged in the in-board water pumping waterway;
wherein, the water route board passes through and be connected to with the water receiving mouth steam boiler, the water inlet and the delivery port of intake pump dock respectively the intake pump concatenates the entry and the intake pump concatenates the export, the water inlet and the delivery port of suction pump dock respectively the suction pump concatenates the entry and the suction pump concatenates the export.
Preferably, the waterway assembly comprises a detachable joint cover which is detachably sleeved outside the external water inlet and the external water outlet and is provided with an external water inlet communicated with the external water inlet and an external water outlet respectively.
Preferably, the water route board is the rectangular plate, follows on the first length direction of water route board, external water inlet, external outlet and with the water receiving mouth arrange in proper order at interval on the board limit wall on same long limit of water route board, the first face wall of water route board is provided with in proper order at interval the intake pump concatenates the export, the intake pump concatenates the entry, the suction pump concatenates the export and the suction pump concatenates the entry.
Preferably, the boiler heating element is a thick film.
Preferably, steam boiler includes the boiler body, boiler heating element sets up on the diapire of boiler body, be equipped with the separation layer spare in the boiler chamber in the boiler body in order to form water filtering cavity, the steam filtering cavity and the condensation chamber of gas pocket intercommunication in proper order above the liquid level, the top in condensation chamber is connected with steam outlet pipe.
Preferably, the partition comprises a water filtering plate, the water filtering plate is a hole grid plate uniformly distributed with filter holes, the water filtering plate is arranged above the liquid level at intervals, and the filter cavity is formed between the water filtering plate and the liquid level;
the interlayer piece further comprises a condensation cover which is covered and buckled above the water filter plate, the steam filtering cavity is formed between the condensation cover and the water filter plate, and the top wall of the condensation cover is provided with a plurality of air outlet holes.
Preferably, the condensation cavity is formed between the condensation cover and the top wall of the boiler body, a backflow step portion is formed at the edge of the top wall of the condensation cover, a backflow edge gap is formed on the water filter plate, and condensed water on the top wall of the boiler body can sequentially flow through the backflow step portion and the backflow edge gap to flow back to the bottom of the boiler cavity.
Preferably, the unit controller comprises a flow process control module configured to: when the steam generator starts to work, starting the steam boiler to heat at a preset heating power Wconstant power, and simultaneously starting the water pump to supply liquid to the steam boiler at an initial liquid inlet flow rate X1; wherein, X1 is X0X Y, Y is a multiple constant not greater than 3 and not less than 1.5, and X0 is the current theoretical evaporation flow corresponding to the predetermined heating power W.
Preferably, the following are satisfied:
wherein C1 is the specific heat capacity of the liquid, T0 is the initial liquid temperature, T1 is the boiling point temperature of the liquid, and C2 is the vaporization thermal parameter of the liquid.
Preferably, the unit controller further comprises a heating frequency control module configured to: obtaining the preset heating power W according to the set second steam outlet time length T and the multiple value constant Y, wherein the preset heating power W is presetThe heating power W satisfies: w is greater than or equal to X1*T*Q1+Q3*m1；
Wherein,Q1＝C1*(T1-T0)，Q3＝C3*(T1-T0)
c1 is the specific heat capacity of liquid, C2 is the gasification heat parameter of liquid, C3 is the specific heat capacity of the material of the surrounding wall of the furnace of the steam boiler, T0 is the initial liquid temperature, T1 is the boiling temperature of liquid, m1 is the mass of the surrounding wall of the furnace, Q1 is the heat absorbed in the process that the unit mass of liquid rises from T0 to T1 in unit time, and Q3 is the heat absorbed in the process that the unit mass of the surrounding wall of the furnace rises from T0 to T1 in unit time.
Preferably, the second steam-out time period T is not more than 3 seconds.
Preferably, a liquid level detector is arranged in the steam boiler, and the flow process control module is further configured to: and in the process of continuously heating and discharging steam from the steam generator, controlling the water pump to enable the boiler liquid level in the steam boiler to be between the dry burning prevention liquid level and the excessive liquid level.
Preferably, the flow process control module is further configured to:
when the initial boiler liquid level in the steam boiler reaches a preset control liquid level, regulating the liquid inlet flow from the initial liquid inlet flow X1 to the current power theoretical evaporation flow X0; and
continuously detecting the liquid level of the boiler, and when the liquid level of the boiler is higher than the preset control liquid level within continuous overproof detection time T', reducing the liquid inlet flow and adjusting the liquid inlet flow to be reduced liquid inlet flow X3;
or when the liquid level of the boiler is lower than the preset control liquid level within the continuous overproof detection time T', increasing the liquid inlet flow and adjusting the liquid inlet flow to be incremental liquid inlet flow X4;
wherein, the preset control liquid level is between the dry burning prevention liquid level and the excessive liquid level.
Preferably, the decrement feed liquid flow rate X3 is half of the current power theoretical evaporation flow rate X0, and the increment feed liquid flow rate X4 is twice the current power theoretical evaporation flow rate X0.
Preferably, the superscalar detection time T' is inversely proportional to the multiple-valued constant Y.
Preferably, the flow process control module is further configured to: and when the steam generator stops working, controlling the water pump to pump liquid to empty the fluid in the steam boiler.
In addition, the invention also provides a steam cooking device which comprises a cooking cavity and the steam generator, wherein the steam generator introduces steam into the cooking cavity.
Preferably, the steam cooking device further comprises a preheating heating element arranged around the outer wall of the cooking cavity and a complete machine controller in communication with the unit controller, the complete machine controller being configured to:
and when the steam boiler is controlled and heated by the unit controller, the preheating heating element is synchronously started to preheat the cooking cavity.
Preferably, the preheating heating power of the preheating heating element is the maximum heating power of the steam cooking device minus the boiler power and the pumping power.
Preferably, the preheating heating element comprises a top wall preheating element for heating a top wall of the cooking cavity, a rear wall preheating element for heating a rear wall of the cooking cavity and a bottom wall preheating element for heating a bottom wall of the cooking cavity, the machine controller being further configured to: the top wall preheating element, the rear wall preheating element and the bottom wall preheating element are sequentially activated.
Preferably, the preheating heating element is spaced from an outer wall surface of the cooking cavity.
Through the technical scheme, the steam generating device is integrated with the water path assembly with the water pump and the unit controller for controlling the pumping power and the heating power, so that the steam generator has an integrated modular effect, related parameters are accurately controlled through the unit controller with the module, the effect of quickly discharging steam of the steam generator is achieved, and the modular structure is more favorable for improving the purposes of product miniaturization and generalization of the steam generator.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a perspective view of a steam generator according to a preferred embodiment of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a top view of FIG. 1;
FIG. 4 is a cross-sectional view of section A-A of FIG. 2;
FIG. 5 is a cross-sectional view of section B-B of FIG. 3;
FIG. 6 is an exploded view of FIG. 1;
FIG. 7 is a schematic view of the structure of the water filter plate;
FIG. 8 is a schematic structural view of a condensation cover;
FIG. 9 is a cross-sectional view of section C-C of FIG. 2;
FIG. 10 is a cross-sectional view taken along section D-D of FIG. 2;
FIG. 11 is a perspective view of a waterway assembly in accordance with a preferred embodiment of the present invention;
fig. 12 and 13 are perspective views of a waterway plate assembly in accordance with a preferred embodiment of the present invention;
fig. 14 and 15 are exploded views of the waterway plate assembly;
FIG. 16 is a front view of the waterway plate assembly;
FIG. 17 is a cross-sectional view of section E-E of FIG. 16;
fig. 18 is a perspective view of a steam cooking device according to a preferred embodiment of the present invention;
fig. 19 is a front view of a steam cooking apparatus (inner structure) according to a preferred embodiment of the present invention;
FIG. 20 is a cross-sectional view of section F-F of FIG. 19; and
fig. 21 is a schematic diagram of the structure of the cell controller.
Description of the reference numerals
1 steam boiler 2 waterway assembly
3 circuit board assembly 4 box body
5 isolation box
10 boiler body 11 water filtering cavity
12 steam filtering cavity and 13 condensation cavity
14 water filtering plate 15 condensation cover
16 steam outlet pipe 17 boiler heating element
21 water pump 22 water channel plate
23 dismounting joint cover 24 waterway groove
25 heat-conducting plate 26 annular seal
31 silicon controlled rectifier unit
151 air outlet hole convex plate 152 air outlet hole
153 reflow step portion
141 filter cell 142 return edge gap
211 water inlet pump 212 water pump
221 boiler water receiving port 222 is externally connected with a water inlet
223 external water outlet 224 mounting boss
211a inlet pump serial outlet 211b inlet pump serial inlet
212a suction pump series inlet 212b suction pump series outlet
230 external water gap M first plate surface wall
241 first waterway groove 242 and second waterway groove
243 third water channel N second plate surface wall
800 bottom heating element for cooking cavity 603
601 top wall preheating element 602 rear wall preheating element
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
In view of the problems of the conventional steam cooking device that the steam generator only comprises a steam boiler for generating steam and the external connection of the steam boiler is usually provided with a water inlet pipe, a water inlet pump and other components, so that the conventional steam generator has the problems of relatively complex structure, relatively large occupied volume, relatively slow steam outlet speed and the like, the invention provides a novel steam generator, which is shown in fig. 1 to 6. The steam generator includes:
a steam boiler 1 comprising a boiler heating element 17;
a waterway assembly 2 including a water pump 21 for pumping fluid or pumping fluid to the steam boiler 1; and
a unit controller for controlling the boiler heating power of the steam boiler 1 and the pumping power of the water pump 21.
Therefore, the steam generating device integrates the waterway assembly with the water pump and the unit controller for controlling the pumping power and the heating power, so that the steam generator has an integrated modular effect, related parameters are accurately controlled by the unit controller carried by the module, the effect of quickly discharging steam (discharging steam within 3 seconds) of the steam generator is realized, and the modular structure is more favorable for improving the purposes of miniaturization and generalization of a steam generator product. The unit controller of the steam generator can be communicated with the complete machine controller of the complete machine provided with the steam generator, so that the effect of quickly discharging steam of the complete machine product is finally realized.
Specifically, the steam generator may include a box 4, and the steam boiler 1, the waterway assembly 2 and the unit controller are all built in a box cavity of the box 4. Therefore, according to the generalization characteristic of the steam generating device, the steam generating device can be applied to various household steam cooking device products, and the steam generator of the invention integrates the steam boiler 1, the water pump 21, the control circuit and other parts in the box body 4 to form a module structure, thereby not only effectively compressing the module volume and being applied to various types of steam cooking device products, but also effectively improving the development period of the corresponding steam cooking device. Wherein the unit controller is typically centralized on a circuit board assembly 3 (see fig. 1 and 5).
As shown in fig. 5 and 6, the box body 4 is preferably a rectangular box, the unit controllers and the waterway assemblies 2 are arranged in an up-down stacked manner, and the steam boiler 1 and the unit controllers and the waterway assemblies 2 which are arranged in an up-down stacked manner are arranged along the length direction of the box cavity. Therefore, in the steam generator, the components are clearly distributed and properly arranged, the structure is more compact, and the service performance of the steam generator is more reliable.
Further, the cartridge 4 of the steam generator of the present invention preferably has a size range of: a miniaturized modular structure having a length of no more than 250mm, a width of no more than 100mm and a height of no more than 100 mm.
The modular steam generator of the present invention has a compact structure, is small and can achieve the effect of "second steam", and the inventor creatively improves and optimizes each functional component, which will be specifically explained in detail below.
As shown in fig. 11, in the steam generator of the present invention, the waterway assembly 2 includes a water pump 21 and a waterway plate 22. Referring to fig. 9 and 10, the waterway plate 22 is provided with an in-plate waterway, one end of the in-plate waterway is an external water port penetrating through the box body 4, the other end of the in-plate waterway is a boiler water receiving port 221 connected with the steam boiler 1, the waterway plate 22 is further provided with a water pump serial port, and the water pump 21 is inserted into the waterway plate 22 through the water pump serial port and is serially arranged in the in-plate waterway.
Therefore, the waterway assembly 2 not only concentrates the water pump 21 in the steam generator to facilitate the timely control of the pumping flow, but also provides the waterway plate 22 connected to the water pump 21 and the steam boiler 1, and the waterway plate 22 is provided to help further shorten the waterway length in the steam generator, thereby helping to increase the steam generation speed to achieve the effect of rapidly 'second-giving out steam'.
With continued reference to fig. 9 to 11, and fig. 16 and 17, in the waterway assembly 2 of the present invention, the water pump 21 includes a water inlet pump 211 and a water suction pump 212, the water inlet pump 211 is used for pumping the external fluid into the steam boiler 1, and the water suction pump 212 is used for pumping and discharging the steam boiler 1 outwardly; the external water inlet comprises an external water inlet 222 and an external water outlet 223; the water pump serial connection port comprises a water inlet pump serial connection inlet 211b, a water inlet pump serial connection outlet 211a, a water suction pump serial connection inlet 212a and a water suction pump serial connection outlet 212 b; the in-board water path comprises an in-board water inlet water path connected between the boiler water receiving port 221 and the external water inlet 222 and an in-board water pumping water path connected between the boiler water receiving port 221 and the external water outlet 223; the water inlet pump serial inlet 211b and the water inlet pump serial outlet 211a are arranged in the in-board water inlet waterway, and the water suction pump serial inlet 212a and the water suction pump serial outlet 212b are arranged in the in-board water suction waterway.
When the water inlet pump 211 works, external fluid enters from the external water inlet 222, sequentially flows through the in-plate water inlet waterway, enters the water inlet pump 211 from the water inlet pump serial inlet 211b, and flows to the boiler water receiving port 221 from the water pump serial outlet 211a and is pumped into the steam boiler 1. When the water pump 212 works, the waste liquid in the steam boiler 1 can be pumped out through the boiler water receiving port 221 and enter the water pump 212 from the water pump serial connection inlet 212a, and flows through the in-board water pumping water path in the process, so that the waste liquid in the steam boiler 1 is discharged outwards from the external water discharge port 223, and thus, the in-board water path in the whole water path board 22 is short, and the structure is simple and reasonable.
Specifically, as shown in fig. 9 and 10, the external water inlet and the boiler water inlet 221 may extend from the plate edge wall of the waterway plate 22, and the water pump string port extends from the first plate surface wall M of the waterway plate 22.
Meanwhile, the in-board waterway includes waterway grooves 24 formed on a second board-face wall N opposite to the first board-face wall M, so that the in-board waterway of the waterway board 22 is formed by cooperation of the respective water receiving ports and the waterway grooves 24. Referring to the waterway trench 24 shown in fig. 14, the in-board waterway of the present invention is preferably in the form of a slotted waterway because the slotted circulation waterway conducts heat more efficiently than a closed waterway, and further facilitates the water cooling of the thyristor unit 31 (see fig. 5) for adjusting heating power, and the detailed structure and principle are further described below. Of course, the in-plate water passage is not limited to the grooved water passage groove 24 described above, and may be a closed water passage groove.
To further close the water channel 24, the water channel plate 22 may be attached to the outer wall surface of the steam boiler 1.
Specifically, referring to fig. 9 to 13, the waterway plate 22 is preferably a rectangular plate, and in the first length direction of the waterway plate 22, the external water inlet 222, the external water outlet 223 and the boiler water receiving port 221 are sequentially and alternately arranged on the plate side wall of the same long side of the waterway plate 22, and the first plate side wall M is sequentially and alternately provided with a water inlet pump serial outlet 211a, a water inlet pump serial inlet 211b, a water suction pump serial outlet 212b and a water suction pump serial inlet 212 a.
Meanwhile, the external water inlet 230, the boiler water receiving port 221 and the water pump serial port are all communicated with the water channel groove 24, and the water channel groove 24 is arranged on a second plate surface wall N opposite to the first plate surface wall M. As shown in fig. 9, the waterway grooves 24 include a first waterway groove 241, a second waterway groove 242 and a third waterway groove 243, the first waterway groove 241 communicates the intake pump serial outlet 211a and the boiler water receiving port 221, the second waterway groove 242 communicates the intake pump serial inlet 211b and the external water inlet 222, and the third waterway groove 243 communicates the external water discharge port 223 and the water pump serial outlet 212 b.
Preferably, the waterway plate 22 may include a front half plate and a rear half plate which are overlapped in a thickness direction according to the structural characteristics of the first plate surface wall M and the second plate surface wall N having different structures of the waterway plate 22, which facilitates the manufacturing of the waterway plate 22. Meanwhile, the waterway plate 22 is provided with a screw mounting post and/or a mounting boss 224 (see fig. 10 and 15), and the screw mounting post and/or the mounting boss 224 (see fig. 10 and 15) is a connection fixing portion of the waterway plate 22.
Typically, the steam generator further comprises an external water tank fixedly mounted on the outer wall of the box 4 and abutting against the external water inlet, and correspondingly the waterway assembly 2 may communicate with the adjacent external water tank and/or waste water tank, and the external water inlet 222 communicates with the external water inlet tank, and the external water outlet 223 communicates with the external waste water tank.
In the box body 4 of the steam generator, the steam boiler 1, the waterway plate 22 of the waterway component 2 and the water pump 21 are sequentially arranged in a laminating way along the length direction of the box cavity, and the waterway is shorter.
The external outlet of the water circuit board 22 includes an external water inlet 222 and an external water outlet 223, and can be used to connect with corresponding water tanks (there may be 2 or more water tanks), but depending on the number and structure of the actual water tanks outside the box 4 of the steam generator, for example, a common steam cooking device usually includes only one water tank, so that in particular, the present invention provides a special water circuit board assembly, as shown in the preferred embodiments of fig. 12 to 15, the water circuit board assembly includes:
the water circuit board 22 is provided with a water receiving port (i.e. the boiler water receiving port 221, the following is consistent), an external water inlet 222 and an external water outlet 223, an in-board water inlet waterway is connected between the water receiving port and the external water inlet 222, a water inlet pump tandem inlet 211b and a water inlet pump tandem outlet 211a are arranged in the in-board water inlet waterway, an in-board water pumping waterway is connected between the water receiving port and the external water outlet 223, and a water pump tandem inlet 212a and a water pump tandem outlet 212b are arranged in the in-board water pumping waterway; and
the detachable joint cover 23 is detachably sleeved outside the external water inlet 222 and the external water outlet 223 and is provided with an external water inlet 230 communicated with the external water inlet 222 and the external water outlet 223 respectively.
It can be seen that the waterway plate assembly provided by the present invention includes not only the waterway plate 22 described above, but also an optional detachable joint cover 23 with a detachable function. Therefore, the waterway plate 22 with the detachable joint cover 23 can be applied to a case where only one water tank is provided or a case where both a water inlet tank and a waste water tank are provided. Whether dismouting joint cover 23 is selected for use according to actual conditions to make this waterway board subassembly's commonality higher, when outside water tank only has one, can use the waterway board subassembly that has this dismouting joint cover 23, thereby the correspondence is connected external water gap 230 and is connected outside water tank.
The present invention further provides a waterway assembly 2, as shown in fig. 11, in a preferred embodiment, the waterway assembly 2 includes a water inlet pump 211, a water pump 212 and the waterway assembly, the water inlet pump 211 and the water pump 212 are respectively inserted into the waterway plate 22, a water inlet and a water outlet of the water inlet pump 211 are respectively connected to the water inlet pump serial inlet 211b and the water inlet pump serial outlet 211a, and a water inlet and a water outlet of the water pump 212 are respectively connected to the water pump serial inlet 212a and the water pump serial outlet 212 b. Therefore, the waterway assembly 2 of the present invention also includes all the advantages of the waterway plate assembly described above, and the description thereof is omitted.
In the steam generator of the present invention, the circuit board assembly 2 may further incorporate therein thyristor units 31 (typically 3, for controlling the water inlet pump 211, the water suction pump 212 and the boiler heating element 17, respectively) for controlling the heating power of the boiler heating element 17 and the water pump power, see fig. 5 for a preferred embodiment, in particular, the thyristor units 31 are arranged in thermal contact with the circuit board 22. Therefore, because the existing silicon controlled rectifier units (such as IGBT modules) are used, the power electronic semiconductor devices are required to be matched with radiators when in use, so that the silicon controlled rectifier units are radiated to ensure the normal work of the silicon controlled rectifier units, and the silicon controlled rectifier unit 31 of the invention can realize the water-cooling radiation of the silicon controlled rectifier unit 31 by contacting the water circuit board 22, so that the radiators are replaced, thereby being beneficial to saving the installation space and further improving the miniaturization effect of the steam generator, and being beneficial to reducing the production cost of products.
Specifically, referring to fig. 5, 11 to 15, the steam generator is provided with a heat conductive plate 25 protruding from a side wall of the waterway plate 22, and the thyristor unit 31 is attached to the heat conductive plate 25. Generally, the one end welding of silicon controlled rectifier unit 31 is on the circuit board of circuit board components 3, therefore silicon controlled rectifier unit 31 can set up the heat-conducting plate 25 laminating setting of being convenient for in the edge of circuit board, ensures that silicon controlled rectifier unit 31 and heat-conducting plate 25's area of contact is enough big to in time realize contacting the heat dissipation effectively.
In the structure of the steam generator case 4, as shown in fig. 5, the circuit board assembly 3 and the water path assembly 2 are stacked up and down, the steam boiler 1 and the circuit board assembly 3 and the water path assembly 2 stacked up and down are arranged along the length direction of the case cavity, and the water path plate 22 is sandwiched between the water pump 21 and the steam boiler 1.
As shown in fig. 6, 9 and 10, the steam generator includes an isolation box 5 for separating the waterway assembly 2 from the circuit board assembly 3, and the circuit board assembly 3 is installed in the isolation box 5, so that the circuit board assembly 3 is separated from the structure of the waterway board assembly 2, the water and electricity separation effect is realized, the normal operation of the circuit board assembly 3 is ensured, and the service performance of the steam generator is ensured.
According to the above-described structure in which the plate inner water passages are formed in the water passage plate 22 in fig. 14, the water passage grooves 24 are formed in the second plate-face wall N, and preferably, the side of the water passage grooves 24 facing the steam boiler is provided in a grooved form, so that, as shown in fig. 11 to 15, the heat conduction plate 25 can be preferably fixed to the second plate-face wall N and covers the water passage grooves 24, and the heat conduction plate 25 is in direct contact with the fluid, and the heat radiation effect is more excellent.
To ensure the normal circulation of the in-board waterway of the waterway plate 22, as shown in fig. 15 and 16, an annular sealing member 26 is provided between the heat conductive plate 25 and the waterway plate 22 to ensure the sealing fluidity of the in-board waterway.
Meanwhile, since the water pump 21 includes the water inlet pump 211 and the water suction pump 212, the water inlet pump 211 is used for pumping fluid (generally, the temperature is normal temperature or low temperature) into the steam boiler 1 and heating the fluid by the steam boiler 1 to generate steam, and the water suction pump 212 is used for pumping the fluid in the steam boiler 1 for steam generation in the next cooking, the temperature of the fluid pumped by the water suction pump 212 is generally high and the heat dissipation effect on the thyristor unit 3 is not significant, and therefore, the thyristor unit 31 is preferably disposed at a side close to the water inlet pump 211, so that the water cooling effect of the thyristor unit 31 is better.
In a preferred embodiment of the steam boiler 1 of the steam generator of the present invention, referring to fig. 4 to 6, the steam boiler 1 comprises a boiler body 10 and a boiler heating element 17 disposed on the bottom wall of the boiler body 10, a partition member is disposed in the boiler chamber inside the boiler body 10 to sequentially form a water filtering chamber 11, a steam filtering chamber 12 and a condensing chamber 13 which are connected with a steam outlet pipe 16 above the liquid surface.
Therefore, in the steam boiler 1 of the present invention, when the steam boiler 1 is operated and generates steam, the steam is "filtered" by the water filtering chamber 11, the steam filtering chamber 12 and the condensing chamber 13 in order and then discharged from the steam outlet pipe 16. Thus, the steam boiler 1 of the present invention is a new type of steam boiler with a "filtered air and filtered water" boiler chamber, so that the steam led out from the steam outlet pipe 16 of the steam boiler 1 is free of large-particle steam and is saturated steam, thereby ensuring a good cooking effect of the steam boiler 1.
Specifically, the partition member includes a water filtering plate 14, as shown in fig. 7, the water filtering plate 14 is a grid plate with uniformly distributed filter pores 141, the water filtering plate 14 is disposed above the liquid surface at intervals, and the water filtering cavity 11 is formed between the water filtering plate 14 and the liquid surface. This is because when the fluid (e.g., water) in the steam boiler 1 is heated and boiled, a large number of bubbles are generated when the water is boiled, and water droplets are generated when the bubbles are burst, and these bubbles and water droplets are easily guided to the steam outlet (e.g., the steam outlet pipe 16) to form scale and block the steam outlet. The water filtering plates 14 which are uniformly provided with the filtering holes 141 which are helpful for uniformly breaking the bubbles are arranged in the invention, and the water filtering plates 14 are also beneficial to isolation and prevent water drops or water vapor generated after breaking from continuously flowing upwards, so that the water drops or water vapor can flow back and drop below the liquid level after breaking the bubbles. Therefore, after the water filtering plate 14 serving as a separation layer is additionally arranged, steam passes through the water filtering cavity 11 with the water filtering plate 14, water vapor in large bubbles can be preliminarily isolated and filtered, and meanwhile, the water filtering cavity 11 has the function of 'bubble breaking and water filtering' by being helped to avoid the water scale from blocking the steam outlet pipe 16.
Preferably, the drainage plate 14 is positioned no higher than 15mm above the highest liquid level.
Meanwhile, the partition member may further include a condensation cover 15 covering and fastened over the water filter 14, as shown in fig. 8, the steam filtering cavity 12 is formed between the condensation cover 15 and the water filter 14, and a top wall of the condensation cover 15 is provided with a plurality of air outlet holes 152. Therefore, when the steam enters the steam filtering cavity 12 after being filtered by the water filtering cavity 11, the condensation and filtration of large-particle water vapor can be further carried out in the steam filtering cavity.
Further, the top wall of the condensation cover 15 is formed with an air outlet convex plate 151 protruding upward, as shown in fig. 8, the air outlets 152 are uniformly distributed on the air outlet convex plate 151, and the area of the convex plate of the air outlet convex plate 151 is not greater than one half of the area of the top wall of the condensation cover 15. When the steam is discharged upwards from the condensation cover 15, it will impact and deflect at other positions of the top wall of the condensation cover 15 without the steam outlet holes 152, which will help the steam to be further filtered and condensed, and finally make the filtered steam be discharged from the steam outlet holes 152 of the concentrated steam outlet convex plate 151. Of course, the area of the outlet port convex plate 151 cannot be too small to occupy the total area, and the effect of smoothly flowing and discharging the steam upward is also considered.
In order to ensure the bubble breaking and gas filtering effects of the water filter plate 14 and the condensation cover 15, the pore diameter of the bubble filtering holes is preferably in the range of 5mm to 10mm, and the pore diameter of the gas outlet holes 152 is preferably in the range of 3mm to 8 mm.
Meanwhile, the height of the steam filtering cavity 12 is not higher than 15 mm.
Furthermore, as shown in fig. 6 and 8, the condensation chamber 13 is formed between the condensation cover 15 and the top wall of the boiler body 10, a backflow step portion 153 is formed at the edge of the top wall of the condensation cover 15, a backflow edge gap 142 is formed on the water filtering plate 14, and the condensed water on the top wall of the boiler body 10 can flow back to the bottom of the boiler chamber through the backflow step portion 153 and the backflow edge gap 142 in sequence, so that the steam is condensed again in the condensation chamber 13, thereby better ensuring that the steam led out from the steam boiler 1 is saturated steam. In addition, the backflow and recovery of the condensed water also contribute to improving the endurance of the water source.
To make the backflow effect more thorough, the backflow step 153 and the backflow edge notch 142 are located directly below the steam outlet pipe 16.
In the steam generator of the present invention, in order to increase the heating efficiency of the steam boiler 1 to achieve the effect of rapid steam generation, the boiler heating element 17 is preferably a thick film.
In order to enable the modular steam generator of the present invention to rapidly discharge steam, achieve "second steam discharge" and maintain the effect of continuously discharging steam in the subsequent process, in the circuit board assembly 3 of the present invention, the unit controller includes a flow process control module configured to: when the steam generator starts to work, the steam boiler 1 is started to heat at a preset heating power W and constant power, and simultaneously, the water pump 21 is started to supply liquid to the steam boiler 1 at an initial inlet liquid flow rate X1. Wherein, X1 is X0X Y, Y is a multiple constant not greater than 3 and not less than 1.5, and X0 is the current theoretical evaporation flow corresponding to the predetermined heating power W.
Because the water inflow of the steam boiler 1 is usually large under the condition of avoiding dry burning in the prior art, namely the initial liquid inlet flow X1 is set to be large, and the multiple Y is large. Typically, Y is set to be about 10 times or more, which in turn results in a slower steam outlet rate of existing steam boilers. In contrast, in the steam generator of the present invention, the key to the "second steam generation" is to reasonably control the feed water amount of the initial feed liquid flow rate X1 to achieve fast steam generation and avoid dry burning. Therefore, after heating power, namely preset heating power W is given, the corresponding current power theoretical evaporation liquid amount X0 is calculated, the initial liquid inlet flow rate is controlled to be Y times of X0, Y is within a reasonable range, and second steam outlet can be achieved, wherein Y is preferably a multiple value constant which is not more than 3 and not less than 1.5.
Generally, the theoretical amount of the evaporation liquid X0 satisfies:
wherein C1 is the specific heat capacity of the liquid, T0 is the initial liquid temperature, T1 is the boiling point temperature of the liquid, and C2 is the vaporization thermal parameter of the liquid. Therefore, when the predetermined heating power W is given, the theoretical amount of evaporation liquid X0 of the current power can be obtained according to the above formula (1).
Simultaneously, the unit controller still includes heating frequency control module, and heating frequency control module sets up to: obtaining preset heating power W according to the set second steam outlet time T and the multiple value constant Y, wherein the preset heating power W meets the following requirements:
W*T≥X1*T*Q1+Q3*m1； (2)
wherein,
c1 is the specific heat capacity of liquid, C2 is the vaporization heat parameter of liquid, C3 is the specific heat capacity of the material of the surrounding wall of the furnace of the steam boiler 1, T0 is the initial liquid temperature, T1 is the boiling temperature of liquid, m1 is the mass of the surrounding wall of the furnace, Q1 is the amount of heat absorbed during the rise of the unit mass of liquid from T0 to T1 in unit time, and Q3 is the amount of heat absorbed during the rise of the unit mass of the surrounding wall of the furnace from T0 to T1 in unit time.
In the modularized steam generator, the unit controller controls and realizes the control of three main variable parameters of second steam output, namely the second number of output steam T, the preset heating power W and the multiple Y of the current theoretical power evaporation flow. Referring to fig. 21, in different application situations, by giving the steam seconds T and the multiple Y within a reasonable range, the steam generator of the present invention can determine the predetermined heating power W through a calculation and comparison unit or a table query unit in a heating frequency control module of a unit controller, and further adjust the corresponding predetermined heating power W through a thyristor unit 31 on hardware, so as to implement the universal application and design of the modular steam generator.
The steam generator can realize the effect of quickly discharging steam, and the steam discharging time T per second can be not more than 3 seconds theoretically.
In the experiment, water with the temperature of 25 ℃ is introduced into the steam boiler 1 to be heated and boiled so as to generate steam. The material of the circumferential wall of the hearth of the steam boiler 1 is stainless steel, the specific heat capacity C1 of water is 4.186KJ/Kg, the gasification heat parameter C2 of the water is 2257.2KJ/Kg, the specific heat capacity C3 of the stainless steel is 0.449KJ/Kg, the initial liquid temperature T0 is 25 ℃, the boiling temperature T1 of the water is 100 ℃, and the mass m1 of the circumferential wall of the hearth is 91.3 g. According to the calculation of the formula (2) and the formula group (3), when the preset heating power W is 2000W, and Y is 2.3 times, the steam second number T of the steam generation period in theory of the initial generation of the steam can be calculated to be about 3 seconds.
During the use process of the modular steam generator, the flow process control module of the unit controller limits reasonable fluctuation adjustment of the flow on a time axis, namely timely adjusting the liquid inlet flow Y X0, and can realize faster steam outlet, namely so-called 'second steam outlet' and continuous steam outlet and prevent dry burning.
Make unit controller realize preventing dry combustion method and avoid leading to unable quick or lasting steam because of heating excessive water for real-time supervision water level in steam boiler 1's feed liquor in-process, be equipped with liquid level detector (not shown) in steam boiler 1, flow process control module still configures into: during the continuous heating-out of steam from the steam generator, the water pump 21 is controlled such that the boiler level inside the steam boiler 1 is between the dry-burning prevention level and the excess level.
To ensure that the steam generator can keep continuously generating steam after achieving the initial 'second steam generation', so that the steam can not be interrupted and can still keep continuously generating steam in the process of liquid replacement. In this regard, the flow process control module is further configured to:
when the initial boiler liquid level in the steam boiler 1 reaches a preset control liquid level, the liquid inlet flow is adjusted from the initial liquid inlet flow X1 to the current theoretical power evaporation flow X0; and
continuously detecting the liquid level of the boiler, and when the liquid level of the boiler is higher than a preset control liquid level within continuous overproof detection time T', reducing the liquid inlet flow and adjusting the liquid inlet flow to be reduced liquid inlet flow X3;
or when the liquid level of the boiler is lower than the preset control liquid level within the continuous overproof detection time T', increasing the liquid inlet flow and adjusting the liquid inlet flow to be the incremental liquid inlet flow X4;
wherein the preset control liquid level is between the dry burning prevention liquid level and the excessive liquid level.
Preferably, the decrement inlet flow rate X3 is half of the current power theoretical evaporation flow rate X0, and the increment inlet flow rate X4 is twice of the current power theoretical evaporation flow rate X0, so as to ensure that the boiler liquid level in the steam boiler 1 is maintained between the dry-burning prevention liquid level and the excess liquid level.
Wherein, the overproof detection time T' is inversely proportional to the multiple value constant Y.
Meanwhile, the flow process control module is further configured to: when the steam generator stops working, the water pump 21 is controlled to pump liquid to exhaust the fluid in the steam boiler 1, so that the residual liquid in the steam boiler 1 can be prevented from scaling, and meanwhile, the water pump is ready for the next starting and the rapid steam discharging is ensured.
In addition, the present invention also provides a steam cooking apparatus, as shown in fig. 18 to 20, which includes a cooking cavity 800, and also includes the steam generator, and the steam generator introduces steam into the cooking cavity 800. Therefore, the steam cooking device of the present invention also includes all the advantages of the steam generator described above, and thus, the detailed description thereof is omitted.
In the conventional steam cooking device, before steam is introduced into the cooking cavity 800, the inner wall of the cooking cavity 800 and the interior of the cooking cavity are both in a low-temperature environment. If direct let in the culinary art cavity 800 that is in low temperature environment with steam in, not only make the ambient temperature rise speed in the culinary art cavity 800 slow, lead to steam to meet microthermal internal wall face moreover very easily and form on the comdenstion water directly drips to food, this taste that not only can influence food still can influence the outward appearance of food to influence the culinary art effect of food, for example when culinary art steamed bun, can influence the fermentation inflation etc. effect of steamed bun. To this end, the steam cooking apparatus of the present invention further includes a preheating heating element disposed around the outer wall of the cooking cavity 800 and a complete machine controller in communication with the unit controller, the complete machine controller being configured to: when the steam boiler 1 is controlled to be heated by the unit controller, the preheating heating element is synchronously started to preheat the cooking cavity 800, so that when the steam boiler 1 is heated, the function of preheating the cooking cavity 800 is synchronously started, so that the environment in the cooking cavity 800 is quickly preheated.
The preheating heating power of the preheating heating element is obtained by subtracting the boiler power and the pumping power from the maximum heating power of the steam cooking device, so that the working power of the steam cooking device does not exceed the highest rated heating power used by the whole machine.
Referring to fig. 19 and 20, the preheating heating elements include a top wall preheating element 601 for heating the top wall of the cooking cavity 800, a rear wall preheating element 602 for heating the rear wall of the cooking cavity 800, and a bottom wall preheating element 603 for heating the bottom wall of the cooking cavity 800, and the overall controller is further configured to: the top wall preheating element 601, the rear wall preheating element 602 and the bottom wall preheating element 603 are activated in sequence so that the top wall preheating element 601, the rear wall preheating element 602 and the bottom wall preheating element 603 are operated intermittently in sequence.
In addition, most of the existing cooking cavities 800 adopt enamel materials with good performance as cavity materials, so that in order to prevent the problems of color change or deformation of the enamel cavities under high-temperature heating, the preheating heating elements are arranged at intervals with the outer wall surface of the cooking cavity 800, so that the preheating heating elements form non-contact heating on the outer wall surface of the cooking cavity 800.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (13)
1. A steam generator, characterized in that the steam generator comprises:
a steam boiler (1) comprising a boiler heating element (17);
a water circuit assembly (2) comprising a water pump (21) for pumping fluid or pumping fluid to the steam boiler (1); and
a unit controller for controlling the boiler heating power of the steam boiler (1) and the pumping power of the water pump (21).
2. The steam generator according to claim 1, comprising a cartridge (4), wherein the steam boiler (1), the waterway assembly (2) and the unit controller are all built into a cartridge cavity of the cartridge (4).
3. The steam generator according to claim 2, wherein the box body (4) is a rectangular box, the unit controller and the waterway assembly (2) are stacked up and down, and the steam boiler (1) and the unit controller and the waterway assembly (2) stacked up and down are arranged along the length direction of the box cavity.
4. The steam generator according to any of claims 1 to 3, comprising a circuit board assembly electrically connected to the boiler heating element (17), the circuit board assembly (2) having integrated therein a thyristor unit (31) for controlling the boiler heating power of the boiler heating element (17).
5. The steam generator according to claim 4, characterized in that the water circuit assembly (2) comprises a water circuit board (22), the water pump (21) comprises a water inlet pump (211) and a water suction pump (212), the water inlet pump (211) and the water suction pump (212) are plugged onto the water circuit board (22) and pump fluid or pump fluid through the water circuit board (22) to the steam boiler (1).
6. The steam generator according to claim 5, characterized in that contact heat conduction is formed between the thyristor unit (31) and the water circuit board (22).
7. The steam generator of claim 6, wherein the water circuit board (22) comprises a boiler water receiving port (221), an external water inlet port (222) and an external water outlet port (223), an in-board water inlet waterway is connected between the boiler water receiving port (221) and the external water inlet port (222), the in-board water inlet waterway is provided with the water inlet pump (211), an in-board water pumping waterway is connected between the boiler water receiving port (221) and the external water outlet port (223), and the in-board water pumping waterway is provided with the water pumping pump (212);
the waterway assembly (2) further comprises a detachable joint cover (23), and the detachable joint cover (23) is detachably sleeved outside the external water inlet (222) and the external water outlet (223) and is provided with an external water inlet (230) communicated with the external water inlet (222) and the external water outlet (223) respectively.
8. The steam generator according to claim 7, wherein the thyristor unit (31) is disposed proximate to an in-board water inlet waterway side of the waterway board (22) to conduct heat in contact with the waterway board (22).
9. The steam generator according to claim 4, characterized in that the steam boiler (1) comprises a boiler body (10), the boiler heating element (17) is arranged on the bottom wall of the boiler body (10), a separation layer is arranged in the boiler chamber in the boiler body (10) to form a water filtering chamber (11), a steam filtering chamber (12) and a condensing chamber (13) which are communicated with each other by air holes above the liquid level in sequence, and a steam outlet pipe (16) is connected to the top of the condensing chamber (13);
the separation layer piece comprises a water filtering plate (14), the water filtering plate (14) is a hole grid plate with uniformly distributed filter holes, the water filtering plate (14) is arranged above the liquid level at intervals, and the water filtering cavity (11) is formed between the water filtering plate (14) and the liquid level;
the interlayer piece also comprises a condensation cover (15) which covers and is buckled above the water filter plate (14), the steam filtering cavity (12) is formed between the condensation cover (15) and the water filter plate (14), and the top wall of the condensation cover (15) is provided with a plurality of air outlet holes (152);
the condensation cavity (13) is formed between the condensation cover (15) and the top wall of the boiler body (10), a backflow step part (153) is formed at the edge of the top wall of the condensation cover (15), a backflow edge notch (142) is formed on the water filtering plate (14), and condensed water on the top wall of the boiler body (10) can sequentially flow back to the bottom of the boiler cavity through the backflow step part (153) and the backflow edge notch (142).
10. The steam generator of claim 1, wherein the unit controller comprises:
the heating frequency control module is configured to determine preset heating power W at least according to the set second steam outlet time T; and
a flow process control module configured to control an initial inlet flow rate X1 of the steam boiler to achieve a second steam take-off within the second steam take-off period T while heating at the predetermined heating power woc.
11. The steam generator of claim 10, wherein the flow process control module is further configured to: when the steam generator stops working, the water pump (21) is controlled to pump liquid to exhaust the fluid in the steam boiler (1).
12. A steam cooking device comprising a cooking cavity (800), characterized in that it further comprises a steam generator according to any one of claims 1 to 11, said steam generator introducing steam into said cooking cavity (800).
13. The steam cooking device of claim 12, further comprising a preheating heating element disposed around an outer wall of the cooking cavity (800) and a machine controller in communication with the unit controller, the machine controller configured to:
when the steam boiler (1) is controlled to be heated through the unit controller, the preheating heating elements are synchronously started to preheat the cooking cavity (800);
wherein the preheating heating power of the preheating heating element is the maximum heating power of the steam cooking device minus the boiler power and the pumping power.
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