CN114698159A - Thick film heater, vapor generator, control method and storage medium - Google Patents
Thick film heater, vapor generator, control method and storage medium Download PDFInfo
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- CN114698159A CN114698159A CN202011632603.5A CN202011632603A CN114698159A CN 114698159 A CN114698159 A CN 114698159A CN 202011632603 A CN202011632603 A CN 202011632603A CN 114698159 A CN114698159 A CN 114698159A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/03—Electrodes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/04—Waterproof or air-tight seals for heaters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
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Abstract
The invention provides a thick film heater, a steam generator, a control method and a computer readable storage medium. The present invention provides a thick film heater comprising: the heating layer is used for providing a heat source; the induction layer is used for controlling the heating layer; the coating layer is used for protecting the induction layer and the heating layer; wherein, the induction layer is arranged between the heating layer and the coating layer. Through above-mentioned thick film heater, can control the operating power of zone of heating to judge whether need will generate heat the layer outage according to operating parameter, in order to prevent to cause thick film heater's burnout and rupture of membranes because the high temperature, improved the stability of thick film heater operation.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a thick film heater, a steam generator, a control method of the steam generator and a computer readable storage medium.
Background
In the related technology, the thick film heating technology is adopted to replace the traditional heating tube for heating, but the thick film heating still has the defects of fast temperature rise and difficult control, and the situation of burning out the explosion film due to dry burning or water scale in practical application can be realized.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention provides a thick film heater.
The second aspect of the present invention also provides a steam generator.
The third aspect of the present invention also provides a control method of a steam generator.
The fourth aspect of the present invention also provides a computer-readable storage medium.
In view of this, a first aspect of the present invention provides a thick film heater comprising: the heating layer is used for providing a heat source; the induction layer is used for controlling the heating layer; the coating layer is used for protecting the induction layer and the heating layer; wherein, the induction layer is arranged between the heating layer and the coating layer.
The thick film heater provided by the invention comprises a heating layer, an induction layer and a coating layer. Wherein, provide the heating function that the heat satisfies thick film heater through the layer that generates heat, control thick film heater's the layer that generates heat through the response layer to obtain the operating parameter on response layer, protect the response layer and the layer that generates heat through the coating, keep apart with external environment. Wherein, the induction layer is arranged between the heating layer and the coating layer. Through above-mentioned thick film heater, can control the operating power of zone of heating to judge whether need will generate heat the layer outage according to operating parameter, in order to prevent to cause thick film heater's burnout and rupture of membranes because the high temperature, improved the stability of thick film heater operation.
According to the thick film heater provided by the invention, the following additional technical characteristics can be provided:
in the above technical solution, further, the sensing layer includes: a graphite electrode layer; a temperature sensing layer; a silver electrode layer; the temperature sensing layer is arranged between the graphite electrode layer and the silver electrode layer, the silver electrode layer is connected with the heating layer, and the silver electrode layer is connected with the cladding layer.
In the technical scheme, the induction layer comprises a graphite electrode layer, a temperature sensing layer and a silver electrode layer. The silver electrode layer is arranged on the heating layer, the induction layer is arranged on the silver electrode layer, and the graphite electrode layer is arranged on the temperature sensing layer. The sensing layer is made of multiple components according to a certain proportion and can be equivalent to a plurality of parallel resistors, so that the proper sensing layer can be selected according to the resistance-temperature change characteristic of the temperature sensing layer by changing the components and the proportion of the temperature sensing layer. The operation parameters of the induction layer are detected, and the operation temperature of the heating layer can be judged, so that the working power of the heating layer is controlled, the thick film heater is prevented from being burnt and exploded due to overhigh temperature, and the operation stability of the thick film heater is improved.
According to a second aspect of the present invention, there is also provided a steam generator comprising the thick film heater of any one of the above aspects; the shell and the thick film heater form a cavity; and the control circuit module is connected with the thick film heater and used for controlling the thick film heater to work, and the control circuit module is arranged on the shell.
The invention provides a steam generator which comprises a thick film heater, a shell and a control circuit module. The thick film heater and the shell form a cavity, and the thick film heater can heat liquid in the cavity so as to generate steam. The control circuit module is arranged on the shell and connected with the thick film heater, and can control the thick film heater. Above-mentioned steam generator can make steam, can control its heating power according to the behavior of thick film heater simultaneously to prevent to cause thick film heater's burnout and rupture of membranes because the high temperature, guaranteed steam generator's quality and life.
According to the present invention, the above steam generator may further have the following additional features:
in the above technical solution, further, the control circuit module includes: the power control module is connected with the heating layer and is used for controlling the working power of the heating layer; the parameter detection module is connected with the induction layer and used for detecting the operation data of the induction layer.
In the technical scheme, the control circuit module comprises a power control module and a parameter detection module. The power control module is connected with the heating layer and used for controlling the working power of the heating layer. The parameter detection module is connected with the sensing layer and used for detecting the operation data of the sensing layer. Specifically, the current temperature of the heating layer can be reflected through the operation data of the induction layer, so that the working state of the heating layer can be controlled, the thick film heater is prevented from being burnt and exploded due to overhigh temperature, and the quality and the service life of the steam generator are ensured.
In any of the above technical solutions, further, the steam generator further includes: and the heat dissipation module is connected with the power control module and is used for dissipating heat of the power control module.
In the technical scheme, the heat dissipation module is connected with the power control module, and the power control module can generate heat in the working process, so that the heat dissipation module is arranged to dissipate heat of the power control module, the control accuracy of the power control module is improved, and the working effect of the steam generator is ensured.
In any of the above technical solutions, further, the steam generator further includes: the liquid level detection module is arranged in the cavity.
In this technical scheme, steam generator still is provided with liquid level detection module, and liquid level detection module sets up in the cavity, can detect the liquid level in the cavity through liquid level detection module, can judge whether to the work of supplementary liquid in the cavity or the stop heating layer according to the liquid level in the cavity to prevent that the thick film heater from taking place the condition of dry combustion method, guaranteed the security that steam generator used.
In any of the above technical solutions, further, the steam generator further includes: and the sealing component is used for sealing connection of the thick film heater and the shell.
In the technical scheme, the thick film heater and the shell are sealed through the sealing component, so that liquid in the cavity is prevented from leaking, and the use quality of the steam generator is guaranteed.
In any of the above technical solutions, further, the steam generator further includes: the first water pump is communicated with the cavity and is used for providing liquid into the cavity; and the second water pump is communicated with the cavity and is used for pumping back liquid in the cavity.
In this technical scheme, steam generator still includes first water pump and second water pump. The first water pump is communicated with the cavity, the other end of the first water pump is communicated with a water supply pipe or other water sources, and supplementary liquid can be provided in the cavity through the first water pump. The second water pump is communicated with the cavity, the other end of the first water pump is communicated with a drain pipe or other collecting devices, and liquid in the cavity can be pumped back through the second water pump. Through the work of controlling first water pump and second water pump, can adjust the liquid level in the cavity, can in time moisturizing when the water level is low, can take back water when the water level is high to steam generator's effect that produces steam has been improved, the security of steam generator use has been ensured simultaneously.
According to a third aspect of the present invention, there is provided a control method of a steam generator, adapted to the steam generator as in any of the above embodiments, the control method comprising: acquiring operating parameters of an induction layer of the thick film heater; and controlling the heating layer to be powered off according to the operation parameters, and supplementing water into the cavity.
According to the control method of the steam generator provided by the invention, the operation parameters of the induction layer of the thick film heater are obtained, the operation condition of the heating layer is judged according to the operation parameters, and if the current temperature is too high, the heating layer is powered off, and water is supplemented into the cavity. The burning and the film explosion of the thick film heater caused by overhigh temperature are prevented, and the running stability of the steam generator is improved.
According to the control method of the steam generator provided by the invention, the following additional technical characteristics can be provided:
in above-mentioned technical scheme, further, thick film heater's response layer includes graphite electrode layer and silver electrode layer, and the step of the layer outage that generates heat is controlled according to the operating parameter specifically includes:
the operation parameters comprise leakage resistance between the graphite electrode layer and the silver electrode layer, and timing is started when the leakage resistance is smaller than or equal to a preset resistance value; and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In the technical scheme, the induction layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, leakage resistance between the graphite electrode layer and the silver electrode layer is obtained, and timing is started when the leakage resistance is smaller than or equal to a preset resistance value. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. When the leakage resistance is smaller than the preset resistance value, the temperature of the heating layer is over high, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploding due to over high temperature.
In above-mentioned technical scheme, further, thick film heater's response layer includes graphite electrode layer and silver electrode layer, and the step of the layer outage that generates heat is controlled according to the operating parameter specifically includes: the operation parameters comprise leakage current between the graphite electrode layer and the silver electrode layer, and when the leakage current is greater than or equal to a preset current value, timing is started; and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In the technical scheme, the induction layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, leakage current between the graphite electrode layer and the silver electrode layer is obtained, and timing is started when the leakage current is larger than or equal to a preset resistance value. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. When the leakage current is larger than the preset resistance value, the temperature of the heating layer is over high, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploding due to over high temperature.
In above-mentioned technical scheme, furtherly, thick film heater's response layer includes temperature sensing layer, graphite electrode layer and silver electrode layer, and the step of the layer outage that generates heat is controlled according to the operating parameter specifically includes: the operation parameter is a temperature value of the temperature sensing layer, and when the temperature value is greater than or equal to a preset temperature value, timing is started; and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In this technical scheme, thick film heater's response layer includes graphite electrode layer and silver electrode layer and response layer, through obtaining the current temperature value of response layer, when the temperature value is greater than or equal to preset temperature value, just begins the timing. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. Because the induction layer is connected with the heating layer, the temperatures of the induction layer and the heating layer are similar. When the temperature value on response layer was greater than when predetermineeing the temperature, then showed that the temperature on layer that generates heat can be too high, will generate heat the layer outage this moment, reach the effect of cooling to prevent to cause burning out and the rupture of membranes of thick film heater because the high temperature.
In the above technical solution, further, the preset temperature value ranges from 150 ℃ to 250 ℃.
In the technical scheme, the standard of judging whether the temperature is too high is adopted, and the value range of the preset temperature value is 150-250 ℃, wherein the preferable temperature value is 200 ℃. When the thick film heater is exposed to temperatures in the range of 150 c to 250 c for extended periods of time, a popping event may occur. Therefore, when the temperature of the induction layer is detected to exceed the preset temperature value, the temperature of the heating layer is indicated to also exceed the preset temperature value, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploding due to overhigh temperature.
In the above technical solution, further, the steam generator includes a liquid level detection module, and the control method further includes: and acquiring a liquid level parameter of the liquid level detection module, and controlling the heating layer to be powered off and supplementing water into the cavity if the liquid level parameter is smaller than a preset liquid level value.
In this technical scheme, steam generator includes the liquid level detection module, and through the liquid level parameter who acquires the liquid level detection module, if the liquid level parameter is less than preset liquid level value, then the water level in the current steam generator's of surface cavity is lower. The layer outage that generates heat is controlled this moment to moisturizing in to the cavity, thereby guarantee that the water level in the cavity is normal, prevent therefore that the cavity water-logging from burning out, cause destruction to the thick film heater, keep the normal water level in the cavity simultaneously, can also guarantee that steam generator produces steam and is not influenced.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the control method of the steam generator according to any one of the above third aspects, thereby achieving all the technical effects of the control method of the steam generator, and the details of which are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic of the construction of a thick film heater according to one embodiment of the invention;
fig. 2 is a schematic view illustrating a structure of a steam generator according to an embodiment of the present invention;
FIG. 3 is a schematic structural view illustrating another perspective of the steam generator of the embodiment shown in FIG. 2;
fig. 4 is a partial structural view illustrating a steam generator of the embodiment shown in fig. 2;
fig. 5 is a schematic view illustrating an internal structure of the steam generator of the embodiment shown in fig. 2;
fig. 6 is a flowchart illustrating a control method of a steam generator according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a control method of a steam generator according to another embodiment of the present invention;
fig. 8 is a flowchart illustrating a control method of a steam generator according to another embodiment of the present invention;
fig. 9 is a flowchart illustrating a control method of a steam generator according to another embodiment of the present invention;
FIG. 10 shows an equivalent circuit diagram of the sense layer of one embodiment of the present invention;
FIG. 11 shows a temperature sensing layer 1/R-T plot of an embodiment of the present invention;
FIG. 12 shows a flow diagram of an anti-dry-burn algorithm of an embodiment of the present invention;
FIG. 13 shows a schematic dry-fire test of an embodiment of the present invention;
FIG. 14 shows a schematic dry-fire test of another embodiment of the present invention;
FIG. 15 shows a schematic dry-fire test of another embodiment of the present invention;
FIG. 16 shows a schematic dry-fire test of another embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:
10 thick film heater, 100 heating layer, 102 steel plate layer, 104 first dielectric layer, 106 heating wire layer, 108 second dielectric layer, 110 induction layer, 112 graphite electrode layer, 114 temperature sensing layer, 116 silver electrode layer, 120 coating layer;
12 shell, 14 control circuit module, 142 power control module, 144 heat dissipation module;
16 liquid level detection modules, 18 sealing parts, 202 a first water pump, 204 a second water pump and 22 a silica gel water pipe.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A thick film heater, a steam generator, a control method of the steam generator, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 16.
The first embodiment is as follows:
as shown in fig. 1, according to one embodiment of the present invention, the present invention provides a thick film heater 10 comprising: a heat generating layer 100, an induction layer 110 and a cladding layer 120. The heating layer 100 is used for providing a heat source, the sensing layer 110 is used for controlling the heating layer 100, and the covering layer 120 is used for protecting the sensing layer 110 and the heating layer 100. Wherein, the induction layer 110 is disposed between the heat generating layer 100 and the cladding layer 120.
Specifically, the heat generating layer 100 includes a steel plate layer 102, a dielectric layer, and a heating wire layer 106. The steel plate layer 102 is sequentially printed with a first medium layer 104, a heating wire layer 106 and a second medium layer 108. One side of the steel layer 102 is in contact with the heated liquid, and the other side of the steel layer 102 is connected to a heating wire layer 106 of a heating source through a first dielectric layer 104. The heating wire layer 106 transfers heat to the steel plate layer 102 by heat conduction, thereby heating the heated liquid and generating steam for use. The induction layer 110 is arranged on the heating layer 100, the heating layer 100 transfers heat to the induction layer 110 through the second medium layer 108, and the heating power of the heating layer 100 can be controlled through the operating parameters of the induction layer 110, so that the stable heating of the thick film heater 10 is realized. A cladding layer 120 is disposed over the sense layer 110 for protecting the entirety of the thick film heater 10.
The thick film heater 10 provided by the invention comprises a heat generating layer 100, an induction layer 110 and a coating layer 120. The working power of the heating layer is controlled by the condition of the induction layer 110, and whether the heating layer 100 needs to be powered off or not is judged, so that the thick film heater 10 is prevented from being burnt and exploded due to overhigh temperature, and the running stability of the thick film heater 10 is improved.
Example two:
as shown in fig. 1, according to an embodiment of the present invention, the features defined in the above embodiment are included, and: the sensing layer 110 specifically includes: a graphite electrode layer 112, a temperature sensing layer 114, and a silver electrode layer 116. The temperature sensing layer 114 is disposed between the graphite electrode layer 112 and the silver electrode layer 116, the silver electrode layer 116 is connected to the heat generating layer 100, and the silver electrode layer 116 is connected to the clad layer 120.
Specifically, the sensing layer 110 may be made of alkali metal oxide, glass component, functional additive, modifying additive, etc. according to a certain ratio. As shown in fig. 10, the actual resistance of the sensing layer 110 can be equivalent to several resistances connected in parallel, and it can be seen that any decrease in resistance can decrease the actual resistance of the sensing layer 110. Therefore, by changing the composition and ratio of the sensing layer 110, the physical resistance-temperature characteristics of the sensing layer 110 can be controlled, and thus an appropriate ratio value can be selected to fabricate the sensing layer 110. The physical characteristics of the sensing layer 110 can accurately reflect the change of the heating layer, and control the operation power of the heating layer according to the change.
In this embodiment, the sensing layer 110 includes a graphite electrode layer 112, a temperature sensing layer 114, and a silver electrode layer 116. Wherein the silver electrode layer 116 is disposed on the heating layer, the sensing layer 110 is disposed on the silver electrode layer 116, and the graphite electrode layer 112 is disposed on the temperature sensing layer 114. The sensing layer 110 is made of a plurality of components according to a certain proportion and can be equivalent to a plurality of parallel resistors, so that by changing the components and proportion of the temperature sensing layer 114, a proper sensing layer 110 can be selected according to the resistance-temperature change characteristic of the temperature sensing layer 114. Through detecting the operating parameter to inductive layer 110, can judge the operating temperature of zone of heating to control the operating power of zone of heating, prevent to cause burning out and the rupture of thick film heater 10 because the high temperature, improved the stability of thick film heater 10 operation.
Example three:
according to a second aspect of the present invention there is also provided a steam generator comprising the thick film heater 10, the housing 12 and the control circuit module 14 of any of the first reverse examples above. Wherein, the casing 12 and the thick film heater 10 form a cavity, the control circuit module 14 is connected with the thick film heater 10 for controlling the operation of the thick film heater 10, and the control circuit module 14 is arranged on the casing 12.
In this embodiment, the steam generator comprises a thick film heater 10, a housing 12 and a control circuit module 14. The housing 12 and the thick film heater 10 form a cavity for storing water. The thick film heater can generate steam for use by heating the liquid in the cavity. The control circuit module 14 is disposed on the housing 12, and the control circuit module 14 is connected to the thick film heater 10 to control the operation of the thick film heater 10. Above-mentioned steam generator can make steam, can control its heating power according to the behavior of thick film heater simultaneously to prevent to cause thick film heater 10 to burn and explode the membrane because the high temperature, guaranteed steam generator's quality and life.
Specifically, the control Circuit module 14 may be a Printed Circuit Board (PCB) control Board, and receives a power command of the system through a communication serial port of the PCB control Board, and controls the power of the thick film heater 10 according to the power command.
Specifically, the material of the housing 12 is a food-grade PPS (Polyphenylene sulfide) material or other food-grade plastic material, which does not generate harmful substances in a high-temperature environment and conforms to the use environment of the thick film heater 10.
Example four:
according to an embodiment of the invention, comprising the features defined in the above embodiment, and: the steam generator further comprises a control circuit module 14, the control circuit module 14 comprising: a power control module 142 and a parameter detection module. The power control module 142 is connected with the heat generating layer 100, and the power control module 142 is used for controlling the working power of the heat generating layer 100; the parameter detection module is connected to the sensing layer 110, and the parameter detection module is configured to detect operation data of the sensing layer 110.
As shown in fig. 2, in this embodiment, the control circuit module 14 includes a power control module 142 and a parameter detection module. The power control module 142 is connected to the heat generating layer 100, and is configured to control the operating power of the heat generating layer 100. The parameter detecting module is connected to the sensing layer 110, and is configured to detect operation data of the sensing layer 110. Specifically, the current temperature of the heating layer 100 can be reflected by the operation data of the sensing layer 110, so that the working state of the heating layer 100 can be controlled, the thick film heater 10 is prevented from being burnt and exploded due to overhigh temperature, and the quality and the service life of the steam generator are ensured.
Specifically, the power control module 142 in the control circuit module 14 is a thyristor, and the heating power of the thick film heater 10 can be controlled by the thyristor. When liquid is injected into the cavity, the liquid is changed into high-temperature steam through the heating of the heating layer, and the high-temperature steam is discharged from the air outlet for use. The operating power of the heating layer can be controlled through the controllable silicon, so that the heating layer is controlled to work within a safe temperature range, and the thick film heater 10 is prevented from being burnt.
Example five:
according to an embodiment of the invention, comprising the features defined in the above embodiment, and: the steam generator further comprises a heat dissipation module 144, the heat dissipation module 144 is connected with the power control module 142, and the heat dissipation module 144 is used for dissipating heat of the power control module 142.
As shown in fig. 3 and 5, in this embodiment, the heat dissipation module 144 is connected to the power control module 142, and since the power control module 142 generates heat during operation, the heat dissipation module 144 is configured to dissipate heat from the power control module 142, so as to improve the control accuracy of the power control module 142, thereby ensuring the operation effect of the steam generator.
Specifically, the heat dissipation module 144 is a heat dissipation device for dissipating heat from the power control module 142 to ensure the normal operation of the power control module 142. The heat dissipation device can be a fan or a water-cooling heat dissipation device, wherein the water-cooling heat dissipation device has a better heat dissipation effect, the cost of the fan is lower, and technicians can select the heat dissipation device according to specific conditions.
Example six:
according to an embodiment of the invention, comprising the features defined in the above embodiment, and: the steam generator further comprises a liquid level detection module 16, the liquid level detection module 16 being arranged within the cavity.
As shown in fig. 2, in this embodiment, the liquid level detection module 16 is disposed in the cavity, the liquid level in the cavity can be detected by the liquid level detection module 16, and whether to supplement liquid into the cavity or stop the heating layer according to the liquid level in the cavity can be determined, so as to prevent the thick film heater 10 from being dried, and ensure the safety of the steam generator.
Specifically, the liquid level detection module 16 is a liquid level probe, and the liquid level probe is disposed in the cavity and is used for detecting the liquid level in the cavity in real time. The liquid level in the cavity can be used for supplementing water to the cavity, the water in the cavity is heated to boiling, and steam can be generated and discharged for use. The water level in the cavity can be detected, and when the water level is low, water can be timely supplemented into the cavity. The water in the cavity can be pumped back when the water level is high, and the thick film heater 10 can rapidly generate steam under low operation power by reducing the volume of the water in the cavity. The thick film heater 10 is prevented from being burnt and exploded due to overhigh temperature in a high-power state of the thick film heater 10 for a long time, and the use safety of the steam generator is ensured.
Example seven:
according to an embodiment of the invention, comprising the features defined in the above embodiment, and: the steam generator further comprises a sealing member 18, the sealing member 18 being for sealing connection of the thick film heater 10 and the housing 12.
In this embodiment, as shown in fig. 4, the thick film heater 10 and the housing 12 are hermetically connected by the sealing member 18, so as to ensure the sealing performance of the cavity and prevent the liquid from leaking out, thereby ensuring the use quality of the steam generator.
Specifically, the sealing member 18 is a sealing silicone ring made of food-grade silicone rubber, and has a high-temperature resistance. Therefore, the food-grade silicone rubber is selected, no harmful substances are generated in a high-temperature environment, and the use environment of the thick film heater 10 is met.
Example eight:
according to an embodiment of the invention, comprising the features defined in the above embodiment, and: the steam generator further comprises a first water pump 202 and a second water pump 204. The first pump 202 is in communication with the chamber for providing liquid into the chamber. The second water pump 204 is in communication with the chamber for pumping back liquid within the chamber.
As shown in fig. 3 and 5, in this embodiment, the steam generator further includes a first water pump 202 and a second water pump 204. The first water pump 202 is communicated with the cavity, the other end of the first water pump 202 is communicated with a water supply pipe or other water sources, and supplementary liquid can be provided into the cavity through the first water pump 202. The second water pump 204 is communicated with the cavity, the other end of the first water pump 202 is communicated with a drain pipe or other collecting devices, and liquid in the cavity can be pumped back through the second water pump 204. Through the work of controlling first water pump 202 and second water pump 204, can adjust the liquid level in the cavity, can in time moisturizing when the water level is low, can take back water when the water level is high to steam generator's effect that produces steam has been improved, the security of steam generator use has been ensured simultaneously.
Example nine:
according to a third aspect of the present invention, there is provided a control method of a steam generator, which is applied to the steam generator of the second aspect, fig. 6 shows a schematic flow chart of one aspect of the present invention, and as shown in fig. 6, the method includes:
step S602: acquiring operating parameters of an induction layer of the thick film heater;
step S604: and controlling the heating layer to be powered off according to the operation parameters, and supplementing water into the cavity.
According to the control method of the steam generator, the operation parameters of the induction layer of the thick film heater are obtained, the operation condition of the heating layer is judged according to the operation parameters, and if the current temperature is too high, the heating layer is powered off, and water is supplemented into the cavity. The burning and the film explosion of the thick film heater caused by overhigh temperature are prevented, and the running stability of the steam generator is improved.
It can be understood that, during the operation, a plurality of scales may be generated in the cavity of the steam generator for storing water, or the heat transfer performance of the surface of the thick film heater may be deteriorated, and at this time, it is necessary to prevent the thick film heater from being dried, so as to cause the burning or the explosion of the thick film. Therefore, the operation condition of the heating layer is judged according to the operation parameters by obtaining the operation parameters of the induction layer in the thick film heater, so that the heating layer is controlled to operate in a safe temperature range. If the temperature of the heating layer is too high, the heating layer is powered off, and water is supplemented into the cavity to prevent the thick film heater from being too high in temperature.
Specifically, the time of supplementing water into the cavity can be controlled, or the water is supplemented into the cavity to a preset water level through the liquid level detection module, so that the purpose of cooling and protecting the thick film heater is achieved.
Example ten:
fig. 7 shows a schematic flow chart of the present invention, and as shown in fig. 7, the induction layer of the thick film heater includes a graphite electrode layer and a silver electrode layer, and the step of controlling the power-off of the heat generating layer according to the operation parameters specifically includes:
step S702: the operation parameters comprise leakage resistance between the graphite electrode layer and the silver electrode layer, and timing is started when the leakage resistance is smaller than or equal to a preset resistance value;
step S704: and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In this embodiment, the sensing layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, the leakage resistance between the graphite electrode layer and the silver electrode layer is obtained, and the timing is started when the leakage resistance is less than or equal to a preset resistance value. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. When the leakage resistance is smaller than the preset resistance value, the temperature of the heating layer is over high, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploding due to over high temperature.
Specifically, the first duration threshold may be calculated by a technician through testing, and the preferred first duration threshold is 5S.
Example eleven:
fig. 8 shows a schematic flow chart in an embodiment of the present invention, and as shown in fig. 8, the step of controlling the power-off of the heat generating layer according to the operating parameters includes:
step S802: the operation parameters comprise leakage current between the graphite electrode layer and the silver electrode layer, and when the leakage current is greater than or equal to a preset current value, timing is started;
step S804: and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In this embodiment, the sensing layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, and the leakage current between the graphite electrode layer and the silver electrode layer is acquired, and when the leakage current is greater than or equal to a preset resistance value, the timing is started. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. When the leakage current is larger than the preset resistance value, the temperature of the heating layer is too high, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploding due to too high temperature.
Example twelve:
fig. 9 shows a schematic flowchart of a process in an embodiment of the present invention, and as shown in fig. 9, the sensing layer of the thick film heater includes a temperature sensing layer, a graphite electrode layer, and a silver electrode layer, and the step of controlling the power-off of the heat generating layer according to the operating parameters specifically includes:
step S902: the operation parameter is a temperature value of the temperature sensing layer, and when the temperature value is greater than or equal to a preset temperature value, timing is started;
step S904: and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first duration threshold.
In this embodiment, the sensing layer of the thick film heater includes the graphite electrode layer, the silver electrode layer and the sensing layer, and by obtaining the current temperature value of the sensing layer, when the temperature value is greater than or equal to the preset temperature value, timing is started. And when the accumulated timing duration is greater than or equal to the first duration threshold, controlling the heating layer to be powered off. Because the induction layer is connected with the heating layer, the temperatures of the induction layer and the heating layer are similar. When the temperature value on response layer was greater than when predetermineeing the temperature, then showed that the temperature on layer that generates heat can be too high, will generate heat the layer outage this moment, reach the effect of cooling to prevent to cause burning out and the rupture of membranes of thick film heater because the high temperature.
Specifically, the preset temperature value ranges from 150 ℃ to 250 ℃.
It is understood that the preset temperature value is in the range of 150 ℃ to 250 ℃ according to the criterion of judging whether the temperature is too high, wherein 200 ℃ is preferred. When the thick film heater is exposed to temperatures in the range of 150 c to 250 c for extended periods of time, a popping event may occur. Therefore, when the temperature of the induction layer is detected to exceed the preset temperature value, the temperature of the heating layer is indicated to exceed the preset temperature value, the heating layer is powered off at the moment, and the effect of cooling is achieved, so that the thick film heater is prevented from being burnt and exploded due to overhigh temperature.
Example thirteen:
in an embodiment of the present invention, the steam generator includes a liquid level detection module, and the control method further includes:
and acquiring a liquid level parameter of the liquid level detection module, and controlling the heating layer to be powered off and supplementing water into the cavity if the liquid level parameter is smaller than a preset liquid level value.
In this embodiment, steam generator includes the liquid level detection module, and through the liquid level parameter who obtains the liquid level detection module, if the liquid level parameter is less than preset liquid level value, the water level in the cavity of the current steam generator of surface is lower. The layer outage that generates heat is controlled this moment to moisturizing in to the cavity, thereby guarantee that the water level in the cavity is normal, prevent therefore that the cavity water-logging from burning out, cause destruction to the thick film heater, keep the normal water level in the cavity simultaneously, can also guarantee that steam generator produces steam and is not influenced.
Specifically, the preset level value may be 5mm, 8mm, 10mm or the like, and a technician may set the preset level value according to the environment and the operating power of the actual application of the steam generator.
Example fourteen:
as shown in fig. 2 to 5, a modular surface temperature control thick film steam generator is provided, which mainly comprises a surface temperature control thick film heater, a sealing silica gel ring, a boiler shell, a diaphragm water pump, a control circuit board PCB, a liquid level probe, a water cooling fin, a silica gel water pipe 22 and the like.
In the thick film heating plate, the steel plate layer 102 is preferably made of 444, 430 or 443 type steel, and the first medium layer 104, the heating wire layer 106, the second medium layer 108, the silver electrode layer 116, the temperature sensing layer 114, the graphite electrode layer 112, the cladding layer 120 and the like are sequentially printed on the steel plate. One surface of the steel plate layer 102 is in contact with heated liquid, and the other surface is a heating source. The first dielectric layer 104 functions to insulate the heating wire layer 106 from the steel plate layer 102, and has good insulation and thermal conductivity. The second dielectric layer 108 functions as an insulating electrode layer and the heater filament layer 106, and has good insulating properties and thermal conductivity. The heating wire layer 106 is a thick film heating circuit for screen printing, and transfers heat to the steel plate layer 102 and further to the heated liquid by heating, and the thickness thereof is in micron order, so that the heating wire layer has small thermal inertia.
The temperature sensing layer 114 is a core control function layer of the thick film heating plate, and is made of alkali metal oxide, glass component, functional additive, modified additive and the like according to a certain proportion, the equivalent circuit diagram of the temperature sensing layer is shown in fig. 10, the equivalent circuit diagram is formed by connecting countless small resistors in parallel, and the reduction of any one resistor can cause the reduction of the whole total resistance. By changing the components and the proportion, the resistance-temperature change characteristic can be controlled, and the function of controlling the surface temperature and preventing the dry burning phenomenon can be realized by selecting a proper proportion value, for example, as shown in a 1/R-T curve of a temperature sensing layer in figure 11, it can be seen that the 1/R value has a large change rate after the surface temperature reaches 180-200 ℃.
The sealing silica gel ring is made of food-grade silicon rubber and is mainly used for sealing between the thick film heating plate and the boiler shell. The boiler shell is made of food-grade PPS or other food-grade plastics, serves as a water storage cavity and a boiling cavity, and is mainly used for storing water and serving as a boiling container. The number of the membrane water pumps is 2, preferably 12VDC membrane water pumps, wherein the first water pump 202 is a water supply pump, the second water pump 204 is a water return pump, the water supply pump supplies water to the generator when the thick film steam generator works, and the water return pump pumps waste water in the generator back when the generator stops working. The control circuit board PCB is arranged on the upper part of the mounting position of the membrane water pump of the boiler shell and plays a role in controlling the whole modularized steam generator. The controllable silicon and temperature sensing circuit controls and adjusts the running power of the generator, and the temperature sensing circuit monitors the temperature of the heating surface to prevent dry heating. The liquid level probe is arranged at one corner of the boiler shell and plays a role of liquid level control when the generator works with the other liquid level electrode (ground wire).
The modular surface temperature control thick film steam generator has the working process that after the PCB I2C communication serial port receives a power instruction of the whole machine, the heating power of the thick film heating plate is controlled through the controlled silicon. Meanwhile, the PCB controls the diaphragm water pump to pump water through a liquid level signal detected by the liquid level probe, room temperature water is transmitted to the cavity of the thick film heater, and the room temperature water is heated by the thick film heating wire to become high temperature steam and is discharged from the gas outlet. And after the whole machine and the thick film heater stop working, the water return pump performs pumping back treatment on residual water in the generator.
In the embodiment, the anti-dry heating modularized thick film steam generator is provided and comprises an anti-dry heating thick film heating plate, a sealing silica gel ring, a boiler shell, a diaphragm water pump, a control circuit board PCB, a liquid level probe, a water cooling radiating fin, a silica gel water pipe and the like. Prevent being equipped with heater layer, temperature sensing layer, electrode layer isotructure on the dry combustion method thick film heating plate, replaced traditional thick film heater's temperature controller structure, improved prevent dry combustion method region scope, the temperature on heater plate surface can be monitored in the work operation process, improves the fail safe nature of whole module operation.
In the working process of the steam generator, if scale accumulation in the generator is excessive, or boiling surface boiling heat transfer is deteriorated, or other impurities exist on the surface of the thick film heating plate to cause heat transfer deterioration, the thick film circuit starts an anti-dry heating control algorithm to prevent the heating film from being burnt.
As shown in fig. 12, an algorithm for controlling dry burning prevention of a thick film circuit is provided, wherein when the value of leakage current or resistance between two electrode layers is detected to exceed a set threshold value and the duration time exceeds a set threshold value, the dry burning phenomenon is determined to occur, and then the operation is immediately performed to prevent the heating film from being burnt.
The judgment threshold of the temperature signal corresponding to the leakage current or the resistance is 150-250 ℃, preferably 200 ℃, that is, when the temperature signal corresponding to the leakage current between the two electrode layers exceeds 200 ℃, the anti-dry heating protection is triggered to start timing.
The set time threshold is 0-20s, the judgment accuracy of the dry burning prevention algorithm and the temperature resistance safety of the thick film element are considered, the time threshold is preferably 5s, namely when the temperature signal corresponding to the leakage current between the two electrode layers exceeds 200 ℃ for 5s continuously, the dry burning prevention protection program is triggered, the thick film circuit is powered off, and the water pump continues to replenish water for 10s to cool. And then continues to operate until the end.
The invention designs an anti-dry heating control algorithm on the basis of the anti-dry heating surface temperature-controlled thick diaphragm plate, and the specific control method comprises the following steps: when the temperature signal corresponding to the leakage current between the two electrode layers exceeds 200 ℃ and lasts for 5s, the dry burning prevention protection program is triggered, the thick film circuit is powered off, and the water pump continues to supplement water for 10s to cool. Before the thick film plate is subjected to dry burning and film explosion, the action protection is carried out in advance, so that the dry burning prevention effect is achieved.
Further, FIG. 13 shows one embodiment of a dry-fire test of a thick film heater during normal operation at a power of 800W. FIG. 14 shows one embodiment of a dry-fire test of a thick film heater in normal operation at 1700W. FIG. 15 shows one embodiment of a dry-fire test of a thick film heater in the 800W tilted state. FIG. 16 shows one embodiment of a dry-fire test of a thick film heater at a 1700W tilt. Through the four specific embodiments, it can be seen that the circle is a node where dry burning occurs, so that power is cut off and water is supplemented in time through an anti-dry burning algorithm, and the phenomenon that the thick film heater burns out or a film is exploded is avoided.
Example fifteen:
according to a fourth aspect of the present invention, there is provided a computer readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implements the steps of the control method of the steam generator according to any one of the above third aspects, thereby achieving all the technical effects of the control method of the steam generator, which will not be described herein again.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A thick film heater, comprising:
the heating layer is used for providing a heat source;
the induction layer is used for controlling the heating layer;
the coating layer is used for protecting the induction layer and the heating layer;
wherein, the induction layer is arranged between the heating layer and the coating layer.
2. The thick film heater of claim 1, wherein the sensing layer comprises:
a graphite electrode layer;
a temperature sensing layer;
a silver electrode layer;
the temperature sensing layer is arranged between the graphite electrode layer and the silver electrode layer, the silver electrode layer is connected with the heating layer, and the silver electrode layer is connected with the coating layer.
3. A steam generator, comprising:
the thick film heater of claim 1 or 2;
a housing forming a cavity with the thick film heater;
and the control circuit module is connected with the thick film heater and used for controlling the operation of the thick film heater, and the control circuit module is arranged on the shell.
4. The steam generator of claim 3, wherein the control circuit module comprises:
the power control module is connected with the heating layer and is used for controlling the working power of the heating layer;
the parameter detection module is connected with the induction layer and is used for detecting the operation data of the induction layer.
5. The steam generator of claim 4, further comprising:
and the heat dissipation module is connected with the power control module and is used for dissipating heat of the power control module.
6. The steam generator of claim 3, further comprising:
the liquid level detection module is arranged in the cavity.
7. The steam generator of claim 3, further comprising:
a sealing member for sealing connection of the thick film heater and the housing.
8. The steam generator of claim 3, further comprising:
the first water pump is communicated with the cavity and is used for providing liquid into the cavity;
and the second water pump is communicated with the cavity and is used for pumping liquid in the cavity back.
9. A control method of a steam generator adapted to the steam generator according to any one of claims 3 to 8, characterized by comprising:
acquiring operating parameters of an induction layer of the thick film heater;
and controlling the heating layer to be powered off according to the operating parameters, and supplementing water into the cavity.
10. The method for controlling the steam generator according to claim 9, wherein the sensing layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, and the step of controlling the power-off of the heat generating layer according to the operating parameters specifically comprises:
the operation parameters comprise leakage resistance between the graphite electrode layer and the silver electrode layer, and timing is started when the leakage resistance is smaller than or equal to a preset resistance value;
and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first time duration threshold.
11. The method for controlling the steam generator according to claim 9, wherein the sensing layer of the thick film heater comprises a graphite electrode layer and a silver electrode layer, and the step of controlling the power-off of the heat generating layer according to the operating parameters specifically comprises:
the operation parameters comprise leakage current between the graphite electrode layer and the silver electrode layer, and when the leakage current is larger than or equal to a preset current value, timing is started;
and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first time duration threshold.
12. The method for controlling the steam generator according to claim 9, wherein the sensing layer of the thick film heater comprises a temperature sensing layer, a graphite electrode layer and a silver electrode layer, and the step of controlling the power-off of the heat generating layer according to the operation parameter comprises:
the operation parameter is a temperature value of the temperature sensing layer, and when the temperature value is greater than or equal to a preset temperature value, timing is started;
and controlling the heating layer to be powered off based on the timing duration being greater than or equal to the first time duration threshold.
13. The control method of the steam generator according to claim 12, wherein the preset temperature value ranges from 150 ℃ to 250 ℃.
14. The control method of the steam generator according to claim 9, wherein the steam generator includes a liquid level detection module, the control method further comprising:
and acquiring the liquid level parameter of the liquid level detection module, and if the liquid level parameter is smaller than a preset liquid level value, controlling the heating layer to be powered off and supplementing water into the cavity.
15. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the control method of a steam generator according to any one of claims 9 to 14.
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| AT508785A4 (en) * | 2010-01-11 | 2011-04-15 | Wiedlroither Johann | DEVICE FOR HEATING A FLUID |
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| WO2018082137A1 (en) * | 2016-11-02 | 2018-05-11 | 佛山市顺德区美的电热电器制造有限公司 | Electric rice cooker and control method thereof |
| CN209499498U (en) * | 2018-05-25 | 2019-10-18 | 广东美的厨房电器制造有限公司 | Steam generator and steam cooking apparatus |
| CN110636648A (en) * | 2019-09-16 | 2019-12-31 | 广东美的白色家电技术创新中心有限公司 | Thick film heater and steam generator |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT508785A4 (en) * | 2010-01-11 | 2011-04-15 | Wiedlroither Johann | DEVICE FOR HEATING A FLUID |
| CN107315427A (en) * | 2016-04-27 | 2017-11-03 | 宁波格林美孚新材料科技有限公司 | A kind of steam generator control system |
| WO2018082137A1 (en) * | 2016-11-02 | 2018-05-11 | 佛山市顺德区美的电热电器制造有限公司 | Electric rice cooker and control method thereof |
| CN209499498U (en) * | 2018-05-25 | 2019-10-18 | 广东美的厨房电器制造有限公司 | Steam generator and steam cooking apparatus |
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