Steam generation control method, steam generation control system, and extractor hood

Abstract

The present application relates to a steam generation control method, a steam generation control system and a range hood. The steam generation control method comprises the steps of: starting a water pump to run for a preset water replenishment time to replenish water for a heater; detecting a body temperature of the heater in real time through a temperature sensor to obtain an initial water temperature before the heater is operated; operating the heater to preheat based on a set first preheating protection time and obtaining a heating temperature in real time after the heater is operated; determining whether the heating temperature is greater than or equal to a preset heating temperature threshold; if yes, directly intermittently operating the water pump; if no, intermittently operating the water pump only when a running time of the heater reaches the first preheating protection time; resetting the first preheating protection time to a preset reset time; and determining whether steam soaking is completed to return to the step of determining whether the heating temperature is greater than the preset heating temperature threshold when the steam soaking is not completed.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a steam generation control method, a steam generation control system, and a range hood. Background Technology

[0002] With the improvement of people's living standards, range hoods have become an indispensable kitchen appliance in modern homes. They are typically installed above the stove to extract cooking fumes, thereby purifying the kitchen environment and improving cooking comfort. To achieve self-cleaning in range hoods, steam generators are widely used. The basic principle is that the steam generator produces steam, which is then rapidly sprayed out at the nozzles to flush the impeller and / or volute, thus achieving self-cleaning.

[0003] Currently, there are two main ways to generate steam in existing steam generators: the first is to use a small-flow electromagnetic pump to supply water to the heater to generate steam. Since the heater has sufficient power and the electromagnetic pump has a small flow rate, steam can be generated even if water is continuously supplied. The second is to use a large-flow water pump to supply water to the heater to generate steam. Since the water pump has a large flow rate, water needs to be supplied intermittently (e.g., water is supplied for b seconds and then stopped for c seconds) in order to reduce the amount of water to generate steam.

[0004] However, the first steam generation method not only fails to achieve hot water cleaning due to its low flow rate, but even when hot water is used, the impact force is insufficient to remove grease. Furthermore, the constant heating and water supply parameters lead to steam generation problems when there are significant differences in the water temperature. For example, when the water temperature is too low, steam generation is weak or even nonexistent; when the water temperature is too high, the excessively high steam temperature causes frequent temperature control disconnections, resulting in intermittent steam and affecting the system's lifespan. The second steam generation method, using timed intermittent water supply, can only guarantee continuous and stable steam when the water temperature is within a certain range. Due to the large temperature difference between winter and summer, steam generation weakens or even ceases in winter, easily leading to intermittent steam problems. Summary of the Invention

[0005] To address the problem that existing steam generators often experience weak or even non-existent steam generation when there is a large temperature difference between winter and summer water supply, resulting in intermittent steam production, this application provides a steam generation control method, a steam generation control system, and a range hood, which can ensure continuous and stable steam output and achieve highly consistent steam generation.

[0006] To achieve at least one of the above-mentioned advantages or other benefits and objectives of the present invention, the present invention provides a steam generation control method, comprising the steps of:

[0007] Start the water pump and run it for the preset water replenishment time to replenish water to the heater;

[0008] The temperature of the heater body is detected in real time by a temperature sensor to obtain the initial water temperature before the heater is put into operation.

[0009] Based on the set first preheating protection time, the heater is run to preheat, and the heating temperature is obtained in real time after the heater is running;

[0010] Determine whether the heating temperature is greater than or equal to a preset heating temperature threshold: if yes, then the water pump runs intermittently; if not, the water pump only runs intermittently when the heater's operating time reaches the first preheating protection time; and

[0011] The first preheating protection time is reset to a preset reset time, and it is determined whether steam immersion is complete. If steam immersion is not complete, the process returns to the step of determining whether the heating temperature is greater than the preset heating temperature threshold.

[0012] According to one embodiment of this application, the step of determining whether the heating temperature is greater than a preset heating temperature threshold includes the following steps:

[0013] The heating temperature is compared with the preset heating temperature threshold.

[0014] In response to the heating temperature being greater than or equal to the preset heating temperature threshold, the water pump is first started to run for a preset water pump running time, and then the water pump is turned off for a preset water pump interval time.

[0015] In response to the heating temperature being lower than the preset heating temperature threshold, it is determined whether the operating time of the heater has reached the first preheating protection time;

[0016] In response to the heater's operating time not reaching the first preheating protection time, the process returns to the step of comparing the heating temperature with the preset heating temperature threshold; and

[0017] In response to the heater's operating time reaching the first preheating protection time, the water pump is first started to run for a preset water pump operating time, and then the water pump is shut down for a preset water pump interval time.

[0018] According to one embodiment of this application, the pump running time satisfies the following relationship: V / 3Q≤b≤V / 4Q; where: b is the pump running time; V is the cavity volume of the heater; and Q is the pump flow rate.

[0019] According to one embodiment of this application, the first preheating protection time satisfies the following relationship: t1 = 630V / P + 10; where: t1 is the first preheating protection time; V is the cavity volume of the heater; and P is the power of the heater.

[0020] According to one embodiment of this application, the preset reset time satisfies the following relationship: t0 = 105b × Q / P + 3; where: t0 is the preset reset time; b is the running time of the water pump; Q is the flow rate of the water pump; and P is the power of the heater.

[0021] According to one embodiment of this application, between the steps of detecting the body temperature of the heater in real time using a temperature sensor to obtain an initial water temperature before the heater starts operating and the steps of running the heater for preheating based on a set first preheating protection time and obtaining the heating temperature in real time after the heater starts operating, the following step is further included:

[0022] Determine whether the initial water temperature is greater than the first preset water temperature threshold: if so, calculate the first water pump interval time based on the initial water temperature using the first water pump operation interval model as the preset water pump interval time; if not, calculate the second water pump interval time using the second water pump operation interval model as the preset water pump interval time.

[0023] According to one embodiment of this application, the intermittent operation model of the first water pump is the following formula: c1=[(682.5-5.25T0)×Q / P-1]×b+0.5; where: c1 is the intermittent time of the first water pump; T0 is the initial water temperature; Q is the flow rate of the water pump; P is the power of the heater; b is the operating time of the water pump;

[0024] The intermittent operation model of the second water pump is: c2=(525Q / P-1)×b+0.5; where: c2 is the intermittent time of the second water pump; Q is the flow rate of the water pump; P is the power of the heater; b is the operating time of the water pump.

[0025] According to one embodiment of this application, the steps further include:

[0026] In response to the completion of steam immersion, it is determined whether the initial water temperature is greater than or equal to the second preset water temperature threshold: if yes, the heater is turned off and the water pump is continuously run until the hot water rinsing is completed; if no, the water pump is directly and continuously run until the hot water rinsing is completed.

[0027] According to one embodiment of this application, between the step of starting the water pump to run for a preset water replenishment time to replenish the heater and the step of detecting the heater body temperature in real time by a temperature sensor to obtain the initial water temperature before the heater starts running, the following step is further included:

[0028] Determine if the temperature sensor is faulty: if so, directly run the heater for preheating, and after the preset second preheating protection time, intermittently run the water pump until steam immersion is completed; if not, perform the step of using the temperature sensor to detect the body temperature of the heater in real time to obtain the initial water temperature before the heater is run.

[0029] According to one embodiment of this application, the second preheating protection time satisfies the following relationship: t2 = 551.25V / P; where: t2 is the second preheating protection time; V is the cavity volume of the heater; and P is the power of the heater.

[0030] According to one embodiment of this application, when the water pump is intermittently operated after a preset second preheating protection time, the water pump is first started to run for a preset water pump operating time, and then the water pump is turned off to intermittently run for a third water pump intermittent time; the third water pump intermittent time satisfies the following relationship: c3=(551.25Q / P-1)×b; where: c3 is the third water pump intermittent time; Q is the water pump flow rate; P is the heater power; and b is the water pump operating time.

[0031] According to another aspect of this application, one embodiment of this application further provides a steam generation control system, including:

[0032] A steam generator, comprising a heater, a water pump connected to the inlet of the heater, and a temperature sensor mounted on the heater for detecting the temperature of the heater body; and

[0033] The control module is communicatively connected to the heater, the water pump, and the temperature sensor, and is used to execute the steps in any of the steam generation control methods described above.

[0034] According to another aspect of this application, one embodiment of this application further provides a range hood, including:

[0035] The range hood body; and

[0036] The aforementioned steam generation control system is installed on the range hood body and is used to generate steam to clean the impeller and / or volute of the range hood body.

[0037] In summary, the steam generation control method of this application first operates the heater for preheating, and then intermittently operates the water pump to supply water after the heating temperature reaches a preset heating temperature threshold. This ensures the purity of the steam and the continuity of steam generation when the initial water temperature is low. Furthermore, the water pump operates for a time b before stopping for an intermittent time c, allowing steam to be generated and ejected, ensuring continuous steam generation. Simultaneously, it also ensures uniform heat distribution from the heater, guaranteeing more accurate temperature detection by the temperature sensor and preventing system malfunctions due to detection delays, thus solving the problem of continuous water spraying. Attached Figure Description

[0038] Figure 1 This is a schematic flowchart of a steam generation control method according to an embodiment of the present invention;

[0039] Figure 2 An example of a heating temperature determination step in the steam generation control method according to the above embodiments of this application is shown;

[0040] Figure 3 A first modified embodiment of the steam generation control method according to the above embodiments of this application is shown;

[0041] Figure 4 A second modified embodiment of the steam generation control method according to the above embodiments of this application is shown;

[0042] Figure 5 This is a block diagram of a steam generation control system according to an embodiment of this application;

[0043] Figure 6 This is a block diagram of a range hood according to an embodiment of this application;

[0044] Figure 7 An example of a control process for a range hood in self-cleaning according to the above embodiments of this application is shown.

[0045] Explanation of key component symbols:

[0046] 1. Range hood; 10. Steam generation control system; 11. Steam generator; 111. Heater; 112. Water pump; 113. Temperature sensor; 12. Control module; 20. Range hood body.

[0047] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0048] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] Considering that existing steam generation methods often result in weak or even no steam generation when the water temperature is low due to constant heating and water supply parameters, leading to intermittent steam production, this application provides a steam generation control method, a steam generation control system, and a range hood that can ensure continuous and stable steam output, achieving highly consistent steam generation.

[0052] Specifically, according to another aspect of this application, such as Figure 1 As shown, one embodiment of this application provides a steam generation control method, which may include the following steps:

[0053] S100: Start the water pump and run it for a preset water replenishment time to replenish water to the heater;

[0054] S200: The temperature of the heater body is detected in real time by a temperature sensor to obtain the initial water temperature before the heater is started;

[0055] S300: Based on the set first preheating protection time, the heater is run to preheat, and the heating temperature is obtained in real time after the heater is running;

[0056] S400: Determine whether the heating temperature is greater than or equal to a preset heating temperature threshold: if yes, then the water pump runs intermittently; if no, then the water pump runs intermittently only when the heater's operating time reaches the first preheating protection time; and

[0057] S500: Reset the first preheating protection time to the preset reset time, and determine whether steam soaking is complete, so as to return to step S400 if steam soaking is not complete.

[0058] It is worth noting that the steam generation control method of this application first stops the water pump after a preset water replenishment time to replenish water to the heater, thus preventing the heater from burning dry during subsequent heating processes, which would reduce its lifespan or cause malfunctions. It is understood that the preset water replenishment time mentioned in this application is generally the time required to fill the heater with water, which can be determined based on factors such as the length of the water replenishment pipeline, the volume V of the heater cavity, and the flow rate Q of the water pump; this application will not elaborate on these factors further.

[0059] Furthermore, although the temperature sensor in this application is used to detect the temperature of the heater body in real time, rather than directly detecting the water temperature, the heater temperature detected by the temperature sensor before the heater starts operating is essentially equal to the water temperature, thus obtaining the initial water temperature. Therefore, the steam generation control method of this application first runs the heater for preheating, and then intermittently runs the water pump to supply water after the heating temperature reaches a preset heating temperature threshold. This ensures the purity of the steam and the continuity of steam generation when the initial water temperature is low. Additionally, the water pump first runs for a time b, then stops for an intermittent time c, allowing steam to be generated and ejected, ensuring continuous steam generation. Simultaneously, it also allows the heat from the heater to be evenly distributed, ensuring more accurate temperature detection by the temperature sensor, avoiding system malfunctions due to detection delays, and solving the problem of continuous water spraying.

[0060] Optionally, the preset heating temperature threshold mentioned in this application is between 120°C and 140°C. Preferably, the preset heating temperature threshold is implemented as 130°C to ensure that the generated steam has high purity.

[0061] It is worth noting that the first preheating protection time t1 mentioned in this application is to avoid overheating caused by faults such as the temperature sensor being able to measure the temperature but the measured temperature showing a large discrepancy. Therefore, this first preheating protection time is a protective measure, and its value can be determined according to the operating conditions during the coldest winter months. Under normal circumstances, the heating temperature detected by the temperature sensor is used to determine the trigger, and the first preheating protection time is only used to trigger the protection in case of a fault. Optionally, the first preheating protection time t1 satisfies the following relationship: t1 = 630V / P + 10; where: V is the cavity volume of the heater; P is the power of the heater. Preferably, the first preheating protection time t1 can be between 25 seconds and 30 seconds.

[0062] More specifically, such as Figure 2 As shown, step S400 in the steam generation control method of this application may include the following steps:

[0063] S410: Compare the heating temperature with the preset heating temperature threshold;

[0064] S420: In response to the heating temperature being greater than or equal to the preset heating temperature threshold, the water pump is first started to run for a preset water pump running time, and then the water pump is turned off for a preset water pump interval time.

[0065] S430: In response to the heating temperature being lower than the preset heating temperature threshold, determine whether the operating time of the heater has reached the first preheating protection time;

[0066] S440: In response to the heater's operating time not reaching the first preheating protection time, return to step S410; and

[0067] S450: In response to the heater's operating time reaching the first preheating protection time, the water pump is first started to run for a preset water pump operating time, and then the water pump is shut off for a preset water pump interval time.

[0068] Thus, the steam generation control method of this application adopts temperature control during the preheating stage, resulting in high steam stability and consistency. At the same time, compared with timed control, temperature control can avoid the problem of unstable steam caused by differences in water temperature added by the user, and solve the problem of weak steam in winter and strong steam in summer during winter and summer use.

[0069] It is worth noting that the pump running time b mentioned in this application can be determined by the cavity volume V of the heater, that is, ensuring that the steam outlet of the steam generator will not spray water jets after water enters for b seconds.

[0070] Optionally, the pump operating time b satisfies the following relationship: V / 3Q ≤ b ≤ V / 4Q; where V is the volume of the heater cavity and Q is the pump flow rate. In other words, the single water replenishment volume in this application is typically between 1 / 3 and 1 / 4 of the heater cavity volume V, so as to effectively ensure stable steam generation while avoiding water jets at the steam outlet, thus helping to improve steam purity.

[0071] Furthermore, the pump intermittent time 'c' mentioned in this application is typically determined based on the water temperature conditions in summer to ensure sufficient steam output during the summer. This time also serves as the reaction time of the temperature sensor; therefore, the pump intermittent time 'c' must not be less than the temperature sensor's reaction time and must not exceed the high-intensity steam output time in summer. Thus, in summer when the water temperature is high, after b seconds of water intake, the heating temperature detected by the temperature sensor after c seconds will usually still be higher than the preset heating temperature threshold. The pump will then intermittently run repeatedly, ensuring a continuous and stable generation of steam until steam immersion is complete. In winter when the water temperature is low, after b seconds of water intake, the heating temperature detected by the temperature sensor after c seconds may be lower than the preset heating temperature threshold. In this case, the heater will continue heating, and the pump will remain off for the preset reset time without intake until the heating temperature exceeds the preset heating temperature threshold. Only then will the pump intermittently run again, ensuring steam output even in winter. This solves the problem of unstable steam caused by water temperature differences or seasonal variations, preventing reduced or absent steam output in winter.

[0072] It is worth noting that the sum of the preset reset time t0 mentioned in this application and the pump intermittent time c (i.e., t0 + c) should be greater than the steam shutdown time during the coldest winter. Optionally, the preset reset time t0 satisfies the following relationship: t0 = 105b × Q / P + 3; where: b is the pump running time; Q is the pump flow rate; and P is the heater power. Preferably, the preset reset time is implemented as 6 seconds. It is understood that the units of the pump intermittent time c and the pump running time b mentioned in this application are both seconds (s).

[0073] Furthermore, although users typically add room temperature water / tap water as required under normal circumstances, in special situations, users may add hot water / boiling water instead, leading to excessive steam, frequent on / off cycles of the thermostat, and other issues that affect its lifespan. To ensure normal operation and stable steam output even after the user has heated / boiled water, the steam generation control method in the first modified embodiment of this application differs from the embodiments described above in this application in that: Figure 3 As shown, between step S200 and step S300, the following steps may be further included:

[0074] S700: Determine whether the initial water temperature is greater than a first preset water temperature threshold: if yes, then based on the initial water temperature, calculate the first water pump intermittent time using a first water pump operation intermittent model as the preset water pump intermittent time; if no, then calculate the second water pump intermittent time using a second water pump operation intermittent model as the preset water pump intermittent time. It is understood that the first water pump operation intermittent model mentioned in this application is related to the initial water temperature, while the second water pump operation intermittent model mentioned in this application is unrelated to the initial water temperature.

[0075] For example, the intermittent operation model of the first water pump can be implemented as the following relationship:

[0076] c1=[(682.5-5.25T0)×Q / P-1]×b+0.5;

[0077] In the formula: c1 is the intermittent time of the first water pump; T0 is the initial water temperature; Q is the flow rate of the water pump; P is the power of the heater; b is the running time of the water pump. It is understood that, as mentioned in this application, the unit of the initial water temperature T0 is degrees Celsius (°C); the unit of the water pump flow rate Q is grams per second (g / s); and the unit of the heater power P is watts (W).

[0078] Furthermore, the intermittent operation model of the second water pump can be implemented as follows:

[0079] c2 = (525Q / P - 1) × b + 0.5;

[0080] In the formula: c2 is the intermittent time of the second water pump; Q is the flow rate of the water pump; P is the power of the heater; b is the running time of the water pump.

[0081] Furthermore, the first preset water temperature threshold mentioned in this application is typically the upper limit of the water temperature of tap water or household drinking water under unheated conditions. Optionally, the first preset water temperature threshold is implemented as 35°C.

[0082] It is worth noting that the first pump intermittent time c1 calculated by the first pump operation intermittent model is less than the second pump intermittent time c2 calculated by the second pump operation intermittent model. Thus, when the initial water temperature T0 is detected to be greater than 35℃, the first pump intermittent time c1 is calculated using the first pump operation intermittent model, causing the pump to operate with short intermittent operation. That is, the pump runs for b seconds, followed by a short intermittent time c1 seconds, effectively shortening the heater's heating time and preventing issues such as excessive steam, frequent thermostat on / off cycles, and other lifespan-affecting conditions, ensuring stable steam output. Conversely, when the initial water temperature T0 is detected to be less than or equal to 35℃, the second pump intermittent time c2 is calculated using the second pump operation intermittent model, causing the pump to operate with long intermittent operation. That is, the pump runs for b seconds, followed by a longer intermittent time c2 seconds, effectively extending the heater's heating time and preventing issues such as reduced steam or no steam output.

[0083] Furthermore, when cleaning a range hood, after the steam stage is completed (i.e., steam wetting is finished), it usually enters the hot water rinsing stage to use the stronger impact of hot water to rinse the impeller or volute, thereby improving the cleaning effect. Therefore, in the above embodiments of this application, as Figure 1 As shown, the steam generation control method of this application may further include the following steps:

[0084] S600: In response to the completion of steam immersion, determine whether the initial water temperature is greater than or equal to the second preset water temperature threshold: if yes, turn off the heater and run the water pump continuously until hot water rinsing is completed; if no, run the water pump continuously until hot water rinsing is completed.

[0085] It is worth noting that the second preset water temperature threshold mentioned in this application is to ensure that the heater continues to heat without turning into steam when the water pump continuously supplies water for flushing. That is, the second preset water temperature threshold should be lower than the difference between 95°C and the temperature rise. For example, the second preset water temperature threshold can be, but is not limited to, 60°C.

[0086] Thus, when the initial water temperature T0 ≥ 60℃, the heater is turned off, and the water delivered by the water pump is used directly for a full rinse until the hot water rinse stage is completed; when the initial water temperature T0 ≤ 60℃, the heater is not turned off, so that the water delivered by the water pump is heated by the heater before a full rinse is performed; at this time, the heater will continue to heat the water without heating it to the temperature at which steam is generated, so as to ensure normal operation under a few hot water conditions.

[0087] Furthermore, since the successful operation of the steam generation control method in this application depends entirely on the detection function of the temperature sensor, a malfunction of the temperature sensor could lead to functional abnormalities or even prevent the steam generation control method from functioning properly. In such cases, compromise methods would be necessary to maintain system functionality. It is understood that while temperature sensor malfunctions typically occur towards the end of the machine's lifespan, they are extremely rare.

[0088] To address this issue, the steam generation control method of this application can employ a setpoint control approach when the temperature sensor malfunctions. In other words, compared to the embodiments described above, the difference in the second modified embodiment of this application lies in: Figure 4 As shown, between step S100 and step S200, the following step may also be included:

[0089] S800: Determine if the temperature sensor is faulty: If yes, directly run the heater for preheating, and after the preset second preheating protection time, intermittently run the water pump until steam immersion is completed; if no, proceed to step S200.

[0090] It is worth noting that the second preheating protection time t2 mentioned in this application is usually set according to the water temperature of 25°C under normal water use conditions. That is, the second preheating protection time t2 can satisfy the relationship: t2=551.25V / P; where: V is the cavity volume of the heater; P is the power of the heater.

[0091] Furthermore, in step S800: when the water pump is intermittently operated after the preset second preheating protection time, the water pump is first started to run for the preset water pump running time, and then the water pump is turned off to intermittently run for the third water pump intermittent time.

[0092] Optionally, the intermittent time c3 of the third water pump can satisfy the following formula: c3=(551.25Q / P-1)×b; where: Q is the flow rate of the water pump; P is the power of the heater; and b is the running time of the water pump. It is understood that, although the steam generation control method of this application cannot completely guarantee the consistency of steam generation when the temperature sensor malfunctions, it can ensure normal functioning. That is, steam is normal only when the water temperature is within the range of 25±5℃. This is also set considering most water temperature conditions to ensure normal functioning and meet the daily needs of most households.

[0093] It is worth mentioning that, according to another aspect of this application, such as Figure 5As shown, one embodiment of this application further provides a steam generation control system 10, which may include a steam generator 11 and a control module 12; the steam generator 11 includes a heater 111, a water pump 112 connected to the inlet of the heater 111, and a temperature sensor 113 mounted on the heater 111 and used to detect the temperature of the heater body; the control module 12 is communicatively connected to the heater 111, the water pump 112 and the temperature sensor 113, and is used to execute the steps in the above-described steam generation control method.

[0094] Alternatively, the temperature sensor 113 may be implemented as a thermistor sensor (i.e., an NTC sensor).

[0095] Furthermore, according to another aspect of this application, such as Figure 6 As shown, one embodiment of this application further provides a range hood 1, which may include a range hood body 20 and the aforementioned steam generation control system 10; the steam generation control system 10 is assembled on the range hood body 20 and is used to generate steam to clean the impeller and / or volute of the range hood body 20, so as to realize the self-cleaning function of the range hood 1.

[0096] For example, such as Figure 7 As shown, the control process of the range hood 1 when it starts self-cleaning is as follows:

[0097] S1, control the water pump to run, then proceed to S2;

[0098] S2. Determine if the water pump has been running for a seconds: if yes, proceed to S3; if no, proceed to S1.

[0099] S3. Determine if the NTC has malfunctioned: If yes, proceed to S20; if no, proceed to S4.

[0100] S4. Control the NTC to detect the initial water temperature T0, then proceed to S5;

[0101] S5. Determine if the initial water temperature T0 is greater than 35℃: If yes, proceed to S6; if no, proceed to S7.

[0102] S6. Calculate the first pump interval time c1 = [(682.5-5.25T0)×Q / P-1]×b+0.5 as the preset pump interval time c, and proceed to S8;

[0103] S7. Calculate the second pump intermittent time c2 = (525Q / P-1) × b + 0.5 as the preset pump intermittent time c, and proceed to S8;

[0104] S8, Controls heater operation;

[0105] S9. Set the first preheating protection time t1 = 25-30s and start the countdown, then proceed to S10;

[0106] S10. Determine whether the initial water temperature T0 detected by NTC is greater than or equal to 130℃: if yes, proceed to S12; if no, proceed to S11.

[0107] S11. Determine if the first preheating protection time satisfies t1 = 0: if yes, proceed to S12; if no, return to S10.

[0108] S12, Control the water pump to run, and proceed to S13;

[0109] S13. Determine if the water pump running time has reached b seconds: If yes, proceed to S14; if no, return to S12.

[0110] S14, Control the water pump to stop, and proceed to S15;

[0111] S15. Determine if the water pump intermittent time has reached c seconds: If yes, proceed to S16; if no, return to S14.

[0112] S16. Reset the first preheating protection time t1 = 6s, and proceed to S17;

[0113] S17. Determine if steam impregnation is complete: If yes, proceed to S18; if no, return to S10.

[0114] S18. Determine if the initial water temperature T0 is greater than or equal to 60℃: If yes, proceed to S19; if no, proceed to S27.

[0115] S19, Control heater to disconnect, and proceed to S27;

[0116] S20, Control the heater to operate, and proceed to S21;

[0117] S21. Set the second preheating protection time t2 = 551.25V / P, and proceed to S22;

[0118] S22, Control the water pump to run, and proceed to S23;

[0119] S23. Determine if the water pump running time has reached b seconds: If yes, proceed to S24; if no, return to S22.

[0120] S24, Control the water pump to stop, and proceed to S25;

[0121] S25. Determine if the water pump intermittent time reaches [551.25Q / P-1]b seconds: If yes, proceed to S26; if no, return to S24.

[0122] S26. Determine if steam impregnation is complete: If yes, proceed to S27; if no, return to S22.

[0123] S27. Control the water pump to run continuously and proceed to S28;

[0124] S28. Determine if the hot water rinse is complete: If yes, proceed to the next stage; if no, return to S27.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A steam generation control method, characterized in that, Including the following steps: Start the water pump and run it for the preset water replenishment time to replenish water to the heater; The temperature of the heater body is detected in real time by a temperature sensor to obtain the initial water temperature before the heater is put into operation. Based on the set first preheating protection time, the heater is run to preheat, and the heating temperature is obtained in real time after the heater is running; Determine whether the heating temperature is greater than or equal to a preset heating temperature threshold: if yes, then the water pump runs intermittently; if not, the water pump only runs intermittently when the heater's operating time reaches the first preheating protection time; and The first preheating protection time is reset to a preset reset time, and it is determined whether steam immersion is complete. If steam immersion is not complete, the process returns to the step of determining whether the heating temperature is greater than the preset heating temperature threshold.

2. The steam generation control method according to claim 1, characterized in that, The step of determining whether the heating temperature is greater than a preset heating temperature threshold includes the following steps: The heating temperature is compared with the preset heating temperature threshold. In response to the heating temperature being greater than or equal to the preset heating temperature threshold, the water pump is first started to run for a preset water pump running time, and then the water pump is turned off for a preset water pump interval time. In response to the heating temperature being lower than the preset heating temperature threshold, it is determined whether the operating time of the heater has reached the first preheating protection time; In response to the fact that the heater's operating time has not reached the first preheating protection time, the process returns to the step of comparing the heating temperature with the preset heating temperature threshold. as well as In response to the heater's operating time reaching the first preheating protection time, the water pump is first started to run for a preset water pump operating time, and then the water pump is shut down for a preset water pump interval time.

3. The steam generation control method according to claim 2, characterized in that, The pump running time satisfies the following relationship: V / 3Q≤b≤V / 4Q; where: b is the pump running time; V is the volume of the heater cavity; and Q is the pump flow rate.

4. The steam generation control method according to claim 1, characterized in that, The first preheating protection time satisfies the following relationship: t1 = 630V / P + 10; where: t1 is the first preheating protection time; V is the cavity volume of the heater; and P is the power of the heater.

5. The steam generation control method according to claim 1, characterized in that, The preset reset time satisfies the following formula: t0 = 105b × Q / P + 3; where: t0 is the preset reset time; b is the running time of the water pump; Q is the flow rate of the water pump; and P is the power of the heater.

6. The steam generation control method according to any one of claims 1 to 5, characterized in that, Between the steps of detecting the heater body temperature in real time using a temperature sensor to obtain the initial water temperature before the heater starts operating and the steps of running the heater for preheating based on a set first preheating protection time and obtaining the heating temperature in real time after the heater starts operating, the following step is also included: Determine whether the initial water temperature is greater than the first preset water temperature threshold: if so, calculate the first water pump interval time based on the initial water temperature using the first water pump operation interval model as the preset water pump interval time; if not, calculate the second water pump interval time using the second water pump operation interval model as the preset water pump interval time.

7. The steam generation control method according to claim 6, characterized in that, The intermittent operation model of the first water pump is represented by the following formula: c1=[(682.5-5.25T0)×Q / P-1]×b+0.5; where: c1 is the intermittent time of the first water pump; T0 is the initial water temperature; Q is the water pump flow rate; P is the heater power; b is the water pump running time. The intermittent operation model of the second water pump is: c2=(525Q / P-1)×b+0.5; where: c2 is the intermittent time of the second water pump; Q is the flow rate of the water pump; P is the power of the heater; b is the operating time of the water pump.

8. The steam generation control method according to any one of claims 1 to 5, characterized in that, Further steps include: In response to the completion of steam immersion, it is determined whether the initial water temperature is greater than or equal to the second preset water temperature threshold: if yes, the heater is turned off and the water pump is continuously run until the hot water rinsing is completed; if no, the water pump is directly and continuously run until the hot water rinsing is completed.

9. The steam generation control method according to any one of claims 1 to 5, characterized in that, Between the step of starting the water pump for a preset water replenishment time to replenish the heater and the step of using a temperature sensor to detect the heater's body temperature in real time to obtain the initial water temperature before the heater starts operating, the following step is also included: Determine if the temperature sensor is faulty: if so, directly run the heater for preheating, and after the preset second preheating protection time, intermittently run the water pump until steam immersion is completed; if not, perform the step of using the temperature sensor to detect the body temperature of the heater in real time to obtain the initial water temperature before the heater is run.

10. The steam generation control method according to claim 9, characterized in that, The second preheating protection time satisfies the following relationship: t2 = 551.25V / P; where: t2 is the second preheating protection time; V is the cavity volume of the heater; and P is the power of the heater.

11. The steam generation control method according to claim 9, characterized in that, When the water pump is intermittently operated after the preset second preheating protection time, the water pump is first started to run for the preset water pump running time, and then the water pump is turned off to intermittently run for the third water pump intermittent time; the third water pump intermittent time satisfies the following relationship: c3=(551.25Q / P-1)×b; where: c3 is the third water pump intermittent time; Q is the water pump flow rate; P is the heater power; b is the water pump running time.

12. A steam generation control system, characterized in that, include: A steam generator includes a heater, a water pump connected to the inlet of the heater, and a temperature sensor mounted on the heater for detecting the temperature of the heater body. and A control module, communicatively connected to the heater, the water pump, and the temperature sensor, is used to perform the steps in the steam generation control method as described in any one of claims 1 to 11.

13. A range hood, characterized in that, include: The range hood itself; and The steam generation control system as described in claim 12 is assembled into the range hood body for generating steam to clean the impeller and / or volute of the range hood body.

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