Method and apparatus for dryer low water control, dryer, storage medium

Abstract

The application relates to the drying technical field and discloses a method for water shortage control of a dryer, which comprises the following steps: acquiring the absolute difference value of the wet bulb temperatures of upper and lower shelves; if the absolute difference value is greater than a first preset difference value, outputting a first warning prompt; if the absolute difference value is less than or equal to the first preset difference value, acquiring the real-time difference value of the wet and dry bulb temperatures of the upper and lower shelves in a drying room; and in the case that the real-time difference value of the upper and lower shelves is less than a second preset difference value and greater than a third preset difference value, outputting a second warning prompt. The method can discover the water shortage condition of the wet bulb temperature sensor in time through the judgment of two groups of parameters. The application further discloses a device for water shortage control of a dryer, a dryer and a storage medium.

Description

Technical Field

[0001] This application relates to the field of drying technology, such as a method, apparatus, dryer, and storage medium for controlling water shortage in a dryer. Background Technology

[0002] Currently, dryers need to continuously monitor the dry-bulb and wet-bulb temperatures within the drying chamber during material drying. The wet-bulb temperature refers to the relative humidity detected by a sealed temperature sensor filled with water. During the drying process, the water in the wet-bulb temperature sensor often dries up. This causes the wet-bulb temperature to fail to accurately reflect the actual relative humidity within the drying chamber, leading to drying failure.

[0003] Related technologies disclose drying equipment, including a first temperature detection module for detecting a first temperature T1 at a first position in the baking chamber; a second temperature sensor for detecting a second temperature T2 at a second position in the baking chamber; and a control module for acquiring abnormal states of the first and second temperature detection modules and for calculating temperature control parameters of the drying equipment.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The relevant technology does not explain how to determine if the temperature detection module is short of water, which may lead to delayed detection of water shortage and affect the baking effect.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a method, apparatus, dryer, and storage medium for controlling water shortage in a dryer, so as to detect the water shortage status of a temperature detection module in a timely manner.

[0009] In some embodiments, the method includes: obtaining the absolute difference between the wet-bulb temperatures of the upper and lower racks; if the absolute difference is greater than a first preset difference, outputting a first warning message; if the absolute difference is less than or equal to the first preset difference, obtaining the real-time difference between the wet-bulb and dry-bulb temperatures of the upper and lower racks in the drying room; and outputting a second warning message if the real-time difference between the upper rack and / or the lower rack is less than or equal to a second preset difference.

[0010] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to, when executing the program instructions, perform the aforementioned method for controlling water shortage in a dryer.

[0011] In some embodiments, the dryer includes: a dryer body; and a device for controlling dryer water shortage as described above, which is installed on the dryer body.

[0012] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling water shortage in a dryer.

[0013] The method, apparatus, dryer, and storage medium for controlling water shortage in a dryer provided in this disclosure can achieve the following technical effects:

[0014] In this embodiment, the presence or absence of water in the wet-bulb temperature sensor is determined by judging the absolute difference between the wet-bulb temperatures of the upper and lower shelves. Under normal circumstances, the humidity and temperature differences between the upper and lower shelves are small. If the absolute difference increases, it indicates that one of the wet-bulb temperature sensors is short of water. When the temperature difference is small, the differences between the dry and wet bulb temperatures of the upper and lower shelves are compared separately. If the dry-wet bulb difference meets certain conditions, it is determined that the wet-bulb temperature sensor is short of water. This avoids the situation where both the upper and lower humidity and temperature sensors fail simultaneously, preventing timely output of a warning based on their absolute difference. Thus, by judging two sets of parameters, the water shortage of the wet-bulb temperature sensor can be detected promptly.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a schematic diagram of a method for controlling water shortage in a dryer provided in an embodiment of this disclosure;

[0018] Figure 2 This is a schematic diagram of another method for controlling water shortage in a dryer provided in an embodiment of this disclosure;

[0019] Figure 3 This is a schematic diagram of another method for controlling water shortage in a dryer provided in an embodiment of this disclosure;

[0020] Figure 4This is a schematic diagram of another method for controlling water shortage in a dryer provided in an embodiment of this disclosure;

[0021] Figure 5 This is a schematic diagram of a device for controlling water shortage in a dryer provided in an embodiment of this disclosure;

[0022] Figure 6 This is a schematic diagram of a dryer provided in an embodiment of this disclosure. Detailed Implementation

[0023] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0024] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0025] Unless otherwise stated, the term "multiple" means two or more.

[0026] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0027] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0028] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0029] Combination Figure 1 As shown in the embodiments of this disclosure, a method for controlling water shortage in a dryer is provided, comprising:

[0030] S101, the processor obtains the absolute difference between the wet-bulb temperatures of the upper and lower chambers.

[0031] S102, if the absolute difference is greater than the first preset difference, the processor outputs the first warning message.

[0032] S103, if the absolute difference is less than or equal to the first preset difference, the processor obtains the real-time difference between the dry and wet bulb temperatures of the upper and lower racks in the drying room.

[0033] S104, if the real-time difference between the upper shelf and / or the lower shelf is less than or equal to the second preset difference, the processor outputs a second warning message.

[0034] Typically, a drying chamber is equipped with wet-bulb temperature sensors and dry-bulb temperature sensors in the upper and lower sections, respectively, to detect the relative humidity and temperature in the upper and lower sections. Under normal conditions, the wet-bulb temperature sensors in the upper and lower sections will display essentially the same readings. Therefore, if either wet-bulb sensor is dehydrated, the readings from the upper and lower sections will differ. Thus, by obtaining the absolute difference in the wet-bulb temperatures between the upper and lower sections, it can be determined whether a wet-bulb temperature sensor is dehydrated. This allows for early detection of dehydration in the initial stages of a wet-bulb temperature sensor dehydration.

[0035] However, when both the upper and lower wet-bulb temperature sensors are simultaneously dehydrated, the absolute difference between them cannot accurately determine whether a wet-bulb temperature sensor is dehydrated. In this case, the difference between the wet-bulb and dry-bulb temperature sensor readings of the upper and lower shelves is obtained. The dehydration status of each sensor is then determined. Specifically, a second preset difference is set. Normally, the difference between the wet-bulb and dry-bulb temperatures is large. If the wet-bulb temperature sensor is dehydrated, its reading will gradually approach that of the dry-bulb temperature sensor. Therefore, if the difference between the wet-bulb and dry-bulb temperature sensor readings is less than or equal to the second preset difference, it indicates that the wet-bulb temperature sensor is dehydrated. A warning message is output, which can accurately indicate a dehydrated wet-bulb sensor. For example, if the real-time difference of the upper shelf is small, a warning message is output indicating a dehydrated upper-shelf wet-bulb temperature sensor. If the real-time difference of the lower shelf is small, a warning message is output indicating a dehydrated lower-shelf wet-bulb temperature sensor. If the real-time differences of both the upper and lower shelves are small, a warning message is output indicating a dehydrated upper-shelf and lower-shelf wet-bulb temperature sensor. This can compensate for the inability to detect when both the upper and lower wet-bulb temperature sensors are simultaneously lacking water, thus enabling timely detection of water shortage in the wet-bulb temperature sensors.

[0036] The method for controlling water shortage in a dryer, as provided in this embodiment, determines whether the wet-bulb temperature sensor is short of water by judging the absolute difference between the wet-bulb temperatures of the upper and lower shelves. Under normal circumstances, the humidity and temperature difference between the upper and lower shelves is small. If the absolute difference increases, it indicates that one of the wet-bulb temperature sensors is short of water. When the temperature difference is small, the dry-bulb and wet-bulb temperature differences of the upper and lower shelves are compared separately. When the dry-bulb and wet-bulb temperature differences meet certain conditions, it is determined that the wet-bulb temperature sensor is short of water. This avoids the situation where both the upper and lower humidity and temperature sensors fail simultaneously, preventing timely output of a prompt based on the absolute difference between them. Thus, by judging two sets of parameters, the water shortage of the wet-bulb temperature sensor can be detected promptly.

[0037] Optionally, in step S104, the second preset difference is determined in the following way:

[0038] The processor obtains the target dry-bulb temperature and target wet-bulb temperature for the current drying stage.

[0039] The processor uses the difference between the target dry-bulb temperature and the target wet-bulb temperature as the second preset difference.

[0040] Here, a second preset difference is determined based on the target dry-bulb temperature and target wet-bulb temperature of the material at the current drying stage. This allows for timely detection of moisture shortage when the actual wet-bulb temperature deviates from the target wet-bulb temperature. Furthermore, the drying process generally consists of a heating stage and a dehumidification stage, each with different requirements for indoor temperature and humidity. Therefore, the target dry-bulb temperature and target wet-bulb temperature for the current drying stage are obtained. In some embodiments, the second preset difference can also be set based on empirical values.

[0041] Optionally, in step S102, the processor outputs a first warning message, including:

[0042] If the wet-bulb temperature of the upper chamber is higher than that of the lower chamber, the processor will output a warning message indicating that the upper chamber wet-bulb is low on water.

[0043] If the wet-bulb temperature of the upper chamber is lower than that of the lower chamber, the processor will output a warning message indicating that the lower chamber wet-bulb is low on water.

[0044] Here, when the absolute difference in wet-bulb temperatures between the upper and lower shelves indicates a lack of water in the wet-bulb temperature sensor, it's possible to further determine whether the sensor on the upper shelf or the lower shelf is lacking water. Specifically, the upper and lower wet-bulb temperatures are compared. If the upper wet-bulb temperature is greater than the lower wet-bulb temperature, it indicates that the upper wet-bulb temperature sensor is lacking water. If the upper wet-bulb temperature is less than the lower wet-bulb temperature, it indicates that the lower wet-bulb temperature sensor is lacking water. In this way, when a wet-bulb sensor is lacking water, not only can a timely alert be provided, but the sensor with the lack of water can also be accurately identified.

[0045] Combination Figure 2 As shown in the embodiments of this disclosure, another method for controlling water shortage in a dryer is provided, including:

[0046] S201, the processor obtains the absolute difference between the wet-bulb temperatures of the upper and lower chambers.

[0047] S202, if the absolute difference is greater than the first preset difference, the processor outputs the first warning message.

[0048] S203, if the absolute difference is less than or equal to the first preset difference, the processor obtains the real-time difference between the dry and wet bulb temperatures of the upper and lower racks in the drying room.

[0049] S204, if the real-time difference between the upper shelf and / or the lower shelf is less than or equal to the second preset difference, the processor outputs a second warning message.

[0050] S205, when the real-time difference between the upper and lower shelves is less than or equal to the second preset difference, the processor determines the control strategy for the fresh air valve of the drying room.

[0051] S206, the processor controls the fresh air valve to execute control strategies.

[0052] Understandably, if either the upper or lower wet-bulb temperature sensor malfunctions due to water shortage, the drying control can be based on the reading from the other sensor. However, if both sensors fail to replenish water, the accuracy of the drying control will be affected if not addressed promptly, particularly impacting the humidity control within the drying chamber. Therefore, to ensure adequate relative humidity in the drying room after both sensors fail to replenish water, a control strategy for the fresh air valve is determined. This strategy is then implemented to ensure the timely removal of humid air from the room.

[0053] Specifically, the control strategy for the fresh air valve can be determined based on historical control data from the current drying stage. Alternatively, it can be determined based on the material's moisture loss and exhaust volume during the current drying stage. For example, the amount of water evaporated from the material can be determined, along with the time required for it to be discharged under the current exhaust volume. The fresh air valve can then be kept open for that duration. In this way, even when the relative humidity inside the drying chamber cannot be accurately obtained, the fresh air valve can still be controlled to maintain the required relative humidity within the drying chamber.

[0054] Combination Figure 3 As shown in the embodiments of this disclosure, another method for controlling water shortage in a dryer is provided, including:

[0055] S201, the processor obtains the absolute difference between the wet-bulb temperatures of the upper and lower chambers.

[0056] S202, if the absolute difference is greater than the first preset difference, the processor outputs the first warning message.

[0057] S203, if the absolute difference is less than or equal to the first preset difference, the processor obtains the real-time difference between the dry and wet bulb temperatures of the upper and lower racks in the drying room.

[0058] S204, if the real-time difference between the upper shelf and / or the lower shelf is less than or equal to the second preset difference, the processor outputs a second warning message.

[0059] S251, when the real-time difference between the upper and lower sheds is less than or equal to the second preset difference, the processor obtains the current drying stage and moisture discharge of the material in the drying room.

[0060] S252, the processor determines the amount of moisture loss of the material to be dried based on the current drying stage.

[0061] S253, the processor determines the control strategy for the fresh air valve based on the amount of moisture exhaled and the amount of water lost.

[0062] S206, the processor controls the fresh air valve to execute control strategies.

[0063] Here, with both the upper and lower wet-bulb temperature sensors lacking water, the current drying stage of the material and the dryer's moisture discharge rate are obtained. Based on the current drying stage, the moisture loss of the material is then determined. The moisture loss varies at different drying stages. The correlation between the drying stage and moisture loss can be established, thus determining the moisture loss at the current drying stage. The moisture discharge rate of the drying chamber can be determined by the amount of fresh air introduced by the fresh air fan. Understandably, with a constant drying chamber pressure, the introduced fresh air volume equals the exhaust volume. Ignoring the moisture content of the fresh air, the exhaust volume is approximately equal to the moisture discharge rate.

[0064] Furthermore, the control strategy for the fresh air valve can be determined based on the amount of moisture discharged and the amount of water lost. As an example, the opening degree of the fresh air valve is determined based on the amount of moisture discharged and the amount of water lost per unit time. That is, the ratio of water loss to moisture discharged per unit time is calculated, and the product of the maximum opening degree of the fresh air valve and this ratio is taken as the opening degree of the fresh air valve. Thus, during the current drying stage, the fresh air valve is controlled to maintain this opening degree, thereby regulating the relative humidity in the drying room.

[0065] Optionally, in step S251, the processor obtains the dehumidification rate of the drying chamber, including:

[0066] The processor obtains the exhaust air volume of the drying room and the humidity of the air inside the drying room.

[0067] The processor calculates the product of the exhaust air volume and the air humidity, and uses the product as the exhaust volume.

[0068] Here, the influence of the outdoor fresh air humidity on the humidity inside the drying room is not considered. Therefore, the dehumidification rate of the drying room during the current drying stage is equal to the product of the dehumidification air volume and the humidity content of the air inside the drying room. The humidity content of the air inside the drying room can be obtained by converting it to the target humidity for the current drying stage. As shown in Table 1, the data in Table 1 are calculated based on a dehumidification air volume of 3000 m³ / h.

[0069] Table 1

[0070]

[0071] In some embodiments, the humidity content of the outdoor fresh air needs to be considered. In this case, the dehumidification volume = dehumidification air volume * (humidity content of the drying room air - humidity content of the fresh air).

[0072] Optionally, in step S252, the processor determines the moisture loss of the material to be dried based on the current drying stage, including:

[0073] The processor obtains the average percentage of water loss and the total weight of the material at the current drying stage.

[0074] The processor determines the amount of moisture loss of the dried material as the product of the total weight and the average percentage of moisture loss.

[0075] Here, the water loss of the material is related to its weight and the average percentage water loss rate during the current drying stage. The water loss of the material at that weight can be calculated by multiplying these two factors. The material weight refers to the weight of the material before drying. This allows for a relatively accurate calculation of the corresponding water loss even when the weight of the material being dried varies each time.

[0076] Optionally, in step S253, the processor determines the control strategy for the fresh air valve based on the dehumidification and water loss, including:

[0077] The processor calculates the ratio of water loss to moisture release.

[0078] The processor uses the ratio as a weighting of the fresh air valve's opening and closing time.

[0079] The processor determines the opening and closing duration of the fresh air valve in each switching cycle based on the proportion of the fresh air valve's opening and closing duration.

[0080] Here, the ratio of water loss to moisture removal is obtained and used as the weighting factor for the fresh air valve's on / off duration. Within the fresh air valve's control cycle, the ratio of the valve's open time to its closed time is the weighting factor for the on / off duration. Taking Table 1 as an example, when the ratio of water loss to moisture removal is 12.07%, if the fresh air valve's on / off cycle is 10 minutes, then the fresh air valve needs to remain open for 1.1 minutes and closed for 8.9 minutes during that time period. This allows for relatively accurate control of the fresh air valve's state. Furthermore, "fresh air valve open" means the fresh air valve is in a fully open state.

[0081] Combination Figure 4 As shown in the embodiments of this disclosure, another method for controlling water shortage in a dryer is provided, including:

[0082] S301, the processor obtains the absolute difference between the wet-bulb temperatures of the upper and lower chambers.

[0083] S302, the processor determines whether the absolute difference is greater than the first preset difference. If yes, then execute S303; otherwise, execute S306.

[0084] S303, the processor determines whether the wet-bulb temperature of the upper rack is greater than that of the lower rack. If yes, then execute S304; otherwise, execute S305.

[0085] S304, the processor outputs a warning message indicating that the wet-bulb top is low on water.

[0086] S305, the processor outputs a warning message indicating that the wet-bulb temperature of the lower section is low.

[0087] S306, the processor obtains the real-time difference between the wet and dry bulb temperatures of the upper and lower racks in the drying chamber.

[0088] S307, if the real-time difference between the upper shelf and / or the lower shelf is less than or equal to the second preset difference, the processor outputs a second warning message.

[0089] S308, when the real-time difference between the upper and lower shelves is less than or equal to the second preset difference, the processor obtains the dehumidification air volume of the drying room and the air humidity in the drying room.

[0090] S309, the processor calculates the product of the exhaust air volume and the air moisture content, and uses the product as the exhaust volume.

[0091] S310, the processor obtains the average percentage water loss rate and the total weight of the material at the current drying stage.

[0092] S311, the processor determines the moisture loss of the dried material as the product of the total weight and the average moisture loss percentage.

[0093] S312, the processor calculates the ratio of water loss to moisture removal; the ratio is used as the percentage of the fresh air valve's on / off time.

[0094] S313, the processor determines the opening and closing time of the fresh air valve in each opening and closing cycle based on the proportion of the opening and closing time of the fresh air valve.

[0095] S314, the processor controls the fresh air valve to switch on and off according to the on / off duration in the switching cycle.

[0096] This disclosure provides an apparatus for controlling water shortage in a dryer, including a first acquisition module, a first output module, a second acquisition module, and a second output module. The first acquisition module is configured to acquire the absolute difference between the wet-bulb temperatures of the upper and lower drying chambers. The first output module is configured to output a first warning if the absolute difference is greater than a first preset difference. The second acquisition module is configured to acquire the real-time difference between the wet-bulb and dry-bulb temperatures of the upper and lower drying chambers if the absolute difference is less than or equal to the first preset difference. The second output module is configured to output a second warning if the real-time difference between the upper and / or lower drying chambers is less than a second preset difference but greater than a third preset difference.

[0097] The device for controlling water shortage in a dryer, as provided in this embodiment, determines whether the wet-bulb temperature sensor is short of water by judging the absolute difference between the wet-bulb temperatures of the upper and lower shelves. Under normal circumstances, the humidity and temperature difference between the upper and lower shelves is small. If the absolute difference increases, it indicates that one of the wet-bulb temperature sensors is short of water. When the temperature difference is small, the dry-bulb and wet-bulb temperature differences of the upper and lower shelves are compared separately. When the dry-bulb and wet-bulb temperature difference meets the corresponding conditions, it is determined that the wet-bulb temperature sensor is short of water. This avoids the situation where both the upper and lower humidity and temperature sensors fail simultaneously, preventing timely output of a prompt based on the absolute difference between them. Thus, by judging two sets of parameters, the water shortage of the wet-bulb temperature sensor can be detected promptly.

[0098] Combination Figure 5 As shown, this disclosure provides an apparatus 200 for controlling water shortage in a dryer, including a processor 100 and a memory 101. Optionally, the apparatus may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the method for controlling water shortage in a dryer described in the above embodiment.

[0099] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0100] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the method for controlling water shortage in the dryer in the above embodiments.

[0101] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0102] Combination Figure 6 As shown, this disclosure provides a dryer 300, including a dryer body and the aforementioned device 200 for controlling dryer water shortage. The device 200 for controlling dryer water shortage is installed on the dryer body. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the device 200 for controlling dryer water shortage can be adapted to any suitable dryer body to achieve other feasible embodiments.

[0103] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling water shortage in a dryer.

[0104] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0105] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0106] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0107] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0108] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0109] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling water shortage in a dryer, characterized in that, include: Obtain the absolute difference between the wet-bulb temperatures of the upper and lower chambers; If the absolute difference is greater than the first preset difference, a first warning message will be output. If the absolute difference is less than or equal to the first preset difference, then the real-time difference between the wet and dry bulb temperatures of the upper and lower racks in the drying room is obtained. If the real-time difference between the upper and / or lower ceilings is less than or equal to the second preset difference, a second warning message will be output. When the real-time difference between the upper and lower sheds is less than or equal to the second preset difference, the current drying stage and moisture discharge of the material to be dried in the drying room are obtained. Based on the current drying stage, determine the amount of water loss of the material being dried; Based on the moisture discharge and water loss, a control strategy for the fresh air valve is determined; wherein, the ratio of the water loss to the moisture discharge is calculated; the ratio is used as the percentage of the fresh air valve's on / off time; and the on / off time of the fresh air valve in each on / off cycle is determined based on the percentage of the fresh air valve's on / off time. The control strategy is executed by controlling the fresh air valve.

2. The method according to claim 1, characterized in that, When the absolute difference is greater than a first preset difference, a first warning message is output, including: If the wet-bulb temperature of the upper chamber is higher than that of the lower chamber, a warning message indicating that the upper chamber wet-bulb is low on water will be output. If the wet-bulb temperature of the upper bulb is lower than that of the lower bulb, a warning message indicating that the lower bulb is low on water will be output.

3. The method according to claim 1, characterized in that, The process of obtaining the dehumidification rate of the drying room includes: Obtain the exhaust air volume and air humidity content inside the drying room; Calculate the product of the dehumidification air volume and the air humidity content, and use the product as the dehumidification volume.

4. The method according to claim 1, characterized in that, Determining the moisture loss of the material to be dried based on the current drying stage includes: Obtain the average percentage water loss rate and total weight of the material at the current drying stage; The amount of water loss of the dried material is determined to be the product of the total weight and the average water loss percentage.

5. A device for controlling water shortage in a dryer, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the method for controlling water shortage in a dryer as described in any one of claims 1 to 4.

6. A dryer, characterized in that, include: Dryer body; The device for controlling water shortage in a dryer as described in claim 5 is installed on the dryer body.

7. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling water shortage in a dryer as described in any one of claims 1 to 4.

Images