Intelligent temperature and humidity energy-saving control method and system for dryer

Abstract

The invention discloses an intelligent temperature and humidity energy-saving control method and system for a dryer, and the method comprises the steps: responding to a request for starting a steam control valve and a frequency conversion fan of the dryer, collecting the exhaust air temperature tn and the exhaust air humidity hn in real time, recording the highest exhaust air temperature at the time period as t < highest > within the preheating time period of 1-5 min, and recording the temperature of the exhaust air at the time period as t < highest >; meanwhile, the exhaust humidity at the corresponding moment is recorded as h minimum, the minimum exhaust temperature at the time period is recorded as t minimum, and the exhaust humidity at the corresponding moment is recorded as h maximum; and after the preheating period, detecting that v1 is more than 0 and less than or equal to 2 DEG C, and / or v2 is more than 0 and less than or equal to 3% RH, and if t < maximum > tn > t < minimum > and h < maximum > hn > h < minimum >, judging that the linen reaches the drying standard, and stopping the drying procedure. According to the method, the sensitivity to the initial state difference of the linen is greatly reduced through the dynamic reference method, the drying end point can be judged more accurately, and the problems of excessive drying and insufficient drying are fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of dryer control technology, specifically to an intelligent temperature and humidity energy-saving control method and system for dryers. Background Technology

[0002] A dryer is a type of laundry machinery used after washing and spin-drying to remove moisture from clothing and other textiles. In the industrial laundry industry, its working principle is as follows: By controlling the opening of the steam valve, high-temperature steam (100-150℃) is introduced into the dryer. The heat energy of the steam is directly transferred to the linens (including sheets, towels, duvet covers, tablecloths, and other fabric products), causing the moisture in the linens to evaporate continuously. Then, a fan extracts the humid air from the machine until the set drying standard is reached, at which point the process stops. During this process, because the evaporation of moisture in the linens requires the absorption and consumption of heat energy, the exhaust temperature of the dryer gradually increases as the moisture in the linens decreases, while the exhaust humidity gradually decreases as the exhaust temperature increases.

[0003] In existing technologies, the drying status is often determined by collecting exhaust air temperature or humidity and comparing it with a set threshold. However, due to the different types of linens (single or mixed linens), their initial moisture content and target drying standards vary. If a fixed default threshold control program is used, it may lead to over-drying or under-drying, which wastes energy and may require rework, seriously affecting work efficiency. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, one of the objectives of this invention is to provide an intelligent temperature and humidity energy-saving control method for a dryer, thereby solving the aforementioned traditional problems.

[0005] The second objective of this invention is to provide an intelligent temperature and humidity energy-saving control system for a dryer that employs this control method.

[0006] One of the objectives of this invention is achieved through the following technical solution: A method for intelligent temperature and humidity energy-saving control of a dryer includes the following steps: S1: In response to the start signal of the dryer program, perform equipment self-test; S2: In response to the request from the dryer to start the steam control valve and the variable frequency fan, the system collects the exhaust temperature t in real time. n and exhaust humidity h n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 ; S3: After the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v1 ≤ 2℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v2 ≤ 3%RH, then if t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

[0007] Preferably, in step S2, the control steps for starting the steam control valve and the variable frequency fan of the dryer include: The status of the steam control valves of the dryer is collected and the number of valves opened (m) is counted. Based on the number of valves opened (m) and the fan frequency adjustment formula (f), the following steps are taken: m =f 下限频率 + m×f 预设增加频率 The fan frequency f is dynamically calculated. m According to the fan frequency f m Start the fan, where f m The frequency of the fan is expressed in Hz, f. 下限频率 The lower limit frequency value of the blower is in Hz, m is the number of steam control valves that are open, and f is the number of valves that are open. 预设增加频率 The frequency increment is preset for each fan, in Hz.

[0008] Preferably, f m =25-50 Hz, f 下限频率 =25-35Hz, m=0-n, n is a positive integer, f 预设增加频率 =0-10 Hz.

[0009] Preferably, the control steps for starting the steam control valve and variable frequency fan of the dryer further include: If m=0, start the delay, then decrease to f. 下限频率 If an abnormality is detected in the steam control valve or a communication failure, the corresponding alarm will be triggered, and the variable frequency fan will be shut down when the delay time is up. If m > 0, the calculated fan frequency f m If the frequency is greater than the upper limit of the fan frequency, then the fan frequency f m = Upper limit frequency value of the wind turbine.

[0010] Preferably, in step S2, the number of exhaust temperature sensors A ≥ 2, the number of exhaust humidity sensors B ≥ 2, and the exhaust temperature t nThe average exhaust temperature value detected by each exhaust temperature sensor, and the exhaust humidity h. n The average exhaust humidity value detected by each exhaust humidity sensor is used. If the temperature difference between any two exhaust temperature sensors is greater than 3°C, the exhaust temperature sensor is considered faulty and the system will alarm. If the difference between any two exhaust humidity sensors is greater than 5%RH, the exhaust humidity sensor is considered faulty and the system will alarm.

[0011] Preferably, A = 2-3 and B = 2-3.

[0012] Preferably, the intelligent temperature and humidity energy-saving control method for the dryer further includes: S4: In response to the selection of linen type in the dryer, if the linen type is mixed linen, step S2 is executed to perform the drying procedure; if the linen type is single linen, the following drying procedure is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t' during that period. 平均 and average humidity h' 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process. After the preheating period, the rate of change between adjacent exhaust air temperatures was detected to be 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity was detected to be 0 < v'2 ≤ 2%RH. If t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低 If the linens have reached the drying standard, the drying process is stopped. Otherwise, the process returns to the judgment steps of "the rate of change between adjacent exhaust air temperatures 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity 0 < v'2 ≤ 2%RH".

[0013] The second objective of this invention is achieved by the following technical solution: A smart temperature and humidity energy-saving control system for a dryer includes: The acquisition module is used to perform equipment self-test in response to the start signal of the dryer program; The calculation module is used to respond to requests from the dryer to start the steam control valves and variable frequency fans. The system collects the exhaust temperature t in real time. n and exhaust humidity h n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低 At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 ; The judgment module is used to detect, after the preheating period, the rate of change between adjacent exhaust air temperatures (0 < v1 ≤ 2℃) and / or the rate of change between adjacent exhaust air humidity (0 < v2 ≤ 3%RH). If t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

[0014] Preferably, the intelligent temperature and humidity energy-saving control system for the dryer further includes: The selection module responds to the selection of linen type in the dryer. When the linen type is mixed linen, the drying program of the calculation module is executed; when the linen type is single linen, the following drying program is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t during that period. 平均 and average humidity h 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process; after the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v'2 ≤ 2%RH, then if t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The control method of the present invention greatly reduces the sensitivity to differences in the initial state of linens through the dynamic benchmark method, and can more accurately determine the drying endpoint, fundamentally avoiding the problems of over-drying (energy saving, reducing fabric damage) and under-drying (ensuring quality, avoiding rework).

[0016] 2. The control method of the present invention directly reduces unnecessary drying time through precise shutdown judgment, and achieves optimization of energy consumption throughout the process by combining the linkage control of fan frequency and steam supply.

[0017] 3. The control method of the present invention does not rely on fixed, empirical thresholds, but allows the control system to "learn" the initial conditions of each drying process and adaptively generate judgment criteria, making it more universal. Attached Figure Description

[0018] Figure 1 This is the first control logic diagram of the intelligent temperature and humidity energy-saving control method for the dryer of the present invention; Figure 2 This is the second control logic diagram of the intelligent temperature and humidity energy-saving control method for the dryer of the present invention. Detailed Implementation

[0019] 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.

[0020] In the description of this invention, it should be understood that 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 indicated technical features. 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.

[0021] In the description of this invention, it should be understood that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is referred to as being "directly" connected to another element, there are no intermediate elements.

[0022] In this invention, the dryer includes a dryer body, a steam heating pipe, a gas exhaust pipe, a heat exchanger, a fresh air inlet pipe, and a return air pipe connected to the dryer body. The dryer body is equipped with a drying chamber and a control panel. The drying chamber is connected to the steam heating pipe and the gas exhaust pipe, respectively. The drying chamber is, but is not limited to, a drum type. The control panel is equipped with a start button, a stop button, a disable button, a setting button, and at least one equipment status indicator light. The setting button is used to set control parameters such as temperature and time. The equipment status indicator light can be yellow, green, red, etc., and the different colors of the lights indicate different status parameters. The system displays the status of different equipment. The steam heating pipeline is divided into multiple steam heating branch pipes, each equipped with a steam control valve, such as steam valve S1, steam valve S2, steam valve S3, and steam valve S4. By controlling the status of each steam control valve, the total steam supply is controlled. The gas exhaust pipeline is equipped with a temperature sensor, a humidity sensor, and a variable frequency fan. The temperature sensor detects the gas temperature in the exhaust pipeline, and the humidity sensor detects the gas humidity. Through their combined operation, the system determines when to stop the drying process. The variable frequency fan adjusts its frequency according to the total steam supply, which helps to accelerate the drying of linens and save energy. The heat exchanger is located on the gas exhaust duct, and the return air duct is connected to the fresh air intake duct. The fresh air intake duct is equipped with a dryer or filter to dry the air or filter impurities, and introduces fresh outdoor air into the dryer body. Together with high-temperature steam, it dries the linens inside the dryer body. The return air duct is equipped with a return air control valve to control the return air volume. The heat exchange end of the heat exchanger is connected to the fresh air intake duct and the return air duct respectively. The heat exchanger transfers the heat energy in the gas exhaust duct to the fresh air entering the dryer body to dry the linens, thereby reducing the use of steam. This recovery process helps to recover the heat energy in the gas exhaust duct and achieve the best energy-saving effect.

[0023] To address the problem of traditional technologies using fixed default thresholds to determine drying status, such as... Figure 1 As shown, the present invention provides an intelligent temperature and humidity energy-saving control method for a dryer, which includes the following steps: S1: In response to the start signal of the dryer program, perform equipment self-test and determine whether there is a communication abnormality in the temperature sensor and humidity sensor. If there is an abnormality, the system will standby and the indicator light will show yellow. If there is no abnormality, proceed to the next step. In this step, after the operator places the linens into the dryer, closes the dryer door, and presses the start button, the system detects the start signal and performs self-checks on its related equipment, such as whether the power supply to each device is normal, whether there are any alarm signals in the program, and whether the communication between each device is normal, to ensure that the dryer can be detected and operated normally afterwards. If an abnormal alarm occurs, the relevant operator will handle the abnormal alarm accordingly, and then start the equipment normally. In order to avoid affecting the normal control logic of the dryer's original control system, the control method of this invention is an embedded structure. By acquiring the relevant parameters of the dryer, and then judging the drying status of the linens according to the judgment logic of this invention, the opening and closing of the steam control valve, variable frequency fan, etc. can be controlled to achieve precise control and energy-saving effect.

[0024] In other embodiments, other materials may be used instead of linens as required, and corresponding parameters may be set according to the specific material conditions, which will not be elaborated here.

[0025] S2: In response to the request from the dryer to start the steam control valve and the variable frequency fan, the system collects the exhaust temperature t in real time. n and exhaust humidity h n (n is a positive integer, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc., which can be set according to the program to collect data at time intervals of one second or one minute.) During the preheating period of 1-5 minutes after the steam control valve is opened (such as 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, etc.), the highest exhaust air temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低 At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 This serves as a reference threshold for dynamic adjustment during the subsequent drying process.

[0026] In this step, during the preheating period when the high-temperature steam first comes into contact with the linen, the linen temperature is relatively low while the high-temperature steam temperature is relatively high. When the high-temperature steam comes into contact with the linen surface, it quickly liquefies into small water droplets at the same temperature, releasing a large amount of latent heat. The released latent heat and the heat energy of the high-temperature steam are also absorbed by the linen and the moisture. During this process, the inventors discovered that the exhaust air temperature will briefly rise (not higher than the high-temperature steam temperature, and reaching a brief temperature and humidity equilibrium), but the exhaust air humidity will not increase significantly. The highest and lowest exhaust air temperatures at this time are used as reference thresholds for dynamic adjustment. Combined with the lowest and highest exhaust air humidity at this time, they serve as thermodynamic signals that approach the drying end point in the drying process, replacing the traditional fixed threshold. This reduces the need to consider differences in the initial moisture content, material, and load of the linen, and achieves dynamic threshold adjustment, thus avoiding the problem of judging the drying status based on a fixed default threshold in traditional technology.

[0027] In one embodiment, the control steps for starting the steam control valve and the variable frequency fan of the dryer include: Collect the status of the steam control valves of the dryer and count the number of valves opened (m), and the number of steam control valves (S). m For example, steam valves S1, S2, S3, S4, etc. (m is an integer from 0 to 10, such as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.). If the frequency converter of the fan is communicating normally, the number of valves opened (m) and the fan frequency adjustment formula (f) are used. m =f 下限频率 + m×f 预设增加频率 The fan frequency f is dynamically calculated. m , where f m The frequency of the fan is expressed in Hz, f. 下限频率 The lower limit frequency value of the blower is in Hz, m is the number of steam control valves that are open, and f is the number of valves that are open. 预设增加频率 Preset an additional frequency for each fan, in Hz, preferably f. m =25-50Hz (e.g., 25Hz, 30Hz, 35Hz, 40Hz, 45Hz, 50Hz, etc.), f 下限频率 =25-35Hz (e.g., 25Hz, 30Hz, 35Hz, etc.), m=0-n, where n is a positive integer (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10… etc., which can be set according to the program, preferably n=4), f 预设增加频率 =0-10 Hz (excluding 0) (e.g., 1Hz, 3Hz, 5Hz, 8Hz, 10Hz, etc.), for example, f m =25 + 0 × 10 = 25 Hz, f m =25 + 4×5=45Hz, etc. Based on the fan frequency f m Start the fan.

[0028] If m=0, start with a delay (e.g., 10-30s), then decrease to f. 下限频率 If an abnormality is detected in the steam control valve or a communication failure, the corresponding alarm will be triggered. An abnormality in the steam control valve includes signal loss or ≥3 state changes within 1 second. If the dryer is just started, m=0, meaning the steam control valve is not open, the fan needs to be turned on at the lowest frequency to ventilate the dryer. When the delay time is up, the variable frequency fan will be turned off to save energy.

[0029] If m > 0, the calculated fan frequency f m If the frequency is greater than the upper limit of the fan frequency, then the fan frequency f m = Upper limit frequency value of the fan, such as 50 Hz.

[0030] The above steps, by dynamically adjusting the fan frequency according to the number of valves opened, avoid ineffective energy consumption, and at the same time, can promptly extract moisture from the dryer through the fan, thereby improving drying efficiency.

[0031] S3: After the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v1 ≤ 2℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v2 ≤ 3%RH, then if t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens reach the drying standard, the drying process is stopped, the indicator light turns red, and the machine waits for linens to be added before starting the next drying cycle (if no linens are added at this time, the drying process ends and the dryer goes into standby mode). Otherwise, the process returns to the judgment steps of "the rate of change between adjacent exhaust air temperatures 0 < v1 ≤ 2℃, and / or the rate of change between adjacent exhaust air humidity 0 < v2 ≤ 3%RH" until "t" is met. 最高 >t n >t 最低 h 最高 >h n >h 最低 The drying standard requirements.

[0032] In this step, if the exhaust temperature and humidity can reach the above standards, this is the temperature and humidity balance point inside the dryer. If the drying process continues, it will lead to over-drying. If the drying process is stopped before this balance point, it will lead to insufficient drying, which may require rework.

[0033] In the above steps, the number of exhaust temperature sensors A of the dryer should be ≥2, such as 2-3; the number of exhaust humidity sensors B of the dryer should be ≥2, such as 2-3; and the exhaust temperature t should be... nThe average exhaust temperature value detected by each exhaust temperature sensor, and the exhaust humidity h. n The average exhaust humidity value detected by each exhaust humidity sensor helps improve the detection accuracy of the sensors. When the temperature difference between any two exhaust temperature sensors is greater than 3℃ (this temperature can be adjusted according to needs, such as 1℃, 2℃, 4℃, 5℃, etc.), the exhaust temperature sensor is judged to be faulty, and the system alarms. Similarly, when the difference between any two exhaust humidity sensors is greater than 5%RH (this humidity can be adjusted according to needs, such as 1%RH, 2%RH, 3%RH, 4%RH, 6%RH, 7%RH, etc.), the exhaust humidity sensor is judged to be faulty, and the system alarms.

[0034] S4: As Figure 2 As shown, in response to the selection of linen type in the dryer, when the linen type is mixed linen, step S2 is executed to perform the drying procedure; when the linen type is single linen, the following drying procedure is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t' during that period. 平均 and average humidity h' 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process. After the preheating period, the rate of change between adjacent exhaust air temperatures is detected as 0 < v'1 ≤ 1℃ (this temperature can be adjusted according to requirements, and will not be elaborated here), and / or the rate of change between adjacent exhaust air humidity is detected as 0 < v'2 ≤ 2%RH (this humidity can be adjusted according to requirements, and will not be elaborated here). If t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低 If the linens have reached the drying standard, the drying process is stopped. Otherwise, the process returns to the judgment steps of "the rate of change between adjacent exhaust air temperatures 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity 0 < v'2 ≤ 2%RH".

[0035] In other embodiments, when the type of linens for the dryer is not selected (or the dryer does not have an option to select the type of linens), the type of linens is identified as mixed linens, and step S2 is executed to perform the drying process.

[0036] In the above steps, by selecting the type of linens and adjusting the lower limits of exhaust temperature and humidity in a timely manner, the accuracy and adaptability of drying judgment can be improved, and more precise drying control can be achieved.

[0037] In other embodiments, the present invention also provides an intelligent temperature and humidity energy-saving control system for a dryer, comprising: The acquisition module is used to perform equipment self-test in response to the start signal of the dryer program; The calculation module is used to respond to requests from the dryer to start the steam control valves and variable frequency fans. The system collects the exhaust temperature t in real time. n and exhaust humidity h n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低 At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 ; The judgment module is used to detect, after the preheating period, the rate of change between adjacent exhaust air temperatures (0 < v1 ≤ 2℃) and / or the rate of change between adjacent exhaust air humidity (0 < v2 ≤ 3%RH). If t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens have reached the required drying standard, the drying process will stop; otherwise, it will return to normal. The selection module responds to the selection of linen type in the dryer. When the linen type is mixed linen, the drying program of the calculation module is executed; when the linen type is single linen, the following drying program is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t during that period.平均 and average humidity h 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process; after the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v'2 ≤ 2%RH, then if t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

[0038] If the type of linens for the dryer is not selected, the linens are identified as mixed linens, and the drying program of the calculation module is executed.

[0039] The aforementioned control method and system abandon the traditional method of relying on fixed temperature / humidity thresholds for shutdown judgment in dryers, and propose an adaptive control logic based on the collaborative judgment of dynamic benchmark and rate of change during the preheating stage, which has the following technical effects: 1. During the 1-5 minute preheating period after the start of the drying program, exhaust temperature and humidity data are collected in real time. This set of benchmark values ​​is derived from the initial thermodynamic response of the current batch of linens in contact with hot steam under specific initial conditions (moisture content, material, load), forming a dynamic "qualified range" specific to this drying process.

[0040] 2. After the preheating stage, multiple judgment criteria are used to indicate from a thermodynamic perspective that the linens have recovered from a moisture-absorbing state to a state in equilibrium with the initial thermal environment, which accurately corresponds to the physical essence of "drying completed" and effectively avoids over-drying or under-drying.

[0041] 3. For differentiated strategies based on linen types, the system can automatically match the optimal judgment algorithm by selecting the type of linen, further improving the accuracy and efficiency of control.

[0042] 4. Intelligent linkage control of fan frequency enables dynamic matching of exhaust volume and heating capacity. When the steam valve is open more (higher heating capacity), the fan speed automatically increases to enhance dehumidification and prevent excessive humidity inside the machine; when heating capacity is low, the fan speed decreases to save energy. This optimizes energy efficiency from a system coordination perspective.

[0043] 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.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, 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. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for intelligent temperature and humidity energy-saving control of a dryer, characterized in that, Includes the following steps: S1: In response to the start signal of the dryer program, perform equipment self-test; S2: In response to the request from the dryer to start the steam control valve and the variable frequency fan, the system collects the exhaust temperature t in real time. n and exhaust humidity h n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低 At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 ; S3: After the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v1 ≤ 2℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v2 ≤ 3%RH, then if t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

2. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 1, characterized in that, In step S2, the control steps for starting the steam control valve and variable frequency fan of the dryer include: The status of the steam control valves of the dryer is collected and the number of valves opened (m) is counted. Based on the number of valves opened (m) and the fan frequency adjustment formula (f), the following steps are taken: m =f 下限频率 + m×f 预设增加频率 The fan frequency f is dynamically calculated. m According to the fan frequency f m Start the fan, where f m The frequency of the fan is expressed in Hz, f. 下限频率 The lower limit frequency value of the blower is in Hz, m is the number of steam control valves that are open, and f is the number of valves that are open. 预设增加频率 The frequency increment is preset for each fan, in Hz.

3. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 2, characterized in that, f m =25-50 Hz, f 下限频率 =25-35Hz, m=0-n, n is a positive integer, f 预设增加频率 =0-10 Hz.

4. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 2, characterized in that, The control steps for starting the steam control valve and variable frequency fan of the dryer also include: If m=0, start the delay, then decrease to f. 下限频率 If an abnormality is detected in the steam control valve or a communication failure, the corresponding alarm will be triggered, and the variable frequency fan will be shut down when the delay time is up. If m > 0, the calculated fan frequency f m If the frequency is greater than the upper limit of the fan frequency, then the fan frequency f m = Upper limit frequency value of the wind turbine.

5. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 1, characterized in that, In step S2, the number of exhaust temperature sensors A ≥ 2, the number of exhaust humidity sensors B ≥ 2, and the exhaust temperature t n The average exhaust temperature value detected by each exhaust temperature sensor, and the exhaust humidity h. n The average exhaust humidity value detected by each exhaust humidity sensor is used. If the temperature difference between any two exhaust temperature sensors is greater than 3°C, the exhaust temperature sensor is considered faulty and the system will alarm. If the difference between any two exhaust humidity sensors is greater than 5%RH, the exhaust humidity sensor is considered faulty and the system will alarm.

6. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 5, characterized in that, A = 2-3, B = 2-3.

7. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 1, characterized in that, The intelligent temperature and humidity energy-saving control method for the dryer also includes: S4: In response to the selection of linen type in the dryer, if the linen type is mixed linen, step S2 is executed to perform the drying procedure; if the linen type is single linen, the following drying procedure is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t' during that period. 平均 and average humidity h' 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process. After the preheating period, the rate of change between adjacent exhaust air temperatures was detected to be 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity was detected to be 0 < v'2 ≤ 2%RH. If t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低 If the linens have reached the drying standard, the drying process is stopped. Otherwise, the process returns to the judgment steps of "the rate of change between adjacent exhaust air temperatures 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity 0 < v'2 ≤ 2%RH".

8. The intelligent temperature and humidity energy-saving control method for a dryer according to claim 7, characterized in that, Step S4 further includes: If the type of linens for the dryer is not selected, the linens are identified as mixed linens, and step S2 is executed to begin the drying process.

9. A smart temperature and humidity energy-saving control system for a dryer, characterized in that, include: The acquisition module is used to perform equipment self-test in response to the start signal of the dryer program; The calculation module is used to respond to requests from the dryer to start the steam control valves and variable frequency fans. The system collects the exhaust temperature t in real time. n and exhaust humidity h n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust temperature during this period is recorded as the highest temperature reference t. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h. 最低 The lowest exhaust temperature during that period is recorded as the lowest temperature baseline t. 最低 At the same time, the exhaust humidity at the moment corresponding to the lowest exhaust temperature is recorded as the highest humidity baseline h. 最高 ; The judgment module is used to detect, after the preheating period, the rate of change between adjacent exhaust air temperatures (0 < v1 ≤ 2℃) and / or the rate of change between adjacent exhaust air humidity (0 < v2 ≤ 3%RH). If t 最高 >t n >t 最低 h 最高 >h n >h 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

10. The intelligent temperature and humidity energy-saving control system for the dryer according to claim 9, characterized in that, The intelligent temperature and humidity energy-saving control system for the dryer also includes: The selection module responds to the selection of linen type in the dryer. When the linen type is mixed linen, the drying program of the calculation module is executed; when the linen type is single linen, the following drying program is executed: In response to the dryer's request to activate the steam control valves and variable frequency fan, the system collects the exhaust temperature t' in real time. n and exhaust humidity h' n During the 1-5 minute preheating period after the steam control valve is opened, the highest exhaust air temperature during this period is recorded as the highest temperature reference t'. 最高 At the same time, the exhaust humidity at the moment corresponding to the highest exhaust temperature is recorded as the lowest humidity baseline h'. 最低 And calculate the average temperature t during that period. 平均 and average humidity h 平均 This serves as a reference threshold for dynamic adjustment during the subsequent drying process; after the preheating period, if the rate of change between adjacent exhaust air temperatures is detected to be 0 < v'1 ≤ 1℃, and / or the rate of change between adjacent exhaust air humidity is detected to be 0 < v'2 ≤ 2%RH, then if t' 最高 >t' n >t' 平均 ,h' 平均 >h' n >h' 最低 If the linens reach the required drying standard, the drying process will stop; otherwise, it will return to normal.

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