A hot air circulation system and control method

Abstract

A hot air circulation system, the air outlet of a variable frequency fan is communicated with a filtering assembly, a primary circulation air duct, a secondary circulation air duct and a branch air duct in sequence, and the outlet of the branch air duct is used for outputting hot air; a heating assembly is arranged at the air inlet of the primary circulation air duct and is used for heating the incoming natural wind; the connection between the primary circulation air duct and the secondary circulation air duct and the connection between the secondary circulation air duct and the branch air duct are all provided with electric regulating valves for regulating the hot air flow; a data acquisition assembly includes multiple temperature sensors which are arranged in the primary circulation air duct, the secondary circulation air duct and each branch air duct respectively and are used for acquiring temperature data at each place; a central control module is electrically connected with the variable frequency fan, the heating assembly and each electric regulating valve, is used for dynamically adjusting the rotating speed of the variable frequency fan, the power output of the heating assembly and the opening of each electric regulating valve according to the temperature signals acquired by the data acquisition assembly, so as to realize accurate control of the hot air temperature and flow.

Description

Technical Field

[0001] This invention relates to the field of printing auxiliary equipment, and more specifically to a hot air circulation system and control method. Background Technology

[0002] Hot air circulation technology, an indispensable auxiliary process in the printing industry, continuously and stably delivers heat to the surface of the printing media to be dried or heated by recycling heated air, thereby achieving energy-saving and efficient production and optimizing product quality. However, most current hot air drying systems adopt a separate heating design, meaning that the heated air is directly used for drying or discharged after heating without being recycled. This model has many significant shortcomings. Existing technologies suffer from insufficient precision in hot air temperature control. Individual heating systems often lack flexible temperature adjustment capabilities, making it difficult to accurately control the hot air temperature according to the characteristics of different printing media. This can easily lead to localized overheating or insufficient heat, affecting print quality. Uneven hot air distribution is particularly problematic, especially in multi-branch duct designs where significant differences in hot air distribution across branches result in inconsistent drying effects, directly impacting the consistency of the finished product. Furthermore, existing systems are inefficient in energy utilization. Because the heated air is not recycled, each heating cycle consumes a large amount of energy, increasing operating costs. Therefore, to address these issues, a hot air circulation system and control method are needed. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by proposing a hot air circulation system and its control method. The specific technical solution of the hot air circulation system is as follows: A hot air circulation system, characterized in that: It includes data acquisition components, a central control module, a variable frequency fan, a heating component, a primary circulating air duct, a secondary circulating air duct, and branch air ducts; The outlet of the variable frequency fan is connected in sequence to the filter assembly, the primary circulation duct, the secondary circulation duct and the branch duct, and the outlet of the branch duct is used to output hot air. The heating component is located at the air inlet of the primary circulating air duct and is used to heat the incoming natural air. Electric regulating valves are installed at the connection between the primary circulation duct and the secondary circulation duct, and at the connection between the secondary circulation duct and the branch duct, to regulate the hot air flow. The data acquisition component includes multiple temperature sensors, which are respectively arranged in the primary circulation duct, the secondary circulation duct and each branch duct, for collecting temperature data at various locations. The central control module is electrically connected to the variable frequency fan, heating component, and each electric regulating valve. It is used to dynamically adjust the speed of the variable frequency fan, the power output of the heating component, and the opening degree of each electric regulating valve according to the temperature signal collected by the data acquisition component, so as to achieve precise control of hot air temperature and flow rate.

[0004] To better realize the present invention, it can be further: The central control module includes a storage module and a data analysis module. The storage module is used to save the target temperature range and control parameters, and the data analysis module is used to analyze the temperature signals collected by the data acquisition component in real time, and to calculate and adjust the operating parameters of the variable frequency fan, heating component and electric regulating valve according to the deviation.

[0005] Furthermore, each branch duct inlet is equipped with an independent electric regulating valve. The central control module controls the opening of the corresponding electric regulating valve according to the temperature signal collected by the temperature sensor of the branch duct, so as to realize the independent adjustment of the hot air temperature and flow rate of different branch ducts.

[0006] Furthermore, the data acquisition component also includes an ambient temperature sensor and a wind speed sensor, which are respectively arranged at the air inlet of the primary circulation duct. The central control module dynamically adjusts the power output of the heating component and the speed of the variable frequency fan according to the ambient temperature and wind speed signals to compensate for the impact of external environmental changes on the system's hot air output.

[0007] The specific technical solution of a control method for a hot air circulation system is as follows: A control method for a hot air circulation system, characterized in that: Includes the following steps: S1: The data acquisition component collects real-time temperature data of the corresponding air ducts through temperature sensors of the primary circulating air duct, secondary circulating air duct and branch air duct, and transmits the temperature data to the central control module. S2: The central control module adjusts the speed of the variable frequency fan, the power output of the heating components, and the opening degree of the electric regulating valve at each air duct inlet according to the collected temperature data. S3: The central control module uses temperature sensors in the branch ducts to detect the temperature difference at the branch outlets in real time, and dynamically adjusts the opening of the electric regulating valves of each branch according to the temperature requirements to output hot air at different temperatures. S4: When the data acquisition component detects that the temperature deviation exceeds the set range, the central control module triggers the abnormal handling program, adjusts the fan speed and heating power, and records the abnormal data; S5: When shutdown is required, the central control module gradually reduces the fan speed and heating power, and closes the electric regulating valve.

[0008] To better realize the present invention, S2 may further include: S2-1: The heating component in the primary circulating air duct adjusts its output power according to the real-time data from the inlet temperature sensor to ensure that the hot air temperature reaches the preset range. S2-2: The electric regulating valve at the inlet of the secondary circulation duct adjusts its opening according to the temperature data of the primary circulation duct to control the flow rate of hot air entering the secondary circulation duct; S2-3: The variable frequency fan dynamically adjusts the airflow speed in the duct based on real-time data from the secondary circulation duct temperature sensor.

[0009] Furthermore: In S3, differentiated hot air output is achieved through temperature control of the branch ducts, specifically including: S3-1: The central control module calculates the target temperature difference of each branch duct based on the temperature sensor data at the outlet of the branch duct. S3-2: The electric regulating valves at the inlet of each branch air duct are set according to the target temperature to adjust the flow rate and proportion of the incoming hot air and output hot air at different temperatures; S3-3: Through the secondary return pipe, some hot air is introduced into the secondary circulation duct to achieve temperature rebalancing.

[0010] Further: In step S4, the exception handling procedure includes the following steps: S4-1: When the temperature deviation in any air duct exceeds the target range, the central control module analyzes the real-time data collected by the temperature sensor to locate the specific air duct with the temperature deviation and its location, and confirms the degree of deviation between the deviation value and the target range. S4-2: Based on the magnitude of the deviation, the central control module reduces the speed of the variable frequency fan in stages to slow down the airflow and prevent abnormal hot air from spreading to other air ducts. S4-3: The central control module dynamically adjusts the power output of the heating components based on the deviation data, prioritizing the reduction of the overall temperature of the hot air in the primary circulating air duct to ensure that the temperature quickly returns to the target range; S4-3: The central control module records the deviation range, adjustment strategy, and real-time temperature change data to the control log.

[0011] The beneficial effects of this invention are as follows: The overall structure is simple. By employing a graded circulation design with primary and secondary circulating air ducts, hot air is fully utilized, achieving efficient heat recovery and distribution. Powered by a variable frequency fan, combined with heating components, the natural air is heated. The hot air in the primary circulating air duct is effectively heated and then distributed to various branch air ducts via the secondary circulating air duct, significantly reducing heat waste and improving overall energy efficiency. Temperature sensors are placed in the primary, secondary, and branch air ducts to collect hot air temperature data in real time and transmit it to the central control module for processing. Based on the temperature signal, the central control module dynamically adjusts the speed of the variable frequency fan, the power output of the heating components, and the opening of the electric regulating valve, achieving precise control of hot air flow and temperature. By adjusting the opening of each branch, the central control module can flexibly control the distribution of hot air flow, ensuring uniform distribution of hot air in the branch air ducts and avoiding localized poor drying or overheating caused by uneven hot air distribution, significantly improving drying uniformity and finished product quality. Attached Figure Description

[0012] Figure 1 This is a diagram of the overall architecture of the present invention; Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] like Figure 1 As shown: A hot air circulation system includes a data acquisition component, a central control module, a variable frequency fan, a heating component, a primary circulation duct, a secondary circulation duct, and branch ducts; The outlet of the variable frequency fan is sequentially connected to the filter assembly, the primary circulation duct, the secondary circulation duct, and the branch duct. The outlet of the branch duct is used to output hot air. The variable frequency fan provides the necessary airflow support, and through its variable frequency adjustment function, the fan speed can be dynamically changed according to actual needs, thereby adjusting the airflow and achieving precise airflow control.

[0015] The heating component is located at the air inlet of the primary circulation duct and is used to heat the incoming natural air. This heating component heats the natural air flowing into the primary circulation duct using an electric heating element or other heating method, ensuring that the air entering the primary circulation duct has a suitable temperature to guarantee the accuracy of subsequent hot air flow and temperature.

[0016] Electric regulating valves are installed at the connections between the primary and secondary circulating air ducts, as well as at the connections between the secondary and branch air ducts, to regulate the hot air flow. These valves can be adjusted to control the airflow into different ducts, ensuring that the hot air flow in each duct meets the system requirements.

[0017] The data acquisition component includes multiple temperature sensors, which are respectively arranged in the primary circulation duct, secondary circulation duct, and each branch duct to collect temperature data at various locations. Each temperature sensor monitors the temperature changes in the duct in real time, and the data acquisition component transmits the collected temperature signals to the central control module for subsequent analysis and control.

[0018] The central control module is electrically connected to the variable frequency fan, heating assembly, and each electric regulating valve. Based on the temperature signal acquired by the data acquisition component, it dynamically adjusts the variable frequency fan speed, the power output of the heating assembly, and the opening degree of each electric regulating valve to achieve precise control of hot air temperature and flow rate. Through real-time connection with each component, the central control module automatically adjusts each stage of the system based on the temperature signal, ensuring that the temperature and flow rate of hot air within each duct meet the requirements.

[0019] Specifically, the central control module includes a storage module and a data analysis module. The storage module stores the target temperature range and control parameters, while the data analysis module analyzes the temperature signals acquired by the data acquisition components in real time and calculates and adjusts the operating parameters of the variable frequency fan, heating components, and electric regulating valves based on the deviation. The data analysis module quickly calculates adjustment strategies and dynamically adjusts the operating status of relevant equipment by comparing the deviation between the target temperature and the actual temperature in real time.

[0020] Specifically, each branch duct inlet is equipped with an independent electrically operated regulating valve. The central control module controls the opening of the corresponding electrically operated regulating valve based on the temperature signal collected by the temperature sensor of each branch duct, thereby achieving independent adjustment of the hot air temperature and flow rate of different branch ducts. This design allows each branch duct to independently adjust the hot air temperature and flow rate according to actual needs, improving the system's flexibility and adaptability. For example, in some applications with high temperature requirements, the central control module can independently adjust the temperature of a certain branch duct without affecting other branch ducts.

[0021] Specifically, the data acquisition components also include an ambient temperature sensor and a wind speed sensor, respectively located at the air inlet of the primary circulation duct. The central control module dynamically adjusts the power output of the heating components and the speed of the variable frequency fan based on the ambient temperature and wind speed signals to compensate for the impact of external environmental changes on the system's hot air output. The ambient temperature and wind speed sensors monitor changes in the external environment in real time, and the central control module automatically adjusts the system operating parameters based on these changes to ensure that even under conditions of significant environmental changes, the system can still stably output hot air and maintain the target temperature and flow rate.

[0022] like Figure 2 As shown, the specific technical solution for a control method of a hot air circulation system is as follows: A control method for a hot air circulation system includes the following steps: S1: The data acquisition component collects real-time temperature data of the corresponding air ducts through temperature sensors of the primary circulating air duct, secondary circulating air duct and branch air duct, and transmits the temperature data to the central control module. S2: The central control module adjusts the speed of the variable frequency fan, the power output of the heating components, and the opening degree of the electric regulating valve at each air duct inlet according to the collected temperature data. S2 specifically includes: S2-1: The heating component in the primary circulating air duct adjusts its output power according to the real-time data from the inlet temperature sensor to ensure that the hot air temperature reaches the preset range. S2-2: The electric regulating valve at the inlet of the secondary circulation duct adjusts its opening according to the temperature data of the primary circulation duct to control the flow rate of hot air entering the secondary circulation duct; S2-3: The variable frequency fan dynamically adjusts the airflow speed in the duct based on real-time data from the secondary circulation duct temperature sensor.

[0023] S3: The central control module uses temperature sensors in the branch ducts to detect the temperature difference at the branch outlets in real time, and dynamically adjusts the opening of the electric regulating valves of each branch according to the temperature requirements to output hot air at different temperatures. In S3, differentiated hot air output is achieved through temperature control of the branch ducts, specifically including: S3-1: The central control module calculates the target temperature difference of each branch duct based on the temperature sensor data at the outlet of the branch duct. S3-2: The electric regulating valves at the inlet of each branch air duct are set according to the target temperature to adjust the flow rate and proportion of the incoming hot air and output hot air at different temperatures; S3-3: Through the secondary return pipe, some hot air is introduced into the secondary circulation duct to achieve temperature rebalancing.

[0024] S4: When the data acquisition component detects that the temperature deviation exceeds the set range, the central control module triggers the abnormal handling program, adjusts the fan speed and heating power, and records the abnormal data; In step S4, the exception handling procedure includes the following steps: S4-1: When the temperature deviation in any air duct exceeds the target range, the central control module analyzes the real-time data collected by the temperature sensor to locate the specific air duct with the temperature deviation and its location, and confirms the degree of deviation between the deviation value and the target range. S4-2: Based on the magnitude of the deviation, the central control module reduces the speed of the variable frequency fan in stages to slow down the airflow and prevent abnormal hot air from spreading to other air ducts. S4-3: The central control module dynamically adjusts the power output of the heating components based on the deviation data, prioritizing the reduction of the overall temperature of the hot air in the primary circulating air duct to ensure that the temperature quickly returns to the target range; S4-3: The central control module records the deviation range, adjustment strategy, and real-time temperature change data to the control log.

[0025] S5: When shutdown is required, the central control module gradually reduces the fan speed and heating power, and closes the electric regulating valve.

[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hot air circulation system, characterized in that: It includes data acquisition components, a central control module, a variable frequency fan, a heating component, a primary circulating air duct, a secondary circulating air duct, and branch air ducts; The outlet of the variable frequency fan is connected in sequence to the filter assembly, the primary circulation duct, the secondary circulation duct and the branch duct, and the outlet of the branch duct is used to output hot air. The heating component is located at the air inlet of the primary circulating air duct and is used to heat the incoming natural air. Electric regulating valves are installed at the connection between the primary circulation duct and the secondary circulation duct, and at the connection between the secondary circulation duct and the branch duct, to regulate the hot air flow. The data acquisition component includes multiple temperature sensors, which are respectively arranged in the primary circulation duct, the secondary circulation duct and each branch duct, for collecting temperature data at various locations. The central control module is electrically connected to the variable frequency fan, heating component, and each electric regulating valve. It is used to dynamically adjust the speed of the variable frequency fan, the power output of the heating component, and the opening degree of each electric regulating valve according to the temperature signal collected by the data acquisition component, so as to achieve precise control of hot air temperature and flow rate.

2. The hot air circulation system according to claim 1, characterized in that: The central control module includes a storage module and a data analysis module. The storage module is used to save the target temperature range and control parameters, and the data analysis module is used to analyze the temperature signals collected by the data acquisition component in real time, and to calculate and adjust the operating parameters of the variable frequency fan, heating component and electric regulating valve according to the deviation.

3. The hot air circulation system according to claim 2, characterized in that: Each branch duct inlet is equipped with an independent electric regulating valve. The central control module controls the opening of the corresponding electric regulating valve according to the temperature signal collected by the temperature sensor of the branch duct, so as to realize the independent adjustment of the hot air temperature and flow rate of different branch ducts.

4. The hot air circulation system according to claim 3, characterized in that: The data acquisition component also includes an ambient temperature sensor and a wind speed sensor, which are respectively arranged at the air inlet of the primary circulation duct. The central control module dynamically adjusts the power output of the heating component and the speed of the variable frequency fan according to the ambient temperature and wind speed signals to compensate for the impact of external environmental changes on the system's hot air output.

5. The control method for a hot air circulation system according to claim 4, characterized in that: Includes the following steps: S1: The data acquisition component collects real-time temperature data of the corresponding air ducts through temperature sensors of the primary circulating air duct, secondary circulating air duct and branch air duct, and transmits the temperature data to the central control module. S2: The central control module adjusts the speed of the variable frequency fan, the power output of the heating components, and the opening degree of the electric regulating valve at each air duct inlet according to the collected temperature data. S3: The central control module uses temperature sensors in the branch ducts to detect the temperature difference at the branch outlets in real time, and dynamically adjusts the opening of the electric regulating valves of each branch according to the temperature requirements to output hot air at different temperatures. S4: When the data acquisition component detects that the temperature deviation exceeds the set range, the central control module triggers the abnormal handling program, adjusts the fan speed and heating power, and records the abnormal data; S5: When shutdown is required, the central control module gradually reduces the fan speed and heating power, and closes the electric regulating valve.

6. The control method for a hot air circulation system according to claim 5, characterized in that: S2 specifically includes: S2-1: The heating component in the primary circulating air duct adjusts its output power according to the real-time data from the inlet temperature sensor to ensure that the hot air temperature reaches the preset range. S2-2: The electric regulating valve at the inlet of the secondary circulation duct adjusts its opening according to the temperature data of the primary circulation duct to control the flow rate of hot air entering the secondary circulation duct; S2-3: The variable frequency fan dynamically adjusts the airflow speed in the duct based on real-time data from the secondary circulation duct temperature sensor.

7. The control method for a hot air circulation system according to claim 6, characterized in that: In S3, differentiated hot air output is achieved through temperature control of the branch ducts, specifically including: S3-1: The central control module calculates the target temperature difference of each branch duct based on the temperature sensor data at the outlet of the branch duct. S3-2: The electric regulating valves at the inlet of each branch air duct are set according to the target temperature to adjust the flow rate and proportion of the incoming hot air and output hot air at different temperatures; S3-3: Through the secondary return pipe, some hot air is introduced into the secondary circulation duct to achieve temperature rebalancing.

8. The control method for a hot air circulation system according to claim 6, characterized in that... ： The control method for a hot air circulation system according to claim 7 is characterized in that: In step S4, the exception handling procedure includes the following steps: S4-1: When the temperature deviation in any air duct exceeds the target range, the central control module analyzes the real-time data collected by the temperature sensor to locate the specific air duct with the temperature deviation and its location, and confirms the degree of deviation between the deviation value and the target range. S4-2: Based on the magnitude of the deviation, the central control module reduces the speed of the variable frequency fan in stages to slow down the airflow and prevent abnormal hot air from spreading to other air ducts. S4-3: The central control module dynamically adjusts the power output of the heating components based on the deviation data, prioritizing the reduction of the overall temperature of the hot air in the primary circulating air duct to ensure that the temperature quickly returns to the target range; S4-3: The central control module records the deviation range, adjustment strategy, and real-time temperature change data to the control log.

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