Temperature and humidity gradient inductive air duct self-adjusting industrial variable frequency air conditioning system

Abstract

This application relates to the field of industrial air conditioning, specifically a temperature and humidity gradient sensing-based self-regulating industrial variable frequency air conditioning system. The system includes an outdoor heat exchange unit, a refrigeration unit, a multi-stage air duct delivery unit, a terminal airflow regulation unit, a distributed environmental sensing unit, and a core controller. The outdoor heat exchange unit is coupled to the refrigeration unit via a circulating refrigerant pipeline, and its core function is to exhaust the heat generated by the refrigeration unit to the outdoor environment to cool the circulating refrigerant. The refrigeration unit includes a compressor, a variable frequency drive motor to drive the compressor, and cold air outlets for generating cool air. This system aims to acquire temperature and humidity gradient information for different areas within the factory through a distributed environmental sensing network, and, combined with the system's own operational status data, to perform multi-stage coordinated closed-loop regulation of airflow distribution, airflow direction, and cooling power. This achieves efficient, uniform, and adaptive control of the temperature and humidity field within the factory space, and improves the system's overall energy efficiency and operational stability.

Description

Technical Field

[0001] This application relates to the field of industrial air conditioning, and in particular to a temperature and humidity gradient sensing type self-regulating industrial variable frequency air conditioning system. Background Technology

[0002] In industrial environments, especially in production, manufacturing, or storage facilities with strict temperature and humidity requirements, variable frequency industrial air conditioning systems are crucial for maintaining environmental stability. These systems typically use variable frequency technology to adjust the output power of the compressor and fan, achieving overall control over cooling / heating capacity and airflow. At the data acquisition level, a common approach is to rely on data from a limited number of temperature and humidity sensors placed near the air conditioning system's return air vents or installed at representative work points. This data serves as the primary input parameters for system operation, used to adjust the overall temperature and humidity output levels. Compared to fixed-frequency air conditioners, this method offers improvements in energy efficiency and dynamic response.

[0003] However, existing technologies exhibit significant performance deficiencies in practical applications, especially in large industrial plants with vast spaces, complex layouts, or significant temperature and humidity gradients. These shortcomings are mainly reflected in two aspects:

[0004] First, the core environmental information collection method has inherent biases. Placing sensors primarily at return air vents or localized work points results in data that is essentially a localized, mixed environmental "average," or merely the state of a few specific points. It cannot accurately reflect the complex and variable temperature and humidity distribution throughout the entire space, especially in areas far from air outlets, areas with dense equipment generating additional heat and humidity loads, and areas prone to airflow dead zones such as factory rooftops or corners. This control strategy, based on incomplete and inaccurate information, leaves the system "blind" or "semi-blind" to the true temperature and humidity gradient changes in the space (i.e., the actual differences in temperature and humidity at different locations). Second, the air supply strategy fails to achieve precise regional adjustment.

[0005] Traditional industrial precision air conditioning systems, regardless of how their refrigeration units are frequency-controlled, typically lack the ability to effectively respond to the differentiated needs of different areas when distributing the conditioned air (cold / hot air, dehumidified / humidified air) through the air ducts.

[0006] Most systems employ fixed-design ductwork or dampers / valvees with limited adjustment capabilities and simple zoning, essentially adopting a "one-size-fits-all" air supply mode. Their air supply is spatially coarse, unable to sense or proactively adapt to differentiated and dynamically changing needs, such as area A requiring more cooling while area B requires only a small amount or none. This lack of spatial awareness and fine-tuning of terminal air supply results in the following: although the inverter in the main unit strives to adjust to a potentially distorted target value (from return air or a few point sensors), widespread localized areas remain excessively cold, hot, humid, or dry in the actual environment. When attempting to compensate for these unevennesses, the system frequently experiences control oscillations, frequent starts, stops, or significant output adjustments. This not only significantly increases the system's ineffective energy consumption but also makes it difficult to achieve the required uniformity and stability of temperature and humidity throughout the plant environment for demanding industrial environments.

[0007] Therefore, developing a new type of variable frequency industrial air conditioning system that can overcome the limitations of existing data acquisition methods, accurately sense the spatial temperature and humidity gradient distribution, and accordingly realize the precise and intelligent allocation of air supply volume by region has urgent practical needs and technical value. Utility Model Content

[0008] The purpose of this application is to overcome at least one deficiency in the existing technology and provide a temperature and humidity gradient sensing-based self-regulating industrial variable frequency air conditioning system. This system aims to acquire temperature and humidity gradient information of different areas within a factory through a distributed environmental sensor network, and combine this information with the system's own operational status data to perform multi-level coordinated closed-loop regulation of airflow distribution, airflow direction, and cooling power. This achieves efficient, uniform, and adaptive control of the temperature and humidity field within the factory space, and improves the system's overall energy efficiency and operational stability.

[0009] To achieve the above objectives, this application discloses a temperature and humidity gradient sensing type self-regulating industrial variable frequency air conditioning system, which includes an outdoor heat exchange unit, a refrigeration unit, a multi-stage air duct delivery unit, a terminal airflow regulation unit, a distributed environmental sensing unit, and a core controller.

[0010] The outdoor heat exchange unit is coupled to the refrigeration main unit via a refrigerant circulation pipeline. Its core function is to exhaust the heat generated by the refrigeration main unit to the outdoor environment, thereby cooling the circulating refrigerant. The refrigeration main unit includes a compressor unit, a variable frequency drive motor to drive the compressor unit, and cold air vents for generating cold air. Specifically, to improve the flexibility and reliability of power regulation, the compressor unit is preferably configured as two independent compressor units connected in parallel, each driven by an independent variable frequency drive motor. The start-stop and operating frequency of each variable frequency drive motor are individually controlled by the core controller, thereby enabling fine-tuning of the overall cooling power of the system.

[0011] The multi-stage air duct delivery unit consists of one or more main air ducts connected to the cold air inlets and multiple branch air ducts connected to each main air duct. A first-stage airflow regulating valve is installed at the connection between the cold air inlet and the main air duct; and a second-stage airflow regulating valve is installed at the connection between each main air duct and its corresponding branch air duct. Both the first-stage and second-stage airflow regulating valves are controlled by the core controller, receiving and executing its opening, closing, or opening degree adjustment commands to precisely distribute the cold air flow at the main and branch air duct levels. Furthermore, a first-stage temperature sensor and a first-stage humidity sensor are fixedly installed inside the cold air inlet to monitor the output temperature and humidity parameters of the cold air in real time; second-stage temperature sensors and second-stage humidity sensors are respectively installed inside each branch air duct to monitor the instantaneous temperature and humidity status of the cold air flowing through each branch air duct. All of the aforementioned first-stage and second-stage temperature and humidity sensors are communicatively connected to the core controller.

[0012] The terminal airflow regulating unit consists of multiple terminal air duct components, each receiving cold air via a corresponding branch air duct. Each terminal air duct component includes a main body that guides the airflow direction, an axial flow fan installed inside the main body to enhance airflow output, and an active air guide plate mechanism installed at the air outlet of the main body. The active air guide plate mechanism integrates an actuator motor, which drives the air guide plate to adjust its angle or position under the command of the core controller, thereby dynamically changing the air outlet direction and airflow coverage.

[0013] The distributed environmental sensing unit includes multiple third-level temperature and humidity sensors. These sensors are fixedly installed in key areas or locations within the industrial plant in a spatially gradient distribution pattern, comprehensively covering the entire controlled space. Each third-level temperature and humidity sensor establishes a real-time communication connection with the core controller via a wired or wireless data transmission link, periodically or upon request sending the ambient temperature and humidity measurements of its local area to the core controller, providing the controller with real-time monitoring data of the macroscopic temperature and humidity field distribution within the plant.

[0014] To comprehensively monitor system operation and achieve more accurate energy consumption management and fault early warning, the inverter drive motor of the refrigeration unit integrates current and voltage sensors for detecting its operating current and voltage. Similarly, the cooling fan of the outdoor heat exchange unit is also equipped with current and voltage sensors for detecting its operating current and voltage. All of these current and voltage sensors maintain a communication connection with the core controller, continuously uploading the collected current and voltage data to the core controller.

[0015] Compared with the prior art, this application has at least one of the following beneficial technical effects:

[0016] 1. Improve the uniformity of temperature and humidity in the space: Based on the temperature and humidity gradient information of the entire factory area obtained by the distributed environmental sensing unit, combined with the coordinated control of multi-stage air volume regulating valves and terminal airflow regulating units, the air supply regulation of different areas can be accurately adjusted, effectively eliminating local overcooling, overheating, overhumidification or overdryness.

[0017] 2. Achieve precise air volume distribution on demand: The core controller independently and dynamically controls the opening of the second-stage air volume regulating valve on the branch duct according to the actual needs of each area, ensuring that the cooling capacity is delivered to the required area on demand, avoiding the energy waste caused by the rough distribution of traditional duct systems.

[0018] 3. Optimize system energy efficiency and operational stability: Based on global perception and multi-level closed-loop coordinated adjustment (air volume, air outlet direction, cooling power) and monitoring of the operating status of key components, it effectively reduces ineffective energy consumption, reduces frequent start-ups or oscillations of equipment, improves overall energy efficiency and enhances the long-term operational reliability of the system.

[0019] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0020] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0021] Figure 1 This is a hardware connection block diagram of one embodiment disclosed in this application. Detailed Implementation

[0022] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0023] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0024] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0025] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0026] This embodiment uses a printing plant workshop as an example to detail the specific implementation of a temperature and humidity gradient sensing-based self-regulating industrial variable frequency air conditioning system. Printing plant workshops are typically divided into multiple functional areas, including areas for large printing presses, paper cutting machines, and personnel operating areas. The heat generation of machinery and equipment in different areas varies significantly, and their requirements for temperature and humidity control also differ.

[0027] See attached document Figure 1 This embodiment includes an outdoor heat exchange unit 1 and a refrigeration unit 2, wherein the outdoor heat exchange unit 1 is coupled to the refrigeration unit 2 through a circulating refrigerant pipeline. The core function of the outdoor heat exchange unit 1 is to dissipate the heat generated by the refrigeration unit 2 to the outdoor environment, thereby achieving cooling of the circulating refrigerant.

[0028] The refrigeration unit 2 includes a compressor unit 201, a variable frequency drive motor for driving the compressor unit 201, and a cold air outlet 202 for generating cold air. The compressor unit 201 is configured as two independent compressor units connected in parallel, each compressor unit being driven by an independent variable frequency drive motor. The start-stop and operating frequency of each variable frequency drive motor are individually controlled by the core controller 3, thereby finely adjusting the overall cooling power of the system. The selection, installation, and control methods of the variable frequency drive motor adopt existing technologies known to those skilled in the art.

[0029] This embodiment also includes a multi-stage air duct conveying unit 4. Specifically, the multi-stage air duct conveying unit 4 consists of one or more main air ducts 401 connected to the cold air outlet 202 and multiple branch air ducts 402 connected to each main air duct 401. For example, the main air duct 401 has a rectangular cross-section with dimensions of 500mm × 300mm and is made of galvanized steel plate with a thickness of 1.2mm to ensure sufficient strength and rigidity; the branch air ducts 402 have a circular cross-section with a diameter of 250mm and are also made of galvanized steel plate with a thickness of 1.0mm to reduce air duct resistance and ensure airflow conveying efficiency.

[0030] A first-stage airflow regulating valve 403 is installed at the connection between the cold air outlet 202 and the main air duct 401; a second-stage airflow regulating valve 404 is installed at the connection between each main air duct 401 and its corresponding branch air duct 402. Both the first-stage airflow regulating valve 403 and each of the second-stage airflow regulating valves 404 are controlled by the core controller 3, receiving and executing its opening, closing, or opening degree adjustment commands, thereby precisely distributing the cold air flow at the main air duct 401 and branch air duct 402 levels. The airflow regulating valves are electrically operated butterfly valves, and their structure and control method are well-known technologies in the field; for details not described in detail, please refer to relevant existing technical documents.

[0031] A first-stage temperature sensor 2021 and a first-stage humidity sensor 2022 are fixedly installed inside the cold air outlet 202 to monitor the output temperature and humidity parameters of the cold air in real time. Second-stage temperature sensors 4021 and second-stage humidity sensors 4022 are respectively installed inside each branch air duct 402 to monitor the instantaneous temperature and humidity of the cold air flowing through each branch air duct 402. All of the above-mentioned first-stage and second-stage temperature and humidity sensors are communicatively connected to the core controller 3. The temperature sensors are resistance temperature sensors, for example, with an accuracy of ±0.5℃; the humidity sensors are capacitive humidity sensors with an accuracy of ±3%RH. The installation position and method of the sensors are implemented in accordance with relevant standards and specifications to ensure the accuracy and reliability of the measurement data.

[0032] This embodiment also includes a terminal airflow regulating unit 5, which is composed of multiple terminal air duct assemblies 501. Each terminal air duct assembly 501 receives cold air via a corresponding branch air duct 402. Each terminal air duct assembly 501 includes a body with a specific shape to guide the airflow direction, an axial flow fan installed inside the body to enhance airflow output, and an active air guide plate mechanism installed at the air outlet of the body.

[0033] The terminal duct assembly 501 features a streamlined design with a smooth internal surface to reduce airflow resistance and guide airflow direction. The body is made of ABS engineering plastic, offering good mechanical strength and corrosion resistance. More specifically, the axial flow fan can be an external rotor type, for example, with a rated airflow of 1500 m³ / h and a rated power of 120 W. Its blades are made of high-polymer composite materials, exhibiting high aerodynamic performance and low noise characteristics. The installation method and electrical connection of the axial flow fan utilize conventional techniques in the art.

[0034] The active air guide vane mechanism integrates an actuator motor, which, under the command of the core controller, drives the air guide vane to adjust its angle or position, thereby dynamically changing the air outlet direction and airflow coverage. The actuator motor is a DC brushed motor with a rated voltage of 24V and a rated torque of 0.5 N·m, capable of precisely controlling the angle changes of the air guide vane. The air guide vane is made of aluminum alloy with an anodized surface, providing excellent wear and corrosion resistance. The hinge structure and transmission mechanism of the air guide vane utilize existing technologies known in the art; for details not described in detail, please refer to relevant mechanical design manuals.

[0035] This embodiment also includes a distributed environmental sensing unit 6, which comprises multiple third-level temperature sensors 601 and third-level humidity sensors 602. These sensors are fixedly installed in various key areas or locations within the printing plant workshop in a spatial gradient distribution, comprehensively covering the entire controlled space. For example, specific installation locations could be: in the large printing press area, one third-level temperature sensor 601 and one third-level humidity sensor 602 are installed every 5m × 5m, for a total of 6; in the paper cutter area, one third-level temperature sensor 601 and one third-level humidity sensor 602 are installed every 8m × 8m, for a total of 3; in the personnel operation area, one third-level temperature sensor 601 and one third-level humidity sensor 602 are installed near each operating station, for a total of 10.

[0036] Each of the third-level temperature sensors 601 and the third-level humidity sensors 602 establishes a real-time communication connection with the core controller 3 through a wired data transmission link. For example, the RS-485 communication protocol is used with a communication baud rate of 9600bps. The data line uses shielded twisted-pair cable to reduce electromagnetic interference and ensure the stability and reliability of data transmission.

[0037] In this embodiment, the core controller 3 uses an industrial-grade PLC (Programmable Logic Controller), which possesses powerful data processing capabilities and real-time control functions. For example, the selected PLC is a Siemens S7-1200 series, equipped with multiple input / output ports to meet the connection requirements of various sensors and actuators in the system. The core controller 3 has a reserved interface for communication with a host computer, which can upload system operating data to the host computer monitoring software in real time, enabling remote monitoring and management.

[0038] To comprehensively understand the system's operating status and achieve more accurate energy consumption management and fault early warning, the inverter drive motor of the refrigeration unit 2 integrates current and voltage sensors for detecting its operating current and voltage. Correspondingly, the cooling fan of the outdoor heat exchange unit 1 is also equipped with current and voltage sensors for detecting its operating current and voltage. All of the aforementioned current and voltage sensors maintain a communication connection with the core controller 3, continuously uploading the collected current and voltage data to the core controller 3. For example, the current sensor is a Hall effect current sensor with a range of 0-100A and an accuracy of ±1%; the voltage sensor is a resistance voltage divider type voltage sensor with a range of 0-500V and an accuracy of ±1%. The sensor installation method and electrical connection adopt conventional techniques in this field.

[0039] The system operation process and control logic in this embodiment are as follows: Before system startup, based on the production process requirements of the printing plant workshop, the target temperature and humidity ranges for each area are pre-set in the core controller: Large printing press area: temperature 22℃±2℃, humidity 50%RH±5%RH; Paper cutter area: temperature 24℃±2℃, humidity 55%RH±5%RH; Personnel operation area: temperature 26℃±2℃, humidity 60%RH±5%RH. Simultaneously, the initial operating parameters for each piece of equipment are set:

[0040] The initial operating frequencies of the two compressor units of the refrigeration unit 2 are 50Hz and 45Hz, respectively; the initial opening degree of each first-stage air volume regulating valve 403 and second-stage air volume regulating valve 404 is 50%; the initial speed of the axial flow fan in the terminal air duct assembly is 800r / min, and the initial angle of the air guide plate is 0° (i.e., vertically upward).

[0041] After the system starts up, the third-level temperature and humidity sensors of the distributed environmental sensing unit 6 begin to monitor the temperature and humidity data of each area in the workshop in real time, and upload the data to the core controller 3 at set time intervals (e.g., every 30 seconds). The core controller 3 analyzes and processes the collected data, and adjusts each component in real time according to the deviation between the actual temperature and humidity of each area and the target temperature and humidity, based on the preset control strategy.

[0042] Based on temperature and humidity data from each area, the core controller 3 calculates the average cooling load demand for the entire workshop. When the average cooling load demand increases, the core controller 3 gradually increases the operating frequency of the variable frequency drive motors of the two compressor units, increasing the cooling capacity output of the refrigeration unit 2; conversely, when the average cooling load demand decreases, the core controller 3 gradually decreases the operating frequency of the variable frequency drive motors, reducing the cooling capacity output. During the control process, the core controller 3 always ensures that the operating frequency difference between the two compressor units does not exceed 10Hz, in order to achieve balanced cooling and extend the service life of the equipment.

[0043] For example, when the temperature rises in the area of ​​a large printing press due to the high-speed operation of the equipment, and the third-level temperature sensor 601 detects that the temperature in the area exceeds the target upper limit of 24°C, the core controller 3 calculates the required increase in cooling capacity based on factors such as the area of ​​the area, the heat generated by the equipment, and the number of personnel, and accordingly increases the operating frequency of the variable frequency drive motor of the compressor unit in the refrigeration host unit 2 that is responsible for cooling the area, with each adjustment increment being 5Hz, until the temperature in the area falls back to the target range.

[0044] Meanwhile, the current and voltage sensors of the refrigeration unit 2 monitor the operating current and voltage of the variable frequency drive motor in real time and upload the data to the core controller 3. The core controller 3 determines whether the variable frequency drive motor is operating normally based on the current and voltage data. When the motor current exceeds 120% of the rated current or the voltage fluctuates abnormally (e.g., the voltage exceeds ±10% of the rated voltage), the core controller 3 immediately issues an alarm signal and takes corresponding protective measures, such as reducing the motor's operating frequency or shutting down the motor, to prevent equipment damage.

[0045] Specifically, the multi-stage air duct delivery unit 5 is controlled by the core controller 3, which precisely controls the first-stage air volume regulating valve 403 and the second-stage air volume regulating valve 404 based on the temperature and humidity data and equipment operating parameters of each area, so as to achieve the reasonable distribution of cold air in different areas.

[0046] For the large printing press area, when the third-level temperature and humidity sensor detects that the temperature or humidity in the area exceeds the target range, the core controller 3 calculates the required increase in cold air volume according to the preset air volume distribution algorithm, and accordingly increases the opening of the first-level air volume regulating valve 403 at the cold air outlet 202, while simultaneously increasing the opening of the second-level air volume regulating valve 303 in the corresponding branch air duct 302, so that more cold air is delivered to the area. For example, initially, the opening of the first-level air volume regulating valve 403 is 50%. When an increase in cold air volume is required, the core controller 3 adjusts its opening to 60%, and simultaneously adjusts the opening of the second-level air volume regulating valve 404 in the corresponding branch air duct 402 from 50% to 55%, to ensure that the cold air can accurately and quickly reach the large printing press area to meet its cooling needs.

[0047] During the adjustment process, the core controller 3 comprehensively considers the priority of airflow demand in each area. The large printing press area, due to its high heat generation and critical impact on the production process, is set as the highest priority; the personnel operation area is next; and the paper cutter area is relatively the lowest. When the total supply of cold air is insufficient, the core controller 3 prioritizes ensuring airflow supply to high-priority areas, appropriately reducing airflow to low-priority areas, but ensuring that the airflow in each area is not lower than its minimum operating requirement (for example, the minimum airflow in the large printing press area is 30% of the design airflow, in the personnel operation area it is 40%, and in the paper cutter area it is 20%).

[0048] Meanwhile, temperature and humidity sensors installed in the cold air inlet 202 and branch duct 402 monitor the temperature and humidity changes of the cold air in real time. When the cold air temperature or humidity is too high or too low, the core controller 3 promptly adjusts the operating parameters of the refrigeration unit 2, such as the compressor operating frequency and refrigerant flow rate, to ensure that the temperature and humidity of the cold air delivered to each area meet the design requirements. For example, when the first-stage temperature sensor detects that the cold air temperature is lower than the set low temperature limit (e.g., 16°C), the core controller 3 appropriately reduces the compressor operating frequency of the refrigeration unit 2, reduces the cooling output, and allows the cold air temperature to rise back to a suitable range, avoiding excessive cooling that could adversely affect the equipment and the production environment.

[0049] The active air guide plate mechanism and axial flow fan of the terminal airflow regulating unit 5 adjust the air outlet direction and airflow output characteristics in real time according to the instructions of the core controller 3, so as to meet the personalized needs of different areas.

[0050] In the area of ​​a large printing press, due to the concentrated and uneven heat generation, the core controller 3 dynamically adjusts the angle of the air guide plate and the speed of the axial fan in the terminal air duct assembly 501 based on data from the third-level temperature and humidity sensors in this area and the operating status information of the equipment (such as the printing press's speed and power). For example, when the heat generation in a certain part of the printing press suddenly increases, causing the surrounding temperature to rise, the core controller 3 controls the corresponding air guide plate to rotate a certain angle (e.g., 30°) towards the heat source, while simultaneously increasing the speed of the axial fan to 1000 r / min, so that cool air can be blown directly and quickly towards the heat source for precise cooling. The angle adjustment range of the air guide plate is 0°-90°, with each adjustment step being 5°, ensuring a smooth and precise adjustment process.

[0051] In the paper cutter area, where heat generation is relatively low and uniform, the core controller 3 adjusts the angle of the air guide plate and the speed of the axial fan in the terminal air duct assembly 501 based on the overall temperature and humidity conditions and personnel distribution. For example, when the humidity in the area is slightly higher than the target upper limit, the core controller 3 appropriately increases the angle of the air guide plate to allow cool air to cover a wider area, promoting air circulation and reducing humidity. Simultaneously, the speed of the axial fan is fine-tuned according to actual needs, generally varying between 600 r / min and 800 r / min to maintain a suitable airflow speed and coverage.

[0052] Furthermore, the core controller 3 also features data recording and storage capabilities, enabling it to store data collected by various sensors and system operating parameters in real time, with a storage period of no less than one month. By analyzing historical data, the core controller 3 can identify patterns and trends in temperature and humidity changes within the workshop, providing a basis for optimizing control strategies. For example, after accumulating operating data over a period of time, the core controller 3 discovers that the temperature in the large printing press area rises rapidly at the initial startup each morning. At this time, the operating parameters of the refrigeration unit 2 and the airflow distribution of the multi-stage air duct conveying unit 5 can be adjusted in advance, allowing the system to reach a stable operating state more quickly after startup and improving production efficiency.

[0053] In summary, the application of the temperature and humidity gradient sensing duct self-regulating industrial variable frequency air conditioning system in the printing plant workshop in this embodiment fully demonstrates its excellent temperature and humidity control performance, energy-saving effect and reliability, providing an effective solution for environmental control in industrial plants.

[0054] The above content provides a detailed description of the specific implementation of this embodiment in a printing plant workshop, including system composition, the connection relationships between various parts, the control logic during operation, and the implementation effects, ensuring that those skilled in the art can understand and implement this embodiment. For parts not described in detail, such as the specific control algorithm of the core controller and the installation details of the sensors, these are well-known and existing technologies to those skilled in the art, and will not be elaborated upon here.

[0055] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A temperature and humidity gradient sensing-type self-regulating industrial variable frequency air conditioning system, characterized in that, The system includes an outdoor heat exchange unit, a refrigeration unit, a multi-stage air duct delivery unit, a terminal airflow regulation unit, a distributed environmental sensing unit, and a core controller. The outdoor heat exchange unit is coupled to the refrigeration unit through a circulating refrigerant pipeline. Its core function is to exhaust the heat generated by the refrigeration unit to the outdoor environment in order to cool the circulating refrigerant. The refrigeration unit is equipped with a compressor, a variable frequency drive motor that drives the compressor, and a cold air outlet for generating cold air. The multi-stage air duct delivery unit consists of one or more main air ducts connected to the cold air inlet and multiple branch air ducts connected to each main air duct. A first-stage airflow regulating valve is installed at the connection between the cold air outlet and the main air duct; while a second-stage airflow regulating valve is installed at the connection between each main air duct and the corresponding branch air duct. The first-stage air volume regulating valve and each of the second-stage air volume regulating valves are controlled by the core controller, which receives and executes the opening, closing or opening degree adjustment commands issued by the controller, thereby accurately distributing the cold air flow at the main air duct and branch air duct levels. A first-stage temperature sensor and a first-stage humidity sensor are fixedly installed inside the cold air outlet to monitor the output temperature and humidity parameters of the cold air in real time. Second-stage temperature sensors and second-stage humidity sensors are respectively installed inside each branch air duct to monitor the instantaneous temperature and humidity status of the cold air flowing through each branch air duct. All of the above-mentioned first-level and second-level temperature and humidity sensors are communicatively connected to the core controller. The terminal airflow regulating unit consists of multiple terminal air duct components, and each terminal air duct component receives cold air through a corresponding branch air duct. Each terminal air duct assembly includes a body that guides the airflow direction, an axial fan installed inside the body to enhance airflow output, and an active air guide plate mechanism installed at the air outlet of the body; the active air guide plate mechanism integrates an actuator motor, which drives the air guide plate to adjust its angle or position under the command of the core controller. The distributed environmental sensing unit includes multiple third-level temperature sensors and third-level humidity sensors. Each third-level temperature sensor and third-level humidity sensor establishes a real-time communication connection with the core controller through a wired or wireless data transmission link.

2. The temperature and humidity gradient sensing type self-regulating industrial variable frequency air conditioning system as described in claim 1, characterized in that, The variable frequency drive motor of the refrigeration unit is equipped with a current sensor and a voltage sensor for detecting its operating current and voltage. Correspondingly, the cooling fan of the outdoor heat exchange unit is also equipped with a current sensor and a voltage sensor for detecting its operating current and voltage. All of the above current sensors and voltage sensors maintain a communication connection with the core controller and continuously upload the collected current and voltage data to the core controller.

3. The temperature and humidity gradient sensing type self-regulating industrial variable frequency air conditioning system as described in claim 1, characterized in that, The compressor unit is preferably configured as two independent compressor units connected in parallel, each compressor unit being driven by an independent variable frequency drive motor, and the start-stop and operating frequency of each variable frequency drive motor being individually controlled by the core controller.

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