An automatic differential pressure adjustment system for workshops

Abstract

This utility model discloses an automatic differential pressure adjustment system for workshops, including an air supply duct, a return air duct, a fan, a differential pressure gauge, a first electric regulating valve, a second electric regulating valve, and a controller. The fan delivers air to each workshop through the air supply duct. The return air duct is used to exhaust gas from each workshop. The differential pressure gauge extends into two workshops with different differential pressure requirements at both ends. The first electric regulating valve is installed on a branch of the air supply duct connecting to each workshop, and the second electric regulating valve is installed on a branch of the return air duct connecting to each workshop. The controller is signal-connected to the differential pressure gauge, the first electric regulating valve, and the second electric regulating valve. This automatic differential pressure adjustment system detects the workshop differential pressure signal in real time using the differential pressure gauge. The controller drives the first and / or second electric regulating valves to precisely adjust the differential pressure based on the differential pressure signal, achieving closed-loop automatic differential pressure control and replacing manual operation.

Description

Technical Field

[0001] This utility model relates to the field of workshop differential pressure regulation technology, and in particular to an automatic workshop differential pressure regulation system. Background Technology

[0002] In industries such as biopharmaceuticals, workshop cleanliness is crucial to product quality. Workshops with different cleanliness levels need to maintain a stable pressure differential gradient. For example, the first shoe changing room needs to maintain a +10 Pa pressure differential with the general area, the second changing room needs to maintain a +5 Pa pressure differential with the first changing room, the buffer room needs to maintain a +5 Pa pressure differential with the second changing room, and the production workshop needs to maintain a +10 Pa pressure differential with the buffer room. This pressure differential control effectively prevents contaminants from spreading from low-cleanliness areas to high-cleanliness areas, which is a core requirement for ensuring a safe production environment.

[0003] The current conventional technical solution involves installing manual airflow regulating valves at the supply and return air vents in each workshop. The supply and return air volumes are adjusted manually to control the pressure difference between workshops. However, this manual adjustment method has significant drawbacks: firstly, it is inefficient and reliant on manual labor, requiring repeated adjustments of multiple valves, which is time-consuming and labor-intensive; secondly, control accuracy cannot be guaranteed, as the lack of real-time feedback and precise actuators often leads to pressure deviations from the set value or even failure to meet standards, affecting the stability of the clean environment.

[0004] Therefore, there is an urgent need to design an automatic differential pressure adjustment system for workshops to solve the systemic defects of manual adjustment, such as low efficiency and poor accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic differential pressure adjustment system for workshops, which solves the problems of low efficiency and poor accuracy of existing manual adjustment.

[0006] To achieve this objective, the present invention adopts the following technical solution: An automatic differential pressure regulation system for workshops is applied to several workshops with differential pressure requirements. It includes an air supply duct, a return air duct, a fan, a differential pressure gauge, a first electric regulating valve, a second electric regulating valve, and a controller. The fan delivers air to each workshop through the air supply duct. The return air duct is used to exhaust gas from each workshop. The differential pressure gauge extends into two workshops with differential pressure requirements at both ends to detect the differential pressure between the two workshops. The first electric regulating valve is located on a branch of the air supply duct connecting to each workshop, and the second electric regulating valve is located on a branch of the return air duct connecting to each workshop. The controller is signal-connected to the differential pressure gauge, the first electric regulating valve, and the second electric regulating valve.

[0007] Furthermore, the controller is configured to independently select one of the following modes for each workshop: variable return air mode, variable supply air mode, and collaborative mode; When the workshop is in the variable return air mode, the first electric regulating valve is configured to be in a fixed opening state, and the second electric regulating valve is configured to be in a variable opening state. When the workshop is in variable air supply mode, the first electric regulating valve is configured to be in variable opening state, and the second electric regulating valve is configured to be in fixed opening state. When the workshop is in collaborative mode, both the first and second electric regulating valves are configured to be in a variable opening state.

[0008] Furthermore, each workshop door is equipped with an opening / closing detection switch connected to the controller signal; When the workshop door is open, the workshop is configured to be in collaborative mode; when the workshop door is closed, the workshop is configured to be in a set mode.

[0009] Furthermore, it also includes an integrated air control area, in which the air inlet of the supply air duct and the air outlet of the return air duct extend into the integrated air control area, and the fan is located in the integrated air control area and is directly opposite the air inlet of the supply air duct. The integrated air control area is equipped with a dehumidifier and a thermostat, which are located between the air inlet of the supply air duct and the air outlet of the return air duct.

[0010] Furthermore, a fresh air inlet is provided in the integrated air control area, and the fresh air inlet is located at one end of the air outlet near the return air duct; a third electric regulating valve is provided at the fresh air inlet; It also includes an exhaust duct connected to the return air duct, wherein a fourth electric regulating valve is installed on the exhaust duct; and a fifth electric regulating valve is installed at the air outlet of the return air duct. The controller is connected to the third, fourth, and fifth electric regulating valves.

[0011] Furthermore, the controller is configured to select one of the following modes: normal mode, ventilation mode, and energy-saving mode; When in normal mode, the third, fourth and fifth electric regulating valves are configured to be in the set opening state to deliver a mixture of fresh air and return air into the workshop. When in ventilation mode, the third and fourth electric regulating valves are configured to be in the open state, and the fifth electric regulating valve is configured to be in the closed state, so as to deliver fresh air into the workshop. When in energy-saving mode, the fifth electric regulating valve is configured to be open, the fourth electric regulating valve is configured to be closed, and the third electric regulating valve is configured to be closed or at its minimum opening, so as to deliver full return air or mixed air with a small amount of fresh air into the workshop.

[0012] Furthermore, a filter is installed in the integrated air control area, and the filter is located between the air inlet of the supply air duct and the air outlet of the return air duct.

[0013] Furthermore, constant air volume valves are also installed on the branch lines of the air supply duct that connect to each workshop.

[0014] Furthermore, both the first and second electric regulating valves are electric proportional integral valves; the controller is a PLC controller.

[0015] Furthermore, the third electric regulating valve is an electric split-leaf regulating valve; the fourth and fifth electric regulating valves are both electric proportional integral air valves.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The automatic differential pressure adjustment system for workshops described in this utility model uses a differential pressure gauge to detect the differential pressure signal in real time. The controller drives the first electric regulating valve on the supply air duct branch and / or the second electric regulating valve on the return air duct branch to synchronously and precisely adjust the opening degree according to the differential pressure signal, realizing closed-loop automatic control of differential pressure and replacing manual operation. The system uses a fan to stably deliver air source, and combines the dual electric valves to coordinate the distribution of supply and return air volume, ensuring fast differential pressure response, high control accuracy and continuous stability. Ultimately, it achieves fully automated, high-precision and high-reliability adjustment of the workshop differential pressure gradient.

[0017] Furthermore, in this invention, each workshop can independently select one of three modes: variable return air mode, variable supply air mode, or collaborative mode. Variable return air mode and variable supply air mode are suitable for scenarios where control precision requirements are not extremely high but system stability and energy efficiency are emphasized. These two modes simplify the control logic and reduce system complexity by fixing the valve opening of a single airflow channel, thereby achieving the advantages of stable operation, easier control, and lower energy consumption. Variable return air mode is suitable for stable supply air volume, while variable supply air mode is suitable for stable return air volume. Collaborative mode allows simultaneous adjustment of supply and return air volumes, achieving more precise differential pressure control, and is particularly suitable for workshops with strict differential pressure requirements or frequent environmental changes. The three modes enable personalized customization for each workshop, improving system flexibility and response speed, and optimizing energy utilization efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] Figure 1 This is a schematic diagram of the automatic differential pressure adjustment system in the workshop according to this utility model; Figure 2 This is a schematic diagram of the integrated risk control area described in this utility model; Figure 3 A schematic diagram of another automatic differential pressure adjustment system for a workshop provided by this utility model.

[0021] Diagram Explanation: 1. Workshop; 2. Supply air duct; 3. Return air duct; 4. Fan; 5. First electric regulating valve; 6. Second electric regulating valve; 7. PLC controller; 8. Differential pressure gauge; 9. Integrated air control zone; 10. Filter; 11. Fresh air inlet; 12. Third electric regulating valve; 13. Dehumidifier; 14. Thermostat; 15. Constant air volume valve; 16. Exhaust air duct; 17. Fourth electric regulating valve; 18. Fifth electric regulating valve. Detailed Implementation

[0022] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] The automatic differential pressure adjustment system described in this embodiment is applied to several workshops 1 with differential pressure requirements to meet the differential pressure gradient needs between different workshops 1. Combined with... Figure 1As shown, the workshop differential pressure automatic adjustment system includes an air supply duct 2, a return air duct 3, a fan 4, a differential pressure gauge 8, a first electric regulating valve 5, a second electric regulating valve 6, and a controller. The air supply duct 2 connects the fan 4 to each workshop 1, and the fan 4 delivers air to each workshop 1 through the air supply duct 2. The return air duct 3 connects each workshop 1 to the exhaust vent, used to exhaust gas from each workshop 1. The differential pressure gauge 8 extends into two workshops 1 with different pressure requirements at both ends, used to detect the pressure difference between the two workshops 1. By monitoring the pressure difference changes in real time, it serves as a feedback signal input for differential pressure control, providing a reference for the closed-loop control system. The first electric regulating valve 5 is located on a branch of the air supply duct 2 connecting to each workshop 1, used to adjust the air supply volume of each workshop 1; the second electric regulating valve 6 is located on a branch of the return air duct 3 connecting to each workshop 1, used to adjust the return air volume of each workshop 1, thereby assisting in differential pressure adjustment. Both the first electric regulating valve 5 and the second electric regulating valve 6 are electric proportional-integral valves, capable of continuous and precise valve opening adjustment with fast response and high control accuracy. The controller is signal-connected to the differential pressure gauge 8, the first electric regulating valve 5, and the second electric regulating valve 6, receives the detection signal from the differential pressure gauge 8, and outputs control commands according to preset logic to drive the first electric regulating valve 5 and the second electric regulating valve 6 to operate. The controller is a PLC controller 7, which uses its programmable logic and real-time computing capabilities to ensure automated system operation. In a specific embodiment, the controller is configured to allow each workshop 1 to independently select one of the following modes: variable return air mode, variable supply air mode, or collaborative mode. By allowing different workshops 1 to independently select different operating modes, the system can flexibly adjust the airflow control strategy according to the actual needs of each workshop 1. The variable return air mode focuses on stabilizing the differential pressure by adjusting the return air volume, the variable supply air mode focuses on responding to changes by adjusting the supply air volume, and the collaborative mode combines both to achieve more precise control, thereby improving the system's adaptability and control accuracy. When workshop 1 is in variable return air mode, the first electric regulating valve 5 is configured to be in a fixed opening state, and the second electric regulating valve 6 is configured to be in a variable opening state. In this mode, by fixing the supply air volume and dynamically adjusting the return air volume, the supply air stability is maintained. This is suitable for situations where the pressure inside the workshop is high and a stable pressure difference needs to be maintained, or where a small amount of gas needs to be discharged to maintain air quality, and where the pressure difference fluctuation in the workshop is small, such as when equipment is running smoothly and there is little personnel activity. When workshop 1 is in variable supply air mode, the first electric regulating valve 5 is configured to be in a variable opening state, and the second electric regulating valve 6 is configured to be in a fixed opening state. By dynamically adjusting the supply air volume and fixing the return air volume, the return air stability is maintained. This is suitable for situations where the return air volume needs to be kept constant and there is a need for supply air changes, such as when the pressure inside the workshop is low and fresh air needs to be supplemented, or when a small amount of fresh air needs to be introduced to balance the pressure difference, and where the pressure difference fluctuation in the workshop is small.When workshop 1 is in collaborative mode, both the first electric regulating valve 5 and the second electric regulating valve 6 are configured to be in a variable opening state. Collaborative mode allows for simultaneous adjustment of supply and return air volumes, achieving more precise differential pressure control, which is particularly suitable for workshops with strict differential pressure requirements or frequent environmental changes. The flexible switching between the three modes enables the system to cope with different operating conditions. Variable return air mode and variable supply air mode are suitable for scenarios where control precision requirements are not extremely high but system stability and energy efficiency are emphasized. This is because these two modes simplify the control logic and reduce system complexity by fixing the valve opening of one air volume channel, thereby achieving the advantages of stable operation, easier control, and lower energy consumption. Variable return air mode is suitable for stable supply air volume, variable supply air mode is suitable for stable return air volume, and collaborative mode is suitable for high-precision control. However, collaborative mode is more difficult to control and consumes more energy because it requires coordinating the dynamic adjustment of two valves, thereby improving the overall efficiency and reliability of the system. Each workshop 1 door is equipped with an opening / closing detection switch connected to the controller signal. This switch monitors the door's opening / closing status in real time, providing the controller with a door status signal to automatically adjust the operating mode. In specific embodiments, the opening / closing detection switch can be one of common types, such as a magnetic switch or an infrared sensor, capable of reliably detecting the door's opening / closing status. When the door of workshop 1 is open, workshop 1 is configured in a collaborative mode; when the door is closed, workshop 1 is configured in a set mode. Using the collaborative mode when the door is open allows for rapid compensation of airflow changes, preventing pressure differential runaway; when the door is closed, it returns to the set mode, optimizing energy consumption and control accuracy. A constant air volume valve 15 is also installed on the branch lines of the air supply duct 2 connecting to each workshop 1, providing basic airflow stability while ensuring minimum airflow for the cleanliness of workshop 1.

[0026] The automatic differential pressure adjustment system for workshops described in this invention operates on a closed-loop control mechanism: the differential pressure gauge 8 detects the differential pressure in workshop 1 in real time and sends a feedback signal to the controller; the controller compares the measured differential pressure with the set value and outputs an adjustment signal through calculation logic; the first electric regulating valve 5 and the second electric regulating valve 6 adjust the valve openings of the supply and return air branches respectively, changing the air volume distribution; the fan 4 provides a constant air source to ensure system power; the supply air duct 2 and the return air duct 3 work together to form a dynamic air pressure network. Ultimately, this achieves fully automatic differential pressure adjustment between workshops 1, significantly improving adjustment speed and accuracy; reducing manual operation costs; and improving the operating efficiency of workshop 1. In addition, each workshop 1 can independently select one of the following modes: variable return air mode, variable supply air mode, or collaborative mode. Variable return air mode and variable supply air mode are suitable for scenarios where the control precision requirements are not extremely high but system stability and energy efficiency are important. This is because these two modes simplify the control logic and reduce system complexity by fixing the valve opening of a single airflow channel, thereby achieving the advantages of stable operation, easier control, and lower energy consumption. Variable return air mode is suitable for stable supply air volume, and variable supply air mode is suitable for stable return air volume. Collaborative mode is suitable for high-precision control, but collaborative mode is more difficult to control and consumes more energy because it requires coordinating the dynamic adjustment of two valves, thereby improving the overall efficiency and reliability of the system. The three modes enable personalized control for each workshop, improve system flexibility and response speed, and optimize energy utilization efficiency.

[0027] The automatic differential pressure adjustment system for workshops described in this utility model also includes an integrated air control zone 9, combined with... Figure 2As shown, the air inlet of the supply air duct 2 and the air outlet of the return air duct 3 both extend into the integrated air control zone 9. The fan 4 is located within the integrated air control zone 9 and directly opposite the air inlet of the supply air duct 2, centrally managing the air source and improving system integration and maintenance convenience. A filter 10 is installed within the integrated air control zone 9, located between the air inlet of the supply air duct 2 and the air outlet of the return air duct 3. This filter purifies the supply airflow, removing dust and microorganisms to ensure air quality in workshop 1. A fresh air inlet 11 is installed within the integrated air control zone 9, located near the air outlet of the return air duct 3. This inlet introduces fresh external air, dynamically adjusting the fresh air volume to balance system pressure, helping to maintain pressure differential stability and replenishing oxygen consumption. A third electric regulating valve 12, connected to the controller signal, is installed at the fresh air inlet 11. This valve automatically adjusts the fresh air volume according to demand, adjusting the valve opening in real-time response to the pressure differential signal to ensure the fresh air intake matches system requirements, thereby optimizing pressure differential control accuracy. In a specific embodiment, the third electric regulating valve 12 is an electric double-leaf regulating valve. This type of valve uses an electric actuator to drive multiple blades to open and close synchronously, achieving continuous and precise adjustment of the airflow. The integrated air control zone 9 is equipped with a dehumidifier 13 and a thermostat 14. The dehumidifier 13 and thermostat 14 are located between the air inlet of the supply air duct 2 and the air outlet of the return air duct 3. The dehumidifier 13 and thermostat 14 are used to regulate the humidity and temperature of the airflow entering the supply air duct 2, ensuring that the air supplied to the workshop 1 meets environmental requirements. Combined with... Figure 3 As shown, the automatic differential pressure adjustment system for the workshop described in this utility model also includes an exhaust duct 16 connected to the return air duct 3. A fourth electric regulating valve 17 is installed on the exhaust duct 16. The exhaust duct 16 is used to discharge part of the return air from the system, and the fourth electric regulating valve 17 controls the exhaust volume to help maintain system airflow balance and differential pressure stability. A fifth electric regulating valve 18 is installed at the outlet of the return air duct 3. The fifth electric regulating valve 18 regulates the amount of return air to be reused, optimizing airflow distribution and energy recovery. The controller is connected to the third electric regulating valve 12, the fourth electric regulating valve 17, and the fifth electric regulating valve 18. In a specific embodiment, both the fourth electric regulating valve 17 and the fifth electric regulating valve 18 are electric proportional-integral valves. These electric proportional-integral valves can achieve continuous and precise adjustment, responding to controller signals and ensuring the stability and accuracy of airflow control.

[0028] In a specific embodiment, the controller is configured to select one of three modes: normal mode, ventilation mode, and energy-saving mode. Normal mode balances fresh air and return air, ventilation mode prioritizes fresh air, and energy-saving mode prioritizes return air to adapt to different environmental needs. In normal mode, the third electric regulating valve 12, the fourth electric regulating valve 17, and the fifth electric regulating valve 18 are configured to be at a set opening degree to deliver a mixed airflow of fresh air and return air into the workshop. Normal mode provides a stable mixed airflow, meeting basic air quality requirements while maintaining energy consumption at a reasonable level. In ventilation mode, the third electric regulating valve 12 and the fourth electric regulating valve 17 are configured to be open, and the fifth electric regulating valve 18 is configured to be closed to deliver 100% fresh air into the workshop. Ventilation mode ensures fresh indoor air and is suitable for scenarios requiring high air exchange rates, such as when indoor pollutant concentrations are high. In energy-saving mode, the fifth electric regulating valve 18 is configured to be open, the fourth electric regulating valve 17 is configured to be closed, and the third electric regulating valve 12 is configured to be closed or at its minimum opening. This allows for the delivery of full return air or a mixture of return air and a small amount of fresh air into the workshop. Energy-saving mode maximizes the utilization of return air and reduces energy consumption for fresh air handling. It is suitable for situations where indoor air quality is good and no additional fresh air supply is needed to save energy, or when the external air quality is poor and the introduction of fresh air is reduced to avoid polluting the indoor environment. Since the return air in workshop 1 is usually close to the set temperature and humidity conditions in workshop 1, the reuse of return air can recover some energy, reduce the need for fresh air handling, thereby reducing the overall energy consumption and operating costs of the system. At the same time, it helps to maintain the stability of temperature and humidity in workshop 1 and improves environmental control efficiency. Switching between the three modes allows the system to adjust its operating strategy according to external conditions and internal needs. Normal mode is suitable for daily operation, ventilation mode prioritizes air quality, and energy-saving mode optimizes energy consumption, improving system adaptability. The coordinated operation of these two sets of three modes enables the system to automatically optimize control strategies based on real-time operating conditions. For example, during normal production, a combination of normal mode and variable return air mode is used to maintain a stable pressure difference. When air quality deteriorates, the system switches to ventilation mode and coordinated mode for rapid air exchange. During energy cost-sensitive periods, energy-saving mode and variable supply air mode are used to reduce operating costs, thereby achieving comprehensive scenario adaptation.The key point of this embodiment is the introduction of a first electric regulating valve 5, a second electric regulating valve 6, a third electric regulating valve 12, a fourth electric regulating valve 17, and a fifth electric regulating valve 18. These valves allow for the adjustment of the supply and / or return air volume distribution when needed by adjusting the valve opening of the first electric regulating valve 5 and / or the second electric regulating valve 6; and for adjusting the opening or closing of the third electric regulating valve 12, the fourth electric regulating valve 17, and the fifth electric regulating valve 18 when needed, thereby changing the fresh air and return air ratio. As for other structures such as the differential pressure gauge 8, the controller, the first electric regulating valve 5, the second electric regulating valve 6, the opening / closing detection switch, the third electric regulating valve 12, the fourth electric regulating valve 17, and the fifth electric regulating valve 18, their control principles and structures are known to those skilled in the art and will not be specifically elaborated upon in this embodiment.

[0029] The automatic differential pressure adjustment system for workshops described in this utility model is equipped with an integrated air control zone 9. The third electric regulating valve 12 of the fresh air inlet 11 receives control signals and adjusts the fresh air volume. Based on differential pressure feedback, it dynamically adjusts the fresh air ratio to ensure system air pressure balance. The filter 10 filters and purifies the fresh air and return air. The fan 4 pressurizes the mixed air in the integrated air control zone 9 and sends it into the air supply duct 2. The entire area realizes air pretreatment and circulation control, improves the overall system efficiency, and can simultaneously handle supply and return airflow with a single fan 4. It realizes air circulation and pressurization in the integrated space, simplifies the structure, and improves energy utilization and control consistency.

[0030] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An automatic differential pressure adjustment system for a workshop, characterized in that: The system is applied to several workshops (1) with differential pressure requirements, including an air supply duct (2), a return air duct (3), a fan (4), a differential pressure gauge (8), a first electric regulating valve (5), a second electric regulating valve (6), and a controller. The fan (4) delivers air to each workshop (1) through the air supply duct (2). The return air duct (3) is used to discharge the gas in each workshop (1). The differential pressure gauge (8) extends into two workshops (1) with differential pressure requirements at both ends to detect the differential pressure between the two workshops (1). The first electric regulating valve (5) is set on the branch of the air supply duct (2) that connects to each workshop (1), and the second electric regulating valve (6) is set on the branch of the return air duct (3) that connects to each workshop (1). The controller is signal-connected to the differential pressure gauge (8), the first electric regulating valve (5), and the second electric regulating valve (6).

2. The workshop differential pressure automatic adjustment system according to claim 1, characterized in that: The controller is configured to allow each workshop (1) to independently select one of the following modes: variable return air mode, variable supply air mode, or collaborative mode; When the workshop (1) is in the variable return air mode, the first electric regulating valve (5) is configured to be in the fixed opening state, and the second electric regulating valve (6) is configured to be in the variable opening state. When the workshop (1) is in the variable air supply mode, the first electric regulating valve (5) is configured to be in the variable opening state, and the second electric regulating valve (6) is configured to be in the fixed opening state. When the workshop (1) is in collaborative mode, both the first electric regulating valve (5) and the second electric regulating valve (6) are configured to be in variable opening state.

3. The workshop differential pressure automatic adjustment system according to claim 2, characterized in that: Each workshop (1) door is equipped with an opening / closing detection switch connected to the controller signal; When the door of workshop (1) is open, workshop (1) is configured to be in collaborative mode; when the door of workshop (1) is closed, workshop (1) is configured to be in the set mode.

4. The workshop differential pressure automatic adjustment system according to claim 1, characterized in that: It also includes an integrated air control zone (9), where the air inlet of the air supply duct (2) and the air outlet of the return air duct (3) extend into the integrated air control zone (9), and the fan (4) is located in the integrated air control zone (9) and faces the air inlet of the air supply duct (2); The integrated air control area (9) is equipped with a dehumidifier (13) and a thermostat (14), which are located between the air inlet of the air supply duct (2) and the air outlet of the return air duct (3).

5. The workshop differential pressure automatic adjustment system according to claim 4, characterized in that: The integrated air control area (9) is provided with a fresh air inlet (11), which is located at one end of the air outlet near the return air duct (3); a third electric regulating valve (12) is provided at the fresh air inlet (11). It also includes an exhaust duct (16) connected to the return air duct (3), and a fourth electric regulating valve (17) is provided on the exhaust duct (16); a fifth electric regulating valve (18) is provided at the air outlet of the return air duct (3). The controller is connected to the third electric regulating valve (12), the fourth electric regulating valve (17), and the fifth electric regulating valve (18).

6. The workshop differential pressure automatic adjustment system according to claim 5, characterized in that: The controller is configured to select one of the following modes: normal mode, ventilation mode, and energy-saving mode. When in normal mode, the third electric regulating valve (12), the fourth electric regulating valve (17), and the fifth electric regulating valve (18) are configured to be in a set opening state to deliver a mixture of fresh air and return air into the workshop. When in ventilation mode, the third electric regulating valve (12) and the fourth electric regulating valve (17) are configured to be in the open state, and the fifth electric regulating valve (18) is configured to be in the closed state, so as to deliver fresh air into the workshop; When in energy-saving mode, the fifth electric regulating valve (18) is configured to be open, the fourth electric regulating valve (17) is configured to be closed, and the third electric regulating valve (12) is configured to be closed or at minimum opening to deliver full return air or mixed air with a small amount of fresh air into the workshop.

7. The workshop differential pressure automatic adjustment system according to claim 4, characterized in that: The integrated air control area (9) is equipped with a filter (10), which is located between the air inlet of the air supply duct (2) and the air outlet of the return air duct (3).

8. The workshop differential pressure automatic adjustment system according to claim 1, characterized in that: A constant air volume valve (15) is also installed on the branch line of the air supply duct (2) that connects to each workshop (1).

9. The workshop differential pressure automatic adjustment system according to claim 1, characterized in that: The first electric regulating valve (5) and the second electric regulating valve (6) are both electric proportional integral air valves; the controller is a PLC controller (7).

10. The workshop differential pressure automatic adjustment system according to claim 5, characterized in that: The third electric regulating valve (12) is an electric split-leaf regulating valve; the fourth electric regulating valve (17) and the fifth electric regulating valve (18) are both electric proportional integral air valves.

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