A constant temperature control system for single PID control of multiple devices of an air conditioning system

Abstract

This utility model provides a single PID control system for multiple devices in an air conditioning system, including a conveying duct with an internal conveying air channel and an internal air outlet channel. The top inner wall of the air outlet channel has a ventilation opening, and the bottom inner wall has an air outlet. A PID control assembly is fixedly connected to the top inner wall of the conveying air channel, and a chilled water temperature control valve is fixedly connected to the inner wall of the conveying air channel. The chilled water temperature control valve and the fan inverter share a single PID control assembly. When the fan starts, the PID calculation is performed using the returned air temperature sensor's sensing value and the PID's set value. The PID output (0-50) controls the opening degree of the chilled water temperature control valve, and the PID output (50-100) controls the frequency of the fan inverter. Since the opening range of the chilled water temperature control valve is 0-100%, when the PID output is 0-50, this value needs to be multiplied by two before being sent to the chilled water temperature control valve. A minimum operating frequency is required when the fan inverter starts.

Description

Technical Field

[0001] This utility model is a single PID control system for multiple devices in an air conditioning system, belonging to the field of air conditioning systems. Background Technology

[0002] As is well known, an air conditioning system is a system used to manage indoor air temperature, humidity, cleanliness, and airflow speed, aiming to improve occupational health and indoor climate conditions. Air conditioning systems can regulate indoor air and provide a comfortable environment through components such as refrigeration, ventilation, and electrical control systems. A constant temperature and humidity air conditioning system refers to a specialized air conditioning system with strict requirements for temperature, humidity, and cleanliness. To maintain a constant airflow, the temperature of the supplied air can be adjusted by changing the opening of the chilled water valve to alter the chilled water flow rate. Alternatively, with a constant chilled water flow rate, the frequency of the fan inverter can be adjusted to change the airflow volume, thus also regulating the supplied air temperature.

[0003] However, existing technology uses a single PID controller to control the chilled water temperature control valve of the air conditioning unit. The air conditioning unit's fan inverter does not participate in automatic frequency adjustment control. This control method limits the flexibility and adjustability of the air conditioning unit's fan inverter. In environments with excessively high temperatures, even if the temperature control valve is fully open, the ambient temperature cannot be quickly reduced to the set temperature. It is still necessary to manually increase the fan frequency, or run the inverter at a high frequency when the fan starts, only adjusting the water valve. In some cases where high-frequency operation is not required, electrical energy is wasted. This results in a very low utilization rate of the air conditioning unit's fan inverter, increasing the time required for manual inspection and monitoring. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a single PID control system for multiple devices in an air conditioning system, thereby solving the problems mentioned in the background. This invention meets the needs of the field, fully utilizes the flexibility and adjustability of the frequency converter, is more convenient for field use, and can also save some electrical energy.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a constant temperature control system for multiple devices under single PID control in an air conditioning system, comprising a conveying duct, an air delivery channel inside the conveying duct, an air outlet channel inside the conveying duct, a ventilation opening on the inner top wall of the air outlet channel, an air outlet on the inner bottom wall of the air outlet channel, a PID control assembly fixedly connected to the inner top wall of the conveying duct, an ice water temperature control valve fixedly connected to the inner wall of the conveying duct, a filter element fixedly connected to the inner wall of the conveying duct, a fan frequency converter fixedly connected to the inner wall of the conveying duct, a return air duct fixedly sleeved on the inner bottom wall of the air outlet channel, an air outlet regulating component provided on the inner wall of the air outlet, and a control component fixedly connected to the inner top wall of the air outlet channel.

[0006] Furthermore, a fresh air duct is fixedly connected to one side of the conveying air duct, and one end of the fresh air duct is connected to the conveying air trough.

[0007] Furthermore, the air outlet adjustment component includes a connecting rod fixedly connected to the inner wall of the air outlet, a bearing fixedly sleeved on the outer wall of the connecting rod, a wind plate fixedly connected to the outer ring of the bearing, and a magnetic plate fixedly connected to one side of the wind plate.

[0008] Furthermore, the control component includes a fixed plate fixedly connected to the inner top wall of the air outlet duct, an electric telescopic rod fixedly connected to one side of the fixed plate, and a movable plate fixedly connected to one end of the electric telescopic rod.

[0009] Furthermore, a roller frame is fixedly connected to the inner top wall of the air outlet duct, and a soft magnetic strip is fixedly connected to the outer wall of the roller frame.

[0010] Furthermore, one end of the soft magnetic strip is movably wound around the outside of the roll frame, and one end of the soft magnetic strip is fixedly connected to one side of the moving plate.

[0011] The beneficial effects of this utility model are:

[0012] 1. The chilled water thermostatic valve and the fan inverter share a single PID control assembly. When the fan starts, the PID calculation is performed using the return air temperature sensor's sensing value and the PID setpoint. The PID output (0-50) controls the opening of the chilled water thermostatic valve, and the PID output (50-100) controls the frequency of the fan inverter. Since the opening range of the chilled water thermostatic valve is 0-100%, when the PID output is 0-50, this value needs to be multiplied by two before being sent to the chilled water thermostatic valve. When the fan inverter starts, a minimum operating frequency is required. Under some low-demand control conditions, the inverter operates at the minimum operating frequency, automatically adjusting the indoor temperature based on the opening of the chilled water thermostatic valve. Once the value required by the PID calculation exceeds 50, the thermostatic valve is fully open, and the fan inverter can automatically engage automatic frequency adjustment to meet the needs of the site. This fully utilizes the inverter's flexibility and adjustability, making it more convenient for on-site use and saving some energy.

[0013] 2. The electric telescopic rod can move the movable plate, which will unfold the soft magnetic strip. The soft magnetic strip will attract the magnetic plate on one side of the air plate, and the magnetic plate will drive the air plate to rotate vertically. This will create a gap between the air plate and the other air plates on both sides, allowing cold or warm air to flow out through the gap, thus opening the air vent. Since there are multiple air plates, the longer the soft magnetic strip is unfolded, the larger the air vent opens. Because there are multiple air outlet adjustment and control components, the position and size of the air outlet can be adjusted according to needs, thus further meeting the usage requirements of the device. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the structure of a single PID control multi-device constant temperature control system for an air conditioning system according to this utility model;

[0016] Figure 2 This is the structural schematic of the electric telescopic rod in this utility model;

[0017] Figure 3 for Figure 1 Enlarged view of the structure at point A in the middle;

[0018] Figure 4 This is a schematic diagram of the structure of the stroke plate of this utility model.

[0019] In the diagram: 1. Air delivery duct; 2. Fresh air duct; 3. PID control assembly; 4. Chilled water temperature control valve; 5. Filter element; 6. Fan frequency converter; 7. Air delivery duct; 8. Ventilation outlet; 9. Air outlet duct; 10. Air outlet; 11. Connecting rod; 12. Bearing; 13. Air vane; 14. Magnetic plate; 15. Electric telescopic rod; 16. Moving plate; 17. Roller frame; 18. Soft magnetic strip; 19. Fixed plate; 20. Return air duct. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] Please see Figures 1-4 This utility model provides a technical solution: a constant temperature control system for a multi-device air conditioning system with single PID control, including a conveying air duct 1, a conveying air channel 7 inside the conveying air duct 1, an air outlet channel 9 inside the conveying air duct 1, a ventilation opening 8 on the inner top wall of the air outlet channel 9, an air outlet 10 on the inner bottom wall of the air outlet channel 9, a PID control assembly 3 fixedly connected to the inner top wall of the conveying air channel 7, an ice water temperature control valve 4 fixedly connected to the inner wall of the conveying air channel 7, a filter element 5 fixedly connected to the inner wall of the conveying air channel 7, a fan frequency converter 6 fixedly connected to the inner wall of the conveying air channel 7, a return air duct 20 fixedly sleeved on the inner bottom wall of the air outlet channel 9, an air outlet regulating component on the inner wall of the air outlet 10, and a control component fixedly connected to the inner top wall of the air outlet channel 9.

[0022] A fresh air duct 2 is fixedly connected to one side of the conveying air duct 1, and one end of the fresh air duct 2 is connected to the conveying air trough 7. The airflow will enter the interior of the conveying air duct 1 through the fresh air duct 2.

[0023] The air outlet adjustment component includes a connecting rod 11 fixedly connected to the inner wall of the air outlet 10. A bearing 12 is fixedly sleeved on the outer wall of the connecting rod 11. A wind plate 13 is fixedly connected to the outer ring of the bearing 12. A magnetic plate 14 is fixedly connected to one side of the wind plate 13. The connecting rod 11 can support the wind plate 13. There are multiple air outlet adjustment components, which are evenly arranged horizontally inside the air outlet 10. When the wind plate 13 rotates, a gap will be left between the wind plate 13 and the other wind plates 13 on both sides, so that cold or warm air can flow out through the gap, thereby opening the air outlet.

[0024] The control components include a fixed plate 19 fixedly connected to the inner top wall of the air outlet duct 9. An electric telescopic rod 15 is fixedly connected to one side of the fixed plate 19. A movable plate 16 is fixedly connected to one end of the electric telescopic rod 15. The electric telescopic rod 15 is an existing device. When the electric telescopic rod 15 is activated, one end of it will retract, thereby driving the movable plate 16 to move.

[0025] A roller frame 17 is fixedly connected to the inner top wall of the air outlet duct 9, and a soft magnetic strip 18 is fixedly connected to the outer wall of the roller frame 17. A roller rod is rotatably connected to the inner wall of the roller frame 17, and the roller frame 17 can support the soft magnetic strip 18.

[0026] One end of the soft magnetic strip 18 is movably wound around the outside of the roll frame 17, and one end of the soft magnetic strip 18 is fixedly connected to one side of the moving plate 16. The number of control components is still multiple. The soft magnetic strip 18 is relatively long and can be stored outside the roll rod wound on one side of the roll frame 17. When the electric telescopic rod 15 drives the moving plate 16 to move, it will unfold the soft magnetic strip 18.

[0027] Working principle: First, the chilled water temperature control valve 4 and the fan inverter 6 share a set of PID control assembly 3. When the fan starts running, the PID calculation is performed by the sensed value of the return air temperature sensor and the set value of the PID. The PID output 0-50 controls the opening degree of the chilled water temperature control valve 4, and the PID output 50-100 controls the frequency of the fan inverter 6. Since the opening range of the chilled water temperature control valve 4 is 0-100%, when the PID output is 0-50, this value needs to be multiplied by two before being sent to the chilled water temperature control valve 4. When the fan inverter 6 starts, a minimum operating frequency needs to be provided. Under some low demand control conditions, the inverter operates at the minimum operating frequency, and the indoor temperature is automatically adjusted by relying on the opening degree of the chilled water temperature control valve 4. Once the value required by the PID calculation is greater than 50, the opening degree of the temperature control valve is also fully open, and the fan inverter 6 can automatically engage in automatic frequency adjustment to meet the needs of the site.

[0028] Secondly, when the electric telescopic rod 15 is activated, one end will retract, which will drive the moving plate 16 to move. When the moving plate 16 moves, it will spread out the soft magnetic strip 18. The soft magnetic strip 18 will attract the magnetic plate 14 on one side of the air plate 13. The magnetic plate 14 will drive the air plate 13 to rotate in a vertical position, which will leave a gap between the air plate 13 and the other air plates 13 on both sides. Cold or warm air can flow out through the gap, thereby opening the air vent.

[0029] Finally, since there are multiple air vanes 13, the longer the soft magnetic strip 18 is spread out, the larger the air vent opens. Since there are multiple air outlet adjustment components and control components, the position and size of the air outlet can be adjusted according to needs.

[0030] 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. 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 constant temperature control system for a multi-device air conditioning system using a single PID controller, comprising a conveying air duct (1), characterized in that: The conveying air duct (1) has a conveying air trough (7) inside, the conveying air duct (1) has an air outlet trough (9) inside, the air outlet trough (9) has a ventilation opening (8) on its inner top wall, the air outlet trough (9) has an air outlet (10) on its inner bottom wall, the conveying air trough (7) has a PID control assembly (3) fixedly connected to its inner top wall, the conveying air trough (7) has an ice water temperature control valve (4) fixedly connected to its inner wall, the conveying air trough (7) has a filter element (5) fixedly connected to its inner wall, the conveying air trough (7) has a fan frequency converter (6) fixedly connected to its inner wall, the air outlet trough (9) has a return air duct (20) fixedly sleeved on its inner bottom wall, the air outlet (10) has an air outlet adjustment component on its inner wall, and the air outlet trough (9) has a control component fixedly connected to its inner top wall.

2. The constant temperature control system for a multi-device air conditioning system with single PID control according to claim 1, characterized in that: A fresh air duct (2) is fixedly connected to one side of the conveying air duct (1), and one end of the fresh air duct (2) is connected to the conveying air trough (7).

3. The constant temperature control system for a multi-device air conditioning system according to claim 1, characterized in that: The air outlet adjustment component includes a connecting rod (11) fixedly connected to the inner wall of the air outlet (10). A bearing (12) is fixedly sleeved on the outer wall of the connecting rod (11). A wind plate (13) is fixedly connected to the outer ring of the bearing (12). A magnetic plate (14) is fixedly connected to one side of the wind plate (13).

4. The constant temperature control system for a multi-device air conditioning system with single PID control according to claim 1, characterized in that: The control unit includes a fixed plate (19) fixedly connected to the inner top wall of the air outlet duct (9), an electric telescopic rod (15) fixedly connected to one side of the fixed plate (19), and a movable plate (16) fixedly connected to one end of the electric telescopic rod (15).

5. A constant temperature control system for a multi-device air conditioning system with single PID control according to claim 4, characterized in that: The inner top wall of the air outlet duct (9) is fixedly connected to a roller frame (17), and the outer wall of the roller frame (17) is fixedly connected to a soft magnetic strip (18).

6. A constant temperature control system for a multi-device air conditioning system with single PID control according to claim 5, characterized in that: One end of the soft magnetic strip (18) is movably wound around the outside of the roll frame (17), and one end of the soft magnetic strip (18) is fixedly connected to one side of the movable plate (16).

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