Device for accurately controlling fresh air volume of air conditioning system

Abstract

The invention belongs to the technical field of cigarette factory air conditioner control, and particularly relates to a device for accurately controlling the fresh air volume of an air conditioning system. The air valve operation state pointer sight glass device is arranged at the air valve, an angle displacement sensor is arranged on a main transmission shaft of the air valve, and the angle displacement sensor is in electric signal connection with the upper computer. Instrument values can be directly observed through the photoscope outside the flexible connection heat preservation device of the air conditioner fresh air valve, the air volume of the fresh air valve can be observed in real time through the photoscope during working, and equipment maintenance is facilitated. The fresh air volume of the air conditioner is accurately controlled, and energy waste caused by excessive load of a refrigerating machine in summer is avoided; steam waste caused by excessive entering of external cold air in winter is avoided, and the purposes of reducing cost and improving efficiency are practically achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air-conditioning control in tobacco factories, and in particular relates to a device for accurately controlling the fresh air volume of an air-conditioning system. Background Art

[0002] Combined air conditioning units are key air treatment equipment in cigarette factories. They primarily consist of a fresh air section, a mixed air section, a filtration section, a surface cooling section, a heating section, and a humidification section (including steam humidification and high-pressure mist humidification). Air is delivered from the supply plenum to the user workshops by a supply fan, and then to the mixing plenum via a return fan, completing the circulation cycle. Because cigarette factory air conditioning units are process-based, they maintain extremely high temperature and humidity requirements in energy-consuming workshops (such as the silk-making workshop, the rolling and packaging workshop, the silk storage room, and the silk-matching room) to ensure cigarette production quality. The air conditioner cools or heats the air to the desired temperature through the surface cooling or heating section. The humidification section then humidifies the air to the system's required humidity, achieving the designated air supply point. Finally, the treated air is delivered to the user workshops through the fan section, meeting the process requirements of cigarette production.

[0003] The fresh air system of the air conditioning unit consists of a fresh air valve, an electric actuator for the fresh air valve, a canvas flexible joint, fresh air ducting, connecting flanges for the flexible joint, and mounting bolts. The air conditioning unit operates with a minimum fresh air volume of 10%. This ensures air quality in the production workshop while also compensating for exhaust air and maintaining positive indoor pressure. Furthermore, the PLC automatically adjusts the fresh air valve's air volume to achieve mixed regulation with return air in different environments and conditions, particularly during seasonal changes. This reduces steam usage and the frequency of refrigeration equipment startup, ultimately achieving energy savings and cost reductions.

[0004] Specific manifestations of fresh air valve failure during operation:

[0005] ① The fresh air valve transmission mechanism malfunctions and becomes stuck, making it impossible for the electric actuator to control the fresh air valve. If the fresh air valve is in a fully closed state, the air quality in the workshop cannot be guaranteed, and the workshop is under a slight negative pressure, which does not meet the production process requirements. ② If the valve is stuck in other fault conditions, the fresh air valve opening degree cannot be automatically controlled, resulting in a huge waste of energy. For example, during the seasonal change, when the ambient temperature is low and the workshop temperature is high, simply increasing the fresh air volume to cool the workshop can meet the production temperature requirements. However, due to the fresh air valve being stuck and unable to be controlled, the refrigerator needs to be turned on to cool the air through the surface cooler, resulting in energy waste. ③ In winter, due to the extremely low ambient temperature and humidity, the fresh air valve malfunctions and becomes stuck and uncontrollable. Once the fresh air volume is excessive and the workshop temperature and humidity are low, the steam heater and steam humidifier will be over-activated to compensate for the temperature increase and humidification to meet the production process requirements, resulting in energy waste. ④ During long-term operation, if the opening degree of the fresh air valve is inconsistent with the opening degree of the electric actuator, the PLC will not be able to accurately control the fresh air volume, which will also cause energy waste. In the summer, the external ambient temperature is high. Once the fresh air volume is too large, the refrigeration load will increase to cool the air to meet the production process requirements, resulting in energy waste. In the winter, due to the extremely low external temperature and humidity, if the fresh air volume is too large and the temperature and humidity in the workshop are low, the steam heater and steam humidifier will be opened too high to compensate for the temperature and humidification to meet the production process requirements, resulting in energy waste. Summary of the Invention

[0006] The object of the present invention is to provide a device for accurately controlling the fresh air volume of an air-conditioning system, so as to solve the problems existing in the above-mentioned background technology.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] A device for accurately controlling the fresh air volume of an air conditioning system, comprising basic insulation of the fresh air system and secondary enhanced insulation of the air valve;

[0009] An air valve operating status pointer sight glass device is arranged at the air valve, and an angle displacement sensor is arranged on the main transmission shaft of the air valve, and the angle displacement sensor is connected to the upper machine electrical signal.

[0010] Furthermore, the basic insulation is to fill the groove of the metal frame of the air valve flange with rubber-plastic plates, and the secondary reinforced insulation is to cut the rubber-plastic plates according to the actual size of the air valve and perform secondary reinforced insulation on the air valve.

[0011] Furthermore, the thickness of the rubber-plastic plate is 20 mm.

[0012] Furthermore, the air valve operation status pointer sight glass device includes a sight glass cylindrical barrel, a magnifying glass and a sight glass inspection cover; the sight glass cylindrical barrel includes a barrel body and a flange seat arranged at the lower end of the barrel body, the flange seat is connected to the end face of the air valve operation pointer and is embedded in the rubber-plastic plate, an external thread is provided on the outer side of the upper end of the barrel body, which is threadedly connected to the sight glass inspection cover, and the perspective mirror is arranged on the inner side of the sight glass inspection cover.

[0013] Furthermore, the cylindrical barrel of the sight glass protrudes 15 mm from the rubber-plastic plate.

[0014] Furthermore, sealing rings are respectively provided between the perspective mirror and the sight glass inspection cover and the cylinder body.

[0015] Furthermore, the angular displacement sensor is installed on the main transmission shaft of the air valve, and the measuring range is 0°-340°.

[0016] The beneficial effects of the present invention are:

[0017] The instrument readings can be directly observed through a perspective mirror attached to the insulation device of the air conditioner's fresh air valve. During operation, the fresh air valve air volume can be observed in real time through the sight glass, facilitating equipment maintenance. This allows for precise control of the air conditioner's fresh air volume, avoiding energy waste caused by excessive chiller load in the summer and steam waste caused by excessive cold air in the winter, effectively reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the pointer sight glass device for the operating status of the air valve of the present invention.

[0019] Figure 2 Schematic diagram of the air valve and insulation device.

[0020] Figure 3 This is a working diagram of the angle displacement sensor.

[0021] Description of reference numerals:

[0022] 1. Sight glass inspection cover; 2. Sight glass cylindrical barrel; 3. Flange base; 4. Fixing hole; 5. Sealing ring; 6. Insulation rubber-plastic plate; 7. Air valve; 8. Flexible connection insulation device; 9. Pointer sight glass device; 10. Gear; 11. Air valve drive shaft; 12. Electric actuator; 13. Instrument; 14. Transmission circuit; 15. PLC controller; 16. Periscope. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, and cannot be interpreted as limiting the technical solution of the present invention.

[0024] like Figures 1 to 3 As shown, this application provides a device for precisely controlling the fresh air volume of an air conditioning system, utilizing 20mm-thick rubber-plastic panels to insulate the fresh air system. First, the grooves in the metal frame of the damper flange are filled with rubber-plastic panels that exhibit high elasticity, toughness, corrosion resistance, wear resistance, antistatic properties, fire retardancy, high compression strength, and high fatigue resistance. This is done to prevent overhangs and air ingress, providing initial insulation. The rubber-plastic panels are then cut to the actual size of the damper, providing a secondary, enhanced insulation treatment for the damper system.

[0025] A sight glass device for the damper operating status indicator was fabricated. The sight glass was sealed with sealant and connected to the operating indicator face via a flange. It was then tightly fitted into the insulating rubber-plastic panel. The cylindrical body of the sight glass protruded approximately 15mm from the insulating rubber-plastic panel and had external threads. The sight glass inspection cover was internally threaded and contained a sealing gasket. The cover and the cylindrical body were threaded together. This sight glass device features excellent transparency, good sealing, 10x magnification, and easy maintenance.

[0026] The angular displacement sensor control program was introduced into the kinetic energy center's host computer for monitoring. The angular displacement sensor, installed on the damper's main drive shaft, has a measuring range of 0°-340° and a damper opening range of 0°-90°, sufficient to meet the damper's operational requirements. The angular displacement sensor, installed on the kinetic energy center's host computer, provides online detection, representing the damper's actual opening during operation. If the unit's fresh air valve electric actuator's required opening differs from the angular displacement sensor's reading, an alarm is generated, indicating a fault in the connection between the fresh air valve electric actuator and the fresh air valve (including a stuck fresh air valve drive mechanism, a loose connection between the electric actuator and the damper main shaft, or damage to the electric actuator). Once the host computer generates an alarm, the on-duty operator promptly notifies maintenance personnel for expedited repairs, minimizing energy waste and ensuring the air conditioning unit meets the process requirements for cigarette production.

[0027] Working principle:

[0028] The metal frame groove of the damper flange of the air conditioner's fresh air valve's flexible joint insulation device is filled with 20mm rubber-plastic sheeting to create a sight glass device 9 indicating the damper's operating status. This sight glass is sealed and embedded within the insulation rubber-plastic sheeting 6. The sight glass's cylindrical barrel 2 protrudes approximately 15mm from the insulation rubber-plastic sheeting and has external threads. The sight glass inspection cover 1 is internally threaded and contains a sealing ring 5. The sight glass inspection cover 1 and the sight glass's cylindrical barrel 2 are threadedly connected. The sight glass is secured to the outside of the flexible joint insulation device 8 of the air conditioner's damper 7 via fixing holes 4 in the flange base 3. This sight glass device features excellent transparency and sealing properties.

[0029] PLC controller 15 is connected to electric actuator 12 via transmission circuit 14. Electric actuator 12 receives commands from PLC controller 15 and drives gear 10 of the angle displacement sensor to engage and rotate via damper drive shaft 11. Gear 10 drives meter 13 via damper drive shaft 11 to adjust the pointer scale. This ensures that the actual scale of the fresh air valve indicated by meter 13 matches the scale of the command indicator on the air conditioning terminal. A perspective mirror 16, attached to the flexible connection of the air conditioning fresh air valve and outside the insulation device, allows direct observation of the meter value. During operation, the fresh air valve air volume can be observed in real time through the sight glass, facilitating equipment maintenance. This achieves precise control of the fresh air volume of the air conditioning system, avoiding energy waste caused by excessive chiller load in summer and steam waste caused by excessive inflow of cold air in winter, effectively achieving the goal of reducing costs and increasing efficiency.

[0030] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for accurately controlling the fresh air volume of an air conditioning system, characterized in that: Including basic insulation of the fresh air system and secondary enhanced insulation of the air valve; An air valve operating status pointer sight glass device is arranged at the air valve, and an angle displacement sensor is arranged on the main transmission shaft of the air valve, and the angle displacement sensor is connected to the upper machine electrical signal.

2. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 1, characterized in that: The basic insulation is to fill the groove of the metal frame of the air valve flange with rubber-plastic plates, and the secondary reinforced insulation is to cut the rubber-plastic plates according to the actual size of the air valve and perform secondary reinforced insulation on the air valve.

3. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 2, characterized in that: The thickness of the rubber-plastic board is 20mm.

4. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 1, characterized in that: The air valve operation status pointer sight glass device includes a sight glass cylindrical cylinder, a magnifying glass and a sight glass inspection cover; the sight glass cylindrical cylinder includes a cylinder body and a flange seat arranged at the lower end of the cylinder body, the flange seat is connected to the end face of the air valve operation pointer and is embedded in the rubber-plastic plate, an external thread is provided on the outer side of the upper end of the cylinder body, which is threadedly connected to the sight glass inspection cover, and the perspective mirror is arranged on the inner side of the sight glass inspection cover.

5. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 4, characterized in that: The cylindrical body of the sight glass protrudes 15mm from the rubber-plastic plate.

6. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 4, characterized in that: Sealing rings are respectively provided between the perspective mirror and the sight glass inspection cover and the cylinder body.

7. The device for accurately controlling the fresh air volume of an air conditioning system according to claim 1, characterized in that: The angle displacement sensor is installed on the main transmission shaft of the air valve, and the measuring range is 0°-340°.

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