Air conditioning system for printing workshop

Abstract

The utility model relates to the technical field of workshop air conditioning systems, in particular to an air conditioning system for a printing workshop, which comprises an air conditioning unit and a controller, the air conditioning unit sequentially comprises a fresh air section, a primary filter section, a primary air return section, a surface cooling disc section, a secondary air return section, a fan section, a flow equalizing section, a medium-efficiency filter section and a humidifying air outlet section; the fresh air section is connected with a fresh air pipe, the fresh air pipe is provided with a first electric valve electrically connected with the controller, the humidification air outlet section communicates with the printing workshop through an air supply pipe, and a first pressure sensor electrically connected with the controller is arranged in the air supply pipe. A second pressure sensor electrically connected with the controller is arranged in the printing workshop, and the controller is used for controlling the air supply amount of the fan section to keep constant according to signals of the first pressure sensor and controlling the opening degree of the first electric valve on the fresh air pipe to keep constant pressure according to signals of the second pressure sensor. The combined type air conditioning unit can solve the technical problem that an existing combined type air conditioning unit is large in energy loss.

Description

Technical Field

[0001] The utility model relates to the technical field of workshop air-conditioning systems, in particular to an air-conditioning system for a printing workshop. Background Art

[0002] Printing workshop production has strict requirements on the air environment. For example, the ideal temperature of the workshop should be controlled at 20-25℃, and the humidity should be controlled between 50-65%. Such an environment helps to maintain the stability of paper and the printability of ink, and avoids problems such as paper deformation, ink diffusion or too fast drying caused by temperature and humidity fluctuations, thereby ensuring the consistency of printing quality and color. In addition, the ink widely used in the printing industry is generally composed of pigments, binders, solvents, fillers and auxiliary agents. The solvents used are mainly organic solvents such as aromatic hydrocarbons, esters, ketones, ethers, etc. Most of these solvents are toxic and volatile, with strong pungent odors, which will pollute the environment and affect the health of workers. Therefore, a good air conditioning system is also extremely important for ensuring the air quality in the workshop. At present, the common combined air-conditioning unit is composed of a mixing section, a filtering section, a surface cooling and dehumidification section, a heating section, a fan section, a humidification and flow equalization section, a medium-efficiency filtering section, and an air outlet section. The mixing section is used to mix the fresh air and the return air. However, during the entire processing process, the return air and the fresh air are subjected to surface cooling and dehumidification and heating together, which increases the energy loss of the system, as well as the workload of the dehumidification section and the heating section, and the energy saving performance of the air-conditioning unit is poor. Utility Model Content

[0003] The utility model provides an air conditioning system for a printing workshop, which can solve the technical problem of large energy loss of the existing combined air conditioning unit.

[0004] This application provides the following technical solutions:

[0005] An air conditioning system for a printing workshop comprises an air conditioning unit and a controller, wherein the air conditioning unit comprises a fresh air section, a primary filter section, a primary return air section, a surface cooling plate section, a secondary return air section, a fan section, a flow equalizing section, a medium-efficiency filter section, and a humidifying air outlet section in sequence; the fresh air section is connected with a fresh air duct, and a first electric valve electrically connected to the controller is arranged on the fresh air duct; the humidifying air outlet section is connected with the printing workshop through an air supply duct, and a first pressure sensor electrically connected to the controller is arranged in the air supply duct; return air ducts are arranged on both the primary return air section and the secondary return air section, and the two return air ducts are connected to the printing workshop through a return air main duct; a second pressure sensor electrically connected to the controller is arranged in the printing workshop, and the controller is used to control the air supply volume of the fan section to keep the air volume constant according to a signal of the first pressure sensor, and is used to control the opening of the first electric valve on the fresh air duct to keep the pressure constant according to a signal of the second pressure sensor.

[0006] Technical principle and beneficial effects: By setting the primary return air before the surface cooling plate section and the secondary return air after the surface cooling plate section, compared with the existing method of mixing the return air and the fresh air in the mixing section or before the surface cooling|heating, the present application has more stable control over the temperature and humidity, and has more significant energy-saving effects:

[0007] 1. The primary return air is mixed with the fresh air before the surface cooling coil. Since the return air has been circulated inside the workshop at this time, its temperature is usually higher than the indoor temperature. The fresh air is air introduced from the outside. For example, in summer, the fresh air temperature is much higher than the return air temperature. Mixing the primary return air with the fresh air in advance can help pre-cool the fresh air, making the temperature of the fresh air entering the surface cooling coil lower, thereby reducing the energy required for the surface cooling coil to cool the fresh air and improving the cooling efficiency.

[0008] 2. The environment of the printing workshop has stricter control over temperature and humidity. The primary return air is mixed with the fresh air and passed through the cooling coil, which can effectively remove excess humidity in the mixed air and avoid energy waste caused by excessive dehumidification. The secondary return air is added after the cooling coil. At this time, the air has been adjusted to a temperature close to the set condition. The re-mixing of the secondary return air helps to stabilize the air supply state and reduce energy consumption caused by relying solely on the cooling coil for adjustment. Because the secondary return air is extracted from the room, its temperature and humidity are closer to the target state. Re-mixing can more finely adjust the air supply to the set point, reduce the frequent adjustment of the cooling coil, and thus save energy.

[0009] 3. Dividing the return air into primary and secondary, the return air ratio can be flexibly adjusted according to the actual working conditions of the printing workshop, especially when the seasons change or the load fluctuates. This flexibility can better match the actual needs and reduce unnecessary energy consumption. For example, in winter or when the load is low, the primary return air ratio can be appropriately reduced and the secondary return air can be increased. The suitable temperature and humidity conditions inside the workshop can be used to reduce the heating or cooling requirements of the external fresh air.

[0010] 4. The pressure in the air supply duct is monitored by the first pressure sensor, and the controller adjusts the air supply of the fan section accordingly to keep the air volume constant; this method can ensure that the air conditioning system meets the required air volume of the workshop while avoiding energy waste caused by excessive air volume, and also reduces the additional energy consumption caused by insufficient air volume, such as additional cycles.

[0011] 5. The second pressure sensor is located in the printing workshop. It monitors the pressure changes in the workshop and feeds back to the controller. The controller adjusts the opening of the first electric valve on the fresh air duct accordingly. This ensures that the fresh air supply matches the actual needs of the workshop and avoids energy consumption caused by excessive introduction of fresh air. At the same time, it can also ensure the positive pressure or slightly positive pressure state inside the workshop, reduce the intrusion of external pollutants, and thus achieve energy saving while ensuring indoor air quality.

[0012] Furthermore, a primary filter plate filter is provided in the primary filter section, and a medium filter bag filter is provided in the medium filter section. Both the primary filter section and the medium filter section are provided with a differential pressure sensor for detecting the pressure at both ends of the filter, and the differential pressure sensor is electrically connected to an alarm.

[0013] Beneficial effects: As the filter is used for a longer time, dust and other impurities will accumulate on the filter medium, which will cause the pressure difference on both sides of the filter to gradually increase. The differential pressure sensor can continuously monitor this pressure change, thereby reflecting the degree of filter blockage; when the filter is blocked to a certain extent, that is, the pressure difference reaches the preset threshold, the differential pressure sensor will trigger an alarm to notify maintenance personnel that the filter needs to be cleaned or replaced. This ensures that the air volume of the air conditioning system will not be reduced due to filter blockage, maintaining the normal operating efficiency and air quality of the system.

[0014] In addition, regular maintenance according to the prompts of the differential pressure sensor can avoid fan overload caused by excessive filter blockage, thereby protecting key components such as the fan and extending the service life of the entire air-conditioning unit; and keeping the filter in good condition helps maintain the designed wind resistance and reduce the additional energy consumption required for system operation. Clogged filters will increase the workload of the fan and consume more electricity.

[0015] Furthermore, it also includes a disinfection pipeline connected to the return air main pipe, the disinfection pipeline includes an ozone delivery pipeline and a disinfection exhaust pipeline, the disinfection exhaust pipeline is sequentially provided with an exhaust electric valve and a disinfection exhaust fan, and the ozone delivery pipeline is also provided with a switch valve.

[0016] Beneficial effects: when disinfection is required, close the first electric valve on the fresh air duct, the exhaust electric valve on the disinfection exhaust duct, and the disinfection exhaust fan, open the switch valve and the blower on the ozone delivery pipeline, deliver ozone to the return air section of the air-conditioning unit, and use the blower to circulate air to achieve disinfection; after disinfection is completed, open the first electric valve on the fresh air duct, the exhaust electric valve on the disinfection exhaust duct, the disinfection exhaust fan, and the blower, use the disinfection exhaust fan to discharge the residual disinfection gas, and then the air-conditioning unit resumes normal operation.

[0017] Furthermore, the fan section is provided with an air supply fan, and the controller is used to control the first electric valve on the fresh air duct to be interlocked with the air supply fan and to be opened and closed simultaneously.

[0018] Beneficial effects: Interlocking control ensures the synchronization of fresh air introduction and air supply process; when the air supply fan starts, the first electric valve automatically opens to allow fresh air to enter the system; conversely, when the air supply fan stops, the first electric valve automatically closes to prevent fresh air from flowing in; such a design is conducive to maintaining the stability and efficiency of the system and ensuring that the air-conditioning unit provides an appropriate amount of fresh air on demand.

[0019] Furthermore, the humidification air outlet section is provided with an electric humidifier, and the controller is used to control the interlocking opening and closing of the electric humidifier and the air supply fan.

[0020] Beneficial effects: Interlocking control ensures that the electric humidifier starts working only when the blower is running; the purpose of this is to ensure that the humidified air can be effectively and quickly distributed to the entire air-conditioning coverage area, avoiding local over-humidification or water droplet condensation caused by the humidifier working in a windless state, thereby improving humidification efficiency and uniformity.

[0021] Furthermore, silencers are provided on the air supply duct and the return air main duct.

[0022] Beneficial effect: During the operation of the air-conditioning system, the fan, air duct and other components will generate certain aerodynamic noise, which is more significant when the air is delivered at high speed. The installation of a muffler can effectively reduce the airflow noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the air conditioning system of the utility model. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific implementation methods:

[0025] The marks in the drawings of the specification include: fresh air section 1, fresh air duct 11, first electric valve 110, primary filter section 2, differential pressure sensor 28, primary return air section 3, surface cooling plate section 4, secondary return air section 5, return air main 51, return air duct 52, muffler 59, fan section 6, air supply fan 61, flow equalizing section 7, medium efficiency filter section 8, humidification air outlet section 9, air supply duct 91, first pressure sensor 911, ozone delivery pipeline 101, switch valve 1011, disinfection exhaust pipeline 102, exhaust electric valve 1021, disinfection exhaust fan 1022, printing workshop 200.

[0026] Embodiment 1

[0027] like Figure 1As shown, an air conditioning system for a printing workshop includes an air conditioning unit and a controller. The controller in this embodiment is a PLC controller. The air conditioning unit includes a fresh air section 1, a primary filter section 2, a primary return air section 3, a surface cooling plate section 4, a secondary return air section 5, a fan section 6, a flow equalization section 7, a medium efficiency filter section 8, and a humidification outlet section 9 in sequence; the fresh air section 1 is connected to a fresh air duct 11, and a first electric valve 110 electrically connected to the controller is provided on the fresh air duct 11; the humidification outlet section 9 is connected to the printing workshop 200 through an air supply duct 91, and a first pressure sensor 911 electrically connected to the controller is provided in the air supply duct 91; return air ducts 52 are provided on both the primary return air section 3 and the secondary return air section 5, and the two return air ducts 52 are connected to the printing workshop 200 through a return air main duct 51; silencers 59 are also provided on the air supply duct 91 and the return air main duct 51.

[0028] A second pressure sensor electrically connected to the controller is provided in the printing workshop 200. The controller is used to control the air supply volume of the fan section 6 to keep the air volume constant according to the signal of the first pressure sensor 911. This method can ensure that the air conditioning system can meet the air volume required by the workshop while avoiding energy waste caused by excessive air volume, and also reduce the additional energy consumption caused by insufficient air volume, such as additional cycles. The controller is also used to control the opening of the first electric valve 110 on the fresh air duct 11 to keep the pressure constant according to the signal of the second pressure sensor. The second pressure sensor is located in the printing workshop 200, which monitors the pressure change of the workshop and feeds back to the controller, and the controller adjusts the opening of the first electric valve 110 on the fresh air duct 11 accordingly. This can ensure that the fresh air supply matches the actual needs of the workshop, avoid energy consumption caused by excessive introduction of fresh air, and also ensure the positive pressure or slightly positive pressure state inside the workshop, reduce the intrusion of external pollutants, and achieve energy saving while ensuring indoor air quality.

[0029] In this embodiment, the primary filter section 2 is provided with a primary plate filter, and the medium filter section 8 is provided with a medium bag filter. Both the primary filter section 2 and the medium filter section 8 are provided with a pressure difference sensor 28 for detecting the pressure at both ends of the filter, and the pressure difference sensor 28 is electrically connected to an alarm; specifically, the pressure difference of the primary plate filter in this embodiment is less than 100 Pa, and the pressure difference of the medium bag filter is less than 200 Pa. As the filter is used for a longer time, dust and other impurities will accumulate on the filter medium, which will cause the pressure difference on both sides of the filter to gradually increase. The pressure difference sensor 28 can continuously monitor this pressure change, thereby reflecting the degree of filter blockage; when the filter is blocked to a certain extent, that is, the pressure difference reaches the preset threshold, the pressure difference sensor 28 will trigger the alarm to notify the maintenance personnel that the filter needs to be cleaned or replaced, so as to ensure that the air volume of the air conditioning system will not be reduced due to filter blockage, and maintain the normal operating efficiency and air quality of the system.

[0030] The disinfection pipeline 101 is connected to the return air main pipe 51, and the disinfection pipeline includes an ozone delivery pipeline 101 and a disinfection exhaust pipeline 102. The disinfection exhaust pipeline 102 is sequentially provided with an exhaust electric valve 1021 and a disinfection exhaust fan 1022. The ozone delivery pipeline 101 is also provided with a switch valve 1011; when disinfection is required, the first electric valve 110 on the fresh air pipe 11, the exhaust electric valve 1021 on the disinfection exhaust pipeline 102, and the disinfection exhaust fan 1022 are closed. 22. Open the switch valve 1011 and the air blower 61 on the ozone delivery pipeline 101 to deliver ozone to the return air section of the air-conditioning unit, and use the air blower 61 to circulate air to achieve disinfection; after the disinfection is completed, open the first electric valve 110 on the fresh air duct 11, the exhaust electric valve 1021 on the disinfection exhaust pipeline 102, the disinfection exhaust fan 1022, and the air blower 61, and use the disinfection exhaust fan 1022 to discharge the residual disinfection gas, and then the air-conditioning unit resumes normal operation.

[0031] Specifically, the fan section 6 is provided with an air supply fan 61, and the controller is used to control the first electric valve 110 on the fresh air duct 11 and the air supply fan 61 to be interlocked and opened and closed at the same time, thereby ensuring the synchronization of the fresh air introduction and the air supply process; the humidification air outlet section 9 is provided with an electric humidifier, and the controller is used to control the interlocking opening and closing of the electric humidifier and the air supply fan 61, and the interlocking control ensures that the electric humidifier starts working only when the air supply fan 61 is running; the purpose of this is to ensure that the humidified air can be effectively and quickly distributed to the entire air-conditioning coverage area, avoiding local over-humidification or water droplet condensation caused by the humidifier working in a windless state, thereby improving the humidification efficiency and uniformity.

[0032] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An air conditioning system for a printing workshop, comprising an air conditioning unit and a controller, characterized in that: The air-conditioning unit comprises a fresh air section, a primary filter section, a primary return air section, a surface cooling plate section, a secondary return air section, a fan section, a flow equalizing section, a medium-efficiency filter section, and a humidification outlet section in sequence; the fresh air section is connected to a fresh air duct, and a first electric valve electrically connected to a controller is provided on the fresh air duct; the humidification outlet section is connected to a printing workshop through an air supply duct, and a first pressure sensor electrically connected to the controller is provided in the air supply duct; return air ducts are provided on both the primary return air section and the secondary return air section, and the two return air ducts are connected to the printing workshop through a return air main duct; a second pressure sensor electrically connected to the controller is provided in the printing workshop, and the controller is used to control the air supply volume of the fan section to keep the air volume constant according to the signal of the first pressure sensor, and is used to control the opening of the first electric valve on the fresh air duct to keep the pressure constant according to the signal of the second pressure sensor.

2. The air conditioning system for a printing workshop according to claim 1, characterized in that: The primary filter section is provided with a primary plate filter, the medium filter section is provided with a medium bag filter, both the primary filter section and the medium filter section are provided with a differential pressure sensor for detecting the pressure at both ends of the filter, and the differential pressure sensor is electrically connected to an alarm.

3. The air conditioning system for a printing workshop according to claim 2, characterized in that: It also includes a disinfection pipeline connected to the return air main pipe, the disinfection pipeline includes an ozone delivery pipeline and a disinfection exhaust pipeline, the disinfection exhaust pipeline is sequentially provided with an exhaust electric valve and a disinfection exhaust fan, and the ozone delivery pipeline is also provided with a switch valve.

4. The air conditioning system for a printing workshop according to claim 3, characterized in that: The fan section is provided with an air supply fan, and the controller is used to control the first electric valve on the fresh air duct to be interlocked with the air supply fan and opened and closed simultaneously.

5. The air conditioning system for a printing workshop according to claim 4, characterized in that: The humidification air outlet section is provided with an electric humidifier, and the controller is used to control the interlocking opening and closing of the electric humidifier and the air supply fan.

6. The air conditioning system for a printing workshop according to claim 5, characterized in that: The air supply pipe and the return air main pipe are both provided with mufflers.

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