CN112303794A - Automatic control system and control method for air purification ventilation air conditioner - Google Patents
Automatic control system and control method for air purification ventilation air conditioner Download PDFInfo
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- CN112303794A CN112303794A CN202011243703.9A CN202011243703A CN112303794A CN 112303794 A CN112303794 A CN 112303794A CN 202011243703 A CN202011243703 A CN 202011243703A CN 112303794 A CN112303794 A CN 112303794A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 31
- 238000004887 air purification Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000007710 freezing Methods 0.000 claims abstract description 51
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000005057 refrigeration Methods 0.000 claims abstract description 21
- 238000004378 air conditioning Methods 0.000 claims abstract description 17
- 238000000746 purification Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 230000009290 primary effect Effects 0.000 claims abstract description 7
- 230000008014 freezing Effects 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 19
- 238000004659 sterilization and disinfection Methods 0.000 claims description 15
- 239000000498 cooling water Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 230000003993 interaction Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 229920000742 Cotton Polymers 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 4
- 238000007791 dehumidification Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 238000005202 decontamination Methods 0.000 claims 2
- 230000003588 decontaminative effect Effects 0.000 claims 2
- 230000004069 differentiation Effects 0.000 claims 1
- 230000010354 integration Effects 0.000 claims 1
- 230000006872 improvement Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F6/00—Air-humidification, e.g. cooling by humidification
- F24F6/18—Air-humidification, e.g. cooling by humidification by injection of steam into the air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Fluid Mechanics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides an automatic control system of an air purification ventilation air conditioner, which is used for a workshop and comprises a combined purification air conditioner control system, a workshop temperature and humidity/pressure difference monitoring system, a refrigeration station water system and a PLC (programmable logic controller); the combined type purifying air-conditioning system comprises an air inlet pipeline, an air return pipeline, a shutdown anti-freezing protection device, a fresh air valve, a primary-effect filter screen, a preheating device, a blower, a cold water device, a steam device, a middle-effect filter screen, an ozone generating device and an air return valve; the invention also provides an automatic control method of the purification workshop, the automatic control system of the air purification ventilation air conditioner comprises a combined purification air conditioner control system, a workshop temperature and humidity/pressure difference monitoring system, a refrigeration station water system and a PLC (programmable logic controller), and the temperature, humidity, pressure and the like of each workshop can be automatically ensured to be proper through accurate control.
Description
Technical Field
The invention relates to the technical field of control systems, in particular to an automatic control system and a control method for an air purification ventilation air conditioner.
Background
In workplaces such as hospitals and factories, air quality is strictly required, the circulation of internal air needs to be maintained, and polluted air in the workplace is discharged through an air exhaust system.
The workshop in the factory is the basic unit of enterprise internal organization production, also is the first-level organization of enterprise production administrative management, is formed by a plurality of workshop sections or production teams, it sets up according to the professional nature of each stage of enterprise internal product production or each component of product and the professional nature of each auxiliary production activity, possess factory building or place, machine equipment, instrument and certain producer, technical staff and managers that accomplish the production task necessary, the workshop has four characteristics: (1) it is a collective ground of elements of productivity formed according to the specialized principle; (2) it is an intermediate link of enterprise management between a factory and a production team; (3) the products of the workshop are generally semi-finished products (except finished workshops) or internal products of enterprises, but not commodities; (4) the workshop is not an independent commodity production and management unit and generally does not directly generate economic connection to the outside.
The ward, operating room or medicine storeroom in hospital all generally adopt centralized air-conditioning system, because the environmental cleanliness requirement of many departments of hospital is higher, so the ventilation volume of its room is several times of that of ordinary air-conditioning room, especially high-grade clean operating room, the number of times of ventilation per hour is from tens to hundreds. In addition, the tail end of the air outlet of the air conditioning system is also specially provided with a high-efficiency air filter.
The existing air draft system is single, and the control precision is not accurate. There is no efficient control method for temperature, humidity, pressure, etc. in the air, and a high waste of energy, which results in higher energy consumption, is obvious.
Accordingly, there is a need for improvements in the art.
Disclosure of Invention
The invention aims to provide an efficient automatic control system and method for an air purification ventilation air conditioner.
In order to solve the technical problem, the invention provides an automatic control system of an air purification ventilation air conditioner, which is used for a workshop and comprises a combined purification air conditioner control system, a workshop temperature and humidity/pressure difference monitoring system, a refrigeration station water system and a PLC (programmable logic controller);
the combined type purifying air-conditioning system comprises an air inlet pipeline, an air return pipeline, a shutdown anti-freezing protection device, a fresh air valve, a primary-effect filter screen, a preheating device, a blower, a cold water device, a steam device, a middle-effect filter screen, an ozone generating device and an air return valve;
the workshop temperature and humidity/pressure difference control system comprises a return air temperature sensor, a return air humidity sensor, an indoor temperature sensor, an indoor humidity sensor, an indoor pressure sensor, an air supply speed sensor and a man-machine interaction device;
the steam device comprises a steam heating device and a steam humidifying device; the steam heating device is used for heating air, and the steam humidifying device is used for humidifying air;
the PLC is respectively in signal connection with a return air temperature sensor, a return air humidity sensor, an indoor temperature sensor, an indoor humidity sensor, an indoor pressure sensor, a blower, a fresh air valve, a return air valve, a steam heating device, a steam humidifying device and a shutdown anti-freezing protection device;
a shutdown anti-freezing protection device, a fresh air valve, a primary filter screen, a preheating device, a blower, a cold water device, a steam heating device, a steam humidifying device and a primary filter screen are sequentially arranged in the air inlet pipeline from an inlet to an outlet;
the outlet of the air inlet pipeline is communicated with the air inlet of the workshop through an air supply valve;
the air outlet of the workshop is connected with the air inlet pipeline through an air return pipeline provided with an air return valve, the outlet of the air return pipeline is positioned between the primary filter screen and the preheating device,
the PLC is respectively connected with the shutdown anti-freezing protection device, the fresh air valve, the preheating device, the air feeder, the cold water device, the steam heating device, the steam humidifying device, the ozone generating device, the return air valve and the human-computer interaction device.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
a return air temperature sensor and a return air humidity sensor are arranged in the return air pipeline;
an air inlet temperature sensor is arranged at an air inlet of the air inlet pipeline;
an air outlet of the air inlet pipeline is provided with an air supply air speed sensor;
an indoor temperature sensor, an indoor humidity sensor and an indoor pressure sensor are arranged in the working room;
the PLC is respectively in signal connection with an air return temperature sensor, an air return humidity sensor, an air inlet temperature sensor, an air supply air speed sensor, an indoor temperature sensor, an indoor humidity sensor and an indoor pressure sensor.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
the shutdown anti-freezing protection device comprises a constant-temperature water circulation pipeline and a constant-temperature water tank, the constant-temperature water circulation pipeline is connected with the constant-temperature water tank, a circulating water pump is arranged on the constant-temperature water circulation pipeline, and the constant-temperature water circulation pipeline is arranged on the inner wall of an inlet of the air inlet pipeline.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
the primary filter screen comprises four grade filter cotton layers of G1 grade, G2 grade, G3 grade and G4 grade and is used for filtering dust particles with the particle size of more than 5 mu m;
the medium-efficiency filter screen comprises four grades of filter cotton layers of F5 grade, F6 grade, F7 grade and F8 grade and is used for filtering dust particles with the particle size of 1-5 mu m.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
the ozone generating device comprises an ozone generator and an electric valve, wherein the outlet of the ozone generator is connected with the outlet of the air inlet pipeline through the electric valve by a pipeline.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
flow/wind speed sensing devices are arranged at the front end and the rear end of the primary filter screen and the middle filter screen and are in signal connection with the PLC.
As an improvement of the automatic control system of the air purification ventilation air conditioner of the invention:
the refrigerating station water system comprises a first refrigerating pump, a second refrigerating pump, a third refrigerating pump, a fourth refrigerating pump, a heat exchange device and a cooling tower, wherein a water inlet pipeline is connected with a heat release pipeline inlet of the heat exchange device after passing through the first refrigerating pump and the second refrigerating pump which are arranged in parallel;
the PLC is respectively connected with the first freezing pump, the second freezing pump, the third freezing pump and the fourth freezing pump through signals, and the water inlet pipeline and the water outlet pipeline are respectively connected with the water outlet and the water inlet of the water cooling device.
The invention also provides an automatic control method for the purification workshop, which comprises the following steps:
1) and temperature control: the PLC compares a return air temperature signal detected by a return air temperature sensor in the return air pipeline with a temperature set value, performs PID adjustment, performs operation according to the functional relation of proportion, integral and differential, and controls the opening temperature reduction of an automatic proportional adjustment water cooling device or the opening temperature increase of a proportional opening steam heating device according to the operation result so as to achieve the purpose of controlling the temperature;
2) and humidity control: the PLC compares a return air humidity signal detected by a return air humidity sensor in the return air pipeline with a humidity set value, and then automatically adjusts the opening of the cold water device for dehumidification or opens the steam humidifying device for humidification in proportion;
3) and controlling the wind speed: the PLC controller automatically adjusts the output frequency of the air feeder in proportion after comparing the air supply speed signal detected by the air supply speed sensor with a set air speed value;
4) and monitoring the temperature, the humidity and the pressure difference of the room: the PLC controller uploads signals of temperature, humidity and pressure of a workshop detected by the indoor temperature sensor, the indoor humidity sensor and the indoor pressure sensor to a computer for display/storage/recording;
5) when the disinfection is selected, the start and stop of an ozone generator of the ozone generating device can be controlled according to the set disinfection time; when in disinfection, the fresh air valve and the corresponding blower are closed; when the set disinfection time is reached and the disinfection is finished, automatically recovering to the working state, and starting an ozone generator of the ozone generating device, wherein the starting time can be set;
6) the protection of freezing prevention, when the temperature of the fresh air inlet detected by the air inlet temperature sensor is lower than 10 ℃, the judgment is made in winter; in winter, the steam preheating valve of the preheating device is kept 10% open when the device is shut down.
As an improvement on the automatic control method of the cleaning workshop of the invention:
the PLC compares the room pressure difference set value with the pressure signal of the workshop:
if the pressure signal of the workshop does not meet the set pressure difference value, taking the temperature at the moment as the initial delay temperature, and entering a 15-second delay state;
if the pressure signal of the workshop does not meet the set pressure difference value all the time in the 15-second delay state, the PLC adjusts the opening of the air supply valve according to the initial delay temperature and adjusts the pressure difference.
As an improvement on the automatic control method of the cleaning workshop of the invention:
the working process of the refrigeration station water system comprises the following steps:
1) starting a first freezing pump and a third freezing pump;
2) the chilled return water enters from the water inlet pipeline, enters a heat release pipeline of the heat exchange device after passing through the first refrigeration pump, and exchanges heat with the low-temperature cooling water in a heat absorption pipeline of the heat exchange device to become normal-temperature cooling water;
3) and the normal temperature cooling water enters the cooling tower through the third refrigerating pump to release heat, becomes low temperature cooling water, enters the heat absorption pipeline of the heat exchange device, exchanges heat with the cold return water in the heat release pipeline of the heat exchange device, and becomes freezing water supply.
The air purification ventilation air conditioner automatic control system has the technical advantages that:
the automatic control system of the air purification ventilation air conditioner comprises a combined purification air conditioner control system, a workshop temperature and humidity/pressure difference monitoring system, a refrigeration station water system and a PLC (programmable logic controller), and can automatically ensure the suitability of the temperature, the humidity, the pressure and the like of each workshop through accurate control.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a combined type purifying air-conditioning control system of an automatic control system of an air purifying ventilating air-conditioning of the present invention;
FIG. 2 is a schematic structural diagram of a refrigeration station water system of the automatic control system for air purification, ventilation and air conditioning of the present invention;
fig. 3 is a schematic structural diagram of the PLC controller 30 of the automatic control system for air purification, ventilation and air conditioning of the present invention in signal connection with the combined purification and air conditioning control system, the plant humiture/pressure difference monitoring system and the refrigeration station water system.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Embodiment 1, an air purification ventilation air-conditioning automatic control system, as shown in fig. 1-3, is used in a workshop 13, and includes a combined purification air-conditioning control system, a workshop temperature/humidity/pressure difference monitoring system, a refrigeration station water system, and a PLC controller 30.
The combined purifying air conditioning system comprises an air inlet pipeline 1, an air return pipeline 19, a shutdown anti-freezing protection device 22, a fresh air valve 2, a primary effect filter screen 3, a preheating device 4, a blower 5, a cold water device 6, a steam device, a medium effect filter screen 9, an ozone generating device 10 and an air return valve 20.
When the system heats in winter, the outside temperature is very low, and if only one group of heating is used, the set temperature of the system can not be achieved. Therefore, the automatic control system of the air purification ventilation air conditioner is provided with two groups of heating devices (the preheating device 4 and the steam heating device 7), the external cold air is heated by the preheating device 4, the temperature is raised a little, and then the external cold air is heated by the steam heating device 7 to reach the temperature set by the system.
The workshop temperature and humidity/pressure difference control system comprises a return air temperature sensor 18, a return air humidity sensor 17, an indoor temperature sensor 14, an indoor humidity sensor 15, an indoor pressure sensor 16, an air supply speed sensor 11 and a man-machine interaction device 37.
The steam device comprises a steam heating device 7 and a steam humidifying device 8; the steam heating device 7 is used for heating air, and the steam humidifying device 8 is used for humidifying air.
The PLC 30 is respectively connected with the return air temperature sensor 18, the return air humidity sensor 17, the indoor temperature sensor 14, the indoor humidity sensor 15, the indoor pressure sensor 16, the blower 5, the control device of the fresh air valve 2, the control device of the return air valve 20, the steam heating device 7, the steam humidifying device 8 and the shutdown anti-freezing protection device 22 through signals. The PLC controller 30 is a Siemens S7200-CPU224XP controller.
The air inlet pipeline 1 is sequentially provided with a shutdown anti-freezing protection device 22, a fresh air valve 2, a primary effect filter screen 3, a preheating device 4, a blower 5, a cold water device 6, a steam heating device 7, a steam humidifying device 8 and a primary effect filter screen 9 from an inlet to an outlet.
The shutdown anti-freezing protection device 22 comprises a constant-temperature water circulation pipeline and a constant-temperature water tank, the constant-temperature water circulation pipeline is connected with the constant-temperature water tank, a circulating water pump is arranged on the constant-temperature water circulation pipeline, and the constant-temperature water circulation pipeline is arranged on the inner wall of the inlet of the air inlet pipeline 1. PLC controller 30 can be through air inlet temperature sensor 21 continuous detection ambient temperature, if detect ambient temperature and be less than 0 degree, PLC controller 30 can start circulating water pump, lets water flow to reach frost-proof purpose.
The primary filter screen 3 comprises four grades of filter cotton layers of G1 grade, G2 grade, G3 grade and G4 grade and is used for filtering dust particles with the particle size of more than 5 mu m.
The medium-efficiency filter screen 9 comprises four grades of filter cotton layers of F5 grade, F6 grade, F7 grade and F8 grade and is used for filtering dust particles with the particle size of 1-5 mu m.
The ozone generating device 10 comprises an ozone generator and an electric valve, wherein the outlet of the ozone generator is connected with the outlet of the air inlet pipeline 1 through the electric valve by a pipeline, and the outlet of the air inlet pipeline 1 is communicated with the air inlet of the workshop 13 through an air supply valve 12;
an air outlet of the workshop 13 is connected with the air inlet pipeline 1 through a return air pipeline 19 provided with a return air valve 20, an outlet of the return air pipeline 19 is positioned between the primary filter screen 3 and the preheating device 4, and a return air temperature sensor 18 and a return air humidity sensor 17 are arranged in the return air pipeline 19; the temperature sensor is used for detecting the return air temperature and the return air humidity.
An air inlet of the air inlet pipeline 1 is provided with an air inlet temperature sensor 21, the air inlet temperature sensor 21 is used for detecting the atmospheric temperature and judging whether the atmospheric temperature is in winter, so that whether the preheating device 4 is started to ensure the room temperature is determined, and the combined type purification air-conditioning system can be prevented from being started in a supercooled environment.
An air outlet of the air inlet pipeline 1 is provided with an air supply air speed sensor 11, and the air supply air speed sensor 11 is used for detecting the air speed of supplied air.
The work room 13 may include a dosing room, a capping room, a bottle wash, a hospital room, an operating room, or a drug storage room, among others.
An indoor temperature sensor 14, an indoor humidity sensor 15 and an indoor pressure sensor 16 are arranged in the workshop 13, and the indoor temperature sensor 14, the indoor humidity sensor 15 and the indoor pressure sensor 16 respectively acquire the temperature, the humidity and the pressure of the workshop 13.
The indoor temperature sensor 14 and the indoor humidity sensor 15 are wall-mounted temperature and humidity sensors, and the indoor pressure sensor 16 is a digital display differential pressure sensor.
The PLC 30 is respectively connected with the shutdown anti-freezing protection device 22, the fresh air valve 2, the preheating device 4, the blower 5, the cold water device 6, the steam device, the ozone generating device 10, the temperature sensor, the humidity sensor, the pressure sensor, the return air valve 20 and the man-machine interaction device 37.
The human-computer interaction device 37 may use a resistive touch screen, the human-computer interaction device 37 uses a kunlun/wilon 10-inch touch screen, and a user may preset a temperature set value, a humidity set value, a wind speed set value, a room temperature set value, and a room pressure difference set value in the PLC controller 30 through the human-computer interaction device 37 as a basis for subsequent automatic control.
The automatic control system for the air purification ventilation air conditioner further comprises an alarm device 38, wherein the alarm device 38 is a plurality of audible and visual alarms, and the audible and visual alarms can be used for giving an alarm when each device breaks down or operates abnormally.
The PLC controller 30 can detect a screen blockage. Flow/wind speed sensing devices are arranged at the front end and the rear end of the primary filter screen 3 and the middle filter screen 9, and are used for collecting the air inlet and outlet strength information passing through the filter screens and obtaining air inlet and outlet strength signals; and if the difference of the air inlet strength and the air outlet strength exceeds a threshold value, judging that the filter screen is blocked.
The control method of the automatic control system of the air purification ventilation air conditioner comprises the following steps:
1) and temperature control: the PLC 30 compares the return air temperature signal detected by the return air temperature sensor 18 in the return air pipeline 19 with a temperature set value, performs PID adjustment, performs calculation according to the functional relation of proportion, integral and differential, and controls the opening of the automatic proportional control water cooling device 6 to reduce the temperature or controls the opening of the proportional opening steam heating device 7 to increase the temperature according to the calculation result so as to achieve the purpose of controlling the temperature.
2) And humidity control: the PLC 30 compares the return air humidity signal detected by the return air humidity sensor 17 in the return air pipeline 19 with a humidity set value, and then automatically adjusts the opening degree of the water cooling device 6 to dehumidify or proportionally opens the opening degree of the steam humidifying device 8 to humidify.
3) And controlling the wind speed: the PLC controller 30 compares the air supply speed signal detected by the air supply speed sensor 11 with a set air speed value, and then automatically adjusts the output frequency of the blower 5 in a proportional manner.
4) And monitoring the temperature, the humidity and the pressure difference of the room: the PLC 30 is used for uploading the signals of the temperature, the humidity and the pressure of the workshop detected by the indoor temperature sensor 14, the indoor humidity sensor 15 and the indoor pressure sensor 16 to a computer for display/storage/record.
The PLC controller 30 compares the room pressure difference setting value with the pressure signal of the plant, performs PID adjustment, performs calculation according to a functional relationship of proportion, integral, and differential, and automatically adjusts the opening of the blast valve 12 according to the calculation result to adjust the pressure difference.
When the room personnel flow to open and close the door, in order to avoid the pressure difference error control or the error recording, the PLC 30 keeps the original working state, delays for 15 seconds and then carries out control adjustment.
The signal detected by the indoor humidity sensor 15 functions to control the humidity in the room. When the system operates, the PLC detects the humidity in real time through the indoor humidity sensor, then sends the detection value to the humidity PID regulator, the PID regulator calculates according to the input deviation value and the function relation of proportion, integral and differential, and the calculation result is sent to the humidifier or the dehumidification steam valve.
The method specifically comprises the following steps: the PLC 30 compares the set value of the room pressure difference with the pressure signal of the workshop;
if the pressure signal of the workshop does not meet the set pressure difference value, taking the temperature at the moment as the initial delay temperature, and entering a 15-second delay state;
if the pressure signal of the workshop does not meet the set pressure difference value all the time in the time delay state of 15 seconds, the PLC 30 adjusts the opening degree of the blast valve 12 according to the initial time delay temperature and adjusts the pressure difference;
5) when the disinfection is selected, the start and stop of the ozone generator of the ozone generating device 10 can be controlled according to the set disinfection time. When in disinfection, the fresh air valve 2 and the corresponding blower 5 are closed; when the set disinfection time is reached and the disinfection is finished, the working state is automatically recovered, and the ozone generator of the ozone generating device 10 is started, wherein the starting time can be set.
6) And (4) anti-freezing protection, namely judging the temperature is winter when the inlet air temperature sensor 21 detects that the temperature of the fresh air inlet is lower than 10 ℃. In winter, the steam preheating valve of the preheating device 4 remains 10% open at shutdown. The opening degree can be set according to actual conditions.
The steam preheating valve of the preheating device 4 with 10% opening has the following functions: when the system is stopped in winter, in order to prevent the steam preheating valve from being completely closed, the residual steam in the air inlet pipeline 1 is cooled and frozen to freeze the equipment. And the opening degree of 10 percent is reserved, so that the steam can be in a flowing state all the time, and the anti-freezing protection effect is achieved.
The refrigerating station water system comprises a first freezing pump 31, a second freezing pump 32, a third freezing pump 33, a fourth freezing pump 34, a heat exchange device 35 and a cooling tower 36, a water inlet pipeline is connected with an inlet of a heat release pipeline of the heat exchange device 35 after passing through the first freezing pump 31 and the second freezing pump 32 which are arranged in parallel, an outlet of the heat release pipeline of the heat exchange device 35 is connected with an inlet of the cooling tower 36 after passing through the third freezing pump 33 and the fourth freezing pump 34 which are arranged in parallel, and an outlet of the cooling tower 36 is connected with a water outlet pipeline after passing through a heat absorption pipeline of the heat exchange device 35. The cooling tower 36 is used for cooling the chilled water.
The PLC 30 is respectively connected with the first freezing pump 31, the second freezing pump 32, the third freezing pump 33 and the fourth freezing pump 34 through signals, and the water inlet pipeline and the water outlet pipeline are respectively connected with the water outlet and the water inlet of the water cooling device 6.
When the freezing automatic start-up: starting the first freezing pump 31 for the first time and starting the second freezing pump 32 for the second time, and circulating according to times; the three-refrigerant pump 33 and the four-refrigerant pump 34 perform the same operation. The two pumps are started in sequence, and if one pump works for a long time and does not have a rest, the pump is easy to damage; the other pump is left unused for a long time and is easily affected with damp.
The working process of the refrigeration station water system comprises the following steps:
1) starting a first freezing pump 31 and a third freezing pump 33;
2) the chilled return water enters from the water inlet pipeline, passes through the first chilling pump 31 and then enters the heat release pipeline of the heat exchange device 35, and exchanges heat with the low-temperature cooling water in the heat absorption pipeline of the heat exchange device 35 to become normal-temperature cooling water;
3) and the normal temperature cooling water enters the cooling tower 36 through the third refrigerating pump 33 for heat release, becomes low temperature cooling water, enters the heat absorption pipeline of the heat exchange device 35, and exchanges heat with the cold return water in the heat release pipeline of the heat exchange device 35 to become freezing water supply.
Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (10)
1. Air purification ventilation air conditioner automatic control system for workplace (13), its characterized in that: the system comprises a combined type purification air-conditioning control system, a workshop temperature and humidity/pressure difference monitoring system, a refrigeration station water system and a PLC (programmable logic controller) (30);
the combined type purification air-conditioning system comprises an air inlet pipeline (1), an air return pipeline (19), a shutdown anti-freezing protection device (22), a fresh air valve (2), a primary effect filter screen (3), a preheating device (4), a blower (5), a cold water device (6), a steam device, a middle effect filter screen (9), an ozone generating device (10) and an air return valve (20);
the workshop temperature and humidity/pressure difference control system comprises a return air temperature sensor (18), a return air humidity sensor (17), an indoor temperature sensor (14), an indoor humidity sensor (15), an indoor pressure sensor (16), an air supply speed sensor (11) and a man-machine interaction device (37);
the steam device comprises a steam heating device (7) and a steam humidifying device (8); the steam heating device (7) is used for heating air, and the steam humidifying device (8) is used for humidifying air;
the PLC (30) is respectively in signal connection with a return air temperature sensor (18), a return air humidity sensor (17), an indoor temperature sensor (14), an indoor humidity sensor (15), an indoor pressure sensor (16), a blower (5), a fresh air valve (2), a return air valve (20), a steam heating device (7), a steam humidifying device (8) and a shutdown anti-freezing protection device (22);
a shutdown anti-freezing protection device (22), a fresh air valve (2), a primary effect filter screen (3), a preheating device (4), a blower (5), a cold water device (6), a steam heating device (7), a steam humidifying device (8) and a medium effect filter screen (9) are sequentially arranged in the air inlet pipeline (1) from an inlet to an outlet;
the outlet of the air inlet pipeline (1) is communicated with the air inlet of the workshop (13) through an air supply valve (12);
the air outlet of the workshop (13) is connected with the air inlet pipeline (1) through an air return pipeline (19) provided with an air return valve (20), the outlet of the air return pipeline (19) is positioned between the primary filter screen (3) and the preheating device (4),
the PLC (30) is respectively connected with the shutdown anti-freezing protection device (22), the fresh air valve (2), the preheating device (4), the air feeder (5), the cold water device (6), the steam heating device (7), the steam humidifying device (8), the ozone generating device (10), the return air valve (20) and the man-machine interaction device (37).
2. The automatic control system of air purification ventilation air conditioner according to claim 1, characterized in that:
a return air temperature sensor (18) and a return air humidity sensor (17) are arranged in the return air pipeline (19);
an air inlet temperature sensor (21) is arranged at an air inlet of the air inlet pipeline (1);
an air outlet of the air inlet pipeline (1) is provided with an air supply air speed sensor (11);
an indoor temperature sensor (14), an indoor humidity sensor (15) and an indoor pressure sensor (16) are arranged in the working room (13);
the PLC (30) is respectively in signal connection with the return air temperature sensor (18), the return air humidity sensor (17), the inlet air temperature sensor (21), the air supply air speed sensor (11), the indoor temperature sensor (14), the indoor humidity sensor (15) and the indoor pressure sensor (16).
3. The automatic control system of air purification ventilation air conditioner according to claim 2, characterized in that:
the shutdown anti-freezing protection device (22) comprises a constant-temperature water circulation pipeline and a constant-temperature water tank, the constant-temperature water circulation pipeline is connected with the constant-temperature water tank, a circulating water pump is arranged on the constant-temperature water circulation pipeline, and the constant-temperature water circulation pipeline is arranged on the inner wall of an inlet of the air inlet pipeline (1).
4. The automatic control system of air purification ventilation air conditioner according to claim 3, characterized in that:
the primary filter screen (3) comprises four grade filter cotton layers of G1 grade, G2 grade, G3 grade and G4 grade and is used for filtering dust particles with the particle size of more than 5 mu m;
the medium-efficiency filter screen (9) comprises four grades of filter cotton layers of F5 grade, F6 grade, F7 grade and F8 grade and is used for filtering dust particles with the particle size of 1-5 mu m.
5. The automatic control system of air purification ventilation air conditioner according to claim 4, characterized in that:
the ozone generating device (10) comprises an ozone generator and an electric valve, and the outlet of the ozone generator is connected with the outlet of the air inlet pipeline (1) through the electric valve by a pipeline.
6. The automatic control system of air purification ventilation air conditioner of claim 5, characterized in that:
flow/wind speed sensing devices are arranged at the front end and the rear end of the primary filter screen (3) and the middle filter screen (9) and are in signal connection with the PLC (programmable logic controller) (30).
7. The automatic control system of air purification ventilation air conditioner of claim 6, characterized in that:
the refrigeration station water system comprises a first refrigeration pump (31), a second refrigeration pump (32), a third refrigeration pump (33), a fourth refrigeration pump (34), a heat exchange device (35) and a cooling tower (36), wherein a water inlet pipeline is connected with an inlet of a heat release pipeline of the heat exchange device (35) after passing through the first refrigeration pump (31) and the second refrigeration pump (32) which are arranged in parallel, an outlet of the heat release pipeline of the heat exchange device (35) is connected with an inlet of the cooling tower (36) through the third refrigeration pump (33) and the fourth refrigeration pump (34) which are arranged in parallel, and an outlet of the cooling tower (36) is connected with a water outlet pipeline after passing through a heat absorption pipeline of the heat exchange device (35);
the PLC (30) is respectively in signal connection with the first freezing pump (31), the second freezing pump (32), the third freezing pump (33) and the fourth freezing pump (34), and the water inlet pipeline and the water outlet pipeline are respectively connected with the water outlet and the water inlet of the water cooling device (6).
8. Automatic control method for a clean room using an automatic control system for air purification ventilation air-conditioning according to any of claims 1 to 7, characterized in that: the method comprises the following steps:
1) and temperature control: the PLC (30) compares a return air temperature signal detected by a return air temperature sensor (18) in a return air pipeline (19) with a temperature set value, performs PID (proportion integration differentiation) regulation, performs calculation according to a function relation of proportion, integral and differential, and controls the opening degree of an automatic proportional regulation water cooling device (6) to reduce the temperature or controls the opening degree of a proportional opening steam heating device (7) to increase the temperature according to a calculation result so as to achieve the purpose of controlling the temperature;
2) and humidity control: the PLC (30) automatically adjusts the opening degree of the cold water device (6) for dehumidification or opens the opening degree of the steam humidifying device (8) for humidification in proportion after comparing a return air humidity signal detected by a return air humidity sensor (17) in a return air pipeline (19) with a humidity set value;
3) and controlling the wind speed: the PLC (30) compares the air supply speed signal detected by the air supply speed sensor (11) with a set air speed value and then automatically adjusts the output frequency of the air feeder (5) in proportion;
4) and monitoring the temperature, the humidity and the pressure difference of the room: the PLC (30) uploads signals of temperature, humidity and pressure of a workshop detected by the indoor temperature sensor (14), the indoor humidity sensor (15) and the indoor pressure sensor (16) to a computer for display/storage/recording;
5) when the disinfection is selected, the start and stop of an ozone generator of the ozone generating device (10) can be controlled according to the set disinfection time; when in disinfection, the fresh air valve (2) and the corresponding blower (5) are closed; when the set disinfection time is reached and the disinfection is finished, the working state is automatically recovered, and an ozone generator of the ozone generating device (10) is started, wherein the starting time can be set;
6) the protection of freezing prevention, when the temperature of the fresh air inlet detected by the air inlet temperature sensor (21) is lower than 10 ℃, the judgment is made in winter; in winter, the steam preheating valve of the preheating device (4) is kept 10% open when the machine is stopped.
9. The automated decontamination plant control method of claim 8, wherein:
the PLC (30) compares the set value of the room pressure difference with the pressure signal of the workshop:
if the pressure signal of the workshop does not meet the set pressure difference value, taking the temperature at the moment as the initial delay temperature, and entering a 15-second delay state;
if the pressure signal of the workshop does not meet the set pressure difference value all the time in the time delay state of 15 seconds, the PLC (30) adjusts the opening of the air supply valve (12) according to the initial time delay temperature and adjusts the pressure difference.
10. The automated decontamination plant control method of claim 9, wherein:
the working process of the refrigeration station water system comprises the following steps:
1) starting a first freezing pump (31) and a third freezing pump (33);
2) the chilled return water enters from the water inlet pipeline, passes through the first chilling pump (31), enters the heat release pipeline of the heat exchange device (35), and exchanges heat with the low-temperature cooling water in the heat absorption pipeline of the heat exchange device (35) to become normal-temperature cooling water;
3) and the normal temperature cooling water enters the cooling tower (36) for heat release after passing through the third refrigerating pump (33), becomes low temperature cooling water, enters a heat absorption pipeline of the heat exchange device (35), and exchanges heat with the cold return water in a heat release pipeline of the heat exchange device (35) to become refrigerating water supply.
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