CN115095963B - Self-adaptive fresh air system adjusting method and corresponding fresh air system - Google Patents
Self-adaptive fresh air system adjusting method and corresponding fresh air system Download PDFInfo
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- CN115095963B CN115095963B CN202211035200.1A CN202211035200A CN115095963B CN 115095963 B CN115095963 B CN 115095963B CN 202211035200 A CN202211035200 A CN 202211035200A CN 115095963 B CN115095963 B CN 115095963B
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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
- F24F11/62—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
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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
- F24F11/0001—Control or safety arrangements for ventilation
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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
- F24F11/74—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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F11/0001—Control or safety arrangements for ventilation
- F24F2011/0002—Control or safety arrangements for ventilation for admittance of outside air
- F24F2011/0005—Control or safety arrangements for ventilation for admittance of outside air to create underpressure in a room, keeping contamination inside
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
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- 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
Abstract
The invention discloses a self-adaptive adjustment method of a fresh air system and a corresponding fresh air system. According to the adjusting method, the control voltage of the air outlet fan is coarsely adjusted and finely adjusted, so that the precision and the adjusting speed of the pressure difference value are improved. And after the fan runs stably, the actually measured differential pressure value is recorded every second preset time, the adjustment is carried out again according to the difference value between the actually measured differential pressure value and the set differential pressure value, and meanwhile, the fan increases the air exhaust with the maximum control voltage, so that the negative pressure ward is ensured to be in a negative pressure state in real time, and respiratory tract transmission diseases are prevented from being transmitted through air circulation.
Description
Technical Field
The invention relates to a self-adaptive adjustment method of a fresh air system, and also relates to the fresh air system adopting the adjustment method, belonging to the technical field of air conditioning.
Background
In an epidemic situation stage, a plurality of shelter hospitals are required to install a fresh air system during construction so as to meet the requirement of fresh air and ensure an indoor negative pressure state. In the non-epidemic stage, in order to ensure the cleanness of indoor air and prevent untreated outdoor air from entering the indoor space, the indoor positive pressure state also needs to be ensured. In order to achieve the positive pressure or negative pressure effect, the traditional mode for adjusting the control voltage of the fresh air system is to step by 0.1V, increase the control voltage from 0V to 10V, and step by 100 times to reach the target pressure value, although the precision is high, the efficiency is low, and the indoor negative pressure state is difficult to be rapidly ensured.
In the Chinese invention application with the application number of 202010202678.3, a negative pressure ward combined with epidemic prevention is disclosed, which comprises a medical care corridor, a ward room, a patient corridor and a buffer room. The power distribution type ventilation system comprises a main fresh air fan, a fresh air control module, a main exhaust fan, an exhaust control module, a pressure difference sensor and an air quality sensor, wherein the pressure difference sensor is used for monitoring the pressure difference between a ward and a corresponding buffer room, and the air quality sensor is used for monitoring the air quality condition in the ward. When the negative pressure sickroom is used, the exhaust control module can be linked with the feedback signal of the pressure difference sensor to regulate the exhaust volume, and the designed pressure difference can be ensured to be restored to be normal immediately after being damaged so as to prevent cross infection; when using as ordinary ward, fresh air control module can combine the feedback signal linkage regulation fresh air volume of air quality sensor, and then linkage exhaust control module adjusts the volume of airing exhaust, can ensure to reduce the energy consumption when using as ordinary ward.
Disclosure of Invention
The invention provides a self-adaptive adjusting method (simply referred to as an adjusting method) for a fresh air system.
Another technical problem to be solved by the present invention is to provide a fresh air system using the above adjustment method.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to a first aspect of the embodiments of the present invention, there is provided a fresh air system adaptive adjustment method, for adjusting a positive pressure state, including the following steps:
s10: a control unit of the fresh air system receives an instruction of adjusting to be in a positive pressure state, obtains a set pressure difference value and enables the fan to continuously operate for a preset time length;
s11: the pressure difference sensor transmits the first actually measured pressure difference value to a control unit of the fresh air system in real time;
s12: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the first measured pressure difference value according to the set pressure difference value and the first measured pressure difference value in the step S11, and if the difference value obtained by subtracting the first measured pressure difference value from the set pressure difference value is less than or equal to a rough adjustment threshold value, the step S18 is carried out; if the difference value obtained by subtracting the first measured pressure difference value from the set pressure difference value is larger than the rough adjustment threshold value, turning to the step S13;
s13: the fresh air system controls the voltage of the exhaust fan, reduces a first step value every a first step time, and detects to obtain a second measured differential pressure value; if the voltage of the exhaust fan reaches the minimum value and the second measured differential pressure value does not reach the set differential pressure value, the step S18 is carried out; if the voltage of the exhaust fan does not reach the minimum value, the step S14 is carried out;
s14: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the second measured pressure difference value according to the second measured pressure difference value in the step S13, and if the difference value between the set pressure difference value and the second measured pressure difference value is less than or equal to the fine adjustment threshold value, the step S18 is switched to; if the set differential pressure value is larger than the second measured differential pressure value and the difference value between the set differential pressure value and the second measured differential pressure value is larger than the fine adjustment threshold value, turning to the step S13; if the set differential pressure value is smaller than the second measured differential pressure value for at least one time, turning to the step S15;
s15: the fresh air system controls the voltage of the exhaust fan, a second stepping value is added every second stepping time, and a second measured differential pressure value is obtained through detection;
s16: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the second measured pressure difference value according to the second measured pressure difference value in the step S15, and if the difference value obtained by subtracting the second measured pressure difference value from the set pressure difference value is less than or equal to a fine adjustment threshold value, the step S18 is carried out; if the set differential pressure value is larger than the second measured differential pressure value for at least one time, turning to the step S17; if the set differential pressure value is smaller than the second measured differential pressure value, the step S15 is carried out;
s17: the fresh air system controls the voltage of the exhaust fan, reduces the third step value every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S18;
s18: the fan stably operates at the control voltage;
s19: the control unit of the fresh air system records the actually measured differential pressure value in the step S18 once every fourth stepping time length, records the preset times, and if all the data recorded in the preset times exceed the range of the actually measured differential pressure value, the step S20 is carried out; otherwise, go to step S18;
s20: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the fourth measured pressure difference value according to the fourth measured pressure difference value in the step S19, and if the difference value between the set pressure difference value and the fourth measured pressure difference value is less than or equal to a readjustment threshold value, the step S17 is switched to; and if the difference value between the set differential pressure value and the fourth measured differential pressure value is larger than the readjusting threshold value, the step is switched to the step S13.
Preferably, the first step value, the second step value and the third step value satisfy first step value > second step value > third step value.
Preferably, the first step value is 2.0V, the second step value is 0.5V, and the third step value is 0.2V.
Preferably, the first preset time period, the first stepping time period, the second stepping time period, the third stepping time period and the fourth stepping time period are 30s.
Preferably, the coarse adjustment threshold, the fine adjustment threshold and the fine adjustment threshold are 1Pa, and the readjustment threshold is 2Pa.
According to a second aspect of the embodiments of the present invention, there is provided a fresh air system adaptive adjustment method for adjusting a negative pressure state, including the following steps:
s30: a control unit of the fresh air system receives an instruction of adjusting the fresh air system to be in a negative pressure state, obtains a set pressure difference value and enables the fan to continuously run for a first preset time length;
s31: the pressure difference sensor transmits the first actually-measured pressure difference value P1 to a control unit of the fresh air system in real time;
s32: the control unit of the fresh air system calculates the difference value between the first measured pressure difference value P1 and the set pressure difference value P0 according to the set pressure difference value and the first measured pressure difference value P1 in the step S31, and if the difference value obtained by subtracting the set pressure difference value P0 from the first measured pressure difference value P1 is less than or equal to the rough adjustment threshold value, the step S38 is switched to; if the difference value obtained by subtracting the set differential pressure value P0 from the first measured differential pressure value P1 is larger than the rough adjustment threshold value, the step S33 is switched to;
s33: the fresh air system controls the voltage of the exhaust fan, a first step value V1 is added every first step time, and a second actually-measured differential pressure value P2 is obtained through detection; if the voltage of the exhaust fan reaches the maximum value and the second measured differential pressure value P2 does not reach the set differential pressure value P0, the step S34 is carried out; if the voltage of the exhaust fan does not reach the maximum value, the step S34 is carried out;
s34: the control unit of the fresh air system calculates a difference value between the second measured pressure difference value P2 and the set pressure difference value P0 according to the second measured pressure difference value P2 in step S33, and if the difference value between the second measured pressure difference value P2 and the set pressure difference value P0 is less than or equal to the fine adjustment threshold value, the process goes to step S38; if the second measured differential pressure value P2 is greater than the set differential pressure value and the difference between the two is greater than the fine adjustment threshold value, go to step S33; if the second measured differential pressure value P2 is smaller than the set differential pressure value for at least one time, turning to the step S35;
s35: the fresh air system controls the voltage of the exhaust fan, reduces a second step value V2 every second step duration, and detects to obtain a second actually measured differential pressure value P3;
s36: the control unit of the fresh air system calculates a difference value between the second measured pressure difference value P3 and the set pressure difference value P0 according to the second measured pressure difference value P3 in the step S35, and if the difference value between the second measured pressure difference value P3 and the set pressure difference value P0 is less than or equal to a fine adjustment threshold value, the step S38 is performed; if the second measured differential pressure value P3 is larger than the set differential pressure value for at least one time, turning to the step S37; if the second measured differential pressure value P3 is smaller than the set differential pressure value, go to step S35;
s37: the fresh air system controls the voltage of the exhaust fan, increases a third step value V3 every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S38;
s38: the fan stably operates at the control voltage;
s39: the control unit of the fresh air system records a fourth actually measured pressure difference value P4 in the step S38 every fourth stepping time length, and if the absolute value of the difference value between the fourth actually measured pressure difference value P4 and the set predicted value is smaller than the adjustment threshold value, the step S400 is switched to; if the difference value between the fourth measured differential pressure value P4 and the set predicted value is greater than the adjustment threshold value, the step goes to the step S38;
s40: a control unit of the fresh air system starts a fan to operate for a second preset time at the maximum control voltage;
s41: the control unit of the fresh air system calculates a difference value between the fourth actual measured pressure difference value P4 and the set pressure difference value P0 according to the fourth actual measured pressure difference value P4 in the step S40, and if the difference value between the fourth actual measured pressure difference value P4 and the set pressure difference value P0 is larger than the readjusting threshold value, the step S35 is performed; if the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 is less than or equal to the readjusting threshold value, the process goes to step S38.
Preferably, the coarse tuning threshold, the fine tuning threshold and the readjusting threshold are all 1Pa.
According to a third aspect of the embodiments of the present invention, a fresh air system is provided, wherein the indoor and outdoor pressure difference is adjusted by using the above fresh air system adaptive adjustment method.
Compared with the prior art, the fresh air system self-adaptive adjusting method and the corresponding fresh air system provided by the invention have the advantages that coarse adjustment and fine adjustment are carried out on the control voltage of the fan at the air outlet, so that the precision of adjusting the differential pressure value and the adjusting speed are improved. And, after the fan steady operation, through the measured differential pressure value of every second preset time record once, adjust once more according to this measured differential pressure value and the difference of setting for the differential pressure value to the fan increases to exhaust with maximum control voltage, makes can guarantee that the ward is in the negative pressure state in real time during the epidemic situation, prevents that the epidemic situation from passing through the circulation of air and spreading.
Drawings
FIG. 1 is a flowchart of a method for receiving an instruction for adjusting indoor and outdoor pressure differences from a control unit of a fresh air system according to an embodiment of the present invention;
FIG. 2 is a first flowchart of a method for adjusting a positive pressure state in a self-adaptive adjustment method of a fresh air system according to an embodiment of the present invention;
FIG. 3 is a flowchart of a second method for adjusting a positive pressure state in a self-adaptive adjustment method of a fresh air system according to an embodiment of the present invention;
FIG. 4 is a first flowchart of a method for adjusting a negative pressure state in a self-adaptive adjustment method of a fresh air system according to an embodiment of the present invention;
fig. 5 is a flowchart of a second method for adjusting a negative pressure state in a self-adaptive adjusting method of a fresh air system according to an embodiment of the present invention.
Detailed Description
The technical contents of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the fresh air system adaptive adjustment method provided by the embodiment of the present invention includes a method for adjusting a positive pressure state and a method for adjusting a negative pressure state. A control unit of the fresh air system receives an instruction for adjusting the indoor and outdoor pressure difference, and if the control unit judges that the indoor and outdoor pressure difference is in the positive pressure adjusting state, the control unit turns to a method A for adjusting the positive pressure state; if it is determined that the positive pressure state is not to be adjusted, the routine proceeds to method B, in which the negative pressure state is adjusted.
As shown in fig. 2 to 3, the method for adjusting a positive pressure state in an embodiment of the present invention at least includes the following steps:
s10: the control unit of the fresh air system receives an instruction of adjusting to a positive pressure state, obtains a set differential pressure value, and enables the fan to continuously operate for a first preset time length.
The set differential pressure value may be a differential pressure value set by a user or a system default differential pressure value. In this embodiment, the control unit of the fresh air system starts the fourth gear of the fan to operate for 30s. The starting gear and the running time can be arbitrarily selected according to actual conditions. Before the fan is started, the indoor and outdoor pressure is balanced, and the pressure difference is zero just before the speed regulation. In one embodiment of the present invention, the fourth gear is selected to mean an intermediate control voltage of 5V between the fan control voltages of 0-10V, such that the adjustment intervals are close whether the control voltage of the positive pressure decreasing fan is adjusted or the control voltage of the negative pressure increasing fan is adjusted.
S11: the pressure difference sensor transmits the first actually measured pressure difference value P1 to a control unit of the fresh air system in real time.
The pressure difference sensor is connected to an air exhaust module of a fresh air system, and detects the pressure difference of indoor and outdoor air pressure of the fresh air fan in real time.
S12: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the first measured pressure difference value P1 according to the set pressure difference value and the first measured pressure difference value P1 in the step S11, and if the difference value obtained by subtracting the first measured pressure difference value P1 from the set pressure difference value is less than or equal to a rough adjustment threshold value, the step S18 is carried out; if the difference value obtained by subtracting the first measured pressure difference value P1 from the set pressure difference value is greater than the rough adjustment threshold value, the process goes to step S13.
The coarse tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the coarse threshold is 1Pa.
S13: the fresh air system controls the voltage of the exhaust fan, reduces a first step value V1 every first step time, and detects to obtain a second actually-measured differential pressure value P2; if the voltage of the exhaust fan reaches the minimum value and the second measured differential pressure value P2 does not reach the set differential pressure value, the step S18 is carried out; if the voltage of the exhaust fan does not reach the minimum value, the process proceeds to step S14.
In step S13, the voltage of the air outlet is reduced to reduce the air outlet volume, so as to increase the indoor and outdoor differential pressure value, i.e., increase the second measured differential pressure value P2, and reduce the difference between the set differential pressure value and the second measured differential pressure value P2. In this step, the first step length and the first step value V1 may be set in advance according to actual demands. In one embodiment of the invention, the first step length is 30s and the first step value V1 is 2.0V.
S14: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the second measured pressure difference value P2 according to the second measured pressure difference value P2 in the step S13, and if the difference value between the set pressure difference value and the second measured pressure difference value P2 is smaller than or equal to the fine adjustment threshold value, the step S18 is switched to; if the set differential pressure value is larger than the second measured differential pressure value P2 and the difference value between the set differential pressure value and the second measured differential pressure value is larger than the fine adjustment threshold value, turning to the step S13; if the set differential pressure value is smaller than the second measured differential pressure value P2 at least once, the process goes to step S15.
The fine adjustment threshold value can be selected according to actual requirements. In one embodiment of the invention, the fine threshold is 1Pa. If so, the set differential pressure value is less than the second measured differential pressure value P2, which indicates that the second measured differential pressure value is very close to the set differential pressure value, and therefore a fine tuning step is required.
S15: and the fresh air system controls the voltage of the exhaust fan, a second stepping value V2 is added every second stepping time, and a second measured differential pressure value P3 is obtained through detection. Wherein the second step value V2 is smaller than the first step value V1 in step S13.
When the set differential pressure value is smaller than the second measured differential pressure value P2, a negative pressure state easily occurs, and therefore the second measured differential pressure value P2 needs to be reduced, so that the positive pressure state can be ensured only when the set differential pressure value is larger than the second measured differential pressure value P2. At this moment, the air exhaust volume of the fresh air system needs to be increased, and the indoor and outdoor differential pressure value is reduced, so that the set differential pressure value is larger than the second actually-measured differential pressure value P3.
By means of the technical measures, in the step S15, the voltage of the air outlet is increased, so that the air exhaust amount of the fresh air system is increased, the indoor and outdoor differential pressure value is reduced, namely the second actual measurement differential pressure value P3 is reduced, and the set differential pressure value is larger than the second actual measurement differential pressure value P3.
In this step, the second stepping length and the second preset value may be preset according to actual requirements. In one embodiment of the present invention, the second stepping time period is 30s, and the second preset value is 0.5V.
S16: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the second measured pressure difference value P3 according to the second measured pressure difference value P3 in the step S15, and if the difference value obtained by subtracting the second measured pressure difference value P3 from the set pressure difference value is less than or equal to a fine adjustment threshold value, the step S18 is switched to; if the set differential pressure value is larger than the second measured differential pressure value P3 for at least one time, the step S17 is executed; if the set differential pressure value is smaller than the second measured differential pressure value P3, the process goes to step S15.
The fine tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the threshold is 1Pa. If the set differential pressure value is larger than the second measured differential pressure value P3 at least once, it is indicated that the second measured differential pressure value P3 is very close to the set differential pressure value, so the adjustment mode needs to be changed.
S17: and the fresh air system controls the voltage of the exhaust fan, reduces the third step value V3 every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S18. Wherein the third step value V3 is smaller than the first step value V1 in step S13 and smaller than the second step value V2 in step S15.
In step S17, the voltage of the air outlet is decreased to decrease the air discharge amount, thereby increasing the indoor and outdoor differential pressure values. In this step, the third step duration and the third step value V3 may be set in advance according to actual requirements. In one embodiment of the invention, the third step duration is 30s and the third step value V3 is 0.2V.
S18: the fan stably operates at the control voltage.
S19: the control unit of the fresh air system records the actually measured differential pressure value in the step S18 once every fourth stepping time length, records the preset times, and if all the data recorded in the preset times exceed the range of the actually measured differential pressure value, the step S20 is carried out; otherwise, go to step S18.
It should be noted that the fourth stepping time length, the preset number of times and the range of the actually measured differential pressure value may be set according to actual requirements. In an embodiment of the present invention, the fourth step duration is 30s, the preset number of times is recorded as 5 times, and the measured differential pressure value ranges from-2 Pa to 2Pa.
S20: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the fourth measured pressure difference value P4 according to the fourth measured pressure difference value P4 in the step S19, and if the difference value between the set pressure difference value and the fourth measured pressure difference value P4 is smaller than or equal to the readjustment threshold value, the step S17 is switched to; if the difference between the set differential pressure value and the fourth measured differential pressure value P4 is greater than the readjustment threshold value, go to step S13.
The readjustment threshold value may be a value according to actual requirements. In one embodiment of the invention, the readjustment threshold is 2Pa. By setting the readjustment threshold and monitoring the working condition in the steady operation state based on the readjustment threshold, the actual operation state can be ensured to be within the range of the readjustment threshold. And once the actual operation state exceeds the readjusting threshold value, automatically jumping to S13 to realize the automatic adjustment of the pressure difference of the closed loop. Therefore, the fresh air system provided by the invention is ensured to always maintain a stable running state.
Therefore, in one embodiment of the invention, the step value (reduced value or increased value) of the control voltage of the fan at the air outlet is increased, so that the air discharge quantity of the air outlet can quickly reach the required air discharge quantity, the pressure difference value between the indoor and the outdoor can be quickly adjusted, the adjustment time of the pressure difference is shortened, and the purpose of saving energy is realized.
And the voltage of the air outlet fan is adjusted by adopting step values with different sizes in different stages, so that the precision of adjusting the differential pressure value is improved.
Specifically, the first step value V1 is used in step S13, the second step value V2 is used in step S15, and the third step value V3 is used in step S17. And the first step value V1, the second step value V2, and the third step value V3 satisfy the first step value V1 > the second step value V2 > the third step value V3. Rapidly approaching the set differential pressure value by using the first stepping value V1 until the set differential pressure value is smaller than the actually measured differential pressure value; then, the second stepping value V2 is used for quickly adjusting until the set differential pressure value is larger than the actually measured differential pressure value; and finally, slowly adjusting the positive value to the set differential pressure value by using the third stepping value V3.
It should be noted that, in the embodiment of the present invention, an adjustment manner of increasing after decreasing is adopted, so that the present invention is more suitable for actual application situations such as hospitals.
More specifically, a first step value V12.0V is used in step S13, a second step value V20.5V is used in step S15, and a third step value V30.2V is used in step S17.
As described above, in the embodiment of the present invention, the control voltage of the air outlet fan is coarsely and finely adjusted, so that the accuracy and the speed of adjusting the differential pressure value are improved. Because hundreds of wards of a hospital are in and out frequently, people often enter and exit the wards, the pressure difference of the wards is affected when the door is opened, and the pressure difference is automatically adjusted by a fresh air system. According to practical data, 1 hospital ward consumes about 200W (2 fresh air systems), so that 500 wards consumes about 100kW and 1000 wards consumes about 500kw. By adopting the self-adaptive adjusting method of the fresh air system, the adjusting time is shortened, and the energy consumption is saved.
As shown in fig. 4 to 5, the method for adjusting the negative pressure state in the embodiment of the present invention at least includes:
s30: the control unit of the fresh air system receives an instruction of adjusting the fresh air system to be in a negative pressure state, obtains a set pressure difference value, and enables the fan to continuously run for a first preset time length.
The set differential pressure value may be a user-set differential pressure value or a system default differential pressure value. In this embodiment, the control unit of the fresh air system starts the fourth gear of the fan to operate for 30s. The starting gear and the running time can be arbitrarily selected according to actual conditions.
S31: the pressure difference sensor transmits the first actually measured pressure difference value P1 to a control unit of the fresh air system in real time.
The pressure difference sensor is connected to an air exhaust module of a fresh air system, and detects the pressure difference of indoor and outdoor air pressure of the fresh air fan in real time.
S32: the control unit of the fresh air system calculates the difference value between the first measured pressure difference value P1 and the set pressure difference value P0 according to the set pressure difference value and the first measured pressure difference value P1 in the step S31, and if the difference value obtained by subtracting the set pressure difference value P0 from the first measured pressure difference value P1 is less than or equal to the rough adjustment threshold value, the step S38 is switched to; if the difference obtained by subtracting the set differential pressure value P0 from the first measured differential pressure value P1 is greater than the rough adjustment threshold value, the process goes to step S33.
The coarse tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the coarse threshold is 1Pa.
S33: the fresh air system controls the voltage of the exhaust fan, a first step value V1 is added every other first step time, and a second actually-measured differential pressure value P2 is obtained through detection; if the voltage of the exhaust fan reaches the maximum value and the second measured differential pressure value P2 does not reach the set differential pressure value P0, the step S34 is carried out; if the voltage of the exhaust fan does not reach the maximum value, the process proceeds to step S34.
In step S33, the voltage of the air outlet is increased to increase the air outlet volume, so as to reduce the indoor and outdoor differential pressure value, i.e. reduce the second measured differential pressure value P2, so that the difference between the second measured differential pressure value P2 and the set differential pressure value P0 is reduced. In this step, the first step length and the first step value V1 may be set in advance according to actual demands. In one embodiment of the invention, the first step length is 30s and the first step value V1 is 2.0V.
S34: the control unit of the fresh air system calculates a difference value between the second measured differential pressure value P2 and the set differential pressure value P0 according to the second measured differential pressure value P2 in step S33, and if the difference value between the second measured differential pressure value P2 and the set differential pressure value P0 is less than or equal to the fine adjustment threshold value, the process goes to step S38; if the second measured differential pressure value P2 is greater than the set differential pressure value and the difference between the two is greater than the fine adjustment threshold value, go to step S33; if the second measured differential pressure value P2 is smaller than the set differential pressure value at least once, the process goes to step S35.
The fine adjustment threshold value can be selected according to actual requirements. In one embodiment of the invention, the fine threshold is 1Pa. If the second measured differential pressure value P2 is smaller than the set differential pressure value, this indicates that the second measured differential pressure value P2 is close to the set differential pressure value, so the fine tuning step needs to be performed.
S35: and the fresh air system controls the voltage of the exhaust fan, reduces a second step value V2 every second step time, and detects to obtain a second actually-measured differential pressure value P3. Wherein the second step value V2 is smaller than the first step value V1 in step S33.
When the second actual measurement differential pressure value P2 is smaller than the set differential pressure value, a positive pressure state easily occurs, and therefore the second actual measurement differential pressure value P2 needs to be increased, so that the negative pressure state can be ensured only when the second actual measurement differential pressure value P2 is larger than the set differential pressure value. At this moment, the air exhaust volume of the fresh air system needs to be reduced, and the indoor and outdoor differential pressure value is increased, so that the second actually-measured differential pressure value P3 is larger than the set differential pressure value.
By using the above technical measures, in step S35, the voltage of the air outlet is reduced, so that the air outlet volume of the fresh air system is reduced, and thereby the indoor and outdoor differential pressure value is increased, that is, the second measured differential pressure value P3 is increased, so that the second measured differential pressure value P3 is greater than the set differential pressure value.
In this step, the second stepping length and the second preset value may be preset according to actual requirements. In one embodiment of the present invention, the second step time is 30s, and the second preset value is 0.5V.
S36: the control unit of the fresh air system calculates a difference value between the second measured pressure difference value P3 and the set pressure difference value P0 according to the second measured pressure difference value P3 in the step S35, and if the difference value between the second measured pressure difference value P3 and the set pressure difference value P0 is less than or equal to a fine adjustment threshold value, the step S38 is performed; if the second measured differential pressure value P3 is larger than the set differential pressure value for at least one time, turning to the step S37; if the second measured differential pressure value P3 is smaller than the set differential pressure value, the process goes to step S35.
The fine tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the threshold is 1Pa. If the second measured differential pressure value P3 is greater than the set differential pressure value at least once, it indicates that the second measured differential pressure value P3 is very close to the set differential pressure value, and therefore, the adjustment mode needs to be changed.
S37: and the fresh air system controls the voltage of the exhaust fan, increases a third step value V3 every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S38. Wherein the third step value V3 is smaller than the first step value V1 in step S23 and smaller than the second step value V2 in step S35.
In step S37, the voltage of the air outlet is increased to increase the air outlet volume, thereby reducing the pressure difference between the indoor and outdoor. In this step, the third step duration and the third step value V3 may be set in advance according to actual requirements. In one embodiment of the invention, the third step duration is 30s and the third step value V3 is 0.2V.
S38: the fan stably operates at the control voltage.
S39: the control unit of the fresh air system records a fourth actually measured pressure difference value P4 in the step S38 every fourth stepping time length, and if the absolute value of the difference value between the fourth actually measured pressure difference value P4 and the set predicted value is smaller than the adjustment threshold value, the step S40 is switched to; if the difference between the fourth measured differential pressure value P4 and the set predicted value is greater than the adjustment threshold, the process goes to step S38.
It should be noted that the fourth step duration and the adjustment threshold may be set according to actual requirements. In one embodiment of the present invention, the fourth step duration is 30s, and the adjustment threshold is 2Pa.
S40: and the control unit of the fresh air system starts the fan to operate for a second preset time at the maximum control voltage.
The second preset time period can be preset according to actual requirements. In one embodiment of the present invention, the second preset time period is 30s. The fan operates at the maximum control voltage, so that the air exhaust amount is increased, and the indoor pressure is quickly reduced.
S41: the control unit of the fresh air system calculates a difference value between the fourth actual measured pressure difference value P4 and the set pressure difference value P0 according to the fourth actual measured pressure difference value P4 in the step S40, and if the difference value between the fourth actual measured pressure difference value P4 and the set pressure difference value P0 is larger than the readjusting threshold value, the step S35 is performed; if the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 is less than or equal to the readjusting threshold value, the process goes to step S38.
The readjustment threshold value may be a value according to actual requirements. In one embodiment of the invention, the readjustment threshold is 1Pa.
Therefore, in an embodiment of the present invention, the voltage of the exhaust fan is adjusted by using different step values at different stages, so as to improve the accuracy of adjusting the differential pressure value.
Specifically, the first step value V1 is used in step S33, the second step value V2 is used in step S35, and the third step value V3 is used in step S37. And the first step value V1, the second step value V2, and the third step value V3 satisfy the first step value V1 > the second step value V2 > the third step value V3. Rapidly approaching the set differential pressure value by using the first stepping value V1 until the actually measured differential pressure value is smaller than the set differential pressure value; then, the second stepping value V2 is used for quickly adjusting until the actually measured differential pressure value is larger than the set differential pressure value; and finally, slowly adjusting the positive value to the set differential pressure value by using the third stepping value V3.
It should be noted that, in the embodiment of the present invention, an adjustment manner of increasing after decreasing is adopted, so that the present invention is more suitable for actual application situations such as hospitals.
More specifically, the first step value V1 is taken as 2.0V in step S33, the second step value V2 is taken as 0.5V in step S35, and the third step value V3 is taken as 0.2V in step S37.
In one embodiment of the invention, the fan is a fan for exhausting air, so increasing the fan voltage causes the pressure difference to drop (in the case of positive pressure) or the pressure difference to rise (in the case of negative pressure). Here, the differential pressure value is a value obtained by subtracting the indoor air pressure from the outdoor air pressure, and is directly measured by the differential pressure sensor.
Compared with the prior art, the fresh air system self-adaptive adjusting method provided by the embodiment of the invention can enable the fresh air system to be rapidly and accurately adjusted to be in a positive pressure state at ordinary times, and meets the low energy consumption requirement of a general ward; when epidemic outbreak occurs, the negative pressure state can be quickly and accurately adjusted, and diseases are prevented from being transmitted through air. Specifically, in the embodiment of the invention, the precision and the adjusting speed of the pressure difference value are improved by performing rough adjustment and fine adjustment on the control voltage of the air outlet fan. And after the fan runs stably, the actually measured differential pressure value is recorded once every second preset time, the adjustment is performed again according to the difference value between the actually measured differential pressure value and the set differential pressure value, and the fan increases the exhaust air with the maximum control voltage, so that the ward is ensured to be in a negative pressure state in real time during the epidemic situation, and the epidemic situation is prevented from being spread through air circulation.
The self-adaptive fresh air system adjusting method and the corresponding fresh air system provided by the invention are explained in detail above. It will be apparent to those skilled in the art that any obvious modifications thereof can be made without departing from the spirit of the invention, which infringes the patent right of the invention and bears the corresponding legal responsibility.
Claims (9)
1. A self-adaptive adjusting method of a fresh air system is used for adjusting a positive pressure state and is characterized by comprising the following steps:
s10: a control unit of the fresh air system receives an instruction of adjusting to a positive pressure state, obtains a set pressure difference value and enables the fan to continuously operate for a preset time length;
s11: the pressure difference sensor transmits the first actually measured pressure difference value to a control unit of the fresh air system in real time;
s12: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the first measured pressure difference value according to the set pressure difference value and the first measured pressure difference value in the step S11, and if the difference value obtained by subtracting the first measured pressure difference value from the set pressure difference value is less than or equal to a rough adjustment threshold value, the step S18 is carried out; if the difference value obtained by subtracting the first actually-measured pressure difference value from the set pressure difference value is larger than the roughly-adjusted threshold value, the step S13 is switched to;
s13: the fresh air system controls the voltage of the exhaust fan, reduces a first step value every a first step time, and detects to obtain a second measured differential pressure value; if the voltage of the exhaust fan reaches the minimum value and the second measured differential pressure value does not reach the set differential pressure value, the step S18 is carried out; if the voltage of the exhaust fan does not reach the minimum value, the step S14 is carried out;
s14: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the second measured pressure difference value according to the second measured pressure difference value in the step S13, and if the difference value between the set pressure difference value and the second measured pressure difference value is less than or equal to the fine adjustment threshold value, the step S18 is switched to; if the set differential pressure value is larger than the second measured differential pressure value and the difference value between the set differential pressure value and the second measured differential pressure value is larger than the fine adjustment threshold value, turning to the step S13; if the set differential pressure value is smaller than the second measured differential pressure value for at least one time, the step S15 is executed;
s15: the fresh air system controls the voltage of the exhaust fan, a second stepping value is added every second stepping time, and a second measured differential pressure value is obtained through detection;
s16: the control unit of the fresh air system calculates a difference value between the set pressure difference value and the second measured pressure difference value according to the second measured pressure difference value in the step S15, and if the difference value obtained by subtracting the second measured pressure difference value from the set pressure difference value is less than or equal to a fine adjustment threshold value, the step S18 is carried out; if the set differential pressure value is larger than the second measured differential pressure value for at least one time, turning to the step S17; if the set differential pressure value is smaller than the second measured differential pressure value, the step S15 is carried out;
s17: the fresh air system controls the voltage of the exhaust fan, reduces the third step value every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S18;
s18: the fan stably operates under the control of voltage;
s19: the control unit of the fresh air system records the actually measured pressure difference value in the step S18 once every fourth stepping time length, records the preset times, and if all the data recorded in the preset times exceed the range of the actually measured pressure difference value, the step S20 is switched to; otherwise, go to step S18;
s20: the control unit of the fresh air system calculates the difference value between the set pressure difference value and the fourth measured pressure difference value according to the fourth measured pressure difference value in the step S19, and if the difference value between the set pressure difference value and the fourth measured pressure difference value is less than or equal to the readjustment threshold value, the step S17 is switched to; if the difference between the set differential pressure value and the fourth measured differential pressure value is greater than the readjusting threshold value, go to step S13,
wherein the first step value, the second step value, and the third step value satisfy a first step value > a second step value > a third step value.
2. The adaptive fresh air system adjusting method of claim 1, wherein:
the first step value is 2.0V, the second step value is 0.5V, and the third step value is 0.2V.
3. The adaptive fresh air system adjusting method of claim 1, wherein:
the first step duration, the second step duration, the third step duration, and the fourth step duration are 30s.
4. The adaptive fresh air system adjusting method according to claim 1, wherein:
the coarse adjustment threshold, the fine adjustment threshold and the fine adjustment threshold are 1Pa, and the readjustment threshold is 2Pa.
5. A self-adaptive adjusting method of a fresh air system is used for adjusting a negative pressure state and is characterized by comprising the following steps:
s30: a control unit of the fresh air system receives an instruction of adjusting the fresh air system to be in a negative pressure state, obtains a set pressure difference value and enables the fan to continuously run for a first preset time length;
s31: the pressure difference sensor transmits the first actually measured pressure difference value to a control unit of the fresh air system in real time;
s32: the control unit of the fresh air system calculates the difference value between the first measured pressure difference value and the set pressure difference value according to the set pressure difference value and the first measured pressure difference value in the step S31, and if the difference value obtained by subtracting the set pressure difference value from the first measured pressure difference value is less than or equal to a rough adjustment threshold value, the step S38 is switched to; if the difference value obtained by subtracting the set pressure difference value from the first measured pressure difference value is larger than the rough adjustment threshold value, the step S33 is switched to;
s33: the fresh air system controls the voltage of the exhaust fan, increases a first step value every a first step time, and detects to obtain a second measured differential pressure value; if the voltage of the exhaust fan reaches the maximum value and the second measured differential pressure value does not reach the set differential pressure value, the step S34 is carried out; if the voltage of the exhaust fan does not reach the maximum value, the step S34 is carried out;
s34: the control unit of the fresh air system calculates the difference value between the second measured differential pressure value and the set differential pressure value according to the second measured differential pressure value in the step S33, and if the difference value between the second measured differential pressure value and the set differential pressure value is less than or equal to the fine adjustment threshold value, the step S38 is switched to; if the second measured differential pressure value is greater than the set differential pressure value and the difference value between the second measured differential pressure value and the set differential pressure value is greater than the fine adjustment threshold value, turning to the step S33; if the second measured differential pressure value is smaller than the set differential pressure value for at least one time, turning to the step S35;
s35: the fresh air system controls the voltage of the exhaust fan, reduces a second stepping value every second stepping time, and detects to obtain a second actually measured differential pressure value;
s36: the control unit of the fresh air system calculates the difference value between the second measured pressure difference value and the set pressure difference value according to the second measured pressure difference value in the step S35, and if the difference value obtained by subtracting the set pressure difference value from the second measured pressure difference value is less than or equal to the fine adjustment threshold value, the step S38 is switched to; if the second measured differential pressure value is larger than the set differential pressure value for at least one time, the step S37 is executed; if the second measured differential pressure value is smaller than the set differential pressure value, the step S35 is carried out;
s37: the fresh air system controls the voltage of the exhaust fan, increases a third step value every third step duration until the actually measured differential pressure value approaches the set differential pressure value, and then goes to the step S38;
s38: the fan stably operates under the control of voltage;
s39: the control unit of the fresh air system records the fourth actually measured pressure difference value in the step S38 once every fourth stepping time length, and if the absolute value of the difference value between the fourth actually measured pressure difference value and the set predicted value is smaller than the adjustment threshold value, the step S40 is switched to; if the difference value between the fourth measured differential pressure value and the set predicted value is larger than the adjustment threshold value, the step S38 is carried out;
s40: a control unit of the fresh air system starts a fan to operate for a second preset time at the maximum control voltage;
s41: the control unit of the fresh air system calculates the difference value between the fourth actual measurement pressure difference value and the set pressure difference value according to the fourth actual measurement pressure difference value in the step S40, and if the difference value between the fourth actual measurement pressure difference value and the set pressure difference value is larger than the readjustment threshold value, the step S35 is carried out; if the difference between the fourth measured differential pressure value and the set differential pressure value is less than or equal to the readjusting threshold value, go to step S38,
wherein the first step value, the second step value, and the third step value satisfy a first step value > a second step value > a third step value.
6. The adaptive fresh air system adjusting method of claim 5, wherein:
the first step value is 2.0V, the second step value is 0.5V, and the third step value is 0.2V.
7. The adaptive fresh air system adjusting method of claim 5, wherein:
the first step duration, the second step duration, the third step duration, and the fourth step duration are 30s.
8. The adaptive fresh air system adjusting method of claim 5, wherein:
the coarse tuning threshold, the fine tuning threshold, and the readjustment threshold are 1Pa.
9. A fresh air system is characterized in that the indoor and outdoor pressure difference is adjusted by adopting the fresh air system self-adaptive adjusting method of claim 1 or claim 5.
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| CN101802505A (en) * | 2007-08-17 | 2010-08-11 | 西门子工业公司 | Pressure control with coarse and fine adjustment |
| CN103375887A (en) * | 2012-04-18 | 2013-10-30 | 珠海格力电器股份有限公司 | Air conditioner, and control circuit and control method thereof |
| CN208750947U (en) * | 2018-07-19 | 2019-04-16 | 南京久诺科技有限公司 | A kind of high-precision volume adjusting apparatus |
| CN214164682U (en) * | 2020-12-15 | 2021-09-10 | 杭州广安汽车电器有限公司 | Negative pressure control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7275377B2 (en) * | 2004-08-11 | 2007-10-02 | Lawrence Kates | Method and apparatus for monitoring refrigerant-cycle systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101802505A (en) * | 2007-08-17 | 2010-08-11 | 西门子工业公司 | Pressure control with coarse and fine adjustment |
| CN103375887A (en) * | 2012-04-18 | 2013-10-30 | 珠海格力电器股份有限公司 | Air conditioner, and control circuit and control method thereof |
| CN208750947U (en) * | 2018-07-19 | 2019-04-16 | 南京久诺科技有限公司 | A kind of high-precision volume adjusting apparatus |
| CN214164682U (en) * | 2020-12-15 | 2021-09-10 | 杭州广安汽车电器有限公司 | Negative pressure control system |
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