CN115095963A - 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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- CN115095963A CN115095963A CN202211035200.1A CN202211035200A CN115095963A CN 115095963 A CN115095963 A CN 115095963A CN 202211035200 A CN202211035200 A CN 202211035200A CN 115095963 A CN115095963 A CN 115095963A
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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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- 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]
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Abstract
The invention discloses a self-adaptive fresh air system adjusting method 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 fresh air system adjusting method and a fresh air system adopting the adjusting method, belonging to the technical field of air conditioning.
Background
The hospital generally needs to install a fresh air system to meet the demand of fresh air and ensure the indoor negative pressure state of the negative pressure ward. For a general ward, in order to ensure clean indoor air and prevent untreated outdoor air from entering the room, an 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 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 for monitoring the pressure difference between a ward and a corresponding buffer room, and an air quality sensor for monitoring the air quality condition in the ward. When the negative pressure sickroom is used, the exhaust control module can be linked with a feedback signal of the differential pressure sensor to adjust the exhaust amount, and the designed differential pressure can be immediately restored to be normal 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 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 the rough adjustment threshold value, the control unit goes to the step S18; 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, the step of S13 is executed;
s13: the fresh air system controls the voltage of the exhaust fan, reduces the first step value every a first step time, and detects to obtain a second actually-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 process goes to a step S18; if the set differential pressure value is greater than the second measured differential pressure value and the difference between the set differential pressure value and the second measured differential pressure value is greater than the fine adjustment threshold value, the step S13 is executed; if the set differential pressure value is smaller than the second measured differential pressure value for at least one time, the step is switched to 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 the fine adjustment threshold value, the operation goes to the step S18; if the set differential pressure value is greater than the second measured differential pressure value 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, go to step S15;
s17: the fresh air system controls the voltage of the exhaust fan, reduces a third step value every third step duration until the actually measured differential pressure value is close to the set differential pressure value, and then turns 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 control unit goes to the step S20; 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 process goes to a step S17; if the difference between the set differential pressure value and the fourth measured differential pressure value is greater than the readjustment threshold value, the process goes to 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 30 s.
Preferably, the coarse adjustment threshold, the fine adjustment threshold and the fine adjustment threshold are 1Pa, and the readjustment threshold is 2 Pa.
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 carried out; 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, go to the step S33;
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 the difference 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 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, 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, 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 the difference 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 step S35, and if the difference between the second measured pressure difference value P3 and the set pressure difference value P0 is less than or equal to the fine adjustment threshold value, the step goes to step S38; if the second measured differential pressure value P3 is greater 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 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 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 between the fourth measured differential pressure value P4 and the set predicted value is greater than the adjustment threshold, go to 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 the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 according to the fourth measured differential pressure value P4 of step S40, and if the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 is greater than the readjustment threshold, the process goes to step S35; if the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 is equal to or less than the readjusting threshold value, the process goes to step S38.
Preferably, the coarse adjustment threshold, the fine adjustment threshold and the readjustment threshold are all 1 Pa.
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 rough 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 runs stably, the actual measurement pressure difference value is recorded every second preset time, adjustment is carried out again according to the difference value of the actual measurement pressure difference value and the set pressure difference value, the fan increases the air exhaust with the maximum control voltage, the negative pressure ward can be ensured to be in a negative pressure state in real time, and respiratory tract transmission diseases are prevented from being transmitted through air circulation.
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 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.
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 self-adaptive adjusting method provided in 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 30 s. 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 0V and 10V for the fan control voltage, such that the adjustment interval is very close regardless of whether the positive pressure is adjusted to decrease the fan control voltage or the negative pressure is adjusted to increase the fan control voltage.
S11: the pressure difference sensor transmits the first 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 the rough adjustment threshold value, the step S18 is carried out; if the difference of the set differential pressure value minus the first measured differential pressure value P1 is greater than the coarse adjustment threshold, proceed to step S13.
The coarse tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the coarse tuning threshold is 1 Pa.
S13: the fresh air system controls the voltage of the exhaust fan, reduces a first step value V1 every other 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 decreased to decrease the air outlet volume, so as to increase the pressure difference value between the indoor and outdoor, i.e. the second measured pressure difference value P2 is increased, so that the difference between the set pressure difference value and the second measured pressure difference value P2 is decreased. 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 present 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 between the set differential pressure value and the second measured differential pressure value P2 according to the second measured differential pressure value P2 in step S13, and if the difference between the set differential pressure value and the second measured differential pressure value P2 is less than or equal to the fine adjustment threshold value, the process goes to step S18; if the set differential pressure value is greater than the second measured differential pressure value P2 and the difference between the set differential pressure value and the second measured differential pressure value is greater 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 S15.
The fine adjustment threshold value can be selected according to actual requirements. In one embodiment of the invention, the fine threshold is 1 Pa. If so, the set differential pressure value is less than the second measured differential pressure value P2, indicating that the second measured differential pressure value is close to the set differential pressure value, and a fine tuning step is required.
S15: and the fresh air system controls the voltage of the exhaust fan, a second step value V2 is added every second step duration, and a second actually-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 is likely to occur, and therefore, the second measured differential pressure value P2 needs to be reduced so that the positive pressure state can be ensured only if the set differential pressure value is larger than the second measured differential pressure value P2. At this time, the exhaust air 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 greater than the second actually measured differential pressure value P3.
With the above technical measures, in step S15, the voltage of the air outlet is increased to increase the air outlet volume of the fresh air system, so as to reduce the indoor and outdoor differential pressure value, i.e. reduce the second measured differential pressure value P3, so that the set differential pressure value is greater than the second measured 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 step time is 30s, and the second preset value is 0.5V.
S16: the control unit of the fresh air system calculates the difference between the set pressure difference value and the second measured pressure difference value P3 according to the second measured pressure difference value P3 in step S15, and if the difference between the set pressure difference value and the second measured pressure difference value P3 is less than or equal to the fine adjustment threshold value, the process goes to step S18; if the set differential pressure value is greater than the second measured differential pressure value P3 at least once, go to step S17; if the set differential pressure value is smaller than the second measured differential pressure value P3, go to S15.
The fine tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the threshold is 1 Pa. If the set differential pressure value is greater than the second measured differential pressure value P3 at least once, it means that the second measured differential pressure value P3 is close to the set differential pressure value, and therefore, 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 is smaller than the second step value V2 in step S15.
In step S17, the voltage of the exhaust outlet is decreased to decrease the amount of exhaust air, thereby increasing the difference between the indoor and outdoor pressures. In this step, the third step duration and the third step value V3 may be set in advance according to actual demands. In one embodiment of the present 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 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, the process goes 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 2 Pa.
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 of 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 carried out; if the difference between the set differential pressure value and the fourth measured differential pressure value P4 is greater than the readjusting threshold value, go to step S13.
The readjustment threshold value may be set according to actual requirements. In one embodiment of the invention, the readjustment threshold is 2 Pa. By setting the readjustment threshold and monitoring the working condition in the stable running state based on the readjustment threshold, the actual running state can be ensured to be within the range of the readjustment threshold. Once the actual operating state exceeds the readjusting threshold, the process automatically jumps to S13 to realize the automatic adjustment of the pressure difference in 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 (the reduction value or the increase value) of the control voltage of the fan at the air outlet is increased, so that the air exhaust volume at the air outlet quickly reaches the required air exhaust volume, the pressure difference value between the indoor space and the outdoor space can be quickly adjusted, the adjustment time of the pressure difference is shortened, and the purpose of energy conservation is achieved.
In addition, the voltage of the air outlet fan is adjusted by adopting different stepping values in different stages, so that the precision of adjusting the differential pressure value is improved.
Specifically, the first step value V1 is adopted in step S13, the second step value V2 is adopted in step S15, and the third step value V3 is adopted 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 step value V1 until the set differential pressure value is smaller than the measured differential pressure value; then, the second stepping value V2 is used for fast adjusting until the set differential pressure value is larger than the actually measured differential pressure value; finally, the third step value V3 is used to slowly adjust the positive pressure value to the set pressure difference value.
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 V12.0V is adopted in step S13, the second step value V20.5V is adopted in step S15, and the third step value V30.2V is adopted 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 500 wards consumes about 100kW and 1000 wards consumes about 500 kW. 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: and the control unit of the fresh air system receives an instruction of adjusting the fresh air system to be in a negative pressure state, acquires a set differential pressure value and enables the fan to continuously operate for a first preset time.
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 30 s. The starting gear and the running time can be arbitrarily selected according to actual conditions.
S31: the pressure difference sensor transmits the first 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 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 step S31, and if the difference between the first measured pressure difference value P1 and the set pressure difference value P0 is less than or equal to a rough adjustment threshold value, the process goes to step S38; if the difference of the first measured differential pressure value P1 minus the set differential pressure value P0 is greater than the coarse adjustment threshold, go to step S33.
The coarse tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the coarse tuning threshold is 1 Pa.
S33: the fresh air system controls the voltage of the exhaust fan, increases a first step value V1 every other first step time, and detects to obtain a second actually measured differential pressure value P2; 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, entering the step S34; 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 amount of air exhausted, so as to reduce the pressure difference between the indoor and outdoor, i.e. the second measured pressure difference P2 is reduced, so that the difference between the second measured pressure difference P2 and the set pressure difference 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 present 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 the difference 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 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, 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, 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 1 Pa. If the second measured differential pressure value P2 is less than the set differential pressure value, this indicates that the second measured differential pressure value P2 is close to the set differential pressure value, and a fine tuning step is required.
S35: and 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. Wherein the second step value V2 is smaller than the first step value V1 in step S33.
When the second measured differential pressure value P2 is smaller than the set differential pressure value, a positive pressure state is likely to occur, and therefore, the second measured differential pressure value P2 needs to be increased, so that the negative pressure state can be ensured only when the second measured differential pressure value P2 is greater than the set differential pressure value. At this time, 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 measured differential pressure value P3 is greater than the set differential pressure value.
By using the above technical measures, in step S35, the voltage of the air outlet is reduced to reduce the air outlet volume of the fresh air system, so as to increase the indoor and outdoor pressure difference value, i.e. increase the second measured pressure difference value P3, so that the second measured pressure difference value P3 is greater than the set pressure difference 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 the difference 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 step S35, and if the difference between the second measured pressure difference value P3 and the set pressure difference value P0 is less than or equal to the fine adjustment threshold value, the step goes to step S38; if the second measured differential pressure value P3 is greater 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 S35.
The fine tuning threshold value can be selected according to actual requirements. In one embodiment of the invention, the threshold is 1 Pa. If the second measured differential pressure value P3 is greater than the set differential pressure value at least once, it means that the second measured differential pressure value P3 is 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 is smaller than the second step value V2 in step S35.
In step S37, the voltage of the exhaust outlet is increased to increase the exhaust amount, thereby reducing the difference between the indoor and outdoor pressures. In this step, the third step duration and the third step value V3 may be set in advance according to actual demands. In one embodiment of the present invention, the third step time period 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 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 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 between the fourth measured differential pressure value P4 and the set predicted value is greater than the adjustment threshold, go 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 invention, the fourth step duration is 30s and the adjustment threshold is 2 Pa.
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 duration can be preset according to actual requirements. In one embodiment of the present invention, the second preset time period is 30 s. The fan operates at the maximum control voltage, so that the air exhaust amount is increased, and the indoor pressure is rapidly reduced.
S41: the control unit of the fresh air system calculates the difference between the fourth measured pressure difference value P4 and the set pressure difference value P0 according to the fourth measured pressure difference value P4 of step S40, and if the difference between the fourth measured pressure difference value P4 and the set pressure difference value P0 is greater than the readjustment threshold, the process goes to step S35; if the difference between the fourth measured differential pressure value P4 and the set differential pressure value P0 is equal to or less than 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 1 Pa.
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 adopted in step S33, the second step value V2 is adopted in step S35, and the third step value V3 is adopted 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 step value V1 until the measured differential pressure value is smaller than the set differential pressure value; then, the second step value V2 is used for quickly adjusting until the actually measured differential pressure value is larger than the set differential pressure value; finally, the third step value V3 is used to slowly adjust the positive pressure value to the set pressure value.
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 2.0V in step S33, the second step value V2 is 0.5V in step S35, and the third step value V3 is 0.2V in step S37.
In one embodiment of the invention, the fan is a fan for exhausting air, so increasing the fan voltage will cause 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 self-adaptive adjustment method of the fresh air system 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 common ward; if necessary, 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 every second preset time, the adjustment is carried out again according to the difference value of 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 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.
The self-adaptive adjusting method of the fresh air system 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 (11)
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 actual measurement pressure difference value according to the set pressure difference value and the first actual measurement pressure difference value in the step S11, and if the difference value obtained by subtracting the first actual measurement pressure difference value from the set pressure difference value is less than or equal to a rough adjustment threshold value, the control unit goes to the step S18; 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, the step is switched to the step S13;
s13: the fresh air system controls the voltage of the exhaust fan, reduces the first step value every a first step time, and detects to obtain a second actually-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 process goes to a step S18; if the set differential pressure value is greater than the second measured differential pressure value and the difference between the set differential pressure value and the second measured differential pressure value is greater than the fine adjustment threshold value, the step S13 is executed; if the set differential pressure value is smaller than the second measured differential pressure value for at least one time, the step of 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 the fine adjustment threshold value, the process goes to the step S18; if the set differential pressure value is larger than the second measured differential pressure value for at least one time, the step is switched to the step S17; if the set differential pressure value is smaller than the second measured differential pressure value, go to step S15;
s17: the fresh air system controls the voltage of the exhaust fan, reduces a third step value every third step duration until the actually measured differential pressure value is close to the set differential pressure value, and then turns 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 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 control unit goes to the step S20; 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 process goes to a step S17; if the difference between the set differential pressure value and the fourth measured differential pressure value is greater than the readjustment threshold value, the process goes to step S13.
2. The adaptive fresh air system adjusting method of claim 1, 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.
3. The adaptive fresh air system adjusting method of claim 2, wherein:
the first step value is 2.0V, the second step value is 0.5V, and the third step value is 0.2V.
4. The adaptive fresh air system adjusting method according to claim 1, wherein:
the first, second, third, and fourth step durations are 30 s.
5. The adaptive fresh air system adjusting method of claim 1, wherein:
the coarse adjustment threshold, the fine adjustment threshold and the fine adjustment threshold are 1Pa, and the readjustment threshold is 2 Pa.
6. 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 the rough adjustment threshold value, the control unit goes to the step S38; 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 is switched to the step S33;
s33: the fresh air system controls the voltage of the exhaust fan, increases a first step value every other first step time, and detects to obtain a second actually-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 a 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 control unit goes to the step S38; if the second measured differential pressure value is greater than the set differential pressure value and the difference between the second measured differential pressure value and the set differential pressure value is greater than the fine adjustment threshold value, the step S33 is executed; 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 a 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 control unit goes to the step S38; if the second measured differential pressure value is greater than the set differential pressure value for at least one time, turning to step S37; if the second measured differential pressure value 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 every third step duration until the actually measured differential pressure value is close to the set differential pressure value, and then turns 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 measured pressure difference value in the step S38 every fourth stepping time length, and if the absolute value of the difference value between the fourth measured pressure difference value and the set predicted value is smaller than the adjustment threshold value, the step S400 is switched to; if the difference between the fourth measured differential pressure value and the set predicted value is greater than the adjustment threshold, go to 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 measured pressure difference value and the set pressure difference value according to the fourth measured pressure difference value in the step S40, and if the difference value between the fourth measured pressure difference value and the set pressure difference value is larger than the readjustment threshold value, the step S35 is switched to; 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, the process goes to step S38.
7. The adaptive fresh air system adjusting method of claim 6, 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.
8. The adaptive fresh air system adjusting method according to claim 7, wherein:
the first step value is 2.0V, the second step value is 0.5V, and the third step value is 0.2V.
9. The adaptive fresh air system adjusting method of claim 6, wherein:
the first step duration, the second step duration, the third step duration, and the fourth step duration are 30 s.
10. The adaptive fresh air system adjusting method of claim 6, wherein:
the coarse tuning threshold, the fine tuning threshold, and the readjustment threshold are 1 Pa.
11. 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 6.
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| US20060032245A1 (en) * | 2004-08-11 | 2006-02-16 | Lawrence Kates | Method and apparatus for monitoring refrigerant-cycle systems |
| CN101802505A (en) * | 2007-08-17 | 2010-08-11 | 西门子工业公司 | Pressure control with coarse and fine adjustment |
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