CN115122879A - Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport - Google Patents
Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport Download PDFInfo
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- CN115122879A CN115122879A CN202210640767.5A CN202210640767A CN115122879A CN 115122879 A CN115122879 A CN 115122879A CN 202210640767 A CN202210640767 A CN 202210640767A CN 115122879 A CN115122879 A CN 115122879A
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- pressure
- positive pressure
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001914 filtration Methods 0.000 claims description 6
- 230000000249 desinfective effect Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000009530 blood pressure measurement Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 12
- 238000000746 purification Methods 0.000 description 11
- 238000004659 sterilization and disinfection Methods 0.000 description 10
- 238000004140 cleaning Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
- B60H3/06—Filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/0065—Control members, e.g. levers or knobs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/24—Devices purely for ventilating or where the heating or cooling is irrelevant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H3/00—Other air-treating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/32—Ground or aircraft-carrier-deck installations for handling freight
- B64F1/326—Supply vehicles specially adapted for transporting catering to and loading into the aircraft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Ventilation (AREA)
Abstract
The invention relates to a micro-positive pressure control method for keeping a cabin of an airport food transport vehicle constant in pressure, which solves the technical problem that air in the cabin of the existing airport food transport vehicle is easily polluted by outside air. The invention makes the outside air enter from the air inlet of the cabin body and discharge from the air outlet of the cabin body through the fan, and purifies and sterilizes the air entering the cabin body, detects the pressure difference inside and outside the cabin body, and controls the rotating speed of the fan according to the pressure difference inside and outside the cabin body, so that the pressure inside the cabin body is always larger than the pressure outside the cabin body. The invention is widely applied to the operation process of the airport food transport vehicle.
Description
Technical Field
The invention relates to the technical field of airport service vehicles, in particular to a micro-positive pressure control method for keeping a cabin of an airport food transport vehicle constant in pressure.
Background
Refer to the chinese utility model patent that the grant bulletin number is CN215621628U, the name is "a railway carriage or compartment body extension formula food guarantee car with cold-stored, the freezer", at present, the cabin body of general airport food transport vechicle uses the mode that does not have the new trend inner loop, adopt ordinary natural air inlet mode, do not do purification treatment to the air that gets into the under-deck, after closing the cabin door, under-deck atmospheric pressure equals the atmospheric pressure outside the cabin, when the vehicle operation, the air outside the transport way can freely get into the under-deck from the seam of the cabin body, easily cause the pollution.
Disclosure of Invention
The invention aims to solve the technical problem that the air in the cabin body of the conventional airport food transport vehicle is easily polluted by the outside air, and provides a micro-positive pressure control method for keeping the cabin body of the airport food transport vehicle constant in pressure, which can prevent the air in the cabin body of the food transport vehicle from being polluted by the outside air and improve the air quality in the cabin body.
The invention provides a micro positive pressure control method for keeping constant pressure of a cabin body of an airport food transport vehicle,
the airport food transport vehicle is provided with a cabin body, wherein a differential pressure sensor, a positive pressure fan, an air filtering device and a disinfection and purification device are connected in the cabin body;
the cabin body is connected with a control box, and the control box is provided with a touch screen, a controller and a positive pressure start/stop selection switch;
the micro-positive pressure control method comprises the following steps:
the user operates the positive pressure start/stop selector switch to the "start" position;
the differential pressure sensor transmits a differential pressure measured value P1 to the controller;
setting a reference value M;
the compensation value P is calculated according to the following formula:
P＝CV 2 ρ/2
in the above formula, C represents a wind pressure coefficient; v represents the speed of the airport food transport vehicle; ρ represents an air density;
determining a micro positive pressure given value P3, P3 being M + P of the system;
in the initial stage of micro-positive pressure starting, the positive pressure fan is firstly operated at full speed for a period of time, the single-phase valve at the one-way air outlet is in an open state, the original air in the cabin body is discharged, and initial air exchange is carried out;
after ventilation is finished, the controller starts the incremental digital PID to adjust the rotating speed of the positive pressure fan according to the deviation between the micro-positive pressure set value P3 and the differential pressure measurement value P1, so that the internal and external differential pressure of the cabin body reaches P3, and the system enters a pressure maintaining stage.
Preferably, in the pressure maintaining stage, if the pressure difference measured value P1 is greater than the upper limit threshold set by the system, the controller decelerates the positive pressure fan until the positive pressure fan stops, and if the pressure difference measured value P1 is less than the lower limit threshold set by the system, the controller accelerates the positive pressure fan, increases the intake air volume, and increases the pressure in the cabin.
Preferably, the controller is a PLC controller.
Preferably, the reference value M is 10 or 15.
Preferably, C takes a value of 0.9; air density rho value of 1.2kg/m 3 。
The invention also provides a micro-positive pressure control method for keeping the cabin of the airport food transport vehicle at a constant pressure, which comprises the following steps:
and 3, controlling the rotating speed of the fan according to the pressure difference between the inside and the outside of the cabin body, so that the pressure in the cabin body is always greater than the pressure outside the cabin body.
The invention has the advantages of ensuring that the air pressure in the cabin body of the airport food transport vehicle is higher than the pressure outside the cabin body, preventing pollution of polluting gases such as tail gas and the like to transported goods in the cabin body and improving the food safety of the transport vehicle during transportation. The micro-positive pressure system is adopted, the strength of the cabin body does not need to be specially enhanced, and the cost is saved.
Further features and aspects of the present invention will become apparent from the following description of specific embodiments with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart of prior art airport food transport vehicle operation control;
FIG. 2 is a schematic illustration of the configuration of the airport food transport vehicle of the present invention;
FIG. 3 is a side view of the airport food transport vehicle of FIG. 2;
FIG. 4 is a layout view of the various components of the body of the airport food transport vehicle of the present invention;
FIG. 5 is a layout view of the various components of the body of the airport food transport vehicle of the present invention;
FIG. 6 is an electrical schematic of the present invention;
fig. 7 is a flowchart of the control process of the present invention.
The symbols in the drawings illustrate that:
100. a cabin body; 1. the system comprises a cabin door detection sensor, 2, an air inlet, 3, a control box, 4, a pressure difference sensor, 5, a one-way air outlet, 6, a positive pressure fan, 7, an air filtering device, 8, a disinfection and purification device, 9, a filter element blockage detection sensor, 10, a cabin door detection sensor and 11, a filter element blockage detection sensor.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments thereof with reference to the attached drawings.
Referring to fig. 2 to 5, a cabin 100 of a conventional airport food transport vehicle is provided with two doors, a front door and a rear door, respectively, a door detection sensor 1 is installed at the front door position, and a door detection sensor 10 is installed at the rear door position.
Referring to fig. 2-5, a cabin 100 of an existing conventional airport food transport vehicle is provided with a differential pressure sensor 4, an air inlet 2, a one-way air outlet 5, a one-way valve, a positive pressure fan 6, an air filtering device 7 and a disinfection and purification device 8, wherein the differential pressure sensor 4 is installed in the cabin 100, the bottom of the cabin 100 is provided with two one-way air outlets 5, and each one-way air outlet is provided with one-way valve (two one-way valves in total); set up air intake 2 on the upper portion of the cabin body 100, positive pressure positive blower 6, air filter 7, disinfection purification device 8 is installed respectively in the cabin body 100, air filter 7's entry is located air intake 2 departments, disinfection purification device 8's import and air filter 7's exit linkage, disinfection purification device 8's export and positive pressure positive blower 6's entry linkage, disinfection purification device 8 self structrual installation filter core blocks up detection sensor 9, filter core blocks up detection sensor 11 (two filter core block up detection sensor are arranged in detecting disinfection purification device 8 the filter core whether block up, if block up just need the renew cartridge more). The air filter 7 is commercially available. The disinfection and purification device 8 is commercially available.
The control box 3 installed on the cabin 100 is provided with a positive pressure start/stop selection switch S01, a touch screen a2, an alarm H1 and a controller a 1.
Referring to fig. 6, S01 is a positive pressure start/stop selection switch, B01 and B02 are cabin door detection sensors, B03 and B04 are filter element blockage detection sensors, B12 is a differential pressure sensor 4, a1 is a PLC controller, a2 is a touch screen, A3 is a motor controller of the positive pressure fan 6, and a4 is a disinfection and purification device 8. Y5 and Y6 represent two check valves. H1 is a malfunction warning device. The signal output end of the differential pressure sensor is electrically connected with the PLC, the signal output end of the cabin door detection sensor is electrically connected with the PLC, and the motor controller of the positive pressure fan is electrically connected with the PLC.
When the user operates the positive pressure start/stop selection switch S01 to the "stop" position, the micro positive pressure system is not involved in control, and the PLC controller and the touch screen a2 only collect and display the states of the sensors and do not perform control.
When the user operates the positive pressure start/stop selection switch S01 to the "start" position, the system enters the positive pressure start mode and the micro-positive pressure system performs real-time control when the conditions such as the cabin door being closed are met.
The differential pressure sensor B12 transmits the measured data to the PLC control to represent the difference between the current air pressure inside the cabin and the air pressure outside the cabin, and the difference between the internal pressure and the external pressure is converted into an electric signal as the differential pressure measured value P1 of the system. According to the requirement of the national standard of clean room design specification, the cleanliness can be kept when the pressure difference between the interior and the exterior of the food cabin is more than 10Pa, in the embodiment, 15Pa is specifically selected, that is, the reference value M is defined as 15 Pa. Considering the operation of the air conditioner in the cabin and the change of the wind speed and the pressure outside the cabin during driving, a compensation value P is calculated according to the following formula:
P＝CV 2 ρ/2
in the above formula, C represents a wind pressure coefficient, and 0.9 is taken on average; v represents the speed of the food transport vehicle in the airport, and the unit is m/s; rho represents the air density, and the room temperature is 1.2kg/m 3 . It should be noted that the specific value of the wind pressure coefficient C is determined according to the actual environment, and is not limited to 0.9; the specific value of the air density rho is determined according to the actual environment and is not limited to 1.2kg/m 3 。
Determining a micro-positive pressure set value P3 of the system, wherein the micro-positive pressure set value P3 is the sum of the reference value M and the compensation value P, namely: and (3) taking the deviation value of the micro-positive pressure set value P3 and the differential pressure measured value P1 as a control quantity for controlling the rotating speed of the positive pressure fan 6, and adjusting according to an incremental digital PID method to realize the air volume supplement of the fresh air and the maintenance of the micro-positive pressure.
In the initial stage of micro-positive pressure starting, the positive pressure fan 6 is enabled to run at full speed, the single-phase valve at the one-way exhaust outlet 5 is in an open state, introduction of fresh air is facilitated, original air in the cabin body is exhausted, and the initial ventilation and cleaning process is carried out. After the positive pressure fan 6 runs for a period of time (for example, 3 minutes) at full speed, the PLC controller closes the check valve to complete the cleaning ventilation flow.
After ventilation is finished, the PLC starts the incremental digital PID to adjust the rotating speed of the positive pressure fan 6 according to the deviation of the micro-positive pressure set value P3 and the differential pressure measurement value P1, so that the pressure in the cabin is always greater than the pressure outside the cabin and the differential pressure is more than 15Pa (namely the differential pressure is more than a reference value M), namely the differential pressure inside and outside the cabin reaches P3, filtered fresh air is ensured to flow in a single direction, the cabin is in a constant pressure state, and the air outside the cabin can not enter the cabin from seams and other gaps of the cabin at the moment, thereby avoiding pollution to the cabin.
And then the system control enters a pressure maintaining stage, in the pressure maintaining stage, if the pressure difference measured value P1 is greater than the upper limit threshold value set by the system, the PLC controller enables the positive pressure fan 6 to decelerate until the positive pressure fan stops, and if the pressure difference measured value P1 is less than the lower limit threshold value set by the system, the PLC controller enables the positive pressure fan 6 to run at an accelerated speed, the air intake is increased, and the pressure in the cabin is increased.
The reference value M may be determined according to actual conditions.
In addition, when the system automatically operates, the PLC A1 automatically detects the states of the sensors, if the system has faults of open circuit, short circuit, overpressure, underpressure, filter element blockage and the like, the system automatically gives out alarm signals, and an operator is prompted through an H1 fault alarm device to prevent accidents.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. All changes, equivalents, modifications and the like which come within the scope of the invention as defined by the appended claims are intended to be embraced therein.
Claims (6)
1. A micro-positive pressure control method for keeping a cabin body of an airport food transport vehicle constant in pressure is characterized by comprising the following steps:
the airport food transport vehicle is provided with a cabin body, wherein a differential pressure sensor, a positive pressure fan, an air filtering device and a disinfecting and purifying device are connected in the cabin body, the cabin body is provided with an air inlet and a one-way air outlet, the one-way air outlet is connected with a one-way valve, the inlet of the air filtering device is positioned at the air inlet, the inlet of the disinfecting and purifying device is connected with the outlet of the air filtering device, and the outlet of the disinfecting and purifying device is connected with the inlet of the positive pressure fan;
the cabin body is connected with a control box, and the control box is provided with a touch screen, a controller and a positive pressure start/stop selection switch;
the micro-positive pressure control method comprises the following steps:
the user operates the positive pressure start/stop selector switch to the "start" position;
the differential pressure sensor transmits a differential pressure measured value P1 to the controller;
setting a reference value M;
the compensation value P is calculated according to the following formula:
P＝CV 2 ρ/2
in the above formula, C represents a wind pressure coefficient; v represents the speed of the airport food transport vehicle; ρ represents an air density;
determining a micro positive pressure given value P3, P3 being M + P of the system;
in the initial stage of micro-positive pressure starting, a positive pressure fan is operated at full speed for a period of time, a single-phase valve at a one-way air outlet is in an open state, and the original air in the cabin body is discharged to perform initial air exchange;
after ventilation is finished, the controller starts the incremental digital PID to adjust the rotating speed of the positive pressure fan according to the deviation value of the micro-positive pressure set value P3 and the differential pressure measurement value P1, so that the internal and external differential pressure of the cabin body reaches P3, and the system enters a pressure maintaining stage.
2. The micro-positive pressure control method for maintaining a constant pressure at a cabin of an airport food transport vehicle of claim 1,
in the pressure maintaining stage, if the pressure difference measured value P1 is greater than the upper limit threshold value set by the system, the controller decelerates the positive pressure fan until the positive pressure fan stops, and if the pressure difference measured value P1 is less than the lower limit threshold value set by the system, the controller accelerates the positive pressure fan to operate, so that the air intake is increased, and the pressure in the cabin is increased.
3. The micro-positive pressure control method for maintaining a constant pressure of a cabin of an airport food transport vehicle as claimed in claim 1 or 2, wherein the controller is a PLC controller.
4. The micro-positive pressure control method for maintaining a constant pressure at a cabin of an airport food transport vehicle as claimed in claim 1 or 2, wherein the reference value M is 10 or 15.
5. The micro-positive pressure control method for maintaining a constant pressure at a cabin of an airport food transport vehicle of claim 1 or 2,
the value of C is 0.9; the air density rho takes on a value of 1.2kg/m 3 。
6. A micro-positive pressure control method for keeping a cabin of an airport food transport vehicle at a constant pressure is characterized by comprising the following steps:
step 1, enabling external air to enter from an air inlet of a cabin body and be discharged from an air outlet of the cabin body through a fan, and purifying and disinfecting the air entering the cabin body;
step 2, detecting the pressure difference between the inside and the outside of the cabin body;
and 3, controlling the rotating speed of the fan according to the pressure difference between the inside and the outside of the cabin body, so that the pressure in the cabin body is always greater than the pressure outside the cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640767.5A CN115122879A (en) | 2022-06-08 | 2022-06-08 | Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640767.5A CN115122879A (en) | 2022-06-08 | 2022-06-08 | Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport |
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| Publication Number | Publication Date |
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| CN115122879A true CN115122879A (en) | 2022-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210640767.5A Pending CN115122879A (en) | 2022-06-08 | 2022-06-08 | Micro-positive pressure control method for keeping constant pressure of cabin of food transport vehicle in airport |
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|---|---|---|---|---|
| JPH0490959A (en) * | 1990-08-06 | 1992-03-24 | Mitsubishi Heavy Ind Ltd | Rolling stock |
| JP2007263548A (en) * | 2006-03-03 | 2007-10-11 | Fusao Hashimoto | Ventilation system |
| CN102267411A (en) * | 2011-05-20 | 2011-12-07 | 广东康盈交通设备制造有限公司 | Chemical-defense and antigas communication command vehicle |
| CN205862197U (en) * | 2016-06-28 | 2017-01-04 | 山东新华医疗器械股份有限公司 | Isolator cabin inside and outside differential pressure regulator control system |
| CN107650763A (en) * | 2017-08-09 | 2018-02-02 | 上海凌耀船舶工程有限公司 | Vehicle driver's guard method in toxic and harmful gas environment |
| CN108105929A (en) * | 2017-12-01 | 2018-06-01 | 许继电气股份有限公司 | A kind of prefabricated cabin |
| CN110481409A (en) * | 2019-08-29 | 2019-11-22 | 济南良乔环保设备有限公司 | A kind of vehicle-mounted sterile compartment |
| CN112303858A (en) * | 2020-10-31 | 2021-02-02 | 山东驭康医疗科技有限公司 | Indoor micro-positive pressure control method |
| CN113899519A (en) * | 2021-12-13 | 2022-01-07 | 中国飞机强度研究所 | Indoor airplane test micro-pressure control system and control method |
| CN216035848U (en) * | 2021-08-14 | 2022-03-15 | 李祁 | Be used for green food transportation to store cabinet |
-
2022
- 2022-06-08 CN CN202210640767.5A patent/CN115122879A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0490959A (en) * | 1990-08-06 | 1992-03-24 | Mitsubishi Heavy Ind Ltd | Rolling stock |
| JP2007263548A (en) * | 2006-03-03 | 2007-10-11 | Fusao Hashimoto | Ventilation system |
| CN102267411A (en) * | 2011-05-20 | 2011-12-07 | 广东康盈交通设备制造有限公司 | Chemical-defense and antigas communication command vehicle |
| CN205862197U (en) * | 2016-06-28 | 2017-01-04 | 山东新华医疗器械股份有限公司 | Isolator cabin inside and outside differential pressure regulator control system |
| CN107650763A (en) * | 2017-08-09 | 2018-02-02 | 上海凌耀船舶工程有限公司 | Vehicle driver's guard method in toxic and harmful gas environment |
| CN108105929A (en) * | 2017-12-01 | 2018-06-01 | 许继电气股份有限公司 | A kind of prefabricated cabin |
| CN110481409A (en) * | 2019-08-29 | 2019-11-22 | 济南良乔环保设备有限公司 | A kind of vehicle-mounted sterile compartment |
| CN112303858A (en) * | 2020-10-31 | 2021-02-02 | 山东驭康医疗科技有限公司 | Indoor micro-positive pressure control method |
| CN216035848U (en) * | 2021-08-14 | 2022-03-15 | 李祁 | Be used for green food transportation to store cabinet |
| CN113899519A (en) * | 2021-12-13 | 2022-01-07 | 中国飞机强度研究所 | Indoor airplane test micro-pressure control system and control method |
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Application publication date: 20220930 |
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