CN113551848B - Device and method for testing leakage amount of oxygen mask for airplane - Google Patents
Device and method for testing leakage amount of oxygen mask for airplane Download PDFInfo
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- CN113551848B CN113551848B CN202110633789.4A CN202110633789A CN113551848B CN 113551848 B CN113551848 B CN 113551848B CN 202110633789 A CN202110633789 A CN 202110633789A CN 113551848 B CN113551848 B CN 113551848B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000001301 oxygen Substances 0.000 title claims abstract description 100
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 100
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 10
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims abstract description 319
- 238000001514 detection method Methods 0.000 claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000029058 respiratory gaseous exchange Effects 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 10
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000000241 respiratory effect Effects 0.000 claims description 2
- 230000003434 inspiratory effect Effects 0.000 claims 1
- 108010066057 cabin-1 Proteins 0.000 description 13
- 238000012544 monitoring process Methods 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/10—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for containers, e.g. radiators
- G01M3/103—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for containers, e.g. radiators for flexible or elastic containers
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/14—Respiratory apparatus for high-altitude aircraft
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- 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
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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Abstract
The invention discloses a device and a method for testing the leakage amount of an oxygen mask for an airplane, wherein the device comprises the following components: the device comprises a detection cabin, an oxygen mask, a n-pentane generator, an exhaust fan, a n-pentane concentration sensor B, a n-pentane concentration sensor A, a n-pentane filter, a flowmeter, a control unit and a mask sealing tool; the test chamber contains a test subject; the subject's face is fitted with an oxygen mask; a breathing cavity is formed between the inner surface of the oxygen mask and the face of the subject; the mask sealing tool is arranged on the oxygen mask and communicated with the outside of the detection cabin through a pipeline, and the pipeline is provided with an n-pentane concentration sensor A, an n-pentane filter and a flowmeter; the n-pentane generator is arranged in the detection cabin; the n-pentane concentration sensor B is communicated with the inner cavity of the detection cabin through a pipeline; the exhaust fan is arranged on the detection cabin; the invention can quantitatively measure the leakage amount of the oxygen mask.
Description
Technical Field
The invention belongs to the technical field of aviation, and particularly relates to a device and a method for testing leakage of an oxygen mask for an airplane.
Background
The oxygen mask of the airplane is arranged in the cockpit of the airplane, and can provide emergency oxygen supply for passengers and crew members in the cockpit in case of emergency, so that the oxygen mask is a necessary emergency life-saving device. When the aircraft flies at high altitude, once the pressurized cabin is damaged in an emergency, the pressure in the cabin is rapidly reduced, so that the oxygen partial pressure in passengers in the cabin is rapidly reduced, and oxygen deficiency even endangers life safety occurs. In order to maintain the safe oxygen partial pressure of passengers, oxygen is supplied to the passengers through oxygen masks in an emergency. The leakage of the oxygen mask directly influences the oxygen supply performance of the oxygen mask, and the leakage of the oxygen mask is not more than 100cc/min according to the American standard AS8025 passenger oxygen mask; excessive leakage can result in rapid leakage of oxygen within the mask, and may result in oxygen starvation of the passenger, and therefore testing the amount of leakage from the oxygen mask is particularly important.
At present, patents such as CN201320835056, namely an oxygen mask for preventing air leakage, and CN201520390115, namely an oxygen mask for enhancing type are used for researching the leakage problem of the oxygen mask from the design angle, but the leakage amount of the oxygen mask is not measured; CN202018002135614 patent "a leak detector for oxygen mask" and other patents, which do not relate to the problem of leakage between the oxygen mask and the face of the wearer, wherein the leakage is the key of the leakage of the oxygen mask, but the leakage of the oxygen mask is not quantitatively measured, have studied the airtightness of the assembly of the parts of the oxygen mask; CN102016000290940 & lt & gt A monitoring system for oxygen mask tightness & gt provides a real-time detection system for detecting oxygen mask tightness, and the research can give an alarm when leakage occurs in the use process of an oxygen mask, but the leakage amount of the oxygen mask cannot be quantitatively analyzed.
Disclosure of Invention
In view of this, the invention provides an aircraft oxygen mask leakage amount testing device and method, which can quantitatively measure the leakage amount of an oxygen mask.
The invention is realized by the following technical scheme:
an aircraft oxygen mask leak test apparatus comprising: the device comprises a detection cabin, an oxygen mask, a n-pentane generator, an exhaust fan, a n-pentane concentration sensor B, a n-pentane concentration sensor A, a n-pentane filter, a flowmeter, a control unit and a mask sealing tool;
a test subject to be tested is accommodated in the detection cabin; the subject's face is wearing an oxygen mask; a breathing cavity is formed between the inner surface of the oxygen mask and the face of the subject;
the oxygen mask is provided with three holes communicated with the breathing cavity, and the three holes are respectively: an inhalation hole, an exhalation hole and an oxygen supply hole;
the mask sealing tool is arranged on the oxygen mask, and is provided with three interfaces, namely an interface I, an interface II and an interface III; one end of the first interface is connected with an exhalation hole of the oxygen mask, and the other end of the first interface extends out of the detection cabin through an exhalation pipeline and is communicated with air outside the detection cabin; one end of the second connector is connected with an air suction hole of the oxygen mask, and the other end of the second connector extends out of the detection cabin through an air suction pipeline and is communicated with air outside the detection cabin; the air suction pipeline is respectively provided with an n-pentane filter and a flowmeter; the n-pentane filter is used for filtering n-pentane in the air outside the detection cabin; the flow meter is used for measuring the inspiration volume of the subject; one end of the third interface is connected with an oxygen supply hole of the oxygen mask, and the other end of the third interface is connected with a n-pentane concentration sensor A outside the detection chamber through a measurement pipeline and used for detecting the n-pentane concentration in the breathing cavity;
the n-pentane generator is placed in the detection cabin and used for providing n-pentane gas for the detection cabin;
the n-pentane concentration sensor B is communicated with the inner cavity of the detection cabin through a pipeline and is used for detecting the n-pentane concentration in the detection cabin;
the exhaust fan is arranged on the detection cabin and used for exhausting gas in the detection cabin;
the control unit is respectively and electrically connected with the n-pentane generator, the exhaust fan, the n-pentane concentration sensor B, the n-pentane concentration sensor A and the flowmeter; the control unit is used for controlling the rotating speeds of the n-pentane generator and the exhaust fan, and recording and displaying an n-pentane concentration value of the pentane concentration sensor A, an n-pentane concentration value of the n-pentane concentration sensor B and an air suction value of the flowmeter.
Further, still include mixing fan, mixing fan installs on the measuring chamber for with the gaseous misce bene in the measuring chamber.
Further, the control unit controls the air supply speed of the n-pentane generator and the exhaust speed of the exhaust fan according to the n-pentane concentration value of the n-pentane concentration sensor B, so that the n-pentane concentration value in the detection cabin detected by the n-pentane concentration sensor B is controlled within a set range.
Furthermore, the concentration value of the n-pentane in the detection chamber is set within the range of 150-200ppm.
Further, the control unit records and displays the average n-pentane concentration value of the n-pentane concentration sensor B in every 30s, the accumulated n-pentane concentration value of the n-pentane concentration sensor A in every 30s and the accumulated air suction value of the flow meter in every 30 s.
Further, the range of the flowmeter (10) is not lower than 50LPM.
Further, the range of the n-pentane concentration sensor A (8) is not lower than 50ppm.
Further, the measuring range of the n-pentane concentration sensor B (7) is not lower than 500ppm.
A method for testing the leakage amount of an oxygen mask for an airplane is based on the testing device and comprises the following specific steps:
measuring a concentration value of n-pentane in a respiratory cavity between an oxygen mask and a subject through an n-pentane concentration sensor A, and starting the next step when the concentration value of n-pentane is stabilized to be 0;
step two, the n-pentane generator is opened through the control unit, and the n-pentane concentration value C of the n-pentane concentration sensor B is obtained 0 Controlling the air supply speed of the n-pentane generator and the exhaust speed of the exhaust fan to enable the n-pentane concentration value C in the detection cabin detected by the n-pentane concentration sensor B 0 After the stability is within the set range, starting to test for l;
step three, the subject breathes normally in the detection chamber, and the average n-pentane concentration value C of the n-pentane concentration sensor B in each set time length L is recorded and displayed through the control unit 0i And the accumulated n-pentane concentration value C of the n-pentane concentration sensor A in each set time length L i And the accumulated inspiration value V of the flowmeter in each set time length L Inhale i (ii) a Wherein i = test duration L/set duration L, i =1,2,3, \8230;, n;
step four, after the test is finished, the control unit automatically calculates the mask leakage Ke, and the calculation formula is as follows:
further, the set time length L is 30s; the test duration l is at least 3min.
Has the advantages that:
(1) The method adopts two n-pentane concentration sensors to respectively measure the n-pentane concentration in the oxygen mask and the n-pentane concentration in the detection cabin, eliminates the interference of the n-pentane concentration in the external environment on the oxygen mask leakage amount test by monitoring the n-pentane concentration change in the detection cabin, further can quantitatively analyze the leakage amount of the oxygen mask, and has obvious reliability and accuracy.
(2) The control unit is respectively and electrically connected with the n-pentane generator, the exhaust fan, the n-pentane concentration sensor B, the n-pentane concentration sensor A and the flow meter, namely the control unit is adopted to control the whole set of testing device, and the device has the characteristics of high automation degree, high response speed and good repeatability.
(3) The mask sealing tool is provided with three interfaces to isolate the exhalation hole, the inhalation hole and the oxygen supply hole of the oxygen mask from each other, so that the accuracy of the test is ensured.
Drawings
FIG. 1 is a schematic view of a test apparatus according to the present invention;
FIG. 2 is a schematic structural view of a mask sealing tool;
the device comprises a detection cabin 1, an oxygen mask 2, a subject 3, a pentane generator 4, a mixed fan 5, an exhaust fan 6, a pentane concentration sensor B7, a pentane concentration sensor A8, a pentane filter 9, a flowmeter 10, a control unit 11, a mask sealing tool 12, a first interface 13, a second interface 14 and a third interface 15.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
the embodiment provides an aircraft oxygen mask leakage amount testing device, referring to fig. 1, including: the device comprises a detection cabin 1, an oxygen mask 2, a n-pentane generator 4, a mixing fan 5, an exhaust fan 6, a n-pentane concentration sensor B7, a n-pentane concentration sensor A8, a n-pentane filter 9, a flowmeter 10, a control unit 11 and a mask sealing tool 12;
the detection cabin 1 is a glass closed chamber, and a subject 3 to be tested is accommodated in the detection cabin 1; the face of the subject 3 is wearing an oxygen mask 2; a breathing cavity is formed between the inner surface of the oxygen mask 2 and the face of the subject 3;
the oxygen mask 2 is provided with three holes communicated with the breathing cavity, and the three holes are respectively: an inhalation hole, an exhalation hole and an oxygen supply hole; in the embodiment, the oxygen supply hole is provided with the air storage bag, and the air storage bag needs to be taken down when a leakage quantity test is carried out;
referring to fig. 2, the mask sealing tool 12 is installed on the oxygen mask 2, and three interfaces, namely an interface one 13, an interface two 14 and an interface three 15, are arranged on the mask sealing tool 12;
one end of the first interface 13 is connected with an exhalation hole of the oxygen mask 2, and the other end of the first interface extends out of the detection cabin 1 through an exhalation pipeline and is communicated with air outside the detection cabin 1, so that the air exhaled by a subject 3 wearing the oxygen mask 2 is exhausted outside the detection cabin 1;
one end of the second connector 14 is connected with an air suction hole of the oxygen mask 2, and the other end of the second connector extends out of the detection cabin 1 through an air suction pipeline and is communicated with air outside the detection cabin 1; the air suction pipeline is respectively provided with a pentane filter 9 and a flowmeter 10; the n-pentane filter 9 is used for filtering n-pentane in the air outside the detection cabin 1, so that the air inhaled by the subject 3 wearing the oxygen mask 2 is the air outside the detection cabin 1 without the n-pentane; the flow meter 10 is used for measuring the inspiration amount of the subject 3 and sending the inspiration amount value to the control unit 11 for displaying; the range of the flow meter 10 is not less than 50LPM;
one end of the third interface 15 is connected with an oxygen supply hole of the oxygen mask 2, and the other end of the third interface is connected with a n-pentane concentration sensor A8 positioned outside the detection chamber 1 through a measurement pipeline, and is used for detecting the n-pentane concentration in the breathing cavity and sending the n-pentane concentration value to the control unit 11 for display; the measuring range of the n-pentane concentration sensor A8 is not lower than 50ppm;
the three interfaces of the mask sealing tool 12 isolate the exhalation hole, the inhalation hole and the oxygen supply hole of the oxygen mask 2 from each other, so that the accuracy of the test is ensured;
the n-pentane generator 4 is arranged in the detection chamber 1 and used for providing 200ppm of n-pentane gas for the detection chamber 1;
the n-pentane concentration sensor B7 is communicated with the inner cavity of the detection chamber 1 through a pipeline, and is used for detecting the n-pentane concentration in the detection chamber 1 and sending the n-pentane concentration value to the control unit 11 for displaying; the range of the n-pentane concentration sensor B7 is not lower than 500ppm;
the mixing fan 5 and the exhaust fan 6 are both arranged on the detection chamber 1, and the mixing fan 5 is used for uniformly mixing the gas in the detection chamber 1, namely, uniformly mixing the air in the detection chamber 1 and the n-pentane gas; the exhaust fan 6 is used for exhausting gas in the detection chamber 1 so as to adjust the concentration of the n-pentane in the detection chamber 1;
the control unit 11 is electrically connected with the n-pentane generator 4, the exhaust fan 6, the n-pentane concentration sensor B7, the n-pentane concentration sensor A8 and the flowmeter 10 respectively; the control unit is used for recording and displaying the received n-pentane concentration value of the pentane concentration sensor A8, the n-pentane concentration value of the n-pentane concentration sensor B7 and the air suction quantity value of the flow meter 10, and is also used for controlling the air supply speed of the n-pentane generator 4 and the exhaust speed of the exhaust fan 6 according to the n-pentane concentration value of the n-pentane concentration sensor B7, so that the n-pentane concentration value in the detection cabin 1 detected by the n-pentane concentration sensor B7 is controlled to be 150-200ppm; the control unit 11 uses a computer to record and display the average n-pentane concentration value of the n-pentane concentration sensor B7 in each 30s, the accumulated n-pentane concentration value of the n-pentane concentration sensor A8 in each 30s and the accumulated inspiration value of the flowmeter 10 in each 30 s.
Example 2:
the embodiment provides a method for testing the leakage amount of an oxygen mask for an airplane, which comprises the following specific steps:
step one, taking down a gas storage bag of the oxygen mask 2, and installing a mask sealing tool 12 on the oxygen mask 2;
step two, the subject 3 enters the detection cabin 1, correctly wears the oxygen mask 2, and normally breathes, and then measures the concentration value of n-pentane in a breathing cavity between the oxygen mask 2 and the subject 3 through an n-pentane concentration sensor A8, and starts the next step when the concentration value of n-pentane is stabilized to be 0;
step three, the control unit 11 is used for opening the n-pentane generator 4 and according to the n-pentane concentration value C of the n-pentane concentration sensor B7 0 The air supply speed of the n-pentane generator 4 and the exhaust speed of the exhaust fan 6 are controlled so that the n-pentane concentration value C in the detection chamber 1 detected by the n-pentane concentration sensor B7 0 After the concentration is stabilized at 150-200ppm, starting timing to test, and testing for at least 3min by a subject 3; in this example, the test time of subject 3 was 3min;
step four, the subject 3 breathes normally in the detection chamber 1, and the average n-pentane concentration value C of the n-pentane concentration sensor B7 in every 30s is recorded and displayed through the control unit 11 0i The cumulative n-pentane concentration value C of the n-pentane concentration sensor A8 in every 30s i And the cumulative inspiration value V of the flowmeter 10 in every 30s Inhale i (ii) a Wherein i is 30s, i =1,2,3, \8230, n is more than or equal to 6; in the present embodiment, n =3min/30s =6;
step five, after the test is finished, the control unit 11 automatically calculates the mask leakage amount Ke, and the calculation formula is as follows:
in the present embodiment, it is preferred that,
in summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An aircraft oxygen mask leakage test device, comprising: the device comprises a detection cabin (1), an oxygen mask (2), a n-pentane generator (4), an exhaust fan (6), a n-pentane concentration sensor B (7), a n-pentane concentration sensor A (8), a n-pentane filter (9), a flowmeter (10), a control unit (11) and a mask sealing tool (12);
a subject (3) to be tested is accommodated in the detection cabin (1); the face of the subject (3) is wearing an oxygen mask (2); a breathing cavity is formed between the inner surface of the oxygen mask (2) and the face of the subject (3);
be equipped with on oxygen mask (2) with the communicating three hole of breathing cavity, three hole is respectively: an inspiration hole, an expiration hole and an oxygen supply hole;
the mask sealing tool (12) is installed on the oxygen mask (2), three interfaces are arranged on the mask sealing tool (12), and the three interfaces are an interface I, an interface II and an interface III respectively; one end of the first interface is connected with an exhalation hole of the oxygen mask (2), and the other end of the first interface extends out of the detection cabin (1) through an exhalation pipeline and is communicated with air outside the detection cabin (1); one end of the second connector is connected with an air suction hole of the oxygen mask (2), and the other end of the second connector extends out of the detection cabin (1) through an air suction pipeline and is communicated with air outside the detection cabin (1); the air suction pipeline is respectively provided with a n-pentane filter (9) and a flowmeter (10); the n-pentane filter (9) is used for filtering n-pentane in air outside the detection cabin (1); the flow meter (10) is for measuring an inspiratory volume of a subject (3); one end of the third interface is connected with an oxygen supply hole of the oxygen mask (2), and the other end of the third interface is connected with a n-pentane concentration sensor A (8) positioned outside the detection chamber (1) through a measurement pipeline and used for detecting the n-pentane concentration in the breathing cavity;
the n-pentane generator (4) is arranged in the detection cabin (1) and used for providing n-pentane gas for the detection cabin (1);
the n-pentane concentration sensor B (7) is communicated with the inner cavity of the detection cabin (1) through a pipeline and is used for detecting the n-pentane concentration in the detection cabin (1);
the exhaust fan (6) is arranged on the detection cabin (1) and is used for exhausting gas in the detection cabin (1);
the control unit (11) is respectively electrically connected with the n-pentane generator (4), the exhaust fan (6), the n-pentane concentration sensor B (7), the n-pentane concentration sensor A (8) and the flowmeter (10); the control unit is used for controlling the rotating speeds of the n-pentane generator (4) and the exhaust fan (6), and recording and displaying an n-pentane concentration value of the pentane concentration sensor A (8), an n-pentane concentration value of the n-pentane concentration sensor B (7) and an air suction quantity value of the flowmeter (10).
2. The aircraft oxygen mask leakage test device according to claim 1, further comprising a mixing fan (5), wherein the mixing fan (5) is mounted on the detection cabin (1) and is used for uniformly mixing the gas in the detection cabin (1).
3. The aircraft oxygen mask leakage test device according to claim 1, wherein the control unit (11) controls the air supply speed of the n-pentane generator (4) and the exhaust speed of the exhaust fan (6) according to the n-pentane concentration value of the n-pentane concentration sensor B (7) so that the n-pentane concentration value in the detection chamber (1) detected by the n-pentane concentration sensor B (7) is controlled within a set range.
4. An aircraft oxygen mask leak testing device according to claim 3, wherein the concentration of n-pentane in the detection chamber (1) is set within the range of 150-200ppm.
5. An aircraft oxygen mask leak test apparatus according to any one of claims 1 to 4, wherein the control unit (11) records and displays the average n-pentane concentration value of the n-pentane concentration sensor B (7) per 30s, the accumulated n-pentane concentration value of the n-pentane concentration sensor A (8) per 30s and the accumulated inspiration value of the flow meter (10) per 30 s.
6. An aircraft oxygen mask leak testing device according to any one of claims 1 to 4, wherein the range of the flow meter (10) is not less than 50LPM.
7. An aircraft oxygen mask leak testing apparatus according to any one of claims 1 to 4, wherein the n-pentane concentration sensor A (8) has a turndown of not less than 50ppm.
8. An aircraft oxygen mask leak testing device according to any one of claims 1 to 4, wherein the n-pentane concentration sensor B (7) has a turndown of not less than 500ppm.
9. The method for testing the leakage amount of the oxygen mask for the airplane is based on the testing device of claim 1, and is characterized by comprising the following specific steps of:
measuring an n-pentane concentration value in a respiratory cavity between the oxygen mask (2) and a subject (3) through an n-pentane concentration sensor A (8), and starting the next step when the n-pentane concentration value is stabilized to be 0;
step two, the normal pentane generator (4) is turned on through the control unit (11), and the normal pentane concentration value C of the normal pentane concentration sensor B (7) is obtained 0 Controlling the air supply speed of the n-pentane generator (4) and the exhaust speed of the exhaust fan (6) to enable the n-pentane concentration value C in the detection chamber (1) detected by the n-pentane concentration sensor B (7) 0 After the stability is within the set range, starting to test for l;
step three, the subject (3) breathes normally in the detection chamber (1), and the level of the n-pentane concentration sensor B (7) in each set time length L is recorded and displayed through the control unit (11)Average n-pentane concentration value C 0i And the accumulated n-pentane concentration value C of the n-pentane concentration sensor A (8) in each set time length L i And the cumulative inspiration value V of the flowmeter (10) in each set time length L Inhale i (ii) a Wherein i is the number of the set duration L, and i =1,2,3, \8230; n = test duration L/set duration L;
step four, after the test is finished, the control unit (11) automatically calculates the mask leakage amount K e The calculation formula is as follows:
10. the aircraft oxygen mask leak testing method of claim 9, wherein said set time period L is 30s; the test duration l is at least 3min.
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| CN115393260B (en) * | 2022-05-16 | 2025-07-25 | 东华大学 | Visual mask adhesion test and evaluation method |
| CN115615625A (en) * | 2022-09-26 | 2023-01-17 | 中国船舶重工集团公司第七一八研究所 | Device and method for rapidly testing leakage amount of oxygen mask for airplane |
| CN115575108A (en) * | 2022-09-29 | 2023-01-06 | 中国船舶重工集团公司第七一八研究所 | Device and method for rapidly testing oxygen supply performance of oxygen mask for airplane |
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| US7614280B1 (en) * | 2006-03-06 | 2009-11-10 | The United States Of America As Represented By The Secretary Of The Army | Quantitative fit test system and method for assessing respirator biological fit factors |
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