阅读说明：本技术 一种飞机用氧气面罩泄漏量测试装置及方法 (Device and method for testing leakage amount of oxygen mask for airplane ) 是由 董众豹 李栋梁 马迪 刘彤 郭佳能 闫亚辉 于 2021-06-07 设计创作，主要内容包括：本发明公开了一种飞机用氧气面罩泄漏量测试装置及方法,该装置包括：检测舱、氧气面罩、正戊烷发生器、排气扇、正戊烷浓度传感器B、正戊烷浓度传感器A、正戊烷过滤器、流量计、控制单元及面罩密封工装；检测舱内容纳有受试者；受试者的面部佩戴有氧气面罩；氧气面罩的内表面与受试者的面部之间形成呼吸空腔；面罩密封工装安装在氧气面罩上,面罩密封工装通过管路与检测舱的外部相通,所述管路上安装有正戊烷浓度传感器A、正戊烷过滤器、流量计；正戊烷发生器放置在检测舱内；正戊烷浓度传感器B通过管路与检测舱的内腔相通；排气扇安装在检测舱上；本发明能够对氧气面罩的泄漏量进行定量测量。(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.)

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 test subject (3) to be tested is accommodated in the detection cabin (1); an oxygen mask (2) is worn on the face of the subject (3); 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;

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 used for measuring the inspiration volume of the 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 and 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. The aircraft oxygen mask leakage testing device as claimed in claim 3, wherein the concentration value of n-pentane in the detection chamber (1) is set within the range of 150 and 200 ppm.

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 50 LPM.

7. An aircraft oxygen mask leak testing device according to any one of claims 1 to 4, wherein the n-pentane concentration sensor A (8) has a turndown of not less than 50 ppm.

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 500 ppm.

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 control unit (11) opens the n-pentane generator (4) and the n-pentane concentration value C of the n-pentane concentration sensor B (7)₀Controlling 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)₀After 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 average n-pentane concentration value C of the n-pentane concentration sensor B (7) in each set time length L is recorded and displayed through the control unit (11)_0iAnd the accumulated n-pentane concentration value C of the n-pentane concentration sensor A (8) in each set time length L_iAnd the accumulated inspiration value V of the flowmeter (10) per set period L_{Inhale i}(ii) a Wherein, i is the test duration L/the set duration L, i is 1,2,3, …, n;

step four, after the test is finished, the control unit (11) automatically calculates the mask leakage K_eThe calculation formula is as follows:

10. the aircraft oxygen mask leak test method according to claim 9, wherein the set time period L is 30 s; the test duration is l at least 3 min.

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, the passengers need to be supplied with oxygen 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 cause oxygen in the mask to leak quickly, possibly resulting in oxygen deprivation to passengers, and therefore, it is particularly important to test the leakage of the oxygen mask.

At present, patents such as CN201320835056 (an anti-leakage oxygen mask) and CN201520390115 (an enhanced oxygen mask) study the leakage problem of the oxygen mask from the design angle, but do not measure the leakage amount of the oxygen mask; CN202018002135614 patent of "an oxygen mask air leakage detection device" and the like researches the air tightness of the assembly of each part of the oxygen mask, and the patent does not relate to the problem of leakage between the oxygen mask and the face of a 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; 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; an oxygen mask is worn on the face of the subject; a breathing cavity is formed between an 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 interface is connected with an air suction hole of the oxygen mask, and the other end of the second interface 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 a 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 positioned 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 setting range of the concentration value of n-pentane in the detection chamber is 150-200 ppm.

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 inspiration value of the flow meter in every 30 s.

Further, the range of the flowmeter (10) is not lower than 50 LPM.

Further, the range of the n-pentane concentration sensor A (8) is not lower than 50 ppm.

Further, the range of the n-pentane concentration sensor B (7) is not lower than 500 ppm.

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 an n-pentane concentration value in a respiratory cavity between the oxygen mask and a subject through an n-pentane concentration sensor A, and starting the next step when the n-pentane concentration value is stabilized to be 0;

step two, the n-pentane generator is opened through the control unit according to the conditionsAn n-pentane concentration value C of the n-pentane concentration sensor B₀Controlling 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 B₀After 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_0iAnd the accumulated n-pentane concentration value C of the n-pentane concentration sensor A in each set time length L_iAnd the accumulated inspiration value V of the flowmeter in each set time length L_{Inhale i}(ii) a Wherein, i is the test duration L/the set duration L, i is 1,2,3, …, 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 30 s; the test duration is l at least 3 min.

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, so that the accuracy of the test is ensured.

Drawings

FIG. 1 is a block diagram of a testing 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 the mask sealing tool 12 is provided with three interfaces, namely, an interface one 13, an interface two 14 and an interface three 15;

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 interface 14 is connected with an air suction hole of the oxygen mask 2, and the other end of the second interface 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 50 LPM;

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 outside the detection chamber 1 through a measurement pipeline, and is used for detecting the n-pentane concentration in the respiratory 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 50 ppm;

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 display; the measuring range of the n-pentane concentration sensor B7 is not lower than 500 ppm;

the mixing fan 5 and the exhaust fan 6 are both arranged on the detection cabin 1, and the mixing fan 5 is used for uniformly mixing the gas in the detection cabin 1, namely uniformly mixing the air in the detection cabin 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 chamber 1 detected by the n-pentane concentration sensor B7 is controlled to be 200 ppm; the control unit 11 records and displays 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 flow meter 10 in each 30s by using a computer.

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 opens the n-pentane generator 4 and the n-pentane concentration value C of the n-pentane concentration sensor B7 is obtained₀The 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 B7₀After the temperature stabilized at 150-200ppm, the test was started by timing, and the test subject 3 was tested for at least 3 min; in this example, the test time of subject 3 was 3 min;

step four, the subject 3 breathes normally in the detection chamber 1, and the control unit 11 records and displays the concentration of n-pentane sensor B7 in each stepAverage n-pentane concentration value C within 30s_0iThe cumulative n-pentane concentration value C of the n-pentane concentration sensor A8 in every 30s_iAnd the cumulative inspiration value V of the flowmeter 10 in every 30s_{Inhale i}(ii) a Wherein i is the number of 30s, i is 1,2,3, …, n, and n is more than or equal to 6; in the present embodiment, n is 3min/30s is 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.