CN107219046B - Breathing tube testing device and testing method - Google Patents
Breathing tube testing device and testing method Download PDFInfo
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- CN107219046B CN107219046B CN201710591500.0A CN201710591500A CN107219046B CN 107219046 B CN107219046 B CN 107219046B CN 201710591500 A CN201710591500 A CN 201710591500A CN 107219046 B CN107219046 B CN 107219046B
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- 230000029058 respiratory gaseous exchange Effects 0.000 title claims abstract description 163
- 238000012360 testing method Methods 0.000 title claims abstract description 145
- 230000000241 respiratory effect Effects 0.000 claims abstract description 5
- 238000009423 ventilation Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 230000004382 visual function Effects 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 64
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 241000428199 Mustelinae Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a testing device and a testing method of a respiratory tube, wherein the testing device comprises an air source pipeline, a first pipeline and a second pipeline; one end of the first pipeline is connected with one end of the air source pipeline, the other end of the first pipeline is provided with a first test interface used for being connected with an exhalation port of the breathing tube, and a first flowmeter is arranged on the first pipeline; the second pipeline is provided with a second test interface for connecting with a breathing port of the breathing tube, and a wet flowmeter is arranged on the second pipeline; the other end of the air source pipeline is used for connecting an air source; when the first test interface is connected with the breathing opening of a breathing tube and the second test interface is connected with the breathing opening of the breathing tube, the air source pipeline, the first pipeline and the second pipeline are communicated to form a test passage for testing the reverse air leakage of the breathing tube. The invention solves the defect that the breathing tube needs to be developed according to the standard requirement when indexes such as reverse air leakage and the like of the breathing tube are tested in the prior art.
Description
Technical Field
The invention belongs to the field of testing of respiratory devices, and relates to a respiratory tube testing device and a respiratory tube testing method.
Background
In the production, subsequent test and maintenance processes of the respirator, a series of tests are required to be carried out on parameters such as air tightness, ventilation resistance, reverse air leakage and the like. However, at present, no shaped product exists at home and abroad, and the indexes of the respirator can be uniformly tested and are required to be developed according to related standard requirements.
Disclosure of Invention
The invention aims to provide a device and a method for testing a breathing tube, and aims to solve the defect that the breathing tube needs to be automatically developed according to standard requirements when indexes such as reverse air leakage and the like of the breathing tube are tested in the prior art.
Another object of the present invention is to realize visualization of a wet flowmeter when testing the reverse air leakage of a breathing tube, and to avoid the problem of too much or too little water addition.
It is still another object of the present invention to provide a simple and convenient simultaneous testing of reverse ventilation, tightness and ventilation resistance of a breathing tube.
In order to solve the technical problems, the invention provides a testing device for a breathing tube, which can test the reverse air leakage of the breathing tube and comprises an air source pipeline, a first pipeline and a second pipeline; one end of the first pipeline is connected with one end of the air source pipeline, the other end of the first pipeline is provided with a first test interface used for being connected with an exhalation port of the breathing tube, and a first flowmeter is arranged on the first pipeline; the second pipeline is provided with a second test interface for connecting with a breathing port of the breathing tube, and a wet flowmeter is arranged on the second pipeline; the other end of the air source pipeline is used for connecting an air source; when the first test interface is connected with an exhalation port of a breathing tube and the second test interface is connected with a breathing port of the breathing tube, the air source pipeline, the first pipeline and the second pipeline are communicated to form a test passage for testing reverse air leakage of the breathing tube.
Further, a first pressure reducing device for reducing the pressure of the gas in the gas source pipeline is arranged on the gas source pipeline.
Further, the first pressure reducing device is a filtering pressure reducer.
Further, a second pressure reducing device for reducing the pressure of the gas in the first pipeline is arranged on the first pipeline.
Further, the second pressure reducing device is a pressure reducer or a water column bottle.
Further, a first stop valve is arranged on the first pipeline.
Further, a second stop valve is arranged on the second pipeline.
Further, the testing device also comprises a third pipeline, one end of the third pipeline is connected with one end of the air source pipeline, and the other end of the third pipeline is provided with a third testing interface used for being connected with the air suction port of the breathing tube; the third pipeline is provided with a third stop valve, a third flowmeter and a pressure gauge, and the pressure gauge is arranged between the third stop valve and the third test interface. After the third pipeline and related devices are arranged, the testing device can also test the ventilation resistance and the tightness of the breathing tube.
Further, the wet flowmeter is a wet flowmeter with a visual function.
The invention also provides a test method of the breathing tube, which adopts the test device and comprises the following steps:
s11: connecting the first test interface with an exhalation port of a breathing tube, connecting the second test interface with a respiration port of the breathing tube, and sealing an inhalation port of the breathing tube;
s12: opening an air source to enable the air pressure in the air source pipeline to reach a first set air pressure value, and adjusting the first flowmeter to enable the air flow in the first pipeline to reach a first set flow value;
s13: and taking the flow value of the wet flowmeter as the reverse air leakage of the breathing tube.
Further, a first pressure reducing device for reducing the pressure of the gas in the gas source pipeline is arranged on the gas source pipeline; in the S12: and adjusting the first pressure reducing device to enable the gas pressure in the gas source pipeline to reach the first set gas pressure value.
Further, a first pressure reducing device for reducing the pressure of the gas in the gas source pipeline is arranged on the gas source pipeline, and a second pressure reducing device for reducing the pressure of the gas in the first pipeline is arranged on the first pipeline; in S12, the first pressure reducing device is adjusted to make the gas pressure in the gas source pipeline reach a second set gas pressure value, and the second pressure reducing device is adjusted to make the gas pressure in the first pipeline reach the first set gas pressure value.
Further, the first set air pressure value is 980+/-10 Pa, and the first set flow value is 1.5+/-0.1L/min.
Further, the second set air pressure value is 70+/-30 KPa.
Further, a first stop valve is arranged on the first pipeline, a second stop valve is arranged on the second pipeline, and in the step S11, the first stop valve and the second stop valve are opened.
Further, the testing device also comprises a third pipeline, one end of the third pipeline is connected with one end of the air source pipeline, and the other end of the third pipeline is provided with a third testing interface used for being connected with the air suction port of the breathing tube; a third stop valve is arranged on the third pipeline; in S11, the third test port is connected to the air inlet of the breathing tube, and the third stop valve is closed.
Further, a third flowmeter and a pressure gauge are further arranged on the third pipeline, and the pressure gauge is arranged between the third stop valve and the third test interface; the test method further comprises the following steps:
s21: connecting the third test interface with an air suction port of a breathing tube, sealing a breathing port and an exhalation port of the breathing tube, opening the third stop valve, and closing the first stop valve;
s22: opening the air source, enabling the air pressure in the air source pipeline to reach a third set air pressure value, and adjusting the third flowmeter to enable the air flow in the third pipeline to reach a second set flow value;
s23: when the reading of the pressure gauge is equal to a fourth set air pressure value, closing the third stop valve;
s24: observing whether the reading of the pressure gauge is reduced, if so, judging that the tightness of the breathing tube is unqualified; and if the reading of the pressure gauge is kept unchanged, judging that the tightness of the breathing tube is qualified.
Further, in S21, the first test interface is connected to the exhalation port of the breathing tube, the second test interface is connected to the respiration port of the breathing tube, the third stop valve is opened, and the first stop valve and the second stop valve are closed, so that the respiration port and the exhalation port of the breathing tube are sealed.
Further, the third set air pressure value is 70+/-30 KPa, the second set flow value is 30+/-2L/min, and the fourth set air pressure value is 1.5KPa.
Further, the steps S21 to S24 are performed before or after the steps S11 to S13.
Further, the test method further comprises the following steps:
s31: connecting the third test interface with an air suction port of a breathing tube, sealing an air exhaling port of the breathing tube, enabling the air exhaling port of the breathing tube to be communicated with the outside, opening the third stop valve, and closing the first stop valve;
s32: opening the air source, enabling the air pressure in the air source pipeline to reach a fifth set air pressure value, adjusting the third flowmeter to enable the air flow in the third pipeline to reach a third set flow value, and recording the reading P of the pressure gauge at the moment 1 ；
S33: removing the breathing tube from the test device and then recording the reading P of the manometer 0 Will P 1 -P 0 As a resistance to ventilation of the breathing tube.
Further, in S31, the first test interface is connected to the exhalation port of the breathing tube, and the first stop valve is closed, so that the exhalation port of the breathing tube is sealed.
Further, the fifth set air pressure value is 70+/-30 KPa, and the third set flow value is 30+/-2L/min.
Further, the steps S31 to S33 are performed before or after the steps S11 to S13.
Compared with the prior art, the invention provides the performance testing device for the breathing tube, which can simply and conveniently test the reverse air leakage of the breathing tube. In addition, the wet flowmeter with the visual window is adopted to test the reverse air leakage, so that the added water quantity can be accurately defined, and the influence of excessive or insufficient water quantity on the detection precision of the wet flowmeter is avoided. In addition, the testing device provided by the invention can test the reverse air leakage, the tightness and the ventilation resistance of the breathing tube simultaneously through the conversion of the stop valve, has a simple operation method, and is beneficial to improving the testing efficiency.
Drawings
FIG. 1 is a schematic view of a breathing tube;
FIG. 2 is a schematic diagram of a breathing tube testing device according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of a breathing tube connection to a testing device for a breathing tube according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a breathing resistance testing device using a breathing tube according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a test for reverse ventilation of a breathing tube according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating the testing of the tightness of a breathing tube according to an embodiment of the present invention;
FIG. 7 is a flow chart of a test for ventilation resistance of a breathing tube according to an embodiment of the present invention;
wherein, 10-breathing tube; 1,2, 3-hose; a 4-T-joint; 11-exhale port; 12-breathing port; 13-suction port; 20-air source; 30-a first pressure relief device; 31-a second pressure relief device; 41-a first shut-off valve; 42-a second shut-off valve; 43-a third stop valve; 51-a first flowmeter; 52-a wet flow meter; 53-a third flowmeter; 60-a pressure gauge; 71-a first test interface; 71-a second test interface; 73-a third test interface; 80-an air source pipeline; 81-a first conduit; 82-a second conduit; 83-third pipeline.
Detailed Description
The following describes in further detail a testing device and a testing method for a breathing tube according to the present invention with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. The same or similar reference numbers in the drawings refer to the same or similar parts.
The breathing tube is a gas path connecting part used on respirators (such as an isolated oxygen respirator and a positive pressure oxygen respirator) and is used for ensuring unidirectional circulation of a gas path. Fig. 1 is a block diagram of a breathing tube 10. As shown in fig. 1, the hose 2 and the hose 3 of the breathing tube 10 are connected to three ports of a T-joint 4, respectively, wherein an exhalation valve is installed at the free end of the hose 1 and an inhalation valve is installed at the free end of the hose 2. When the respirator is in use, the exhalation valve is connected with a cartridge, the inhalation valve is connected with an ice bucket, and the free end of the hose 3 is connected with a mask. Generally, when testing the performance of the respirator, such as the air tightness, the reverse air leakage, the ventilation resistance and the like, the breathing tube 10 is only required to be tested according to the corresponding indexes. The hose 1 is provided with a port of an exhalation valve as exhalation port 11, the hose 2 is provided with a port of an inhalation valve as inhalation port 13, and the free end of the hose 3 as exhalation port 12.
Fig. 2 is a schematic diagram of a breathing tube testing device according to an embodiment of the present invention. Referring to fig. 2, a breathing tube testing device includes: a gas source conduit 80, a first conduit 81 and a second conduit 82; one end of the first pipe 81 is connected to one end of the air source pipe 80, the other end is provided with a first test interface 71 for connecting with the exhalation port 11 of the breathing tube, the first pipe 81 is provided with a first flowmeter 51, for example, a gas turbine flowmeter, for adjusting the flow value of the air in the first pipe 81, and the first flowmeter 51 can be arranged at any position of the first pipe 81, for example, at a position of the first pipe 81 close to the air source pipe 80; the second pipe 82 is provided with a second test interface 72 for connecting with the breathing port of the breathing tube, the second pipe 82 is provided with a wet flowmeter 52, the wet flowmeter 52 is preferably a wet flowmeter with a visual function for measuring the flow value of gas entering the wet flowmeter, and the shell of the wet flowmeter 52 is provided with a circumferential visual window, so that the visualization is realized, and the excessive or the insufficient water addition is avoided; the other end of the air source pipeline 80 is used for connecting an air source 20; when the first test interface 71 is connected to the breathing port 11 of a breathing tube and the second test interface 72 is connected to the breathing port 12 of the breathing tube, the air source pipe 80, the first pipe 81 and the second pipe 82 are communicated to form a test path for testing the reverse air leakage of the breathing tube.
The performance testing device of the breathing tube may further comprise a third pipe 83, one end of the third pipe 83 is connected to one end of the air source pipe 80, and the other end has a third testing interface 73 for connecting to the air suction port 13 of the breathing tube; the third pipe 83 is provided with a third stop valve 43, a third flowmeter 53 and a pressure gauge 60 for measuring the pressure of the gas in the third pipe 83, wherein the third stop valve 43 and the third flowmeter 53 may be disposed at any position of the third pipe 83, and the pressure gauge 60 may be disposed between the third stop valve 43 and the third test port 73.
It should be noted that, in this embodiment, the air source pipe 80, the first pipe 81, the second pipe 82, and the third pipe 83 may each be formed by multiple sections of pipes, and meters, valves, etc. disposed on the pipes may be disposed at the connection positions of two adjacent sections of pipes.
The gas source pipe 80 may be provided with a first pressure reducing device 30 for reducing the pressure of the gas in the gas source pipe 80 and the first pipe 81 and the third pipe 83. The first pressure reducing device 30 is preferably a filtering pressure reducer, which can filter the gas of the gas source 20 while playing a role in reducing pressure, and the purpose of filtering is to remove impurities in the gas source, so that on one hand, the influence of impurities on the detection result is eliminated, and meanwhile, the influence of impurities in the gas source on the performance of the breathing tube in the testing process can be prevented, and the normal use of the breathing tube is ensured. Further, when the gas pressure of the gas source 20 is large and a wide range of adjustment is required for the gas pressure in the first pipe 81, if the adjustment range of the first pressure reducing device 30 is limited, a better effect may not be achieved by the action of the first pressure reducing device 30 alone, and therefore, the first pipe 81 may be further provided with the second pressure reducing device 31, for example, a pressure reducer or a water bottle, and the second pressure reducing device 31 may be a water bottle.
A first stop valve 41 may be disposed on the first pipe 81, a second stop valve 42 may be disposed on the second pipe, a third stop valve 43 may be disposed on the third pipe, and whether the first pipe 81, the second pipe 82 and the third pipe 83 are communicated with the air source pipe 80 may be determined by opening and closing three stop valves, so that the test device may simultaneously determine a plurality of parameters of the breathing tube by switching the stop valves.
In the testing device provided by the invention, the connecting pipelines (comprising the air source pipeline 80, the first pipeline 81, the second pipeline 82 and the third pipeline 83) among the components mainly adopt rubber pipelines, and the connecting position of the air source pipeline 80 and the first pipeline 81 and the third pipeline 83 is a tee joint, and can be connected by adopting a metal head.
When the first pressure reducer 30 is a filtering pressure reducer, the brand of the filtering pressure reducer is Air TAC, GFR2008-08, and the maximum pressure output is 1mpa, adj. 0.15-0.9MPa. The third flowmeter 53 is, for example, of a double-ring type with a specification of 5-45L/min and a precision of 2.5. The pressure gauge 60 is manufactured by Martens, model UNICON-P-1-3-0-11, specification 0-3000Pa, and index value 10Pa. The brand of the first flowmeter 51 is, for example, double-ring, and has a specification of 0.3-3L/min and a precision of 4 levels. Wet flow meter 52 is an accumulating flow meter capable of detecting the air leakage of the system, model exampleFor example, LML-2, measuring range is 0.1-1m 3 Per hour, a revolution volume of 5dm 3 The maximum operating pressure is 5kpa. Experiments show that the combination mode can obtain better test effect. It should be understood that the performance testing apparatus of the breathing tube of the present invention is not limited to the above-listed brands and models, but may be implemented with other brands and/or models of filter decompressors and/or flow meters.
The testing device provided by the embodiment can be used for testing the reverse air leakage, the sealing performance and the ventilation resistance of the breathing tube at the same time, and the following three testing methods are respectively introduced.
As shown in fig. 3 and fig. 5, when the testing device provided in this embodiment is used to test the reverse ventilation of the breathing tube, the method specifically includes the following steps:
s11: connecting the first test port 71 to the exhalation port 11 of a breathing tube, connecting the second test port 72 to the breathing port 12 of the breathing tube, and sealing the inhalation port 13 of the breathing tube; the purpose of this step is to have the air supply conduit 80, the first conduit 81 and the second conduit 82 communicate with a test path constituting a reverse air leakage of a test breathing tube to participate in the test, while the third conduit 83 does not participate in the test, so that the first and second shut-off valves 41 and 42 should be opened when the first and second conduits 81 and 82 have shut-off valves; preferably, the air inlet 13 may be connected to the third test port 73, and the sealing state of the air inlet 13 may be ensured by closing the third shut-off valve 43;
s12: opening the gas source 20 to make the gas pressure in the gas source pipeline 80 reach a first set gas pressure value (preferably 980+ -10 Pa), and adjusting the first flowmeter 51 to make the gas flow in the first pipeline 81 reach the first set flow value (preferably 1.5+ -0.1L/min); preferably, when the pressure of the gas directly supplied from the gas source 20 is insufficient to meet the requirement of the first set pressure value, a first pressure reducing device 30 is disposed on the gas source pipeline 80 to adjust the pressure value of the gas source pipeline 80, and the first pressure reducing device 30 is further preferably a filtering pressure reducer, so as to filter the gas of the gas source 20 while playing a role of reducing pressure. When the gas pressure of the gas source 20 is great, the first pressure reducing device 30 is insufficient to adjust the gas pressure to 980±10Pa, the gas pressure in the gas source pipeline 80 is adjusted to a second set gas pressure value (preferably 70±30 KPa) by adjusting the first pressure reducer 30, and then the gas pressure in the first pipeline 81 is adjusted to be equal to the first set gas pressure value by adjusting the pressure reducing device 31;
s13: the flow rate value of the wet flowmeter 52 is set as the reverse ventilation of the breathing tube.
As shown in fig. 3 and 6, when the testing device provided in this embodiment is used to test the tightness of the breathing tube, the method specifically further includes the following steps:
s21: connecting the third test port 73 with the air suction port 13 of a breathing tube, sealing the breathing port 12 and the exhalation port 11 of the breathing tube, opening the third stop valve 43, and closing the first stop valve 41; the purpose of this step is to connect the third pipe 83 to the air source pipe 80 to participate in the test, while the first pipe 81 and the second pipe 82 do not participate in the test, and preferably, the exhalation port 11 and the respiration port 12 may be connected to the first test port 71 and the second test port 72, respectively, and the sealing state of the exhalation port 11 and the respiration port 12 may be ensured by closing the first stop valve 41 and the second stop valve 42;
s22: opening the gas source 20, and adjusting the gas flow rate in the third flow meter 53 to a second set flow rate value (preferably 30±2L/min) by adjusting the gas pressure in the gas source pipe 80 to a third set gas pressure value (preferably 70±30 KPa);
s23: closing the third shut-off valve 43 when the reading of the pressure gauge 60 is equal to a fourth set pressure value (preferably 1.5 KPa);
s24: observing whether the reading of the pressure gauge 60 is reduced, and if the reading of the pressure gauge 60 is reduced, judging that the tightness of the breathing tube is not qualified; if the reading of the pressure gauge 60 remains unchanged, the leak tightness of the breathing tube is judged to be acceptable.
As shown in fig. 4 and fig. 7, when the ventilation resistance of the breathing tube is tested by using the testing device provided by the embodiment, the method specifically further includes the following steps:
s31: connecting the third test interface 73 with the air suction port 13 of a breathing tube, sealing the breathing port 11 of the breathing tube, communicating the breathing port 12 of the breathing tube with the outside, opening the third stop valve 43, and closing the first stop valve 41; the purpose of this step is to allow the third pipe 83 to communicate with the air source pipe 80 to participate in the test, while the first pipe 81 and the second pipe 82 do not participate in the test, and preferably, the exhalation port 11 may be connected to the first test port 71, and the sealing state of the exhalation port 11 may be ensured by closing the first stop valve 41;
s32: opening the gas source 20, adjusting the gas flow rate in the third flow meter 53 to a third set flow rate value (preferably 30+ -2L/min) by adjusting the gas pressure in the gas source pipe 80 to a fifth set gas pressure value (preferably 70+ -30 KPa), and recording the reading P of the pressure meter at this time 1 ；
S33: the breathing tube 10 is removed from the test device and the reading P of the pressure gauge 60 is recorded 0 Will P 1 -P 0 As a resistance to ventilation of the breathing tube.
In the invention, the performance testing device of the breathing tube can be used for independently testing the reverse air leakage of the breathing tube, and the performance testing device of the breathing tube can be used for testing the tightness and/or the ventilation resistance of the breathing tube before or after the reverse air leakage of the breathing tube is tested. The invention does not limit the sequence of the reverse ventilation, tightness and ventilation resistance tests of the breathing tube, the S21-S24 can be performed before or after the S11-S13, and the S31-S33 can be performed before or after the S11-S13.
In summary, the invention provides a performance testing device for a breathing tube, which can simply and conveniently test the reverse air leakage of the breathing tube. In addition, the wet flowmeter with the visual window is adopted to test the reverse air leakage, so that the added water quantity can be accurately defined, and the influence of excessive or insufficient water quantity on the detection precision of the wet flowmeter is avoided. In addition, the testing device provided by the invention can test the reverse air leakage, the tightness and the ventilation resistance of the breathing tube simultaneously through the conversion of the stop valve, has a simple operation method, and is beneficial to improving the testing efficiency.
It should be noted that, in the present description, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the test method disclosed in the embodiment, since the test device adopted by the test method corresponds to the device part disclosed in the embodiment, the description of the test device involved in the test method is relatively simple, and the relevant points are referred to the description of the device part.
The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (12)
1. The device for testing the breathing tube is characterized by comprising an air source pipeline, a first pipeline, a second pipeline and a third pipeline;
one end of the first pipeline is connected with one end of the air source pipeline, the other end of the first pipeline is provided with a first test interface used for being connected with an exhalation port of the breathing tube, and the first pipeline is provided with a first flowmeter and a first stop valve;
the second pipeline is provided with a second test interface for connecting with a breathing port of the breathing tube, and a wet flowmeter and a second stop valve are arranged on the second pipeline; wherein the wet flowmeter is a wet flowmeter with a visual function;
one end of the third pipeline is connected with one end of the air source pipeline, and the other end of the third pipeline is provided with a third test interface used for being connected with an air suction port of the breathing pipe; the third pipeline is provided with a third stop valve, a third flowmeter and a pressure gauge, and the pressure gauge is arranged between the third stop valve and the third test interface;
the other end of the air source pipeline is used for connecting an air source;
when the first test interface is connected with an exhalation port of a breathing tube and the second test interface is connected with a breathing port of the breathing tube, the air source pipeline, the first pipeline and the second pipeline are communicated to form a test passage for testing the reverse air leakage of the breathing tube;
when the third test interface is connected with the air suction port of the breathing tube and the breathing port and the exhalation port of the breathing tube are sealed, the air source pipeline is communicated with the third pipeline to form a test passage for testing the tightness of the breathing tube;
when the third test interface is connected with the air suction port of the breathing tube, the breathing port of the breathing tube is communicated with the outside, and the breathing port is sealed, the air source pipeline is communicated with the third pipeline to form a test passage for testing the ventilation resistance of the breathing tube;
the air source pipeline is provided with a first pressure reducing device for reducing the pressure of the air in the air source pipeline, and the first pressure reducing device is a filtering pressure reducer; the first pipeline is provided with a second decompression device for decompressing the gas in the first pipeline.
2. The breathing tube testing device of claim 1 wherein the second pressure relief device is a pressure reducer or a water bottle.
3. A method of testing a breathing tube using the test device of claim 1, comprising the steps of:
s11: opening the first stop valve and the second stop valve, closing the third stop valve, connecting the first test interface with an exhalation port of a breathing tube, connecting the second test interface with a respiration port of the breathing tube, and sealing an air suction port of the breathing tube;
s12: opening the air source, adjusting the first pressure reducing device to enable the air pressure in the air source pipeline to be a second set air pressure value, adjusting the second pressure reducing device to enable the air pressure in the first pipeline to be a first set air pressure value, and adjusting the first flowmeter to enable the air flow in the first pipeline to be a first set flow value;
s13: and taking the flow value of the wet flowmeter as the reverse air leakage of the breathing tube.
4. The method of claim 3, wherein the first set pressure value is 980±10Pa, the first set flow value is 1.5±0.1L/min, and the second set pressure value is 70±30KPa.
5. The method for testing a respiratory tube of claim 3,
the method also comprises the following steps:
s21: connecting the third test interface with an air suction port of a breathing tube, sealing a breathing port and an exhalation port of the breathing tube, opening the third stop valve, and closing the first stop valve;
s22: opening the air source, enabling the air pressure in the air source pipeline to reach a third set air pressure value, and adjusting the third flowmeter to enable the air flow in the third pipeline to reach a second set flow value;
s23: when the reading of the pressure gauge is equal to a fourth set air pressure value, closing the third stop valve;
s24: observing whether the reading of the pressure gauge is reduced, if so, judging that the tightness of the breathing tube is unqualified; and if the reading of the pressure gauge is kept unchanged, judging that the tightness of the breathing tube is qualified.
6. The method according to claim 5, wherein in S21, the first test port is connected to an exhalation port of the breathing tube, the second test port is connected to a respiration port of the breathing tube, the third shut-off valve is opened, and the first shut-off valve and the second shut-off valve are closed to seal the respiration port and the exhalation port of the breathing tube.
7. The method of claim 5, wherein the third set pressure value is 70±30KPa, the second set flow value is 30±2L/min, and the fourth set pressure value is 1.5KPa.
8. The method of claim 5, wherein S21-S24 are performed before or after S11-S13.
9. The method of testing a breathing tube of claim 3 further comprising the steps of:
s31: connecting the third test interface with an air suction port of a breathing tube, sealing an air exhaling port of the breathing tube, enabling the air exhaling port of the breathing tube to be communicated with the outside, opening the third stop valve, and closing the first stop valve;
s32: opening the air source, enabling the air pressure in the air source pipeline to reach a fifth set air pressure value, adjusting the third flowmeter to enable the air flow in the third pipeline to reach a third set flow value, and recording the reading P of the pressure gauge at the moment 1 ；
S33: removing the breathing tube from the test device and then recording the reading P of the manometer 0 Will P 1 -P 0 As a resistance to ventilation of the breathing tube.
10. The method of claim 9, wherein in S31, the first test port is connected to an exhalation port of the breathing tube, and the first shut-off valve is closed to seal the exhalation port of the breathing tube.
11. The method of claim 9, wherein the fifth set pressure value is 70±30KPa and the third set flow value is 30±2L/min.
12. The method of testing a breathing tube of claim 9 wherein the steps S31-S33 are performed before or after the steps S11-S13.
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| CN109060274B (en) * | 2018-08-23 | 2024-02-02 | 天津海外海科技有限公司 | Detection device and test method for underwater breathing tube joint |
| CN111044236A (en) * | 2019-12-31 | 2020-04-21 | 湖南明康中锦医疗科技发展有限公司 | Air tightness detection system and method for humidification water box of respiratory support equipment |
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