CN104874067A - Leakage detection method for respirator - Google Patents
Leakage detection method for respirator Download PDFInfo
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- CN104874067A CN104874067A CN201410073918.9A CN201410073918A CN104874067A CN 104874067 A CN104874067 A CN 104874067A CN 201410073918 A CN201410073918 A CN 201410073918A CN 104874067 A CN104874067 A CN 104874067A
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- respirator
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Abstract
The invention discloses a leakage detection method for a respirator. The method includes the steps of connecting an inhalation inlet and an exhalation outlet through a guide pipe; when interior pressure of the guide pipe reaches a preset pressure valve, closing a proportional valve, starting timing, and monitoring the interior pressure of the guide pipe in real time; when the interior pressure of the guide pipe is lower than the preset pressure value, opening the proportional valve until the fact that the interior pressure of the guide pipe is equal to the preset pressure value; when a timed duration is equal to a preset duration value, closing the proportional valve to obtain average flow rate of air flowing by an outlet of the proportional valve in a preset duration, comparing the average flow rate to a standard leakage rate, and judging whether the respirator has a leak. The method has the advantages that the average leakage rate of the respirator is independent of compliance of the guide pipe in use and is dependent on only leakage of a leak point, the leakage of the respirator can be detected simply, accurately and conveniently, and the method is suitable for various respirators.
Description
Technical field
The present invention relates to medical field, especially relate to a kind of leakage detection method for respirator.
Background technology
Point out in correlation technique, when the method adopting pressure to reduce tests the leakage of respirator, it is relevant that pressure reduces the pipeline be connected with outside, the speed that different loine pressures declines is different, two pipelines that such as diameter is identical, and pipeline is long, the speed of pressure drop is just slow, pipeline is shorter, and the speed of pressure drop is just fast, makes this kind of method have certain limitation.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, the object of the invention is to propose a kind of leakage detection method for respirator, the described leakage detection method for respirator can detect the leakage of respirator simply, accurately, easily, and the compliance of the method testing result obtained and the conduit adopted has nothing to do.
According to the leakage detection method for respirator of the present invention, described respirator comprises source of the gas, proportioning valve, air entry and exhalation vents, described proportioning valve is located between described source of the gas and described air entry, and described leakage detection method comprises the following steps: S1, be communicated with by conduit with described exhalation vents by described air entry; S2, close described exhalation vents and open described proportioning valve to make described source of the gas to described conduit conveying gas, closing described proportioning valve when the pressure in described conduit reaches pressure predetermined value, starting timing and pressure in conduit described in Real-Time Monitoring; S3, when the pressure in described conduit lower than opening described proportioning valve during described pressure predetermined value until the pressure in described conduit equals described pressure predetermined value, close described proportioning valve when timing duration equals duration predetermined value, obtain the flow of the described gas flowing through the outlet of described proportioning valve in described duration predetermined value; S4, average leaked rate and slip standard value to be contrasted, when described average leaked rate is greater than described slip standard value, described respirator leaks, when described average leaked rate is less than or equal to described slip standard value, described respirator does not leak, and wherein said average leaked rate is the ratio of described flow in step S3 and described timing duration.
According to the leakage detection method for respirator of the present invention, the average leaked rate of respirator has nothing to do with the compliance of the conduit adopted, only relevant with the leakage rate of leakage point, thus the leakage of respirator can be detected simply, accurately, easily, the leakage detection method of this respirator is practical, and is applicable to various types of respirator.
Alternatively, in step S2, the pressure in described conduit is recorded by pressure transducer, and the contiguous described exhalation vents of described pressure transducer is arranged.Thus, can stablize and monitor test pipeline in pressure.
Further, relief valve is provided with between described proportioning valve and described air entry.
Alternatively, in step S3, described flow is recorded by flow sensor, and described flow sensor is located between described proportioning valve and described relief valve.Thus, the gaseous mass flowed in test pipeline can be detected more exactly.
Alternatively, described pressure predetermined value is 50cmH
2o, described slip standard value is 3ml/s.
Alternatively, described timing duration is 5s.
Particularly, described gas is the mist of air and oxygen.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the respirator of the leakage detection method for respirator according to the embodiment of the present invention;
Fig. 2 is the principle schematic of the leakage detection method of the respirator shown in Fig. 1.
Reference numeral:
100: respirator;
1: air source; 2: source of oxygen; 3: mist device; 31: the outlet of mist device;
4: buffering air-capacitor; 41: the import of buffering air-capacitor; 42: the outlet of buffering air-capacitor;
5: proportioning valve; 51: the import of proportioning valve; 52: the outlet of proportioning valve;
6: flow sensor; 61: the import of flow sensor; 62: the outlet of flow sensor;
7: relief valve; 71: the import of relief valve; 72: air entry; 73: the safe QI KOU of relief valve;
8: outlet valve; 81: exhalation vents; 82: the air vent of outlet valve;
91: the first connection tubes; 92: the three connection tubes; 93: the four connection tubes;
94: suction nozzle; 95: exhaust tube;
10: pressure-measuring-point; 11: conduit;
200: patient.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.
Below with reference to Fig. 1 and Fig. 2, the leakage detection method for respirator 100 according to the embodiment of the present invention is described.Wherein, respirator 100 comprises source of the gas, proportioning valve 5, air entry 72 and exhalation vents 81, and proportioning valve 5 is located between source of the gas and air entry 72.Alternatively, respirator 100 comprises further: relief valve 7, and relief valve 7 is located between proportioning valve 5 and air entry 72.
As shown in Figure 1, the gas that source of the gas provides can be the mist of air and oxygen, can the oxygen equal proportion in the air in air source 1 and source of oxygen 2 be injected in mist device 3 like this, the outlet 31 of mist device is connected with the import 41 of buffering air-capacitor, thus the mist of air and oxygen can be input in buffering air-capacitor 4 by mist device 3, the outlet 42 of buffering air-capacitor is connected by the first connection tube 91 with the import 51 of proportioning valve, the outlet 52 of proportioning valve is connected with the import 71 of relief valve by the second connection tube, the now outlet of relief valve 7 can be understood as air entry 72, opening proportioning valve 5 like this can make the mist in source of the gas enter in the second connection tube, and mist is by discharging from air entry 72 after relief valve 7, air entry 72 is connected to patient 200 by suction nozzle 94, so that the empty oxygen gas mixture of suitable concentration is supplied to patient 200, further, outlet valve 8 is also provided with in respirator 100, the import of outlet valve can be understood as exhalation vents 81, exhalation vents 81 is connected to patient 200 by exhaust tube 95, when outlet valve 8 is opened, the gas that patient 200 breathes out can be discharged by the air vent 82 of outlet valve.Certainly, the present invention is not limited thereto, between proportioning valve 5 and outlet valve 8, other parts can also be provided with, and the throttling element that relief valve 7 can have security protection by other replaces.Wherein, operation principle and the structure of respirator 100 are well known to those skilled in the art, no longer describe in detail here.
Thus, the path that gas from proportioning valve 5 to outlet valve 8 flows through can be understood as the pipeline of relative closure, pressure in this pipeline is equal everywhere, " leakage of respirator 100 " as herein described refers to the leakage of the pipeline that this is closed, that is, the leakage of each part set from proportioning valve 5 to outlet valve 8, and the leakage etc. of junction between each part, the such as leakage of the junction of the second connection tube and relief valve 7, leakage of the leakage of the second connection tube self and the junction of the second connection tube and proportioning valve 5 etc., this pipeline closed is defined as test pipeline herein.In addition, it should be noted that, pressure in test pipeline can be regulated by relief valve 7, when testing the pressure in pipeline and being greater than pressure limit value, the safe QI KOU 73 of relief valve is opened with to aerofluxus outside test pipeline, make the pressure in test pipeline relatively stable and be less than or equal to pressure limit value, thus limiting gas supply flow, ensureing patient safety.
As shown in Figure 2, according to the leakage detection method for respirator 100 of the embodiment of the present invention, comprise the following steps: first air entry 72 is communicated with by conduit 1111 with exhalation vents 81, then close exhalation vents 81 and open proportioning valve 5 and carry gas to make source of the gas conductive pipe 11, when the pressure in conduit 11 reaches pressure predetermined value (such as 50cmH
2o) proportioning valve 5 is closed time, start timing and pressure in Real-Time Monitoring conduit 11, then when the pressure in conduit 11 is lower than opening proportioning valve 5 during pressure predetermined value, until the pressure in conduit 11 equals pressure predetermined value, and make the pressure in conduit 11 maintain pressure predetermined value all the time, proportioning valve 5 is closed when timing duration equals duration predetermined value (such as 5s), obtain the flow of the gas of the outlet 52 flowing through proportioning valve in duration predetermined value, finally average leaked rate and slip standard value (such as 3ml/s) are contrasted, when average leaked rate is greater than slip standard value, respirator 100 leaks, when average leaked rate is less than or equal to slip standard value, respirator 100 does not leak, wherein average leaked rate is the flow of the gas of the outlet 52 flowing through proportioning valve in duration predetermined value and the ratio of timing duration, and this average leaked rate can be understood as the average leaked rate of respirator 100.In addition, it should be noted that, pressure limit value is greater than pressure predetermined value, and the safe QI KOU 73 of relief valve in test process can be avoided thus to open outside aerofluxus, prevents from testing the gas loss in pipeline, affects testing result.
In one of them example of the present invention, with reference to Fig. 2, a conduit 11 that is intact, that do not leak is adopted air entry 72 and exhalation vents 81 to be coupled together, close exhalation vents 81, open proportioning valve 5, to pass into gas in test pipeline, when the pressure in test pipeline is 50cmH
2during O, now close proportioning valve 5, open timer and start timing, and the pressure in Real-Time Monitoring test pipeline, when pressure is less than 50cmH
2during O, illustrate that the gaseous mass in test pipeline reduces, test pipeline leakage is described, now opens proportioning valve 5, in test pipeline, pass into gas, make the pressure of test pipeline maintain 50cmH all the time
2o, proportioning valve 5 is closed after 5s, reading flow is through the gas flow of the outlet 52 of proportioning valve, due to the constant pressure of pipeline, so illustrate that the gas that testing tube road is leaked has been filled in real time, thus the gaseous mass that air entry 72 flows through equals the gaseous mass that test pipeline leaks, the gaseous mass of this leakage and the ratio of duration of ventilation 5s are the average leaked rate of testing pipeline, the i.e. average leaked rate of respirator 100, according to the demand of respirator 100, requires that the average leaked rate of respirator 100 is at 50cmH
23ml/s is less than or equal to time under the pressure of O, thus the average leaked rate recorded is compared with 3ml/s, when the average leaked rate recorded is greater than 3ml/s, illustrate that respirator 100 leaks, defective, when the average leaked rate recorded is less than or equal to 3ml/s, illustrate that respirator 100 meets the requirements, such as when the gas flow of the outlet 52 flowing through proportioning valve is 10ml, average leaked rate is: 10ml/5s=2ml/s, due to 2ml/s<3ml/s, illustrates that respirator 100 meets the requirements.
Here, it should be noted that, when test pipeline is at 50cmH
2under the pressure of O, slip standard value is 3cm/s, and after the pressure change of test pipeline, slip standard value is corresponding to change.
Respirator 100 leakage detection method of the present invention has nothing to do with the compliance of the conduit 11 adopted, that is, the average leaked rate of test pipeline is not by the restriction of conduit 11 compliance, the average leaked rate of test pipeline is only relevant with the leakage rate of leakage point, thus the leakage of respirator 100 can be tested simply, accurately, easily, this respirator 100 leakage detection method is practical, and is applicable to various types of respirator 100.Wherein, be understandable that, when the diameter of conduit 11 is identical, the length of conduit 11 is longer, and the compliance of conduit 11 is larger, and correspondingly, the length of conduit 11 is shorter, and the compliance of conduit 11 is less.
Here, it should be noted that, the compliance of pipeline is exactly the pressure that can produce to the gas that pipeline is certain, and unit is ml/cmH
2o.Such as, inject the gas of 10ml to pipeline with syringe, loine pressure is 20cmH
2o, so the compliance C=10/20=0.5ml/cmH of pipeline
2o.The speed that loine pressure reduces is relevant with the compliance of pipeline, such as, is 0.5ml/cmH respectively with circuit compliance
2o and 0.2ml/cmH
2two pipelines of O test the leakage of respirator, if the slip of respirator is 5ml/s, inject certain gas to pipeline, make loine pressure reach 50cmH
2the pressure on test tube road again after O, 1s, look at that the pressure after every root pipe 1s is respectively how many, first pipe compliance is 0.5ml/cmH
2o, reach 50cmH
2o needs the gas of 25ml (50*0.5=25), and because slip is also remaining 20ml gas after 5ml/s, 1s, loine pressure is 20/0.5=40cmH
2o, can calculate second pipe after the same method and reach 50cmH
2o needs the gas of 10ml, and remaining 5ml after 1s, loine pressure is 5/0.2=25cmH
2o, so illustrate that the speed that a depended on pressure reduces carrys out test for leaks, error is very large, and slip is relevant with the compliance of pipeline, and the long compliance of general pipe is comparatively large, and the short compliance of pipe is less.
Had nothing to do by the following average leaked rate of experimental verification test pipeline and the compliance of conduit 11, a respirator do not leaked 100 and two conduits are used in experiment, two conduits all do not leak, and equal diameters, length are not etc., the conduit defining length shorter is the first conduit, the conduit that definition length is longer is the second conduit, and the compliance of the first conduit is less than the compliance of the second conduit.
Test one, adopt the first conduit to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline does not leak.
Experiment two, on the first conduit, offer a less hole, the average leaked rate of the first conduit is made to be less than or equal to slip standard value, this first conduit is adopted to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline does not leak.
Experiment three, on the first conduit, offer a larger hole, the average leaked rate of the first conduit is made to be greater than slip standard value, this first conduit is adopted to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline leakage.
Test four, adopt the second conduit to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline does not leak.
Experiment five, on the second conduit, offer a less hole, the average leaked rate of the second conduit 11 is made to be less than or equal to slip standard value, this second conduit is adopted to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline does not leak.
Experiment six, on the second conduit, offer a larger hole, the average leaked rate of the second conduit is made to be greater than slip standard value, this second conduit is adopted to be coupled together with exhalation vents 81 by the air entry 72 of respirator 100, carry out the Leak Detection of respirator 100, test result display test pipeline leakage.
Thus comprehensively above-mentioned six experiments can confirm that the compliance of the average leaked rate and conduit 11 of testing pipeline has nothing to do fully.
In addition, it should be noted that, the average leaked rate of conduit 11 can record by the following method, first on conduit 11, a through hole is opened, the pin hole of the syringe do not leaked is extend in conduit 11 from through hole, be connected with conduit 11 to make syringe, and ensure that the pressure in conduit 11 is equal with the pressure in syringe, a Pressure gauge is set in syringe, if conduit 11 leaks, the pressure change in syringe, like this, by reading manometric registration, and carrying out corresponding conversion, namely can obtain the average leaked rate of conduit 11.
According to the leakage detection method for respirator 100 of the embodiment of the present invention, the average leaked rate of respirator 100 has nothing to do with the compliance of the conduit 11 adopted, only relevant with the leakage rate of leakage point, thus the leakage of respirator 100 can be detected simply, accurately, easily, the leakage detection method of this respirator 100 is practical, and is applicable to various types of respirator 100.
In one embodiment of the invention, the pressure in conduit 11 is recorded by pressure transducer, and the contiguous exhalation vents 81 of pressure transducer is arranged.Particularly, when proportioning valve 5 is to when testing injecting gas in pipeline, one end pressure of the contiguous air entry 72 of test pipeline is slightly floating, and the end pressure testing the contiguous exhalation vents 81 of pipeline is relatively stable, thus can the pressure-measuring-point 10 of pressure transducer be arranged on outlet valve 8, and contiguous exhalation vents 81 is arranged, thus can stablize and pressure in monitor test pipeline.Here, it should be noted that, pressure transducer and pressure-measuring-point 10 etc. have been well known to those skilled in the art, no longer describe in detail here.
Further, flow is recorded by flow sensor 6, and flow sensor 6 is located between proportioning valve 5 and relief valve 7.Particularly, flow sensor 6 has import 61 and outlet 62, the import 61 of flow sensor is linked together by the 3rd connection tube 92 with the outlet 52 of proportioning valve, the outlet 62 of flow sensor is linked together by the 4th connection tube 93 with the import 71 of relief valve, because flow sensor 6 is close to proportioning valve 5, thus the flow of the outlet 52 flowing through proportioning valve can be detected more exactly, namely flow into the gaseous mass in test pipeline.Here, it should be noted that the junction of flow sensor 6 and proportioning valve 5 and also may there is leakage with the junction of relief valve 7.
Again further, respirator 100 can also be connected with host computer (scheming not shown), thus can the process of whole detection be input in host computer by means such as programmings, the Leak Detection that host computer sends instruction control respirator 100 by Serial Port Line is carried out, collect feedback information, calculate and detect data, and testing result is presented on host computer, such as when testing result display respirator 100 leaks, host computer display detects unsuccessfully, when testing result display respirator 100 does not leak, host computer display detects successfully, thus conveniently detect and obtain testing result, and then improve detection efficiency.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (7)
1. for a leakage detection method for respirator, described respirator comprises source of the gas, proportioning valve, air entry and exhalation vents, and described proportioning valve is located between described source of the gas and described air entry, it is characterized in that, described leakage detection method comprises the following steps:
S1, described air entry to be communicated with by conduit with described exhalation vents;
S2, close described exhalation vents and open described proportioning valve to make described source of the gas to described conduit conveying gas, closing described proportioning valve when the pressure in described conduit reaches pressure predetermined value, starting timing and pressure in conduit described in Real-Time Monitoring;
S3, when the pressure in described conduit lower than opening described proportioning valve during described pressure predetermined value until the pressure in described conduit equals described pressure predetermined value, close described proportioning valve when timing duration equals duration predetermined value, obtain the flow of the described gas flowing through the outlet of described proportioning valve in described duration predetermined value;
S4, average leaked rate and slip standard value to be contrasted, when described average leaked rate is greater than described slip standard value, described respirator leaks, when described average leaked rate is less than or equal to described slip standard value, described respirator does not leak, and wherein said average leaked rate is the ratio of described flow in step S3 and described timing duration.
2. the leakage detection method for respirator according to claim 1, is characterized in that, in step S2, the pressure in described conduit is recorded by pressure transducer, and the contiguous described exhalation vents of described pressure transducer is arranged.
3. the leakage detection method for respirator according to claim 1, is characterized in that, is provided with relief valve between described proportioning valve and described air entry.
4. the leakage detection method for respirator according to claim 3, is characterized in that, in step S3, described flow is recorded by flow sensor, and described flow sensor is located between described proportioning valve and described relief valve.
5. the leakage detection method for respirator according to claim 1, is characterized in that, described pressure predetermined value is 50cmH
2o, described slip standard value is 3ml/s.
6. the leakage detection method for respirator according to claim 1, is characterized in that, described timing duration is 5s.
7. the leakage detection method for respirator according to claim 1, is characterized in that, described gas is the mist of air and oxygen.
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