CN105642038A - Efficiency detecting device and efficiency detecting method of filter core, and respirator - Google Patents
Efficiency detecting device and efficiency detecting method of filter core, and respirator Download PDFInfo
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- CN105642038A CN105642038A CN201511032084.8A CN201511032084A CN105642038A CN 105642038 A CN105642038 A CN 105642038A CN 201511032084 A CN201511032084 A CN 201511032084A CN 105642038 A CN105642038 A CN 105642038A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
- B01D46/0086—Filter condition indicators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
- A61M16/009—Removing used or expired gases or anaesthetic vapours
- A61M16/0093—Removing used or expired gases or anaesthetic vapours by adsorption, absorption or filtration
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/75—General characteristics of the apparatus with filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/18—Testing of filters, filter elements, sealings
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- Life Sciences & Earth Sciences (AREA)
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- Public Health (AREA)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention discloses an efficiency detecting device of a filter core. The filter core is arranged in an air passage. The efficiency detecting device is characterized by comprising a pressure measuring unit, a computing unit and a comparing unit, wherein the pressure measuring unit is used for collecting pressure data representing the efficiency of the filter core, and the pressure data are generated when airflow passes through the filter core and are associated with the filter core; the computing unit is used for computing according to the pressure data and reference data corresponding to the pressure data and obtaining relative data; the comparing unit is used for comparing the relative data with a specific threshold value corresponding to the relative data and obtaining a comparing result; the comparing result is used for representing the efficiency of the filter core. The invention also discloses an efficiency detecting method of the filter core, and a respirator. By using the efficiency detecting device or the efficiency detecting method of the filter core, disclosed by the invention, concentration information of particulate matters can be quantitatively and more accurately obtained through measuring specific pressure data, so that the filter efficiency of the filter core can be evaluated.
Description
Technical field
The present invention relates to respirator technical field, more specifically, it relates to the efficacy detection device of a kind of filter core, detection method and a kind of respirator.
Background technology
The impact of HUMAN HEALTH has been become the problem of World Focusing by current IAQ (indoor air quality). Along with living and the progressively improvement of working conditions, urban population is in time of indoor activity also in continuous prolongation, and therefore room air pollution is the important factor directly affecting HUMAN HEALTH.
When environment is subject to polluting, there is a large amount of dust in air, what suck when people breathe is not pure air but dust, and people's life and HUMAN HEALTH are had serious impact by these dust. People is when eupnea, respiratory tract can intercept major part particulate matter and foreign matter, but for wearing the patient of respirator, owing to the gaseous tension of respirator output is much larger than normal indoor gaseous tension, now carrying to the gas of patient through respiratory tract through respirator, the filtration of foreign matter in gas and cleaning action are significantly reduced by respiratory tract. Based on this reason, most of respirator all can enter gas port or outlet port installation air filter, this type of air filter mainly plays assisted respiartion road and filters and the function of foreign matter in clean air, and the part wherein played a major role is filtering element for air filter.
Filtering element for air filter can remove the solid particulate in air; tiny dust impurity in filtrated air or have the air of peculiar smell; can work in uncontaminated air environment by proterctive equipment; the cleaning of the gas that patient sucks can be ensured again; after fluid enters the filter core being equipped with certain specification filter screen; its impurity or peculiar smell are stopped, and cleaning stream thing is flowed out by filter core. The cleanliness factor that the air polluted reaches certain is made, to reaching the clean state required for meeting patient by the filtration of filter core.
Therefore, filter core is the core component of air filter. Filter core is most important to filter core to the filtering efficiency of foreign matter in air, the filtering efficiency height of filter core, then can be filtered out by the most of foreign matter in air, prevent from entering patient respiratory road, plays and filters and cleaning effect. But owing to design, operation or the reason of duration of service may cause the filter physical variation of filtration core bigger, even when filter core is excessively long for duration of service, filtering net attached to a large amount of foreign matters, the foreign matter of these attachments is brought into respiratory tract when ventilating, cause secondary pollution, thus not only do not play and filter and cleaning effect, form source of pollution on the contrary.
For these reasons, the assessment of the filtering efficiency of filter core is just seemed particularly important.In the prior art, but most of respirator producer all only provides filter core, it does not have fully take into account the risk that secondary pollution causes, therefore do not provide the function that filter core usefulness is pointed out. Or in other prior aries, although take into account this risk and function, but on equipment, just increasing the prompting that is regularly changed filter core, effective Monitoring and prevention cannot be accomplished. Simultaneously owing to the prompting mode of this type of filter core usefulness is not considered the objective environment for use of equipment, used the difference of frequency and use-pattern, therefore very easily cause when equipment sends filter element replacing prompting, filter core usefulness be reduced to already unavailable state or when equipment send filter element replacing point out time, filter core usefulness is also relatively high, it is not necessary to change. Cause the prompting of filter element replacing that user does not have actual reference significance.
Consequently, it is desirable to the detection device of the filtering efficiency of a kind of filter core and method, it is possible to differentiating when filter element filtering effect is reduced to a certain degree, the gas of Pollution protection is transferred patient respiratory road.
Summary of the invention
The present invention solves existing filter check device can not accurately judge that the problem of filter element filtering usefulness proposes.
According to the first aspect of the invention, provide the efficacy detection device of a kind of filter core, described filter core is arranged on air flue inside, described device comprises: pressure measurement cell, the pressure data characterizing filter core usefulness for gathering, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core; Calculate unit, calculate for the reference data according to described pressure data and corresponding to this pressure data, obtain relative data; Relatively unit, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.
Preferably, compare unit also for: when described comparative result represents that described relative data are greater than specific threshold, judge that current described filter core usefulness is as defective; When described comparative result represents that described relative data are not more than specific threshold, judge that current described filter core usefulness is as qualified.
Preferably, described pressure measurement cell, also for characterizing the pressure data of filter core usefulness with predetermined sample frequency collection; Described comparing unit, also N continuous time comparative result for obtaining when the pressure data according to sampling every time all judges that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective.
Preferably, the pressure data of described sign filter core usefulness is the weight data of filter core; Described pressure measurement cell comprises: weight measurement unit, and described filter core is placed in the surface measurements of described weight measurement unit, for gathering the weight data of described filter core; Described calculating unit, for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data.
Preferably, the pressure data of described sign filter core usefulness is the air pressure data along air flow line upper filter both sides; Described device also comprises the 2nd barometric surveying unit being arranged on and not filtering in path; Described measuring unit comprises: be arranged on the first barometric surveying unit filtered in path, for gathering the air pressure data filtering in path; Described 2nd barometric surveying unit, is supplied to described calculating unit for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path; Described calculating unit, for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
Preferably, described device also comprises: alarm unit, for judging that filter core usefulness is as the signal that gives the alarm time defective at relatively unit;And/or air-blower control unit, for judging that filter core usefulness is out of service as defective control blower fan at relatively unit.
According to the second aspect of the invention, it provides a kind of respirator, comprises device as described in the first aspect of the invention.
According to the third aspect of the invention we, providing the usefulness detection method of a kind of filter core, described filter core is arranged on air flue inside, comprising: measuring process, the pressure data characterizing filter core usefulness for gathering, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core; Calculation procedure, calculates for the reference data according to described pressure data and corresponding to this pressure data, obtains relative data; Comparison step, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.
Preferably, described comparison step also comprises: when described comparative result represents that described relative data are greater than specific threshold, judges that current described filter core usefulness is as defective; When described comparative result represents that described relative data are not more than specific threshold, judge that current described filter core usefulness is as qualified.
Preferably, described measuring process, also for gathering the pressure data of described sign filter core usefulness with predetermined sample frequency; For the secondary comparative result of N continuous when the pressure data acquisition according to sampling every time, described comparison step, also all judges that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective.
Preferably, the pressure data of described sign filter core usefulness is the weight data of filter core; Wherein: described measuring process, also for gathering the weight data of described filter core; Described calculation procedure, also for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data.
Preferably, the pressure data of described sign filter core usefulness is the air pressure data along air flow line upper filter both sides; Wherein: described measuring process, the air pressure data also filtering in path for gathering; Described method also comprises: reference data obtaining step, for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path; And described calculation procedure, also for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
The present inventor finds, prior art only can determine whether to need to change by length during the use that records filter core, this kind of record very rough, cannot accurately detect filter core usefulness and at all cannot for different environments for use, use frequency and using method provide pointed filter core usefulness detection and prompting. The present invention, by detecting the concrete pressure data relevant to filter core usefulness, quantitatively, more adequately to obtain the concentration information of particulate matter, thus evaluates the filtering efficiency of filter core, and then judges whether to need to change filter core. Therefore, the technical assignment that the present invention to be realized or technical problem to be solved are that those skilled in the art never expect or do not anticipate, therefore the present invention is a kind of new technical scheme.
By the detailed description of the exemplary embodiment of the present invention, the further feature of the present invention and advantage thereof being become clear referring to accompanying drawing.
Accompanying drawing explanation
Accompanying drawing that is in the description combined and that form a part for specification sheets shows embodiments of the invention, and illustrates that one is used from the principle explaining the present invention together with it.
Fig. 1 is the block diagram of the efficacy detection device of the filter core of the present invention.
Fig. 2 is the schema of the usefulness detection method of the filter core of the present invention.
Fig. 3 is the schematic diagram of an embodiment of the efficacy detection device of the filter core of the present invention.
Fig. 4 is the filter core usefulness of the present invention and the relation curve figure of weight difference.
Fig. 5 is the schematic diagram of another embodiment of the efficacy detection device of the filter core of the present invention.
Fig. 6 is the filter core usefulness of the present invention and the relation curve figure of pressure difference.
Embodiment
The various exemplary embodiment of the present invention is described in detail now with reference to accompanying drawing. It should be noted that: unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts set forth in these embodiments and step and numerical value do not limit the scope of the invention.
It is explanation property to the description only actually of at least one exemplary embodiment below, never as to any restriction of the present invention and application or use.
Detailed discussion may not be done, but in the appropriate case, described technology, method and equipment should be regarded as a part for specification sheets for the known technology of person of ordinary skill in the relevant, method and equipment.
In all examples with discussing shown here, any concrete value should be interpreted as being only exemplary, instead of as restriction. Therefore, other example of exemplary embodiment can have different values.
It should be noted that: similar label and letter accompanying drawing below represents similar item, therefore, once a certain Xiang Yi accompanying drawing is defined, then does not need it to be further discussed in accompanying drawing subsequently.
Fig. 1 is the block diagram of the efficacy detection device of filter core according to an embodiment of the invention.
As shown in Figure 1, the efficacy detection device of filter core according to embodiments of the present invention can directly apply among respirator equipment, such as, in medical breathing machine or home ventilator, typically this kind of respirator comprises power supply, main frame, air flue, the element such as humidification machine and mixing tank, in addition described respirator also may coordinate gas source in use, under the control of main frame, by air flue, the gas in gas source such as oxygen or empty oxygen gas mixture are supplied to user, the configuration of respirator provided herein is only example, the efficacy detection device of the filter core of the present invention is not limited only to above-mentioned application.
The efficacy detection device of filter core comprises pressure measurement cell 10, calculates unit 20 and compare unit 30 according to an embodiment of the invention, and wherein filter core is arranged on air flue inside. As mentioned above, it is necessary, described air flue can be respirator air flue.
Pressure measurement cell 10, for gathering the pressure data characterizing filter core usefulness, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core.
The filter core usefulness mentioned in this specification sheets and subsidiary claim, refers to the filter effect of filter core, and namely filter core can continue to intercept the ability of particulate matter, this ability adhered to filter core or the factor such as the total amount of particulate matter that exists relevant.
The pressure data characterizing filter core usefulness can be understood as the pressure data that with filter core be associated of air-flow by producing in described filter core process. Further, described pressure data can be various, and the air pressure data, the pressure that are such as associated with filter core weigh data/weight data, pressure data etc.Consider that the reason of the foundation that the pressure data that collection filter core is associated is used as sign filter core usefulness is, air flue has the characteristic for ventilating, filter core is arranged in air flue to bring the data variation being associated with pressure in gas is by filter core process, along with these data of use of filter core can change, also just can objective reaction filter core usefulness, therefore can carry out analyzing reaching the object of detection filter core usefulness for the pressure data that filter core is associated. More specifically, in an embodiment, described pressure data can be the heavy data (weight data) of pressure of filter core. When circulating direction at described air-flow is substantially tending towards horizontal direction, the heavy data of pressure gathering filter core are particularly advantageous, and this will be described in detail below. In another embodiment, described pressure data can be the air pressure data that filter core has filtered in path, has wherein filtered path and has referred to the direction along with air-flow, the path of the part air flue after filter element filtering, and this also will carry out detail below.
Described pressure measurement cell 10 can adopt different measuring sensors according to the difference of the pressure data of sign filter core usefulness, when measuring pressure weight/weight data, can be resistance strain type sensor, piezoelectric transducer, magneto-elastic transduce, capacity type probe or gyro gauge-type sensor, it is also possible to be the mutual arbitrary combination of these sensors. Such as, when measuring air pressure data, it is possible to being pressure transmitter, differential pressure pick-up, difference sensor or absolute pressure sensor, these all can be selected as required.
Calculate unit 20, calculate for the reference data according to described pressure data and corresponding to this pressure data, obtain relative data. Described calculating unit 20 need to utilize the reference data corresponding with the pressure data gathered to calculate described relative data. Herein, the implication of " reference data corresponding to this pressure data " refers to that the character with the pressure data gathered and type are consistent reference datas. Such as, when the weight data that the pressure data gathered is filter core, described reference data can be the initial weight data of filter core; When the pressure data gathered is the air pressure data having filtered path, described reference data can be the air pressure data not filtering path, and the described path that do not filter refers to the direction along with air-flow, without the path of the part air flue of filter element filtering; Similarly, when the pressure data that the pressure data gathered is other types that filter core is associated, it is possible to the data arranging the type are as with reference to data.
, it is possible to obtain, therefore described reference data can be a fixed value, the initial weight data of such as filter core; Can also be the data needing to be measured by other measuring sensor, such as, not filter the air pressure data of air flue. It is preferred, therefore, that described device can also comprise a storage unit (not shown), for storing described reference data value, this is particularly advantageously when described reference data is a fixed value. More preferably, described device can also comprise another reference data measuring unit, and for measuring reference data, this is particularly advantageously when reference data is and needs the changing value measured in real time.
Typically, described in be calculated as mathematic interpolation, namely calculate the difference between described pressure data and corresponding reference data, thus obtain relative data. Such as, when the initial weight data of the pressure data gathered to be the weight data of filter core, described reference data be filter core, namely described relative data are the weightening finish data of filter core; The pressure data gathered be filtered the air pressure data of path, described reference data be the air pressure data not filtering air flue time, namely described relative data are the air pressure differences of filter core both sides. Similarly, when the pressure data that the pressure data gathered is other types that filter core is associated, it is possible to obtain the difference data of the type is as relative data.
Relatively unit 30, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.Similarly, described " specific threshold corresponding to these relative data " implication refers to that the character with described relative data and type are consistent specific threshold. Such as, when the weightening finish data that described relative data are filter cores, it is possible to the index of weightening finish threshold value as filter core usefulness of filter core is set. When the air pressure difference that described relative data are filter core both sides, it is possible to the index of threshold pressure differential as filter core usefulness of filter core is set. Similarly, when the difference data that described relative data are other types, it is possible to the index of threshold value as filter core usefulness of the type data is set.
Here specific threshold can experience numerical value for pre-setting, this experience numerical value can change according to practical situation in actual applications. Form or curve can be formed by a large amount of experimental data, the process of forming curves can use method of interpolation or fitting process. After forming form or curve, it is possible to derive the data corresponding to it by the minimum usefulness reverse push that can tolerate and be used as preset data. Hereafter whenever measuring unit 10 measures data and obtains relative data by calculating unit 20, just these relative data and specific threshold are compared.
Especially, the described comparative result comparing unit 30 is generally and is greater than, is less than or equals. When described comparative result represents that described relative data are greater than specific threshold, compare unit 30 and judge that current described filter core usefulness is as defective; When described comparative result represents that described relative data are less than or equal to specific threshold, compare unit 30 and judge that current described filter core usefulness is as qualified. Certainly, due to the relative data of selection and the difference of specific threshold, decision condition possibility contrast, such as, when described comparative result represents that described relative data are less than specific threshold, compares unit 30 and judges that current described filter core usefulness is as defective; When described comparative result represents that described relative data are more than or equal to specific threshold, compare unit 30 and judge that current described filter core usefulness is as qualified. These all belong to the equivalent technical solutions of the present invention, are all included within protection scope of the present invention.
Generally speaking, single secondary sampling, calculating and comparative result may have randomness usually, and such as, when equipment is just opened, the environment in air flue is unstable, and the data of collection can not reflect truth; Or when accidental environmental change, may cause judging mistake, and the filter core usefulness result of determination provided according to the comparative result of single time can cause erroneous judgement usually, in order to avoid the generation of this problem, preferably, described pressure measurement cell 10, also for characterizing the pressure data of filter core usefulness with predetermined sample frequency collection; And described compare unit 30, also N continuous time comparative result for obtaining when the pressure data according to sampling every time all judges that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective. Wherein said N is predetermined positive integer, such as N=5. Continuous print N comparative result can advantageously be avoided single acquisition, calculate and compare the erroneous judgement caused, thus improves the accuracy of detection further.
Especially, described device can also comprise: alarm unit 60, for judging that filter core usefulness is as the signal that gives the alarm time defective at relatively unit 30, such that it is able to effectively point out user to change filter core; And/or air-blower control unit 70, for judging that filter core usefulness is out of service as defective control blower fan at relatively unit 30, thus the particulate matter that the filter core preventing low usefulness could not stop continues to propagate in air flue by blower fan, it is possible to the service efficiency of the degree of cleaning of lift technique, the equipment that economizes on resources, improves effectively.
According to an alternative embodiment of the invention, a kind of respirator is also provided, comprises the efficacy detection device of the filter core described in previous embodiment.
Below embodiments of the invention have been described by reference to the accompanying drawings, be directed in prior art only to provide regularly change that prompting can cause cannot the objective true usefulness of reaction filter core, cause and excessively change filter core and cause waste or excessively use filter core and cause the secondary pollution of air flue, according to the present embodiment, provide a kind of to filter core, the particularly accurate detection means of the filter core usefulness of respirator, thus conveniently obtain the truth of filter core usefulness.
The usefulness detection method of filter core according to another embodiment of the present invention is described below in conjunction with accompanying drawing. The present embodiment and a upper same or similar part of embodiment hereafter will repeat no more.
With reference to figure 2, as shown in the figure, the usefulness detection method of a kind of filter core, described filter core is arranged on air flue inside, described method comprises: measuring process S100, and for gathering the pressure data characterizing filter core usefulness, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core; Calculation procedure S200, calculates for the reference data according to described pressure data and corresponding to this pressure data, obtains relative data; Comparison step S300, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.
Wherein said step S300 also comprises: when described comparative result represents that described relative data are greater than specific threshold, judges that current described filter core usefulness is as defective; When described comparative result represents that described relative data are not more than specific threshold, judge that current described filter core usefulness is as qualified.
More particularly, it is seen that measuring process S100, also for characterizing the pressure data of filter core usefulness with predetermined sample frequency collection; And described comparison step S300, also all judge that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective for the secondary comparative result of N continuous when the pressure data acquisition according to sampling every time.
Especially, the pressure data of wherein said sign filter core usefulness is the weight data of filter core; Wherein: described measuring process S100, also for gathering the weight data of described filter core; Described calculation procedure S200, also for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data.
Especially, the pressure data of described sign filter core usefulness is the air pressure data along air flow line upper filter both sides; Wherein: described measuring process S100, the air pressure data also filtering in path for gathering; Described method also comprises: reference data obtaining step (not shown), for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path; And described calculation procedure S200, also for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
Below in conjunction with concrete example, embodiments of the invention are described in detail.
<example 1>
In the present example, the pressure data characterizing filter core usefulness is the weight data of filter core.
According to this example, as shown in Figure 3, described pressure measurement cell is weight measurement unit 12.
Filter core 50 is placed in the surface measurements of weight measurement unit 12, for gathering the weight information of filter core 50. When the air flue that described air flue is basic horizontal, be conducive to most the placement of described weight measurement unit 12, now namely filter core 50 is positioned in the measuring surface of described weight measurement unit 12 in its natural state, and the setting of weight measurement unit 12 can not make the filtration area of filter core be reduced by unfavorable, thus filtration efficiency can not be affected.
Weight measurement unit 12 can be resistance strain type sensor, piezoelectric transducer, magneto-elastic transduce, capacity type probe or gyro gauge-type sensor, it is also possible to is the mutual arbitrary combination of these sensors.
Described calculating unit, for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data. The initial weight of described filter core can be stored among a storage unit (not shown), and described storage can be preset at when equipment dispatches from the factory in described storage unit, it is also possible to artificially inputs by serviceman or user subsequently and stores.
Can be understood as, filter core 50 has certain initial weight value in the state not used, in use for some time, the particulate matter of a part can be adsorbed, cause weight that small increase occurs, the present embodiment judges the filtering efficiency of filter core by detecting the increase of filter core changes in weight value, namely when weight difference exceedes specific threshold, it is possible to understand that need to change for filter core 50. Described specific threshold can experience numerical value for pre-setting, this experience numerical value can change according to practical situation in actual applications. Form or curve can be formed by a large amount of experimental data, the process of forming curves can use method of interpolation or fitting process. After forming form or curve, it is possible to derive the data corresponding to it by the minimum usefulness reverse push that can tolerate and be used as specific threshold.
Such as, it is possible to the specific threshold arranging weight difference is 1 �� g, filter core at a time increases weight 1 �� g relative to original state, namely weight difference is 1 �� g, being learnt by inquiry experimental data form, the usefulness that now filter core is corresponding is lower than predetermined usefulness, it is necessary to change.
As shown in Figure 4, described graphic representation can be drawn the relation curve figure of the filtering efficiency of weight difference and filter core by fitting process. As can be seen from Figure 4, this relation object is similar to inversely prroportional relationship, and weight difference is more big, and the filtering efficiency of filter core 50 is more little, when this weight difference is reduced to a stable value, it is possible to understand that need to change for filter core 50.
<example 2>
In the present example, the pressure data characterizing filter core usefulness is the air pressure data along air flow line upper filter both sides.
According to this example, as shown in Figure 5, described pressure measurement cell is the first barometric surveying unit 14, is arranged on the first barometric surveying unit filtered in path, for gathering the air pressure data filtering in path.
Described device also comprises the 2nd barometric surveying unit 16 being arranged on and not filtering in path, is supplied to described calculating unit for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path.
Described calculating unit 20, for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
Although in the present example, have employed two barometric surveying unit (14,16), but the those of ordinary skill of this area will be appreciated that, prior art exists some sensors itself namely there are two measuring units, therefore a sensor can be only used just can to measure pressure difference value, but other sensors are a measuring unit only, it is thus desirable to pressure difference value just can be measured by two same type of sensor, these all can be selected as required, can not be construed as limiting the invention.
First barometric surveying unit 14 and the 2nd barometric surveying unit 16 can be differential pressure pick-up, difference sensor or absolute pressure sensor.
As shown in Figure 6, described graphic representation can be drawn the relation curve figure of the filtering efficiency of air pressure difference and filter core by fitting process. As can be seen from Figure 6, this relation object is similar to inversely prroportional relationship, and pressure difference value is relevant with multiple factor, such as filter factor of speed air flow, airway diameter, inlet pipe and escape pipe length, gas density, filter core etc. Generally it can be thought that, pressure difference is more big, then the filtering efficiency of filter core is more little, when this air pressure difference is reduced to a stable value (specific threshold), it is possible to understand that need to change for filter core 50.
Such as, the difference of the pressure that the first barometric surveying unit and the 2nd barometric surveying unit measure filter core 50 both sides is 0.003N, is learnt by inquiry experimental data form, and now corresponding filter core usefulness is lower than predetermined threshold value, and filter core needs to change.
Aforesaid device can be included in the middle of respirator. In actual applications, it is necessary to using the patient of respirator often to require higher to Air quality, therefore the efficacy detection device of filter core provided by the invention can preferably be applied in the middle of respirator.
It will be appreciated by those skilled in the art that, it is possible to realize said apparatus by various mode. Such as, it is possible to realize said apparatus by instruction configuration processor. Such as, it is possible to instruction is stored in ROM, and when starting the device, instruction is read from ROM programming device realizes said apparatus. Such as, it is possible to said apparatus is cured in dedicated devices (such as ASIC). Said apparatus can be divided into separate unit, or they can be combined realization. Said apparatus can be realized by the one in above-mentioned various implementation, or can be realized by the combination of two or more modes in above-mentioned various implementation. To those skilled in the art, these enforcement modes are all of equal value.
Well known to a person skilled in the art and it is, along with the such as development of the electronic information technology of large-scale integrated circuit technology and the trend of hardware and software, will clearly divide computer system soft and hardware boundary and seem to compare and difficult for. Because any operation can realize by software, it is also possible to by realizing. The execution of any instruction can be completed by hardware, can also complete by software equally. A certain machine function is adopted to hardware implementations or software implement scheme, depend on the Non-technical factor such as price, speed, reliability, storage capacity, change cycle. Therefore, for the those of ordinary skill of electronic information technical field, the mode more directly and clearly describing a technical scheme is each operation described in the program. When knowing the operation to be performed, those skilled in the art can based on the product that the consideration of described Non-technical factor is directly designed expectation.
Although being described in detail by some specific embodiments of the present invention by example, but the technician of this area is it is to be understood that above example is only to be described, instead of in order to limit the scope of the invention. The technician of this area is it is to be understood that can without departing from the scope and spirit of the present invention, modify to above embodiment. The scope of the present invention is limited by claims.
Claims (12)
1. an efficacy detection device for filter core, described filter core is arranged on air flue inside, it is characterised in that, described device comprises:
Pressure measurement cell, for gathering the pressure data characterizing filter core usefulness, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core;
Calculate unit, calculate for the reference data according to described pressure data and corresponding to this pressure data, obtain relative data;
Relatively unit, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.
2. device according to claim 1, it is characterised in that, described compare unit also for:
When described comparative result represents that described relative data are greater than specific threshold, judge that current described filter core usefulness is as defective;
When described comparative result represents that described relative data are less than or equal to specific threshold, judge that current described filter core usefulness is as qualified.
3. device according to claim 1 and 2, it is characterised in that,
Described pressure measurement cell, also for gathering the pressure data of described sign filter core usefulness with predetermined sample frequency;
Described comparing unit, also N continuous time comparative result for obtaining when the pressure data according to sampling every time all judges that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective.
4. device according to claim 1, it is characterised in that, the pressure data of wherein said sign filter core usefulness is the weight data of filter core;
Described pressure measurement cell comprises: weight measurement unit, and described filter core is placed in the surface measurements of described weight measurement unit, for gathering the weight data of described filter core;
Described calculating unit, for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data.
5. device according to claim 1, it is characterised in that, the pressure data of wherein said sign filter core usefulness is the air pressure data along air flow line upper filter both sides;
Described device also comprises the 2nd barometric surveying unit being arranged on and not filtering in path;
Described pressure measurement cell comprises: be arranged on the first barometric surveying unit filtered in path, for gathering the air pressure data filtering in path;
Described 2nd barometric surveying unit, is supplied to described calculating unit for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path;
Described calculating unit, for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
6. device according to claim 3, it is characterised in that, described device also comprises:
At relatively unit, alarm unit, for judging that filter core usefulness is as the signal that gives the alarm time defective; And/or
At relatively unit, air-blower control unit, for judging that filter core usefulness is out of service as defective control blower fan.
7. a respirator, it is characterised in that, comprise such as device as described in any one in claim 1 to 6.
8. a usefulness detection method for filter core, described filter core is arranged on air flue inside, it is characterised in that, comprising:
Measuring process, for gathering the pressure data characterizing filter core usefulness, described pressure data is the pressure data associated with filter core that air-flow is caused by described filter core;
Calculation procedure, calculates for the reference data according to described pressure data and corresponding to this pressure data, obtains relative data;
Comparison step, for comparing to obtain comparative result with the specific threshold corresponding to these relative data by described relative data, described comparative result is for representing described filter core usefulness.
9. method according to claim 8, it is characterised in that, described comparison step also comprises:
When described comparative result represents that described relative data are greater than specific threshold, judge that current described filter core usefulness is as defective;
When described comparative result represents that described relative data are less than or equal specific threshold, judge that current described filter core usefulness is as qualified.
10. method according to claim 8 or claim 9, it is characterised in that, wherein:
Described measuring process, also for gathering the pressure data of described sign filter core usefulness with predetermined sample frequency;
For the secondary comparative result of N continuous when the pressure data acquisition according to sampling every time, described comparison step, also all judges that current filter core usefulness is as, time defective, judging that described filter core usefulness is as defective.
11. methods according to claim 8, it is characterised in that, the pressure data of wherein said sign filter core usefulness is the weight data of filter core; Wherein:
Described measuring process, also for gathering the weight data of described filter core;
Described calculation procedure, also for using the initial weight of filter core as with reference to data, according to the weight difference of the weight data of described filter core and described filter core initial Weight computation filter core as relative data.
12. methods according to claim 8, it is characterised in that, the pressure data of wherein said sign filter core usefulness is the air pressure data along air flow line upper filter both sides; Wherein:
Described measuring process, the air pressure data also filtering in path for gathering;
Described method also comprises:
Reference data obtaining step, for gathering the air pressure data not filtering in path as the reference data corresponding to the described air pressure data filtered in path; And
Described calculation procedure, also for calculate filter core both sides according to the described air pressure data filtered in path and described reference data air pressure difference as relative data.
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