CN201477027U - Air filter material filter efficiency detector - Google Patents
Air filter material filter efficiency detector Download PDFInfo
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- CN201477027U CN201477027U CN2009203083918U CN200920308391U CN201477027U CN 201477027 U CN201477027 U CN 201477027U CN 2009203083918 U CN2009203083918 U CN 2009203083918U CN 200920308391 U CN200920308391 U CN 200920308391U CN 201477027 U CN201477027 U CN 201477027U
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- cabinet
- sampling
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Abstract
The utility model provides an air filter material filter efficiency detector, which can solve the problems that the inconformity of sampling conditions affects the accuracy of detection results in the prior art, and inspectors are possible to get risk. The technical proposal is that the air filter material filter efficiency detector comprises a cabinet portion, a double-air passage contrast sampling portion and a support portion, wherein the double-air passage contrast sampling portion is provided with two output sampling air passages, samples of two samplers can be simultaneously contrasted from one aerosol chamber through two sets of the same air passages, the sampling conditions of two contrast samplings are guaranteed to be the same, and the detection results are accurate and reliable. The double-air passage contrast sampling portion is arranged in a negative pressure cabinet, the safety protection of experiment operators can be fully considered, and the method that all test appliances are integrated into the negative pressure cabinet similar to a III-grade safety cabinet can effectively separate inspectors and noxious substances such as bacteria to protect inspectors.
Description
Technical field
The utility model relates to the checkout equipment of air filting material, is specifically related to a kind of checkout equipment of air filting material particle filtration efficiency, promptly a kind of filtering efficiency detector of air filter materials.
Background technology
Use increasing air filting material in our medical treatment and the activity in production now, as medical surgical mouth mask, gauze etc., its filtration efficiency need be tested with the special inspection machine and the method for inspection.Detect according to the regulation of " appendix B bacterial filtration efficiency (BFE) test method " in " technical requirement of YY0469-2004 medical surgical mouth mask " as the bacterial filtration efficiency of China's medical surgical mouth mask and to carry out, wherein the staphylococcus aureus method is most widely used.This detection method can detect the bacterial filtration efficiency of medical surgical mouth mask, but because the restriction of checkout equipment makes the accuracy of testing result be subjected to time effects.Because its testing process is to utilize a cover sampling gas circuit, earlier do not add mouth mask and adopt sample one time at the sampling thief end, add to muzzle at the sampling thief end then and adopt sample one time, the sample of double sampling is cultivated counting, determine the filtration efficiency of mouth mask by the colony counts that compares twice sample; Because double sampling does not carry out simultaneously, the sampling condition of double sampling sample can be not in full accord, influenced the accuracy of testing result.In addition, testing process has been used staphylococcus aureus, and checkout equipment can not provide protection to the testing staff, and the testing staff needs wear protective gear to operate, and wastes time and energy, and has certain danger.
The air filting material that other adopts similar approach to detect, also there is same problem in its testing process.How to solve the problems of the technologies described above, then be the problem that the utility model faced.
Summary of the invention
The utility model provides a kind of filtering efficiency detector of air filter materials, can the cause danger problem of possibility of testing result accuracy and testing staff that influences because of sampling condition is inconsistent that can solve that prior art exists.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
The utility model provides a kind of detector of air filting material filtration efficiency, (one of them sampling thief front end does not add filtering material can be from same aerosol chamber to carry out the contrast sampling of two sampling thiefs simultaneously by the identical gas circuit of two covers, another sampling thief front end adds filtering material), the sampling condition that has guaranteed two contrast samplings is identical, and testing result accurately and reliably; Aspect personal protection,, nuisances such as testing staff and bacterium are effectively isolated, for the testing staff provides protection then by the method in the negative pressure cabinet that all test equipments is integrated into a similar III level security cabinet.
A kind of filtering efficiency detector of air filter materials comprises the cabinet part, two gas circuit contrast sampling section and holder part, and described pair of gas circuit contrast sampling section is provided with two output sampling gas circuits, can carry out two contrast samplings simultaneously.
Further, described pair of gas circuit contrast sampling section also comprises main gas circuit, be connected with compressor, four-way, air-capacitor, water-separating gas filter, orifice metre, high efficiency particulate air filter, sprayer by pipeline successively on the described main gas circuit, described sprayer connects the aerosol chamber, also connects peristaltic pump and vortex mixer on the sprayer;
Lower end, described aerosol chamber connects two sampling heads simultaneously and forms described two output sampling gas circuits, and each bar output sampling gas circuit comprises sampling head, high efficiency particulate air filter, two-way valve, orifice metre, water-separating gas filter, air-capacitor, the sampling pump by pipeline connection successively.
Further, the four-way on the described main gas circuit also connects pressure switch and variable valve.
In order to protect the testing staff, make it can causing danger property, described pair of gas circuit contrast sampling section is positioned at the negative pressure cabinet.
Further, described negative pressure cabinet comprises the cabinet of sealing, the cabinet top has some air admission holes, at the corresponding described air inlet position of described cabinet top outer high efficiency particulate air filter is set, described bottom of cabinet bulk is provided with vent port, described vent port place connects a blower fan by seal for pipe joints, and exhaust outlet place, blower fan upper end is provided with high efficiency particulate air filter.
High efficiency particulate air filter is sealedly connected on the cabinet top, and cabinet has some air admission holes at this position, and the outer gas of cabinet enters cabinet after high efficiency particulate air filter filters; Cabinet is the cube that a single face opens wide, and opens wide towards the one side of glass door, and when glass door was closed, glass door and cabinet were for being sealed and matched, and other parts seal fully except that air admission hole, exhausr port; The exhausr port of blower and pipeline and bottom of cabinet bulk is tightly connected, and the gas in the cabinet is outwards taken out, and makes to be in negative pressure state in the cabinet; The gas that blower fan is extracted out is discharged to the cabinet outside after high efficiency particulate air filter filters.Negative pressure in the cabinet is detected by a differential pressure pick-up that is positioned on the circuit board.Blower fan continues to bleed from cabinet in the testing process, makes cabinet remain on negative pressure state, and the bacterium that is for experiment in the cabinet etc. is unlikely to overflow, protection testing staff's personal safety.
In technique scheme of the present utility model, also have following technical characterictic: two test tubes are housed on the described vortex mixer, and one of them supplies with test tube for spraying liquid, and another reclaims test tube for the spraying waste liquid.
In technique scheme of the present utility model, also have following technical characterictic: described negative pressure cabinet part with and each parts of inner two gas circuits contrast sampling section be arranged at described cabinet partly in, described holder part supports whole described cabinet part.Holder part is a metal support, is positioned at the instrument bottom, in order to support the instrument complete machine.
In the technical solution of the utility model, also have following technical characterictic: described crate part branch comprises shell, and cover top portion is provided with air intake opening and exhausr port, and the top of described air intake opening and exhausr port is provided with dust cover.
The testing staff observes and the interior sampling head of operation negative pressure cabinet for convenience, and described cabinet front is provided with glass door, and described glass door is provided with two gloves.
In technique scheme of the present utility model, also have following technical characterictic: the described cabinet outside connects a differential pressure pick-up, also is provided with control panel in described cabinet one side, and the detected value of described differential pressure pick-up is presented on the described control panel.The peripheral hardware USB interface is supported the USB flash disk data conversion storage.
Spraying liquid is deposited in bacterium liquid and is supplied with in vitro, and vortex mixer moves the spraying liquid mixing, and peristaltic pump is extracted spraying liquid out and injected sprayer; The gas that is drawn into by compressor enters sprayer through four-way, air-capacitor, water-separating gas filter, orifice metre, high efficiency particulate air filter after filtering, and fully mixes with spraying liquid in the sprayer, sprays with vaporific aerosol form to enter the aerosol chamber; Spraying liquid residual in the sprayer reclaims the test tube withdrawal by waste liquid.The input flow rate of compressor is less than the delivery rate of two-way sampling pump, and the I/O traffic balance needs to add supplemental air flow to the aerosol chamber in the aerosol chamber in order to keep; Supplemental air flow one tunnel enters the aerosol chamber after high efficiency particulate air filter filters, another route variable valve enters after high efficiency particulate air filter filters and enters the aerosol chamber.The gasoloid that enters by sprayer in the aerosol chamber be divided into A, the output of B two-way after supplemental air flow is mixed, the two-way flow is identical, is respectively applied for the contrast sampling of two sampling thiefs, one of them sampling thief does not add filtering material, another sampling thief adds filtering material.A road output gas circuit is in sampling process, connect with pipeline between aerosol chamber, sampling head, high efficiency particulate air filter, two-way valve, orifice metre, water-separating gas filter, air-capacitor and the sampling pump, by the gas of aerosol chamber's output, after sampling head, high efficiency particulate air filter, two-way valve, orifice metre, water-separating gas filter, air-capacitor, extract out by sampling pump; Use sample if having in the gas to detect, then can be sampled head and catch.When output gas circuit in A road is not worked but still is needed to keep gas circuit unimpeded at sampling head, the aerosol chamber is by connecting with pipeline between another high efficiency particulate air filter and another two-way valve and orifice metre, water-separating gas filter, air-capacitor and the sampling pump, by the gas of aerosol chamber's output, extract out by sampling pump after process orifice metre, water-separating gas filter, the air-capacitor again through another high efficiency particulate air filter and another two-way valve.B road output gas circuit and A road are identical.Remain in the aerosol chamber in the certain negative pressure scope, detect by a differential pressure pick-up that is positioned on the circuit board.
Negative pressure cabinet part provides negative pressure protection, two gas circuit contrast sampling section can carry out two contrast samplings simultaneously in testing process, and negative pressure cabinet part and two each parts of gas circuit contrast sampling section are fixed or are positioned in the cabinet, and holder part is used to support complete machine.
The crate part branch comprises shell, two dust cover, glass door, two gloves, control panel and some cover plates.The position that two dust cover are installed on shell has some air holes, is used for inside and outside ventilation and uses; Two gloves are installed on the glass door, and the testing staff can operate the sampling of instrument internal is first-class by gloves; Touch-screen and some control buttons are housed on the control panel, are used for the control instrument operation; Cover plate is used for closure.
The negative pressure cabinet partly comprises high efficiency particulate air filter, cabinet, blower fan.One of them high efficiency particulate air filter is sealedly connected on the cabinet top, and cabinet has some air admission holes at this position, and the outer gas of cabinet enters cabinet after high efficiency particulate air filter filters; Cabinet is the cube that a single face opens wide, and opens wide towards the one side of glass door, and when glass door was closed, glass door and cabinet were for being sealed and matched, and other parts seal fully except that air admission hole, exhausr port; The exhausr port of blower and pipeline and bottom of cabinet bulk is tightly connected, and the gas in the cabinet is outwards taken out, and makes to be in negative pressure state in the cabinet; The gas that blower fan is extracted out is discharged to the cabinet outside after another high efficiency particulate air filter filters.Negative pressure in the cabinet is detected by a differential pressure pick-up that is positioned on the circuit board.Blower fan continues to bleed from cabinet in the testing process, makes cabinet remain on negative pressure state, and the bacterium that is for experiment in the cabinet etc. is unlikely to overflow, protection testing staff's personal safety.
Compared with prior art, advantage of the present utility model and good effect are:
The utility model adopts design philosophy and manufacturing technology advanced in the same industry in the world, can use corresponding spraying liquid and sampling head according to the difference of filtering material, peristaltic pump, compressor, sampling pump flow can be regulated as requested, compare with existing checkout equipment, and its advantage is:
1, designed two output sampling gas circuits, two sampling thiefs can be sampled simultaneously, eliminate the error that causes because of different time gasoloid generation concentration change.
2, designed the negative pressure cabinet system, in the negative pressure cabinet, carried out required operation,, gasoloid can not leaked, protection testing staff's personal safety to the laboratory by keeping the negative pressure in the negative pressure cabinet.
3, gasoloid generation systems of the present utility model increases water-separating gas filter, high efficiency particulate air filter on the basis of satisfying pressure and flow, and spray gas is purified.The spraying liquid flow of gasoloid generation systems can be controlled accurately by peristaltic pump, makes the aerosol concentration of generation stable.Make-up gas is also filtered through high efficiency particulate air filter.Accurate design and control by to aerosol chamber's structure, gasoloid generation flow, make-up gas flow, delivery rate fully mix the gasoloid in the aerosol chamber.
4, adopt Control System of Microcomputer to coordinate the work of control negative pressure cabinet system, two gas circuit contrast sampling system, sampling flow can be set according to different filtering materials, and duty is shown in real time, and whole surveying work is finished automatically.
5, peripheral hardware USB interface is supported the USB flash disk data conversion storage.
Description of drawings
Fig. 1 is a front view of the present utility model, and on behalf of gas circuit, dotted line connect (or spraying liquid passage);
Fig. 2 is a cut-open view of the present utility model, arrow indication gas flow;
Fig. 3 is a rear view of the present utility model, and on behalf of gas circuit, dotted line connect;
Fig. 4 is a sampling pneumatic diagram of the present utility model, and arrow indication gas or spraying liquid flow to;
Symbol among the figure and explanation thereof:
1, cabinet part; 1-1, shell; 1-2, dust cover; 1-3, glass door; 1-4, gloves; 1-5, control panel; 1-6, cover plate;
2, negative pressure cabinet part; 2-1, high efficiency particulate air filter; 2-2, cabinet; 2-3, blower fan; 2-4, high efficiency particulate air filter; 2-5, air intake opening; 2-6, exhausr port;
3, two gas circuit contrast sampling section; 3-1, compressor; 3-2, four-way; 3-3, air-capacitor; 3-4, pressure switch; 3-5, variable valve I; 3-6, water-separating gas filter; 3-7, orifice metre; 3-8, high efficiency particulate air filter; 3-9, sprayer; 3-10, vortex mixer; 3-11, test tube; 3-12, peristaltic pump; 3-13, high efficiency particulate air filter; 3-14, variable valve; 3-15, high efficiency particulate air filter; 3-16, aerosol chamber; 3-17, sampling head; 3-18, two-way valve; 3-19, sampling pump; 3-20, differential pressure pick-up;
4, holder part.
Embodiment
Be described as follows with principle of work with regard to the structure composition that the utility model is applied to medical surgical mouth mask bacterial filtration efficiency detection embodiment below in conjunction with accompanying drawing:
Consult Fig. 1, Fig. 2, Fig. 3, the crate part branch comprises shell 1-1, two dust cover 1-2, glass door 1-3, two gloves 1-4, control panel 1-5 and some cover plate 1-6.The position that two dust cover 1-2 are installed on shell 1-1 has some air holes, and one of them dust cover 1-2 is used for air inlet, and another dust cover 1-2 is used for exhaust; Two gloves 1-4 are installed on the glass door 1-3, between gloves 1-4 and the glass door 1-3 sealing air tight, the testing staff 1-4 that can put on one's gloves operates; Control panel 1-5 is used for the control instrument operation; Cover plate 1-6 is used for closure 1-1.
Consult Fig. 2, negative pressure cabinet part 2 comprises high efficiency particulate air filter (air inlet) 2-1, cabinet 2-2, blower fan 2-3, high efficiency particulate air filter (exhaust) 2-4.High efficiency particulate air filter 2-1 is sealedly connected on cabinet 2-2 top, and cabinet 2-2 has some air admission hole 2-5 at this position; Cabinet 2-2 opens wide towards the one side of glass door 1-3, and when glass door 1-3 closed, glass door 1-3 and cabinet 2-2 were for being sealed and matched; The air intake opening of blower fan 2-3 is tightly connected by the exhausr port 2-6 of pipeline and cabinet 2-2 bottom, and the exhausr port of blower fan 2-3 is tightly connected by pipeline and high efficiency particulate air filter 2-4.Blower fan 2-3 starts in the testing process, and extraneous gas enters among the cabinet 2-2 after being filtered by high efficiency particulate air filter 2-1, is taken away after high efficiency particulate air filter 2-4 filters by blower fan 2-3 and discharges, and makes cabinet 2-2 remain on negative pressure state.Negative pressure in the cabinet 2-2 is detected by a differential pressure pick-up 3-20 who is positioned on the circuit board, detected negative pressure signal is sent to circuit board, circuit board makes the interior negative pressure of cabinet 2-2 reach the regulation requirement according to the duty of the negative pressure signal adjustment blower fan 2-3 that receives.
Consult Fig. 1, Fig. 2, Fig. 4, two gas circuits contrast sampling section 3 comprise compressor 3-1, four-way 3-2,3 air-capacitor 3-3, pressure switch 3-4, variable valve 3-5,3 water-separating gas filter 3-6,3 orifice metre 3-7,5 high efficiency particulate air filter 3-8, sprayer 3-9, vortex mixer 3-10,2 test tube 3-11, peristaltic pump 3-12, high efficiency particulate air filter 3-13, variable valve 3-14, high efficiency particulate air filter 3-15, the 3-16 of aerosol chamber, 2 Anderson sampling head 3-17,4 two-way valve 3-18 and 2 sampling pump 3-19.
Bacterium liquid is housed on the vortex mixer 3-10 supplies with test tube 3-11, bacterium liquid is supplied with in the test tube 3-11 and is placed with bacterial suspension, and vortex mixer 3-10 moves the bacterial suspension mixing, and peristaltic pump 3-12 extracts bacterial suspension out and injects sprayer 3-9; The gas that is drawn into by compressor 3-1, behind four-way 3-2, air-capacitor 3-3, water-separating gas filter 3-6, orifice metre 3-7, high efficiency particulate air filter 3-8, enter sprayer 3-9, enter the 3-16 of aerosol chamber with atomized spray after being mixed into gasoloid with bacterial suspension in the sprayer 3-9; Bacterial suspension residual in the sprayer 3-9 is reclaimed test tube 3-11 withdrawal by the waste liquid on the vortex mixer 3-10.Wherein four-way 3-2 connects compressor 3-1, air-capacitor 3-3, pressure switch 3-4, variable valve 3-5 respectively, and gas is drawn into by compressor 3-1 after four-way 3-2 enters air-capacitor 3-3; Variable valve 3-5 discharges unnecessary gas, and the gas flow of discharge can be regulated, and satisfies the required flow of sprayer 3-9 spraying; Pressure switch 3-4 and compressor 3-1 circuit are connected, and pressure switch 3-4 disconnects compressor 3-1 circuit when gas circuit pressure is excessive, stop the protection of compressor 3-1 action realization to the gas circuit element.The supplemental air flow one tunnel of the 3-16 of aerosol chamber enters the 3-16 of aerosol chamber after high efficiency particulate air filter 3-13 filters, another route variable valve 3-14 enters after high efficiency particulate air filter 3-15 filters and enters the 3-16 of aerosol chamber; Variable valve 3-14 scalable enters the flow of gas, keeps the balance of input and output gas flow in the 3-16 of aerosol chamber.In the 3-16 of aerosol chamber gasoloid be divided into A after supplemental air flow is mixed, the B two-way is exported, the two-way flow is identical; A road gas in sampling process is exported by the 3-16 of aerosol chamber, behind Anderson sampling head 3-17, high efficiency particulate air filter 3-8, two-way valve 3-18, orifice metre 3-7, water-separating gas filter 3-6, air-capacitor 3-3, extract out by sampling pump 3-19, use sample if having in the gas to detect, then can be caught by the agar in the double dish in the sampling head 3-17 of Anderson; Gas is extracted out by sampling pump 3-19 behind process orifice metre 3-7, water-separating gas filter 3-6, the air-capacitor 3-3 through another Type B high efficiency particulate air filter 3-8 and another two-way valve 3-18 by the 3-16 of aerosol chamber output again when do not work but still need to keep gas circuit unimpeded at Anderson sampling head 3-17 in the A road; B road output gas circuit and A road are identical.The 3-16 planted agent of aerosol chamber remains in the certain negative pressure scope, detect by a differential pressure pick-up 3-20 who is positioned on the circuit board, detected negative pressure signal is sent to circuit board, circuit board makes the interior negative pressure of the 3-16 of aerosol chamber reach the regulation requirement according to the duty of the negative pressure signal Adjustment System that receives.
Consult Fig. 1, holder part 4 is metal supports, plays the support complete machine.
Application example main performance index of the present utility model meets " appendix B bacterial filtration efficiency (BFE) test method " the B.1.1.1 requirement of test apparatus in " technical requirement of YY0469-2004 medical surgical mouth mask ", the enough pairing comparision of energy detect the bacterial filtration efficiency of medical surgical mouth mask, carry out the contrast sampling of two sampling thiefs simultaneously by the identical gas circuit of two covers from same aerosol chamber, the error that elimination causes because of different time gasoloid generation concentration change, testing result accurately and reliably.And all test equipments are integrated in the negative pressure cabinet, testing staff and bacterium are effectively isolated, safe and reliable.Adopt the work of microcomputer automatic control negative pressure cabinet system, two gas circuit contrast sampling system, simplified manually-operated.
Above-mentioned application example is one of embodiment of the present utility model, the utility model also has other embodiment under the constant situation of basic structure and principle of work, as adjusting peristaltic pump, compressor, sampling pump flow simultaneously and can be used for other air filting material filtration efficiency and detect, do not exceed so that example is described by using different spraying liquids, sampling head instead.
The above, it only is preferred embodiment of the present utility model, be not to be the restriction of the utility model being made other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment did, still belongs to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (10)
1. filtering efficiency detector of air filter materials is characterized in that: comprise the cabinet part, and two gas circuits contrast sampling section and holder part, described pair of gas circuit contrast sampling section is provided with two output sampling gas circuits, can carry out two contrast samplings simultaneously.
2. filtration efficiency detector according to claim 1, it is characterized in that: described pair of gas circuit contrast sampling section also comprises main gas circuit, be connected with compressor, four-way, air-capacitor, water-separating gas filter, orifice metre, high efficiency particulate air filter, sprayer by pipeline successively on the described main gas circuit, described sprayer connects the aerosol chamber, also connects peristaltic pump and vortex mixer on the sprayer;
Lower end, described aerosol chamber connects two sampling heads simultaneously and forms described two output sampling gas circuits, and each bar output sampling gas circuit comprises sampling head, high efficiency particulate air filter, two-way valve, orifice metre, water-separating gas filter, air-capacitor, the sampling pump by pipeline connection successively.
3. filtration efficiency detector according to claim 2 is characterized in that: the four-way on the described main gas circuit also connects pressure switch and variable valve.
4. filtration efficiency detector according to claim 1 and 2 is characterized in that: described pair of gas circuit contrast sampling section is positioned at the negative pressure cabinet.
5. filtration efficiency detector according to claim 4, it is characterized in that: described negative pressure cabinet comprises the cabinet of sealing, the cabinet top has some air admission holes, at the corresponding described air inlet position of described cabinet top outer high efficiency particulate air filter is set, described bottom of cabinet bulk is provided with vent port, described vent port place connects a blower fan by seal for pipe joints, and exhaust outlet place, blower fan upper end is provided with high efficiency particulate air filter.
6. filtration efficiency detector according to claim 2 is characterized in that: two test tubes are housed on the described vortex mixer, and one of them supplies with test tube for spraying liquid, and another reclaims test tube for the spraying waste liquid.
7. filtration efficiency detector according to claim 5 is characterized in that: described negative pressure cabinet part with and each parts of inner two gas circuits contrast sampling section be arranged at described cabinet partly in, described holder part supports whole described cabinet part.
8. filtration efficiency detector according to claim 7 is characterized in that: described crate part branch comprises shell, and cover top portion is provided with air intake opening and exhausr port, and the top of described air intake opening and exhausr port is provided with dust cover.
9. filtration efficiency detector according to claim 5 is characterized in that: the cabinet part of described cabinet front is provided with glass door, and described glass door is provided with two gloves.
10. filtration efficiency detector according to claim 8, it is characterized in that: the described cabinet outside connects a differential pressure pick-up, shell front in described cabinet part also is provided with control panel, and the detected value of described differential pressure pick-up is presented on the described control panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203083918U CN201477027U (en) | 2009-08-20 | 2009-08-20 | Air filter material filter efficiency detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203083918U CN201477027U (en) | 2009-08-20 | 2009-08-20 | Air filter material filter efficiency detector |
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| Publication Number | Publication Date |
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| CN201477027U true CN201477027U (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009203083918U Expired - Fee Related CN201477027U (en) | 2009-08-20 | 2009-08-20 | Air filter material filter efficiency detector |
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| CN (1) | CN201477027U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342131A (en) * | 2020-09-30 | 2021-02-09 | 济南寰正科技发展有限公司 | Experimental instrument for bacterial filtration efficiency |
-
2009
- 2009-08-20 CN CN2009203083918U patent/CN201477027U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112342131A (en) * | 2020-09-30 | 2021-02-09 | 济南寰正科技发展有限公司 | Experimental instrument for bacterial filtration efficiency |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20180820 |
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| CF01 | Termination of patent right due to non-payment of annual fee |