CN204288023U - Be applied to multiple air-flow supervising devices of Biohazard Safety Equipment - Google Patents
Be applied to multiple air-flow supervising devices of Biohazard Safety Equipment Download PDFInfo
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- CN204288023U CN204288023U CN201420650121.6U CN201420650121U CN204288023U CN 204288023 U CN204288023 U CN 204288023U CN 201420650121 U CN201420650121 U CN 201420650121U CN 204288023 U CN204288023 U CN 204288023U
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- 238000005070 sampling Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 abstract description 10
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- 238000002474 experimental method Methods 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
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Abstract
The utility model is applied to multiple air-flow supervising devices of Biohazard Safety Equipment, comprising: pressure sensing cell, for sampling the force value in circulation passage; Pressure sensor unit, pressure sensor unit is connected with pressure sensing cell, and the pressure value signal be sampled to by pressure sensing cell is converted to electric signal; Hot type air velocity transducer, for the down current flow velocity in surveying work district and inflow air-flow velocity; Master controller, master controller is for the treatment of the signal sent by pressure sensor unit and hot type air velocity transducer.Multiple air-flow supervising device master controllers that the utility model is applied to Biohazard Safety Equipment judge it is that fault has appearred in which sensor by the signal that two other normal sensor exports; avoid the risk that independent tonometry is not accurate enough; and hot type air velocity transducer and differential pressure pick-up mutually monitoring there is multiple monitoring effect; monitoring is safer mutually for both, at utmost can must provide protection for experiment operator and sample.
Description
Technical field
The utility model relates to Biohazard Safety Equipment technical field, is specifically related to a kind of device being applied to the maltilevel security supervisory function bit of Biohazard Safety Equipment.
Background technology
Biohazard Safety Equipment is a kind of is prevent the purification of air safety feature containing harmfulness or the dissipation of unknown gasoloid in operating process, to the laboratory special protection equipment that operating personnel, product and environment play a protective role.The air-flow that Biohazard Safety Equipment is inwardly sucked by front window gathering hole is in order to protect the safety of personnel; Through high efficiency particulate air filter filter down current in order to protect safety and the cross pollution of product; Air-flow discharges safety cabinet with protection of the environment after high efficiency particulate air filter filters.
All Biohazard Safety Equipments realize protection against biological harm, provide safe working environment to be all by several principle below: 1. realize high efficiency filter by high efficiency particle air filter (HEPA) to gas; 2. control ducting system, workspace is surrounded by negative pressure, forms perfect flow pattern.Biohazard Safety Equipment flows into the flow velocity of air-flow and the flow velocity of workspace down current to front window strict requirement, can not too low can not be too high, otherwise the effect of protection personnel and laboratory sample can not be played.Biohazard Safety Equipment inside is provided with wind speed measuring device, has a kind of mode to be by tonometry in practical application, in the negative pressure channel that two piezometric tube are arranged on safety cabinet respectively and positive pressure passageway; The relational expression of blast and wind speed is drawn according to Bernoulli equation:
V
2＝K×2P/ρ
Wherein P is blast (Pa), K is constant, and ρ is atmospheric density (kg/m
3), V is wind speed (m/s).
Because the inflow air-flow of Biohazard Safety Equipment is inhaled in negative pressure channel, the pressure that piezometric tube in negative pressure channel is sampled to and inflow air-flow wind speed V have correlativity, by pressure transducer, piezometric pressure value is converted to magnitude of voltage again, main control module obtains pressure P again by above-mentioned formulae discovery air-flow velocity V according to the electric signal that pressure transducer exports.Equally, the pressure pressure transducer measured according to the piezometric tube in positive pressure passageway calculates workspace down current flow velocity after changing.But adopt tonometric mode indirect inspection wind speed to have certain risk in actual use, the pressure signal measured often is subject to the impact of other factors interference; When such as in use equipment air inlet is blocked; the pressure increase of the reduction negative pressure channel of incoming air area; the pressure that piezometric tube in negative pressure channel is sampled to becomes large; but the inflow air flow rate due to inhalation device reduces to cause the down current flow velocity of workspace to reduce; thus increase according to pressure reduction calculated value and actual wind speed value deviation; serious security risk can be caused, the defencive function of personnel and sample even can not be provided, lose the meaning using Biohazard Safety Equipment protection.
Utility model content
The purpose of this utility model is to provide a kind of can flow into the multiple air-flow supervising devices being applied to Biohazard Safety Equipment of air-flow velocity and down current flow velocity by Measurement accuracy equipment.
For solving the problems of the technologies described above, the utility model is applied to multiple air-flow supervising devices of Biohazard Safety Equipment, comprise: pressure sensing cell, described pressure sensing cell is arranged in the circulation passage of Biohazard Safety Equipment, for sampling the force value in described circulation passage; Pressure sensor unit, described pressure sensor unit is connected with described pressure sensing cell, and the pressure value signal that described pressure sensing cell is sampled to is converted to electric signal; Hot type air velocity transducer, in the workspace that described hot type air velocity transducer is arranged on Biohazard Safety Equipment and air stream efflux region, for the down current flow velocity measured in described workspace with flow into air-flow velocity; Master controller, described sensor unit and described hot type air velocity transducer are of coupled connections with described master controller respectively, and described master controller is for the treatment of the signal sent by described pressure sensor unit and described hot type air velocity transducer.
Described pressure sensing cell comprises: sampling below atmospheric pressure pipe, and described sampling below atmospheric pressure pipe is arranged in the circular negative-pressure passage of Biohazard Safety Equipment, for detecting the force value in described circular negative-pressure passage; Malleation stopple coupon, in the positive pressure passageway of circulation that described malleation stopple coupon is arranged on Biohazard Safety Equipment, for detecting the force value in the positive pressure passageway of described circulation.
Described pressure sensor unit comprises: the first differential pressure pick-up, and described first differential pressure pick-up is connected with described sampling below atmospheric pressure pipe, and the pressure signal that described sampling below atmospheric pressure pipe records is converted to electric signal; Second differential pressure pick-up, described second differential pressure pick-up is connected with described malleation stopple coupon, and the pressure signal that described malleation stopple coupon records is converted to electric signal.
Also comprise fan speed adjuster, described fan speed adjuster is connected with the blower fan of master controller and Biohazard Safety Equipment, and described master controller sends signal adjusts described blower fan rotating speed to described fan speed adjuster.
Comprise warning device further, described warning device is connected with described master controller, and described master controller sends sound and light alarm signal to described warning device.
Multiple air-flow supervising devices that the utility model is applied to Biohazard Safety Equipment adopt another kind of calorifics principle (theoretical according to LVKing, by the flowing gas of certain density and quality, the certain heat of body surface higher than environment temperature can be taken away, under so certain wind speed, air velocity transducer will be pulled away certain heat and reach temperature equilibrium, measure heating power P, sensor temperature values T1, environment temperature T2, just can extrapolate current wind speed under known conditions) hot type air velocity transducer directly measure and combine with tonometry, air-flow velocity and down current flow velocity can be flowed into by Measurement accuracy equipment, the electric signal that hot type air velocity transducer exports and the electric signal that differential pressure pick-up exports are mutually related, if wherein there is fault in any one sensor, output valve changes, master controller judges it is that fault has appearred in which sensor by the signal that two other normal sensor exports, avoid the risk that independent tonometry is not accurate enough, and hot type air velocity transducer and differential pressure pick-up mutually monitoring there is multiple monitoring effect, monitoring is safer mutually for both, at utmost can must provide protection for experiment operator and sample.
Accompanying drawing explanation
Fig. 1 is multiple air-flow supervising device theory diagrams that the utility model is applied to Biohazard Safety Equipment;
Fig. 2 is multiple air-flow supervising device scheme of installations one that the utility model is applied to Biohazard Safety Equipment;
Fig. 3 is multiple air-flow supervising device scheme of installations two that the utility model is applied to Biohazard Safety Equipment;
Fig. 4 is multiple air-flow supervising device workflow diagrams that the utility model is applied to Biohazard Safety Equipment.
The utility model is applied to description of reference numerals in multiple air-flow supervising device accompanying drawings of Biohazard Safety Equipment:
1-workspace 2-sampling below atmospheric pressure pipe 3-malleation stopple coupon
4-first differential pressure pick-up 5-second differential pressure pick-up 6-flows into air-flow
7-down current 8-hot type air velocity transducer 9-circular negative-pressure passage
10-circulate positive pressure passageway 11-discharge air-flow
Embodiment
Below in conjunction with accompanying drawing, multiple air-flow supervising devices that the utility model is applied to Biohazard Safety Equipment are described in further detail.
As shown in Figure 1 to 4, the utility model is applied to multiple air-flow supervising devices of Biohazard Safety Equipment, comprises at least one hot type air velocity transducer device 8, sampling below atmospheric pressure pipe 2, malleation stopple coupon 3,1 first differential pressure pick-up 4,1 second differential pressure pick-up 5, master controller, a warning device, a fan speed adjuster.Sampling below atmospheric pressure pipe 2 is connected with the first differential pressure pick-up 4; Malleation stopple coupon 3 is connected with the second differential pressure pick-up 5; Hot type air velocity transducer 5, first differential pressure pick-up 4 is connected with master controller with the second differential pressure pick-up 5; Warning device, fan speed adjuster are connected with master controller.Hot type air velocity transducer 8 take platinum-membrane resistor or platinum filament as a kind of sensor of main thermal sensing element, and the first differential pressure pick-up 4 and the second differential pressure pick-up 5 are with the sensor that be semiconductor pressure resistance element is pressure-sensing device.
During work, the electric signal calculating work space down current wind speed V that the first step, master controller are changed out according to hot type air velocity transducer 8, and judge that whether down current wind speed is at setting range, if just enter step 2; Improve or reduce air-flow wind speed if not the rotating speed then sending signal fan arrangements for speed regulation adjustment blower fan, until judge that down current wind speed is stable to enter step 2.
The first differential pressure pick-up 4 that step 2, master controller connect sampling below atmospheric pressure pipe 2 and the second differential pressure pick-up 5 export electric signal to carry out process and calculates and flow into air-flow velocity and then compare, being be greater than initial pressure value 120% when recording negative pressure mean value, sending warning message that air inlet gets clogged to warning device; When record that negative pressure mean value is initial pressure value 50% ~ 80%, send flow into deficiency of air alerting signal to warning device; If it is normal to record negative pressure mean value, then enter step 3.
Step 3, master controller export electric signal to the second differential pressure pick-up 5 that malleation stopple coupon 3 connects to carry out process and calculates down current flow velocity and then compare, be initial pressure value more than 200% when recording mean positive pressure, master controller sends alerting signal that high efficiency particulate air filter blocks to warning device.When recording mean positive pressure and being initial pressure value 50% ~ 80%, master controller sends the warning message of down current deficiency to warning device.When master controller judges that negative pressure mean value and mean positive pressure are all less than 50% of initial pressure value, send the alerting signal of hot type air velocity transducer 8 fault to warning device.
For II grade of conventional at present A2 type safety cabinet, outside inflow air-flow 6 is by the circular negative-pressure passage 9 of equipment air inlet access arrangement, the discharge air-flow 11 of 30% is discharged by outer row's high efficiency particulate air filter, and the air-flow of 70% enters workspace 1 by vertical high efficiency particulate air filter and carries out inner loop, i.e. Q
decline/ Q
flow into=0.7 (Q is air quantity).
Be wind speed according to formula V=Q/AV, A is sectional area.V
decline/ V
air intake=(Q
decline× A
flow into)/(Q
stream enter× A
decline)=(0.7 × A
flow into)/A
decline; If the sectional area A air intake of air inlet declines constant with the sectional area A of vertical high efficiency particulate air filter, so V
declineand V
flow intojust there is the proportional relationship that linear.
As shown shown in 3-1, the electrical power P (V) that hot type air velocity transducer 8 consumes and wind speed V have the relation of a curve, by a change-over circuit determining that the P (V) of wind speed range converts to close to linear signal Uout, as shown in table 3-2.
Such down current 7 flow velocity is converted to voltage signal Uout and exports, and carries out AD conversion and data fitting process turn and calculate current down current wind speed V by master controller
decline.Master controller judges that whether down current wind speed is at setting range, if just enter step 2; Improve or reduce air-flow wind speed if not the rotating speed then sending signal fan arrangements for speed regulation adjustment blower fan, until judge that down current wind speed is stable to enter next step.
Second step, sampling below atmospheric pressure pipe 2 is positioned at the circular negative-pressure passage 9 of equipment, by its latter linked first differential pressure pick-up 4, air inlet pressure signal is converted to electric signal, by master controller according to formula:
V
2＝K×2P/ρ
Air inlet pressure P is converted and converts the inflow wind speed V of air inlet to
flow into.Malleation stopple coupon 3 is positioned at the malleation path 10 of equipment, and air outlet pressure signal is converted to electric signal by its latter linked second differential pressure pick-up 5, according to above-mentioned formula, air outlet conversion pressure is become the wind speed V of air outlet by master controller
air-out, and V
decline=V
air-out/ M (M is the proper drag coefficient of high efficiency particulate air filter).By above equation, obtain V
decline=(0.7 × A
flow into× V
flow into)/A
decline=V
air-out/ M.The electric signal of the electric signal that the device hot type air velocity transducer 8 that such utilization the utility model adopts exports and the output of the first differential pressure pick-up 4, second differential pressure pick-up 5 is interrelated.
Be such as 80Pa at the negative pressure initial value of Biohazard Safety Equipment master controller keeping records when dispatching from the factory debugging, normal pressure initial value is 150Pa, and concrete deterministic process is as follows:
At V
declinesubstantially when constant, master controller monitoring V
flow intothe negative pressure value of increase and sampling below atmospheric pressure pipe end 2 increases, the sectional area A of air inlet
flow intomust be reduce.When recording negative pressure mean value for being greater than 96Pa (120% of initial pressure value 80Pa), master controller sends warning message that air inlet gets clogged to warning device.
Same at V
flow intoand V
declinesubstantially when constant, V
air-outthe pressure reduction of increase and malleation stopple coupon 3 increases, mean that the coefficient M of high efficiency particulate air filter resistance increases, when mean positive pressure is greater than 300Pa (200% of initial pressure value 150Pa), master controller sends the alerting signal of high efficiency particulate air filter obstruction to warning device.
At V
flow intoand V
air-outnamely the negative pressure mean value of sampling below atmospheric pressure pipe end 2 and the mean positive pressure of malleation stopple coupon 3 situation about all reducing, this means V
declinemust be reduce, and V
declineto be master controller send signal according to the electric signal that hot type air velocity transducer 8 conversion draws exports to the rotating speed of fan speed adjuster adjustment blower fan and changes, should this V
declinepositively related with the electric signal that hot type air velocity transducer 8 conversion draws.When master controller judge negative pressure mean value be 40Pa ~ 64Pa interval in (50% ~ 80% of initial pressure value 80Pa), send and flow into the alerting signal of deficiency of air to warning device; When master controller judge mean positive pressure be 75Pa ~ 120Pa interval in (50% ~ 80% of initial pressure value 150Pa), send the warning message of down current deficiency to warning device; When master controller judges that negative pressure mean value is less than 40Pa (50% of initial pressure value 80Pa) and mean positive pressure is less than 75Pa (50% of initial pressure value 150Pa), send the alerting signal of hot type air velocity transducer fault to warning device.
Multiple air-flow supervising devices that the utility model is applied to Biohazard Safety Equipment adopt another kind of calorifics principle (theoretical according to LVKing, by the flowing gas of certain density and quality, the certain heat of body surface higher than environment temperature can be taken away, under so certain wind speed, air velocity transducer will be pulled away certain heat and reach temperature equilibrium, measure heating power P, sensor temperature values T1, environment temperature T2, just can extrapolate current wind speed under known conditions) hot type air velocity transducer directly measure and combine with tonometry, air-flow wind speed and decline wind speed can be flowed into by Measurement accuracy equipment, the electric signal that hot type air velocity transducer exports and the electric signal that differential pressure pick-up exports are mutually related, if wherein there is fault in any one sensor, output valve changes, master controller judges it is that fault has appearred in which sensor by the signal that two other normal sensor exports, avoid the risk that independent tonometry is not accurate enough, and hot type air velocity transducer and differential pressure pick-up mutually monitoring there is multiple monitoring effect, monitoring is safer mutually for both, at utmost can must provide protection for experiment operator and sample.
Below the preferred embodiment that the utility model is created is illustrated, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modification or replacement under the prerequisite without prejudice to the utility model creative spirit, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (5)
1. be applied to multiple air-flow supervising devices of Biohazard Safety Equipment, its feature is being, comprising:
Pressure sensing cell, described pressure sensing cell is arranged in the circulation passage of Biohazard Safety Equipment, for sampling the force value in described circulation passage;
Pressure sensor unit, described pressure sensor unit is connected with described pressure sensing cell, and the pressure value signal that described pressure sensing cell is sampled to is converted to electric signal;
Hot type air velocity transducer, in the workspace that described hot type air velocity transducer is arranged on Biohazard Safety Equipment and air stream efflux region, for the down current flow velocity measured in described workspace with flow into air-flow velocity;
Master controller, described sensor unit and described hot type air velocity transducer are of coupled connections with described master controller respectively, and described master controller is for the treatment of the signal sent by described pressure sensor unit and described hot type air velocity transducer.
2. the multiple air-flow supervising devices being applied to Biohazard Safety Equipment according to claim 1, it is characterized in that, described pressure sensing cell comprises:
Sampling below atmospheric pressure pipe, described sampling below atmospheric pressure pipe is arranged in the circular negative-pressure passage of Biohazard Safety Equipment, for detecting the force value in described circular negative-pressure passage;
Malleation stopple coupon, in the positive pressure passageway of circulation that described malleation stopple coupon is arranged on Biohazard Safety Equipment, for detecting the force value in the positive pressure passageway of described circulation.
3. the multiple air-flow supervising devices being applied to Biohazard Safety Equipment according to claim 2, it is characterized in that, described pressure sensor unit comprises:
First differential pressure pick-up, described first differential pressure pick-up is connected with described sampling below atmospheric pressure pipe, and the pressure signal that described sampling below atmospheric pressure pipe records is converted to electric signal;
Second differential pressure pick-up, described second differential pressure pick-up is connected with described malleation stopple coupon, and the pressure signal that described malleation stopple coupon records is converted to electric signal.
4. the multiple air-flow supervising devices being applied to Biohazard Safety Equipment according to claim 1, it is characterized in that, also comprise fan speed adjuster, described fan speed adjuster is connected with the blower fan of master controller and Biohazard Safety Equipment, and described master controller sends signal adjusts described blower fan rotating speed to described fan speed adjuster.
5. the multiple air-flow supervising devices being applied to Biohazard Safety Equipment according to claim 1, it is characterized in that, comprise warning device further, described warning device is connected with described master controller, and described master controller sends sound and light alarm signal to described warning device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420650121.6U CN204288023U (en) | 2014-11-03 | 2014-11-03 | Be applied to multiple air-flow supervising devices of Biohazard Safety Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420650121.6U CN204288023U (en) | 2014-11-03 | 2014-11-03 | Be applied to multiple air-flow supervising devices of Biohazard Safety Equipment |
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| Publication Number | Publication Date |
|---|---|
| CN204288023U true CN204288023U (en) | 2015-04-22 |
Family
ID=52871163
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|---|---|---|---|
| CN201420650121.6U Expired - Lifetime CN204288023U (en) | 2014-11-03 | 2014-11-03 | Be applied to multiple air-flow supervising devices of Biohazard Safety Equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407650A (en) * | 2014-11-03 | 2015-03-11 | 上海力申科学仪器有限公司 | Multi-airflow monitoring device applied to bio-safety cabinet |
| CN110218645A (en) * | 2019-05-29 | 2019-09-10 | 北京市医疗器械检验所 | Control system for Biohazard Safety Equipment detector |
-
2014
- 2014-11-03 CN CN201420650121.6U patent/CN204288023U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407650A (en) * | 2014-11-03 | 2015-03-11 | 上海力申科学仪器有限公司 | Multi-airflow monitoring device applied to bio-safety cabinet |
| CN110218645A (en) * | 2019-05-29 | 2019-09-10 | 北京市医疗器械检验所 | Control system for Biohazard Safety Equipment detector |
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Granted publication date: 20150422 |