CN2608162Y

CN2608162Y - Air flow circulating device of biological safety cabinet operating chamber

Info

Publication number: CN2608162Y
Application number: CN 03220396
Authority: CN
Inventors: 童定盟; 林啸
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-13
Filing date: 2003-03-13
Publication date: 2004-03-31
Anticipated expiration: 2013-03-13

Abstract

The utility model relates to a biological safety cabinet, in particular to an air flow circulating device of biological safety cabinet operating chamber, which comprises a wind machine, a first air filter and the operating chamber. The first air filter is arranged on the upper part of the operating chamber; the working chamber wind outlet is arranged on the lower part. The air machine is communicated with the operating chamber through the first air filter. The structure point lies in that the utility model also comprises an operating chamber air flow speed control device. The device comprises sensor, a comparator, a reference circuit and a speed adjusting controller. The sensor is arranged in the air passage of the biological safety cabinet, the electric signal outlet end of which is connected with the comparator; the electric signal outlet end is connected with the speed adjusting controller signal inlet end; the speed adjusting controller signal outlet end is connected with the control circuit of the air machine engine. The utility model has the advantages of that the standard state of the air flow in the operating chamber when the air filter resistance grows to guarantee the safety and efficiency of the whole biological safety cabinet.

Description

Biohazard Safety Equipment operating room air current circulation

Technical field

The utility model relates to a kind of Biohazard Safety Equipment, particularly a kind of Biohazard Safety Equipment operating room air current circulation.

Background technology

Biohazard Safety Equipment is for operating personnel and personnel's safety on every side thereof, and the contamination gas colloidal sol that takes place when handling dangerous microorganism is isolated in defence installation in the operating area.It isolates the contaminated air effect, mainly be to finish by the air filtration circulatory system, see Fig. 1 for details, this is a kind of Biohazard Safety Equipment operating room EGR schematic diagram, blower fan 1 air outlet is communicated with first air cleaner, 2 air inlets, the air outlet of first air cleaner 2 then is communicated with

operating room

3,3 lower ends, operating room have exhaust outlet 31, this exhaust outlet 31 is communicated with second air cleaner 4, like this, air-flow flows after passing first air cleaner 2 downward vertically, and produces the uprush curtains at operating room's cabinet door 32, and air communication is crossed workspace exhaust outlet 31 and effluxed through second air cleaner 4 afterwards.In order to guarantee that the workspace is not subjected to the outside contamination air influence, the workspace need guarantee that the speed of pure air laminar flow reaches 0.5m/s, and cleanliness factor is 100 grades, and should make this air velocity stable as far as possible.But present most of safety cabinet adopts the blower fan of fixed rotating speed, when the primary air filter and efflux air cleaner use a period of time after because of grit deposition blocking action, its resistance increases thereupon, makes the flow velocity of clean gas flow not reach requirement, thereby the safe isolation performance of complete machine is weakened.

Invention constitutes

The purpose of this utility model is to overcome weak point of the prior art and provides a kind of can guarantee still that under filter resistance increase situation operating room's gas velocity reaches the Biohazard Safety Equipment operating room air current circulation of standard-required.

The purpose of this utility model realizes by following approach.

Biohazard Safety Equipment operating room air current circulation, comprise blower fan, first air cleaner and operating room, first air cleaner is positioned at the top of operating room, operating room's exhaust outlet then is positioned at the below of operating room, blower fan is communicated with the operating room by first air cleaner, its structural feature is, also include a kind of operating room gas velocity control device, it comprises sensor, comparator, reference circuit and speed setting controller, sensor is installed in the gas channel of Biohazard Safety Equipment, its electrical signal is electrically connected with comparator, the signal output part of comparator then is electrically connected with speed setting controller control signal input, and the signal output part of speed setting controller then is electrically connected with the control circuit of blower motor.

Like this, set corresponding reference parameter value with operating room's standard gas velocity, this basic parameter can be a speed parameter, also can be other can with operating room's standard gas velocity corresponding parameter, this reference parameter value is set in the reference circuit, after filter uses a period of time, because of grit deposition blocking action resistance increases, when operating room's gas velocity changes, respective change also takes place in the relevant parameter value of operating room's random airflow that sensor is taken a sample, this sampling parameters value enters in the comparator and compares with reference parameter value, when the two was unsuitable, comparator output control signal was by speed setting controller control blower motor rotating speed, corresponding raising blast, the resistance that compensating filter increases makes the gas velocity of operating room remain on standard state.

The purpose of this utility model can also realize by following approach:

The classification of basic parameter can be identical with the classification of sensor sampling parameters, for example: the two simultaneously the speed class parameter or be both pressure class parameter; Also can be inequality, for example: the two is respectively speed parameter and pressure parameter, this moment a kind of arithmetic unit of should before comparator, pegging graft, by arithmetic unit the computing of sampling parameters value is become corresponding sampling parameters transformed value, this transformed value parameter classification is identical with the classification of basic parameter, makes between sampling parameters and basic parameter to have comparativity.

As for sensor, multiple choices can certainly be arranged, for example:

This sensor can be a kind of gas velocity sensor, and it can be installed in the operating room, also can be installed in the exhaust passage, operating room.Cross new fixed filter after gas velocity in operating room or gas velocity in operating room exhaust passage as reference parameter value with air communication this moment.

This sensor also can be a micro-pressure sensor, it can be installed between the air inlet and air outlet of first air cleaner, change with the pressure reduction of induction air flow by first air cleaner, at this moment, with the initial resistance of new clothes first air cleaner under standard flow rate as reference parameter value.

The utility model can also further be specially:

Also include second air cleaner, the exhaust outlet of lower end, operating room is communicated with second air cleaner.

Like this, air-flow passes after first air cleaner and flows downward vertically, and produces the uprush curtain at operating room's cabinet door, and air communication is crossed the workspace exhaust outlet and effluxed through second air cleaner afterwards, thereby guarantee to efflux the cleanliness factor of air, do not pollute and do not produce to external world.

Speed setting controller also can have multiple choices, for example:

Speed setting controller is a kind of pole-changing control controller, and it can change its rotating speed by the number of pole-pairs that changes blower motor; Speed setting controller can also be a kind of variable frequency regulating speed control device, and it can be by changing the rotating speed that the fan power frequency changes blower fan.Certainly speed setting controller can also be a variable voltage control controller, or a kind of series resistor speed setting controller, or a kind of chopping regulating speed controller.

When speed setting controller is a kind of variable frequency regulating speed control device, preferably this gas velocity control device also comprises a kind of frequency converter, comparator, reference circuit and speed setting controller all are included among the CPU of this frequency converter, also include a kind of analog-digital converter in this frequency converter, it is plugged between sensor and the CPU.

This frequency converter is the commercially available universal product, so is provided with to be beneficial to improve practicality of the present utility model.

The concrete model of this frequency converter can be MM420 (Siemens manufacturing).

In sum, the utility model has following advantage compared to existing technology: the gas velocity that makes the operating room still can remain on standard state under the situation that the resistance of air cleaner increases, thereby guarantees in use safe, effective of whole Biohazard Safety Equipment.

Description of drawings

Figure 1 shows that the structural representation of the utility model background technology;

Figure 2 shows that the structural representation of the utility model most preferred embodiment;

Figure 3 shows that the circuit frame schematic diagram of the gas velocity control device of the utility model most preferred embodiment;

Figure 4 shows that the electrical block diagram of the gas velocity control device of the utility model most preferred embodiment.

Below we the utility model will be further described in conjunction with the embodiments.

Specific embodiment

Most preferred embodiment:

With reference to Fig. 2, Biohazard Safety Equipment operating room air current circulation, comprise blower fan 1, first air cleaner 2, operating room 3, second air cleaner 4 and operating room's gas velocity control device 5, first air cleaner 2 is positioned at the top of

operating room

3,31 belows that are positioned at operating room 3 of the exhaust outlet of operating room 3, blower fan 1 is communicated with operating room 3 by first air cleaner 2, and the exhaust outlet 31 of lower end, operating room is communicated with second air cleaner 4, because second air cleaner 4 is installed in the air intake passage of blower fan 1, so the exhaust outlet 31 of operating room 3 is communicated with the air inlet of blower fan 1; And the control end of operating room's gas velocity control device 5 is electrically connected with the motor control circuit of blower fan 1, and the other end then is installed in safety cabinet blower fan 1 and the gas channel that operating room 3 is communicated with.

With reference to Fig. 3, operating room's gas velocity control device 5 comprises micro-pressure sensor 51, comparator 52, reference circuit 53, variable frequency regulating speed control device 54 and analog-digital converter 56, micro-pressure sensor 51 is installed in the gas channel of Biohazard Safety Equipment, its electrical signal is electrically connected with comparator 52, the signal output part of comparator 52 then is electrically connected with variable frequency regulating speed control device 54 control signal inputs, the signal output part of variable frequency regulating speed control device 54 then is electrically connected with the control circuit of the motor of blower fan 1, and analog-digital converter 56 then is plugged between micro-pressure sensor 51 and the comparator 53.

With reference to Fig. 4, comparator 52, reference circuit 53, variable frequency regulating speed control device 54 all are included among the CPU of frequency converter 55 that a model is MM420, the model of micro-pressure sensor 51 then is MMC27251A, its AIN-is connected with CPU by analog-digital converter 56 respectively with AIN+, and simultaneously the signal output part of CPU then is electrically connected with the control circuit of the motor of blower fan 1.

It is same as the prior art that the utility model is not stated part.

Claims

1, Biohazard Safety Equipment operating room air current circulation, comprise blower fan (1), first air cleaner (2) and operating room (3), first air cleaner (2) is positioned at the top of operating room (3), the exhaust outlet (31) of operating room (3) then is positioned at the below of operating room (3), blower fan (1) is communicated with operating room (3) by first air cleaner (2), it is characterized in that, also include a kind of operating room's gas velocity control device (5), it comprises sensor (51), comparator (52), reference circuit (53) and speed setting controller (54), sensor (51) is installed in the gas channel of Biohazard Safety Equipment, its electrical signal is electrically connected with comparator (52), the signal output part of comparator (52) then is electrically connected with speed setting controller (54) control signal input, and the signal output part of speed setting controller (54) then is electrically connected with the control circuit of the motor of blower fan (1).

2, Biohazard Safety Equipment according to claim 1 operating room air current circulation is characterized in that also include an arithmetic unit (6), it is plugged between sensor (51) and the comparator (52).

3, Biohazard Safety Equipment according to claim 1 operating room air current circulation is characterized in that sensor (51) can be a kind of gas velocity sensor, can also be a kind of micro-pressure sensor.

4, Biohazard Safety Equipment according to claim 1 operating room air current circulation is characterized in that speed setting controller (54) can be a kind of pole-changing control controller, can also be a kind of variable frequency regulating speed control device, can also be a kind of variable voltage control controller.

5, Biohazard Safety Equipment according to claim 1 operating room air current circulation is characterized in that also comprise a kind of frequency converter (55), comparator (52), reference circuit (53) and speed setting controller (54) all are included among the CPU of this frequency converter (55).

6, Biohazard Safety Equipment according to claim 5 operating room air current circulation is characterized in that frequency converter (55) also includes a kind of analog-digital converter (56), and it is plugged between sensor (51) and the CPU.

7, Biohazard Safety Equipment according to claim 1 operating room air current circulation is characterized in that the concrete model of frequency converter can be MM420.