DE1893694U - SUCTION AIR FILTER WITH THE SUPPLY AIR AND EXHAUST AIR BLOWED UPPER FILTER BODIES. - Google Patents

Description

Neue Seite 1 »from 16v April 1964 file number :, O 7250/3 @d Qhm

Dipl. «Lug. Friedrich ORTMANN.
Stuttgart ~ Siilenbuch

. Utility law registration: Germany
Password; "Unterdruekregelling ¹¹

A 9471
Dr.Qu / B

/ Suction air filter with the supply air · ^ and discharge blowers upstream ^ filter bodies - * y

The innovation concerns edn suction air filters for dust removal and ventilation

from or from several parallel-connected printing rooms% with each Supply air «and exhaust air fan a corresponding filter body is switched on.

According to the innovation, this suction air filter is "with one of the leakage air rate and the degree of the filter load unrelatedö.j: - automatically to a certain XjUftzahl controllable ^ air blower equipped during the individual Negative pressure rooms are assigned automatically controllable exhaust fans.

As is well known, laboratories, fabrication and other spaces in those who worked with radioactive substances wiscd, compared to the atmosphere be kept under a certain degree of oppression. This ensures that no radioactive substances or the like in other rooms and in the free atmosphere atmosphere can get to the outside, for example when opening must be feared from external doors.

If there are different zones or individual rooms within a building are available with different levels of negative pressure, must be in the am

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4/16/64

most heavily contaminated rooms, the greatest negative pressure prevail, while the negative pressures in the less endangered trees are lower.

In addition to maintaining a certain negative pressure, .zum Protect the people who work in such buildings, too Sufficiently large air exchange is required in the individual rooms be of different sizes and sometimes take on a considerably large extent kan% especially in rooms, in those with open radioactive preparations work is carried out, e.g. in isotope laboratories.

All of these subordinate tasks are appropriate suction air filter with the supply air «and exhaust air fans upstream Filter bodies met.

There are still further requirements to be met. Thus, both the supplied air and the discharged! Air be filtered must * to entry ton dust and others to prevent suspended solids into the building and prevent the escape of dangerous particulate matter or radioactive substances zm with the exhaust air. Another difficulty to be overcome is that it affects the negative pressure in a room. The amount of air leakage caused by leaks in the building, opening doors, windows, etc., can practically never be precisely determined. In addition, with regard to a certain air throughput, the changing resistance of the supply air and exhaust air filters must be taken into account. as an exhaust air filter for "rooms with radioactive contamination are required, is already very large in itself and continues to increase with increasing dust uptake. These changing factors

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were therefore level in solving the problem mentioned at the beginning if to be considered. '

All of the difficulties listed are in accordance with the present Fixed fire in that - without prejudice to changing amounts of leakage air and changing flow resistances, for example due to increasing load and contamination of the filters in the flow system - a certain flow velocity the supply air through automatic control of the speed, the blade angle and the like of the supply air fan and thus regulates a certain amount of supply air and that the negative pressure by automatically changing the speed, the blade angle and the like. of the exhaust fan is kept at a certain constant value.

Pur building with at least two display varying degrees of negative pressure, and a differently sized air flow having underpressure zones, the total amount of the required supply air is controlled by the flow rate of the supply air in the main supply channel automatically at a predetermined value renewal according to, wherein RUER in the lines leading to the individual pressure zones Kanalabzweigungeä ^e! these negative pressure zones required air quantities are automatically adjusted to the required air throughput. The flow speed of the supply air in the individual branches of the supply air main duct to the various negative pressure zones can also be determined by the pressure difference in front of and behind a flow resistance built into this discharge line and used to control and maintain a certain amount of supply air, e.g. by means of a throttle valve. A suitable cross-sectional constriction, a sieve plate, an electrical heating grid or the like used to heat the air can be used as the static flow resistance.

Setting and maintaining a certain negative pressure in the individual negative pressure zones is carried out according to the innovation by an air pressure measuring device in them, from which certain control flows o. The like. Go out, which the amount of exhaust air to be extracted from the individual negative pressure zones, for example by changing the speed, the blade inclination o. the like. The individual Control the exhaust fan assigned to negative pressure zones.

A 9471. -4-> f

All details about the firing result from the following Description in conjunction with the drawing on which a newly designed ventilation system for a building with three different negative pressure zones schematically is shown.

In each of the three zones 1, 2 and 3 there should be a specific Negative pressure and a certain amount of air throughput regardless of the existing leakage air rate and the degree of loading of the! Filter be respected. The fresh air for the three zones is initially by means of a common supply air fan 5 through an intake filter 4 passed through into a main supply line 6 and from there distributed over branch lines 7 »8, 9 to the individual zones. The amount of air in the main supply line 6 is by means of a Static resistance 10 regulated to a constant value The pressure drop occurring across the static resistance 10 gives a measure for that. Flow velocity and therefore also for the air throughput and is used in a suitable comparison device 11 by comparing the in front of and behind the resistor 10 prevailing pressures determined. The comparison device 11 supplies a control signal as a function of the pressure drop determined, that - as indicated in the drawing - the drive motor 12 of the fan. 5 influence and change its speed can, or the other control measures to change the sucked Can cause the amount of air, for example an adjustment of the fan blades, a change in the intake cross-section or the like,

The air throughput in the individual branch lines 7 »8 and 9 is also by means of static resistors 13 »14» 15 and Comparison devices 16, 17, 18 are determined. The level signals the comparison devices 16 to 18 control the position of throttle valves 19 to 21 in the branch lines .. Instead of the Pressure difference measuring device in front of and behind static resistances Other measuring methods and devices for controlling the air flow rate can also be used.

In each building zone 1, 2, 3, the negative pressure is by means of a pressure gauge 22, 23 »'24 monitored. The individual zones separately assigned exhaust fans 25, 26, 27 are dependent of the measured values of the associated pressure gauges 22, 23 »24

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A 9471 -5-

operated in such a way that a preselected and constant S-er Negative pressure is present in building zones 1, 2 and 3. This happens "for example by changing the speed or the blade inclination or the like. The exhaust fan by the pressure gauges 22, 23, 24 outgoing control signals. The air blower 25, 26, 27 are each fine filters 28 to 30 connected downstream, the escape of radioactive dust particles o. The like. With the exhaust air from the Prevent negative pressure zones.

The constant air throughput is regulated on the supply side, while the constant negative pressure is separated in the lonely building areas is controlled from each other and from the exhaust air side. At the same time, there are changes in resistance occurring at the filters as well as the amount of air leakage occurring in the building is compensated. If there are no absolute filters in the supply air intake line the supply air volume can be regulated by a fan at constant speed.

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Claims (5)

KA2 / ti 203 * 1 / AIj A 9471 Aktenzeichen ^ O 725Ö / 36d Gbm Dr.Qu / B ο ir (Tv, "W · F. GRTMAOT Heue Änprüclie yom IH April 1964 1. Suction air filter with the upstream filter bodies (4, 28 ^ 29, 3D) for several negative pressure rooms ( _{1, 2 #} 3) connected in parallel with dust separation and ventilation, marked that it is equipped with a supply air fan (BJ that is independent of the leakage air rate and the degree of filter loading _{) that can be automatically controlled to a certain amount of air and is further characterized in that the individual negative pressure chambers (1 Λ} 2 ^ 3) are automatically controllable exhaust air fans (25 ,. 26,27) are assigned, 2. suction air filter according to claim 1 * characterized in that the supply air « blower motor ^ 12.) 'by means of the flow rate of the entire Supply air automatically to a certain total amount of supply air per unit of time is controlled, 3. suction air filter according to claim. 2> characterized ^ that the pressure « different in front of and behind a static resistance (IQ) in the supply air line is used as a control element for the supply air fan motor (12). 4. suction air filter according to claim 2 and / or 3, characterized in that each of the negative pressure chambers (1 ·, · \ 3) is allocated a certain proportion of the total supply air, which "automatically dur <2h an adjustable throttle · * flap ( 19, 2, 0.21). Or the like, which is controlled by the pressure difference in front of and behind a static resistance (13, 14, 15) in the relevant part "ZuluftleitUH.g. 5. suction air filter according to at least one of claims 1 to 4> characterized in that "the motors of the exhaust fan (25, 26 ^ 27) by a Pressure measuring element (22,23,24) are each controlled so that a pre The given pressure prevails in the individual underpressure spaces (1, 2, 3).