DE202006013800U1 - Test stand for protective clothing, has bypass channel designed such that sample is flowable and circulatable through it, where bypass channel is formed by gap between side of clamping frame and flow channel - Google Patents

Abstract

The stand has a measuring instrument (30) comprising a clamping frame (35) and a measuring chamber (40), where the frame has a clamping unit to clamp a laminar sample (31), and sample flowing and return sides (32, 33). The chamber is connected to the side (33) and includes a housing comprising a discharge feed pipe to attach the housing to a particle measuring instrument (50). A bypass channel (80) is designed in such a manner that the sample (31) is flowable and circulatable through it. The bypass channel is formed by a gap between a side of the frame and a flow channel (25). An independent claim is also included for a measuring instrument.

Description

The The invention relates to a test stand for determining particle retention of permeable protective materials for Protective suits.

A previous test rig for determining the particle retention capacity of ABC filter materials has the following features:
The test stand comprises a clamping frame which has clamping means with which a flat ABC filter material can be clamped in a sealed manner at the edge. The clamping frame has a sample inlet side and a sample rear side when the sample is clamped. The test stand has a flow channel through which an air stream with a set content of particles flows in the test mode. The air flow with the particles simulates a poisonous aerosol cloud of ABC-agent. In experimental operation, the clamping frame with the clamped sample is also installed in the flow channel so that the air flow is passed exclusively through the sample. The particles are then measured in the air stream after flowing through the sample.

Of the Disadvantage of the known test bench is in that he is for ABC filter materials and not for permeable protective materials designed for protective suits is. Would one with the known test stand permeable protective materials for protective Suits examine, would the values obtained are less meaningful in relation to the actual Use of protective suits. Because the permeable protective material is not included in the application flows through high pressure.

The The object of the invention is to provide a test stand for Determine Particle Retention Capacity of permeable protective materials for protective Suits train so that a stronger reference to the actual load is achieved. Furthermore, there is the task in it, a measuring arrangement for one test bench to accomplish.

These The object is achieved by a test bench solved with the features of claim 1, further by a measuring arrangement according to claim 4.

Of the test bench comprises a measuring arrangement, which in turn a clamping frame and includes a measuring chamber. The clamping frame has clamping means on, with which a two-dimensional Sample edge sealed sealed. The clamping frame has a sample inlet side and a sample rear side when the sample is clamped on. When the sample is clamped, the back of the sample closes Measuring chamber on. The measuring chamber points to the back of the sample open measuring chamber housing on. The measuring chamber housing has an exhaust pipe up, over a particle meter can be connected. The particle measuring device sucks air out of the measuring chamber and determines the content of particles. The measured content of particles corresponds to the value of the permeability the sample of permeable protective materials to particles. The measuring chamber also has a supply nozzle up, over supplied to the purified air becomes. This sets the value of the negative pressure in the measuring chamber and equalizes the air flow, which is discharged from the measuring chamber and the particle measuring device supplied becomes. In experimental operation, the measuring arrangement is in the flow channel built-in. Furthermore, the test bench in the experimental operation at least one bypass channel, which is formed is that the clamped sample is vorströmbar and flow around. The flow and flow around the special and resulting from the advantages of the invention. Because this is the actual Stress simulated. Imagine a protective suit in use Before, the permeable protective suit material is not flowed through at high pressure. Much more On the one hand, the protective suit is exposed to the wind, the partial to a certain overpressure leads. Furthermore, on the other hand, pumping and suction effects occur inside the suit due to the movements of the suit wearer. Due to the bypass channel and because of the flow and flow around The sample gives a better match with the load case of the Reality. The overpressure across from The interior of the measuring chamber can be adjusted so that it conditions corresponds to a wind load or the load due to the pumping effect. The formation of the measuring chamber in conjunction with the measuring chamber housing simulated seen abstractly the carrier a protective suit. Because the penetration of particles over the Sample in the measuring chamber is similar to the penetration of harmful Particles over a protective suit in the body area a carrier a protective suit.

According to one Embodiment of the invention is the bypass channel through a gap between at least one side of the clamping frame and the flow channel educated. This represents a structurally simple and cost-effective design represents.

According to one Another embodiment of the invention, the clamping means of Clamping frame pneumatically actuated. This facilitates the clamping and unclamping of a sample.

The The invention will be described below with reference to an illustrated in the drawings embodiment described in more detail. Showing:

1 a test bench with only the main facilities for determining the Parti kel-Rückhaltevermögens of permeable protective materials for protective suits, as a schematic diagram;

2 the measuring arrangement of in 1 shown test stand, also as schematic sketch.

The 1 shows a test stand for determining the particle retention of permeable protective materials for protective suits.

With the help of a blower 10 you generate an airflow. The intake takes place via a pre-filter 70 , Following the blower 10 a sensor (not shown) for measuring the flow rate is arranged. An aerosol generator 15 sets the generated airflow to the particles. Subsequently, the particles are detected in the air flow by measurement. A nozzle 20 compresses the airflow and allows to set the direction of the airflow. The nozzle 20 is therefore a replacement part and can have the desired geometry depending on the experimental procedure. This is followed by a measuring arrangement 30 with a clamped sample 31 and a particle meter 50 , Via an exhaust filter 60 the airflow reaches the outside. A recirculation mode is also possible.

The 2 shows the measuring arrangement 30 in detail. The measuring arrangement 30 is part of the previously described test bench for determining the particulate retention capacity of permeable protective suits for protective suits. The measuring arrangement 30 includes a clamping frame 35 and a measuring chamber 40 , The clamping frame 35 has clamping means with which a flat sample 31 can be clamped sealed at the edge. The clamping frame 35 indicates with clamped sample 31 a sample inlet side 32 and a sample back 33 on. With clamped sample 31 joins the back of the sample 33 the measuring chamber 40 at. The measuring chamber 40 has a measuring chamber housing open towards the back of the sample 45 on. The measuring chamber housing 45 has an exhaust pipe 41 on top of which a particle gauge 50 is connectable. The measuring chamber housing 45 also has a supply nozzle 42 on, over the purified air can be supplied. The test stand has a flow channel 25 through which flows during the experimental operation, an air flow with a set content of particles. In trial operation is the measuring arrangement 30 in the flow channel 25 built-in. In addition, the test bench has at least one bypass channel in trial operation 80 on, which is designed so that the clamped sample 31 can be flowed around and flow around.

As shown, the bypass channel is 80 through a gap between the flow channel 25 and at least one side of the built-in clamping frame 35 educated.

The clamping means of the clamping frame 35 are pneumatically actuated.

• • Die Messanordnung 30 ist an das Partikelmessgerät 50 angeschlossen.
• • Zunächst fährt man den Prüfstand hoch, bis sich der Luftstrom stabilisiert hat (Einlaufphase).
• • Dann startet man den Prüfzyklus und beginnt mit den Messungen.
• • Aufgrund der Umströmung und Anströmung wird die Probe 31 mit dem Partikel enthaltenden Luftstrom beaufschlagt. Anteile von Partikeln durchdringen die Probe 31 und gelangen in die Messkammer 40.
• • Über den Abführungsstutzen 41 gelangt Luft aus der Messkammer 40 in das Partikelmessgerät 50. In dem Partikelmessgerät 50 erfolgt eine Zählung der Partikel des angesaugten Luftstromes.
• • Der Luftstrom wird gereinigt und der Messkammer 40 über den Zuführungsstutzen 42 wieder zurückgeführt.

The function of the test bench becomes particularly clear, considering the following steps during the test procedure:

• • The measuring arrangement 30 is to the particle gauge 50 connected.
• • First, raise the test stand until the air flow has stabilized (run-in phase).
• • Then start the test cycle and start the measurements.
• • Due to the flow around and the flow, the sample becomes 31 subjected to the particle-containing air flow. Particles of particles penetrate the sample 31 and get into the measuring chamber 40 ,
• • Over the discharge pipe 41 air comes out of the measuring chamber 40 into the particle measuring device 50 , In the particle measuring device 50 there is a count of the particles of the sucked air flow.
• • The air flow is cleaned and the measuring chamber 40 over the feed pipe 42 returned again.

• • Das Gebläse 10 erzeugt einen regelbaren Luftstrom von 1000 l/min bis 9000 l/min.
• • Als Aerosolgenerator 15 dient ein handelsüblicher (AGF 10.0 der Fa. Palas GmbH) Flüssigkeitszerstäuber mit einem Zyklonabscheider. Zum Generieren dient Di-Ethyl-Hexyl-Sebacat in flüssiger Form. Der Aerosolgenerator 15 vernebelt diese Flüssigkeit zu einem polydispersen Aerosolstoff. Es werden Partikel mit einem mittleren Durchmesser von ca. 1-3 μm erzeugt. Das Aerosol vermischt sich mit dem Volumenstrom.
• • Das Partikelmessgerät 50 ist ein handelsüblicher, optischer Aerosolspectrometer (welas^® 3000 der Fa. Palas GmbH).
• • Der Prüfstand ist mit unterschiedlich großen Messanordnungen betreibbar, um Proben der Größe 50mm × 50 mm bis 400mm × 400mm einspannen zu können.

The details of the test stand will be described below.

• • The blower 10 generates an adjustable air flow of 1000 l / min to 9000 l / min.
• • As an aerosol generator 15 is a commercial (AGF 10.0 Fa. Palas GmbH) liquid atomizer with a cyclone separator. Di-ethyl-hexyl-sebacate in liquid form is used for the generation. The aerosol generator 15 atomizes this fluid into a polydisperse aerosol. It produces particles with a mean diameter of about 1-3 microns. The aerosol mixes with the volume flow.
• • The particle analyzer 50 is a commercially available, optical Aerosolspectrometer (welas ^® 3000 Fa. Palas GmbH).
• • The test bench can be operated with different sized measuring arrangements to clamp samples of the size 50mm × 50mm up to 400mm × 400mm.

10

fan

15

aerosol generator

20

jet

25

flow channel

30

measuring arrangement

31

sample

32

Probenanströmseite

33

Samples back

35

chucking

40

measuring chamber

41

discharging pipe

42

supply connection

45

Measuring chamber housing

50

particle Sizer

60

exhaust filter

70

prefilter

80

bypass channel

Claims (4)

Test rig for determining the particulate retention capacity of permeable protective suits for protective suits, comprising: a) the test rig comprises a measuring arrangement ( 30 ), b) the measuring arrangement ( 30 ) comprises a clamping frame ( 35 ) and a measuring chamber ( 40 ), c) the clamping frame ( 35 ) has clamping means with which a flat sample ( 31 ) can be clamped sealed at the edge, d) the clamping frame ( 35 ) shows with clamped sample ( 31 ) a sample inlet side ( 32 ) and a sample backside ( 33 ), e) with a clamped sample ( 31 ) connects to the back of the sample ( 33 ) the measuring chamber ( 40 ), f) the measuring chamber ( 40 ) has a measuring chamber housing which is open toward the rear of the sample ( 45 ), g) the measuring chamber housing ( 45 ) has an exhaust pipe ( 41 ) through which a particle measuring device ( 50 ), h) the measuring chamber housing ( 45 ) further comprises a supply nozzle ( 42 ), via which cleaned air can be supplied, i) the test stand has a flow channel ( 25 ), through which an air flow with a set content of particles flows in the test mode, j) in the experimental mode, the measuring arrangement ( 30 ) in the flow channel ( 25 k) in test mode, the test bench has at least one bypass channel ( 80 ), which is designed so that the clamped sample ( 31 ) of the measuring arrangement ( 30 ) and can flow around. Test stand according to Claim 2, in which the bypass channel ( 80 ) through a gap between the flow channel ( 25 ) and at least one side of the built-in clamping frame ( 35 ) is formed. Test stand according to Claim 1 or 2, in which the clamping means of the clamping frame ( 35 ) are pneumatically actuated. Measuring arrangement ( 30 ) with the features mentioned in claim 1 or 3.