JPS62108128A - Sampler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in dust collection, particularly to a sample collector suitable for airborne litter in a workplace.

BACKGROUND OF THE INVENTION Sampling of airborne dust for environmental health purposes has been developed by a variety of means. One method attempts to design a sampler that has a single inlet effect over all particle aerodynamic diameters found, considered a "true safe", in still or moving air. .

Devices already exist to accomplish this in windless air (particle aerodynamic diameters up to about 60 microns) and moving air with well-defined speed and direction. The argument that such conditions are rarely encountered in practice and that research is therefore directed toward the discovery of samplers that collect true samples over a sufficiently wide range of particle sizes, wind speeds, and wind directions Possible methods are: A satisfactory sample collector has not yet been created. Yet another method is to consider the sampling characteristics of a person's nose and mouth when breathing. The human body does not act as a perfect sampler, but exhibits different inhalation effects of aerodynamic particle size (relatively independent of wind speed), so the inhalation presented by Pinsent and Armplaster spans a range of wind speeds and wind directions. Whole dust samplers exhibiting substantially identical collection characteristics for the curves appear to be particularly effective devices for testing dust hazards to humans.

SUMMARY OF THE INVENTION The present invention provides a system in which the collection characteristics are approximated by a Pinsent-Arm Plaster curve, having a perforated body and an inlet with a lip projecting through the perforation, and collecting all particles in a gas flowing through the body. a removable filter device having a gas suction device and a gas outlet in sealing engagement with a gas suction device having a filter adapted to collect the gas; The present invention provides a whole dust sampler with a drive engageable head. The speed of the rotational movement is not limited to provide a relatively fast speed achieved over the entire sampling time, 1 to 60 revolutions/min is suitable.

The sampler of the invention is suitable for use in quiet areas such as workshops, and is particularly suitable for use in underground coal mines, in the nuclear and lead industries, as well as for stand-alone samplers and personal samplers. There are numerous useful applications for sampling dust in the work environment. Although the embodiments specifically described herein are not intended to be used in ambient outdoor atmospheric environments, they may be designed to provide a large flow path through the sampler and to address problems such as condensation and insects. Examples can be realized.

Preferably, the sampler has a body containing a gas suction device and a drive, and a rotatable sample head is mounted on the top of the body. The recommended sample head is cylindrical with a small elongated hole positioned horizontally towards the center of the outer surface of the cylinder. A removable filter device is suitably mounted on the sample head and held in sealing engagement with the outlet tube, for example by a pushing device, the outlet tube being frictionally engaged with the sample collection tube connected to the suction device by means of a suitable seal. mated,
It has a circumferential gear driven by an electric motor at a slow, constant speed.

The removable filter device is preferably a sealable device, so that any dust that enters is captured and ultimately weighed. If only the filter is weighed, there is a risk of accidental replacement of the collected dust by ignoring the fish adhering to the inner walls of the filter device. The filter itself can be provided without limitation and can collect all dust particles at a particular sampling; any suitable commercially available filter will work.

A preferred suction device is a diaphragm pump, suitably driven by an electric motor and operated by a battery providing power for the drive.

The invention will be explained in detail below with reference to the accompanying drawings.

Embodiment Referring to FIG. 1, the sample head has two shells 1 and 2 each having a slot 3. The filter device 4 has an upper part 5 having an elongated inlet 6 with a lip to provide access for gas flow. The lower part 7 of the filter housing R4 has an outlet 11 and an r-paper 8 carried over an annular seal 9 and supported on a stainless steel grid 10.

The upper part 5 and the lower part 7 of the filter device 4 are friction fitted to each other;
The upper part 5 engages the two sheets of paper 8 at its bottom. Shell part 1 is bolt 1
2 (not shown) and is used to disassemble the head and remove the filter device 4. A spring-loaded lid 13 attached to the shell 1 acts to press the bottom of the filter device 4 against the synthetic rubber O-ring 14, thus preventing the flow of the filter device 4 from the sample head.
A sealed connection is provided between the inside of the tube and the outlet tube 15.

In the assembled state, the lipped inlet 6 projects slightly from the outer surface of the shell parts 1,2.

The dimensions of the sample head appear to contribute to the efficiency of modeling the inhalation characteristics of the human nose and mouth, and are given here in the embodiment shown on the flesh side. The head diameter is 50 mm, and the length of the cylindrical portion is 52 mm. The inlet groove is 3++on wide and 1stIm long, with the inlet lip 2rIm from the head shell.
A11 is prominent.

However, it is expected that other combinations of dimensions will be found with experience equal to or exceeding the illustrations of this embodiment. Nevertheless, this embodiment is convenient and of effective size.

The remainder of the sampler is shown in FIG. 2 and includes a single-acting diaphragm pump 1 driven by an electric motor 18.
7 is attached to a stand 16. The inlet side of the diaphragm pump 17 is connected by a flexible plastic tube 19 to an air chamber 20 for smoothing the flow. Furthermore, the air chamber 20 is connected to a polytetrafluoroethylene tube 21 which is urged by a spring 22 against the tapered end of a rotatable inlet tube 23. The inlet pipe 26 has an external gear 24 driven by teeth 25 of the drive shaft of the electric motor 26 . The electric motor 26 provides a constant rotation of 1.5 revolutions per minute of the sample head when the outlet tube 15 from the head is friction-fitted into the inlet tube 23. The diaphragm pump 17 has a flow rate of 3 liters per minute through a filter, and the operation of the diaphragm pump 17 is controlled by a gas flow meter 27 connected to the outlet side of the pump and controlled by a voltage regulator (not shown).
monitored by. Power for the diaphragm pump 17 and electric motor 48.26 is supplied by a battery pack 28.

The filter device 4 containing new r-paper is weighed and attached to the sample head, and then attached to the inlet tube 23 and placed in the appropriate location.

For example, the sampler can be suspended at head height in the workplace. Dia 7 ram bomb 17 and electric motor 18.
26 is switched on and operation of the diaphragm pump 17 can be verified by looking at the gas flow meter 27.

After the required time, preferably after a change of work, the sampler is switched off and, at a suitable time and place, the sample head is disassembled, the filter device is removed and the sample head is reweighed as a whole. Preferably, the filter device can be allowed to stabilize overnight prior to initial metering and before being re-weighed in a controlled environment such as an equilibration chamber.

Figure 3 shows the distribution results considered by Vincent and Arm Plaster in relation to wind speed changes at wind speeds of 1 m/s and 6 m/s compared to the Vincent and Arm Plaster curve with dashed lines. Figure 3 shows the results of the inhalation effect A as a function of aerodynamic particle diameter obtained using a sampler. The results from the sampler show good reproducibility and the closest results obtained using a human head model.

For use in underground coal mines, at least the exposed portion of the sampler is made of a suitable metal, such as steel or red snapper, and attention is paid to the inherent safety of the electrical equipment used.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a sample head with a filter according to an embodiment of the present invention, Fig. 2 is a schematic diagram of the embodiment without the sample head of Fig. 1, and Fig. 6 is a Vincent arm. 3 is a curve diagram showing the test results of the sampler of FIGS. 1 and 2 compared to a plaster bend leg; FIG. In the figure, 1, 2; shell part, 6; slot part, 4; filter device, 5; upper part, 6; inlet, 7; lower part, 8; r paper, 10; grid, 11; outlet, 13
; Lid, 14; O-ring, 15; Outlet pipe, 16; Stand, 17
;Diaphragm pump, 18.26;Electric motor, 19,2
1; Pipe, 20; Air chamber, 22; Spring, 23; Inlet pipe, 2
4; External gear, 25; Teeth, 27; Gas flow meter, 28; Battery bag. r7-77=,. Patent applicant's agent Teru Soga Do 1" 1 Hee-FIG, 2

Claims (1)

[Claims] 1. A filter capable of collecting all dust particles in a passing gas sample, an inlet with a protruding lip that communicates with the filter, and a gas outlet that communicates with the filter and with a gas suction device. A portable sample collector comprising: a sample head; and a drive device that engages the sample head to provide continuous rotational operation of the sample head. 2. The sample collector according to claim 1, characterized in that the filter is installed in a filter device that is removable from the sample head. 3. Sample collector according to claim 2, characterized in that the filter device is a sealable device with a replaceable filter and has a lipped inlet as part of the filter device. 4. The sample collector according to any one of claims 1 to 3, characterized in that a sample head is attached to the top of the main body which has a gas suction device and a driving device built therein. 5. A method for inspecting all dust using the sample collector according to any one of claims 1 to 4. 6. Weigh the filter device with a built-in filter in advance and attach it to the sample head, suck the atmosphere through the filter, sample the atmosphere, and continuously rotate the sample head, and remove the filter device at the end of sample collection. 6. A method according to claim 5, characterized in that the amount is weighed again.