FI60600C - AIR CONDITIONER FOR GASANALYSATOR - Google Patents

Description

F5Sr * l γβΊ m1vAdvertisement

JSlA IBJ O ') UTLAGGN I NGSSKRI FT lUDUU

c (45) "^ - ^ · ίο: η Loos ^ v ^ (51) Kv.ik.3 / i« .ci.3 F 16 T 1/00 FINLAND I —FI N LAND (M) Ptt «nttih« k * mut - Pat * nttns6knin | 7 91769 (22) H »k * mlipU» l - AiMÖknlngadtg 01.0 6.79 '* (23) Alkupilvt — Giltlfh «t * dag 01.06.79 (41) Tullut lulklMkal - Bllvlt affantllg Q2 go

Patent and Registration Office .... .... . ,. ,,.

. (44) Date of issue and date of issue. -, n β.

Patent-och registerstyrelsen '' Aniekan utltjd och utl. -

Finland (PI) (72) Matti Antton Hakala, Helsinki, Antti Lauri Juhani Martikainen,

Helsinki, Jorma Juhani Auvinen, Nummela, Finland-Finland (FI) (7L) Leitzinger Oy (5! +) Gas analyzer water separator - Vattenavskiljare för gasanalysator

The invention relates to a water separator for a gas analyzer, comprising a pipe for passing a gas sample to a water separator having a water separation chamber through which the gas to be measured is arranged to be led and which chamber is arranged to be drained of condensed water.

For example, when using a CC4 analyzer to measure breathing air, the problem is the water vapor contained in the exhaled air. Since the temperature in the sample channel is lower than the human body temperature, water vapor condenses in the measuring device and the entry of water droplets into the measuring chamber causes the measurement to fail.

Known gas analyzers have a water separator used to remove water from the sample gas, in which the condensate is collected in a small cup, which is emptied if necessary. This known solution has the following drawbacks. The collection cup causes extra volume in the sample passage, which slows down the measurement. This is not desirable because the analyzer must be able to monitor the CCl concentration at different stages of the respiration cycle. For this reason, care must be taken to keep the volume of the cup small, which in turn causes a frequent need to empty. If the discharge is not remembered 2 60600 performed within the time limit, the result of the measurement failure.

The object of the invention is to provide an automatically draining water separator with which the above-mentioned problems can be solved.

A particular object of the invention has been to substantially reduce the extra volume in the sample passage, whereby the amount of sample can be reduced without the mixing of the sample gas in the passage causing a considerable slowdown of the measurement, while maintaining sufficient water separation efficiency. Efforts have also been made to maximize reliability and ease of use.

In order to achieve the object and objects of the invention, the gas analyzer water separator according to the invention is characterized in that in the water separation chamber the sample flow is branched into two to an upper, interconnected chamber portion, wherein a sample inlet tube and a side flow tube are connected to the lower portion of the water separation chamber.

In a preferred embodiment of the invention, the main flow pipe is associated with {. ' to the upper chamber part and the side flow pipe opens as is known per se together with the suction pipe connected to the pump to a detachable or otherwise drained condensate collecting vessel, through which the side flow-producing vacuum acts on the pipe connected to the lower part of the water separation chamber.

In this case, the condensate water does not have to pass through the pump, and cheap commercially available diaphragm pumps, which are available in pairs pre-built in the same housing, can be used as both main and side flow pumps. The main and side flow ratios can be adjusted with chokes arranged in front of or after the pumps. In order that the side flow does not substantially affect the amount of sample, the side flow is considerably smaller, preferably about 5% of the total sample flow.

3 60600

The chamber parts themselves can be made extremely easily from the manufacturing technique by forming them on the interface of two gas-tight pieces so that, for example, conical recesses are made in each piece. A removable condensate collection container can be attached to one of these pieces, e.g. with a thread.

The invention will now be illustrated with reference to the accompanying drawing, which shows a water separator according to the invention connected to a gas analyzer (not shown), of which only the measuring chamber 8 is shown.

The gas sample is introduced from the patient 1 through the pipe 2 to the part 5a of the water separation chamber, where it is divided into two partial flows. The main flow is sucked by the pump 9 through the chamber part 5b, the pipe 6 and the measuring chamber 8. About 5% of the sample flow is sucked by the pump 12 through the pipe 10, the water collection vessel 15 and the pipe 11. A water separation chamber is formed on the interface 5c of the two gas-tight bodies 4 and 7 so that a conical recess 5a and 5b is formed in each body 4, 7.

The pieces 4, 7 are aligned with each other so that the cones 5a and 5b are eccentrically relative to each other. The outflow side flow of water starts from the tip of the lower cone 5a to which the pipe 10 joins. The inlet of the sample, i.e. the opening point of the tube 2, is at the same point in the upper half 7. The outflow of the main sample flow, on the other hand, takes place from the top of the upper cone 5b to which the pipe 6 joins.

With the structure described above, it is achieved that the water droplets entering the chamber part 5a are naturally directed to the downward flow into the pipe 10. In this case, the volume of the chamber parts 5a, 5b can be made very small and thus no sample mixing slows down.

Pumps 9 and 12 are standard diaphragm pumps. In this case, a commercially available solution has been used, in which both pumps are housed in the same housing 17 and consist of two diaphragms whose movement is controlled by the same electromagnet. The flows are adjusted to suit the chokes 16 located on the outlet side of the pumps.

The water collection container 15 may be a transparent plastic or glass bottle 60600 threadedly attached to the lower chamber body 4 and removable for emptying. The size of the collection container 15 can be selected to the desired size without adverse effects on the measurement, thus allowing the collection container to be substantially extended.

Claims (7)

60600 A water separator for a gas analyzer, comprising a pipe (2) for conducting a gas sample to a water separator having a water separation chamber through which the gas to be measured is arranged to be conducted and drained from the condensate accumulated therein, characterized in a sample flow partial flow (6, 10) such that the main flow (6) is sucked through the measuring chamber (8) by a pipe (6) connected to the upper part of the water separation chamber and a multiple smaller side flow is continuously sucked through a pipe (10) connected to the lower part of the water separation chamber; to the associated chamber part (5a, 5b), wherein a sampling inlet pipe (2) and a side flow pipe (10) are connected to the lower part (5a) of the water separation chamber. Water separator according to Claim 1, characterized in that the side flow pipe (10) opens, as is known per se, together with the suction pipe (11) connected to the pump (12) into a removable or otherwise drained condensate collection vessel (15). a tube (10) connected to the lower part (5a). Water separator according to Claim 1 or 2, characterized in that the main flow and side flow pumps (9, 12) are diaphragm pumps. Water separator according to Claim 1 or 2, characterized in that the main flow pump (9) is a diaphragm pump and the side flow pump (12) is a peristaltic hose pump. Water separator according to Claim 3, characterized in that the suction or discharge side of the pumps (9, 12) have chokes (16) for adjusting the main and side flow rates and the mutual ratios. Water separator according to claim 1, characterized in that the two chamber parts (5a, 5b) of the water separation chamber are in the form of convexities 660600 offset in opposite directions, the side flow tube (10) opening from below to the tip of the lower cone (5a) and the main flow tube (6) opens from above to the tip of the upper cone (5b), the bottoms of the cones overlapping at their edge portions to form a connection between the chamber portions (5a, 5b). Water separator according to Claim 1, characterized in that the two chamber parts (5a, 5b) of the water separation chamber are formed as recesses in the interfaces (5c) of the two gas-tight bodies (4, 7).