Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1998-08-03
2000-09-12
Le, Long V.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422 681, 216 33, B10L 300, G01N 110
Patent
active
061173959
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a distributor device, in particular for a chemical analysis arrangement, having at least two plate-like housing parts which lie against each other with respective contact faces, wherein in the contact face of at least one housing part there is provided at least one channel that is covered by the other housing part.
In a known distributor device of that kind, (U.S. Pat. No. 4,607,526), one housing part is in the form of a base plate with a rigid surface, whilst the other housing part is in the form of a flexible cover plate. The cover plate is clamped to the base plate by means of a steel plate. A clamping device which is arranged at the circumference of the base plate and the steel plate is provided for that purpose.
For many chemical analyses, it is necessary for the volume of the channel to correspond relatively accurately to a predetermined value, because the channel volume influences the amount of a fluid that is used in an analysis. In particular, the accuracy becomes increasingly important, the smaller are the volumes of the media to be analyzed.
In the case of the above-mentioned distributor device, the cross-sections of the channel or the channels are poorly defined. These cross-sections are dependent substantially on the force with which the steel plate is pressed against the base plate. This force can be rendered uniform over the entire area of the steel plate only with difficulty, however. There is a risk, for example, that the force will be larger at the clamping points than at other points. There must nevertheless be a certain application force, because otherwise it could no longer be possible to ensure tight sealing of the individual channels.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a distributor device, the channels of which have a volume that is determinable as accurately as possible, which channels are sealed, and which device is inexpensive to manufacture.
In a distributor device of the kind mentioned in the introduction, this problem is solved in that in one of the two contact faces there is provided a recess for receiving a bonding agent, which recess is arranged adjacent to the channel and follows its course.
The bond between the two housing parts is therefore ensured by the bonding agent which is arranged in the recess. The bonding agent at the same time seals the channel. Since the recess follows the course of the channel, the bond between the two housing parts is effected always in the immediate vicinity of the channel, so that compliance with the desired channel cross-section, and thus compliance with the desired channel volume, is largely ensured. At the same time the channel is sealed along its course, so that no undesirable voids into which the fluid can escape from the channel can form. Bonding of two parts by means of a bonding agent arranged in a recess is not novel per se. The Karisruhe nuclear research centre, for example, has put forward a micromembrane pump for conveying gases, in which a membrane is bonded to the appropriate housing parts by injecting an adhesive into a cavity which is provided in a housing part and is covered by the membrane.
The recess is preferably formed in the same housing part as the channel. This simplifies manufacture of the housing parts. One housing part can here possibly remain virtually unmachined.
It is also advantageous when the recess is connected to a feed opening which passes through a housing part. In that case, the bonding agent can be introduced through the feed opening into the recess. It is easier for a suitable connection for the supply of the bonding agent to be created on the side of the housing part lying away from the contact face.
It is equally advantageous for the channel to be in connection with connection openings which pass through a housing part. In that case the recess can, for example, surround the channel. It is not necessary to provide connections which open at the front face of the housing parts. This simplifies sealing of th
REFERENCES:
patent: 3726764 (1973-04-01), White
patent: 4911782 (1990-03-01), Brown
patent: 4948442 (1990-08-01), Manns
patent: 5147607 (1992-09-01), Mochida
patent: 5571721 (1996-11-01), Turner
patent: 5755942 (1998-05-01), Zanzucchi et al.
Hansen John Thrane
Kristensen Steen Gaardsted
Ploug Ole
Schubert Jakob B.o slashed.gh
Stenstr.o slashed.m Theiss
Danfoss A/S
Le Long V.
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