Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1995-02-17
1996-05-14
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Expansible chamber
73262, G01F 320
Patent
active
055157220
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a dry gas meter of the kind in which flexible diaphragms work back-and-forth in chambers to which the gas being metered is alternately admitted and exhausted. Such meters will be termed hereinafter "meters of the kind described".
2. Discussion of the Prior Act
Conventionally meters have had their working parts located in an external casing. For example DE-A-1473042 shows upper and lower external casing parts secured together by flanges adjacent the midheight of the meter and enclosing all the meter parts. Similarly DE-A-2756163 shows meter parts which are intended to be included in an external casing. DE-C-733288 shows a simple meter which may have no external casing but does not have a unitary core defining first, second and third chambers in accordance with those of the present invention.
FR-A-1466742, which is regarded as the closest prior art, comprises a unitary core defining first, second and third chambers. However, it is not clear that this meter is not intended to have an outer casing and there is no fourth lower chamber and lower cover member.
It is desired that meters of the kind described be made smaller, neater and of simpler construction without loss of strength of durability.
SUMMARY OF THE INVENTION
The invention provides a meter of the kind in which flexible diaphragms work back-and-forth in first and second chambers to which the gas being metered is alternately admitted and exhausted by valve means, the oscillations of the diaphragms being translated through an index drive means for counting to give an indication of the volume of gas which has passed through the meter, the meter being formed by a core providing in one piece the structure for the inner halves of the first and second chambers and also providing a third upper chamber for the valve means and the index drive means; first gasways connecting the first and second chambers to the third chamber; an upper cover for closing the third chamber and defining an outlet means; two separate pan covers attached to the core to complete the first and second chambers; by second gasways defined by the core and extending from adjacent the bottom of the core to the third chamber for connecting a gas inlet means at the bottom of the meter to said third chamber; and wherein the upper cover and a lower cover form the top and bottom respectively of the meter casing with the core and pan covers forming the outer sides of the meter casing, there being no further external casing.
Such a meter can be made small and provides for the quick and easy assembly of the meter, wherein the operation of attaching the pan covers completes the gasway connections to the pans which are otherwise integral in the core. Since no outer casing is needed, the time and difficulty of the assembly is very much reduced.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT
A specific embodiment of the invention is shown in the accompanying drawings, in which:
FIG. 1 is an exploded perspective view of the main components of a gas meter,
FIG. 2 is an exploded perspective view of the upper part of the meter of FIG. 1,
FIG. 3 is a vertical section through a central unitary part of the meter of FIG. 1,
FIG. 4 is a horizontal section on the line IV--IV of FIG. 3,
FIG. 5 is a vertical section on the line V--V of FIG. 3, and
FIG. 6 is an exploded perspective view from the upper end of the gas meter of FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The gas meter comprises two chambers (11, 12) each divided vertically by a flexible diaphragm (13) so that gas being measured may be alternately admitted and exhausted from either side of the diaphragm, causing it to oscillate back-and-forth. As is usual, the oscillations of the diaphragm are counted to provide a measure of the volume of gas which has passed through the meter.
As seen best in FIG. 1, the meter body is defined by a unitary core (15) which is a complex aluminium die casting providing structure functioning as the meter casing, inner gas ch
REFERENCES:
patent: 1804596 (1931-12-01), Dickinson
patent: 2619940 (1952-12-01), Leroy
patent: 3808886 (1974-05-01), Goldsberry
patent: 4091668 (1978-05-01), Namikawa et al.
patent: 4593562 (1986-06-01), Carte et al.
Chilcot Richard
Noori Max H.
Smith Meters Limited
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