GB2075691A - Fluid flow meters - Google Patents
Fluid flow meters Download PDFInfo
- Publication number
- GB2075691A GB2075691A GB8027829A GB8027829A GB2075691A GB 2075691 A GB2075691 A GB 2075691A GB 8027829 A GB8027829 A GB 8027829A GB 8027829 A GB8027829 A GB 8027829A GB 2075691 A GB2075691 A GB 2075691A
- Authority
- GB
- United Kingdom
- Prior art keywords
- indicating mechanism
- sealing
- mechanism housing
- water meter
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 51
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- HOKDBMAJZXIPGC-UHFFFAOYSA-N Mequitazine Chemical group C12=CC=CC=C2SC2=CC=CC=C2N1CC1C(CC2)CCN2C1 HOKDBMAJZXIPGC-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/007—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus comprising means to prevent fraud
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
- F16B41/005—Measures against unauthorised operation of bolts, nuts or pins
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/10—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission
- G01F1/12—Adjusting, correcting, or compensating means therefor
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
A Woltmann-type water meter includes an adjustment screw 9 normally covered by a plate 18 secured in place by bolt 5c. To prevent unauthorised tampering a wire loop 16 is passed through the heads of bolt 5c and another bolt 13b and closed by a lead seal 17. Adjustment can be made easily by removing only the seal and bolt 5c, then sliding plate 18 radially. <IMAGE>
Description
SPECIFICATION
Woltmann water meter
The invention relates to a Woltmann water meter. Such meters are known in the most
varied constructions. In one known form of
construction, the meter comprises an indicat
ing mechanism with a sealing plate separating
the dry part from the wet part, the indicating
mechanism housing which carries the measur
ing mechanism being provided with a trans
parent cover for the instrument dial of the
measuring mechanism. This cover is releas
ably connected to the indicating mechanism
housing by head screws, the shafts of which
penetrate through bores in the indicating
mechanism housing, and their thread part
being fixable in the sealing plate.It is further
provided with an adjustment screw accessible
from the dry side and connected to the adjust
ment vane in the wet part, the adjustment
screw penetrating through the sealing plate
and projecting into a recess in the indicating
mechanism housing. Finally, further head
screws are provided, the heads of which en
gage in recesses in the housing, the shafts of
which pass through the sealing plate and the
thread parts of which are fixable in the mea
suring assembly.
In order to prevent unauthorised tampering
of the indicating mechanism and measuring
assembly, and unauthorised operation of the
adjustment screw, a certain number of secu
rity means, namely lead security seals, have
to be provided which operate independently
of each other. This increase not only the
manufacturing costs of such an instrument,
but also makes a large number of operations
neccesary when authorised work has to be
carried out on the parts which are normally
sealed when in operation, e.g. in the case of
repairs or new adjustments.
This is the origin of the basic idea of the
invention. The object of the invention is to so
improve a water meter that only a few opera
tions are necessary for loosening the security
seals of the parts which are normally sealed in
operation, and the constructional cost for
these security seals is a minimum.
This object is attained in the instrument of
the described type, in that one of the head
screws which are fixable in the sealing plate
and one of those which are fixable in the
measuring assembly are in the form of sealing
screws, and a security device is provided
which gives free access to the adjustment
screw only when the sealing screw fixable in
the sealing plate is in its extracted position,
the sealing wire of the lead security seal being
passed through the heads of both the sealing
screws.
In a further embodiment of the invention,
the security device consists of a slider mov
able into two end positions, and which covers the recess in the indicating mechanism housing at the access end of the adjustment screw when in the position (first end position) in which the sealing screw fixed in the sealing plate is in its operating position, and uncovers it when in the position (second end position) in which this sealing screw is extracted.
Appropriately, the slider is disposed in a recess provided in that face of the indicating mechanism housing which faces the instrument dial cover. The slider then carries an appendix which lies against a respective associated stop when in the two end positions.
Advantageously, a recess is provided in the indicating mechanism housing in the region of the bore which receives the shank of the sealing screw, for receiveing the lead portion of the lead security seal.
According to a further characteristic of the invention, a channel is provided in the indicating mechanism housing for receiving the sealing wire of the lead security seal, and which connects the recess for receiving the lead portion of the lead security seal to the recess which receives the screw head of the sealing screw.
A cover is provided on the indicating mechanism housing for shielding the lead portion of the lead security seal from the outside.
According to a particular embodiment of the
Woltmann water meter of the invention, in which the indicating mechanism housing is substantially in the form of a truncated cone, and in the surface thereof there is disposed a window-shaped recess for receiving a rectangular identification plate, the identification plate engages by means of one of its longitudinal edges in a rear slot in the surface, a groove which receives the other longitudinal edge being provided in the under-side of the instrument dial cover for protecting the identification plate against unauthorised release.
By means of the measures according to the invention, the security devices are restricted to a minimum, so that in the case of repair or new adjustment, the protected parts of the instrument can be released and removed or replaced with only a few operations.
One embodiment of the Woltmann water meter according to the invention is described in greater detail hereinafter with reference to the drawing, in which, in purely diagrammatic manner:
Figure 1 is an exploded view of the indicating mechanism of the Woltmann meter according to the invention,
Figure 2 is a section on the line ll-ll of Fig.
1,
Figure 3 is a section on the line Ill-Ill of
Fig. 1,
Figure 4 is an isometric representation of the indicating mechanism with the cover of the Woltmann meter according to the invention fitted thereon.
Fig. 1 of the drawing is an exploded repre sentation of the indicating mechanism of the
Woltmann water meter, i.e. the so called "dry-side", whereas the so-called "wet-side" of the instrument is not represented, both for clarity and also because it is of known type.
The wet side consists in known manner of the housing for the water metering mechanism, into which the indicating mechanism is inserted. In the housing of the water metering mechanism an impeller is disposed, to which the liquid, e.g. water, of which the quantity is to be measured is fed through a duct in the housing. A worm is disposed on the impeller axle, and engages with a worm gear disposed on a shaft. This shaft is connected by gear set to a drive shaft, which acts on the measuring mechanism.
The reference numeral 1 indicates the transparent cover of the instrument dial, 2 of the housing containing the measuring mechanism. This latter housing is substantially in the form of a truncated cone, with the instrument dial being fitted on the upper face 2a but being shown on the drawings for reasons of clarity.
A sealing plate 3 is disposed below the housing 2 of the indicating mechanism for separating the dry side of the instrument from the wet side.
The transparent cover 1 is releasably connected to the indicating mechanism housing 2 by head screws 4, 5, the shafts 4a, 5a, of which pass through bores 6, 7 in the indicating mechanism housing 2, their threaded portions 4b, 5b being screwed into corresponding threaded bores 8 in the sealing plate 3.
The reference numeral 9 indicates an adjustment screw, which is connected to the adjustment vane in the wet part. As the wet part is not further illustrated in the drawing, being known, the adjustment vane is also not shown on the drawing. The adjustment screw 9 passes through the sealing plate 3 and carries at its dry end a slot 9a for receiving a screwdriver or the like. The adjustment screw 9 projects into a recess 10 in the indicating mechanism housing 2, and which is aligned with a corresponding recess 11 in the transparent cover 1.
The reference numerals 12, 1 3 indicate further head screws, the heads 1 2a, 1 3a of which engage in recesses 14 in the indicating mechanism housing 2, the shafts 1 2b, 1 3b of which pass through bores 1 5 in the seal plate 3, and the threaded portions 1 2c, 1 3c of which are fixable in the measuring assembly, which is not shown.
As the drawing clearly shows, the two head screws 5 and 1 3 are in the form of sealing screws, the sealing wire 1 6 of the lead security seal containing the lead 1 7 being passed through the heads Sc and 1 3a of the two head screws 5 and 1 3. For this purpose, corresponding bores are provided in the heads Sc and 13a.
The reference numeral 1 8 indicates a safety device, which gives access to the adjustment screw 9 only when the head screw 5 in the form of a sealing screw is in its extracted position. This security device 18 consists of a slider which can be moved into two end positions, and which in the positiawhwn in
Fig. 1 of the drawing (first end position) corresponding to the operating position of the head screw 5 in the form of a sealing screw covers the recess 10 in the indicating mechanism housing 2 at the access end of the adjustment screw 9, whereas when in the position in which this head screw 5 is extracted (second end position), it uncovers said recess.
The security device in the form of the slider is for this purpose disposed in a recess 1 9 provided in that face of the indicating mechanism housing 2 which faces the cover 1 of the instrument dial. The slider comprises an appendix 1 8a which hits against a respective associated stop 20 and 21 in the two end positions.
A recess 22 for receiving the lead portion 1 7 of the lead security seal is provided in the indicating mechanism housing 2 in the region of the bore 7 which receives the shaft 5a of the head screw 5 in the form of a sealing screw.
A channel for receiving the sealing wire 1 6 of the lead security seal is provided in the indicating mechanism housing 2, and connects the recess 22 which receives the lead 1 7 of the lead security seal to the recess 4 which receives the screw head 1 3a of the head screw 1 3 which serves as the sealing screw.
As shown in Fig. 4 of the drawing, a cover 24 which shields the lead portion 17 of the lead security seal from the outside is disposed on the indicating mechanism housing 2. For this purpose, the cover 24 is in the form of a truncated cone, such that when the cover 24 is in its closed position, the surface thereof lies tightly on the surface of the indicating mechanism housing 2.
As can be seen Fig. 1 of the drawing, the indicating mechanism housing 2 is substantially in the form of a truncated cone. A window-shaped recess 25 is provided in the surface itself for receiving a rectangular identification plate 26 (Fig. 3). The identification plate 26 engages with one of its longitudinal edges 26a in a rear slot 27 (Fig.3) in the surface of the truncated conical indicating mechanism housing 2, a groove 28 (Fig. 2) being provided in the lower side of the cover 1 of the instrument dial to take the longitudinal edge 26b for protection against unauthorised release of the identification plate 26.
When the cover 1 of the instrument dial is connected to the indicating mechanism housing 2, it is only possible to release the identification plate 26 if this latter is destroyed.
In describing the method of operation of the security seal for the parts which are normally to be sealed in such instruments, reference should be made to the exploded view of Fig.
1:
The cover of the instrument dial is firstly connected to the indicating mechanism housing 2, and this latter is then connected to the sealing plate 3. This is done with the aid of the head screws 4 and 5, which are passed through the recesses 1 a in the instrument dial cover 1, and through the bores 6, 7 in the indicating mechanism housing 2, the threaded portions 4b and 5b engaging in the threaded bores 8 in the sealing plate 3. The head screw 5 can be inserted into the bore only if the safety device 1 8 is in the position shown in
Fig. 1, in which it uncovers the bore 7, whereas the recess 10 in the indicating mechanism housing 2 is closed from above. By this means, the adjustment screw 9 which engages in said recess 10 is inaccessible.When the three parts 1, 2 and 3 are connected together, it is also impossible to release the identification plate 26.
After connecting together the three parts 1-3, the head screws 12 and 13 are inserted into the bores 15 in the sealing plate 3, the threaded portions of the head screws 1 2 and 1 3 being fixed into corresponding threaded portions in the measuring assembly. The heads 12a, 1 3a of the head screws 12, 1 3 then engage partly in the recesses 14. The fitting and laying of the sealing wire 1 6 can then be commenced. For this purpose, the wire 1 6 is passed through the two bores 5d in the head 5a of the head screw 5, and through the two bores 1 b in the transparent cover 1.
The sealing wire 1 6 is then also passed through the two bores 1 3d in the head 1 3a of the head screw 13, the channel 23 then serving for receiving the sealing wire 1 6. The two ends of the sealing wire 1 6 are then provided with the lead portion 17, which lies in the recess 22. Finally, the cover 24 is swivelled into its closed position, so that the lead portion 1 6 is shielded from the outside.
The important aspect of the Woltmann water meter according to the invention is that the sealing of those parts of this meter which normally have to be sealed against unauthorised tampering is carried out with only a few elements and operations. In this respect, it must not be overlooked that the head screws 5 and 1 3 which act as the sealing screws differ from normal head screws only by the recesses 5d and 13d, and that normal head screws are also necessary in the case of conventional instruments. If the lead security seal is disregarded, then those parts which normally have to be sealed are in fact basically sealed only by the security device, which is in the form of a simple slider, and which is extremely simple both to manufacture and to assemble.
The parts 1-3 are disassembled in an analogous but reverse manner.
Claims (9)
1. A Woltmann water meter with an indicating mechanism, consisting of a sealing plate separating the dry part from the wet part, the indicating mechanism housing which carries the measuring mechanism, and a transparent cover for the instrument dial of the measuring mechanism, this cover being releasably connected to the indicating mechanism housing by head screws, the shafts of which penetrate through bores in the indicating mechanism, and the thread parts of which being fixable in the sealing plate, there being provided an adjustment screw accessible from the dry side arconnected to the adjustment vane in the wet part, and passing through the sealing plate and projecting into a recess in the indicating mechanism housing, further head screws being provided, the heads of which engage in recesses in the indicating mechanism housing, the shafts of which pass through the sealing plate, and the threaded portions of which are fixable in the measuring assembly, characterised in that one of the head screws which are fixable in the sealing plate (3) and one of those which are fixable in the measuring assembly are in the form of sealing screws (5 and 13), a security device (18) being provided which gives free access to the adjustment screw (9) only when the sealing screw (5) fixable in the sealing plate (3) is in its extracted position, the sealing wire (16) of the lead security seal being passed through the heads (5c and 13a) of both the sealing screws (5 and 13).
2. A water meter as claimed in claim 1, characterised in that the security device (18) consists of a slider movable into two end positions, and which covers the recess (10) in the indicating mechanism housing (2) at the access end of the adjustment screw (9) when in the position (first end position) in which the sealing screw (5) fixed in the sealing plate (3) is in its operating position, and uncovers it when in the position (second end position) in which this sealing screw (5) is extracted.
3. A water meter as claimed in claim 2, characterised in that the slider is disposed in a recess (19) provided in that face of the indicating mechanism housing (2) which faces the instrument dial cover (1).
4. A water meter as claimed in claim 2 and 3, characterised in that the slider carries an appendix (18a) which lies against a respective associated stop (20 and 21) when in the two end positions.
5. A water meter as claimed in claims 1 to 4, characterised in that a recess (22) is provided in the indicating mechanism housing (2) in the region of the bore (7) which receives the shank (5a) of the sealing screw (5), for receiving the lead portion (17) of the lead security seal.
6. A water meter as claimed in claims 1 to 5, characterised in that a channel (23) is provided in the indicating mechanism housing (2) for receiving the sealing wire (16) of the lead security seal, and which connects the recess (22) for receiving the lead portion (17) of the lead security seal to the recess (14) which receives the screw head (13a) of the sealing screw (13).
7. A water meter as claimed in claims 1 to 6, characterised in that a cover (24) is disposed on the indicating mechanism housing (2) for shielding the lead portion (17) of the lead security seal from the outside.
8. A water meter as claimed in claims, 1 to 7, in which the indicating mechanism housing is substantially in the form of a truncated cone, and in the surface thereof there is disposed a window-shaped recess for receiving a rectangular identification plate, characterised in that the identification plate (26) engages by means of one of its longitudinal edges (26a) in a rear slot (27) in the surface, a groove (28) which receives the other longitudinal edge (26b) being provided in the under-side of the instrument dial cover (1) for protecting the identification plate (26) against unauthorised release.
9. A water meter substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803017111 DE3017111C2 (en) | 1980-05-03 | 1980-05-03 | Woltmann water meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2075691A true GB2075691A (en) | 1981-11-18 |
| GB2075691B GB2075691B (en) | 1984-06-13 |
Family
ID=6101607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8027829A Expired GB2075691B (en) | 1980-05-03 | 1980-08-28 | Fluid flow meters |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS604407B2 (en) |
| DE (1) | DE3017111C2 (en) |
| FR (1) | FR2481796A1 (en) |
| GB (1) | GB2075691B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2597649A1 (en) * | 1986-04-21 | 1987-10-23 | Sappel Sa | DEVICE FOR MAKING A VOLUMETRIC METER INVIOLABLE |
| EP1536213A2 (en) * | 2003-11-14 | 2005-06-01 | Elster Messtechnik GmbH | Labelling ring for watermeter |
| GB2448948A (en) * | 2007-05-04 | 2008-11-05 | Jason Davies | A shroud for a water meter |
| FR2961567A1 (en) * | 2010-06-22 | 2011-12-23 | Addax Srl | Anti-theft device for protecting nut in gas pipeline to prevent unauthorized operation of nut, has engagement unit passing to inner side of confinement housing and arranged to be in contact with operating unit of nut |
| EP4375624A1 (en) * | 2022-11-28 | 2024-05-29 | Landis+Gyr GmbH | A housing for enclosing a measurement part of a fluid flow meter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1149179B (en) * | 1956-03-26 | 1963-05-22 | Frantisek Kral | Adjustable Woltmann flow meter for liquids |
| DE1030624B (en) * | 1957-01-17 | 1958-05-22 | Licentia Gmbh | Safety device for wire ends fixed by screws against unauthorized loosening |
| DE1173679B (en) * | 1961-05-22 | 1964-07-09 | Presna Mechanika Narodny Podni | Flow meter with adjustable damper serving as a flow regulator |
| GB976236A (en) * | 1961-05-22 | 1964-11-25 | Presna Mechanika | Improvements in or relating to velocity flow meters |
-
1980
- 1980-05-03 DE DE19803017111 patent/DE3017111C2/en not_active Expired
- 1980-08-05 JP JP10683380A patent/JPS604407B2/en not_active Expired
- 1980-08-28 GB GB8027829A patent/GB2075691B/en not_active Expired
- 1980-09-16 FR FR8019899A patent/FR2481796A1/en active Granted
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2597649A1 (en) * | 1986-04-21 | 1987-10-23 | Sappel Sa | DEVICE FOR MAKING A VOLUMETRIC METER INVIOLABLE |
| EP0243226A1 (en) * | 1986-04-21 | 1987-10-28 | SAPPEL Société Anonyme française | Device to make a volumetric meter secure |
| EP1536213A2 (en) * | 2003-11-14 | 2005-06-01 | Elster Messtechnik GmbH | Labelling ring for watermeter |
| EP1536213A3 (en) * | 2003-11-14 | 2007-02-28 | Elster Messtechnik GmbH | Labelling ring for watermeter |
| GB2448948A (en) * | 2007-05-04 | 2008-11-05 | Jason Davies | A shroud for a water meter |
| GB2448948B (en) * | 2007-05-04 | 2012-11-28 | Jason Davies | Shroud |
| FR2961567A1 (en) * | 2010-06-22 | 2011-12-23 | Addax Srl | Anti-theft device for protecting nut in gas pipeline to prevent unauthorized operation of nut, has engagement unit passing to inner side of confinement housing and arranged to be in contact with operating unit of nut |
| EP4375624A1 (en) * | 2022-11-28 | 2024-05-29 | Landis+Gyr GmbH | A housing for enclosing a measurement part of a fluid flow meter |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2075691B (en) | 1984-06-13 |
| FR2481796B1 (en) | 1985-01-25 |
| JPS573009A (en) | 1982-01-08 |
| DE3017111A1 (en) | 1981-11-05 |
| JPS604407B2 (en) | 1985-02-04 |
| FR2481796A1 (en) | 1981-11-06 |
| DE3017111C2 (en) | 1986-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |