Sep 12 2015

And removable horizontal Woltman type water meter series screw rotor dry type water meter

Woltman type water meter series

Definition:
Woltman type water meter, also known as v Terman (Woltmann) water meter belongs to the velocity type meter, including horizontal Woltman type (Turbo water meter),
Vertical Woltman type and removable horizontal Woltman type III categories.
Working principle:

When water flows after the water meter along the axis direction of impeller rotation impact Woltman type water meter discharge, impeller speed is proportional to the flow velocity,
After through deceleration gear transmission, indicates whether the device displays the total amount of water through a water meter. The Woltman type rotor with level swirling flow direction.
Main features:
1. dry-type, magnetic drive;
2. counter vacuum sealed, anti-condensation of fog, can be maintained long-term reading is clear;
3. the flow capacity, pressure loss;
4. is especially suitable for industrial use;
5. can provide the originating device according to customer needs;
6. the specifications in line with GB/T778.1~3-1996 (the equivalent of ISO4064) b-grade standard.
Conditions of use:
Water temperature ≤ 45 ℃ (≤ 90 ℃ hot water) pressure 1MPa
Maximum permissible error:
From the minimum flow (including Qmin) to the boundary flow (no including Qt) ± 5%
From the boundary flow (including Qt) to the overloaded traffic (including QS) high as ± 2% (water table is ± 3%)
Removable horizontal screw rotor dry type water meter
Features:
1. dry-type, magnetic drive
2. counter vacuum sealed, anti-condensation of fog can keep clear readings
3. using removable structure, easy installation and maintenance
4. measurement versatility
5. the flow capacity, and less pressure loss
6. According to the customer needs can provide the originating device
7. the specifications in line with GB/T778.1~3-1996 (the equivalent of ISO4064) b class

Source: http://asmeter.com/

Sep 07 2015

WS-50~200 vertical Woltman type water meter

Uses:

This meter is used to measure the amount of water flowing through the water pipes are not suitable for corrosive liquids.
Conditions of use:
Temperature class: T30 pressure rating: MAP10 pressure loss: δ P63 upstream flow field sensitivity level: U5 downstream flow field sensitivity level: D3
Maximum permissible error:

A) low (Q1 ≤ Q<Q2) maximum permissible error is ± 5% b) higher (≤ Q ≤ Q2 Q4) the maximum permissible error is ± 2%
Features and technical parameter:
Features:
1. superior performance of small flow: vertical Woltman type impeller, stainless steel ball as support, so that the friction to a minimum. Laundry, toilet, shower water to households, also WS150 water meter records.
2. anti-fouling performance: built-in stainless steel strainer/colander, eliminating the need for separate cost and trouble of installing filters. Online structural design of detachable, so that the water meter maintenance to a minimum. Water meter in water environment working under harsh conditions and, if necessary, pull the full movement at the installation site, quick clean up debris.
3. measurement measuring range: Woltman type is greater than the nominal diameter of impeller, enabling it to withstand greater flow, low flow performance, range than natural expanded greatly, actually up to 200~350 times.
4. long service life: low revs of the impeller design at both ends of the friction pairs is corundum-stainless steel ball-corundum-carbon wear-resistant plastic,-carbide-alumina-carbon fiber-wear-resistant plastic, especially the wear of ball is not a fixed point, which can ensure the measurement performance for a long time.
5. water meter before and after the straight pipe requirement greatly reduced, install easily in narrow spaces.
6. wet clear liquid seal structure reading and good sensitivity, magnetic and magnetic dry-type structures, mainly for export and transmission purposes.
7.WS type water meter specifications overall superior to rotor type water meter, which belongs to the best replacement product. No extra flow can replace horizontal Woltman type water meter, increases recovery rate. WS-meter length with two case series, facilitate the transformation of the old network.
8. technical parameters of the meter in accordance with the national standard GB/T778.1~3-2007 (ISO4064-1~3:2005,IDT) requirements.

Source: http://asmeter.com/

Sep 01 2015

Verification regulation of horizontal Woltman type water meter

This regulation applies to new manufacture, use and repair of horizontal Woltman type water meter hereinafter meter) test.

A, technical requirements
1 meter of permissible error of indication shall conform to the following provisions:
1. 1 minimum to maximum flow between 10% (not including the 10%-point) is ± 5%.
1. 10% to maximum flow rate of up to ± 2 maximum flow 2%.
2 meter repeatability requirement does not exceed the meter allows the absolute value of errors.
3 meter mark, direction arrows, nominal diameter number, date of manufacture, marking and instructions, as the basic unit of “M3″.
4 meter appearance should not have obvious defects, on the disc should not scrapes, scratches, cracks, and other ills affecting the reading surface defects of glass should not interfere with reading.
5 meter counter for when the pointer, the pointer should be clockwise rotation, the pointer tip the width should not exceed 0. 8mm, referring to the tip should be able to in the shortest possible dividing range.
When a 6 meter-counter for the drum, counter wheel, digital space should be equal, arrangement height should be consistent, glyphs may not be obvious tilt. Digital fonts in drum height shall be not less than 4mm
7 meter error adjustment device. In case the adjusting hole on side shall be marked with “ten”, “a” symbol.
Parts and fittings of the 8 meter shall not be used to hinder water sanitation materials, and shall have sufficient strength. And resistant to water and atmospheric corrosion, or have a reliable corrosion protection layer.
9 meter should have available to seal the holes.
The maximum permissible working pressure up to 10 meter 10kgf/cm2, should also be able to 1. 5 times times the maximum allowable working pressure and water pressure test for strength of not less than 3 minutes, without any leakage.
Second, testing conditions
11 meter test devices for all standard, or standard table of workload can be, no matter what device, in a flow of a verification process, the water meter must be run continuously.
12 volume check timing, should be equipped with commutator. Commutator should be synchronized with the start-reading meter.
13 test meter testing device must have a valid test certificate. When the volumetric method, the cumulative flow of the device checked meter error shall not exceed permissible error of 1/3. Verification regulation of the cumulative flow error device JJG164-75 of the regulations.
14 verification of indication for water used for liquor, were brought against its minimum value must not be greater than a meter of water of 0. 5%.
15 meter showing the value verification process, you should try to exclude interference around, the water pressure is stable.
16 10% and verification for maximum flow, instantaneous flow indication error of ± 2 to be in traffic. Within 5%, and requested in the verification process, stable indication of instantaneous flow in the appropriate range.
17 water meter installation requirements
17. 1 upstream and downstream of the meter to install the necessary straight pipe or equivalent efficiency of rectifiers. The length of straight pipe upstream of not less than 10D, and raw materials not less than 5D (d is the nominal diameter of the meter).

17. 2 checked regularly by the comparison method, the standard table must be installed according to the technical requirements.
17.3 meter shaft mounting with upstream and downstream straight pipe, gasket not getting into the tube.
18 checked regularly by the comparison method, as a standard sheet of checked water meter error shall not exceed permissible error of one-third. Standard table must be stable and reliable performance, standard tables can be one, can also be connected in parallel several combinations, to meet the need of calibrating meter flow range.
Third, the verification
(A) pick up item
19 meter verification for Visual inspection, value of water pressure strength test, test repeatability and verification.
(B) inspection methods
20 appearance inspection
20. 1 new water meters must conform to the technical requirements of BJ2364-78 standard. Meanwhile, shall conform to the provisions of the present Statute 2-9.
20. 2 meter of repairs should be coated with a reliable protective layer.
21 hydrostatic strength test
New water meters must be hydrostatic strength test method: pressure test meter mounted on the stage, first water excluding water meters in the air, then water static pressure of 1.5 times the maximum allowable working pressure on the water meter lasts not less than 3 minutes there shall be no leakage.
22 repair and periodic checking of the calibration of the meter seal, should ensure maximum pressure without leaking.
23 when the meter indication test using the volumetric method:
23. Recorded for 1 meter of water and water after water meter people the actual workload, and according to the following formula to calculate allowable error of indication for water.
23. 2 installed on the test bench a meter, water meter allows maximum flow of water, remove water pipes listed in the air, and turns the meter pointer is stationary for some time. Then adjust the flow of water to flow under, and workload for the water to zero or a dividing line, start the commutator switch current to hold the human work. Meanwhile, record water meter the starting value. When the meter pointer reaches a predetermined indexing, and then switch the flow, static water level readings for the workload, workload record water meter run and the actual water.
24 each meter shall test the maximum (or rated) 10% flow, maximum flow and minimum flow, shall not exceed the value of its error code provisions of 1th.
25 water accumulated on the provisions on verification of meters minimum-bit pointer operation less than a full circle, and timing of water corresponding to not less than 1 minute. The verification flow, water and the specific requirements of value acceptable errors as shown in appendix table 1.

Max 26 for water sampling (or rated) flow, maximum flow of 10% and minimum flow indication of verification must be carried out twice, each time shall not exceed permissible error of indication and absolute value shall not exceed the meter repeatability tolerances.
27 is indication when using comparison testing of the water meter:
27. 1 should link up the standard and the test meter, each after a certain quantity, compare instructions.
28 if the verification results when there is doubt, verification shall be subject to a higher precision of the device as standard.
Four, calibration results processing
Certified in accordance with the code requirements for water meters, stamped with the seal, issued calibration certificates.
Under normal circumstances, 30, water meter calibration interval of one year. If used less frequently, can also run according to how much water, prolonged, but not more than two years.

Source: http://asmeter.com/

Aug 31 2015

An introduction to horizontal Woltman type water meter

Horizontal Woltman type water meter, also known as Turbo water meter, refers to the kind of meter screw rotor axis parallel to the water pipe axis (or overlap), the impeller screw wing shape. This is not to say that the meter can only be installed horizontally. Of course, if the water meter is required when installed vertically, you should select in the inlet side of the screw shaft bearing bore with gem meter end bearing to reduce friction resistance and prolong the life of the meter. Some imported Woltman type water meter models using dynamic balance technology, can work in horizontal, inclined and vertical position, but in the non-working level meter level to reduce the level of measurement.

Case, cover, table in glass

Case, cover, table in glass and sealing gasket together to form a sealed body, in case water is not to be measured leakage to the outside. According to the standard requirements, 1.6MPa, 15min water meters should be able to withstand water pressure and water pressure 2. OMPa, 1min pressure test. Therefore, table covers and table in the shell, glass should meet the above requirements. Table shell hole should be decorated with lining made of corrosion-resistant materials or coated with good rust coating.
Rectifier
Rectifier effect: one is from upstream in the turbulent state of the water meter flow rectifier in grid-shaped, as far as possible be “grooming” laminar flow; the second is the rectifiers have a hole in the Center to support the screw shaft, the shaft hole and the hole on the bracket should maintain the same shaft, in order to ensure flexible screw wing rotation.
BRACKET
Support role: on the one hand supported screw shaft, flexible rotating screw wing in current action; the other hand through the stent worm gears is meshing with the worm on the screw shaft, speed of screw wing is connected to the upper part of the bracket and count bodies.
Lo Wing
Woltman type water meter water meters using screw-shaped impeller, also known as a screw or wing wheels, general use of sufficient mechanical strength of engineering plastics (ABS) injection molding. Screw the wing tube is hollow to reduce weight and increase buoyancy. Screw one end of the wing has a cap with adhesive bonding, lest they should be measured after water immersion to increase their weight. Lo Wing should have better dynamic balance performance, or at high speeds, easy to screw shaft and bushing wear.
Error adjusting device

Adjusting device there are two common errors.
(1) paddle error adjustment device
Part of this adjustment device is a flat and symmetrical paddle-shaped control plate, located in rectifying plate part of the rectifier. When the rotating paddle-shaped control plate, you can increase or decrease these parts flow on screw rotating impact, so as to error control. Error adjustment of paddle-shaped device has a simple structure, fewer parts and is easily processed and the advantages of easy disassembly, so widely used.
(2) the Steering error adjustment device
Part of this adjustment device is a flat plate, one side of the plate has a hole, put the adjustment plate rectifier rectifier Board part of the shaft. Adjustment error, there is a shaft pulling the rudder adjustment plate on the other side, make the adjustment plate around the axis of rotation, to increase or reduce the impact of this flow on screw rotating, which play a role in error adjustment. The adjusting device structure is more complex.

Source: http://asmeter.com/

Aug 28 2015

Verification regulation of horizontal Woltman type water meter

This regulation applies to new manufacture, use and repair of horizontal Woltman type water meter hereinafter meter) test.

Technical requirements
Permissible error of indication of the meter shall comply with the following provisions:
From minimum to maximum flow between 10% (not including the 10%-point) is ± 5%.
Max 10%-max ± 2%.

Repeatability error of the meter requires no more than a meter allows the absolute value of errors.
Water meter mark, direction arrows, nominal diameter number, date of manufacture, marking and instructions, as the basic unit of “M3″.
Water meter look should not have obvious defects, on the disc should not scrapes, scratches, cracks, and other ills affecting the reading surface defects of glass should not interfere with reading.
Meter counter for when the pointer, the pointer should be clockwise rotation, the pointer tip the width should not exceed 0. 8mm, referring to the tip should be able to in the shortest possible dividing range.
When the meter-counter for the drum, counter wheel, digital space should be equal, arrangement height should be consistent, glyphs may not be obvious tilt. Digital fonts in drum height shall be not less than 4mm
Water meters should have error adjustment device. In case the adjusting hole on side shall be marked with “ten”, “a” symbol.
Water meter replacement parts and fittings shall not be used to hinder water sanitation materials, and shall have sufficient strength. And resistant to water and atmospheric corrosion, or have a reliable corrosion protection layer.
Water meters should be holes for seals.
Water meters of the maximum allowable working pressure is 10kgf/cm2, also should be able to withstand 1. 5 times times the maximum allowable working pressure and water pressure test for strength of not less than 3 minutes, without any leakage.
Test conditions
Meter test devices for all standard, or standard table of workload can be, no matter what device, in a flow of a verification process, the water meter must be run continuously.
Volumetric method timing, should be equipped with commutator. Commutator should be synchronized with the start-reading meter.
Test device for testing water meters must have a valid calibration certificate. When the volumetric method, the cumulative flow of the device checked meter error shall not exceed permissible error of 1/3. Verification regulation of the cumulative flow error device JJG164-75 of the regulations.
Verification of indication for water used for liquor, were brought against its minimum value must not be greater than a meter of water of 0. 5%.
Water meter showing the value verification process, you should try to exclude interference around, the water pressure is stable.
For 10%-and following verification of the maximum flow, instantaneous flow indication error of ± 2 to be in traffic. Within 5%, and requested in the verification process, stable indication of instantaneous flow in the appropriate range.
Water meter installation requirements
Upstream and downstream of the meter to install the necessary straight pipe or equivalent efficiency of rectifiers. The length of straight pipe upstream of not less than 10D, and raw materials not less than 5D (d is the nominal diameter of the meter).
Using comparison method timing, standards must be installed according to the technical requirements.
Water meter shaft mounting with upstream and downstream straight pipe, gasket not getting into the tube.
Using comparison method timing, as the standard error should not exceed third of the tested meter tolerance standards must be stable and reliable performance, standard tables can be one, can also be connected in parallel several combinations, to meet the need of calibrating meter flow range.
Verification
Picking up items
Water meter verification for Visual inspection, value of water pressure strength test, test repeatability and verification.
Verification method

Appearance inspection
Repair of water meters should be coated with a reliable protective layer.
Water pressure test for strength
New water meters must be hydrostatic strength test method: pressure test meter mounted on the stage, first water excluding water meters in the air, then water static pressure of 1.5 times the maximum allowable working pressure on the water meter lasts not less than 3 minutes there shall be no leakage.
After repairs and periodic testing of water meter seal check, should ensure maximum pressure without leaking.
When the meter indication test using the volumetric method:
Will be recorded by the meter of water and water after water meter people the actual workload, and according to the following formula to calculate allowable error of indication for water.
Installed on the test bench a meter, water meter allows maximum flow of water, remove water pipes listed in the air, and turns the meter pointer is stationary for some time. Then adjust the flow of water to flow under, and workload for the water to zero or a dividing line, start the commutator switch current to hold the human work. Meanwhile, record water meter the starting value. When the meter pointer reaches a predetermined indexing, and then switch the flow, static water level readings for the workload, workload record water meter run and the actual water.
Each meter shall test the maximum (or rated) 10% flow, maximum flow and minimum flow, shall not exceed the value of its error code provisions of 1th.
The sampling of water meters maximum (or rated) flow, maximum flow of 10% and minimum flow indication of verification must be carried out twice, each time shall not exceed permissible error of indication and absolute value shall not exceed the meter repeatability tolerances.
Meter shows values when using comparison testing:
Standard table and the test meter should be linked, each after a certain quantity, compare instructions.
The verification results when there is doubt, verification shall be subject to a higher precision of the device as standard.
Verification results
Certified in accordance with the code requirements for water meters, stamped with the seal, issued calibration certificates.
Under normal conditions, water meter calibration interval of one year. If used less frequently, can also run according to how much water, prolonged, but not more than two years.

Source: http://asmeter.com/

Aug 27 2015

Remote water meter in the rotor of water meters and Woltman type water meter where is the difference?

Remote water meter based on different characteristics, the structure consists of many different kinds. Such as rotary-wing water meters and Woltman type. Has a data transfer both water meter, accurate readings, and all Intelligent remote water meter the characteristics, specific structures is quite different. Next, we look at specific differences.

Rotor type water meter: rotary wing type water meter for measurement of the total one-way flow in small diameter pipe. Using calibre 15mm, 20mm pipes of domestic water metering. The water meter is mainly composed of a casing, impeller measurement and reduction gear, and table, has the characteristics of simple structure.
Horizontal Woltman type water meter: horizontal Woltman type water meter for measuring the total amount of water flow pipe. Particularly suited to the needs of water supply mains and large factories, water. Main feature is the large flow capacity, small size, compact structure, easy to use and maintenance.
Rotary-wing water impeller rotation direction perpendicular to the direction of flow is.

Rotor type water meter can be divided into many types are:
Suitable medium: water meter, water meter.
Works can be divided into: wet, dry, liquid, semi-liquid sealing.
Connection: flange connection rotor rotor threaded connection of water meter, water meter.
Installation: horizontal, vertical, rotary wing insertion type water meter, and so on.
Rotor type water meter features: narrow operating range, large size, installation and maintenance of high sensitivity with reduced mobility is mainly used for small diameter pipes, ranging in size from 15mm-150mm.
Horizontal Woltman type water meter impeller rotation direction and the direction of flow is horizontal it is called horizontal Woltman type water meter.
Horizontal Woltman type water meter (Woltman type water meter): horizontal Woltman type water table, horizontal Woltman type water meter, removable horizontal Woltman type water meter (cold and hot).
Horizontal screw wing detachable cold (hot) water meter counter (surface) for dry-not connected with the water pipe water through magnetic means.
Horizontal Woltman type cold (hot) water meter counter (surface) for wet and water pipe water directly connected.
Horizontal Woltman type water meter features: work range, easy installation and maintenance, small size, low sensitivity is mainly used in large-diameter pipes, produced by domestic manufacturers of horizontal Woltman type water meter diameter to 80mm–200mm,250mm–600mm only a handful of big companies.
Qingdao into producing all kinds of remote water meter, including rotor and Woltman type, is the top manufacturer of remote water meter. If you have any remote water meter and to learn more please click on shuiwu.qdies.com to view, if you need to buy remote water meter you can dial 400-0696-700lai order, there will be a special reception.

Source: http://asmeter.com/

Aug 03 2015

The introduction of horizontal Woltman type water meter

Horizontal Woltman type water meter speed meter, suitable for use in large-diameter pipe, which is characterized by large flow capacity, small pressure loss. When water flows after the water meter along the axis direction of impact around the shaft rotation of the impeller discharge, impeller speed is proportional to the flow velocity, after after the transmission the transmission, displays the total quantity of water through a water meter on the indicating device. Woltman type water meter into horizontal Woltman type water meter and horizontal Woltman type water meter type. Domestic uses most of the tables was horizontal Woltman type water meter for industrial use. Horizontal Woltman type water meter, because of its wide range of measuring flow, parts versatility, installation and maintenance can keep water features, such as the case of the split table, was welcomed by the users. Existing horizontal screw wing mainly consists of both ends, respectively, with detachable water meter inlet and outlet of shell, mount, the former after rectifiers, Rectifier, impellers, drive mechanism and located in Mount detachable connections into the count at the top of table. In the presence of water balanced impellers installed and dangling between the diffuser rotating, which means that the smooth running of the impeller on the water meter range, sensitivity, accuracy and throughput capacity, and other important parameters are affected. Once the axles for excessive wear of the impeller, impeller rotation runout will occur, thus seriously affecting the balance of impeller rotation. Therefore, the impeller shaft wear is also particularly important. Horizontal Woltman type water meter in the existing technical concerns about the rotating impeller equilibrium is not obvious, the existing flows of horizontal Woltman type water meter and the precision is difficult to break, become the bottleneck. And existing technology of horizontal Woltman type water meter casing coated with nature and movement is not good, water concentration through the impeller cannot be guaranteed, and someEffect on the flow of water meters and precision.

The technical problem to be solved by the utility: provides a compact impeller equilibrium of good, good movement between shell and coated, flow capacity greater, more accurate horizontal Woltman type water meter.

This practical new solution above problem by used of technology programme for: a level screw wing type meter, including shell and the movement, by said of movement including installation seat, and Qian rectifier, and Hou rectifier, and impeller, and set Yu installation seat top of count table and the connection impeller and count table Zhijian of drive institutions, by said of Qian rectifier and Hou rectifier respectively set Yu by said of installation seat of two investigation took by said of impeller installation Yu Qian rectifier and the Hou rectifier Zhijian formed of cavity body, by said of impeller of side for and impeller a poses forming of first axle, And the impeller and the first axle is made from PP, the first axle the end near the impeller is a cone-shaped, referred to the second axle is installed tight fit on the other side of the impeller, the second axle is used to drive the worm shaft;
It also including two balance block, two balance block respectively set Yu is located in impeller of sides of installation cavity body; each balance block of Central are has for and first axle or second axle phase sets collection of installation hole, each balance block of within surface are has along radial uniform distribution of more article concave slot, and by said of balance block of outside circle of edge at along by said of concave slot of axis direction has and by said of concave slot connected of multiple square hole;
The impeller blade number is 9, the blade pitch is 350 ~ 400mm, wherein the upper part of the blade close to the side of the second side of the axle with inclined surfaces.
Compared with the existing technology, the advantages of the utility: the impeller side of horizontal Woltman type water meter and one-piece molded the first axle of the impeller and impeller and the first axle are made from PP, first near the impeller axle of a cone-shaped end, so that the first axle torsional strength better, more favourable to the rotation of the impeller equilibrium. This practical new also including respectively set Yu impeller of sides of installation cavity body of two balance block, each balance block of within surface are has along radial uniform distribution of more article concave slot, and balance block of outside circle of edge at along concave slot of axis direction has and concave slot connected of multiple square hole such, can guarantee installation Shi of air can along concave slot from square hole smooth excluded, avoid effect impeller of buoyancy, better to guarantee has impeller turned of balance sex. And when the number of impeller blades 9, blade pitch 350 ~ 400mm blade close to the upper side of the side of the second axle with inclined surfaces, and thus more conducive to maintaining rotating impeller equilibrium.

As optimization, by said of seat body of outside week wall along week to package covered has is u shaped of sealed pad, by said of seat body of outside week wall along week to has convex article, sealed pad of within surface has and seat body of outside week wall phase embedded collection of sealed slot; by said of shell Shang has and sealed pad of shape match and for capacity reset sealed pad of installation slot. This seal will be installed completely coated, and the seal between the casing and are better to ensure water concentration through the impeller further ensures the flow capacity and accuracy of water meters.
As preferred, the upper end of the gasket protruding inward bilaterally symmetrical sets of bumps, the bumps on the inner surface is provided with slots, wherein the body bilaterally symmetrical with the seat plate with used with the card slot compatible card. In this way, gasket and mounting of chimeric closer seal better.
As preferred, the drive mechanism includes a worm’s second axle, shaft and sleeve installed in the lower part of the drive shaft and worm gear in conjunction with worm gearing, which connected to the drive shaft with the count at the top of the table.
As preferred, the side of the mounting hole is provided with holes, position the mounting holes on the other side is provided with columns, and the balance of the first block PIN through holes on the impeller mounted on a second orientation of balancing blocks in holes.
As preferred, described tilt of the surface and the angle between the vertical end face of the impeller is 25 ° ~ 45 °.
As optimization, by said of Qian rectifier and the Hou rectifier Zhijian formed of cavity body near Qian rectifier of location at has Regulation Board, and by said of Regulation Board Shang has regulation block, by said of Qian rectifier of within wall has for card collection regulation block of card mouth, by said of Regulation Board of top through cut surface are Hexagon of connection head and for calibration of Regulation valve phase connection. In this way, can be easily calibrated by adjusting the plate, easy to regulate.

Source: http://asmeter.com/

Jan 27 2015

Two-way horizontal Woltman type water meter levels of structures, as well as bi-directional screw-type water meters with which advantages?

Two-way horizontal Woltman type water meter, which includes case, wing wheel module, rectifiers, cumulative count of gear mechanism, which is characterized by: Cumulative count organizations connected in a planetary gear differential gear train–ratchet pawl, and administered by two separate counters for measuring water flow in both directions. Advantages: accurate measurement of the two-way flow of water in the pipeline, suitable for large and medium cities water supply water pipe NET system; because it consists of a simple gear train to achieve bi-directional measurement, than the existing bi-directional meter cost is greatly reduced.

Horizontal Woltman type water meter belongs to the field of fluid measurement instrument technology. Its mainly cover plate mounted on top of the case, lower part of the casing is equipped with counting bodies, counting bodies equipped with a drive mechanism, wing wheel mounted on one side of the center hole of the rectifier, wing at the other end of the wheel axle shaft mounted drive mechanism outside of the Center. Drive mechanism of shell with worm and worm gear and Center, respectively, fitted with a magnet on the worm and gear.

This practical new structure compact, and reasonable; due to used has overall type vacuum sealed of magnetic drive institutions, so can makes wing round and drive institutions Zhijian no directly of mechanical drive, can reduced has wing round turned of mill wipe resistance, improve meter of performance; can makes drive institutions long-term keep stable of work; can effective to prevent flow in the of impurities winding in worm, and worm Shang and produced meter of fault; and can effective to prevent mutations of flow impact worm, and worm and produced meter of fault.

source:http://www.asmeter.com/

Dec 01 2014

The structure and working principle of the meter

Rotor type water meter is a speed type water meter, water meter varieties in the world is the most used.

Turbine Woltman Type Water Meter

In the national standard, the definition of velocity meter for “installed in the closed pipe, consisting of a power element, a water meter and flow speed by directly makes its obtain movement”. When the water flow through the meter, driving the impeller (rotor or spiral wing) rotation, and flow rate and impeller flow speed is proportional to, because the section area of nozzle flow driving impeller for constant speed and flow is also proportional to the impeller. Through the linkage components on the impeller shaft is connected with a counting mechanism, make the counting mechanism (cumulative impeller rotor or spiral wing) rpm, so write down through the meter of water.

Rotor multi beam type water meter is composed of a case, Turbine Woltman Type Water Meter, table glass, sealing washers, a measuring mechanism, a counting mechanism and strainer etc.

Rotor type water meter gear box at the bottom of the general had about three of the fixed rib, its main function is to, when the water meter in the large flow operation, on the impeller rotation damping effect, to improve the water meter in the performance curve of large flow area. Because when very small flow through the meter, the flow rate is very low, the minimum kinetic energy flow, not enough to overcome the inertia of the impeller, impeller without rotation. The question slightly increase velocity, impeller is rotating, but cannot accurately measure the range of flow meter, so the minimum flow following a slow phenomenon. Then gradually increase velocity, water meter to the fast development trend, if there is no gear box on the bar to damping, this trend will continue until around 10% ~ 15% after partial fast (compared with rib damping), the performance curve will tend to smooth.

In recent years, the Woltman Type Bulk Cold(Hot) Water Meter  improved significantly, but part of the pipeline is also the existence of rust, flax, iron and sand and other impurities, these impurities with the flow meter inlet end to. In order to prevent impurities from entering the meter movement, causing water fault, so on the water inlet end are provided with filtering net. Is a bowl shaped strainer used, set outside in the impeller box, this structure the dirt holding capacity is bigger, and even blocked a part of mesh after measurement capability also less affected; the other is a barrel shaped filtering net is arranged on the water meter shell, water inlet side, effect than the bowl shaped strainer differential.

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