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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Aug 21 2014

Error of Turbine Woltman Type Water Meter adjusting device, a counting mechanism, a rectifier and history

Turbine meter, refers to the helix axis and the axis of the tap water pipeline for water meter into parallel (or overlapping), the impeller adopts spiral wing shape. This is not to say that the level of the water meter can be installed. Of course, such as the water meter to vertical installation, should the water jewel plain end bearing selection inlet side spiral shaft bearing hole, in order to reduce friction, prolong the service life of the water meter. Imports of some types of spiral wing type water meter adopts dynamic balance technology, can work in horizontal, inclined and vertical state, but the class of measurement work in non horizontal state when the water to reduce the level of.

http://www.asmeter.com/datacache/pic/280_257_0bca250cacd15dbfd1c79b9bbe2da5ca.jpg

Nominal diameter 80 ~ structure level of Woltman water meter of 200mm indicated in Figure 2-12, in fact, object diagram see Annex C figure C.7. Turbine Woltman Type Water Meter is mainly composed of a watchcase, rectifier, error adjusting device, spiral wing, bracket, worm gear, a counting mechanism, sheet glass, sealing gasket and cover parts.

Common error adjusting device two.

(1) Combination Cold Water Meter

In part this adjustment device is a piece of flat and symmetrical paddle shaped adjusting plate, rectifying plate is positioned in the rectifier part. When the rotating paddle shaped adjusting plate, it can increase or decrease this part of water flow to the spiral rotation impact, thus plays the role of error. Paddle shaped error adjusting device has the advantages of simple structure, less components and easy processing and convenient assembly and disassembly, so widely used.

(2) the rudder type error adjusting device

The regulating device role is part of a flat plate, plate is provided with a shaft hole, the adjusting plate is arranged on the rectifying plate rectifier for shaft parts. The regulation error, a shaft on the other side the rudder shape adjustment plate, so that the adjusting plate around the axis of rotation, to increase or decrease the water flow to the spiral rotation impact, thus plays the role of error. The adjusting device is complex.

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Jul 04 2014

Characteristics of the solution, the Turbine Woltman Type Water Meter performance parameters, common problems and development

Level Woltman water meter, also called vortex type water meter, water meter refers to the helix axis and the water pipe Zhou Xiancheng parallel (or overlap), the impeller adopts spiral wing shape. This is not to say that the level of the water meter can be installed. Of course, such as the water meter to vertical installation, should the water jewel plain end bearing selection inlet side spiral shaft bearing hole, in order to reduce friction, prolong the service life of the water meter. Imports of some types of spiral wing type water meter adopts dynamic balance technology, can work in horizontal, inclined and vertical state, but the class of measurement work in non horizontal state when the water to reduce the level of.

Turbine Woltman Type Water Meter

In the case, cover, table glass and a sealing washer together to form a sealed body, make the case within the tested water without leakage to the outside. According to the standard requirements, the Turbine Woltman Type Water Meter should be able to withstand the pressure of 1.6MPa, sustained pressure test pressure of 2.OMPa, 15min and 1min continued. Therefore, in the case, cover and table glass shall meet the requirements. The watchcase hole shall be lined with resistant liner rot material made of or coated with antirust coating with good.

Rectifier functions: one is to come from water upstream in turbulent flow in the rectifier through the grid, as far as possible the “out” into the state of laminar flow; two is provided with a shaft hole in the center rectifiers, to support the spiral shaft, axle hole and the shaft hole on the bracket should be coaxial, in order to ensure the spiral wing flexible rotation.

The role of stents: on the one hand supporting the helix axis, so that the spiral wing can rotate flexibly under flow action; on the other hand through a worm and worm wheel bracket and screw wing shaft is engaged, the spiral wing speed to the upper part of the bracket is connected with a counting mechanism.

Water meter Woltman water meter using spiral plate shaped impeller, also called spiral wing or wing wheel, enough mechanical strength engineering plastic generally use (such as ABS) injection molding. Spiral tube body is a hollow, to reduce weight and increase buoyancy. Spiral wing end is provided with a cover adhesive binder and, in case the measured water immersion after the increase of weight. Spiral wing has better dynamic balance performance, or when the high-speed operation, easy to make the spiral shaft and sleeve wear.

Common error adjusting device two.

(1) paddle error adjusting device

In part this adjustment device is a piece of flat and symmetrical paddle shaped adjusting plate, rectifying plate is positioned in the rectifier part. When the rotating paddle shaped adjusting plate, it can increase or decrease this part of water flow to the spiral rotation impact, thus plays the role of error. Paddle shaped error adjusting device has the advantages of Woltman Type Bulk Cold(Hot) Water Meter, less components and easy processing and convenient assembly and disassembly, so widely used.

(2) the rudder type error adjusting device

The regulating device role is part of a flat plate, plate is provided with a shaft hole, the adjusting plate is arranged on the rectifying plate rectifier for shaft parts. The regulation error, a shaft on the other side the rudder shape adjustment plate, so that the adjusting plate around the axis of rotation, to increase or decrease the water flow to the spiral rotation impact, thus plays the role of error. The adjusting device is complex.

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