SU1636687A1 - Flow meter - Google Patents

Description

one

(21) 4435383/10

(22) 03.06. 88

(46) 03/23/91. Bnsh. № 11

(72) V.V. Moskalev, N.V. Fedorets,

A.V. Derevenchenko and V.P. Borigenko

(53) 681.12 (088.8)

(56) USSR author's certificate No. 892215, kp. G 01 F 1/10, 1981.

(54) FLOW METER

(57) The invention allows to expand the range of measurable expenses. The liquid comes from the larger

the impeller 3 and rotates it with a frequency proportional to the fluid flow. The signal is removed using a tachometer 5. To change the mode of operation of the flow meter, a corresponding command is sent to the hub movement mechanism. Moving, k the hub provides the optimum operating mode of the required turbine and connects the corresponding winding of the tachometer. The flow meter can be used to measure the fluid flow of various hydraulic devices, 3 sludge.

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FIG. one

This invention relates to a technique for measuring fluid flow.

The purpose of the invention is to expand the range of flow measurement.

Fig, shows the flow meter, the position at maximum flow; in fig. 2 - the same, intermediate position; in fig. 3 - the same position with a minimum flow. J

The flow meter consists of a housing 1, in which streamers 2 to the impeller 3 of different diameters are placed, placed on a fixed shaft 4, on the case 1 tachometers 5, 1 are mounted opposite to the corresponding turbines 3, in case 1 mounted on the thread of the step sleeve 6, equipped with magnetic the ring 7 and the rotor 8, which are permanently mounted around the circumference of the permanent magnets associated with the control winding 9, are also located on the housing magnetic contacts (reed switches) 10.2

The device works as follows.

The liquid enters from the side of the larger impeller 3 and causes it to rotate, the rotational frequency of the turbine, proportional to the flow rate, of the liquid, is removed using an appropriate tachometer 5 connected through a reed switch 10, closed by a magnetic field of the magnetic ring 7. If necessary, change - the flow measurement apase is applied to the winding 9 and the rotating field of the latter interacts with the rotor 8, causing the sleeve 6 to be screwed into the housing before the rep-10 actuates, and the winding of the second tachometer 5 is connected, and Once in the flow, the impeller takes place in the corresponding channel of the stepped hub 6 and the flow measurement is carried out by the second impeller (Fig. 2). In the future, for example, with a decrease in consumption, you can switch to measurement by the third impeller, etc. To ensure turbine switching, the length of the sleeve steps should be chosen according to the following relationship:

 -Ar + (p-1) b,

where at is the width of the turbines;

b is the distance between the turbines;

P - the number of impellers. The supply of control voltage can be carried out either manually, thereby expanding the functionality of the flow meter, or automatically, while expanding the flow measurement range.

Claims (1)

Invention Formula A flow meter comprising a housing, a turret located in a stepped channel, a tachometer and a pulverizer, characterized in that, in order to expand the range of measurable flow rates, there are several impellers of different diameters equipped with tachometers in the stepped channel, and the stepped channel is designed as sleeve, located inside the housing of the flow meter with the possibility of axial movement, and the length) of steps is determined from the ratio 1CT p-at + (p-1) b, where Fri is the number of impellers; at - width of impellers; b is the distance between the turbines. 2 Fi.Z