RU2585306C1 - Impeller of hot water meter - Google Patents

Abstract

FIELD: test and measurement equipment.

SUBSTANCE: invention is intended for use in devices for measuring flow rate of hot water. Hot water counter impeller comprises drive magnetic coupling, which is placed in sealed container made of nonmagnetic material, filled with magnetic fluid.

EFFECT: technical result is directly proportional dependence of rotation speed of driven half-coupling from temperature of water passing through counter.

1 cl, 1 dwg

Description

The invention relates to measuring equipment and can be used in devices for measuring the flow of hot water both for industrial enterprises, where there is a need for accurate accounting of the flow of hot water to the consumer, and for individual consumers, for example apartment buildings.

Currently, there are certified meters for the calculation of cold and hot water consumption such as VSKM, STVU GD, STVG, VMG and others. Any water meter consists mainly of a housing, an impeller having a hub with blades and a leading magnetic coupling half mounted in the hub, as well as a counting mechanism. The principle of operation is based on the fact that water passing through the housing rotates the blades of the impeller located in it with a speed proportional to the flow rate. The rotation of the impeller is consistent with the rotation of the leading magnetic coupling half, which synchronously transmits the rotation through the sealed non-magnetic wall of the housing to the driven coupling half mounted in the counting mechanism. The counting mechanism, having a scaling mechanical gearbox, provides the conversion of the number of revolutions of the impeller into the measured leaking volume. Counters of hot water of this type do not allow to distinguish which part of the water passed through them according to the standard of hot and which is cold.

The objective of the present invention is to provide a directly proportional dependence of the rotation speed of the driven coupling half on the temperature of the water passing through the meter.

The problem is solved in that in the impeller of a hot water meter containing a hub with blades and a leading magnetic coupling half mounted in the hub, the leading magnetic coupling coupling is placed in a sealed container of non-magnetic material filled with magnetic fluid.

Magnetic liquid is a suspension of finely divided particles of a solid ferromagnetic body in a liquid "carrier" extremely sensitive to the magnetic field. The magnetization of the magnetic fluid decreases with increasing temperature, and is restored with decreasing temperature. (See, Uspekhi Fizicheskikh Nauk journal. 1967 Volume 92, issue 2)

The drawing schematically shows the proposed impeller of a hot water meter. The impeller contains a hub 1 with blades 2. A leading magnetic coupling half 3 is installed in the hub 1 and placed in an airtight container 4 filled with magnetic fluid 5. The container 4 is made of non-magnetic material.

The work of the proposed impeller is quite simple. In conditions when water with a low (for example, room) temperature passes through the meter body having a driven half-coupling (not shown), the magnetic fluid 5, located in an airtight container 4, enveloping the leading magnetic half-coupling 3, closes the magnetic field lines, created by the coupling half 3 to itself, thereby shielding the driven coupling half from the magnetic field of the leading coupling half 3. Moreover, despite the fact that the impeller rotates under the pressure of the water passing through the meter body, the driven coupling does not rotate and mechanism of flow produces count. When the temperature of the water passing through the meter body rises, the magnetization of the magnetic fluid 5 decreases and its shielding property decreases. In this case, the magnetic field created by the leading magnetic coupling half 3, outside the magnetic fluid 5, increases and the magnetic coupling between the master and driven half coupling also increases - the driven coupling half begins to rotate. Moreover, the higher the water temperature, the higher the magnetic coupling between the leading and driven half-couplings - the rotation speed of the driven magnetic half-coupling increases. When the water temperature reaches the design maximum, for example 60-75 ° C, the coupling halves rotate synchronously. When the temperature of the water decreases, the magnetic fluid 5 cools, the magnetization increases - its shielding properties are restored, the magnetic coupling between the coupling halves decreases, and the rotation speed of the driven coupling half also decreases. The dependence of the rotation speed of the driven coupling half on the magnitude of its magnetic coupling with the leading magnetic coupling exists due to the fact that the friction force of the parts of the counting mechanism of the water meter, subject to the rules of its operation according to the technical conditions, is unchanged.

The experiments to determine the dependence of the rotation speed of the driven magnetic coupling half on the strength of its magnetic interaction with the leading magnetic coupling in the water meter (WFK2-ITELMA), conducted by the author of the invention in private, confirmed the idea embodied in the invention.

The use of the proposed impeller in hot water meters will allow avoiding disputes with management companies related to payment of services for the supply of hot water. Since the water passing through the hot water pipes does not always have the required temperature, as a result of accurate, and therefore fair accounting of its temperature, significant consumer savings can be achieved.

Claims (1)

A hot water meter impeller comprising a hub with blades and a leading magnetic coupling half mounted in the hub, characterized in that the leading magnetic coupling coupling is placed in a sealed container of non-magnetic material filled with magnetic fluid.

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