RU2597029C2 - Hot water meter - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: invention is intended for use in devices for measuring flow rate of hot water. Hot water meter comprises a thermomagnetic screen secured on a sealed non-magnetic partition between the driving and the driven magnetic half-couplings.

EFFECT: technical result is dependence of rotation of the driven magnetic half-coupling from temperature of water passing through the counter.

4 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 calculating the flow of cold and hot water such as VSKM, STVH, STVU DG, STVG, VMG and many others. Any water meter consists of a housing in which a counting mechanism with a driven magnetic coupling is installed, separated by a sealed non-magnetic partition from the impeller or turbine with a leading magnetic coupling. The principle of operation is based on the fact that water rotates the blades of the impeller (turbine) located in it at a speed proportional to the flow rate. The rotation is consistent with the rotation of the leading magnetic coupling half, which synchronously transmits the rotation through a sealed non-magnetic partition to the driven magnetic coupling half mounted in the counting mechanism. The counting mechanism provides the translation of the number of revolutions in the measured leaking volume. Counters of hot water of this type do not make it possible to distinguish which part of the water passed through them according to the hot standard and which is cold.

The objective of the present invention is to ensure that the rotation of the driven coupling half depends on the temperature of the water passing through the meter.

The problem is solved by the fact that in the hot water meter containing the leading and driven magnetic coupling halves separated by a sealed non-magnetic partition, a thermomagnetic screen is fixed on the sealed non-magnetic partition between the master and driven magnetic coupling halves, as well as the fact that the thermomagnetic screen is mounted on a sealed non-magnetic partition from the leading magnetic coupling half and is made of a multilayer thermomagnetic material in the form of a washer.

Thermomagnetic materials are materials with a strong dependence of the saturation of the magnetization on temperature in a given magnetic field. This property manifests itself near the Curie point, where the thermal motion of the particles of matter disorientes their magnetic moments. Thermomagnetic materials are usually divided into two groups: thermomagnetic alloys and multilayer thermomagnetic materials. Thermomagnetic alloys include Ni-Fe-Cr alloys (compensators), Ni-Cu (calmalloys), and Ni-Fe alloys (thermalloys). The advantages of compensators include the reversibility of their properties in the temperature range of ± 70 ° C, good reproducibility of characteristics, simple mechanical processing. Multilayer thermomagnetic materials have several advantages compared with thermomagnetic alloys: the ability to calculate magnetic properties and a variety of characteristics, achieving saturation in weak fields, a weak dependence of saturation on the field (see Physical Encyclopedic Dictionary. - M .: Soviet Encyclopedia. Editor-in-Chief A.M. . Prokhorov. 1983).

The drawing schematically depicts the proposed hot water meter (on the example of a wing meter) with the details necessary and sufficient to understand the essence of the invention.

The counter contains an impeller 1 with a leading magnetic coupling 2, separated from the driven magnetic coupling 3 by a sealed non-magnetic partition 4. On a sealed non-magnetic partition 4 from the side of the driving magnetic coupling 2, a thermomagnetic screen 5 is made of a multilayer thermomagnetic material in the form of a washer.

The operation of the device is as follows. Under conditions when water (shown by arrows) with a low temperature (for example, 30 ° C) passes through the meter body, the thermomagnetic screen 5 closes the magnetic field lines of the leading magnetic coupling 2 and the driven magnetic coupling 3 completely to itself, thereby screening these coupling halves apart from each other. For this reason, despite the fact that the impeller 1 rotates the leading magnetic coupling 2 under the pressure of the water meter passing through the meter body, the driven magnetic coupling 3 does not rotate and the counting mechanism (not shown) does not calculate the water flow rate. When the temperature of the water passing through the meter body rises, the magnetic resistance of the thermomagnetic screen 5 increases and its shielding property decreases. As the temperature of the water rises and then the coupling of the coupling halves 2-3 to each other increases through their magnetic fields passing through the material of the thermomagnetic screen, and the driven coupling half 3 begins to rotate. Moreover, the higher the water temperature, the higher the magnetic coupling between the leading and driven half-couplings, the closer the rotation speed of the driven magnetic half-coupling 3 is closer to the rotation speed of the leading magnetic half-coupling 2. When the water temperature reaches a design maximum, for example 50 ° C, of a thermomagnetic screen 2 having negative coefficient of magnetic permeability, the magnetic resistance increases so that the maximum magnetic adhesion of the coupling halves 2 and 3 to each other occurs and their rotation speed is synchronized. When the water temperature decreases, the thermomagnetic screen 5 cools, its magnetic resistance decreases and, therefore, its shielding properties are restored, the magnetic coupling between the coupling halves 2-3 decreases, the rotation speed of the driven coupling half 3 due to friction of the details of the counting mechanism begins to lag behind the rotation speed of the magnetic coupling 2. When the calculated minimum water temperature is reached, for example 30 ° C, the thermomagnetic screen 2 again completely closes the magnetic fields of the leading and driven half-couplings, as a result of which olumuft 3 stops its rotation.

Depending on the calculation of the characteristics of the thermomagnetic screen, you can set a very wide temperature range for the counter, the properties of thermomagnetic materials allow this.

The use of the proposed device will avoid disputes with management companies related to the 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 (4)

1. A hot water meter comprising a leading and driven magnetic coupling halves separated by a sealed non-magnetic partition, characterized in that a thermomagnetic screen is fixed to the sealed non-magnetic partition between the master and the driven magnetic coupling halves. 2. The hot water meter according to claim 1, characterized in that the thermomagnetic screen is mounted on a sealed non-magnetic partition from the side of the leading magnetic coupling. 3. The hot water meter according to claim 1, characterized in that the thermomagnetic screen is made of a multilayer thermomagnetic material. 4. The hot water counter according to claim 2, characterized in that the thermomagnetic screen is made in the form of a washer.

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