SU847041A1 - Flow meter valve - Google Patents

Description

one

This invention relates to measurement M and can be used in liquid flow meters with different densities.

Known flow meters in which a spring-loaded valve stem. Performed in the form of a truncated cone 1.

The disadvantage of such a shutter is that the truncated cone shutter has a small working distance, which reduces the measurement range.

The closest technical solution to the invention is a flow meter valve containing a saddle spring-loaded gate in the form of two conical surfaces with different angles of taper 2.

However when moving the shutter. changes in the hydrodynamic characteristics of the valve, which significantly affects the parameters of the controlled

environment.

The purpose of the invention is to reduce the effect on the parameters

environment.

The goal is achieved by the fact that the shutter is made in the form of a cone with a vertex angle of 110-130.

in fig. 1 shows the diagram of the valve; in fig. 2 shows the dependence of the flow coefficient) on the Reynolds number (Re) in FIG. 3 shows the construction of a flow meter operating with a valve (FIG. 1).

the valve contains (Fig. 1) a saddle 1, a cone-shaped shutter 2, a spring 3. The angle ci at the apex of the cone is 110 ° -130 °.

The device works as follows.

When the flow rate is applied, the shutter rises, compressing the spring, the a-value of the shutter code h will be proportional to the product of the fluid density and the square of the flow rate, i.e. p-q.

t5

This is achieved by the fact that when choosing the correct taper angle of the gate, the hydrodynamic forces acting on the gate become more stable and the flow direction in the saddle zone does not depend on the magnitude of

J

The magnitude of the complex p Q is determined by the equation

25

2n oil - to be.

2 51 D 2S

- fluid density

where p

Claims (2)

-. volume flow rate; 30Q N is the force of preliminary tightening of the spring and axial component of the weight of the cone; C - spring stiffness; D Z - the difference between the levels of fluid in the output branch; - the specific gravity of the fluid; - consumption coefficient; 2 - the sum of coefficients of local resistances of the branch; S is the cross-sectional area of the outlet branch pipe; , D - respectively, the length and diameter of the pipeline output branch; - friction resistance coefficient. In the absence of an output branch, i.e., when the ram is installed; Equation (1) is simplified. Equation (2) is confirmed by numerous numerical tests, which plotted the graph of the dependence of the flow coefficient on Re and the angle d at the apex of the cone (see Fig. 2). At 00120 ° for Re-7600, the discharge coefficient can be assumed to be constant and equal to | U 0.85, and the dependence of the complex pQ will be unambiguous on the height h of the cone rise. The flow meter (see Fig. 3) consists of a housing with inlets 4 and outlet 5 / in which a cone-shaped different shutter 2 is installed along the axis of the fluid inlet, which is clamped to the saddle by a spring 3. core 7 of the inductive sensor core 7 is connected to the stem of the thief with the help of clutch 8; it is made of thermal insulation material, i.e. material with a low coefficient. heat conduction volume. On the lid b there is a casing 9 of the inductive sensor with vent holes on the side surface. The sensor coil 10 is screwed into the casing, which, after height adjustment, is locked with a strip .11. The signal from the inductive sensor coil is fed through the amplifier 12 to the secondary device 13 (milliammeter or volmeter), the scale of which is calibrated in units of flow. The device works as follows. The measured fluid through the fitting 4 (see FIG. 3) enters the flow meter and depresses the shutter 2, overcoming the spring force 3. The movement of the core 7 in the coil 10 of the induction sensor is fixed through the amplifier 12 by the secondary device 13, the scale of which is calibrated in units of flow. This allows the use of a tachometer to measure the flow rates of liquids with different densities without calibration. The invention of the flow meter valve containing a saddle and a spring-loaded gate, is characterized by the fact that, in order to reduce the effect of the valve on the parameters of the controlled medium, the valve is made in the form of a cone with an apex angle of 110-130 °. Sources of information taken into account in the examination 1.Patent of Switzerland 524135, cl. G 01 F 1/00, published .. 1972. 2.-Patent of Germany No. 2043252, cl. 42E 23/01, publ. 1972 (prototype). eleven -.