RU1830456C - Floating flow rate meter - Google Patents

Abstract

Usage: when determining the flow of fluid to the consumer. SUMMARY OF THE INVENTION: Hinges connected to a positional loading device are placed in a hollow float. The float is mounted on a saddle with side slots communicating the body cavity with a pressure channel and a drain channel with a valve. The output of the float position sensor is connected to a counter and an input. 1 s.p. f-ly, 3 ill.

Description

The invention relates to measuring technique and can be used to determine the flow rate of a liquid in a mass way, in particular to determine the flow rate of pumps.

The purpose of the invention. is to increase the reliability of flowmeters.

In FIG. 1 is a diagram of a liquid float meter with a float in an unloaded state; Fig. 2 shows a float in a single load condition; Fig. 3 shows a float in a state of loading with two weights.

The liquid flow meter (see FIG. 1) consists of a tank 1, a float 2 placed in it, mounted with three guide rods 3 in the guide sleeves 4, two of which are fixed in the bracket 5, and one in the siege 6, Moreover, all the rods are located on different axes, not coinciding with each other. The cover 7 of the float 2 is connected to the bracket 5 by means of a tension spring 8. A flag 9 of the position sensor 10 is installed on the cover 8. The channel 1 is connected to the pressure channel 12 and the drain channel 13. At the free end of the channel 13, a valve 14 is connected to an actuator 15.

Inside the float along its axis through the hole 16 (figure 2) in the bracket 5 and the hole 17 (figure 2) in the cover 7 passes a thread 18 with low elasticity, for example, a multi-strand polyamide, on which the webs 19 and 20 are fixed. 19, centering, for example conical, surfaces 21 (FIG. 1) and 22 (FIG. 2) are made, one of which (19) centers the hinge 20 relative to the axis of the float 2 when it is lowered onto the centering surface 23 (FIG. 1) of the float 2, and the other 22 (see FIG. 2) serves as a centering surface for the hitch 20. On the hitch 20 (see FIG. 2), the centering surface s 24 and 25, one of which (24) centers the sample of 20, and the other (25) may be a centering surface for fixing on the thread 18 of the additional sample. The thread 16 passes through the block 26 and is fixed in the positional loading device 27.

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CA

g sl ck

The control unit 28 is electrically connected to the actuator 15, the positional load device 27, the pulse counter 29, the position sensor 10, which in turn is connected to the pulse counter 29.

Float flow meter fluid works as follows.

When liquid enters the flowmeter with the valve 14 open, free flow of liquid from the drain channel 13 occurs. The liquid level in the vessel 1, according to the law of communicating vessels, is on line AA, called the zero level, due to insufficient lifting force acting on the float 2 from the liquid side located in the container, it rests on the seat 6. The linkages 19 and 20 are in a raised state. The thread 18 and its portion 30 are elongated by the gravity of the linkages 19 and 20. The spring 8, if a tensile spring is used, is stretched, and if a compression spring is used, it is compressed by gravity (weight) by Cavity 2.

By the signal Measurement from the control unit 28, the actuator 15 closes the valve 14. The filling of the tank 1 begins. When the liquid level in the tank 1, which corresponds to line BB, is reached, the force Fa acting from the liquid side to the float 2 becomes equal to the weight P of the float 2 minus the force RPR spring 8

Fa P - F

-GR

(1)

the elastic forces of the applied filament are negligibly small. After loading the float 2, the gravity acting on the liquid from the side of the loaded float 2 exceeds the buoyant force acting on the liquid side, and the float 2 guided by the rods 3 relative to the sleeve 4 sits on the seat 6. The accumulation of pulses in the pulse counter 29 continues. Upon reaching the liquid level corresponding to line B-B, the force Fa1 acting on the liquid side of the loaded float 2 becomes equal to the weight of the float 2 and the weight of the hinge 19

minus the force Fnp of the spring 8.

Fa1 P + GPN1 9 - F

etc,

(2)

where TC1 is the mass of the sample 19;

g is the acceleration of gravity.

The float begins to float. Flag 9 crosses the response zone of the sensor 10 in the same position at which the sensor-10 occurred when lifting

float 2 no load. The sensor 10 provides a signal to the pulse counter 29 to the control unit 28. The accumulation of pulses ceases. The control unit 28 provides a signal to the positional load device 27 and to the actuator 14. The linkages 1.9 and 20 are raised to their original position. Valve 15 opens. Liquid through channels 11 and 13 is drained from tank 1 to level AA.

The difference in forces at the time of float float 2 with and without load will be equal to

Float 2 begins to rise. In this case, the flag 9 crosses the response zone of the position sensor 10. The sensor 10 provides a signal to the pulse counter 29, for example, a time counter or a cycle counter. Pulse counting begins. The sensor 10 also provides a signal to the control unit 28, which in turn provides a signal to the positional load device 27. Depending on the command from the control unit 28, the positional load device 27 moves the thread 18 to a certain position and loads the float 2 with one, two or by another number of ya weights, depending on the command given and the number of 18 attachments fixed to the thread. When loading the float with one hitch

19 the link 20 continues to pull the thread 18, and the portion of the thread 30 between the links 19 and

20 is curved (see FIG. 2). In this case, the effect of elastic forces on the float 2 from the side of the section of thread 30 does not take place, because

Fa1 - Fa P + GPN1-9 - Fnp (P - Fnp) (3)

or, denoting Fai - Fa AFi, we have AFi (4)

Fa is the force of the liquid acting on the float in the volume of the submerged part of the float along line BB without load

Fa Vn p.g,

(5)

where Vn is the volume of the submerged part of the float without load;

p is the specific gravity of the liquid

.

Vn Sn h. (6)

where Sn is the cross-sectional area of the float;

h is the immersion depth of the float corresponding to the liquid level on lines B-6,

or Fa Sn - h- / 9-g;

(7)

F3i is the force of the liquid acting on the float in the volume of the immersed part of the float with a loaded hinge 19:

Fa1 Vn1- / 9 g,

(8)

where Vni is the volume of the loaded part of the float along the line BB with a loaded hitch 19

or

Vni Sn- hi (9)

Fa Sn hi- / o.g. (10) Substituting (7) and (10) in (4), we obtain

Sn hi- / 9.g - Srrh- / 9.g tnd (11)

or Sn- / o (hi - h) mHi (12)

or Sn - Ahi / 9 tH1,. (13) where Дгп hi - h.

During the measurement period between levels BB and BB, the mass of liquid tJ1 was filled into the tank

tzh1 Muts-r,

(14)

where / f is the volume of liquid poured between levels BB and BB, Al - Sn Ahr;

SK is the area of the annular surface of the liquid between the outer surface of the float 2 and the inner surface of the tank 1.

Expressions Already through SK and DP, we obtain

Zk Dp- / tZh1

(fifteen)

We divide expression (13) by (15) and after the transformations we obtain

GPzh1 GPts1

Sn

(sixteen)

From the expression (16) it follows that the weight of the suspended fluid gpG1 during the period of change during loading of the float with one portion is equal to the product of the weight of the portion of tH1 by the ratio of the area of the annular surface between the outer surface of the float 2 and the inner surface of the tank 1 to the cross-sectional area of the float 2 .

In order to calculate the flow rate of the test object, for example, the pump supply, it is necessary to attribute the measured tl1 mass to the time accumulated in the pulse counter 29 or the number of cycles.

In the case of measuring the flow rate when the float is loaded with two weights, the control unit gives a command to load the float with two weights. The rest of the work of the flowmeter is similar to its work when measuring the flow rate of one sample.

After the float 2 first floats up, the linkage 19 (see FIG. 3) is lowered by the command from the control unit 28 onto the centering surface 23 of the float 2, and the linkage 20, with its centering surface 24, sits on the centering surface 22 of the linkage 19. The portion of thread 30 between the linkages 19 and 20 bends and thread 18 between block 26 and link 20 sags. After the second float emerges, when the liquid is filled up to the level ГГ Г of the control unit 28, it gives a command to raise the hinges 1-9 and 20 to the initial position, and the valve 14 opens. The mass of liquid measured by the flow meter of two linkages, by analogy with formula (16), will be

.

with

GPzh2 (tn1 + GL „2) - on

(17)

For the sockets mounted on the threads 30, the measured mass of liquid will be:

35

GPGP (GPN1 + GPN2 + ... + GPNP) (18)

Op

The feed of the test pump for suspension is calculated as the ratio of the measured mass to the accumulated time or accumulated cycles.

40 The use of a flowmeter will simplify its design, expand the measuring range, and also reduce the dimensions of the tank.

45

Formulas of the invention

Claims (2)

1. A liquid float flow meter containing a pressure channel branched into a drain channel with a valve, an actuator and a control unit and into a tank cavity, inside of which a hollow float is mounted on the rails, equipped with load hinges connected with a loading device connected to the block a non-contact float position sensor and a pulse counter, characterized in that, in order to increase the reliability of operation, the load hinges are installed inside the hollow the float on the segments of the thread sequentially and with a gap between each other, the bottom float is mounted on the inserted seat, the guides are made in the form of parallel rods, the pressure channel being in communication with the reservoir cavity through its bottom and the slots in the saddle, the output of the position sensor is connected to the pulse counter and control unit input, and hinges, .t / & f the melt and saddle are provided with centering elements, wherein the loading device is positional with the number of working positions equal to the number of load linkages. 2. A flowmeter pop. 1, characterized in that the float is connected to the reservoir by an elastic element that compensates for the weight of the float, and made in the form of compression and tension springs. // fie. 2 sixteen fi & z