SU847295A1 - Liquid viscosity regulator - Google Patents

Description

The invention relates to an automatic machine, in particular to devices for regulating the viscosity of a liquid.

A device for regulating the viscosity of a liquid containing a viscometer and a temperature regulator p] is known. *

The closest in technical essence to the proposed one is a device for regulating the viscosity of a liquid containing pressure output pipelines connected to two parallel pipes located between them, the first of which has a laminar choke, and the second has a £ 2 heater. _{| S} A disadvantage of the known device is that it does not provide smooth regulation of viscosity, within a wide range of regulation.

The purpose of the invention is the expansion of the bottom _{χ of the} regulation range and increasing the accuracy of the regulator.

This goal is achieved by the fact that the fluid viscosity regulator2 contains a turbulent throttle installed in the second nozzle in series with the heater.

In addition, the controller contains a cooler installed in the first pipe in series with the laminar -. throttle.

The drawing shows the proposed fluid viscosity regulator.

The regulator contains pressure head 1 and output 2 pipelines, between which the first 3 and WTO are located in parallel. a swarm of 4 nozzles, and in the first nozzle .3 a laminar throttle 5 and a cooler 6 are installed, and in the second nozzle 4 a turbulent throttle 7 and a heater 8. are installed. The pressure in the pressure pipe 1 is created by: pump 9.

The regulator operates as follows.

³ 847295

A fluid with a certain viscosity flows from pump 9 through a pressure pipe 1 to two parallel pipes 3 and 4, in which laminar and turbulent chokes are installed, respectively | cooler and heater. After the passage of the nozzles, the flows are combined in the outlet Pipeline 2.

The throttle with a laminar flow is made of at least one cylindrical channel, the parameters of which are determined by the ratio:

dVo y- <0.794105 where d is the diameter of the channel,

C is the length of the channel

P is the density of the fuel,

ΔΡ ~ pressure drop across the dross' le.

Turbulent Flow Choke is in the form of a flat diagram.

When the regulator is used, _{o is} used, the principle of the dependence of the fluid flow ²⁵ on the viscosity through the throttle with laminar flow and the independence of the flow on viscosity through the throttle with turbulent flow.

With increasing viscosity of the input stream, the amount of liquid passing through the turbulent throttle and heater 8, in which the liquid is heated to a certain temperature and its viscosity decreases, increases. At the outlet, the fluid flows are combined into a single stream with a higher temperature and lower viscous flow than at the inlet.

The ratio of the flow cross-sections of the Dros-i ⁴⁰ mudflows 5 and 7 is chosen in such a way that the heating of the flow going through the throttle 7 ensures the required fluid viscosity at the outlet. ₄₅

Analytical _; studies have obtained the following flow ratios in throttles

where - the amount of fluid passing through the heater ₅₅ in units of time tsu;

Q _H is the total fluid flow through both chokes per unit time;

Kj - / f _g ~ the ratio of the geometric passage sections of the chokes;

/ 4 ~ coefficient of expiration of a turbulent throttle;

3) _a is the kinematic viscosity of the liquid at the inlet to the regulator;

B - the length of the laminar throttle; η is the number of channels of the laminar throttle.

The viscosity at the 'output of the regulator depends on the fraction of fluid passing through the heater, and this dependence is determined by the following semi-empirical expression

1). x3). 4 ₀ - ^ ^k and (^ _u -1 _a )

B a>

where 3L · “viscosity of the fluid at the inlet h o in the regulator;

tg is the inlet fluid temperature;

- fluid temperature at the outlet of the heater;

m is an empirical coefficient.

Thus, for each initial viscosity. there is a certain value of K _p , i.e. a certain proportion of fluid passing through the heater. In turn, for each K _n there is one definite value of the output viscosity The ratio between 3) 3 and 1) · ^, ceteris paribus, is established by the value, iT.e. the ratio of the geometrical passage sections of the chokes 5 and 7.

An analysis of the above equations shows that when the input signal of the regulator is mismatched, it is expressed by the deviation of the viscosity at the input to the regulator by the value Δ'ίφ>. the mismatch value causes the redistribution of flows in the chokes by the value of And To _p .

Is thread redistribution summarizing? with the corresponding sign with the previous value Κρθ, i.e. increases (with a positive value of Мd) or decreases (with a negative value of ΔΓ? αι) the fluid flow through the heater and, thereby, maintains the viscosity at the outlet within specified limits.

The regulator works not only with a heater, but also with a liquid cooler.

The nominal value; the fluid flow through the cooler is set equal to the fluid flow through the choke 5 with laminar flow.

The amount of fluid passing through the cooler decreases with increasing viscosity and increases with decreasing viscosity.

Since cooling the liquid increases its viscosity, with a decrease in it at the inlet to the regulator, the flow is redistributed between the chokes 5 and 7 in the direction of increasing it through the choke 5 and, accordingly, through the cooler 6.

Additional cooling of the fluids leads to maintaining a constant elm ts of bone.

The fluid viscosity regulator provides an extension of the control range and increased accuracy.

Claims (2)

The invention relates to a machine, in particular to devices for adjusting the viscosity of a liquid. A device for adjusting the viscosity of a liquid is known, which contains a viscometer and a temperature controller i. The closest in technical terms to the present invention is a device for adjusting the viscosity of a liquid, which contains pressure output piping connected to two parallel-mounted pipes disposed between them, in the first of which a laminar choke is installed and in the second a heater. A disadvantage of the known device is that it does not provide a smooth adjustment of viscosity, in a wide range of adjustment. The purpose of the invention is to expand the range of adjustment and improve the accuracy of the controller. This goal is achieved by the fact that the fluid viscosity regulator contains a turbulent choke installed in the second port in series with a heater. In addition, the regulator. Contains a chiller installed in the first pipe in series with laminar-. throttle. The figure shows the proposed fluid viscosity regulator. The regulator contains pressure 1 and output 2 pipelines, between which the first 3 and second 4 pipes are parallel, the first pipe 3 has a laminar choke 5 and cooler 6, and the second pipe 4 has a turbulent choke 7 and heater; 8. Cooler heater 8 is installed in the branch pipes in series, respectively, laminar and turbulent throttle m. The pressure in the pressure pipe 1 is created on the pump 9. The regulator operates as follows. Liquid with a certain viscosity comes from pump 9 through pressure pipe 1 to two parallel pipes 3 4, in which the jjeHbi are installed respectively with laminar and turbulent chokes, a cooler and a heater. After passing the nozzles, the streams are combined in the output pipe type 2. The laminar flow choke is filled with at least one cylindrical channel, whose parameters are determined by the ratio:, 794,105 where d is the channel diameter, is the channel length, P is the fuel density, dr - differential pressure4 on the choke. Turbulent Flow Throttle is in the form of a flat diagram. In operation, the principle of dependence of fluid flow on viscosity through a choke with a laminar flow outflow and flow rate independent of viscosity through a choke with a turbulent flow outflow is used. As the inlet viscosity increases, the amount of fluid passing through the turbulent circuit and heater 8 is increased, in which the fluid is heated to a certain temperature and the viscosity lowers it. At the outlet, the fluid flows are combined into a single stream with a higher temperature and lower viscosity than at the inlet. The ratio of the flow areas of the throttles 5 and 7 is chosen in such a way that the heating of the flow through the throttle 7j provides the shaft i at the outlet with the required fluid viscosity. Analytical: studies have obtained the following ratios of fluxes into droplets x Q Q .ag fj., Where V is the volume of fluid passing through the heater per unit time; Qj is the total flow of fluid passing through both throttles to the unit of eremeni; Kn-f. the ratio of the geometrical flow sections of chokes; turbulent droplet flow rate; kinematic viscosity of the fluid at the inlet to the regulator; laminar throttling length; the number of channels of laminar throttling. The viscosity at the outlet of the regulator depends on the fraction of the fluid passing through the heater, and this dependence is determined by the following Yablue empirical expression L)), where l), m is the viscosity of the fluid at the inlet q o to the regulator; inlet fluid temperature; fluid temperature at the outlet of the heater; empirical coefficient. Thus, for each initial viscosity Iq. there is a certain value Kp |, i.e. a certain amount of fluid. Passing through the heater, In turn, for each K there is one definite value of the output viscosity -). The ratio between and C, all other parameters being equal, is established by the K value, i.e. the ratio of the geometric cross sections of chokes 5 and 7J From the analysis of the above equations, it is seen that when the input signal of the regulator mismatches, which is expressed by the deviation of viscosity at the input to the regulator by the value,. the magnitude of the mismatch causes a redistribution of flows in the drossel x by the value of D Kf ,. The redistribution of the flow is summed with a corresponding sign with the previous value of Crr, i.e. increases (at a) (a) or decreases (at a negative value) the fluid flow through the heater and, thus, maintains the viscosity at the outlet within the specified limits. The regulator works not only with a heater, but also with a fluid cooler. The value of the nominal; fluid flow through the cooler is set equal to the magnitude of the fluid flow through the choke 5 with laminar flow. The amount of fluid passing through the cooler decreases with increasing viscosity and increases with decreasing viscosity. Since the cooling of the liquid improves its viscosity, with its decrease at the inlet to the regulator, the flow between the throttles 5 and 7 is redistributed towards its increase through the throttle 5 and, accordingly, through the cooler 6. Additional cooling of the liquid leads to maintaining a constant viscosity. The fluid viscosity regulator provides a wider range of adjustment and increased accuracy. Claims 1. A fluid viscosity regulator containing a pressure and an outlet pipe connected to two parallel-mounted pipes disposed between them, in the first of which a laminar choke is installed, and in the second - a heater, In order to expand the range of regulation and increase the accuracy of the regulator, it contains a turbulent choke installed in the second nozzle in series with the heater. 2. The regulator according to claim 1, which is based on the fact that it contains a cooler installed in the first pipe in series with the laminar choke. Sources of information taken into account in the examination 1. Bolshakov VF and Ginzburg L.G. Ship's small-sized diesel engines, L., Shipbuilding, 1971, pp. 146-147, fig.56. 2. Authors certificate of the USSR 67874, cl. G 05 D 24/02, 1943 (prototype). 1V