RU2750178C1 - Low viscosity turbulent heater - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the design of rotary flute pumps designed for efficient heating of low-viscosity liquids pumped with low pressure: water, gasoline, kerosene in heating systems and tanks of residential and industrial premises. A low viscosity turbulent heater contains housing with inlet and outlet pipes, respectively, of cold and heated liquid with low viscosity, a rotor with injection and return grooves, installed in bearings and driven in rotation by an electric motor. The rotor is made of a heater having the same number of injection and return grooves and a supercharger having only injection grooves. Holes with a diameter of 1.2 to 1.6 of the width of the grooves and a depth of 1.1 to 1.4 of the diameter of the holes are made on the heater, at the intersection of the injection and return grooves in the gap between the walls of the injection and return grooves,.

EFFECT: invention is aimed at creating a device that provides a more intense turbulent flow of a liquid with a low viscosity, and, due to this, its more efficient heating.

3 cl, 2 dwg, 2 tbl

Description

The invention relates to the design of rotary-flute pumps designed for efficient heating of low-viscosity liquids pumped with low pressure, gasoline, kerosene, water in heating systems and tanks.

Known and used in industry, labyrinth-screw pumps, consisting of a housing, a rotor with helical grooves for pumping viscous liquids, as well as rotor bearings, fluid inlet and outlet pipes, and an electric motor, to drive the rotor into rotation (see A. S. Labyrinth-screw pumps and seals for corrosive environments.M .: Mashinostroenie, 1981, p. 4, Fig. 2).

The disadvantage of the described design is the low efficiency of heating viscous liquids.

This disadvantage is eliminated in a screw groove pump (prototype), which includes a housing, a rotor with injection grooves and return grooves, a rotor installed in bearings, while the housing is equipped with a pipe supplying a cold viscous liquid and a pipe that removes the heated liquid, and an electric motor driving the rotor into rotation (see RU 2468306, IPC F24J 3/00 "Turbulent heater" VN Grinavtsev, OV Grinavtsev, VB Chernogil, AO Ganul, publ. 27.11.2012, bul. 33).

The disadvantage of this design is that at the intersection of the injection grooves and the return grooves of the rotor, zones of rupture are formed between the walls of the injection and return grooves, which reduces the turbulence of a liquid with a low viscosity of water, gasoline, kerosene, and, consequently, reduces the intensity of heating.

From the theory of hydrodynamics it is known that an increase in flow turbulence, and, consequently, an increase in heat release in a liquid, occurs when an obstacle appears in the flow path (see Chugaev PP, Hydraulics. Textbook for High Schools, 4th edition, Energoizdat. 1982, 672 s.). The obstruction may be protruding into the stream bed, as shown in fig. 4-28 (see Chugaev PP, Hydraulics., Energoizdat. 1982, p. 182, Fig. 4-28), or recessed below the flow level (see Chugaev PP, Hydraulics. Textbook for universities, 4th edition, Energoizdat. 1982, 672 p., Fig. 4-16), being a notch.

The technical problem of the present invention is to provide a device that provides a more intense turbulent flow of a liquid with a low viscosity, and, as a result, its more efficient heating.

The technical problem posed is solved due to the fact that a heater of a turbulent liquid with a low viscosity of water, gasoline, kerosene, including a housing, a rotor with injection grooves and return grooves, and the rotor installed in bearings, while the housing is equipped with a pipe allowing cold liquid with low viscosity water, gasoline, kerosene and a branch pipe that removes a heated liquid with a low viscosity water, gasoline, kerosene, an electric motor, the rotor is made of a heater having the same number of injection grooves and return grooves and a supercharger having only injection grooves, while on the heater when crossing of the injection grooves and return grooves in the gap between the walls of the injection grooves and return grooves, holes with a diameter of 1.2 to 1.6 of the groove width and a depth of 1.1 to 1.4 of the hole diameter are made, and the injection grooves and return grooves have the same width and depth, in addition, the number of injection grooves and the number of return grooves ok heater is the same.

The holes are made by an end mill (in some sources referred to as finger), which has a cylindrical shape (see "Quick reference guide of a metal worker" edited by AN Malov et al. M .: "Mechanical engineering". 1965, p. 707).

The invention is illustrated by a drawing in which:

FIG. 1 - Schematic representation of a turbulent heater.

FIG. 2 - Sectional view of the heater rotor along the hole.

A turbulent heater for heating a liquid with a low viscosity of water, gasoline, kerosene consists (Fig. 1) of a housing 1 closed by covers 2 with screws 3. The covers 2 are fitted with bearings 4, in which the rotor 5 rotates, which is driven by an electric motor 6 through clutch 7. Rotor 5 has a heater 8 with injection grooves 9, and return grooves 10, and a blower 11 with injection grooves 12, while the injection grooves 12 of the heater 8 are a continuation of the injection grooves 9 of the heater 8, and have the same width B1 and depth h1 ... The width B1 of the grooves 9 of the booster heater 8 with the same width B2 and the depth h2 of inverse grooves 10. The heater 8 has a zone 13 between the walls 14 of the grooves 9 of the booster 15 and the walls of inverse grooves 10 are formed (FIG. 2) the holes 16, _holes whose diameter d is equal to from 1.2 to 1.6 groove widths and a depth of 1.1 to 1.4 hole diameters. During experimental studies, it was experimentally found that with a hole diameter equal to less than 1.1 of the width B1 of the injection groove, the efficiency of heating a liquid with a low viscosity with water, gasoline, and kerosene decreases. With a hole diameter of more than 1.6 of the width B1 of the injection grooves, the pumping rate of low-viscosity liquid water, gasoline, and kerosene decreases. Also, during the experiments, it was found that when the hole depth is less than 1.1 B1 of the injection grooves, a decrease in the temperature rise of the pumped liquid with low viscosity of water, gasoline, kerosene is observed. When the hole depth is more than 1.4 of the width B1 of the injection groove, the power consumption for heating the pumped liquid with low viscosity of water, gasoline, kerosene increases.

The body 1 has nozzles 17 for supplying a cold liquid with a low viscosity of water, gasoline, kerosene and a nozzle 18 for removing a hot liquid with a low viscosity of water, gasoline, and kerosene.

The proposed heater turbulent liquid with low viscosity of water, gasoline, kerosene works as follows.

When electricity is supplied, the electric motor 6 drives the rotor 5 into rotation through the clutch 7, the pumping grooves 9 capture the liquid with a low viscosity through the nozzle 17, water, gasoline, kerosene create a flow, and the return grooves 10 create a counter flow. As a result of their collision, high turbulence develops, as a result, intense heat release due to internal friction. But at the intersection of the injection grooves 9 and the return grooves 10, zones 13 are formed, the breaks bounded by the walls 14 of the injection groove 9 and the walls 15 of the return grooves 10 (this is due to the production technology of the rotor 5), which causes a loss of turbulence. To restore the turbulence intensity in the areas 13 provided with holes 16 with a diameter d _{of holes} which are an obstacle, recessed below the channel flow which, in accordance with a hydrodynamic theory (see. PP Chuguyiv, hydraulics, textbook for universities, 4th edition, Energoizdat 1982 , 672 p., Fig. 4-16) increases the turbulence of the flow, and, consequently, the internal friction and heating of the liquid. The supercharger 11 provides, due to the injection grooves 12, a predetermined pressure of a hot liquid with a low viscosity, water, gasoline, kerosene at the outlet in the branch pipe 18. The rotor 5 rotates in bearings 4 installed in the covers 2, attached to the housing 1 by screws 3.

In accordance with the invention, an installation has been developed and manufactured, including a turbulent heater for heating water: → a container with a volume of 5 kg of water, an electric motor 4A71UZ with a power of 0.74 kW, with a speed of P _dv = 3000 rpm, a belt drive, the driving pulley of which has the diameter is 140 mm, and the slave has a diameter of 70 mm. To determine the effect of the holes on water heating, two rotors were made:

- the primary version of the rotor had injection grooves and return grooves;

- the second variant had injection grooves and return grooves with the same number of starts, the same pitch with the first rotor, but in the areas of intersection of the injection grooves and return grooves made by drilling holes, in accordance with the invention.

The turbulent heater is connected by turbine pipelines with a tank filled with five kilograms of water. The temperature in the tank was measured with D8181B20 semiconductor sensors, the current temperature was recorded on a hard disk with the power of an ATiny45 microcontroller, the power consumption of the electric motor was recorded using a CA8335 power quality analyzer.

The parameters of the rotors of the first and second options are as follows:

- rotor diameter 80 mm;

- rotor length 80 mm;

- the width of the injection grooves and return grooves is 5 mm;

- the depth of the injection grooves and return grooves is 3.8 mm;

- rotor speed P _p = 6000 rpm.

The second version of the rotor has holes, in accordance with the wording of the invention:

- hole diameter 7.0 mm;

- hole depth 8.4 mm.

When heating 5 kg of water, in the presence of the rotor of the first option, without holes, the results are obtained, which are shown in Table 1. After changing the rotor in the zone of intersection of the injection grooves, 5 kg of water was heated, the results are shown in Table 2.

The analysis given in table 1 and table 2 shows that when making holes in the zones of intersection of the injection grooves and return grooves, in accordance with the claims, it has shown a positive effect on energy saving when heating water.

The introduction of the proposed invention in the industry for heating residential and industrial premises for heating oil products in vehicles allows you to obtain a significant economic effect.

Claims (3)

1. Heater turbulent liquid with low viscosity, including a housing equipped with a pipe supplying a cold liquid with a low viscosity and a pipe that removes a heated liquid with a low viscosity, a rotor with injection grooves and return grooves, installed in bearings, and an electric motor driving the rotor into rotation, characterized in that the rotor is made of a heater having the same number of injection grooves and return grooves, and a supercharger having only injection grooves, while on the heater at the intersection of the injection grooves and return grooves in the gap between the walls of the injection grooves and return grooves holes with a diameter of 1.2 to 1.6 of the width of the grooves and a depth of 1.1 to 1.4 of the hole diameter. 2. A heater according to claim 1, wherein the delivery grooves and return grooves are of the same width and depth. 3. The heater according to claim 1, wherein the heater has the same number of injection grooves and return grooves.

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