RU2797032C1 - Fluid induction heater - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: induction fluid heater includes a three-phase transformer made with a ferromagnetic core, with a primary winding located on the rods and a secondary winding, which is a heat exchanger for the heated fluid. The secondary winding is made in the form of three tubular coils. The heater includes a fluid supply pipeline connected to the first and second coils through the first and second fluid supply pipes. The end of the fluid supply line is connected to the third coil. The end of the fluid outlet conduit is connected to the first or third coil, and the fluid outlet conduit itself is connected to the remaining two coils via the third and fourth fluid outlet pipes. The fluid supply conduit is preferably installed at the bottom of the induction heater, and the fluid outlet conduit is installed at the top of the induction heater.

EFFECT: simplifying the design of the heater, as well as increasing its efficiency.

4 cl, 4 dwg

Description

The invention relates to electrical engineering, in particular to induction-type heaters, which are designed for heating fluids.

A technical solution is known from the prior art, which is an induction fluid heater, including a laminated three-phase core made of ferromagnetic material with a primary winding located on the rods, connected to an alternating current network, and a secondary electrically conductive winding, which is a heat exchanger for the heated fluid, with nozzles for inlet and fluid outlet. The heat exchanger consists of three chambers for heating the fluid, each of which is made of two cylinders of different diameters, installed concentrically one inside the other, connected at the top and bottom by end caps to form a sealed hollow chamber for heating the fluid in it, inside which rods with a primary winding, the turns of which are located in a horizontal plane with an air gap to form a closed loop around the corresponding core rod, each chamber has nozzles for the inlet and outlet of the fluid. Application for a patent of the Russian Federation No. 2006121117, IPC H05V 6/10, published on 01/10/2008.

It is also known a technical solution chosen as the closest analogue, which is an induction heater of liquid media, consisting of a three-phase transformer with a core made of sheet electrical steel, with primary windings located on the core rods, connected to an AC electrical network, and three secondary electrically conductive windings made of metal pipes wound around each primary winding of the transformer in one layer. The inlets and outlets of the pipes are hydraulically connected in parallel, and electrically closed by an external conductor. Pipes are connected to each coil by means of nozzles and additional pipes of complex shapes with bends to supply fluid to the coils. RF patent No. 138284, IPC H05V 6/00, F24H 1/10, published on 03/10/2014.

The distinctive features of the proposed technical solution is, in particular, that the induction fluid heater includes a fluid supply pipeline connected to the first and second coils through the first and second fluid supply pipe, while the end of the fluid supply pipeline is connected to a third coil, and a fluid outlet pipe, the end of which is connected to the first or third coil, connected to the remaining two coils through the third and fourth fluid outlet pipes.

The problem solved by the proposed device is to increase the efficiency and power factor of the induction heater and enable its use in systems with natural circulation, as well as when heated to high temperatures of fluids with forced circulation.

The technical result of the claimed technical solution is manifested in simplifying the design of the heater, reducing its material consumption, as well as increasing its efficiency.

The technical result is achieved by the fact that an induction fluid heater, including a three-phase transformer made with a ferromagnetic core, with a primary winding located on the rods, and a secondary winding, which is a heat exchanger for the heated fluid, while the secondary winding is made in the form of three tubular coils, includes a fluid supply pipeline connected to the first and second coils through the first and second fluid supply pipes, wherein the end of the fluid supply pipeline is connected to the third coil, and the fluid outlet pipeline, the end of which is connected to the first or third coil, connected to the other two coils through the third and fourth pipes for the outlet of the fluid.

Due to the fact that the induction fluid heater includes a fluid supply pipeline connected to the first and second coils through the first and second fluid supply pipes, while the end of the fluid supply pipeline is connected to the third coil, and the fluid outlet pipeline medium, the end of which is connected to the first or third coil, connected to the remaining two coils through the third and fourth pipe for the outlet of the fluid, the design is characterized by its simplicity and the most uniform circulation of the fluid. The design is made with a minimum number of branch pipes, which can be of any length corresponding to the dimensions. At the same time, one of the coils is connected directly to the pipeline itself. This design is characterized by reduced material consumption, which also affects the increase in heater efficiency by reducing power losses. In addition, this embodiment of pipelines with nozzles allows you to evenly supply and distribute the fluid without loss of pressure in the chambers. Thus, the claimed design makes it possible to increase the efficiency of converting electrical energy into thermal energy and the power factor. Another advantage of this design of the secondary winding is the reduction of the hydraulic resistance of the network, it is explained by the fact that the current medium enters through the supply pipeline into each coil in the direction of flow, then flows inside the coils through a spiral pipe and exits in the direction of movement into the fluid outlet pipeline, and thus the current environment has a minimum number of obstacles in its path.

Due to the fact that the fluid supply pipeline is installed at the bottom of the induction heater, and the fluid outlet pipeline is installed at its upper part, the induction heater is characterized by the ability to achieve increased power, which determines its efficiency.

Preferably, the fluid outlets to the coils are connected to the fluid supply conduit parallel to each other, and the fluid outlets to the coils are connected to the fluid outlet conduit in parallel to each other, which also achieves more uniform circulation and avoids the need for complexity. piping or piping designs. In addition, an increase in the efficiency of the heater is achieved due to the action of the principle of convection: heating the flowing medium causes it to expand and become lighter. Thus, under the influence of electromagnetic induction, the walls of the tubes of the chambers heat up, they transfer heat to the flowing medium, as a result, the highest temperature of the flowing medium is at the highest point of the chambers. According to the same principle, the inlet pipes are located at the bottom, since they supply a cold environment to the chamber.

The advantage of making the heat exchanger in the form of three tubular spiral coils connected to each other by a pipeline through nozzles is that there is no air in the secondary winding chambers, that is, all the air in the system will be removed along with the fluid flow, and therefore there will be no sections of the heat exchanger metal that are not interact with the coolant, and this is necessary so that the walls of the heat exchanger transfer thermal energy to the coolant and do not overheat. In addition, this embodiment of the heat exchanger eliminates the accumulation of debris in the chambers of the secondary winding.

Preferably, coil pipes are connected at the points of contact by a continuous weld, which ensures structural rigidity and avoids heat losses due to the absence of the need to use additional fasteners.

Due to the presence of three chambers, taking into account the declared design of pipelines and nozzles for the supply and output of the fluid, the induction heater is characterized by maximum efficiency, and at the same time, a simple design.

The claimed technical solution is further explained with the help of figures, which conditionally represent one of the possible versions of the induction heater for fluid media.

Figure 1 shows the frontal projection of the induction heater of current environments.

In FIG. 2 shows a top view of the fluid induction heater.

In FIG. 3 shows a side view of the induction fluid heater.

In FIG. 4 is a sectional side view of the fluid heating chamber.

In FIG. 1-4 are shown:

- rod (1) of the transformer core;

- chambers (2), (3), (4) for heating fluids;

- coil (5) of the primary winding;

- coil (6) of the secondary winding;

- pipeline (7) for supplying fluid;

- nozzles (8) (9) for supplying fluid;

- pipeline (10) for fluid outlet;

- nozzles (11) and (12) for fluid outlet.

Further, with reference to the figures, the design of the induction fluid heater is described.

An induction fluid heater comprising a three-phase transformer made with a ferromagnetic core with three rods (1).

On the rod (1) of the transformer core there is a coil (5) of the primary winding, and the secondary winding, which is a heat exchanger for the heated fluid.

The secondary winding of the transformer is made in the form of three tubular coils (6) forming three chambers (2), (3), (4) for heating fluids.

The induction heater includes a pipeline (7) for supplying a fluid connected to the first and second coils (6) of the chambers (2) and (3) for heating the fluid through the first branch pipe (8) and the second branch pipe (9) for supplying the fluid, wherein the end of the pipeline (7) for supplying the fluid is connected to the third coil (chamber (4) for heating the fluid).

The induction heater also includes a conduit (10) for fluid outlet, the end of which is connected to the first or third coil (6) (chambers (2) or (4), respectively), and connected to the remaining two coils (6) (chambers (3 ) and (2) or (4), respectively) through the third pipe (11) and the fourth pipe (12) for the outlet of the fluid.

Preferably, the fluid supply conduit (7) is installed at the bottom of the induction heater, and the fluid outlet conduit (10) is installed at the top of the induction heater.

Preferably, pipes (8) and (9) for supplying fluid to the coils (6) are connected to the pipeline (7) for supplying fluid parallel to each other, and pipes (11) and (12) for the outlet of fluid to the coils (6 ) are connected to the fluid outlet conduit (10) parallel to each other.

Preferably, the coils of the pipes of the coil (6) are connected at the points of contact by a continuous weld.

The claimed induction fluid heater operates as follows.

After filling the tubular coils (6) with a heated fluid medium through a pipeline (7), the primary winding (5) is connected to a three-phase current network using an electromagnetic starter, and the required heating temperature is set using a thermostatic control unit. In a ferromagnetic core with rods (1), an alternating magnetic flux is created, with which each coil (6) of chambers (2), (3), (4) is inductively connected to form a closed loop around the corresponding core rod (1). Under the influence of these flows (variable in time) currents are induced in the wall surfaces of the coils (6), causing them to heat up. Heat from the heated surfaces is transferred to the fluid medium in three coils (6) through the pipeline (7) through its end and nozzles (8) and (9) and flowing from the pipeline (10) through its end and nozzles (11) and (12).

The induction fluid heater can also be operated using alternative mains-switched control units or other energy sources.

The claimed induction fluid heater can be used for heating residential premises and buildings, for heating water and other fluids during various technological processes.

The presented figures, description of the design and use do not exhaust the possible options for execution and do not limit in any way the scope of the claimed technical solution. Other variants of execution and use within the scope of the claimed formula are possible. Depending on the purpose, the induction fluid heater can be manufactured in different sizes, colors and configurations.

Claims (4)

1. An induction fluid heater, including a three-phase transformer made with a ferromagnetic core, with a primary winding located on the rods and a secondary winding, which is a heat exchanger for the heated fluid, while the secondary winding is made in the form of three tubular coils, characterized in that it includes a pipeline for supplying fluid, connected to the first and second coils through the first and second pipe for supplying fluid, while the end of the pipeline for supplying fluid is connected to the third coil, and the pipeline for the outlet of the fluid, the end of which is connected to the first or third coil, connected to the remaining two coils through the third and fourth pipe for the outlet of the fluid. 2. An induction fluid heater according to claim 1, characterized in that the fluid supply conduit is installed at the bottom of the induction heater and the fluid outlet conduit is installed at the top of the induction heater. 3. The induction fluid heater according to claim 1, characterized in that the nozzles for supplying fluid to the coils are connected to the pipeline for supplying fluid in parallel to each other, and the nozzles for exiting fluid to the coils are connected to the pipeline for the outlet of fluid in parallel to each other friend. 4. The induction fluid heater according to claim 1, characterized in that the coils of the tubes of the coil are connected at the points of contact by a continuous weld.

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