RU87856U1 - LIQUID INDUCTION HEATING DEVICE - Google Patents

Abstract

A device for induction heating of liquid media, comprising a cylindrical body with a cover and a bottom, an inner ring mounted above the bottom, and having through holes for passing a heated liquid medium, an inductor, an inlet pipe for a heated liquid medium, and an output pipe for a heated liquid medium, characterized in that it further comprises a central inner cylindrical channel mounted coaxially with the housing, while the upper part of the Central inner cylindrical channel is connected to the cover of the housing and on its surface, through holes are made for the passage of the heated liquid medium, and the lower part is connected to the outlet pipe for the heated liquid medium, the inductor is made in the form of a cylindrical cavity mounted between the housing and the central inner cylindrical channel with the formation of annular channels for the passage of the heated liquid medium while winding is installed inside the cylindrical cavity, hermetically pressed by a binder dielectric material, its upper part is connected to the lid of the housing sa, and the bottom with the inner ring.

Description

The utility model relates to electrical engineering, namely to devices for induction heating of liquid media, designed to heat liquid media that do not enter into active chemical interaction with elements of an induction heater, which can be used in heating and hot water systems in agricultural and domestic facilities.

A device for induction heating of liquid media, including one or more induction windings, covering one or more pipes with a liquid medium. The flow of the latter passes through a channel system in the form of a labyrinth from the internal channels with rings or spirals that form short-circuited electrical circuits; when the power is supplied to the induction windings, they heat up and accordingly heat the fluid in contact with them (EPO No. 0075811, Н05В 6/10, F24Н 1 / 10, 1983).

However, this device has a low efficiency, due to large energy losses due to the increased electrical resistance of the bulky design of the labyrinths; rings and spirals inside the maze prevent the rapid movement of warm fluid flows to the top of the device. In addition, it is difficult to manufacture, metal-intensive, since it contains many parts inside the labyrinths, and in its manufacture a large amount of copper wire is used in the windings due to the use of a low-frequency supply current (50 Hz).

A device for induction heating of liquid media, including at least one induction heater, comprising at least one induction winding with an electrothermal insulation gasket, covering a cylindrical magnetically conducting capacitance connected to the pipeline for supplying and discharging liquid through the inlet and outlet pipes, respectively, and connected in series with an AC regulator. The power source is alternating current with a frequency of 50 Hz (French application No. 2568083, Н05В 6/10, 1986).

However, this device has a low power factor (0.70-0.78), since during its operation there is heat dissipation in space from the external induction winding, and incomplete absorption of electromagnetic energy by the shell of the induction heater. A low power factor leads to a decrease in the efficiency of the device (up to 0.80-0.85), the indicator of which also reduces the ohmic losses on the induction winding of the device, which has a large number of turns of copper wire, which is associated with the use of a supply current of 50 Hz. The device is thick-walled, which makes the production of the device uneconomical.

As the closest analogue (prototype) adopted the known device for induction heating of a liquid, for example, water, described in patent SU No. 1019676 A1, H05B 6/10, 1983

The device comprises a cylindrical body with a cover and a bottom, an inner ring mounted in the lower part of the body above the bottom, and having through holes for the passage of a heated liquid medium, an inductor, an inlet pipe for a heated liquid medium and an outlet pipe for a heated liquid medium, a massive core installed inside the pipe with an annular gap and having through channels along the axis for the passage of the heated medium while the through channels are connected to the outlet pipe, and the annular gap at one end is connected to a connecting pipe, and on the other - with through channels of the core and the connection is covered by a casing adjacent to the pipe.

The specified device has the following disadvantages:

- when a water stream passes through the through channels under pressure, sediment (scale) particles are inevitably captured by the stream and deposited on the inner walls of these channels. As a result of scale deposition, the channel cross section decreases, thereby reducing the productivity of the device and its efficiency. Over time, the channels may become completely blocked, and the device may fail. Periodic maintenance work, in order to clean the channels, is difficult to carry out with a relatively large length and small diameter of the channels, which, in addition, leads to an increase in operating costs;

- limited heating rate due to heat dissipation from the outer surface of the winding tubes and a relatively small heating area, as a result of which the surface of direct contact of the inner walls of the pipes with the heated fluid is limited;

- the coefficient of useful conversion of electricity into heat is limited due to heat dissipation from the outer surface of the winding of the device;

- the manufacture of a massive core with through channels requires a relatively high cost of material and is difficult from the point of view of technology.

The objectives of the proposed utility model is to create a device for induction heating of liquid media, and not only for water, a simplified design that provides maximum heat transfer, leading to fast and stable heating.

The technical results of the proposed utility model are to increase the coefficient of performance (COP), to minimize the formation of scale and thereby increase the durability of the device, increase the reliability and stability of all structural elements of the device.

To achieve the technical result, a device for induction heating of liquid media has been developed, including a cylindrical body with a cover and a bottom, an inner ring mounted above the bottom and having through holes for the passage of a heated liquid medium, an inlet pipe for a heated liquid medium, and an outlet pipe for a heated liquid medium, the Central inner cylindrical channel mounted coaxially with the housing, while the upper part of the inner cylindrical channel is connected to the cover of the housing and through holes are made on its surface for the passage of the heated liquid medium, and the lower part is connected to the outlet pipe for the heated liquid medium. The device also includes an inductor made in the form of a cylindrical cavity mounted between the housing and the inner cylindrical channel with the formation of annular channels for the passage of the heated liquid medium, while inside the cylindrical cavity there is a winding sealed with a binder dielectric material; its upper part is connected to the housing cover, and the lower part to the inner ring.

The proposed device for induction heating of liquid media is illustrated by the following drawings, which are schematically presented:

figure 1 is a General view of the device, in section, side view;

figure 2 is a device from above, a section along aa of figure 1;

figure 3 - the device is "in operation" (showing the movement of the flow of heated water in the device), in section, side view;

figure 4 - device in isometry;

figure 5 is a variant of connecting the device to the water supply system when using it.

The proposed utility model of a device for induction heating of liquid media comprises a housing 1 (Figs. 1-5), a cover 2 (Figs. 1, 3, 4), a bottom 3 (Figs. 1, 3, 4), an inner ring 4 (Fig. 1 , 3, 4), through holes 5 (Figs. 1, 3, 4) of the ring 4, the inlet pipe 6 (Figs. 1-4) for a heated liquid medium, the outlet pipe 7 (Figs. 1, 3, 4), the central inner cylindrical channel 8 (Figs. 1-4), through holes 9 (Figs. 1, 3) of the inner cylindrical channel 8 for passage of a heated fluid, a cylindrical cavity 10 (Figs. 1-4) of the inductor, annular channels 11 (Figs. 1-4), winding 12 (Figs. 1-4), binders a dielectric material 13 (Figures 1-4).

When connecting the device for induction heating of liquid media in the water supply system (Fig. 5), it is necessary to have the device 1 itself, a main pipeline 14, an automation unit 15, a circulation pump 16, a storage tank 17, a pipe 18 for draining water to a consumer, and a device power supply circuit 19 1, circuit 20 of the hot water sensor, circuit 21 of the power supply of the circulation pump.

A device for induction heating of liquid media works as follows.

The principle of operation of the device is based on the heating property of the induction of the electromagnetic field generated by the winding 12, hermetically insulated by a dielectric material 13 and located inside the device 1 in a cylindrical cavity 10. The internal structural elements mounted in the device 1 having a cover 2 and a bottom 3 are arranged in such a way that form three working channels for the passage of the flow of the heated liquid medium, as illustrated in figure 3

The flow of heated water through the inlet pipe 6, enters the first annular channel 11, formed by the inner surface of the device 1 and the outer surface of the cylindrical cavity 10 of the inductor. Continuously crossing the lines of force of the magnetic field created in the cylindrical cavity 10 by the winding 12, the fluid flow is heated. Then, the flow of the heated medium through the holes 5 of the inner ring 4 is directed to the second annular channel 11 formed by the inner surface of the cylindrical cavity 10 of the inductor and the outer surface of the central inner cylindrical channel 8. The third heating of the liquid media under the action of the induction field is carried out in the cavity of the heated central inner cylindrical channel 8, where a stream of water enters through its through holes 9. A heated stream of liquid medium from a central inner cylindrical channel and 8 through the nozzle 7 is given to the consumer.

The water supply system in which the proposed device is used (Fig. 5) works as follows.

The inlet pipe 6 of the device 1 is connected to the main pipeline 14. The system is controlled by the automation unit 15. The power supply of the device 1 (power supply to the winding circuit 12, which creates an electromagnetic field) is carried out through the electric circuit 19. The circulation pump 16, at the output of the device 1, provides water pressure in system. The circulation pump 16 is connected to the automation unit 15 by means of an electric circuit 21. The pump 16 supplies water to the storage tank 17, in which a hot water level sensor is connected, connected to the automation unit 15 by a circuit 20. The automation is supplied with power to the circulation pump 16. Water passing through the device 1, is heated to a certain temperature and enters the storage tank 17. As water enters the tank 17, the water level sensor through circuit 20 transfers data to the automation unit 15. Upon reaching a predetermined indicator of the water level in the tank 17, the automation unit 15 turns off the power supply circuits 19 of the device 1 and the power supply circuits 21 of the circulation pump 16. The circulation pump 16 has a check valve system that prevents the return of hot water to the device 1. As the consumer uses water, it the level in the tank 17 decreases, which is controlled by the sensor along the circuit 20, and when the level decreases to a certain indicator, the automation unit 15 turns on the circuits 19 and 21 again.

As shown by tests of the proposed device in a production environment, the technical result (while maintaining a sufficiently high level of fire safety) is as follows:

- increases the coefficient of beneficial conversion of electricity into heat and increase the efficiency (efficiency) to an indicator equal to 0.99, due to the elimination of electrical losses;

- increases the rate of heating of liquid media due to the expansion of the surface of contact electric heating of media in contact with trekanal heat removal;

- in the claimed device, the heat of a heated liquid medium is transferred along a path that provides maximum and rapid heat transfer. The material used for metal parts of the device also contributes to fast and stable heating; thin-sheet ferromagnetic steel (high in iron), which quickly heats up and quickly transfers heat to the heated medium;

- with continuous and reusable crossing of the magnetic field of the inductor by the fluid flow (with an appropriate choice of its intensity), scale formation on the external and internal surfaces of the structural elements of the device is minimized and, therefore, the durability of the proposed device is increased;

The proposed device for induction heating of liquid media has a wide range of uses in heat supply systems, in particular in greenhouses, in rooms and in buildings for industrial purposes.

Claims (1)

A device for induction heating of liquid media, comprising a cylindrical body with a cover and a bottom, an inner ring mounted above the bottom, and having through holes for passing a heated liquid medium, an inductor, an inlet pipe for a heated liquid medium, and an output pipe for a heated liquid medium, characterized in that it further comprises a central inner cylindrical channel mounted coaxially with the housing, while the upper part of the Central inner cylindrical channel is connected to the cover of the housing and on its surface, through holes are made for the passage of the heated liquid medium, and the lower part is connected to the outlet pipe for the heated liquid medium, the inductor is made in the form of a cylindrical cavity mounted between the housing and the central inner cylindrical channel with the formation of annular channels for the passage of the heated liquid medium while winding is installed inside the cylindrical cavity, hermetically pressed by a binder dielectric material, its upper part is connected to the lid of the housing sa, and the bottom with the inner ring.