RU2423802C1 - Device for induction heating of liquid media - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device of induction heating of liquid media comprises a cylindrical body with a cover and a bottom, a ring with slots, a central cylindrical channel, an inductor arranged in the form of a cylinder and mounted on the ring with slots to form circular channels for circulation of a heated liquid medium, a winding, which is tightly pressed by a binding dielectric material, the upper part of which is connected to the body cover, and the lower one - with the ring, input and output nozzles, the device is additionally equipped with two cylinders, which are coaxially installed and mounted to form circular channels for circulation of the heated liquid medium, and three rings with slots, at the same time the first ring is mounted above the input nozzle and serves as a prop for the first cylinder installed at the external side of the inductor, the second ring is mounted in the lower part of the second cylinder installed between the inductor and the central cylindrical channel and serves as a prop for the central cylindrical channel, and the third ring arranged of two parts is mounted under the device cover and serves to limit the upper parts of the first and second cylinders, besides, the input and output nozzles are installed along the same axis.

EFFECT: increased power ratio.

3 dwg

Description

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

A device for induction heating of liquid media containing an inductor (winding), a ferromagnetic magnetic circuit, made in the form of coaxial hollow pipes with a gap for the passage of fluid in which the outer is non-magnetic.

(GDR patent No. 46314, 21h 18/29, 1966)

The disadvantages of this device are low energy performance and, accordingly, the power factor due to the uneven heating of the inner and outer pipes and the dependence of the temperature of the heated fluid on the flow.

A device for induction heating of liquid media, comprising at least one induction heater, comprising at least one induction winding with an electrothermal insulation gasket, covering a cylindrical magnetically conducting capacitance connected to a 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 rate of which is reduced, and ohmic losses on the induction winding of the device having a large number of turns of copper wire, which is associated with the use of a supply current of 50 Hz.

A device is known for induction heating a liquid, for example, water, comprising 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 passing 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 nym nozzle and annular gap with one end connected to the inlet pipe and the other - with the through channels and the junction core covered by shroud adjacent to the pipe.

(Patent SU No. 1019676 A1, H05B 6/10, 1983)

The disadvantages of this device are that when a water stream passes through the through channels under pressure, sediment particles (scale) 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. With a relatively large length and small diameter of the channels, preventive work, with the aim of cleaning the channels, is difficult to carry out. In addition, the coefficient of beneficial conversion of electricity into heat due to heat dissipation from the outer surface of the winding of the device is limited, and the manufacture of a massive core with through channels requires relatively large production costs and complicates the production technology.

As the closest analogue (prototype) adopted the known device for induction heating of liquid media, described in the patent for utility model "Device for induction heating of liquid media" (patent No. 87856 from 06/02/2009).

According to the aforementioned patent, the device for induction heating of liquid media includes a cylindrical body with a cover and a bottom, an inner ring with slots mounted above the bottom, an inlet and an outlet pipe, a central cylindrical channel mounted coaxially with the body, while the upper part of the cylindrical channel is connected to the housing cover and on its surface in this part, through holes are made for the passage of the heated liquid medium, and the lower part of the channel is connected to the outlet pipe. The device also contains an inductor made in the form of a cylinder in which the winding is placed, while the inductor is mounted on the inner ring with slots between the housing and the cylindrical channel to form annular channels for the passage of the heated liquid medium, and its winding is hermetically pressed by a binder dielectric material the upper part is connected to the housing cover, and the lower - to the inner ring with slots.

The disadvantages of the known prototype device are:

- a relatively low power factor and efficiency of the device due to the low speed and area of heating of the liquid medium, significant scattering of magnetic fluxes and, as a result, large heat loss;

- the device is designed to use relatively small volumes of liquid media.

The present invention is directed to solving technical problems of creating a device for induction heating of liquid media, providing maximum heat transfer, leading to fast and stable heating of a large volume of liquid media while maintaining the reliability of the device and reducing its operating costs.

The technical result achieved in this case is to increase the power factor and, accordingly, the efficiency (efficiency) of the device, use the device with both single-phase and three-phase power supplies, increase the service life, reliability and stability.

The specified technical result is achieved by the fact that the known device for induction heating of liquid media containing a cylindrical body with a cover and a bottom, a ring with slots, a central cylindrical channel, an inductor made in the form of a cylinder and mounted on a ring with slots with the formation of annular channels for circulation of the heated liquid medium and containing a winding hermetically pressed by a binder dielectric material, the upper part of which is connected to the housing cover, and the lower - to the ring, input and output the bottom of the nozzle, the device is additionally equipped with two cylinders, coaxially mounted and mounted with the formation of annular channels for circulation of the heated liquid medium, and three rings with slots, while the first ring is mounted under the inlet pipe and serves as a stop for the first cylinder mounted on the outside of the inductor , the second ring is mounted in the lower part of the second cylinder installed between the inductor and the Central cylindrical channel and serves as a stop for the Central cylindrical anal, and the third ring made of two parts, the device is mounted under the lid and serves to limit the upper portions of the first and second cylinders, the inlet and outlet pipes are installed along one axis.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the required technical results.

The present invention is illustrated by a specific example, which clearly demonstrates the possibility of achieving the above set of features of the desired technical result.

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

figure 2 is a section along aa of figure 1;

figure 3 is a section along BB of figure 1.

A device for induction heating of liquid media, comprising a cylindrical body 1 with a cover 2 and a bottom 3, a ring 4 with slots, a central cylindrical channel 5, an inductor 6 made in the form of a cylinder and mounted on a ring 4 with slots with the formation of annular channels for circulation of the heated liquid medium and containing a winding 7, hermetically pressed by a binder dielectric material, the upper part of which is connected to the cover 2 of the housing 1, and the lower - to the ring 4, the input and output pipes 8 and 9, respectively, in addition, the device The property is additionally equipped with two cylinders 10 and 11, coaxially mounted and mounted with the formation of annular channels for circulation of the heated liquid medium, and three rings with slots, the first ring 12 being mounted under the inlet pipe and serving as a stop for the first cylinder 10 mounted on the outside of the inductor 6, the second ring 13 is mounted in the lower part of the second cylinder 11, mounted between the inductor 6 and the Central cylindrical channel 5, and serves as a stop for the Central cylindrical channel 5, and the third ring 14, made of two parts, is mounted under the cover 2 and serves to limit the upper parts of the first and second cylinders 10 and 11, and the inlet and outlet pipes 8 and 9 are installed along one axis.

A device for induction heating of liquid media is used as follows.

The inductor winding 6 connected to the cover 2 of the device is connected to the network. Power can be supplied from a network of either a three-phase or a single-phase alternating current. The number of turns and the cross section of the coil wire are designed in such a way that when passing a heated fluid, optimal heating is ensured for a given volume of water. Water heating is carried out according to the principle based on the property of induction of the electromagnetic field created by the winding 7, hermetically insulated by a dielectric material and located inside the inductor 6. If necessary, a Mayevsky cock can be installed in the upper part of the device, which will allow air to be removed from the device at the initial stage of its operation .

The flow of heated fluid through the inlet pipe 8 of the bottom 3 and the slots (openings) of the ring 12 enters the first annular channel of the device, formed by the surface of the housing 1 and the outer surface of the first cylinder 10. In the channel, the fluid moves in the direction from the bottom up, while crossing the lines of force of the electromagnetic field , it heats up.

In the upper part of the device, the fluid flow through the slots of the ring 14, circulating in the direction from top to bottom, enters the second annular channel formed by the inner surface of the first cylinder 10 and the outer surface of the inductor 6, and heats up.

Next, the fluid flow through the slots of the ring 4 and in the direction from the bottom up goes to the third annular channel formed by the inner surface of the inductor 6 and the outer surface of the second cylinder 11, and heats up.

From the third channel, the liquid through the slots of the ring 14 and in the direction from top to bottom enters the fourth channel, formed by the inner surface of the second cylinder 11 and the outer surface of the central cylindrical channel 5, and heats up.

The flow of heated fluid from the fourth annular channel through the slots of the ring 13 and in the direction from the bottom up goes into the cavity of the Central cylindrical channel 5 and then through the outlet pipe 9 enters the consumer.

The inlet and outlet nozzles 8 and 9 are mounted in the device along one axis, which allows expanding the conditions of consumer demand, for example, using it in any position (vertically, obliquely, horizontally) and at the same time simplifies the production issues of connecting the device to the consumer. The height of the device depends on its power factor: the higher this indicator, the higher the height of the device.

Compared with the known device (prototype), the proposed one provides an increase in the coefficient of useful conversion of electric energy into thermal energy, an increase in power factor, and reduces the heat loss spent on heating the environment; in operation, the outside of the case is cold.

The claimed device also allows to increase the rate of heating of liquid media by expanding the surface of contact heating; five-channel heat removal provides optimal heating and, as practice has shown, even with large volumes of heated media.

Rapid and stable heating is also facilitated by the materials used for the elements of the device, in particular, the use of thin-sheet ferromagnetic steel (high iron content) with a special anti-corrosion coating, heat transfer silicones, two-component sealants, transformer oil are used for heat removal from winding 7. After winding it, it is impregnated with a special varnish, and between the turns use glass-lacquer strips to protect the inter-turn circuit.

The claimed device does not have a negative impact on humans, it is implemented on an industrial scale, where it showed full compliance with the problem being solved and the results achieved.

Claims (1)

A device for induction heating of liquid media, comprising a cylindrical body with a cover and a bottom, a ring with slots, a central cylindrical channel, an inductor made in the form of a cylinder and mounted on a ring with slots with the formation of ring channels for circulation of the heated liquid medium and containing a winding hermetically pressed by a binder dielectric material, the upper part of which is connected to the housing cover, and the lower one to the ring, inlet and outlet nozzles, characterized in that the device is additionally Shown with two cylinders, coaxially mounted and mounted with the formation of annular channels for circulation of the heated liquid medium, and three rings with slots, the first ring mounted above the inlet pipe and serves as a stop for the first cylinder mounted on the outside of the inductor, the second ring is mounted in the lower part of the second cylinder mounted between the inductor and the Central cylindrical channel and serves as a stop for the Central cylindrical channel, and the third ring, made of two parts, mounted under the cover of the device and serves to limit the upper parts of the first and second cylinders, while the inlet and outlet nozzles are installed along one axis.

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