Electric stove

Abstract

The present device relates to the field of electrical engineering, and more particularly to the structure of an electric heating device for providing heat and generating steam, and can be used for equipping steam rooms and saunas. The device comprises a housing containing a convection unit with electrically conductive coils and a control unit. Mounted inside the convection unit with clearance for the passage of air is an enclosed rock holder module having heat-retaining elements, a heating element and a temperature sensor. The convection unit with the enclosed rock holder module is fastened to the body of a base of the device, the device is enclosed by a casing made from a heat insulating mixture, a lid of the rock holder is in the form of a conical funnel with an outwardly projecting pipe that has equidistantly spaced holes about its outer periphery and a water distributor at the bottom in the form of a cone with holes, and the outer surface of the pipe has a row of slots with a nozzle thereabove.

Description

ELECTRIC OVEN

[0001] The device relates to the field of electrical engineering, in particular, to the design of an electric heating device intended for heating and steam generation, and can be used to equip baths and saunas.

[0002] The Helo RONDO thermos stove is known, URL: https: / helo-its.ru / content / helo-rondo (date of access 11 / 24 / 23), consisting of a heat-insulated body and lid, a tubular electric heater (TEN) inside the body, a temperature sensor (thermocouple). Heat is accumulated by stones, which are loosely laid between the TENs and withstand high temperatures, generating steam when water hits them, URL: https: / helo-its.ru / content / kamni (date of access 11 / 24 / 23). The operating principle consists in heating up heat-accumulating materials with the help of heating elements, while the air in the steam room is heated due to air convection through the heat-accumulating material. The temperature directly in the steam room is adjusted by means of the internal heater by opening / closing the lid of the body, while the temperature of the heat-accumulating material decreases, which leads to a decrease in the volume of steam generated.

[0003] The closest analogue is the device "Electric stove" (patent RU2792382C1), which is a frame structure with a metal case, in the cover of which a bowl of an external decorative heater and a convection grate are mounted, through which hot air enters the room. Inside the frame structure with a metal case, a module of a closed heater with heat-accumulating elements for creating fine steam is installed, and, located under it, a convector heater. Inside the closed heater there is a structure of profile pipes with a number of holes for supplying water to the heat-accumulating elements. A convection channel box is adjacent to the rear wall of the device body, its upper part goes under the convection grate of the device cover.Several heating coils are installed inside the convector heater, which are connected to a remote electronic control unit in the form of a panel, which contains an information output device and temperature control relay units, via a terminal module fixed to the outside of the frame structure. Heating elements and a thermocouple temperature sensor located in a closed heater, an air temperature sensor located in the steam room are also connected to the terminal module. The remote control unit can be used to set the air temperature in the steam room and the temperature in the closed heater.

[0004] Incorrect air temperature setting in a closed heater (caused by human factor: too low or too high temperature is indicated) leads to the fact that, often, the set temperature in a closed heater is insufficient or excessive to obtain finely dispersed steam of good quality. If the heating coils of the convector heater fail, to replace it, it is necessary to carry out complex dismantling of the convector heater, which complicates the maintenance of the electric heater; the design of profile pipes with a number of holes for supplying water to a closed heater takes up a lot of space, the holes in it become clogged over time when using hard water, which reduces the time for high-temperature heating of the heat-accumulating elements, and requires periodic disassembly of the device structure, removal of the heat-accumulating elements and cleaning of the holes.All this taken together leads to the fact that providing high-temperature heating of the heat-accumulating elements of a closed heater while simultaneously maintaining the air temperature in the steam room by the convector to obtain the best steam generation mode becomes more difficult.

[0005] An electric stove comprising a housing, inside which a convection unit, conductive spirals and a closed heater module with heat-accumulating elements, a heating element and a temperature sensor are placed, a heater cover with a branch pipe, on the outer surface of the branch pipe a row of slots with a nozzle above them is made, characterized in that the conductive spirals are wound, one after another, around the cylinder of the convection unit, the closed heater module is located inside the convection unit with an air gap of at least 25 mm, the gap between them is closed at the top, the heater cover is made in the form of a cone-shaped funnel, on the outside of the funnel, below the upper horizontal platform of the heater cover, two ribs are welded in a circle, at some distance from each other, the heater cover branch pipe protrudes outward and has uniformly distributed holes along its outer circumference, the branch pipe enters the closed heater and has a water distributor at the bottom,in the form of a cone tapering downwards with uniformly distributed holes on it, the convection unit with a closed heater module is attached to the body of the base of the device, an opening is made in the lower part of the base of the device, on the upper surface of the base of the device, along the perimeter, longitudinal cutouts are located in several rows, at the bottom, on the base of the convection unit, an electronic control unit is fixed, the control panel is fixed in the opening on the side wall of the base, the device is closed with a casing in the form of a cylinder made of heat-insulating mixture, fixed in a circular groove of the base of the device, screw legs are located along the perimeter of the base of the device, at least 20 mm high.

[0006] The conductive coils can be held around the convection block cylinder by means of comb insulators.

[0007] A decorative design can be applied to the device casing.

[0008] The task that this technical solution is aimed at solving is to improve the consumer properties of the device by providing high-temperature heating of the heat-accumulating elements of the closed heater while simultaneously maintaining the required constant air temperature in the steam room by the convector to obtain the best steam generation mode.

[0009] The technical result is the creation of a device design that ensures a stable high-temperature heating mode for the heat-accumulating elements of a closed heater while simultaneously maintaining the required constant air temperature in the steam room by the device's convector to obtain the best steam generation mode.

[0010] The result is achieved by the declared device, consisting of a convection block with external heating spirals and the base of the device, made in the form of vertically oriented cylinders, closed from the outside by a casing and a lid of the heater on top. Inside the convection block there is a module of a closed heater with an air gap with a heating element and a temperature sensor inside.

[0011] The device casing is made in the form of a cylinder made of heat-insulating mixture with a decorative pattern applied to it and fixed in a circular groove of the device base. The casing protects the device from infrared radiation and mechanical damage.

[0012] The base of the device has the shape of a closed cylinder, on the upper platform of which four corners are fixed, with the help of which the convection unit with the closed heater module is fixed on top of it.

[0013] In the lower part of the base of the device there is an opening to provide an inflow of cold air into the base of the device. On the upper surface of the base of the device, along the perimeter, there are longitudinal cutouts in several rows to supply cold air into the device to the heating coils of the convection block.

[0014] At the bottom, on the base of the convection unit, the electronic control unit is fixed, and the control panel itself is fixed in the opening on the side wall of the device. Along the perimeter of the base of the device, there are four screw legs, at least 20 mm high, to ensure the flow of sufficient cold air into the convection unit.

[0015] The control unit is connected to a temperature sensor for the air in the steam room and a temperature sensor installed in the closed heater module. When the temperature of the closed heater reaches +510° C, heating automatically stops. It has been experimentally established that this temperature is the best for obtaining high-quality finely dispersed steam.

[0016] The closed heater module is a closed cylinder made of 1 mm thick metal sheet, the bottom of the cylinder is made of 3 mm thick sheet, and the diameter of the bottom is larger than the diameter of the cylinder. A vertical metal strip is welded along the perimeter of the bottom, serving as a guide for the outer surface of the convection block and providing a fixed air gap between the closed heater and the convection block.

[0017] At the bottom of the closed heater module there is a heating element with a power of 1.5 kW, around which heat-accumulating material is laid, and a closed heater temperature sensor.

[0018] The convection block is a cylinder made of a 1 mm thick metal sheet. Along the outer diameter of the convection block cylinder there are at least eight comb-shaped insulators made of electrical and thermal insulation material, which are fixed to the cylinder wall using vertical corners. Conductive spirals are wound around the convection block cylinder, one after another, the number of which depends on the size of the steam room area.

[0019] The air gap between the convection block cylinder and the closed heater module is at least 25 mm, and the gap between them is covered with a flat rim from above. This provides a "thermos" effect, which allows maintaining the temperature regime set in the closed heater and ensuring the production of high-quality fine-dispersed steam in the steam room.

[0020] On top of the device there is a heater cover, consisting of an outer heater bowl, which is a conical filling funnel with a pipe protruding in the center and welded from the inside with a flat round outer surface, on which there is a nozzle, covering oval oblong holes, used for the release of finely dispersed steam.

[0021] Along the outer circumference of the heater cover there is a narrow horizontal platform, below it, on the outer side of the funnel, with the help of corners, two ribs are additionally welded in a circle, which serve to release warm air from the device into the steam room and visually form, together with the upper platform, a decorative grille.

[0022] The bowl of the heater cover serves as a container for decorative stones and water supply to the closed heater. The heater cover branch pipe on the outside has evenly distributed holes along its circumference for water supply to the inner heater, the branch pipe itself enters the closed heater by 60-70 mm and has a water distributor at the bottom, in the form of a cone tapering downwards welded to the branch pipe with evenly distributed holes on it. Water through the holes in the branch pipe and the water distributor gets inside the closed heater and is distributed over the heat-accumulating material, while the main part of the water gets into the center of the closed heater, onto the maximally heated heat-accumulating material, which ensures the production of a large volume of finely dispersed steam. Figure 1

[0023] The general view of the device without the casing is shown. Figure 2

[0024] A general view of the device with a casing is shown. Figure 3

[0025] The convection block is presented. Figure 4

[0026] A closed heater module is presented. Figure 5

[0027] The stove cover is shown. Figure 6

[0028] The bottom view of the device is shown.

[0029] As shown in, the device is a structure consisting of a convection unit 1 with external heating coils 2 and a device base 3 made in the form of vertically oriented cylinders closed on the outside as shown in the casing 4 and the heater cover 5. Inside the convection unit 1, a closed heater module 6 (,) with a heating element 7 () and a temperature sensor 8 () inside is located with an air gap of at least 25 mm. The gap is closed from above by a flat rim 9. The base of the device 3 has the form of a closed cylinder, on the upper platform of which four corners 10 are fixed, with the help of which the closed heater module 6 is fixed to it from above. On the upper surface of the base of the device 3, along the perimeter, longitudinal cutouts 11 are located in several rows for supplying cold air into the device to the heating coils 2 of the convection unit 1. On the side wall of the base of the device 3, a control panel 12 is fixed in an opening.

[0030] As shown in, the casing of the device 4 is made in the form of a cylinder made of a heat-insulating mixture with a decorative pattern applied to it, and fixed in a circular groove of the base of the device 3 () with a cutout for the control panel 12.

[0031] As shown, the convection block 1 () is a cylinder made of a metal sheet 1 mm thick. Along the outer diameter of the cylinder of the convection block 1, there are at least eight comb-shaped insulators 13 made of electrical and thermal insulation material, which are fixed to the wall of the cylinder using vertical corners 14. Heating coils 2 are wound around the cylinder of the convection block 1, one after the other.

[0032] As shown in, the module of the closed heater 6 () is a cylinder made of sheet metal, with the diameter of the bottom being larger than the diameter of the cylinder. A vertical metal strip 15 is welded along the perimeter of the bottom, serving as a guide for the convection unit 1 (,). A heating element 7 with a power of 1.5 kW is installed on the bottom of the module of the closed heater 6, around which heat-accumulating material is laid during operation of the device, and a temperature sensor 8 of the closed heater.

[0033] As shown in, the heater cover 5 () consists of an outer heater bowl 16, which is a filling conical funnel with a pipe 17 protruding in the center and welded from the inside with a flat round outer surface, on which a nozzle 18 is located, closing the oval oblong holes, which serve for the outlet of finely dispersed steam for the outlet of steam. Along the outer circumference of the heater cover 5 there is a narrow horizontal platform 19, below it, on the outer side of the funnel, with the help of corners 20, two ribs 21 are additionally welded in a circle for the outlet of warm air from the device. The branch pipe 17 of the heater cover 5 has uniformly distributed holes on the outside along its circumference for supplying water to the internal closed heater; the branch pipe 17 itself enters the closed heater 5 by 60-70 mm and has a water distributor 22 at the bottom, in the form of a cone tapering downwards welded to the branch pipe with uniformly distributed holes on it.The bowl of the heater cover 16 serves as a container for decorative stones and for supplying water into the closed heater onto the heat-accumulating material to produce finely dispersed steam.

[0034] As shown in, in the lower part of the base of the device 3 () there is an opening 23 for providing an inflow of cold air into the device, on the base of the convection unit 1 an electronic control unit 24 is fixed at the bottom. An external air temperature sensor in the steam room 25 () is connected to the control unit 24. Along the perimeter of the base of the device there are four screw legs 26, not less than 20 mm high.

[0035] The device operates as follows. The device is installed in the steam room. The internal space of the closed heater module 6 and the bowl of the heater cover 16 are filled with heat-accumulating material.

[0036] Using control panel 12, the air temperature in the steam room is set, at the same time a fixed air temperature in the closed heater module 6 is automatically set at +510 °C and power is supplied to the conductive spirals 2 of the convection block 1 and the heating element 7 of the closed heater module 6.

[0037] The design of the device allows for independent heating of the room at a fixed temperature of the closed heater 6 to the desired temperature as follows. Outside air, passing through the opening 23 in the base of the device 3 and then through the longitudinal openings 11 on the upper platform of the base of the device 3, enters the convection block 1, where it is heated by heated conductive spirals 2 and, already hot, through the grill of the heater cover 5, formed by the ribs 19 and 21 of the device, enters the steam room.

[0038] The air heating temperature in the convection block 1 can reach a temperature of +200° C. As soon as the air temperature in the room heats up to the required temperature in the steam room, which, as a rule, is no more than 110° C, the room temperature sensor 25 sends a signal to the control unit 24 and the heating of the conductive spirals 2 of the convection block 1 is switched off.

[0039] To obtain finely dispersed steam, water is fed into the bowl of the heater 16, water through the upper openings in the outer part of the branch pipe 17 of the bowl of the heater 16 enters the water distributor 22, through the openings of which it enters the heat-accumulating material directly into the center of the module of the closed heater 6 of the device.

[0040] Due to the air gap between the cylinder of the convection block 1 and the module of the closed heater 6, which is at least 25 mm, the tight closure of the gap from above by the flat rim 9 provides a “thermos” effect, which allows maintaining the temperature regime set in the closed heater and ensuring the production of high-quality fine-dispersed steam in the steam room.

[0041] Water, falling on the heat-accumulating elements of the closed heater 6 heated to a high temperature, explodes with a characteristic pop. Due to the high temperature of heating of the heat-accumulating elements of the closed heater 6, water particles become increasingly smaller and so-called light, finely dispersed steam is formed. Finely dispersed steam, being under pressure inside the module of the closed heater 6, flies out at high speed through the longitudinal holes of the nozzle 18, located on the branch pipe 17.

[0042] The design of the device allows for a stable high-temperature heating mode of the heat-accumulating elements of the closed heater while simultaneously maintaining the required air temperature in the steam room by the convection unit of the device, which in turn allows for the best steam generation mode. The quality of the steam produced in the closed heater module allows a person to breathe freely and easily in the steam room, independent maintenance of the temperature mode for heating the room and creating steam does not allow for the creation of clouds of water-saturated steam in the steam room itself. The design of the device is easy to disassemble, simple to maintain and can be adapted to the size of the room by increasing the number of heating coils of the convection unit.

[0043] The claimed invention meets the criterion of industrial applicability, since it can be manufactured using known technical means.

[0044] Price of Airport RU 2792382 C1, 2023г.

[0045] https: / / helo-its.ru / content / helo-round.

[0046] https: / / helo-its.ru / content / comb.

Claims

An electric stove comprising a housing, inside which a convection unit, conductive spirals and a closed heater module with heat-accumulating elements, a heating element and a temperature sensor are placed, a heater cover with a branch pipe, on the outer surface of the branch pipe a row of slots with a nozzle above them is made, characterized in that the conductive spirals are wound, one after another, around the cylinder of the convection unit, the closed heater module is located inside the convection unit with an air gap of at least 25 mm, the gap between them is closed at the top, the heater cover is made in the form of a cone-shaped funnel, on the outside of the funnel, below the upper horizontal platform of the heater cover, two ribs are welded in a circle, at some distance from each other, the heater cover branch pipe protrudes outward and has uniformly distributed holes along its outer circumference, the branch pipe enters the closed heater and has a water distributor at the bottom,in the form of a cone tapering downwards with uniformly distributed holes on it, the convection unit with a closed heater module is attached to the body of the base of the device, an opening is made in the lower part of the base of the device, on the upper surface of the base of the device, along the perimeter, longitudinal cutouts are located in several rows, at the bottom, on the base of the convection unit, an electronic control unit is fixed, the control panel is fixed in the opening on the side wall of the base, the device is closed with a casing in the form of a cylinder made of heat-insulating mixture, fixed in a circular groove of the base of the device, screw legs are located along the perimeter of the base of the device, at least 20 mm high. An electric oven according to claim 1, characterized in that the conductive spirals are held around the cylinder of the convection block using comb insulators. An electric oven according to item 1, characterized in that a decorative pattern is applied to the casing of the device.

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