Electric stove

Abstract

The claimed electric heating device aims at heating and steam generation in a steam chamber or a sauna and provides stable high-temperature heating of a heat storage element. The electric stove has a housing provided with a cover, a housing that houses an electric heating coil in a convection heater, a rock module provided with a heat storage element, and a convection duct. The convection heater is disposed below an internal rock accommodation portion, a front wall of the convection heater has a convection opening, and a rear portion of the convection heater extends into an opening of a rear panel of a casing of the convection duct. A connection pipe is connected to an opening at the bottom of a pan of an external rock accommodation portion, and a structure composed of a profiled pipe having a series of openings is disposed inside the internal rock accommodation portion.

Description

Technical Field

[0001] The present device relates to the field of electrical technology, and particularly to the structure of an electric heating device for generating heat and steam, which can be used in bathroom and sauna facilities.

Background Art

[0002] Electric heating devices for bathrooms and saunas, "Premiera Rusa 220V with enclosed rock compartment" and "Premiera Rusa 380V with enclosed rock compartment" (Electric heating devices for bathrooms and saunas, Instruction Manual, URL: https: / / vvd.su / pdf / 05 / 03 / 02-vvd_brosh_pr_rusa_all_compressed.pdf, Electric stoves / stoves for bathrooms and saunas Premiera (Stoves Premiera) / Stove Premiera Rusa 220V (with enclosed rock compartment) URL:https: / / vvd.su / elektricheskie-pechi-dlya-bani / pechi-premera / premera-rusa-s-zakrytoj-kamenkoj#prettyPhoto) are known, each of which consists of tubular heating elements (THEs) and an outer enclosure. At the bottom of the electric heating device, a terminal block for connecting to the control panel is provided. Broken stones (gabbro-diorite, soapstone, or quartzite) are placed inside the electric heating device. The heat storage capacity of the electric heating device is obtained by providing enclosed and open rock compartments therein. To moisten the air in the steam chamber, there is a "cup" with a heat accumulator inside the enclosed rock compartment. Due to the small volume of the enclosed rock compartment, the heating of the heat storage element is fast, while at the same time, the cooling is also fast in the steam generation mode. It is necessary to obtain more steam from the rocks in the open rock compartment. When providing the required steam generation mode, a situation occurs where the temperature of the steam chamber itself decreases due to the temperature drop of the heat storage element during steam generation. The processes of steam generation and maintaining the temperature of the steam chamber exhibit different behaviors, which lead to a decrease in the quality of the obtained steam and a decrease in the temperature of the steam chamber, and ultimately also affect the quality of steam generation.

[0003] Also known is the device "Method for maintaining the air temperature of an electric stove for a Russian-style bathroom and an electric furnace of a steam room for a bathroom" (RU2738678, publication date December 15, 2020, bulletin number 35), which includes a heat-insulated furnace housing, an electric heater, a heat storage element, and a temperature sensor for the heat storage element. The heat-insulated housing of the furnace is made of a sealed base and side walls fixed thereon. The electric heater is arranged between the heat storage elements in the heating housing of the furnace, and each electric heater is made in the form of a heat-conductive flask to which a tubular electric heater is fixed. The heat storage element is made in the form of a steel rod. A ventilation duct for air supply is provided in the heat-insulated housing of the furnace, and this ventilation duct includes a fan with a check valve configured to supply air through the gaps between the heat storage elements. The fan with the check valve, the temperature sensor of the heat storage element, and the electric heater are made connectable to the control unit. By blowing air from the fan to the heat storage element and the electric heater, hot air is sent into the steam room, during which process the electric heater is cooled and the temperature of the heat storage element decreases. To obtain steam directly from the heat storage element, further heating is required, so more time is required to heat the steam room and the heat storage element. In the process of steam generation and maintaining the temperature of the steam room, they behave separately.

[0004] There is known a device called "Electric oven for a steam room in a bathroom" (RU2756610, issue date October 4, 2021, publication number 28), which includes a housing in which at least one heating element is installed in an inner housing provided with an outlet. An air layer is formed between the housing and the inner housing, and this air layer is connected by a fan outlet and the cavity of the inner housing and an air channel, where the heating element and the fan are connected to a control unit connected to at least one sensor for measuring the temperature of the steam room. The inner housing is provided with at least one vent and a temperature sensor connected to the control unit. A temperature sensor connected to the control unit is provided between the housing and the inner housing. An air channel connected to the fan outlet is provided with an outlet, and behind it there is an adjustment part made in the form of a damper, which is connected to the control unit. The steam generator is a container separated from the main device having a steam outlet, and is provided with an output pipeline for continuously supplying water evaporated by a tubular heating element (THE) arranged inside the steam generator. The water level is set by a float valve and is in another container with an unsealed cover, and is connected to the piping system via a connecting pipe. The air temperature in the steam room is adjusted by the fan and the damper, and the steam generator for obtaining steam is used only to maintain an optimal ratio of the temperature and humidity in the steam room, and cannot create finely dispersed steam that can only be obtained under temperature conditions of 500 °C or higher. The structure of the device has several parts with moving surfaces and friction surfaces and auxiliary equipment (floating valve, damper, fan), and these parts fail quickly and require repair and maintenance.

[0005] There is known a device called "Electric sauna heater with steam generator" (SE500509C2, US5054105A, DE4005793A1), which device comprises at least one electric resistor (on which the rock of the heater can be placed inside) for heating the sauna room, an evaporator in the form of an evaporation space filled with water, a steam heater (provided with at least one electric resistor for heating water to the state of steam), and a thermostat, the thermostat being arranged adjacent to the outer surface of the evaporation space and having a sensor responsive to a temperature rise from a predetermined temperature. A water supply container can be placed near the evaporator or water can be supplied directly from a pipe. The evaporator is further connected to a steam discharge pipe and a pipe extending up to a position near the top of the sauna heater. The drawback is the complex operation algorithm of the device, due to which the stability and continuity of the temperature and humidity conditions in the steam chamber cannot be obtained, and at the same time, due to the structure of the evaporator, finely dispersed steam cannot be obtained.

[0006] There is known a device "electric stove for bathroom" (RU2057998), which is considered a prototype and includes an electric heater furnace and a chamber (having a heat storage material) connected thereto. The housing is formed by a base, and the base includes a screen and a casing coaxially installed thereon. The walls of the screen and the casing form through channels. These through channels open at the bottom, the top is covered with a cover, and in the center thereof, a heat-resistant mesh having air and steam permeability and flexibility is fixed, and a Venetian blind window is arranged in the cavity of the furnace provided on the side. In the cavity of the furnace, there is an E-shaped vertical cup made of a heat-conductive material, and an electric heater placed on an insulator is provided inside thereof. The screen prevents heat diffusion and collects the heat flow entering the heat storage chamber by the convective flow. The charging chamber of the device is made as a flexible mesh of heat-resistant material, the airtight cup is made of heat-resistant steel with a thickness of 3 mm or more, and a part of the cup is protected by a Venetian blind. In this device, water can be sprayed only on the body part of the cup, and its temperature is 450 °C. Infrared rays are transmitted to the body of the cup and spread from there through the volume of the furnace. In the internal cavity of the furnace, a convective air flow is generated, and this air flow passes through the channel between the base housing and the screen from the bottom and fills the furnace. The infrared radiation partially heats the screen, reflects from there and returns to the center of the furnace, and is added to other heat flows at the same time. The temperature of the upward air flow at the center of the furnace reaches the maximum value. The high-temperature air flow concentrated in the central part hits an obstacle (chamber) during rising, the air flow bypasses to its side, enters the chamber through the channel between the heat storage materials, and uniformly heats the heat storage materials to a high temperature. The air that has partially released heat warms the steam chamber while going out. The air flow that has not been heated much passing through the furnace rises near the wall of the screen and releases heat to the channel between the screen and the casing partially heated. As a result, self-regulating convection appears in the channel, warming the steam chamber of the bathroom. When the temperature of the steam chamber reaches 125 °C, the electric stove automatically turns off and remains off until the temperature drops below 110 °C, turns on again, and this cycle is repeated. When the heat storage material reaches the required temperature (380 °C), water is partially supplied to obtain steam.To obtain dry steam, the steam generation process is carried out in a short time. When the required temperature in the room is reached, there may not be enough time for the heat storage material to be heated to the temperature required to obtain dry steam. After water is supplied to the heat storage material to obtain steam, it is necessary to restore the temperature required for steam generation, which leads to an excessive increase in the air temperature in the room. The processes of steam generation and maintaining the temperature of the steam chamber exhibit different behaviors. Strong infrared rays can cause burns. The device is 12m. 3 It is provided to effectively obtain dry steam in the steam chamber of. Beyond the range, wet steam may be generated, the output of the heater may increase too much, the risk level increases, and the usage effect decreases.

Summary of the Invention

[0007] The problem to be solved by this technical solution is to improve the consumer characteristics of the device by providing high-temperature heating of the heat storage element in the internal rock accommodation part while maintaining the required constant air temperature in the steam chamber by means of a convection device in order to obtain the best steam generation conditions.

[0008] This result is obtained by the device described in the claims. This device has a frame structure with a metal housing in the shape of a parallelepiped regularly oriented vertically. Inside its cover, there is incorporated a bowl of an external decorative rock housing part with a heat storage element of natural rock, and a convection grating for supplying hot air into the room. The bowl of the external rock housing part is made as a container with a wall arranged obliquely with respect to the center of the bottom of the bowl, and at the lower part, a connection pipe with a circular cross-section is sealed and attached to a hole at the bottom of the bowl. Inside the frame structure with the metal housing, an internal rock housing part module is installed, and the internal rock housing part module includes a heat storage element for creating finely dispersed steam and a convection heater located below it. The casing of a convection duct with a rectangular cross-section is adjacent to the rear wall of the housing, and its upper part extends under the convection grating of the cover of the device. On the outside, a decorative surface as an additional protection member against infrared radiation of the device, such as a colored heat-resistant glass panel or a decorative panel of stone or brick, for example, is incorporated.

[0009] As the heat storage element for the open and closed type rock housing parts, for example, natural split stones or natural crushed stones can be used. In addition to natural rocks, artificial heat storage elements can also be used in the internal rock housing part. For example, metal ingots of various geometric shapes that meet requirements such as resistance to temperature drop, heat capacity, and safety for health.

[0010] The internal rock containment module is a parallelepiped-shaped metal housing regularly oriented vertically, having a double wall, a bottom, and a cover. Between them, a heat insulator with a thickness of 25 mm or more, such as ceramic fiber, is inserted. Due to its physicochemical properties, it provides the lightweight, strength, and wear resistance of such a structure under the high-temperature operating conditions of the device, protects the external space from infrared radiation, and does not consume heat for heating the steam chamber itself. The cover of the internal rock containment is adjacent to the wall of the rock containment precisely and has an opening. A branch pipe from the outer rock containment passes through the opening, and below it, for example, a structure of a profiled pipe with a square cross-section is installed. A series of small openings or slits are provided at the lower part of the horizontally arranged pipe of the structure. The structure of the profiled pipe can be further placed on, for example, a bracket fixed inside the wall of the rock containment. At least two heating elements with a total power of 3 kW or more are installed at the bottom of the rock containment, and a thermocouple sensor for controlling the temperature inside the internal rock containment is also installed.

[0011] To release finely dispersed steam, a series of small horizontally extending oval slits are provided in the cover of the internal rock containment, and there is a jet outlet above it. When water meets the heat storage element of the internal rock containment from there, the steam passing through the convection duct casing exits through the convection grating of the device into the steam chamber. The injection port faces the convection duct. Through the connection pipe of the bowl of the external rock containment, water enters the structure of the profiled pipe of the internal rock containment and enters the heat storage element of the internal rock containment through the opening of the profiled pipe.

[0012] The internal rock containment can hold a heat storage element weighing 25 - 30 kg, and the heat storage element can be heated up to 500°C without losing the indoor heat by the heating element arranged within the rock containment. Since the housing and the cover of the rock containment are closely connected, excessive pressure is generated within the rock containment, which further heats the steam and makes it easier to generate finely dispersed steam. When the temperature of the rock is above 500°C, water instantly turns into so-called "light" steam that is finely dispersed, making it easier for people to breathe freely in the steam chamber and preventing the direct formation of saturated water vapor clouds in the steam chamber. If the temperature within the internal rock containment is not maintained high, when saturated steam is generated, part of the water remains in the form of droplets. Such steam has conventionally been called "wet" or "heavy", has a large amount of condensed water, and increases the heat sensation in the steam chamber. In such a steam chamber, one doesn't even have time to sweat before getting wet, the breathing is interrupted, and one feels heavy. This effect occurs when the heat storage element in the internal rock containment is not heated sufficiently to reach a temperature of 500°C or higher required for steam generation.

[0013] The convection heater is a rectangular parallelepiped-shaped structure with two double walls arranged opposite each other, with a heat insulator (e.g., ceramic fiber with a thickness of 25 mm or more) inserted between them, and an electrical insulator (e.g., mica plate with a thickness of 0.5 mm or more) inserted inside the walls. On the front wall of the convection heater, a horizontal grating-shaped convection opening is provided for taking in air from the steam chamber into the convection device for heating. The rear surface on the opposite side of the convection heater is open and fits snugly into the convection duct casing, and the air heated to the required temperature enters the steam chamber through the convection grating. On the opposite side of the convection duct, a protective screen, for example, in the form of a metal sheet added, is installed on the opposite side of the convection device for inner protection from infrared radiation. Inside the convection heater, several heating coils of 3 kW or more are installed according to the required power of the device and the size of the room to be heated, and are connected to the electronic control unit through a terminal block fixed outside the frame structure. The heating element and the thermocouple temperature sensor in the internal rock containment are also connected to the terminal block.

[0014] The control unit is a circuit board on which an information output device and a temperature control relay unit are arranged. Data from the temperature sensor installed in the internal rock storage unit and the air sensor installed in the steam chamber are sent to the control unit, displayed on the display, and the air temperature is adjusted by the relay as needed.

[0015] Due to the structure of this device, heating of the steam chamber can be performed without reducing the steam generation temperature in the internal rock storage unit. Conversely, even if the necessary steam generation temperature for the internal rock storage unit is provided, the temperature of the steam chamber will not decrease. This is because, by the convection device of this device, while maintaining a constant required air temperature in the steam chamber, independent high-temperature heating of the heat storage element in the internal rock storage unit is performed to obtain finely dispersed steam.

[0016] This technical achievement has created a device structure that provides stable high-temperature conditions for heating the heat storage element in the internal rock storage unit, and at the same time keeps the required air temperature in the steam chamber constant by the convection device of the device, enabling the best steam generation conditions.

Brief Description of the Drawings

[0017] The essence of the present invention is illustrated by the following drawings.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying out the Invention

[0018] This device operates as follows. This device is installed in the steam chamber and is connected to the electronic control unit 11 via a terminal block 12 attached to the lower side portion of the frame structure 1. The control unit 11 can select the automatic operation mode of the device, control and adjust the temperature in the internal rock storage section module 7 by the thermocouple sensor 21, control and adjust the temperature in the steam chamber by the air sensor 13 connected to the control unit 11, and limit the operation time of the device.

[0019] The bowl of the internal rock storage section module 7 and the external rock storage section 4 are filled with a heat storage material and are tightly closed with a cover 16. In order to firmly attach the cover 16 to the internal rock storage section module 7, for example, a heat-resistant cord laid along the inner diameter of the cover can be additionally provided.

[0020] When power is supplied from the control unit by closing the coil of the conductive material of the heating element 20 in the internal rock storage section 7 at the control power contact of the relay, these are heated to a temperature of 700 °C or higher. At this time, the heating element heats the wall of the casing through the electrical insulating material laid in the casing of the heating element 20. The heat storage material in the internal rock storage section is heated to a temperature of 500 °C or higher. The temperature of the heat storage element can be controlled by the thermocouple 21 disposed inside the internal rock storage section module 7.

[0021] Independent heating indoors is carried out as follows. When power is supplied from the control unit by closing the coils of the conductive material of the heating element 25 of the convection heater 8 with the control power contacts of the relay, they are heated to a temperature of 250 °C or higher. The outside air that enters through the convection openings of the grating 26 in the convection heater 8 is heated by passing through the heated coils of the heating element 25, and after reaching a high temperature, it flows into the steam chamber through the openings of the convection duct 9 and the convection grating 5. The temperature of the air heated by the convection heater may reach a maximum of 200 °C. When the temperature of the room reaches the value required for the steam chamber (generally 110 °C or less), the sensor 13 stops heating the convection unit.

[0022] To obtain finely dispersed steam, water is supplied to the bowl of the external rock housing 4, passes through the steam pipe 10 from the opening at the bottom of the bowl, enters the structure of the profiled pipe, and is evenly distributed to the heat storage material in the internal rock housing 7 of the device from the opening at the lower part of the horizontally arranged pipe of the structure 17. Since the cover 16 is tightly connected to the housing of the internal rock housing 7, excessive pressure is generated in the rock housing, which promotes further heating of the steam and the generation of finely dispersed steam. When water touches the heat storage element of the internal rock housing 7 (heated to a high temperature and surrounded by the heated inner wall of the internal rock housing), it ruptures with a characteristic popping sound. The high-temperature steam containing water droplets is sucked upward, but in the closed space, when it touches the high-temperature surface of the inner wall of the internal rock housing, it is further heated from there and is also heated from the air between the heat storage elements while repeating the "micropop" sound. Due to the high temperature of the heated heat storage elements in the internal rock housing 7, the water particles become smaller and smaller, generating so-called "light" finely dispersed steam.

[0023] The finely dispersed steam under pressure in the internal rock housing 7 shoots out at high speed through the nozzle 19 in the cover 16 of the internal rock housing 7, and while generating a unique sound like a snowstorm, it heads towards the steam chamber through the openings of the convection duct 9 and the convection grating 5 of the device. The opening of the nozzle faces the convection duct.

[0024] Due to the structure of this device, stable high-temperature conditions can be provided for heating the heat storage elements in the internal rock storage part. At the same time, the required air temperature in the steam chamber can be kept constant by the convection device of this device, so the best steam generation conditions can be provided. The quality of the steam obtained in the internal rock storage part enables people to breathe freely in the steam chamber. Maintaining the temperature conditions for heating the steam chamber and the temperature conditions for steam generation independently prevents the formation of clouds of saturated water vapor directly in the steam chamber.

Claims

1. An electric stove, comprising a housing with a cover, the housing accommodating, inside the cover, an electric heating coil in a convection heater having a heat insulation wall and a rock accommodating part module with a heat storage element, and having a convection duct, wherein the housing of the convection duct is fixed to the rear wall of the housing of the stove, the convection heater in the housing is located below the internal rock accommodating part, an electrical insulating material is attached to the inner side of the wall of the convection heater, a convection opening is provided in the front wall of the convection heater, the rear part of the convection heater extends into an opening in the back panel of the casing of the convection duct, the cover of the housing of the stove is provided with a bowl of an external rock accommodating part and a convection grating, and the opening of the casing of the convection duct is adjacent to the convection grating, a connecting pipe is provided in an opening at the bottom of the bowl of the external rock accommodating part, the covered housing of the internal rock accommodating part is protected by a heat insulating material, the internal rock accommodating part is provided with a structure of a profiled pipe having a series of openings, an insulated heating element, and a temperature sensor, the cover of the internal rock accommodating part is provided with a series of slits covered with injection ports, and the injection ports are directed towards the casing of the convection duct, an electric stove, wherein the upper end of the back panel of the casing of the convection duct is located at the same height as the cover of the internal rock accommodating part.

2. The electric stove according to claim 1, wherein the thickness of the heat insulating material of the convection heater and the heat insulating material of the internal rock accommodating part is 25 mm or more.

3. The electric stove according to claim 1, wherein the thickness of the electrical insulating material of the convection heater is 0.5 mm or more.

4. The electric stove according to claim 1, wherein the total power of the heating coil of the convection heater is at least 3 kW.

5. The electric stove according to claim 1, wherein an air sensor is connected to an electronic control unit.

6. The electric stove according to claim 1, The structure of the profile processing pipe of the internal rock accommodating part is placed on a bracket fixed inside the wall of the internal rock accommodating part module, an electric stove.

7. In the electric stove according to claim 1, The total power of the heating element of the internal rock accommodating part is at least 3 kW, an electric stove.

8. In the electric stove according to claim 1, Inside the rock accommodating part, the heating element is arranged in a metal casing having reinforcing ribs at corners, and the casing is filled with an electrical insulating filler, an electric stove.

9. In the electric stove according to claim 1, The internal rock accommodating part module and the convection heater are connected to the electronic control unit, an electric stove.

10. In the electric stove according to claim 1, In the casing of the convection duct, a protective screen is installed facing the convection heater, an electric stove.

11. In the electric stove according to claim 1, An insulating material is inserted between the back plate of the convection duct casing and the housing, an electric stove.

Images