RU140549U1 - ENERGY SAVING ELECTRIC HOB - Google Patents

Abstract

The utility model relates to heating devices. An electric energy-saving burner comprises a working surface, a heating element and a heat insulator, the burner further comprising a substrate, the heating element is made on a heat insulator using a conductive carbon-containing resistive paste, on top of which a dielectric paste is applied, and contact pads are made at the ends of the heating element using a conductive contact paste, and the heat insulator is made of ceramic fiber and is on the substrate. The working surface of the burner can be made of steel sheet with a thickness of not more than 10 mm. The hob substrate may be made of steel or ceramic and has a thickness of 10-12 mm. The technical result is a reduction in energy consumption while ensuring uniform heat dissipation, increasing the speed of heating the burner to operating temperature, as well as increasing the safety of work.

Description

The technical field to which the utility model relates.

The utility model relates to electrothermia, in particular to heating devices used in catering, in the food industry and in everyday life.

State of the art

The prior art is known for an electric burner for heating devices (USSR author's certificate for invention No. 1136328, class MPK Н05В 3/68, publ. 01/23/1985), containing an upper base with a smooth working surface, a lower base plate with channels in which tubular electric heaters.

A disadvantage of the known burner is the presence of a gap between the electric heaters and the base, which creates additional thermal resistance during heat transfer to the working surface.

Known electric burner (RF patent for the invention No. 23039556, class IPC Н05В 3/68, publ. 10/27/2007), containing a cast-iron stove, an inner lid installed on it with a layer of thermal insulation laid on it, an outer lid placed between the stove and the inner lid is a tubular electric heaters and a filling element for heat dissipation, made in the form of a cast-iron shot with a diameter of preferably not more than 2 mm

A disadvantage of the known electric burner is the long heating of the burner to operating temperature, due to the significant thermal inertia of the burner associated with its large mass.

Known electric burner (RF patent for utility model No. 66874, class IPC Н05В 3/68, publ. 09/27/2007) containing an upper base and a support cover with the formation of a space between them. Tubular electric heaters are installed in close contact with the inner surface of the upper base using fasteners, including a channel. Means of fastening a tubular electric heater are made in the form of a mounting plate with a hole and a wedge placed in the hole of the mounting plate with the possibility of a preloaded channel. The base cover is also secured with another wedge installed in another hole in the mounting plate with the possibility of pre-tensioned base plate. The space formed by the upper base and the support cover is filled with cast iron shot.

The disadvantage of this burner is the design complexity and its relatively low reliability due to the presence of fasteners.

Known electric burner (RF patent for the invention No. 2056701, class IPC Н05В 3/68, F24C 7/08, publ. 03/20/1996) containing a floor with an electric heater placed under it, and the floor is made in the form of a shell, inside of which there is a corrugated Ribbon element set by rib.

A disadvantage of the known invention is the lack of uniformity of heat dissipation, the formation of zones with different heating temperatures.

Known electric stove burner (RF patent for the invention No. 1268891, IPC F24C 7/00, F24C 7/04, publ. 11/07/1986), containing a heating chamber with a channel for circulating heated air, a heater, a support for the heat receiver, a fan, and also a damper . The support is made perforated in the form of a truncated cone, facing up and installed in the heating chamber with a gap relative to its side wall. In this case, the heater is located in the lower part of the support.

A disadvantage of the known invention is the relatively high power consumption of the known hotplates.

Known electric burner (RF patent for utility model No. 6295, IPC Н05В 3/68, publ. March 16, 1998), containing a base with a continuous working surface made of composite material, as well as an electric heater, a heat insulator and a casing installed under it, between a base made of ceramic with high thermal conductivity is installed with a base and an electric heater without a gap.

A disadvantage of the known burner is not sufficiently fast heating the burner to operating temperature.

Known electric heater (RF patent for the invention No. 2117219, class IPC F24C 7/00, publ. 08/10/1998) containing a heat insulating body, an infrared heating element, ceramic glass made in the form of a heating element, and a heat insulating body of the heating element is made with flanging the edges and mounted on the protrusions of the body of the electric stove.

A disadvantage of the known invention is the insufficiently convenient design of the heating element and, as a consequence, the high energy consumption of the electric heater.

Known electric burner (RF patent for utility model No. 62215, class IPC F24C 15/00, Н05В 3/68, publ. 09/27/2007), which contains a cast metal body with streams with a continuous working surface, an electric heater located in the grooves housing, heat insulator, and the electric heater consists of at least two heating elements, and the heat insulator is made flat and is rigidly fixed by the cover.

A disadvantage of the known model is the long heating of the burner to operating temperature and relatively high power consumption.

The closest in technical essence and the achieved positive effect adopted by the authors for the prototype is an energy-saving electric burner (http://Spooo.ru, Energy-saving technology "Econic", Electric flat heaters econic - an alternative to TEN [on-line], found from the Internet: <URL: http: //spooo.ru/post/article/36817. Published on 12/28/2012 in accordance with the information of the website http://web.archive.org,) including a work surface made of steel, a heating element made on conductive carbon insulator holding a resistive paste, which is applied from above dielectric paste, wherein the ends of the heating element via a conductive paste made of the contact pads, the heat insulator formed on the substrate, insulating the heating element, wherein the substrate is made of steel or ceramic.

A disadvantage of the known burner is the relatively high inertia of heating the burner to operating temperature, and as a result, a fairly high energy consumption.

Utility Model Disclosure

The objective of the utility model is to create a reliable, environmentally friendly and economical design of the burner, which has quick heating and safe working conditions for staff.

The technical result is a reduction in energy consumption while ensuring uniform heat dissipation, increasing the speed of heating the burner to operating temperature, as well as increasing the safety of work.

The specified technical result is achieved by the fact that the electric energy-saving burner contains a working surface, a heating element and a heat insulator, the burner additionally containing a substrate, the heating element is made on the heat insulator using a conductive carbon-containing resistive paste, on top of which a dielectric paste is applied, and at the ends of the heating element with conductive contact paste, contact pads are made, and the heat insulator is made of silicon-ceramic and one fiber located on the substrate, the thickness of the heat transfer layer of the working surface of the material is not more than 10 mm and the burner support is made of steel or ceramics and has a thickness of 10-12 mm.

Brief Description of the Drawings

Figure 1 shows a diagram of an energy-saving electric burner (top view).

Figure 2 shows a diagram of heat transfer from the heater to the environment.

Utility Model Implementation

The electric burner contains a working surface 1, a heating element 2 with contact pads 5 at the ends, a dielectric layer 3 and a substrate 4.

The working surface 1 is a protective layer of an electric burner, it can be made of steel, the layer thickness is usually up to 10 mm. When the thickness of the heat transfer layer of the material of the working surface 1 is more than 10 mm, the inertia of the electric burner is significantly increased, that is, the time to reach the operating mode is significantly increased.

The heating element 2 is made on the dielectric layer 3 using a conductive carbon-containing resistive paste. Such a material has a sufficiently high strength, thermal conductivity and fire resistance. A dielectric paste is applied on top of the conductive resistive paste.

At the ends of the heating element 2 using conductive contact paste made contact pads 5.

The dielectric layer 3 is located on the substrate 4 and is a heat insulator made of silicon-ceramic fiber. The use of this material allows you to protect a person from electric shock. Silicon-ceramic fiber has a heat-reflecting property and has a low heat transfer coefficient (carbon black coefficient is 0.77-0.81), which prevents the transfer of heat to the outside and protects the room and maintenance personnel from harmful thermal radiation (see figure 2). The dielectric layer 3 is also designed to seal the heating elements from oxygen, it can withstand temperatures up to 800 ° C, has mechanical strength sufficient for use in such devices, as well as high thermal conductivity. The layer is uniform over the entire surface.

The substrate 4 may be made of steel or ceramic. The shape of the substrate 4 may be round or rectangular. The thickness of the substrate 4, as a rule, is 10-12 mm The optimal thickness of the substrate is determined empirically: when heated under the influence of high temperature, with a thickness of the substrate less than 10 mm, an unacceptable deformation (warping) of the substrate occurs. If the thickness of the substrate exceeds 12 mm, then the inertia increases significantly, the substrate takes on a portion of the thermal energy, and accordingly, both the time to reach the operating mode and the energy efficiency of the burner are reduced.

The device operates as follows.

Current is supplied to the contact pads 5 of the heating element 2, heating of the heating (resistive) element 2 occurs and heat is distributed, which is then transferred to the working surface 1 of the burner. Thermal energy is released in the form of infrared radiation of a given range.

The protective layer of the working surface 1 thus evenly distributes the temperature on the surface. As a result, the efficiency of the heating element 2 increases and, as a result, energy is saved.

The heating elements used for various purposes in the technology emit thermal energy with high intensity and a shift of the radiation peak to the region of shorter waves. A natural filter for ensuring the emission of infrared waves in the optimal range (5-15 microns) is a silicon-ceramic fiber, which in this device serves as a case of the heating element 2.

All materials that make up the energy-saving burner are environmentally friendly, and the calculated temperature and electrical conditions do not allow to obtain effects harmful to humans.

An energy-saving burner can work without external regulation, since resistive pastes have the so-called posistor effect (high positive temperature coefficient of resistance). With increasing temperature, the electrical resistance of the heating element increases, which limits the current and, therefore, power. On the other hand, with intensive heat removal, the temperature drops, and with it the resistance of the heating element, which leads to an increase in power. The self-regulating property protects the burner from overheating and insufficient heating, ensuring the stability of temperature parameters during operation. Using the appropriate value of the resistive paste, you can pre-set the required temperature mode of operation of the heating element.

Direct heat transfer from the heating element formed by film technologies to the working surface causes an extremely low thermal inertia of the structure, which ensures a quick exit of the burner to the operating mode.

The technical parameters of the burner (supply voltage, power, operating temperature) can be changed over a wide range without changing the design of the heating element, only by changing the value of the resistive paste. Moreover, the quality of the deposited resistive, dielectric and contact films is easily visually controlled at all stages of production, and in case of detection of defects, the heating element can be rejected and restored in advance.

Experimental studies of the claimed device showed that, in comparison with a device of a similar purpose, the proposed device has the best technical characteristics, namely:

- the time to maximum heating of the working surface (380-400 ° C) is reduced by 2 times;

- when the same thermal effect is achieved, the nominal power consumption is reduced by 30-40%, which provides significant energy savings;

- the temperature of the back wall (substrate) of the burner is reduced by 2-2.5 times.

The use of natural materials in combination with inexpensive technological methods in order to improve its quality indicators allows you to create an environmentally friendly and economical device for converting electricity into infrared radiation.

A comparative analysis of the claimed utility model showed that the set of essential features of the claimed device is not known from the prior art and therefore corresponds to the patentability condition “Novelty”.

The above information confirms the possibility of using the claimed device as a heating device, which can be used in catering, in the food industry and in everyday life, and therefore meets the patentability condition "Industrial Applicability".

Claims (1)

An energy-saving electric burner containing a working surface made of steel, a heating element made on a heat insulator using a conductive carbon-containing resistive paste, on top of which a dielectric paste is applied, contact pads are made at the ends of the heating element using a conductive contact paste, and the heat insulator is made on a substrate of steel or ceramic, characterized in that the heat insulator is made of silicon-ceramic fiber, and the thickness of the heat the feeding layer of the material of the working surface is not more than 10 mm, and the substrate of the electric burner has a thickness of 10-12 mm.

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