RU199517U1 - ELECTRIC HEATED BLANKET - Google Patents

Abstract

The utility model relates to electrical engineering, namely to mobile heating devices for individual use on a textile basis, designed to protect the user from adverse environmental influences at low temperatures. The technical result consists in increasing the efficiency of the product by reducing heat loss. An electrically heated blanket, which is a two-layer blanket with several independent radially arranged heating elements based on waterproof resistive wires made of metallized polymer threads, fixed in a wavy path that excludes straight sections on the outer side of the inner layer for direct contact with the heated surface, equipped with an intelligent control unit providing the ability to control the temperature with feedback through the use of a proportional-integral-differential controller (PID controller) and a temperature sensor, while power is supplied from the battery, from the vehicle's on-board network or a stationary AC network, and on three sides of the textile base there is a zipper to transform the blanket into a sleeping bag. Heating is controlled by an intelligent control unit that turns on / off the device and implements, using PID control, temperature control of the heating elements with an accuracy of 0.1 ° C. The control unit is equipped with an audible and visual alarm indication of overheating, on / off buttons, heating temperature control and an information display that shows the current and set heating temperatures. 1 ill.

Description

The utility model relates to electrical engineering, namely to mobile heating devices for individual use on a textile basis, designed to protect the user from adverse environmental influences at low temperatures.

Known electric heating textile product (patent RU No. 2222119 C2, IPC Н05В 3/34, D04B 21/02, published on 20.01.2004), containing a textile structure, a plurality of resistive electric heating elements located at a certain distance from each other, introduced into the said textile structure and extending, as a rule, between opposite edge portions of said textile structure, and conductive elements comprising a conductive thread or conductive yarn and applied at least partially in the form of a conductive paste, extending generally along said opposite edge portions of said textile structure and adapted to connect said plurality of resistive electric heating elements located at a certain distance from each other to a source of electrical energy. The heating textile is made up of at least two layers of textile material, preferably these layers of material have folded outer surfaces and smooth opposing inner surfaces with a heating circuit located between them. Either the heating circuit is included in a separate heating layer with which it is laminated, or otherwise secured between the outer layers of material. The disadvantages of electric heating textile products are a large number of switching connections, which significantly reduces the reliability of the product as a whole, lack of moisture protection, low efficiency of heat transfer to the user, because the heating elements are isolated from the heated surface by the outer ripped surface of the textile layer, and there is no possibility to control the operation of the product, including the choice of the heating temperature optimal for the user.

Known flexible electric heater with automatic temperature control to the user's body temperature (patent RU 131265 U1, IPC Н05В 3/34, published on 08/10/2013), containing a flexible electrically insulated heating conductor installed inside the blanket shell, connected through a power supply unit containing a temperature measurement unit, connected to a logical control unit for a gradual decrease in temperature, which is configured to regulate the supply of voltage by a power supply connected to a stationary network (input voltage 220 V AC). In the versions of the electric heater, the temperature measuring unit and the logical control unit for the gradual temperature decrease can be installed inside the power supply housing, and the temperature sensor of the temperature measuring unit is brought out into the area of the flexible electrically insulated heating conductor. The disadvantages of a flexible electric heater with automatic temperature control are low efficiency, because Due to the location of the heating elements inside the blanket shell, the efficiency of heat transfer decreases, the user cannot set an individual comfortable temperature, and there is no protection against overheating. the task of the control unit is a gradual decrease in the heating temperature only after reaching the threshold temperature value, and not maintaining it at a given level, the impossibility of operating the product from an autonomous power source.

The closest technical solution, chosen as a prototype, is an electric heating device (patent RU No. 2709481 C1, IPC Н05В 3/36, published on 12/18/2019), containing a resistive heating element fixedly placed between two layers of a fabric base, while said resistive the heating element is located between the layers of the fabric base in the form of two symmetrically located relative to the longitudinal axis of meanders and is made in the form of one insulated or two separately connected insulated wires, and the ends of the resistive heating element are connected to the power controller, which is connected to a flexible USB cable of the electrical power connector, which in turn, it is brought out of the electric heating device to receive power. When the USB connector of the electric power supply is connected to an electrical computing device, the inventive device is made to enable the user to control the heating by means of the control software installed on the said computing device.

The essential features of the prototype that coincide with the features of the claimed utility model are:

- performed function - personal active heating of the user;

- textile woven base for fastening flexible heating elements;

- electric heating elements based on resistive wires;

- the ability to power from an autonomous source.

The disadvantages of the electric heating device described in the patent are:

- decrease in the efficiency of the heating wire due to its location between two layers of the fabric base, isolating the heating elements from the heating object (user);

- insufficient flexibility in the transverse direction, which reduces the convenience and efficiency of using the product due to the impossibility of repeating the contours of the user's body and a sufficiently tight fit of the heating elements to the heated surface;

- low reliability of the product due to the use of only one heating element (no more than two in different versions);

- no on / off button;

- lack of an information display to control the heating temperature;

- heating control is possible only when the product is connected to an electronic computing device, which significantly reduces the usability and mobility of the product.

The objective of the proposed utility model is to create an effective reliable safe mobile electric heating device with an individual setting of the heating temperature, which provides thermal comfort for the user under low ambient temperatures and ease of use both with low activity of the user (sitting, walking) and at rest.

The technical result is the creation of an electrically heated blanket, flexible in all directions, with a reliable heating system based on several independent elements with effective heat transfer and high fire safety, with a heating temperature set by the user with high accuracy in accordance with his preferences in various operating conditions, with power supply from an autonomous or stationary source and the ability to transform the blanket into a sleeping bag.

The technical result is achieved due to the fact that a two-layer blanket with several independent radially arranged heating elements based on waterproof resistive wires made of metallized polymer threads, fixed along a wave-like trajectory on the outer side of the inner layer for direct contact with the heated surface, is equipped with an intelligent control unit that provides control temperature with feedback due to the use of a proportional-integral-differential controller (PID controller) and a temperature sensor, while power is supplied from a battery placed in a special bag, or from the on-board network of a vehicle or a stationary AC network, and three the sides of the textile base are zipped to transform the blanket into a sleeping bag.

Placing the heating resistive wires on the outer surface of the inner woven layer along a wavy path that excludes straight sections provides high flexibility of the product in all directions and allows you to achieve the best contact of the heating elements directly from the heated surface, which significantly reduces heat loss and increases the efficiency of the product as a whole. The radial arrangement of the heating elements allows heating almost the entire surface of the blanket with one switching unit, which simplifies the manufacturing process of the product and increases its reliability. The use of several independent heating elements connected in parallel also significantly increases the reliability of the product.

Heating control is carried out using an intelligent control unit that turns on / off the device and realizes, using PID control, temperature control of the heating elements with an accuracy of 0.1 ° C. The control unit is equipped with an audible and visual alarm indication of overheating, on / off buttons, heating temperature control and an information display that shows the current and set heating temperatures.

Consequently, the claimed utility model meets the requirements of novelty.

The essence of the utility model is illustrated in FIG. 1 (general view of a blanket with electric heating).

The following positions are indicated in the figures:

1 - the fabric base of the blanket;

2 - flexible heating wire;

3 - temperature sensor;

4 - a zipper;

5 - control unit;

6 - control buttons;

7 - information display;

8 - red LED for light indication of heating;

9 - storage battery;

10 - bag;

11 - charger;

12 - power supply unit;

13 - car plug.

The utility model is an electrically heated blanket (see Fig. 1), consisting of a two-layer fabric base 1 with flexible heating wires 2 fixed to it, a temperature sensor 3 and a zipper 4 for transforming the blanket into a sleeping bag, control unit 5 with buttons for controlling the heating temperature 6, an information display 7 and a light indication of heating 8, a battery 9 placed in a bag 10, a charger 11, a power supply 12 for connecting to a stationary AC network and a plug 13 for connecting to an automobile on-board network.

The outer layer of the two-layer fabric base 1 is made of a dense synthetic fabric with moisture-resistant impregnation. The inner layer is made of soft synthetic fabric (for example, high-density fleece) with heating elements attached to it 2. The thermal insulation properties of the outer and inner layers of the fabric base 1 provide wind, moisture protection and passive heating of the user, and also increase the efficiency of active heating due to significant reducing heat loss. Along the three edges of the fabric base there is a zip fastener 4, which can be closed easily to transform the blanket into a sleeping bag. On the inside of the fabric base 1, there is a pocket for placing the control unit 5.

The heating element is a heating wire, the conductive cord of which is made of polymer filaments with resistive sputtering of metals (for example, lavsan filaments metallized with silver or copper) with polyolefin-based insulation. Such heating elements are safe and convenient to use due to the following properties of a heating wire based on metallized polymer filaments:

- fire safety;

- moisture resistance;

- manufacturability when switching;

- fast heating rate;

- small cross-sectional diameter;

- high flexibility;

- strength.

Several independent heating elements based on resistive wires 2 are located on the outer surface of the inner layer of fleece and, due to the preservation of the flexibility of the fabric base with heating elements due to the wave-like trajectory of the wire, excluding straight sections, are in direct contact with the heated surface, which reduces heat loss and increases efficiency of heat transfer, which significantly increases the efficiency of the product as a whole.

The control unit 5 allows the user to turn on / off the device using the control buttons 6 and set the required heating temperature, which is displayed on the information display 7. The information display 7 also displays the current temperature on the heating wires, which is determined using the sensor 8. During heating up to set temperature on the control unit red LED 8 is on. When the set temperature is reached, the heating switches off and the red LED turns off. At temperatures above plus 45 ° C, the visual (flashing of the information display) and sound alarm indications of overheating turn on.

Intelligent control with feedback, implemented by control unit 5 based on PID regulation using sensor 8, allows the user to select a comfortable temperature of the heating elements with high accuracy (up to 0.1 ° C), while maintaining uniform heating of the surface, since at any given heating temperature, all elements of flexible heaters are used.

For ease of use, the electric blanket can be powered by:

- from storage battery 9 (12.0 ÷ 16.8 V);

- from an external AC power supply with a voltage of 100 ÷ 220 V, which is converted into a voltage of 12 V by means of the power supply 12;

- from the vehicle network with a voltage of 12.0 ÷ 14.0 V by means of a car plug 13.

The battery is equipped with a balance board with a charge-discharge controller and short circuit protection. Lithium polymer batteries have a higher fire safety than lithium ion batteries, which improves overall product safety. The rechargeable battery is placed in a special compartment of the bag 10 with a switching connector brought out to the outside. To charge the storage battery, you need to connect the connector to the charger 11, powered by an alternating current 220 V.

The technical and economic efficiency of the proposed blanket with electric heating consists in a high useful heat transfer of heating elements due to direct contact with a heated surface of a complex shape, increasing the reliability of the product as a whole through the use of several independent heating elements and reducing the number of switching nodes to a minimum, while the possibility of high-precision control heating temperature allows providing thermal comfort to the user for a long time in various environmental conditions.

The utility model of an electrically heated blanket is industrially reproducible using standard sewing equipment, can be used as an independent product or in conjunction with other devices to provide personal thermal comfort for the user, has shown positive results during implementation and is characterized by compliance with the criterion "Industrial applicability" in light industry.

The proposed utility model can be used to maintain the user's thermal comfort for a long time in low ambient temperatures.

Claims (1)

An electrically heated blanket, consisting of an outer protective and an inner insulating woven layer, containing flexible electric heating elements connected to a power supply through a switching system, characterized in that several independent heating elements based on waterproof heating resistive wires made of metallized polymer threads are fixed on the outer side of the inner fabric layers and are located radially along wavy trajectories, and the heating temperature is controlled with an accuracy of 0.1 ° C by the user using an intelligent feedback control unit equipped with an information display, through the use of a proportional-integral-differential controller and a temperature sensor, while power is supplied from the battery, from the on-board network of a car or a stationary AC network, and on three sides of the textile base there is a zipper for transformation and blankets in a sleeping bag.

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