Electric flexible heater

 

(57) Abstract:

Usage: for plate heaters. The inventive heater is made of a multilayer consisting of insulating layers alternating with pairs of connected layers of heat-resistant material, between which are resistive heating elements, which improves performance, durability, simplifies the technology. 2 C.p. f-crystals, 2 Il.

The invention relates to heating devices with heating elements, in particular to heating devices with increased surface, mainly two-dimensional, such as plate heaters in which the heating elements are embedded in insulating material.

There are electric heaters (heaters) [1, 2] contains the basis of several layers of elastic material such as rubber or rubber-like mass, between which are sequentially stacked heating elements or out of the ordinary cable or from a flat conductive tape.

However, these heaters have several disadvantages, such as the device of the heating elements, providing for mandatory prisutstvie, as the heating elements is used in a normal conductor or conductive flat ribbon attached to the body of the heater is a special adhesive tape. In addition, the heating temperature analogues is not high enough, which leads to limitation of scope. As analogues of heating elements are arranged consecutively, for their heating requires high voltage, which reduces the electrical safety when working with them.

The closest technical solution is the device described in U.S. patent [3] where the design of the heating elements much easier. However, between the heating wire and flexible rubber outer shell there is a layer of thermal insulation fabrics, sprinkled to reduce reflective effect of aluminum powder.

The aim of the invention is to improve the performance of the heater, increasing its durability, ease of manufacturing technology and improve electrical safety.

Improved performance is achieved by using several layers of heat-resistant elastic material, for example, of heat-resistant resigned elements. Elastic Foundation provides full contact with the heated surface, that is, creates good conditions for conductive heating. Use for the base oil-resistant rubber, which is not destroyed by exposure to oil, allows the use of oil as a layer between the heater and the heated surface, which improves conductive heating. In addition, the use of special heat-resistant rubber helps increase the temperature and thereby to expand the scope of the heater.

The use of rubber as the outer shell of the heater eliminates electrical arcing and damage to the heater due to penetrating moisture. This increases durability and allows you to operate the heater in extreme conditions, such as outdoors, at subzero temperatures, rain and snow.

Improving electrical safety when working with the heater is connected, firstly, with complete electrical insulation of heating elements with several layers of rubber membrane, and, secondly, to the fact that the heating elements are parallel and heating requires less voltage than if they raspolagaet in manufacturing. The presence of a heat-resistant rubber leads to simplification of the device of the heating elements, as there is no need to protect the external elastic membrane from overheating.

The use of insulating layers, for example, of glass, alternating with pairs of connected layers of heat-resistant elastic material, between which is placed the heating elements, allows to reduce heat loss to the environment that leads to increased efficiency of the heater and the ability to achieve the desired heating temperature using a heater less power. In addition, the fabric layer can increase the mechanical strength of the heater.

The use of electric buses, with cross through the dividing grooves arranged in a checkerboard pattern with a step, multiple step reinforcement heating elements, allows for the preservation technology of manufacturing the heater to substantially expand the range of changes in electrical resistance heater and, accordingly, the variation ranges of electrical power, current and voltage of the heater.

The authors have not detected known technical R is

In Fig. 1 presents a General view of the heater with a folded edge of one of the layers of rubber cover, to show the General arrangement of the heating elements. Additionally, in Fig.1 presents a cross-section a-a, showing the mutual arrangement of the heat insulating layer and pairwise connected by layers of heat-resistant elastic material, between which is placed the heating elements. In Fig.2 presents different ways of wiring diagrams heating elements elastic heater.

Electric flexible heater (Fig.1) contains teploizolyatsii layer 1, are pairwise United 2 layers of heat-resistant elastic material, between which is placed parallel spaced heating elements 3 of the high-resistance material, the opposite ends of which are secured to the parallel electric tire 4 connected via cable 5 with terminal 6 for connection to a source of current. Along the perimeter of the heater are holes 7 for attachment to the heated object.

The heater can be equipped with electric buses (Fig.2) with cross through the dividing grooves 8 arranged in a checkerboard pattern with step of the way: first of all, the heater is attached to a heated object by means of fixing elements (Fig. not provided) through the holes 7. After connecting the heater to the power source through terminals 6 and an electric cable 5 heating elements 3 of the high-resistance material is starting to heat up as a result of passage through them of the electric current. Maximum temperature is determined by the type of elastic material, which is made from layers 2, for example, heat-resistant rubber is +250oS. Emitted from the heating elements 3 heat by heat transfer and convective exchange of heat of the heated object to the desired heating temperature.

In Fig.1 shows a heater designed for use in low voltage current source, since the heating elements 3 of the high-resistance material are parallel electrical connection. To improve performance, in particular, to increase the range of variation of electrical resistance, power, voltage and current used by heater made according to schemes a,b,C,d, shown in Fig.2.

To prove the possibility of using different power sources are the following calculation.

As the heating element will choose nichrome the m

The electrical resistance of one of the strands of the heating element length l of 200 mm:

< / BR>
where electrical resistivity (nichrome

=1,00510-6Mme at T= +20C, 1,005 10-6Mme at T +20oV).

d diameter of the thread,

l is the length of the thread.

Find the total electric resistance heater for various schemes wiring of the heating elements (Fig.2):

< / BR>
where

P number of parallel sections of the heating elements,

R is the resistance of a single thread,

L is the length of the heater,

h reinforcement step.

< / BR>
The calculations can be continued further. Current and heater power to the above circuits are respectively equal to:

scheme:

< / BR>
where I is current (amps),

U supply voltage (V),

P U I 220 0,22 48 W,

where P is the power of heater (W).

scheme b):

I 220/250 to 0.88 And R 220 0,88 194 W,

scheme):

I 220/110 2 A, P 220 2 440 W,

scheme g):

I 220/62,5 3,52 A, P 220 3,52 775 Watts.

Thus elastic electric heater, representing the subject of this invention is characterized by improved performance, increased durability, simple technologist is actiony heater, containing a multilayer structure of at least two layers of heat-resistant elastic material, between which is placed the heating elements, characterized in that the heater consists of alternating layers of heat-resistant elastic material, mainly thermo-oil-resistant rubber and layers of insulating material, which is tightly connected with one side of the heater is a layer of insulating material, and with another two layers of heat-resistant elastic material, hermetically covering placed parallel to each other heating elements, the opposite ends of which are mounted on parallel electrical tires.

2. The heater under item 1, characterized in that the electric bus with cross through the dividing grooves arranged in a checkerboard pattern with a step, multiple step heating elements.

3. The heater under item 1 or 2, characterized in that on the surface of the heater-side heat-resistant elastic material is coated with the layer of oil, water or other liquid coolant.

 

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