Electric heater for tumble dryers
a technology for electric heaters and tumble dryers, applied in the field of electric heaters, can solve the problems of large heaters, irritating noise during operation, vibration in the wires, etc., and achieve the effects of reducing vibrations transmitted, reducing the tendency to dust deposition, and preventing short circuits
Inactive Publication Date: 2010-04-01
I R C A S P A IND RESISTENZE CORAZZATE E AFFINI
View PDF28 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention is an electric heater for tumble dryers that solves the problems of large size and high noise levels. The heater has a compact structure with a resistive member that is supported by a multilayer structure made of insulating material. The resistive member has a flattened wire section with zigzags, arranged on a polygonal support structure made of three layers of insulating material. The support structure is designed to reduce vibrations and noise, and to prevent dust deposition and short circuits. The heater can be adjusted for different requirements of the apparatus, and there are various variants that can be used for different sizes of apparatuses. The technical effects of the invention are a smaller size, lower noise levels, and improved safety.
Problems solved by technology
While such electric heaters with coil-shaped wire are commonly used in the tumble dryer devices, they have some disadvantages.
A first disadvantage is that large heaters are needed in order to provide a sufficient heating power, e.g. higher than 5 kW.
A second disadvantage is that the air flow passing through the coil-shaped wires may cause vibrations in the wires, and therefore an irritating noise during operation.
A further disadvantage is due to the coil-shaped heating wires tending to become curved and capture dust, and their breakage may cause short circuits.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025]With reference to the Figures, a first preferred embodiment of an electric heater is depicted, globally indicated by reference numeral 1, which may be especially used in tumble dryer devices.
[0026]In this first embodiment, the heater object of the present invention comprises:
[0027]at least one resistive member, or simply resistor, 8 arranged on an outer side of the heater;
[0028]at least two resistive members 9 arranged on an inner side of the heater;
[0029]a support structure 6 for said resistive members 8 and 9 having a polygonal shape with at least one open side;
[0030]means 3 for connecting resistive members 8 and 9 to the mains for powering the resistors.
[0031]By passing forced air, e.g. at a rate higher than 5 m / s, through the resistors having a design temperature at a steady state of e.g. 400° C., the air rapidly heats thus allowing the laundry placed in the household appliance compartment to be dried.
[0032]Support structure 6 advantageously comprises a plurality of strips...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The electric heater for tumble dryer devices, object of the present invention, does not need the large size presently required to provide high powers. Furthermore, the particular shape of the resistive member reduces the vibrations transmitted to the apparatus and therefore the noise felt by the user. The particular shape of the heater determines a lower tendency to dust deposition on the heating member and a higher safety against short circuits in case of filament breakage.
Description
RELATED APPLICATION [0001]This application claims priority to Italian Patent Application No. RM2008A000516, in the name of I.R.C.A. S.p.A. Industria Resistenze Corazzate E Affini, filed on Sep. 30, 2008.FIELD OF THE INVENTION [0002]The present invention relates to an electric heater used in tumble dryer devices.STATE OF THE ART [0003]Various electric heaters used in tumble dryer devices are known.[0004]Some known electric heaters have at least a coil-shaped wire, for example helically wound, which is fitted on a support structure.[0005]While such electric heaters with coil-shaped wire are commonly used in the tumble dryer devices, they have some disadvantages.[0006]A first disadvantage is that large heaters are needed in order to provide a sufficient heating power, e.g. higher than 5 kW.[0007]A second disadvantage is that the air flow passing through the coil-shaped wires may cause vibrations in the wires, and therefore an irritating noise during operation.[0008]A further disadvanta...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): F23Q7/22
CPCD06F58/26
Inventor FATTOREL, CLAUDIOCELOT, MIRCO
Owner I R C A S P A IND RESISTENZE CORAZZATE E AFFINI