EP1351259A1 - Résistance - Google Patents

Résistance Download PDF

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Publication number
EP1351259A1
EP1351259A1 EP03002156A EP03002156A EP1351259A1 EP 1351259 A1 EP1351259 A1 EP 1351259A1 EP 03002156 A EP03002156 A EP 03002156A EP 03002156 A EP03002156 A EP 03002156A EP 1351259 A1 EP1351259 A1 EP 1351259A1
Authority
EP
European Patent Office
Prior art keywords
resistor
cylindrical
core
resistor according
resistive elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03002156A
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German (de)
English (en)
Inventor
Amerigo Barbieri
Sergio Caretti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP03002156A priority Critical patent/EP1351259A1/fr
Publication of EP1351259A1 publication Critical patent/EP1351259A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/14—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding
    • H01C3/16—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element being formed in two or more coils or loops continuously wound as a spiral, helical or toroidal winding including two or more distinct wound elements or two or more winding patterns

Definitions

  • the present invention relates to a resistor.
  • resistors are devices that originates a resistance to the electrical energy flow and are used to transform electrical energy into heat in order to disperse it through the Joule effect.
  • Known resistors are normally of two types and in particular wirewound resistors and strip resistors.
  • the latter have the advantage of allowing greater heat dissipation, thanks to the larger heat exchange surface which they are provided with. Therefore, with the same number of watts supplied, the strip resistor can work at lower temperatures than those at which a wirewound resistor works and consequently it has a longer useful life. Nonetheless, strip resistors have considerably higher production costs and considerably larger overall dimensions that do not allow easy positioning inside the instruments which they are destined to.
  • the object of the present invention is to solve the problems of prior art by providing a resistor that guarantees good heat dissipation and which is small in size and is thus extremely easy to position inside the device it is destined to.
  • Another object of the present invention is to provide a resistor which is simple and inexpensive to produce.
  • the present invention relates to a resistor provided with two or more cylindrical resistive elements, characterized in that the resistive elements are contacting each other in several zones and that at least one of cylindrical resistive elements winds around the remaining cylindrical resistive elements.
  • the heat exchanging surface of the resistive element is increased while obtaining, at the same time, a resistor with smaller overall dimensions compared with a strip resistor.
  • the present invention provides a first cylindrical resistive element arranged in a core on which one or more cylindrical resistive elements are spirally wound.
  • This embodiment permits to obtain optimum dispersion capacities with smaller resistors, making it possible to considerably save on production costs, since less material is required for their production.
  • the distance between two adjacent turns is within the range of 0.3 mm to 20 mm.
  • a decrease in the distance between turns causes an increase in the number of turns that wind around the cylindrical resistive element positioned in order to form the core of the resistor and in this manner the working heat exchanging surface increases.
  • the distance between two adjacent turns is preferably within the range 0.5 mm and 3 mm.
  • Figure 1 shows a possible embodiment of a resistor 1 according to the present invention wherein two cylindrical elements 2, 3, and in particular two wires with a circular section, in resistive material, are stranded around each other so that they are essentially in touch for their entire length.
  • both cylindrical elements 2, 3, have a helical course and constant distance between turns.
  • one cylindrical element 4 made of a resistive material is arranged to form a core, around which is spirally wound a further cylindrical element 5 made of a resistive material.
  • the cylindrical element 5 is spirally wound around the cylindrical element 4 which is arranged in a core so that the distance between the turns, or the pitch 17, is constant.
  • the cylindrical elements 4, 5 have a circular section and different diameters.
  • the cylindrical element 4 arranged in a core has a considerably larger diameter than the wound cylindrical element 5.
  • the two cylindrical elements 4, 5 could have the same diameter and/or different shaped section, for example the cylindrical element 4 arranged in a core could have a rectangular section and the wound cylindrical element 5 could have an elliptical section.
  • cylindrical elements with any section may be used, a circular section is particularly suitable for the wound cylindrical element 5.
  • the diameter of the cylindrical elements is generally included between 0.09 and 5.0 mm.
  • the number of cylindrical elements made of a resistive material and wound on the cylindrical element 4 arranged in a core could, as shown in figure 3, be greater than one in order to further increase the heat exchanging surface.
  • the distance between the turns, or pitch 17, if there is only one cylindrical element spirally wound around the core, or the distance 17 between two adjacent turns, if several parallel cylindrical elements are wound around the core, is varied according to the heat dissipation value to be obtained, measured in cm 2 /ohm.
  • the distance between two adjacent turns is generally within the range of 0.3 mm and 20 mm.
  • the distance 17 between two adjacent turns is within the range of 0.5 mm to 3 mm.
  • a 2500 Watt 220V alternate current resistance is required for an air conditioner nozzle having dimensions of 170 x 570 mm, crossed by an air flow provided at a mean velocity of 4 m/s.
  • the resistor In order to prevent problems concerning tightness of the air conditioner materials, the resistor must work at "obscure heat", correspondent to a wire temperature of about 200°C.
  • the same resistor can be assembled according to the present invention using a cylindrical resistive element acting as a core on which a second wire is wound.
  • the first cylindrical element that is the element 4 in figure 2
  • the resulting element 1 has the following characteristics:
  • the present invention allows considerably greater heat dissipation values, compared to those according with the prior art. It will be possible for the operating resistor, to work with lower superficial temperatures of the wire compared to the resistor according to prior art, this leading to the advantage of a longer useful life of the apparatus on which the resistor is fitted.
  • the following example II shows that, given two resistors 1 according to the invention and in particular according to the embodiment shown in figure 2, with a resistive element 4 arranged in a core and a wound resistive element 5, and in which the first resistor has a winding having a pitch between turns chosen in the range 0.5 - 3 mm and the second resistor having a winding with a pitch chosen in the range between 3 and 20 mm, the dissipation capacity of the sample chosen in the restricted range is greater than the dissipation capacity of the sample of resistor made with a distance between turns included in the range from 3 to 20 mm. Moreover, it will be noticed how the increased dissipation capacity occurring in the restricted range is not equal to the expected one, being evident from an experimental verification that this enhancement in the dissipation capacity is surprisingly greater than the one suggested by the expectations .
  • the resistive element arranged in a core that is the cylindrical element 4 in figure 2 has the following characteristics:
  • the wound cylindrical element 5 has the following characteristics:
  • the wound cylindrical resistive element 5 has the following characteristics:
  • the dissipation capacity of the sample characterized by a pitch between turns included in the range from 0.5 to 3 mm, is greater than the dissipation capacity of the sample characterized by a pitch in the range between 3 and 20 mm.
  • dissipation values are not those expected, but greater, and in particular in the case of the sample characterized by the narrow pitch between turns, that is the range 0.5 - 3 mm, increase in the dissipation is surprisingly 15% greater than the expected one.
  • the present invention exceeds real expectations from the range selection.
  • Figure 4 shows a resistor with the cylindrical element 6 arranged in a core having a rectangular section, and with a wound cylindrical element 7 having a cylindrical section.
  • This embodiment in practice is equivalent to a strip, but even if it has the same overall dimensions of a strip resistor its performance is considerably higher.
  • the cylindrical element 6 arranged in a core with a rectangular section costs slightly more than a cylindrical element with a circular section, the reduction in length and weight, with the same performance, justifies and compensates this increase in cost.
  • FIG. 5 shows the application of resistors according to the invention in heating devices particularly suitable for this application.
  • Said strip type heating devices are assembled with a pair of supporting plates 9 of insulating material, such as micanite, arranged parallel to each other and provided with a series of holes 12 of equal diameter.
  • each hole 12 in the upper plate corresponds to a hole in the lower plate and both hold in position and support a resistor 1 according to the invention, bent in a substantially spiral ellipsoidal shape.
  • spiral which is made with a resistor 1 according to the invention it may have saddle-shaped portions (not shown).
  • the saddle-shaped portions are merely portions of the spiral 8 appropriately bent around the plates, the course of which resembles, at these plates, the outline of a saddle or a sinusoidal curve.
  • any type of resistor according to the invention can be used, such as a resistor having a core element, that acts as a core for the winding, characterized by a rectangular section, such as the one shown in figure 4.
  • the cylindrical elements in resistive material utilized in the present invention are made of a known and normally used (for this purpose) material, such as constantan, Ni/Cr alloys and other metal alloys.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Details Of Resistors (AREA)
EP03002156A 2002-02-13 2003-02-03 Résistance Withdrawn EP1351259A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03002156A EP1351259A1 (fr) 2002-02-13 2003-02-03 Résistance

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02425073 2002-02-13
EP02425073 2002-02-13
EP03002156A EP1351259A1 (fr) 2002-02-13 2003-02-03 Résistance

Publications (1)

Publication Number Publication Date
EP1351259A1 true EP1351259A1 (fr) 2003-10-08

Family

ID=28043275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03002156A Withdrawn EP1351259A1 (fr) 2002-02-13 2003-02-03 Résistance

Country Status (1)

Country Link
EP (1) EP1351259A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122556A (zh) * 2010-12-07 2011-07-13 陕西宝成航空仪表有限责任公司 线绕电阻体间绕工艺
EP3920195A1 (fr) * 2020-06-03 2021-12-08 First Resistor & Condenser Co., Ltd. Résistance enroulée à fil empilé et son procédé de fabrication

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE226801C (fr) *
DE318301C (fr) *
US1691869A (en) * 1924-07-03 1928-11-13 Frank F Fowle Electrical conductor
GB574926A (en) * 1944-08-24 1946-01-25 Thomas Bolton And Sons Ltd Improvements in electric conductors
US3708650A (en) * 1970-01-21 1973-01-02 Tronicair Int Ltd Electrical heating apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE226801C (fr) *
DE318301C (fr) *
US1691869A (en) * 1924-07-03 1928-11-13 Frank F Fowle Electrical conductor
GB574926A (en) * 1944-08-24 1946-01-25 Thomas Bolton And Sons Ltd Improvements in electric conductors
US3708650A (en) * 1970-01-21 1973-01-02 Tronicair Int Ltd Electrical heating apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102122556A (zh) * 2010-12-07 2011-07-13 陕西宝成航空仪表有限责任公司 线绕电阻体间绕工艺
CN102122556B (zh) * 2010-12-07 2012-11-14 陕西宝成航空仪表有限责任公司 线绕电阻体间绕工艺
EP3920195A1 (fr) * 2020-06-03 2021-12-08 First Resistor & Condenser Co., Ltd. Résistance enroulée à fil empilé et son procédé de fabrication

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