CN115996490A - High-bending heating wire and radiator - Google Patents
High-bending heating wire and radiator Download PDFInfo
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- CN115996490A CN115996490A CN202111214011.6A CN202111214011A CN115996490A CN 115996490 A CN115996490 A CN 115996490A CN 202111214011 A CN202111214011 A CN 202111214011A CN 115996490 A CN115996490 A CN 115996490A
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Abstract
The present invention relates to a high-bending heater wire and a heat radiator. Providing: a heater wire for use in automobiles and the like, which can be reduced in diameter and has high bending durability, and a radiator body to which the heater wire is attached. The above problems are solved by the following constitution: the fiber core (1), a heat release part formed by spirally winding a plurality of heat release wires (2) arranged on the outer periphery of the fiber core (1), and an insulating shell (3) arranged on the outer periphery of the heat release part, wherein the Shore hardness (D grade) of the insulating shell (3) is more than 55. The insulating sheath (3) is preferably made of nylon, polyester elastomer, or a fluororesin such as ETFE, FEP or PFA, and is preferably an extrusion coating having a thickness of 0.03mm or more and 0.30mm or less.
Description
Technical Field
The present invention relates to a high-bending heater wire and a heat radiator, and more particularly, to: a highly flexible heating wire for use in automobiles and the like, and a radiator to which the heating wire is attached.
Background
The heater wire is used as a heat source for heating products such as electric carpets and electric carpets, heating elements for vehicles such as seat heaters and steering heaters, and forms suitable for the respective applications have been proposed. As a heating wire for a seat of an automobile, for example, patent document 1 proposes a heat radiation wire having a high tensile strength and being resistant to bending, and specifically, describes the following heat radiation wire: a) Twisting a plurality of heat-releasing wires to form a heat-releasing body, and providing an insulating sheath on the heat-releasing body; b) A spiral heat-releasing wire material wound on a core made of polyester or the like in a spiral manner, and an insulating sheath is provided thereon; c) A heat sink formed by twisting a plurality of heat sink wires, which is formed by spirally winding a core body of polyester or the like with an insulating sheath provided thereon; d) The heat sink is formed by helically winding 1 or more heat sink wires covered with insulation around a core such as polyester, and providing an insulating sheath thereon.
When the heater wire is attached to a seat of an automobile, it is pointed out that the heater wire is required to have flexibility and softness because it gives a feeling of foreign matter when sitting or floats to the surface of the skin of the seat. To meet this demand, in order to avoid the foreign body sensation, a gasket material has been thickened and a radiator has been attached through the gasket material. However, the gasket material is a heat insulating material and may prevent rapid heating of the surface of the seat, and conversely, if the rapid heating is to be improved, the power consumption of the radiator needs to be increased, which may cause restrictions in the battery capacity of the vehicle and the like.
In order to solve such a problem, for example, patent document 2 proposes a heat radiating body using a heat radiation wire excellent in seating feeling and having high durability and reliability. The heat radiator is composed of the following components: the wire rods of the plurality of silver-containing copper alloy wires reinforced with metal fibers are individually covered with insulation, the heat radiation wire arranged on the flexible support is formed in a twisted line shape, and the outside of the heat radiation wire is not covered. Thus, since the outer diameter is small, there is no uncomfortable feeling when seated, and since wires reinforced with metal fibers and respectively insulated are used, durability and reliability can be further improved.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 61-47087
Patent document 2: japanese patent laid-open No. 2007-134341
Disclosure of Invention
Problems to be solved by the invention
In recent years, for a heater wire used for a seat or the like of an automobile, it has been desired to cope with immediate heating (rapid heating) by wiring at a narrow pitch, and therefore, reduction in diameter has been demanded. The heat conduction of the heating wire with small outer diameter is good, the quick heating property can be improved, and the uncomfortable feeling during sitting can be reduced. However, if the outer diameter of the heating wire is reduced, local bending is easily caused.
The present invention has been made to solve the above problems, and an object thereof is to provide: a heater wire for use in automobiles and the like, which can be reduced in diameter and has high bending durability, and a radiator body to which the heater wire is attached.
Solution for solving the problem
The heating wire of the present invention is characterized by comprising: a fiber core; a heat radiation part formed by spirally winding a plurality of heat radiation wires around the outer periphery of the fiber core; and an insulating case provided on the outer periphery of the heat radiation portion, wherein the Shore hardness (D scale) of the insulating case is 55 or more.
According to the present invention, since the shore hardness of the insulating case is 55 or more, the insulating case is hard, and local bending is not easily caused even when the insulating case is reduced in diameter for wiring at a narrow pitch. As a result, the diameter can be reduced to a level that is free from discomfort during sitting, and the wiring can be made to have a narrow pitch when forming the radiator, and bending durability can be improved.
In the heating wire of the present invention, the insulating sheath is made of nylon, polyester elastomer, or a fluororesin such as ETFE, FEP, PFA, or the like.
In the heating wire of the present invention, the insulating sheath is an extrusion coating having a thickness of 0.03mm or more and 0.30mm or less.
In the heating wire of the present invention, the drawing force when the insulating case is drawn from the heat radiating portion is in a range of 1N to 8N.
In the heating wire of the present invention, the heat radiation wire is a metal wire or a baked wire having an insulating film provided on the metal wire.
The heat sink of the present invention is characterized in that the heating wire of the present invention is mounted.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there may be provided: a heater wire for use in automobiles and the like, which can be reduced in diameter and has high bending durability, and a radiator body to which the heater wire is attached.
Drawings
Fig. 1 is a schematic explanatory view showing an example of the heating wire of the present invention.
Fig. 2 is an explanatory diagram of the heat release line.
Fig. 3 is an explanatory diagram showing a scheme of the bending test.
Fig. 4 is an explanatory diagram of a measurement sample (a) and a measurement method (B) of the pulling force.
Description of the reference numerals
1. Fiber core
2. Radiating wire
2a Metal wire rod
2b insulating film
3. Insulating housing
10. Heating wire
41. Load of
42. Core rod
43. Guide piece
51. Clamp
52. Drawing member
53. Hole(s)
54. Drawing direction
Detailed Description
The heater wire and the heat sink according to the present invention will be described below with reference to the drawings. The present invention is not limited to the illustrated embodiments.
[ heating wire ]
As shown in fig. 1, a heating wire 10 of the present invention includes: a fiber core 1; a heat radiation part formed by spirally winding a plurality of heat radiation wires 2 arranged on the periphery of the fiber core 1; and an insulating case 3 provided on the outer periphery of the heat radiation portion. The insulating case 3 is configured to have a shore hardness (D scale) of 55 or more. The term "having" means that other components may be included within a range that does not hinder the effects of the present invention, and for example, a plating layer (not shown) may be provided on the surface of the metal wire 2a, the insulating coating 2b may be provided, or a fusion layer may be provided on the outer periphery of the insulating housing 3.
The components of the heater wire will be described in detail below.
(fiber core)
The fiber core 1 is a necessary structure as a core material located at the center of the cross-sectional heating wire 10, and preferably functions as a high tension body of the winding core. The center in the cross section is a position at which the center position of the fiber core 1 coincides or substantially coincides with the center position of the cross section of the heater wire 10 in the cross section. As an example of the fiber core 1, a fiber yarn obtained by bundling a plurality of fibers is preferably used. The fibers constituting the filaments are preferable in terms of strength and heat resistance. Examples of the fibers include polyester fibers such as tetron (registered trademark), wholly aromatic polyamide fibers such as Kevlar (registered trademark), polyarylate fibers such as Vectran (registered trademark), and glass fibers. The fiber core 1 may be obtained by arbitrarily compounding fibers of different materials and filaments of different outer diameters.
The fiber core 1 is formed by forming a fiber into a gathered yarn, a twisted yarn, or a braided yarn, and has a cross section of concentric circle (perfect circle) or substantially concentric circle. In this case, in order to make the fiber core 1 have a concentric or substantially concentric cross section, it is more preferable to make the fiber yarn be a twisted yarn. The outer diameter of the fiber core 1 is not particularly limited, and may be, for example, in the range of 0.1 to 1.0 mm. Since the fiber core 1 formed of the fiber yarn is soft and easily deformed, when the fiber core 1 is in a perfect circle shape, the outer diameter of the fiber core 1 is regarded as the outer diameter thereof, and when the fiber core 1 is in a flat shape, the outer diameter of the fiber core 1 is evaluated as the outer diameter converted from the cross-sectional area thereof to the cross-sectional area of a perfect circle shape.
The fiber core 1 is generally represented by a fineness (dtex) expressed in terms of weight of fiber yarn, and 1dtex is 1g at a length of 10000 m. The dtex of the fiber core 1 is preferably in the range of 110 to 2000dtex. The fiber core 1 may be formed of a single fiber or may be formed of 2 or more fibers. When the fiber core 1 is constituted by at least 2 kinds of fiber forming members, the total dtex may be set within the above range. When the content is less than 110dtex, durability tends to be insufficient. On the other hand, if the content exceeds 2000dtex, the outer diameter becomes large, which easily affects workability and workability.
(exothermic part)
The heat radiation portion is an essential component formed by winding a plurality of heat radiation wires 2 around the outer periphery of the fiber core 1 in a spiral shape. The heat radiation line 2 is a resistance line which radiates heat by a current, and may be arbitrarily selected and used as resistance lines having a predetermined resistance value and the number thereof according to a radiation system. For example, in the embodiment described below, 6 heat radiation wires 2 are simultaneously wound in a spiral shape, and each 6 wires is wound in a single layer. The final outer diameter of the heater wire 10 is usually a single layer, but may be 2 layers so that the final outer diameter does not become thicker.
The heat radiation wire 2 is constituted by using a plurality of resistance wires having a diameter of 0.04mm or more and 0.2mm or less. By spirally winding the thin heat radiation wire 2, the diameter can be reduced, and the reduction in diameter, weight, and softening of the entire heat radiation wire can be achieved. The plurality of strips is a range of the number of strips which can be spirally wound as shown in fig. 1, and in the embodiment described later, 6 strips are used, but for example, 1 to 10 strips are preferable. The pitch at the time of winding in a spiral shape varies depending on the diameter of the fiber core 1 and the diameter of the heat radiation wire 2, and therefore, it is not possible to make a summary, for example, winding at a pitch of 0.2 to 2.5mm is preferable.
The heat radiation line 2 may be: as shown in fig. 2 (a), the wire member 2a alone or as shown in fig. 2 (B), the wire member 2a is provided with an insulating film 2B and baked. Examples of the metal wire 2a include copper wires and copper alloy wires. Examples of the copper alloy wire include CuAg alloy, cuSn alloy, cuNi alloy, and the like. A plating layer may be applied to the surface of the metal wire 2 a. As the plating layer, a solder plating layer, a tin plating layer, a gold plating layer, a silver plating layer, a nickel plating layer, and the like are preferable. Examples of the insulating film 2b include Polyurethane (PU), polyester imide (PEI), polyimide (PI), and polyamide imide (PAI) having heat resistance. The thickness of the insulating coating film 2b is 1, 2, or 3 in general japanese industrial standard (JIS C3202:2014), and any thickness may be selected from these.
(insulating housing)
The insulating housing 3 is provided so as to cover the heat radiation wire 2. For example, the heat radiation wire 2 may be formed by resin extrusion or the like so as to cover the outer periphery thereof after being provided. The insulating case 3 may be made of a resin material having insulating properties and heat resistance, and the shore hardness (D scale) of the insulating case 3 is 55 or more in the present invention. Since the entire insulating case is made of a hard resin having a shore hardness of 55 or more, stress concentration in a specific portion is less likely to occur, and bending due to stress concentration can be prevented from occurring even when stress is applied during manufacturing or wiring. When the Shore hardness is less than 55, bending is likely to occur if stress is applied.
The insulating case 3 is not particularly limited as long as the shore hardness is 55 or more. Examples thereof include: an insulating resin such as nylon, polyester elastomer, ETFE, FEP, PFA, etc. having a Shore hardness of 55 or more. Nylon having a shore hardness of 55 or more includes nylon 12 (shore D78), nylon 11 (shore D63 to 72), nylon 6 (shore D55 or more), and the like. In the examples described below, nylon 12 of shore D78, polyester elastomer of shore D75, ETFE of shore D67, FEP of shore D55, PFA of shore D62 were used. The PVC used in the comparative example described later has a shore hardness of 40 to 50 (specifically, PVC of shore D40 is used). The shore hardness (D scale) is a value measured according to ISO 868.
The thickness of the insulating case 3 also varies depending on the outer diameter of the heat radiation portion and the outer diameter of the final heater wire, and is preferably 0.03mm or more, more preferably 0.05mm or more, and on the other hand, preferably 1.0mm or less, more preferably 0.30mm or less.
The insulating housing 3 is desirably formed by resin extrusion. The insulating case 3 formed by extrusion of the resin having a shore hardness of 55 or more is easily formed to have a constant thickness, and the surface roughness is small. Further, since the insulating case 3 made of a hard material is provided with a predetermined thickness, the heat radiation wire 2 can be prevented from floating up as much as possible from the surface irregularities of the insulating case 3 due to the irregularities occurring when the heat radiation wire is spirally wound. By providing the hard insulating cover 3 formed by extrusion as the outermost layer, local bending is less likely to occur even when the diameter is reduced for wiring at a narrow pitch. As a result, the diameter can be reduced to a level that is free from discomfort during sitting, and the wiring can be made to have a narrow pitch when forming the radiator, and bending durability can be improved.
It is desirable that the conditions (setting of molding temperature, setting of molding jig such as a die and a joint, etc.) at the time of extrusion molding of the insulating case 3 be set to stable and appropriate values, and as a result, as described in the embodiment described later, the drawing force at the time of drawing the insulating case 3 from the heat radiation portion (heat radiation line 2) can be set to a range of 1N to 8N. By making the drawing force within this range, there are the following advantages: the heat radiation portion (heat radiation wire 2) and the insulating case 3 are properly adhered to each other, and there is no misalignment of the insulating case 3 when the insulating case 3 is peeled off during the termination process of the heater wire 10, and a predetermined dimensional accuracy is provided, and there is no adverse effect on the bending durability. On the other hand, when such a condition cannot be set to a stable and appropriate value, the drawing force may be lower than 1N or exceeds 8N. When the drawing force is less than 1N, the adhesion between the heat radiation portion (heat radiation wire 2) and the insulating sheath 3 may be weak, and the position of the insulating sheath 3 may be shifted when the insulating sheath 3 is peeled off during the termination process of the heater wire 10, and the predetermined dimensional accuracy may not be obtained, or the bending durability may be poor. When the pulling force exceeds 8N, the adhesion between the heat radiation portion (heat radiation line 2) and the insulating sheath 3 may be too strong, and the insulating sheath 3 may not be separated from the heat radiation portion (heat radiation line 2) when the insulating sheath 3 is peeled off during the termination process of the heater wire 10, and the heat radiation line 2 may be stretched.
[ radiator ]
The heat sink of the present invention is similar to a heat sink of a known form except that the heater wire 10 of the present invention is applied. That is, since the heat sink of the present invention is mounted with the heater wire 10 of the present invention, a heat sink having the heater wire 10 with excellent bending durability can be provided.
The heat radiator may be used for various purposes, and examples thereof include heating products such as electric carpets and electric carpets, heating elements for vehicles such as seat heaters and steering heaters, and may be preferably mounted on seats for automobiles. In a heat radiator as a heating member for an automobile, a heater wire is disposed by being sewn into an object such as a seat base material.
The heater wire 10 of the present invention can achieve the reduction in the diameter and bending durability of the entire heater wire, and therefore, it becomes easy to stitch the heater wire 10 to an object such as a seat base material constituting a radiator at a narrow pitch, and the minimum bending radius can be reduced.
The thinner and softer the diameter of the heater wire, the more preferably the heater wire 10 of the present invention meets both for sewing the heater wire to the seat substrate, and therefore is advantageous in that the minimum bend radius can be reduced for sewing in. When the bending radius is reduced and the seam is formed, the heater wire 10 is stressed, but the heater wire 10 of the present invention has high resistance to such stress, and therefore has the following advantages: to reduce the diameter of a seat without causing discomfort, and to provide a narrow-pitch wiring for forming a radiator.
Examples
The present invention will be described in further detail with reference to examples. The present invention is not limited to this.
Example 1
As the fiber core 1, a fiber core in which a polyarylate fiber was drawn to have an outer diameter of about 0.17mm was used. In the fiber core 1, 6 copper alloy wires having an outer diameter of 0.10mm were wound in a spiral shape at a pitch of 1.5mm as the heat radiation wires 2 so that the 6 wires simultaneously become a single layer (see fig. 1). The copper alloy wire used in this case was about 2Ω/m. Next, a polyester elastomer having a property of shore D75 was used, and melt-extrusion was performed so as to have a thickness of 0.21mm, thereby forming insulating sheath 3. The heating wire 10 having a total outer diameter of 0.90mm was thus manufactured.
Example 2
A heater wire 10 was produced in the same manner as in example 1, except that the insulating housing 3 was formed using nylon 12 having a property of shore D78.
Example 3
A heater wire 10 was produced in the same manner as in example 1, except that ETFE having a property of shore D67 was used to form the insulating housing 3.
Example 4
A heater wire 10 was produced in the same manner as in example 1, except that the insulating sheath 3 was formed using FEP having a property of shore D55.
Example 5
A heater wire 10 was produced in the same manner as in example 1, except that PFA having a property of shore D62 was used to form the insulating housing 3.
Comparative example 1
A heater wire 10 was produced in the same manner as in example 1, except that PVC having a property of shore D40 was used as the insulating housing 3.
[ evaluation of Property ]
(bending durability)
The bending durability test is shown in fig. 3 as follows: the heater wire 10 having a length of 1000mm produced in each of the examples and comparative examples was sandwiched between the plugs 42 and 42 having a radius of 5mm, a load 41 was attached to the lower end of the heater wire 10, and the number of bends was measured at a rate of 30 bends per minute on both sides of the heater wire 10 at a rate of 1 bend in the direction perpendicular to the plug 42. The number of bending times was evaluated as the number of times the resistance value of the heater wire 10 increased by 10%. Since the number of bending times of the heating wire 10 to be tested exceeds 5000 times, the evaluation was designated as "good", and the measurement was ended at the time of the exceeding. On the other hand, in comparative example 1, the number of bending times did not reach 5000, and therefore, the evaluation was designated as "Δ (poor)".
(appearance)
The surface of each heater wire 10 was visually observed and evaluated by an optical microscope. The evaluation was as follows: the case where the irregularities are noticeable is designated as "(" quite bad "), the case where the irregularities are slightly less noticeable is designated as" Δ (slightly bad) ", and the case where the irregularities are not noticeable is designated as" good ".
TABLE 1
TABLE 1
| Hardness of the pin type | Bending durability | Appearance of | |
| Example 1 | D75 | ○ | ○ |
| Example 2 | D78 | ○ | ○ |
| Example 3 | D67 | ○ | ○ |
| Example 4 | D55 | ○ | ○ |
| Example 5 | D62 | ○ | ○ |
| Comparative example 1 | D40 | △ | ▲ |
(drawing force)
The drawing force was measured by the method shown in fig. 4. As shown in fig. 4 a, the sample was obtained by cutting the resulting heater wire 10 to ensure that the length of the portion (between BC) holding the insulating case 3 was 50mm and the length of the exposed portion (between AB) of the heat radiation portion (heat radiation line 2) was 25mm or more, and removing the insulating case 3 at the end. As shown in fig. 4 (B), the measurement is as follows: first, the exposed heat radiation portion (heat radiation wire 2) is inserted into the hole 53 of the drawing member 52, and then fixed by the jig 51. The insulating housing 3 that did not pass through the hole 53 is held at the periphery of the hole 53, and in this state, the drawing member 52 is moved in the drawing direction 54 at a speed of about 250 mm/min. At this time, the force measured by the load measuring machine was used as a pulling force when the insulating case 3 was pulled from the heat radiation portion (heat radiation line 2), and evaluated by N (newton).
The drawing force was evaluated based on the following criteria based on the experimental results performed in advance. When the pulling force is less than 1N, the adhesion between the heat radiation portion (heat radiation wire 2) and the insulating sheath 3 is weak, and the position of the insulating sheath 3 is shifted when the insulating sheath 3 is peeled off during the termination process of the heater wire 10, and thus the predetermined dimensional accuracy is not obtained, or the bending durability is poor, and thus the result is referred to as "Δ (poor)". When the pulling force exceeds 8N, the adhesion between the heat radiation portion (heat radiation line 2) and the insulating case 3 is too strong, and the insulating case 3 does not separate from the heat radiation portion (heat radiation line 2) when the insulating case 3 is peeled off during the termination process of the heater wire 10, and the heat radiation line 2 is elongated, and thus is referred to as "Δ (poor)". On the other hand, when the pulling force is in the range of 1N or more and 8N or less, the adhesion between the heat radiation portion (heat radiation wire 2) and the insulating sheath 3 is moderate, and there is no misalignment of the insulating sheath 3 when the insulating sheath 3 is peeled off during the termination processing of the heater wire 10, and a predetermined dimensional accuracy is brought about, and the bending durability is not adversely affected, so that it is referred to as "good". The drawing force was measured for the heater wire 10 of examples 1 to 5. As a result, the number of "good" was within the range of 1N to 8N.
Claims (7)
1. A heater wire, comprising: a fiber core; a heat radiation part formed by spirally winding a plurality of heat radiation wires around the outer periphery of the fiber core; and an insulating case provided on the outer periphery of the heat radiation portion, wherein the Shore hardness (D scale) of the insulating case is 55 or more.
2. The heater wire of claim 1, wherein the insulating housing is nylon, polyester elastomer, or fluororesin.
3. The heater wire of claim 2, wherein the fluororesin is ETFE, FEP or PFA.
4. A heater wire according to any one of claims 1 to 3, wherein the insulating sheath is an extrusion coating having a thickness in the range of 0.03mm to 0.30 mm.
5. The heater wire according to any one of claims 1 to 4, wherein a pulling force when the insulating housing is pulled from the heat radiating portion is in a range of 1N to 8N.
6. The heater wire according to any one of claims 1 to 5, wherein the heat release wire is a metal wire or a baked wire having an insulating coating provided on the metal wire.
7. A heat sink, wherein the heater wire according to any one of claims 1 to 6 is attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214011.6A CN115996490A (en) | 2021-10-19 | 2021-10-19 | High-bending heating wire and radiator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111214011.6A CN115996490A (en) | 2021-10-19 | 2021-10-19 | High-bending heating wire and radiator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115996490A true CN115996490A (en) | 2023-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111214011.6A Pending CN115996490A (en) | 2021-10-19 | 2021-10-19 | High-bending heating wire and radiator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115996490A (en) |
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2021
- 2021-10-19 CN CN202111214011.6A patent/CN115996490A/en active Pending
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