KR101303186B1 - Electric heating sheet for direct current - Google Patents

Abstract

PURPOSE: A carbon thread electric heating sheet with DC is provided to maintain uniform voltage distribution and prevent a current conflict or a voltage drop, thereby preventing a fire and lifetime shortening. CONSTITUTION: An electric heating sheet with DC comprises a first insulation sheet; a second insulation sheet attached to the bottom of the first insulation sheet; carbon threads which are arranged with a constant interval between the first insulation sheet and the second insulation; a temperature controller (80) controlling heating temperatures of the carbon threads; a temperature sensor (90) electrically connected to the temperature controller to be open or closed according to the changes of the heating temperature; and a bimetal (100) electrically connected to the temperature controller and blocking current when the carbon treads are overheated. [Reference numerals] (80) Temperature controller

Description

Carbon company DC heat transfer sheet {Electric heating sheet for Direct Current}

The present invention relates to a heat transfer sheet using carbon yarn (carbon fiber) as a heating element, and more particularly, heat generation occurs uniformly without temperature variation without generation of electromagnetic waves, and also enables reliable electrical connection between the heating element and the power supply. Of course, the present invention relates to a DC heat transfer sheet capable of improving electrical safety by preventing contact resistance.

In general, various heating apparatuses that convert electrical energy, including bed sheets, blankets, electrical mats, electrical mats, and electrical pads, into thermal energy are used to generate heat by electric resistance of the heating element. It is equipped with a heat transfer sheet that generates no harmful gas or noise during operation.

The heat transfer sheet has a built-in safety device that prevents fire and prevents the user from being burned when the heating element is partially heated due to folding or when the surface temperature rises abnormally. Because of this narrowing, there is a risk of local overheating and short circuit.

However, the use of direct current (AC) power as the power source of the heat transfer sheet is likely to adversely affect the user's health due to the fact that a certain amount of electromagnetic waves are emitted when current flows, which is a problem of modern people who prefer well-being life. In addition to the pattern and the tendency of consumption, there is a limit not only to act as a cause of avoiding the use of the heat transfer sheet but also to adversely affect the merchandise of various articles employing the same.

On the other hand, when using heating wires such as nichrome, copper, nickel alloy and aluminum as the heating element of the heat transfer sheet, local heating occurs only around the heating wire, causing severe temperature deviation and changing physical properties when overheating due to overload and fire hazard due to short circuit. In recent years, carbon thread (carbon thread) is mainly used that emits far-infrared rays, which are very high in electrical efficiency and beneficial to the human body.

The carbon company has a physical property of emitting heat energy close to natural energy when there is little electromagnetic wave when using a direct current (DC) power source. In other words, applying a DC power supply of 30V or less, which is an industrial safety standard, to the carbon company, it is possible to minimize the risk of fire and burn by maintaining a constant and stable heating state at the optimum temperature due to its constant temperature characteristics.

However, when commercial AC power is converted into DC power and supplied to a conventional heat transfer sheet that uses carbon as a heating wire, a current having an output voltage of about 24 V and 8.3 A is supplied to the carbon company through a conductor so that it is in conformity. Because the current is not uniformly transferred to the entire carbon yarns that are wired in a certain pattern between the insulating sheets of, the contact resistance and heat generation distribution are not uniform. There is a weak problem of about 35 ℃.

Moreover, the conventional heat transfer sheet is used to cut the insulation sheet, the conductor, and the carbon yarn at the same time in order to improve productivity in the manufacturing process, and then repeatedly cut one form in a size suitable for a specific use by using a cutter or scissors. At this time, due to the morphological characteristics of the carbon yarn formed by twisting a plurality of thin fibers, lint occurs at the cut end, and the current may leak out between the insulating sheets, and the adhesive of the conductor may be used for a long time. Due to the natural hardening, the binding force with the carbon yarn is lowered, so that the carbon yarn is separated from the conductor and freely flows, thereby increasing the contact resistance. As a result, there is a safety problem that causes electric safety accidents such as power loss and fire.

Republic of Korea Patent Publication No. 10-0723734 (2007.05.30) Republic of Korea Patent Publication No. 10-0762344 (2007.10.02) Republic of Korea Patent Publication No. 10-0883169 (2009.02.10) Republic of Korea Patent Publication No. 10-2010-0027508 (2010.03.11) Republic of Korea Patent Publication No. 10-1171470 (2012.08.06) Republic of Korea Patent Publication No. 10-2009-0058608 (2009.06.10)

Accordingly, the present inventors put emphasis on solving the above-mentioned matters and solving the problems, so that the heat generation of carbon yarn, which is a heating element, occurs uniformly without temperature variation, and the electrical connection between the carbon yarn and the conductor is maintained firmly, resulting in local contact due to contact resistance. The invention was completed by devising the present invention during the intensive study to develop a DC heat transfer sheet to prevent the temperature rise.

Therefore, the technical problem and object of the present invention is to provide a DC heat transfer sheet that allows heat generation to occur uniformly without temperature variation.

Another technical problem and object of the present invention is to provide a DC heat transfer sheet that can maintain a stable and stable electrical connection state of the heating element and the conductor.

In order to achieve the above technical problem and object, an embodiment of the present invention provides a first insulating sheet and a second insulating sheet conforming to the lower surface of the first insulating sheet, and the first and second insulating sheets. A plurality of carbon yarns wired side by side with a predetermined distance therebetween, and a first conductive strip electrically connected to both ends of the carbon yarns, one of which is connected to the cathode of the power source and the other of which is connected to the anode of the power source; A pair of second conductive bands formed to be wider than the width of the first conductive bands and attached to cover both upper and lower sides of the first conductive bands while being electrically connected to both ends of the carbon conductive yarns; Both ends of the conductive adhesive and the carbon yarns applied to maintain the attachment state of the first and second conductive bands and the outer ends of the second conductive bands are folded and folded together with the outer edges of the first and second insulating sheets. so that Attached insulation tape, temperature controller to control the heat generation temperature of the carbon yarns, and electrically connected to the temperature controller, and electrically connected to the temperature sensor and temperature controller to control the power supply while opening and closing according to the temperature change of the carbon yarns. To provide a DC heat transfer sheet characterized in that it comprises a bimetal to cut off the current when the carbon companies overheat.

As a result, in the present invention, the heat generation of the carbon yarn is uniformly performed without temperature variation, and the electrical connection state between the carbon yarn and the first and second conductive strips is firmly and stably maintained, thereby improving electrical safety.

In a preferred embodiment of the present invention, the first conductive band is electrically connected to both ends of the carbon yarns while the upper and lower pairs are matched, and the first conductive band is made of any one of copper foil, nickel foil, and titanium foil. The two conductive strips may be made of either aluminum foil or silver foil.

In another embodiment of the present invention, the conductive adhesive includes a micron-sized powder in which any one or two or more of Ag, Cu, Al, and Ni are mixed, and the pressure-sensitive adhesive is maintained at -35 ° C to 95 ° C. Can be.

According to the present invention having the means and configuration for solving the technical problem as described above, since the first conductive strip is primarily connected to the carbon company to supply power stably, the heat generation of the carbon company occurs uniformly without a temperature variation, In addition, the second conductive strip smoothly supplies the power supplied through the first conductive strip to the carbon companies as well as maintains the electrical connection state between each other more firmly and stably so that the heat generation of the carbon companies is more smooth and normal. Get up.

Therefore, not only can the convenience and electrical safety be improved, but the overall voltage distribution can be maintained and current collision or voltage drop can be prevented, thereby preventing fire or shortening of service life due to malfunction or concentration of heating temperature or deviation. have.

FIG. 1 is a perspective view schematically showing a state before folding and folding both edge portions of a DC heat transfer sheet according to an exemplary embodiment of the present invention.
Figure 2 is a side cross-sectional view schematically showing a local portion of the DC heat transfer sheet according to an embodiment of the present invention.
3 is a plan view schematically showing a DC heat transfer sheet according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described more specifically with reference to the accompanying drawings.

Prior to this, the following terms are defined in consideration of the functions of the present invention, and they are to be construed to mean concepts that are consistent with the technical idea of the present invention and interpretations that are commonly or commonly understood in the technical field of the present invention.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

The accompanying drawings are exaggerated or simplified to illustrate and explain the structure and operation of the present invention in order to facilitate understanding and clarity, and it should be understood that each component does not exactly coincide with the actual size.

1 and 2, the DC heat transfer sheet according to the embodiment of the present invention is largely the first and second insulating sheets 10, 20, carbon yarn 30, the first conductive strip 40 And a second conductive strip 50, an adhesive 60, and an insulating tape 70.

The first and second insulating sheets 10 and 20 are made of a cloth or film having a predetermined width and length, and serve as a function of the outer skin, and serve to insulate the carbon yarn 30 from the outside. Thermo-compression processing such as glass fiber, synthetic fiber, natural fiber, synthetic leather, natural leather, polymer film or fabric such as PE, PET, etc. with excellent heat resistance that can withstand the high temperature heat generated from the It may be formed of an electrical insulator having the property of not melting at the time and maintaining shape stability within a certain temperature range.

The first and second insulating sheets 10 and 20 may be coated with a thermosetting adhesive and firmly matched together by heating and pressing using a thermocompression roller or the like.

Here, the thermosetting adhesive melts when heat of about 100 to 150 ° C. is applied, and when it is dried for about 24 to 48 hours between 40 to 60 ° C. after processing, the gel state does not completely cure, that is, it exhibits a firm bonding strength while maintaining flexibility. In addition, it is preferable to use a material that sufficiently removes the components causing bubbles such as volatile components and reaction residues, and by employing it, the first and second insulating sheets 10 and 20 are naturally contacted. Flexibility and electrical safety according to the use, such as bending or bending can be secured.

In addition, the first and second insulating sheets 10 and 20 may be formed by interposing the carbon yarns 30 in a specific pattern and weaving the weft yarns and the warp yarns in a planar manner.

The carbon yarns 30 are plurally arranged side by side at a predetermined interval between the first and second insulating sheets 10 and 20 so as to generate heat by electrical resistance, and either one of the two ends of the carbon yarn 30 A first conductive strip 40 electrically connected to an external positive terminal side or between a pair of upper and lower sides, and the opposite side of the first conductive wire is electrically connected to an external negative terminal side through a negative electrode wire It is connected to the belt 40 or between a pair of upper and lower sides.

Herein, the carbon yarn 30 generates heat at a high temperature by its own resistance when an external power source is applied, and it is preferable to use one in which a specific resistance is constant, elasticity and durability are excellent, and oxidation does not occur. For example, a bundle of fine-thick carbon fibers in which conductive carbon black is bonded to a polyester yarn or cotton yarn by a special method can be formed as one group.

The first conductive strip 40 is a stable supply of power primarily to the carbon yarns 30, the carbon conductors in a state in which orthogonal to both ends of the carbon yarns 30 or a pair of upper and lower ones are matched ( It is provided so as to be orthogonal to both ends of the 30, respectively connecting and covering both ends of the carbon yarns 30 in parallel while one of them is connected to the cathode of the power source and the other is connected to the anode of the power source ( 30) are electrically connected.

That is, the first conductive strip 40 attached to one end of the carbon yarns 30 of the first conductive strips 40 is electrically connected to the external positive electrode terminal side through the positive wire, and the carbon yarn 30 The first conductive strip 40 attached to the other end of the terminals is electrically connected to the external negative terminal side through the negative electrode wire.

Here, since the first conductive strip 40 serves as a power supply line for supplying power to the carbon yarns 30, the width of the first conductive strip 40 is relatively narrow and excellent in conductivity, and the thickness is 0.045 mm. It is preferably made of a copper foil, a nickel foil, a titanium foil, or the like having a ± 0.005 mm surface resistance (kPa / sq) of 10 ⁵ or less.

The first conductive strip 40 allows the power supply to be firmly connected to the carbon yarn 30, so that the resistance value of the actual power supply is substantial even if the length of the carbon yarns 30 is long or the total width of the wires is increased. Since the voltage drop does not occur at all and the current distribution is uniform, local heating or local low temperature phenomenon can be prevented.

The second conductive strip 50 is to smoothly supply the power supplied through the first conductive belt 40 to the carbon yarns 30 to maintain the electrical connection state more firmly and stably. , The width of the first conductive strip 40 is three times wider than that of the first conductive strip 40, and covers the upper and lower sides of the first conductive strip 40 between the first and second insulating sheets 10 and 20. Both ends of the head office 30 are electrically connected to each other.

That is, the second conductive strip 50 is made up of a pair of upper and lower ends of the carbon yarns 30 and both the first conductive strip 40 and the first and second insulating sheets 10 and 20 interposed therebetween. It is attached in between.

Here, since the second conductive strip 50 serves to stably connect the carbon yarns 30 while supplying power smoothly, the second conductive strip 50 is relatively wider in width than the first conductive strip 40 and slightly inferior in conductivity, and has a thickness of 0.04. It is preferable that the sheet is made of an aluminum thin plate, a silver thin plate, or the like having a mm ± 0.005 mm and a surface resistance (Ω / sq) of 10 ⁵ or less.

In other words, when the first conductive band 40 is excluded and only the second conductive band 50 is used, the current is concentrated on only some carbon yarns 30 without being constantly transmitted to the carbon yarns 30 due to the characteristics of the DC power source. There is a problem that fever occurs only locally.

On the contrary, when the second conductive band 50 is excluded and only the first conductive band 40 is used, current may be evenly supplied to the carbon yarns 30, but heat generation of the carbon yarns 30 may not occur smoothly. There is a problem of exothermic or temperature distribution with abnormal temperature.

That is, the carbon yarn 30 has a physical property that is a resistor and the electrical characteristics of a DC power source used as its operating power source. As the carbon yarn 30 becomes farther from the power source, the resistance value increases to generate a momentary voltage drop and a current amount. Therefore, if the first conductive belt 40 is excluded, current may not flow normally in the carbon yarn 30, causing local low temperature phenomenon or heat generation itself. I'm ready to.

Therefore, by interposing the first conductive strips 40 narrower by 1/3 than the width between the second conductive strips 50 and connecting the power supply thereto, the current is normally supplied to the carbon yarns 30. Of course, the electrical connection state between each other can be more firmly and stably maintained, and through this, the carbon yarns 30 can more smoothly and safely generate heat.

If the width of the first conductive belt 40 is formed to be 1/3 or more than the width of the second conductive belt 50, the cross-sectional area is increased, and thus the electric resistance is also large, so that the surroundings are easily burned, and thus are vulnerable to fire accidents. On the other hand, if the width of the first conductive belt 40 is less than 1/3 of the width of the second conductive belt 50, the current may not flow smoothly, which may result in an ineffective function and role.

The pressure-sensitive adhesive 60 imparts conductivity so that each electrical connection state is stably maintained while maintaining the attachment state of both ends of the carbon yarns 30 and the first and second conductive strips 40 and 50. The first conductive strips 40 and the second conductive strips 50 are evenly coated between the surfaces of the conductive strips facing each other.

That is, since both ends of the carbon yarns 30 and the first and second conductive strips 40 and 50 maintain the electrical connection state through the conductive adhesive 60, power is applied to the first conductive strip 40. When the energized state is made smoothly with each other when the carbon yarns 30 are more easily and stably perform the heat generating action.

The pressure-sensitive adhesive 60 is a pressure-sensitive adhesive in the range of -35 ℃ to 95 ℃ by uniformly mixing a predetermined amount of any one or two or more of Ag, Cu, Al, Ni in the form of a micron-size powder with a certain amount of cross-linking agent to the acrylic pressure-sensitive adhesive By using the retaining, the electrical connection between the carbon yarns 30 and the first and second conductive strips 40 and 50 is not only made more stable, but also thermal deformation during the heating process of the carbon yarns 30. It is possible to prevent damage and weakening of the adhesion state with the first and second conductive belts 40 and 50 due to.

Both ends of the insulating tape 70 of the carbon yarn 30 and the outer end of the second conductive strip 50 are folded together in the same direction with the outer edges of the first and second insulating sheets 10 and 20. It is attached to surround the outer edge portion of the first and second insulating sheets 10 and 20 to maintain the.

Here, the positions where the two ends of the carbon yarns 30 and the second conductive strips 50 are folded are preferably set within a range where interference with the first conductive strips 40 does not occur.

Meanwhile, both ends of the carbon yarns 30 and the outer end portions of the second conductive strips 50 are sewn in a state where they are folded and folded in the same direction with the outer edges of the first and second insulating sheets 10 and 20. After the first binding, the insulating tape 70 may be attached and finished.

As shown in FIG. 3, the DC heat transfer sheet according to the embodiment of the present invention further includes a temperature controller 80, a temperature sensor 90, and a bimetal 100.

Temperature controller 80 is provided to serve as a function and role of controlling the exothermic temperature of the carbon yarn (30). That is, the temperature controller 80 detects the temperature of the carbon yarns 30 and performs control to maintain the temperature set by the user and adjust the temperature to a desired temperature value.

The temperature sensor 90 is electrically connected to the temperature controller 80 and is opened and closed according to the temperature change of the carbon yarns 30 to control the power supply. That is, the temperature sensor 90 is provided in a state in which the control temperature is set to a reference value that satisfies the safety standard, and when the detected temperature is lower than the set temperature by comparing the detected and detected temperature with the set temperature, the carbon yarn 30 In order to apply the power to the furnace, on the contrary, if the temperature is higher than the set temperature, a series of processes to cut off the power applied to the carbon yarn 30 are repeatedly performed to maintain the specified temperature.

The bimetal 100 is electrically connected to the temperature controller and functions to cut off the current when the carbon yarns 30 are overheated. The bimetal 100 detects abnormal heat and is cut off when the overheating temperature reaches 95 ° C., for example. It is a non-returnable type that blocks current and cannot be adjusted for reuse after one operation.

In the DC heat transfer sheet according to the embodiment of the present invention configured as described above, both ends of the carbon yarn 30 are electrically and stably connected by the first and second conductive strips 40 and 50 and the conductive adhesive 60. Since the furnace is firmly attached between the first and second insulating sheets 10 and 20, it is possible to prevent the carbon yarn 30 from flowing or shorted during use and to evenly improve the flow of current. Both ends of the head office 30 and the outer end of the second conductive strip 50 are folded together in the same direction with the outer edges of the first and second insulating sheets 10 and 20 and folded on the insulating tape 70. Due to the solid binding, the electrical connection between the carbon yarn 30 and the first and second conductive strips 40 and 50 is further strengthened, and the electrical and physical properties thereof are changed well, so that both ends of the carbon yarn 30 are changed. This prevents leakage of current.

In addition, since the resistance value of each of the carbon yarns 30 is evenly distributed through the first and second conductive strips 40 and 50 and the conductive adhesive 60 without any deviation, heat generation normally operates to minimize temperature variation generated by each part. This can improve the electrical safety and ease of use during operation, and thus improve the quality.

In addition, since the edges of the first and second insulating sheets 10 and 20 are closed by the insulating tape 70, it is possible to secure waterproofness to completely prevent moisture or moisture from penetrating into the interior through the gap.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Various changes and substitutions may be made without departing from the spirit and scope of the invention. It can be changed to an embodiment.

For example, sheets, blankets, toilet seats, heating or winter heating clothing, gloves, shoes and blankets, cushions, mats, carpets, etc., for building or industrial heating or heating, drying equipment for agricultural and marine products, and frost protection for roads and parking lots. It can be widely applied in various industrial fields, such as various household goods or medical supplies requiring comfort and comfort and safety, such as car seats, curtains and clothing, for those of ordinary skill in the art It is obvious.

Therefore, it is intended that the present invention cover modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

10: first insulating sheet 20: second insulating sheet
30: carbon yarn 40: first conductive belt
50: second conductive strip 60: pressure-sensitive adhesive
70: insulating tape 80: temperature controller
90: temperature sensor 100: bimetal

Claims (4)

First insulating sheet;
A second insulating sheet conforming to a lower surface of the first insulating sheet;
A plurality of carbon yarns wired side by side at a predetermined interval between the first and second insulating sheets;
A first conductive strip electrically connected to both ends of the carbon yarns, one of which is connected to a cathode of a power source and the other of which is connected to a cathode of a power source;
A pair of second conductive strips formed wider than the width of the first conductive strips and electrically connected to both ends of the carbon yarns, respectively, and attached to cover upper and lower surfaces of the first conductive bands;
A conductive adhesive applied between both ends of the carbon yarns and between the second conductive bands to maintain the attached state of the first and second conductive bands;
An insulating tape attached to surround both ends of the carbon yarns and outer ends of the second conductive bands in a folded state with the outer edges of the first and second insulating sheets;
A temperature controller for controlling the exothermic temperature of the carbon yarns;
A temperature sensor electrically connected to the temperature controller and controlling the power supply while opening and closing according to the temperature change of the carbon yarns; And
A bimetal electrically connected to the temperature controller to block current when the carbon yarns are overheated;
/ RTI >
The first conductive strip is made of any one of a copper thin plate, a nickel thin plate, and a titanium thin plate having a thickness of 0.045 mm ± 0.005 mm and a surface resistance (10 / sq) of 10 ⁵ or less. Electrically connected,
The second conductive strip is 0.04mm ± 0.005mm in thickness and the surface resistance (Ω / sq) of 10 ⁵ or less DC heat transfer sheet consisting of any one of aluminum foil or silver foil.
delete The method of claim 1,
The conductive adhesive includes Ag, Cu, Al, Ni any one or two or more of the micron-size powder mixed, DC heat transfer sheet to maintain the adhesive force in the range of -35 ℃ ~ 95 ℃.
The method of claim 1,
The ratio of the width | variety of the width | variety of the said 1st conductive belt to the width | variety of a said 2nd conductive belt is a DC heat exchange sheet.

Images