KR101482494B1 - Electric heat pipe - Google Patents

Abstract

The present invention relates to a heating pipe using electricity and, more specifically, to an electric heating pipe which is heated by the electric heating of a heat transfer material by having a heat medium for a heat transfer in a pipe and the heat transfer material (electric heating material) for a heating. The present invention blocks power applied in the heat transfer material when the temperature of the heat medium exceeds a predetermined temperature and does not block power applied in the heat transfer material when the heat medium is equal to or lower than a predetermined temperature by more including a bimetal temperature switch in the heating pipe.

Description

[0001] Electric heat pipe [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a heating tube using electricity, and more particularly, to a heating tube for heat transfer inside a tube and an electric heater (electric heating body) for heating, .

Recently, there has been an increase in the number of floor heating in a restaurant, a dormitory, or a commercial house, where the floor is heated by a heating pipe with an electric heating element.

The heating pipe is embedded in a floor such as a heating pipe used in a conventional gas boiler or an oil boiler, filled with water or oil, and an electric heating line is inserted along the pipe to heat the electric heating line A method of heating the floor by using the water or oil as a heat transfer medium is used. This method eliminates the need for a separate boiler, eliminating the need for a boiler installation space, and it also helps to conserve energy because there is no heat loss that occurs when boiler water is sent along the pipe.

Such an electric heating pipe is sealed after inserting a heating wire inside the pipe and filling with water or insulating oil as a heat medium.

FIG. 1 is a schematic diagram showing a configuration of a general installation of a conventional electric heating pipe boiler, and FIG. 2 is a schematic diagram showing a configuration according to an electric system. 1 and 2, the electric wire 31 to be applied to the heating wire in the controller 30 on the upper side is inserted through the heating medium inlet 21 and the heating medium replenishment tank 22 are disposed so as to control the pressure expansion when the heat medium is insufficient or the pressure of the heating pipe 10 is increased. A heat medium level regulating pipe (23) is disposed below the heat medium replenishing tank (22) to regulate the level of the hot water which is a heat medium. Finally, the heating pipe 10 is connected.

In the controller (30), electric wires (31) for heating the hot water, which is the heating medium (12), are inserted into the heating pipe in two strands. The electric wire 31 is connected to the heating wire 11 as shown. In the heating pipe 10, the heating wire 11 is inserted and filled with a heating medium (water, oil, or the like). The heating wire 12 is connected to the electric wire 31 and is sealed by the sealing portion 12 to be inserted and fixed in the tube so that the heating medium can be heated in the tube. In order to prevent overheating of the heating medium, a temperature sensor 32 is installed outside the heating tube 10 to control the temperature of the heating wire 11 by controlling the electric power applied to the heating wire 11 by the controller 30 in the event of overheating.

However, the heating temperature of the heating wire can be heated to a temperature of 100 degrees Celsius or more, and at such a temperature, the heating medium is not liquid and causes gas evaporation, and the pressure inside the heating pipe increases, May be damaged.

Therefore, in the conventional heat transfer pipe, separate temperature sensors are installed to prevent the heating medium from vaporizing, and a separate level control unit is provided for absorbing the volume expansion of the heating medium or the heating medium.

However, when the temperature sensor or the controller is operated abnormally, the problem of overheating may continue to occur. To this end, an additional separate pressure regulator is required as disclosed in Korean Patent Registration No. 10-0805702.

Korean Patent Registration No. 10-0805702 (Notice of February 20, 2008)

An object of the present invention is to provide an electrothermal heating pipe which can be safely and simply heated by a heating element and can be heated through a heating medium without overheating.

It is another object of the present invention to provide an electrothermal heating pipe capable of preventing a heating medium from undergoing a phase change to a gas by overheating, increasing a pressure inside the heating pipe, and being simple in structure and facilitating construction.

In order to accomplish the above object, according to the present invention, there is provided an electrothermal heating pipe including a heating pipe, an electric heater inserted into the heating pipe, and a heat exchanger disposed inside the heating pipe to transfer heat radiated from the electric heater to the outside of the heating pipe. A heating medium to be charged; A bimetallic temperature switch is further provided in the heating pipe to shut off the power applied to the heating element when the heating medium is over a predetermined temperature and to shut off the power applied to the heating element when the heating medium is below a predetermined temperature .

The bimetallic temperature switch is connected in series to a power source applied to the heating element, and switches the power application of the heating element according to the temperature of the heating medium.

The heating medium is a heating medium in a liquid state, and conveys heat of the heating element to the heating tube to heat the heating element.

Also, the heating tube can be curved with flexibility to be freely formed and shaped, and the heating element can be arranged to be traversed into the tube or superimposed two or more times to facilitate the heat generating function, Water or oil.

The bimetallic temperature switch is selected for each temperature according to the heating medium, and is sealed in the tube together with the heating medium.

The bimetallic temperature switch may further include a protection member spaced apart from the bimetallic temperature switch such that the bimetallic temperature switch does not contact the heating element.

The thermo-heating pipe according to the present invention having the above-described structure controls the upper temperature limit such that the heating medium does not rise above a predetermined temperature by using the bimetal temperature switch. In addition, the liquid heating medium is prevented from becoming a gas, thereby preventing breakage of the heating pipe. Since the bimetallic temperature switch is structurally not damaged by external influences, it is possible to prevent damage to the heating pipe in a safe and simple manner.

Further, in the heat transfer heating pipe according to the present invention, the bimetallic temperature switch is connected in series with the heating wire, and the bimetal temperature switch is placed in the heating medium in the heating medium to seal the outer heating pad. .

Further, if the heating pipe of the present invention is made of a transparent or translucent material, it is possible to easily confirm whether the bimetallic temperature switch is installed, thereby making it possible to make the heating system safely.

Further, by using the heat transfer pipe according to the present invention and additionally using a safety device, a more reliable and safe heating system can be used.

FIG. 1 is a plan view schematically showing a floor heating system using a general electrothermal heating pipe.
2 is a cross-sectional view schematically showing an electric wiring and a heating wire of a conventional heat transfer heating pipe in cross section.
3 is a cross-sectional view showing an embodiment of the heat transfer heating pipe of the present invention.
4 is a cross-sectional view showing another embodiment of the heat transfer heating pipe of the present invention.
Fig. 5 is a front view (a) and a sectional view (b) showing a protective member for separating the bimetallic temperature switch from the heating element.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements throughout the drawings, unless they are indicated on other drawings.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a heat transfer pipe according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing a schematic configuration of an embodiment of the heat transfer heating pipe according to the present invention. The heat transfer heating pipe 100 of the present invention includes a heating pipe 10, an electric heater 110, (120), a heating medium (130), and a bimetallic temperature switch (140).

The heat transfer pipe according to the present invention is different from the conventional hot water pipe using electricity in that the bimetallic temperature switch 140 is embedded in the heating pipe, and the remaining components can be applied equally or similarly.

The heating element 110 is heated in the heating tube 10 to efficiently heat the heating element 110 through the heating tube 10, 10, the heating medium 130 is filled by the sealing portions 120 on both sides. The heat conductor 110 is connected at both sides with a wire 310 extending from the controller through the sealing portion 120 for external power supply.

The heating pipe (10) of the heat transfer heating pipe of the present invention is generally applicable to pipes and pipes used for heating. That is, it is possible to use a plastic-based tube such as an Excel tube, or a metal-based tube such as a copper alloy, aluminum or stainless steel tube. In other words, it is possible to use all the tubes that can receive heating medium and heat transfer material inside the tube. Preferably, however, the tube of the present invention is a plastic-type tube such as an Excel tube, which seals a liquid such as hot water, is suitable for floor heating, and is flexible and easy to install.

The heat transfer body 110 of the heat transfer heating pipe of the present invention can be any heat transfer cable that can be used in the heating medium 130. The heat transfer body 110 can be made of a nichrome wire or other general heating wire commonly used in hot water heat transfer tubes, And aluminum electrothermal cable may be used. Depending on the application and installation method of the heating pipe, it is sufficient to use an appropriate heating element such as a heating wire or an electric heating cable.

The sealing portion 120 of the heat transfer heating pipe of the present invention prevents the heating medium 130 filled in the heating pipe 10 from leaking out of the heating pipe 10, To prevent short circuit. The sealing portion 120 can be used in the same manner as the conventional sealing portion. That is, by using silicon or other various materials, it is necessary to seal the heating medium to prevent the heating medium from leaking while allowing the electric wires or the heating element to penetrate in consideration of the characteristics of the heating pipe. In the embodiment of FIG. 3, the heat conductor 110 is connected to the electric wire 310 at the connection portion 121 and extends to the heating pipe 10 through the sealing portion 120. The sealing part 120 prevents the heating medium 130 from leaking out of the heating pipe 10 and the sealing part 120 is fixed to the heating pipe 10 . Here, the sealing part 120 including the fixture 122 and the connection part 121 may be variously modified as needed so long as it can fulfill its role.

The heating medium 130 of the present invention serves to transmit the heat of the heating element 110 to the outside through the heating tube 10, and a solid or liquid type medium is mainly used. However, it is possible to use any medium that can be accommodated in a heating pipe and transmit heat well. However, in order to prevent an increase in pressure due to overheating prevention, which is an important feature of the present invention, it is preferable in the case of a liquid heating medium such as water or oil.

 The bimetallic temperature switch (140) of the present invention uses bimetal as an important feature in the present invention. A bimetal is formed by superimposing two kinds of thin metals with different degrees of expansion and contraction according to a thermal expansion coefficient, that is, a change in temperature. When the temperature is increased, the larger the coefficient of thermal expansion, the more the bimetal is bent and the opposite direction. And when the temperature drops again, it returns to its original state. The metal which can not be inflated is made of nickel (Ni) and iron (Fe) alloy. The metal that can be expanded is nickel, manganese, iron alloy, nickel molybdenum iron alloy, There are many kinds of alloys such as Nissan and Copper. The bimetallic temperature switch 140 functions as a switch according to the temperature by using the bending property according to the temperature. The bimetal temperature switch 140 controls whether or not the power is applied by using the bimetal itself as a switch. When the temperature of the bimetal temperature switch 140 is above a predetermined temperature, the power supply connected to the heating element is cut off, and when the temperature is lowered to a predetermined temperature or lower, the power is again applied. It is a safe temperature switch that operates by sensing the temperature alone and is less likely to operate abnormally due to external influences. The bimetallic temperature switch 140 is typically embedded in the heating tube 10 in the form of a rectangular parallelepiped or a thin cylindrical body and contacts the heating medium 130 to control whether the heating element 110 is powered or not according to the temperature. The bimetallic temperature switch 140 is preferably operated in response to the temperature of the heating medium 130 without directly contacting the heating element 110. [ It is preferable that a small bimetallic temperature switch of a rectangular parallelepiped shape is brought close to the heating tube 10 by using the sealing portion 120 so as not to come into contact with the heat conductive member 110. If necessary, the bimetallic temperature switch 140 and the heat conductive member 110 may not be in contact with each other.

The bimetallic temperature switch 140 is preferably disposed in contact with the heating medium in the heating pipe to operate according to the temperature of the heating medium. The bimetallic temperature switch 140 may be operated according to the temperature of the heating medium, It is sufficient to route the power to the heat conductor to cut off or connect the power. 3, the bimetallic temperature switch 140 is disposed within the heating tube 10 and the connection line of the bimetallic temperature switch 140 passes through the sealing portion 120 to the outside of the heating tube 10, One is connected in series.

1, when the external heat source is applied to the heat transfer body 110 through the electric wire 310, the heat transfer body 110 generates heat and the heat transfer body 130 is heated And the heated heating medium 130 discharges heat to the outside of the heating pipe 10. [ When the heating medium 130 is heated to a predetermined temperature or higher, the bimetallic temperature switch 140 cuts off the power applied to the heating element 110 to block the heating medium from being heated to a predetermined temperature or higher. When the temperature of the heating medium 130 drops below a predetermined temperature, the bimetal of the bimetallic temperature switch 140 is connected to the electric heating element 110 so that the power can be connected to the electric heating element 110, The body 110 can be heated. That is, the bimetallic temperature switch 140 directly controls the power supply of the heating element 110 according to the temperature change of the heating medium 130, thereby controlling the heating of the heating medium 130.

Thus, the bimetallic temperature switch of the present invention prevents the heating medium from being overheated. Therefore, the heating medium, such as water or a heating medium for heating, evaporates when it is heated to a temperature higher than a predetermined vapor phase temperature, so that the heating medium expands in the heating pipe, thereby increasing the pressure in the heating pipe and damaging the heating pipe. If the heating pipe is broken and the heating medium leaks out like this, the high temperature heating medium will not only be dangerous but also cause the problem of the heating itself. In the case of using a liquid heating medium of water or oil, when the operating temperature of the bimetallic temperature switch 140 is set lower than the boiling point of the heating medium, the heating medium pipe of the present invention prevents the heating medium from becoming a gas, It is possible to prevent the pipe from being damaged or the pressure inside the heating pipe to increase, and to use the heating pipe safely. Of course, a temperature sensor or other safety device can be used as needed, but the bimetallic temperature switch 140 is embedded in the heating pipe to ensure safety basically. In particular, in the case of using the heating system of FIG. 1, when the heat-transfer heating pipe of the present invention is manufactured by being sealed with a heating medium, an electric heat element, and a bimetallic temperature switch built therein, Immediate placement and setting on the floor will create a heating system.

In particular, if the heating pipe is made of transparent or semitransparent material, it is possible to make the heating system more secure by checking the presence of the bimetallic temperature switch.

3, the heat transfer heating pipe 100 of the present invention includes a heating pipe 10, a heat transfer body 110, A sealing portion 120, a heating medium 130, and a bimetallic temperature switch 140. 3 is that the heating element 110 crosses the heating pipe 10 and is connected to the electric wire 310 at one side without being connected at both sides with the electric wire 310 at the outside. That is, one side of the heating pipe is closed and the heating element 110 is reciprocated and connected to the external electric wire 310 only from one side of the heating pipe 10. The embodiment of FIG. 4 is only a difference according to the arrangement of the heaters 110, and the arrangement of the bimetallic temperature switch 140 of the present invention is the same.

5 is a front view and a top cross-sectional view showing the protection 190 of the bimetallic temperature switch 140. FIG.

The bimetal temperature switch 140 may be in contact with the heating medium without contact with the heating element, so that the bimetal temperature switch 140 may be embedded in the heating tube.

The protector 190 has a large area fixing part 195 in contact with the tube to prevent the rotation of the tube 190. The protector 190 has a through hole formed at one side or at the center so that one or two lines can pass through the tube. A connection hole 192 for connecting the bimetallic temperature switch located apart from the wiring hole 191 so that the heat transfer member and the bimetallic temperature switch can be fixed and separated from each other, 130 are provided with a plurality of through holes 193 so that they can move freely and are disposed close to the sealing portion in the heating pipe. If the bimetallic temperature switch is directly fixed to the coupling hole, the wiring hole is formed as one fixing hole, and if the bimetallic temperature switch is directly fixed to the coupling hole, Suffice. If the wiring lead for the bimetallic temperature switch 140 is inserted into the coupling hole or the wiring is passed, the through hole and the fixing hole can be formed. When the bimetallic temperature switch 140 is fixed, it is preferable that the bimetallic temperature switch 140 can be in contact with the heating medium. The protective cover may also be modified and used in various ways to suit its role.

100 - Electric heating pipe 10 - Heating pipe
110 - heater 120 - sealing part
130 - Heat medium 140 - Bimetal temperature switch

Claims (6)

And a heating medium which is filled in the heating tube to transmit heat radiated from the heating element to the outside of the heating tube,
And a bimetallic temperature switch disposed in the heating pipe so as to be in contact with the heating medium,
The heating medium is a heating medium in a liquid state, and conveys the heat of the heating element to the heating tube,
Wherein the bimetal temperature switch comprises:
Wherein the heating medium is selected to operate at a predetermined temperature or lower depending on the type of the heating medium,
Is disposed so as not to be in contact with the heat transfer body and is sealed in the heat transfer tube together with the heat transfer body, and
Connected in series to a power source applied to the heating element, switching power application of the heating element according to the temperature of the heating element, and
The power source applied to the heat transfer member is cut off when the heating medium in the liquid state exceeds a predetermined temperature below the evaporation temperature of the heating medium and the power applied to the heat transfer member is not cut off when the heating medium is below a predetermined temperature, Preventing the heating medium from evaporating,
Wherein the heat transfer pipe has an inner surface.
delete delete The method according to claim 1,
The heating tube can be bent to have a flexibility by which it can be freely bent and formed, and the heating element can be traversed into the tube or overlapped more than twice, so that the heating function can be smoothly performed.
The heating medium is water or oil, and
It is embedded in the floor and used for heating,
Wherein the heat transfer pipe has an inner surface.
delete The method according to claim 1 or 4,
Further comprising a protector for isolating the bimetallic temperature switch from the bimetallic temperature switch so that the bimetallic temperature switch is separated from the bimetallic temperature switch.

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