JPS61253788A - Electrically heating tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electric heating tube 1 that is laid on the floor of a room and used as a floor panel for heating.

[Related technologies and their problems] Heating devices that use radiant heat, such as radiant heaters, are equipped with a boiler and radiate heat through hot water through piping, so running costs and initial costs are high.
In addition, because the system radiates heat by forcibly circulating hot water heated by a boiler, heat exchanger, etc. through piping, there is a temperature difference between the inlet and outlet of the hot water, resulting in temperature unevenness.

In addition, in order to prevent such temperature unevenness, for example,
'S/157-18307 discloses a sheathed heater in which a heating wire is inserted into a metal tube filled with a heat-resistant insulator such as magnesia powder.

When the heating wire is energized, each part of this sheathed heater is heated evenly, but because the heat-resistant insulation covering the heating wire has extremely low thermal conductivity, the heat emitted by the heating wire is transferred to the metal tube. There are problems in that the rise in temperature of the metal tube is slow and the thermal efficiency is poor.

In order to solve this problem, Japanese Patent Application Laid-Open No.
Publication No. 1 discloses an electric heater in which a bare heating wire is disposed within a heat transfer casing filled with silicone oil having good thermal conductivity and insulating properties.

However, when this heat transfer casing is used on a floor panel arranged in a long meandering pattern, both ends of the heating wire are simply fixed to the terminals at both ends of the heat transfer casing, so the heating wire may become loose or the heat transfer casing may become loose. If a heavy object is placed on top of the heat transfer casing and the heat transfer casing is crushed, there is a risk of electrical leakage due to contact between the bare heating wires and the heat transfer casing. It is very dangerous to do so.

[Object of the invention] The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a heating tube that can be safely used as a floor panel without fear of electrical leakage from heating wires. .

[Structure of the Invention] The structure of the present invention for achieving the above object is to seal silicone oil in a metal tube having terminal portions formed with insulation at both ends,
A heating wire directly covered with a silicone rubber material is inserted into the metal tube, and both ends of the heating wire are connected to the terminal portion, respectively, to prevent electrical leakage due to direct contact between the metal tube and the heating wire. Defend.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the drawings, l represents a heat radiator, such as iron.

It is a metal tube made of copper, stainless steel, etc., and is filled with silicone oil 3 leaving a slight gap 2 inside, and both ends of the metal tube 1 are sealed with insulating seals M4.

Silicone oil 3 has excellent heat resistance, -60℃~300'
It can be stably used in a wide temperature range of about 0, and has excellent thermal oxidation resistance, electrical insulation properties, and as a heat medium.

A heating wire 6 directly covered with silicone rubber 5 is inserted into the metal tube 1 so as to be immersed in the silicone oil 3.
Both ends of this heating wire 6 are connected to a power extraction terminal portion 7 formed on the outside of the hermetic lid 4 through the hermetic lid 4.

As the silicone rubber 5, for example, silicone RTV rubber manufactured by Shin-Etsu Chemical Co., Ltd. can be used, and the thermal conductivity is 3.
It is a good electrically insulating material with a tensile strength of about 50 kg/am2 and a good tensile strength of about 8 X 1O-4 cal/cm-sec.degree. C. or more. Further, it is preferable that the silicone rubber 5 is the same type of silicone material as the silicone oil 3.

8 is a floorboard on which a long meandering metal tube l is placed, and 9 is a temperature control section connected to two terminal sections 7. This temperature control section 9 is equipped with a thermostat, and measures temperature changes in the heating wire 6 and directly or indirectly adjusts the current flowing through the heating wire 6 to maintain the heating wire 6 at a predetermined temperature. Adjuster 10
have. This temperature control section 9 can be connected to a commercial power source (not shown).

The present invention constructed as described above is a floor panel in which metal tubes 1 are arranged in a long meandering manner, and heating wires 6 covered with silicone rubber 5 are inserted into the metal tubes 1 filled with silicone oil 3. When the heating wire 6 is energized, the heating wire 6 generates heat and warms the metal tube 1 via the silicone rubber 5 and the silicone oil 3. At this time, electric heat & i6 is metal pipe 1
Since the floor panel is placed from end to end along the
Since the silicone oil 3 and the silicone rubber 5 interposed between the metal tube 1 and the heating wire 6 have high thermal conductivity, the heat generated by the heating wire 6 is directly and immediately conducted to the metal tube 1, and the temperature of the metal v1 is rapidly increased. , is efficiently conducted.

In addition, since the metal tube 1 is long and thin, if the heating wire 6 sags or the metal tube 1 is crushed, even if the metal tube 1 and the heating wire 6 try to come into contact, the electrically insulating silicone rubber 5 is coated to prevent direct contact and prevent electrical leakage. Note that the gap 2 takes into consideration the expansion of the silicone oil 3 when the temperature rises.

[Effects of the Invention] As described in detail above, according to the present invention, silicone oil is sealed in a metal tube having terminal portions formed with insulation at both ends, and a heating wire directly covered with a silicone rubber material is inserted into the metal tube. By inserting the heating wire and connecting both ends of the heating wire to the terminal portion, the metal tube and the heating wire do not come into direct contact with each other, thereby preventing risks such as electrical leakage, and providing a heating tube that can be used safely as a floor panel. . Furthermore, since both silicone oil and silicone rubber material have high thermal conductivity, the temperature rises quickly and heat is efficiently conducted, resulting in energy savings. Furthermore, since there is no fear of electrical leakage and the thermal efficiency is good, long electric heating tubes can be formed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an embodiment of the present invention, and FIG. 2 is a plan view thereof. 1.e Metal tube 3..Silicone oil 4..Airtight lid 5..Silicone rubber 6.-Heating wire
7...Terminal section

Claims (1)

[Scope of Claims] Silicone oil is sealed in a metal tube insulated at both ends to form terminal portions, a heating wire directly covered with a silicone rubber material is inserted into the metal tube, and both ends of the heating wire are connected to each other. An electric heating tube connected to the terminal portion.