JP2010027315A - Connection structure of sheathed heater and lead wire, and sheathed heater unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an inexpensive sheathed heater unit which is free from a failure such as electric leakage and has superior workability as well as obtaining a connecting structure having high watertightness at a connection part between the sheathed heater and a lead wire. <P>SOLUTION: The connection part between the sheathed heater and the lead wire is formed by inserting a terminal part of the sheathed heater and the lead wire into a cylindrical crimping sleeve having an insulating wall in the center of the interior thereof, by crimping the crimping sleeve, and then by connecting the terminal part of the sheathed heater and the lead wire to each other, heat-shrinkable tubes are triply wound around the outer periphery of the crimping sleeve for covering, the triply wound heat-shrinkable tubes are subjected to heat treatment to bring them into close contact with the terminal part of the sheathed heater and the lead wire, and furthermore, the connection part is housed in a metal tube and connected. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  TECHNICAL FIELD The present invention relates to a sheathed heater unit that is used by being embedded in a concrete layer such as under the floor of a house, or used as a heating element for floor heating, and a sheathed heater-lead wire connecting structure and a sheathed sheath having the connecting structure. It relates to the heater unit.

  Conventionally, for heating of a house or the like, a heat storage body made of concrete or the like is provided in a space under the floor of a house or the like, a heating element that generates heat when energized is embedded in the heat storage body, and the heat from the heating element is stored in the heat storage body. After that, heat is released from the heat storage body. And it is very effective in terms of workability, efficiency, and cost to use a unit obtained by connecting a plurality of sheathed heaters as the heating element.

  This sheathed heater unit has a plurality of sheathed heaters, and ends of the sheathed heaters are connected by conductive wires, and both ends of the connected sheathed heaters are connected to a lead wire on the power source side. In addition, the sheathed heater inserts a heating wire such as nichrome wire into a metal pipe such as stainless steel, fills the metal pipe with an insulating material such as magnesia, and seals the end of the metal pipe with an insulating rubber or the like. And the side surface of the metal pipe is further covered with a coating material such as resin.

However, in such a sheathed heater unit, there is a problem that a connection portion between each sheathed heater and the conductive wire or a connection portion between the lead wires is leaked and fails. In particular, in the case of using it embedded in concrete, once it fails, there is a problem that it is difficult to repair and the cost is high.
JP-A-10-241845

  Therefore, the present invention obtains a joint structure that sufficiently secures water-tightness in the connection portion between the sheathed heater and the conductive wire and the connection portion between the sheathed heater and the lead portion in the sheathed heater unit, and has this connection structure. Therefore, an object of the present invention is to provide a sheathed heater unit having a long service life that is less likely to cause a failure due to electric leakage even if embedded in concrete.

  In order to solve the above-described problems, the sheathed heater and lead wire connection structure of the present invention is crimped by inserting the terminal rod and lead wire of the sheathed heater into a crimping sleeve that is cylindrical and has a blocking wall in the center of the inside. In addition to being connected, the outer periphery of the crimp sleeve is covered with a heat-shrinkable tube and adhered by heat treatment, and the connecting portion is housed in a protective tube.

  The sheathed heater unit of the present invention is a sheathed heater unit in which a plurality of sheathed heaters are connected by a conductive wire, and has a connecting structure of the sheathed heater and a lead wire and a connecting structure of the sheathed heater and the conductive wire. It is characterized by being.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to obtain the sheathed heater unit which can ensure water-tightness enough and can prevent failures, such as disconnection of a sheathed heater, at low cost. Therefore, the sheathed heater unit of the present invention can be used as a heating element embedded in a heat storage layer made of concrete provided under the floor of a house or the like.

  FIG. 1 is a cross-sectional view showing a connection structure between a sheathed heater terminal portion and a lead wire according to the present invention, and FIG. 2 is a view showing a connection portion between a terminal rod of the sheathed heater and a lead wire terminal portion. FIG. 4 is a sectional view showing a connection structure of each sheathed heater terminal portion, and FIG. 4 is a perspective view showing a sheathed heater unit according to the present invention.

  As shown in FIG. 1, the sheathed heater 2 according to the present invention has a coil-shaped heating wire 6 having terminal rods 22 at both ends inserted into a metal pipe 7, and the inside of the metal pipe 7 is made of magnesia powder. Filled with insulating powder, both ends of the metal pipe 7 are sealed with a sealing material 23 made of silicon to maintain insulation in the metal pipe 7, and the terminal rod 22 is exposed to the outside of the metal pipe 7. .

  As shown in FIGS. 1 and 2, the connecting portion between the sheathed heater 2 and the lead wire 1 is cylindrical, and is connected to the terminal rod 22 of the sheathed heater 2 in the crimping sleeve 4 having a blocking wall 5 at the center of the inside. The lead wire terminal portion 21 is inserted, and the crimp sleeve 4 is connected by crimping, and the periphery of the crimp sleeve 4 is covered with the heat-shrinkable tubes 11, 12, and 13 in a three-fold manner to provide a cylindrical protection The connection structure of the present invention is configured by being accommodated in the tube 9.

  The crimp sleeve 4 is preferably made of copper and has a blocking wall 5 at the center of the inside thereof. The blocking wall 5 can block water intrusion due to capillary phenomenon from the lead wire side, and as a result, it is possible to prevent failures such as leakage while maintaining the connection strength between the sheathed heater and the lead wire. Become.

  Since the heat-shrinkable tubes 11, 12, and 13 are shrunk when heat is applied, by applying heat with a dryer or the like, the sheathed heater including the connecting part and the lead wire can be brought into close contact with each other. Watertightness can be sufficiently secured. In addition, in order to ensure water tightness, you may coat | cover a heat shrinkable tube 3 or more times.

  Since the connection part connected as mentioned above is accommodated in the cylindrical protective tube 9, it can acquire sufficient intensity | strength with respect to the pressure from the outside. The protective tube 9 is preferably made of metal from the viewpoint of strength, but may be made of resin as long as it has strength.

  As shown in FIG. 3, the connecting portion of the sheathed heater 2 and the conductive wire 3 connects the terminal rod 24 of the sheathed heater 2 and the end of the conductive wire 3 through the connecting member 10 and is connected by welding. The connection structure of the present invention is configured by covering the outer periphery with the heat-shrinkable tubes 14, 15, 16 in a triple manner, closely adhering them by heat treatment, and housing them in a cylindrical protective tube 25. Even with such a connection structure, the internal water tightness can be sufficiently secured.

  FIG. 4 is a plan view of a sheathed heater unit according to the present invention, in which a plurality of sheathed heaters 2 are connected by a conductive wire 3, and both ends of the connected sheathed heater are connected to a lead wire 1 connected to a power source. Each is connected to form a sheathed heater unit. The sheathed heater and the conductive wire, and the sheathed heater and the lead wire are connected by the above connection structure, respectively. For this reason, since any connection part can ensure sufficient water-tightness, there is no failure due to electric leakage, and a highly durable sheathed heater unit can be obtained.

It is sectional drawing which shows the connection part of the sheathed heater and lead wire which concern on this invention. It is sectional drawing which shows the connection part of the terminal rod of a sheathed heater, and the terminal part of a lead wire. It is sectional drawing which shows the connection part of a sheathed heater and a conductive wire. It is a top view which shows the sheathed heater unit which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead wire 2 Seed heater 3 Conductive wire 4 Crimp sleeve 5 Barrier wall 6 Heating wire 7 Metal pipe 9, 25 Protective tube 10 Connection member 11-16 Heat contraction tube 21 Terminal part 22, 24 Terminal bar 23 Sealing material

Claims (2)

  A sheathed heater terminal and a lead wire are inserted into a crimping sleeve that is cylindrical and has a blocking wall in the center, and crimped and connected, and the outer periphery of the crimping sleeve is covered with a heat-shrinkable tube and adhered by heat treatment. Furthermore, the connection structure of the sheathed heater and the lead wire, wherein the connecting portion is housed in a protective tube.   A sheathed heater unit in which a plurality of sheathed heaters are connected by a conductive wire, wherein the sheathed heater unit has the connection structure according to claim 1 at a connecting portion between the sheathed heater and a lead wire.