JPH0127592Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a sheathed heater attached to a fan coil unit, other heat exchangers, heating machines, refrigerators, etc.

Conventionally, a sheathed heater is incorporated in the fan coil of a fan coil unit for heating and for defrosting when supercooled.

Sheathed heaters are either pipes with terminals protruding from both ends, or heater wires are passed through one end of the pipe and made a U-turn at the tip so that two terminals protrude from the same end of the pipe. .

In the case of a type in which the terminals 4 protrude from both ends of the pipe 1 as shown in Fig. 2, a rubber mold 7 is applied to cover the ends of the pipe after both ends are sealed to completely cut off the outside air. The mold is pipe 1
For the plate fin 9 of the fan coil unit shown in FIG. 3, the sheathed heater 10 must be installed on the side or top side of the plate fin 9 as shown by the chain line. , the heat generated by the heater cannot be effectively transmitted to the plate fins 9.

In addition, a sheathed heater with two terminals protruding from the same end of a pipe can be inserted seamlessly into the through hole 91 of the plate fin 9 because the tip of the pipe is closed and the entire length has the same diameter. . However, in this type of sheathed heater, the heating wire must be made a U-turn within the pipe without short-circuiting, so the pipe diameter has become large, and currently it is difficult to manufacture one with a diameter of 13 mm or less, and it is difficult to manufacture a small fan coil unit. It is unsuitable for use.

Although a small-diameter sheathed heater is naturally required for a small fan coil, due to the above-mentioned circumstances, there has been no one that can satisfy the problems of efficiency and miniaturization.

The technical problem to be solved by the present invention is to realize a small-diameter sheathed heater that can be used by being inserted into a plate fin hole.

In order to solve the above technical problem, the present invention forms a small diameter part at one or both ends of the pipe by drawing, and a rubber mold with an outer diameter that is the same as the pipe diameter or smaller than the pipe diameter is attached to the small diameter part. was applied.

Since at least one end of the above sheathed heater has a diameter that is the same as the pipe diameter or smaller than the pipe diameter, it can be used by inserting it into a through hole made in the plate fin according to the pipe diameter, and the contact area between the pipe and plate fin can be made close. The plate fins can be heated effectively.

Furthermore, since there is no need to make a U-turn in the heating wire within the pipe, it is possible to easily reduce the diameter.

The present invention will be specifically described below based on embodiments shown in the drawings.

As is well known, the sheathed heater 10 has a stainless steel pipe 1 filled with a heating wire 3 and magnesia 2, and a sealing material 5 such as silicone resin or gel resin at one or both ends of the pipe from which a terminal projects. An insulating tube 6 made of silicone resin pipe, polyfluorinated ethylene resin, etc. is fitted into the terminal 4 protruding from the pipe end, and the pipe end is reduced in diameter by drawing. The reduced diameter portion 11 of the pipe covers the insulating tube 6, and the sealing material 5 is hermetically sealed within the pipe 1.

A lead wire 8 is connected to the terminal 4, and a rubber mold 7 is applied so as to cover the small diameter portion 11 of the pipe 1 and the end of the lead wire 8.

As is well known, the rubber mold 7 is formed by covering the pipe 1 and the lead wire 8 with a rubber material, and then heating and pressurizing the rubber material with a mold to form the rubber material. The outer diameter of the pipe 1 is the same as the outer diameter of the pipe 1, or is formed to have a slightly smaller diameter.

However, the heater 1 is inserted into the sheathed heater through hole 91 that is formed in the plate fin 9 in accordance with the pipe diameter.
0, and a known cooling coil (not shown) is inserted into the cooling coil through hole 92. Since rubber molds 7 are applied to both ends of the pipe in close contact with the reduced diameter portion 11 of the pipe, the atmosphere in which the sheathed heater is used does not affect the inside of the pipe.

During cooling, the room is cooled by the cooling coil, and during cooling, frost adhering to the fins 9 is removed, and during heating, the sheathed heater generates heat.

The sheathed heater 10 fits into the through hole 91 of the plate fin 9 to increase the contact area with the fin 9, so that heat is effectively transferred to the fin 9, and the temperature of the sheathed heater eye does not rise excessively. It can extend the life of the heater.

Furthermore, since the sheathed heater of the present invention does not require a U-turn of the heating wire within the pipe, it can be easily manufactured even with a small pipe diameter of about 9 mm, for example.

Incidentally, the use of the sheathed heater of the present invention is not limited to fan coil units, and it goes without saying that it can be used for various purposes like a normal sheathed heater.

It should be noted that the present invention is not limited to the above-mentioned configuration, and it goes without saying that various modifications can be made within the technical scope of the claims of the utility model registration.

[Brief explanation of drawings]

FIG. 1 is an end sectional view of a sheathed heater, FIG. 2 is an end sectional view of a conventional example, and FIG. 3 is a side view of a plate fin. 1...Pipe, 11...Small diameter part, 7...Rubber mold.

Claims (1)

[Scope of utility model registration request] In a sheathed heater having a rubber mold 7 on the end, one end or both ends of the pipe 1 is reduced in diameter, and the reduced diameter part 11 is provided with a material whose outer diameter is the same as the outer diameter of the pipe or smaller than the outer diameter of the pipe. A sheathed heater in which a rubber mold 7 is placed in close contact with a reduced diameter portion 11 of the pipe, and a heating wire terminal 4 protrudes from the reduced diameter portion 11 of the pipe and is connected to a lead wire 8.