JPS5981432A - Space heater - Google Patents

Abstract

PURPOSE:To offer a heater which is capable of selecting various materials and various structure as components for a heating device, by so constituting that a heating device such as sheathed heater can be replaced easily when it is damaged, soldering of the heating device is unnecessary, through which the heating device is not spoiled through heat to be generated at the time of soldering, and generation of thermal stress resulting from restriction of the heating device can be controlled further. CONSTITUTION:An auxiliary pipe 7 is arranged above a main pipe 6 which function as a fin tube and both ends of the pipe 7 are connected with the main pipe 6 through connecting pipes 8. A large number of fins 9 is provided on the external circumferences of the main pipe 6 and the auxiliary pipe 7. Both ends of the main pipe 6 and the auxiliary pipe 7 are provided with end caps 10, 11 and a closed circuit which is kept in a vacuum state is formed by the main pipe 6, the auxiliary pipe 7 and the connecting pipes 8. An operating fluid such as water, ammonia or flon is enclosed within the closed circuit to the extent about to fill up the main pipe 6 or less than that. A header pipe 12 penetrates through the inside of the main pipe 6 both ends of which penetrating through the end cap 10 are secured to the end cap 10. A sheathed heater 13 which functions as a heating device is inserted detachably within the header pipe 12.

Description

[Detailed description of the invention] This invention relates to a natural convection type heater.

Conventionally, as this type of heater, one shown in FIG. 1 has been used. That is, by filling the working fluid in the fin tubes 2 and 3, which have a large number of radiation fins 1 on the outer periphery and are arranged laterally, and by heating this working fluid with the sheathed heater 4 and circulating the working fluid, Heat is extracted from the radiation fins 1.

In this heater, when incorporating the sheathed heater 4,
End caps 5 attached to both ends of fin tube 2
An opening having the same or a slight clearance as the outer diameter of the sheathed heater 4 is provided, and the end cap 5 and the sheathed heater 4 are directly brazed. For this reason, the following problems occurred.

i) If the sheathed heater 4 is damaged, it cannot be replaced.

ii) Since the sheathed heater 4 is heated to a high temperature during brazing, dielectric breakdown of the sheathed heater 4 may occur, potentially damaging the sheathed heater 4.

iii) When the heating device is operated, a bear cycle is applied to the sheathed heater 4, and Fl force is generated by the expansion and contraction of the sheathed heater 4 due to heat. However, the sheathed heater 4
Since both ends are fixed to the end cap 5 by machining, the thermal stress is further increased due to the difference in thermal expansion between the fin tube 2 and the sheathed heater 4.

vi) If the outer shell of the sheathed heater 4 is damaged because the sheathed heater 4 comes into contact with the working fluid in the radiator, the working fluid will penetrate into the insulator such as magnesium oxide of the sheathed heater 4, and the insulation will be destroyed. . Furthermore, if the fin tube 2 is of a heat pipe type, the vacuum will be destroyed.

Therefore, it is an object of the present invention to easily replace a heating means such as a sheathed heater when it is damaged, and also to avoid the need for brazing the heating means so that the heating means will not be damaged by the heat of time. To provide a heater capable of suppressing the generation of heating force due to restriction of a heating means, and in which various materials and structures can be selected for the heating means.

An embodiment of this invention is shown in FIGS. 2 to 5. This example is an example of a heat pipe configuration.

In the figure, 6 is a main pipe serving as a fin tube, which is installed approximately horizontally. A sub-pipe 7 is arranged above the main pipe 6, and both ends communicate with the main pipe 6 through a connecting pipe 8. A large number of fins 9 are provided on the outer periphery of the main pipe 6 and the sub pipe 7. End caps 1 are installed on both ends of the main pipe 6 and the sub pipe 7.
0.11, and the main pipe 6, sub-pipe 7, and connecting pipe 8 form a closed circuit maintained in a vacuum. In this closed circuit, there is enough water to approximately fill the main pipe 6 or a smaller amount.
A working fluid such as ammonia or Freon is sealed. A header pipe 12 passes through the main pipe 6.
Both ends thereof pass through the end cap 1o and are fixed to the end cap 10.

Inside the header pipe 12 is a sheathed heater 1 serving as a heating means.
3 (Fig. 5) is removably inserted.

In Fig. 3, 14 is an ejection pipe;
This is the opening for vacuum suction and injection of hydraulic fluid in the closed circuit. The assembly consisting of the main pipe 6, sub-pipe 7, etc. has an air intake port 15 at the bottom. It is housed in a casing 17 which has an air outlet 16 at the top.

Next, the operation of this heater will be explained. sheathed heater 1
When electricity is applied to 3, the working fluid is heated, whereby the evaporated working fluid moves to the sub pipe 7 via the connecting pipe 8, releases latent heat in the sub pipe 7, condenses, and falls to the main pipe 6 by gravity. This circulation is repeated and heat is transported from the main pipe 6 to the sub pipe 7 via the connecting pipe 8 at a high speed. As a result, the six main pipes 8 and the sub pipes 7 are heated at approximately equal temperature, and the heat is radiated from the fins 9.

Although the operation is performed in this manner, since the header pipe 12 is passed through the main pipe 6 and the sheathed heater 13 is inserted therein, the following advantages can be obtained.

i) If the sheathed heater 13 is damaged, it can be easily replaced. ii) Since brazing of the sheathed heater 13 is unnecessary, there is no risk of damaging the sheathed heater 13 due to the heat of brazing. i
ii) Since it does not come into direct contact with the working fluid, the material of the sheathed heater 13 can be selected arbitrarily. iv) Since it is not necessary to firmly fix the sheathed heater 13 when installing it, the heating force for expansion and contraction of the sheathed heater 13 due to thermal cycles can be minimized. (2) A heating means other than the sheathed heater 13, such as hot water, can be selected.

Although the above embodiment was applied to a heat pipe type device, the present invention can also be applied to a hydraulic fluid circulation type device similar to the example shown in FIG. In addition, 1 which is not divided into main pipe and sub pipe
It can also be applied to fin tube type books. Further, in the above embodiment, only one header pipe 12 is provided, but a plurality of header pipes may be provided as shown in FIG.

As described above, the heater of the present invention includes a fin tube that has end caps at both ends, has fins on the outer peripheral surface, and seals a working fluid, and a fin tube that penetrates the fin tube and connects to both ends or the end caps. Since it is equipped with a fixed header pipe and a heating means provided within the header pipe, it can be easily replaced if the heating means such as a sheathed heater is damaged, and there is no need to braze the heating means. The heating means will not be damaged by the heat during brazing. Furthermore, it is not necessary to firmly fix the heating means, the generation of heat and force can be suppressed, and various materials and configurations can be selected for the heating means.

[Brief Description of the Drawings] Fig. 1 is a perspective view of a conventional example, Fig. 2 is a cutaway perspective view of an embodiment of the present invention, Fig. 3 is an enlarged front view of the casing removed, and Fig. 4 is a perspective view of a conventional example. The figure is an enlarged side view, FIG. 5 is an enlarged perspective view, and FIG. 6 is a front view of the end cap in another example of the IE.

Claims (1)

[Claims] A hydraulic fluid having end caps at both ends and fins on the outer circumferential surface; a fin tube inserted therein; a header pipe passing through the fin tube and having both ends fixed to the end caps; A heater comprising a heating means provided in the.