JPS6224166Y2 - - Google Patents

Description

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

Conventionally, as this type of heating device, one shown in FIG. 1 has been proposed. That is, a finch tube 2 having a large number of heat dissipating fins 1 on the outer periphery and running in the horizontal direction is filled with working fluid, and this working fluid is heated by a sheathed heater 3, and by circulating the working fluid, heat is released from the heat dissipating fins 1. This is to extract the . The heat dissipation fin 1 warms the air that enters from the inlet of an exterior case (not shown), and warms the room temperature with warm air blown out from the outlet. However, with this configuration in which the working fluid is circulated as a liquid, the heat capacity of the working fluid is large when the heater is started, and the circulation speed of the working fluid is slow, so it takes until the radiator reaches a steady temperature. It took about 30 minutes. Additionally, since the hydraulic fluid is circulated, the temperature of the hydraulic fluid differs by approximately 20 degrees Celsius between the beginning and end of the circulation, making it impossible to produce uniformly warm air.

To solve these problems, a system has been proposed in which the working fluid is evaporated and circulated (Japanese Patent Application Laid-open No. 45041/1983). That is,
A main pipe in which a heating medium is sealed and a heater is provided is connected to a sub-pipe having fins through a single continuous pipe, and the evaporated heat medium is sent to the sub-pipe to heat the air flow in the sub-pipe.

However, since there is only one pipe that connects the main pipe and the sub pipe, the evaporated gas of the working fluid that is warmed in the main pipe and rises to the sub pipe side, and the condensed working fluid or low temperature that cools and descends in the sub pipe. There is a problem that interference with gas occurs, resulting in poor circulation efficiency and reduced thermal efficiency. Further, only the sub pipe is provided with fins, and the main pipe is not provided with fins. Therefore, there is a problem that a sufficient effective area of the fins for heating the airflow is not obtained, resulting in poor airflow heating efficiency. Note that even if the area of the fins of the sub-pipe is increased, the fins do not work effectively in areas far away from the sub-pipe, and simply increasing the area of the fins has a limit to the improvement in airflow heating efficiency.

The purpose of this invention is to provide a heater that has good thermal efficiency, can quickly raise the temperature to a steady temperature at startup, and can provide uniform hot air with no temperature unevenness.

An embodiment of this invention is shown in FIGS. 2 to 6. In the figure, reference numeral 5 denotes a hollow main pipe arranged substantially horizontally, which is filled with a working fluid such as water, ammonia, or fluorocarbon, and has a sheathed heater 6 built therein so as to be immersed in the working fluid. A hollow sub-pipe 7 is disposed above the main pipe 5, and both ends communicate with the main pipe 5 through connecting pipes 8 to form a closed circuit. This closed circuit is maintained under vacuum. A large number of fins 10 are provided on the outer surfaces of the main pipe 5 and the sub pipe 7.
The assembly consisting of the main pipe 5 and the sub-pipe 7 is housed in a casing 13 having an air intake port 11 at the bottom and an air outlet 12 at the top. In Figure 5,
14 is an end cap, 15 is a thermostat,
16 is an edge extension pipe.

Next, the operation of this heater will be explained. When the sheathed heater 6 is energized, the working fluid is heated, and the evaporated working fluid moves to the sub pipe 7 via the connecting pipe 8. The evaporated gas of the working fluid that has moved to the sub pipe 7 releases latent heat in the sub pipe 7, condenses, and falls to the main pipe 5 by gravity. This circulation is repeated, and the heat is transported from the main pipe 5 to the sub pipe 7 via the connecting pipe 8 at a high speed. As a result, the main pipe 5 to the continuous pipe 8 and the sub pipe 7 are heated to a substantially uniform temperature, and the heat is radiated from the fins 10. And the suction port 11 at the bottom of the casing 13
The air that has entered through the main pipe 5, sub pipe 7 and connecting pipe 8
The air is heated by the air and discharged into the room from the air outlet 12. The heated air circulates indoors and heats the room.

In this way, due to the heat pipe principle, heat circulation by the working fluid within the main pipe 5 and the sub pipe 7 is performed at high speed immediately after electricity is applied. As a result, it has excellent heating speed and reaches a steady state in half the time compared to conventional systems that circulate the working fluid as a liquid. Moreover, since the temperature inside the main pipe 5 and the sub-pipe 7 becomes substantially uniform, hot air with extremely little temperature unevenness can be obtained.
Moreover, since the main pipe 5 and the sub-pipe 7 are communicated with each other by a connecting pipe 8, and two connecting pipes 8 are provided, compared to the conventional example in which only one connecting pipe is provided, the evaporated gas of the working fluid is There are advantages in that it is easy to send the liquid to the sub pipe 7 side, and the working fluid condensed in the sub pipe 7 is easy to return to the main pipe. Therefore, the sub pipe 7 is heated uniformly. In addition, since the fins 10 are provided on both the main pipe 5 and the sub pipe 7, even though each fin 10 attached to the main pipe 5 and the sub pipe 7 has a small area, the fins 10 as a whole
A large effective area can be obtained. Therefore, air flow heating efficiency is excellent. Furthermore, the sub pipe 7 is connected to the main pipe 5.
The fins 10 of the main pipe 5
The air warmed by the fin 10 of the secondary pipe 7 rises and
This means that the heat is reheated, which means that the heat efficiency is good.

Incidentally, although a sheathed heater was used as the heater in the above embodiment, a pipe through which hot water passes may also be used as the heater.

As mentioned above, in the heater of this invention, the heat radiation means is configured as a heat pipe type with fins, so
The temperature rises quickly to the steady temperature at startup, and uniform hot air with no temperature unevenness can be obtained. In addition, both ends of the main pipe and the auxiliary pipe are connected by a continuous pipe, and since there are two continuous pipes, compared to the conventional example with one continuous pipe, the evaporated gas of the working fluid is reduced. It has the advantage that it is easy to send to the sub pipe side, and the working fluid condensed in the sub pipe is easy to return to the main pipe. Therefore, the sub pipe is heated evenly.

Moreover, since the fins are provided on both the main pipe and the sub pipe, even if each fin attached to each of the main pipe and sub pipe has a small area, a large effective area of the fins as a whole can be obtained. Therefore, air flow heating efficiency is excellent. Moreover, since the auxiliary pipe is placed above the main pipe, the air warmed by the fins of the main pipe rises and is warmed again by the fins of the auxiliary pipe, which also has the effect of improving thermal efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is a cutaway perspective view of an embodiment of the invention, Fig. 3 is a front view thereof, Fig. 4 is a cross-sectional side view thereof, and Figs.
The figures are an enlarged front view and a side view of the case taken out, respectively. 5... Main pipe, 6... Sheathed heater, 7... Sub pipe, 8... Connecting pipe, 10... Fin, 11... Inlet, 12... Outlet, 13... Casing.

Claims (1)

[Scope of utility model registration request] A main pipe filled with hydraulic fluid and installed approximately horizontally, and a sub-pipe located above the main pipe, both ends of which communicate with both ends of the main pipe via connecting pipes, forming a vacuum closed circuit with the main pipe. A heater comprising: a heater installed in the main pipe to evaporate the working fluid; and fins provided on the outer surfaces of the main pipe and the sub pipe.