JPH0463984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a heat exchanger, and more particularly, to a heat exchanger that ensures fluidity of a heat transfer liquid at the beginning of use and has a quick start-up.

(Prior Art) As shown in FIG. 3, the inventor of the present invention has discovered that ethylene glycol, triethylene glycol, etc. We proposed a heat exchanger in which a fluid with a high boiling point, low melting point, high viscosity, and low specific heat is sealed as a heat transfer liquid and is circulated intensively. The heat transfer liquid in this heat exchanger has a high boiling point, so it can be heated to a high temperature and is efficient, and has a low specific heat, so it rises quickly, but as the liquid temperature decreases, the viscosity increases and fluid resistance increases. growing.

For this reason, in heat exchange using ethylene glycol or the like as a heat medium, if the heat medium liquid is not being heated and the outside temperature has dropped and the fluidity of the heat medium liquid has deteriorated, then the heat source is turned on for use. Generally, circulation pumps that are driven at the same time as the heat source is turned on can become overloaded and have negative effects, so a circulation pump with a large discharge volume is required, but the circulation pump is not equipped with an overload protection circuit. This will work if there is. In addition, in this case, only the heat medium inside the heater is partially heated, and the heated heat medium liquid does not flow in the circulation pipe, so it may damage the heater or prevent the heater from being destroyed. Protective devices such as temperature fuses attached to heaters may be activated and stop the heat exchanger from operating.

Therefore, the inventor of the present invention has provided a preheating function to maintain the liquid temperature at a predetermined temperature and maintains the fluidity of the heat transfer liquid at all times, thereby preventing harmful effects on the heater and circulation pump at the beginning of use. He devised and filed an application for a heat exchanger that did not have any heat exchanger (Utility Model Publication No. 63-42257).

However, in this invention, a control circuit for controlling the preheating function and the reserve function is added to the conventional heat exchanger, which makes the device complicated and increases the cost.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a heat exchanger that does not adversely affect a heater or a circulation pump at the start of use and that starts up quickly even when using a heat transfer liquid such as ethylene glycol that has a high viscosity at a low temperature. With the goal.

(Means for Solving the Problems) The present invention has the following configuration to solve the above problems.

A circulation pipe is formed to circulate a heat medium liquid having a high viscosity at a low temperature, and in the circulation pipe, a heating section for heating the heat medium liquid, a circulation pump for forced circulation of the heat medium liquid, and a heat medium are provided. In a heat exchanger equipped with a heat radiating part that radiates heat from a liquid, the heating part has a box-shaped main body in which a heat transfer liquid is stored, a heat source arranged at the lower part of this main body, and a heat source arranged in the upper part of the main body. The circulation pump is provided with a heat medium liquid discharge port connected to the circulation pipe, and a heat medium liquid inflow port provided at a lower part of the main body and connected to the circulation pipe, and the circulation pump is connected to the heating section. In order to suck the heat medium liquid whose viscosity has been reduced by being heated by the heat transfer section and send it to the heat radiating section, the heating medium is interposed in a circulation pipe between the discharge port of the heating section and the heat radiating section.

(effect) Next, we will discuss the effect.

The high-temperature heat transfer liquid, which is heated by the heater and has low viscosity and good fluidity, is sucked by the circulation pump and sent to the heat radiation section, where it is smoothly circulated within the circulation pipe.
Further, the heat medium liquid that has radiated heat in the heat radiating section circulates through the circulation pipe and is returned from the inlet at the bottom of the heater.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

As in the conventional example, 10 is a heating section, 12 is a heat radiation section, and 14 is a circulation pump.

These heating section 10, circulation pump 14, and heat dissipation section 12 are connected in series through a pipe 18 to form one circulation pipe.
It is arranged so as to be adjacent to the suction port side of No. 4.

In addition, a fluid such as ethylene glycol, which has a high boiling point, a low melting point, and a small specific heat, and whose viscosity increases at low temperatures, is sealed in the circulation pipe as a heat medium liquid, and the fluid heated by the heating section 10 is heated. The medium liquid is sucked out and pressure-fed by the circulation pump 14, releases heat in the heat radiating section 12, and flows into the circulation pipe.

Next, the structure of the heating section 10 shown in FIGS. 2a and 2b will be explained.

The heating unit 10 shown in FIG. 2A has an electric heater 22 provided at the bottom of a box-shaped main body 20, and also has an inlet 20a for a heat medium liquid formed at the bottom of the main body 20. Further, a discharge port 20b for the heat medium liquid is formed in the upper part of the main body 20, and is connected to the suction port 14a side of the circulation pump 14 via a pipe 18a.

Further, a slight space 24 is formed in the upper part of the main body 20, and an air hole 20c is formed in the upper surface of the main body 20.
Even if the heating medium liquid expands due to heating, it is absorbed by the space 24, while the space 24 maintains atmospheric pressure by the air holes 20c.

The heater 10 in FIG. 2b has a main body 20, an electric heater 22, and an inlet 20a formed in the same manner as in FIG. 2a. On the other hand, the heat medium liquid discharge port 20b is formed at the uppermost end of the side surface of the main body 20, and is connected to the suction port 1 of the circulation pump 14 via the pipe 18a.
It is connected to the 4a side. In addition, the expansion chamber (not shown) may be located at an appropriate position in the circulation pipe or in the heating section 1.
0 is directly provided on the main body 20 of 0. Therefore, since there is no space above the main body 20, it is possible to sequentially take out the hot heat transfer liquid that has gathered at the top.

The present invention is configured as described above, and when used as floor heating, for example, the heat radiating section 12 is laid on the floor. In use, when the heat source is turned on, the heat medium liquid is heated by the electric heater 22 of the heating section 10, and the heated heat medium liquid rises to the upper part of the heating section 10 (downward from high temperature to low temperature). The heating medium liquid, which has been heated to a high temperature and whose viscosity has decreased and its fluidity has improved, is sequentially sucked out from the discharge port 20b of the heating section 10 by the circulation pump 14. Further, the heat medium liquid sucked out by the circulation pump 14 is pumped to the heat radiating section 12 to radiate heat, and the inlet 2 at the lower part of the heating section 10
It is returned into the heating section 10 from 0a.

Thereafter, the heat medium liquid circulates within the circulation pipe in the same manner.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and the structure of the heating section is not particularly limited. Although an electric heater was used for this purpose, this electric heater may be one based on dielectric heating or induction heating in addition to resistance heating, and furthermore, other heat sources such as gas kerosene may be used instead of electric heaters. Of course, many modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) The present invention is constructed as described above and has the following effects.

If the power is turned on when the outside temperature is low and the fluidity of the heat transfer fluid is poor, there will be a heat transfer fluid with low viscosity and good fluidity at the top of the heating section, and this low viscosity heat transfer fluid will be turned on. Since the circulation pump sequentially sucks out heat from the heating section and pumps it to the heat radiation section, there is no overload on the circulation pump.

Therefore, a pump with a smaller discharge amount can be used as the circulation pump than in the past, and costs can be kept low.

In addition, since a circulation pump is placed between the heating section and the heat dissipation section, it is possible to flow the heat medium liquid whose viscosity has decreased at the time of startup.
The start-up is extremely fast and a predetermined amount of circulation can be ensured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a circulation pipe of a heat exchanger showing a preferred embodiment of the present invention, Fig. 2 a and b are sectional views of each heating section, and Fig. 3 is a conventional circulation pipe of a heat exchanger. It is an explanatory view showing a pipe. 10... Heating section, 12... Heat radiation section, 14... Circulation pump, 14a... Suction port, 18, 18a...
Pipe, 20...Main body, 20a...Inflow port, 20b...
...Discharge port, 20c...Air hole, 22...Electric heater, 24...Space.

Claims (1)

[Scope of Claims] 1. A circulation pipe for circulating a heat transfer liquid having high viscosity at a low temperature, and a heating section for heating the heat transfer liquid in the circulation pipe, and a heating section for forcedly circulating the heat transfer liquid. In a heat exchanger equipped with a circulation pump and a heat radiating part that radiates heat from a heat medium liquid, the heating part includes a box-shaped body in which the heat medium liquid is stored, and a box-shaped body arranged at the bottom of this body. a heat medium liquid discharge port provided at the upper part of the main body and connected to the circulation pipe, and an inlet for the heat medium liquid provided at the lower part of the main body and connected to the circulation pipe, The pump is disposed in a circulation pipe between the discharge port of the heating section and the heat radiating section in order to suck the heat medium liquid whose viscosity has been reduced by being heated in the heating section and send it to the heat radiating section. heat exchanger.