JPS6342257Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat exchanger, and more specifically, to a heat exchanger that preheats the heat transfer liquid, ensures fluidity of the heat transfer liquid at the time of starting use, and has a quick start-up. .

The inventor of this invention sealed a fluid with a high boiling point, a low melting point, and a small specific heat, such as ethylene glycol or triethylene glycol, as a heat medium in a circulation pipe that includes a heat exchange part and a heat source. Therefore, he invented and applied for a heat exchanger that can heat to a high temperature, is efficient, and has a small specific heat, so it starts up quickly (Japanese Patent Application No. 57-204942).

However, the viscosity of liquids such as ethylene glycol increases as the liquid temperature decreases, resulting in extremely poor fluidity.

For this reason, in heat exchangers that use ethylene glycol or the like as a heat transfer fluid, when the heat transfer fluid is not being used and the heat transfer fluid is not being heated, the outside temperature drops and the heat transfer fluid flows. If the heat source is turned on for use after the heat source has deteriorated, the circulation pump, which is generally activated at the same time as the heat source is turned on, may become overloaded and damaged, or if the circulation pump is equipped with an overload protection circuit. When this happens, only the heat transfer fluid inside the heating section is partially heated, and the heated heat transfer fluid does not flow through the circulation pipe, causing damage to the heating section or destruction of the heating section. There is a risk that protective devices such as temperature fuses attached to the heating section will be activated and the heat exchanger will become unusable.

The present invention was developed in view of the above-mentioned difficulties, and its purpose is that even if a fluid such as ethylene glycol whose viscosity increases as the temperature decreases is used as the heat transfer liquid, it will not evaporate at the beginning of use. Our goal is to provide a heat exchanger that does not damage the heating part or the circulation pump, and that starts up quickly.The feature is that the heat medium liquid is heated by a heating source and circulated by a pump in the circulation pipe, and the heat is radiated. In a heat exchanger that dissipates heat in the heat exchanger, a liquid such as ethylene glycol, which has a low specific heat, a high boiling point, and a viscosity that increases as the temperature decreases, is used as the heat medium liquid, and the temperature of this heat medium liquid is detected. means is provided, a preheating source for the heat transfer liquid is provided, and the temperature of the heat transfer liquid heated by the preheating source is maintained at a liquid temperature at which the viscosity is required for circulation through the circulation pipe. A control circuit is provided to control the preliminary heating source.

Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

Fig. 1 shows a heat exchanger used as a heating device, and 1 is a heating section, which includes a container 1a formed with a heat-insulating structure, and two electric heaters 1b and 1c provided inside the container 1a. Consists of.

2 is a heat dissipation section, and a plurality of panels 2a, 2
It consists of b and 2c. These panels 2a, 2b, 2c
For example, in the case of floor heating, it is used by being spread on the floor.

3 is a pump, and 4 is an expansion chamber.

These heating section 1, heat radiating section 2, pump 3, and expansion chamber 4 are connected in series through a pipe 5 to form one circulation pipe.

In addition, a liquid such as ethylene glycol, which has a high boiling point and low specific heat, and whose viscosity increases at low temperatures, is sealed in this circulation pipe as a heat medium 6, and this heat medium 6 is pumped by a pump 3. The heat is heated in the heating section 1, the heat is radiated into the room by the heat radiation section 2, and the portion expanded by heating is absorbed in the expansion chamber 4 and flows into the circulation pipe.

Next, the circuit for controlling the electric heaters 1b and 1c shown in FIG. 2 will be explained. Numeral 10 is a temperature fuse, which is attached to the outer wall of the container 1a, and when the temperature of the container 1a reaches a predetermined temperature or higher. It is connected in series with the power supply to fuse and interrupt all electrical circuits.

Reference numeral 11 denotes a control circuit, to which power is supplied via the temperature fuse 10.

12 is a power switch, and when this power switch 12 is turned on, a relay 13 in the control circuit 11 is activated.
It becomes ON. Note that the open contact 13a of this relay 13
is connected in series with temperature fuse 10.

Further, the electric heater 1b is connected to the power supply via the temperature fuse 10, the opening contact 13a and the opening contact 14a of the relay 14 in the control circuit 11, and the electric heater 1c is connected to the temperature fuse 10, the opening contact 13a and the opening contact 14a in the control circuit 11. The pump 3 is connected to the power supply via the open contact 15a of the relay 15, and the pump 3 is connected to the power supply via the temperature fuse 10 and the open contact 13a.

Reference numeral 16 denotes a liquid temperature sensor, which is disposed at a location in the circulation pipe that is most likely to be cooled, and at a location away from the heating section 1 so as not to detect the heat of the heating section 1. When the temperature detected by the liquid temperature sensor 16 falls below a predetermined temperature, the relay 14 is driven and the open contact 14a turns on, and when the temperature falls below the predetermined temperature, the open contact 14a turns off.

Note that when ethylene glycol is used as the heat medium 6, this predetermined temperature is preferably set to 10°C to 15°C from the viewpoint of fluidity of the heat medium 6.

17 is a switch that is turned on during heating;
8 is an indoor temperature sensor. When the switch 17 is turned on, the relay 14 is driven to heat the room, and the electric heater 1b generates heat by turning on the open contact 14a. In addition, when the amount of heat generated by the electric heater 1b alone is insufficient or when you want to raise the indoor temperature in a short time, turn on a predetermined switch (not shown) to drive the relay 15 and turn on the open contact 15a to heat the electric heater. The heater 1c is energized.

Note that the relays 14 and 15 are controlled by an indoor temperature sensor 18 to heat the indoor temperature to a desired temperature. The relay 14 also includes a liquid temperature sensor 16
OR where the signals from and indoor temperature sensor 18 are input
Controlled by a gate circuit.

Since the present invention is constructed as described above, by turning on the power switch 12 when the room is not being heated, that is, when the switch 17 is not turned on, the relay 13 is driven and its open contact 13a is turned on. When turned on, the pump 3 is driven and the heat medium 3 flows in the circulation pipe.

On the other hand, the liquid temperature of the heat medium 6 is detected by the liquid temperature sensor 16, and when the liquid temperature becomes 10°C or lower, the relay 14 is driven and its open contact 14a is turned on, and the electric heater 1b is energized to heat the heat medium 6. do.

Thus, the electric heater 1b is controlled intermittently to maintain the heat medium 6 at a temperature of 10°C to 15°C.

Next, when heating the room, the switch 17 is turned on to drive the relay 14 until the room temperature reaches a predetermined temperature, turning the open contact 14a ON, and heating the heat medium 6 by energizing the electric heater 1b.

In addition, in the above-mentioned Example, although the electric heater used at the time of heating was shared as a power supply for preheating, it is not limited to this and a preheating heater may be provided separately. Furthermore, although an electric heater is used to heat the heat medium, this electric heater may be one using dielectric heating or induction heating in addition to resistance heating. may also be used.

In this way, according to the present invention, even when the outside temperature drops, the heat transfer liquid always maintains a predetermined temperature and does not lose its fluidity, so the heating part does not damage the pump when heating is started. Furthermore, since the heat transfer liquid is preheated to a predetermined temperature, the indoor temperature rises more quickly when heating starts.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a circulation pipe of the heating device, and FIG. 2 is an electric circuit diagram thereof. 1... Heating section, 1a... Container, 1b, 1c...
Electric heater, 2... Heat radiation part, 2a, 2b, 2c...
...Panel, 3...Pump, 4...Expansion chamber, 5...
Tube, 6... Heat medium, 10... Temperature fuse, 11
...Control circuit, 12...Power switch, 13,1
4, 15...Relay, 13a, 14a, 15a...
...Open contact, 16...Liquid temperature sensor, 17...Switch, 18...Indoor temperature sensor.

Claims (1)

[Scope of utility model claims] In a heat exchanger that heats a heat medium liquid using a heating source, circulates it in a circulation pipe with a pump, and radiates heat in a heat radiating section, the heat medium liquid is a liquid that has a low specific heat, a high boiling point, and a low temperature, such as ethylene glycol. Using a liquid whose viscosity increases as A heat exchanger comprising a control circuit that controls the preliminary heating source to maintain the liquid temperature at a temperature that provides a viscosity necessary for circulation through the circulation pipe.