JPH0131861Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a compound heating system in which a floor heating system or other external load is added to a heating system.

(Prior Art) A composite heating device in which an external load such as a floor heater is added to a conventional heating device such as a stove is known from, for example, Japanese Utility Model Application No. 51-126052.

However, in this type of conventional combined heating system, a heat medium that is forcedly circulated between the load and the load through natural ventilation is heated by a heat exchanger, so that the heat transfer is performed according to the load's need for heat. When the circulation to the load side is stopped, the heat medium is heated in the heat exchanger, and if it boils in the heat exchanger, there is a risk that it will boil and scatter outside, and there is also the inconvenience of producing boiling noise. .

In order to eliminate this inconvenience, the applicant of the present invention has separately proposed a device with an additional means for exchanging heat with the heat exchanger only when heat is required by the load.

(Problem that the invention aims to solve) However, even with this device, when the circulation of the heat medium is cut off due to no demand for heat on the load side, the heat exchanger is heated by radiant heat, etc., resulting in the same problem. ,
This becomes more noticeable especially as the surface area of the heat exchanger is increased to increase the heat exchange efficiency in the heat exchanger and the heat medium capacity within the heat exchanger is decreased.

(Means for solving the problem) The purpose of the present invention is to obtain a control circuit for a compound heater that can cope with such a situation. A heat exchanger 2 is provided, and a heat medium is forcedly circulated between the heat exchanger 2 and an external load 3 by a pump 4, and hot air is introduced into the heat exchanger 2. a control circuit 9 provided with means 5 and comprising an actuation circuit 6 of said introduction means 5 as well as an actuation circuit 8 of said pump 4;
The control circuit 9 is provided with a detection circuit 10 for detecting heat demand on the load side, and the detection circuit 1
A signal circuit 12 is provided which includes an output signal element 11 that generates an output signal at intervals such as a timer that operates when a non-demand for heat on the load side of 0 is detected, and a detection circuit is provided in the operating circuit 8 of the pump 4. A switch 13 that closes in response to the heat demand of 10 and a switch 14 that closes in parallel with the switch 13 in response to the output signal of the signal circuit are interposed, and furthermore the actuation circuit 6 of the introduction means 5.
A switch 15 that closes in response to the heat demand of the detection circuit 10 is inserted.

(Function) The operation of the present invention will be explained for a pot-type kerosene stove in which the combustion control circuit 17 of the heater 1 is connected to the control circuit 9 via the power switch 16.

When the power switch 16 is turned on, the combustion control circuit 17 is activated, the combustion blower 18 and the solenoid valve 19 provided in the heater 1 are opened, and fuel is supplied to the pot burner 1a, and the igniter (not shown) is activated. This causes ignition and combustion.

If the detection circuit 10 detects in this case that there is a heat demand on the load 3, a switch 15 intervenes in the actuation circuit 6 of the introduction means 5 as well as in the actuation circuit 8 of the pump 4.
The switch 13 that intervenes is closed. Therefore, hot air is introduced into the heat exchanger 2 by the introducing means 5, and heat can be supplied to the load 3 by forcing the heat medium that has been heat exchanged by the heat exchanger 2 to circulate through the load 3. However, when the detection circuit 10 detects that no heat is required on the load 3 side, the switches 13 and 15 intervening in both the operating circuits 6 and 8 close, so that the introducing means 5 and the pump 4 become inactive.

Therefore, heat exchange in the heat exchanger 2 is no longer performed, and the supply of heat to the load 3 is cut off.

However, if this state continues, the heat exchanger 2 will be heated by the radiant heat of the heater 1 and other heat.

However, in this case, the output signal from the signal circuit 12 having the output signal element 11 that generates an output signal at an interval of a timer or the like that operates when the detection circuit 10 detects the non-requirement of heat on the load 3 side is used. The switch 14 intervenes in the operating circuit 8 of the pump 4.
2 closes after a certain time interval, the heating medium with increased temperature can be moved to the load 3 side, and it is possible to prevent the temperature of the heat exchanger 2 portion from increasing intensively.

(Example) An example of implementing the present invention will be explained with reference to the drawings.

In the drawings, reference numeral 1 indicates a kerosene-burning heater equipped with a pot burner 1a inside the combustion tube 1b.
A flat heat exchanger 1c is provided on the top of the heat exchanger 1c, and combustion gas is discharged through an exhaust pipe (not shown) connected to the heat exchanger 1c.

The pot burner 1a has an oil amount regulator 1d.
A passage 1e connects the oil amount regulator 1d and the pot burner 1a.
The solenoid valve 19 is interposed in the air chamber 1f surrounding the pot burner 1a, and the air chamber 1f is a ventilation duct 1g.
18 sections of the blower are connected through the air blower. 2 is the heater 1
shows a heat exchanger installed adjacent to the combustion cylinder 1b,
The heat exchanger includes a hot air passage 20 which is connected to the upper part of the combustion cylinder 1b at one end and whose other end is open to the heat exchanger 1c.
In addition, a blower as the introducing means 5 is attached to the hot air passage 20, and the blower 5 actively supplies hot air to the heat exchanger 2. However, it goes without saying that the introducing means 5 is not limited to a blower, but may also be a damper or the like. Reference numeral 3 indicates a floor heating machine as an external load connected to the heat exchanger 2, and 4 indicates a pump that circulates a heat medium between the heat exchanger 2 and the external load 3, with the pump 4 interposed. A reserve tank 2b was interposed in the heat medium circuit 2a. In the embodiment shown in FIGS. 1 and 2, one end of the hot air passage 20 is connected to the combustion tube 1.
b and the other end is connected to the heat exchanger 1c.
However, the connection may be changed in various ways, such as by communicating the openings at both ends of the combustion tube 1a, as shown in FIGS. 3 and 4. In the drawing, 21 is a thermistor or other temperature sensor for detecting the temperature of the load 3. FIG. 5 shows an electrical circuit comprising a control circuit 17 of the heating machine 1 and a control circuit 9 comprising an operating circuit 6 of the introduction means 5 and an operating circuit 8 of the pump 4. FIG.

To explain this below, the electric circuit includes a detection circuit 10 in which the temperature detector 21 is connected to a power source via a power switch 16 and an operation switch 22 which also serve as operation switches for the control circuit 17 of the heater 1; The circuit 10 includes a relay _R1 which is energized by a load request, and the a contact of the relay _R1 is connected to the switch 1.
The blower 5 connected to the operation switch 22 as 5
the operating circuit 6 connected to the motor 5a of the pump 4; the operating circuit 8 connected to the operating switch 22 via the a contact of the relay _R1 as the switch 13; A relay circuit 23 includes a relay R ₂ connected to the power switch 16, a B contact R ₁ -1b of the relay R ₁ and a B contact R ₂ - of the relay R ₂ parallel to this.
The signal circuit 12 is provided with the output signal element 11 connected to each other via 1b, and the contact 14 of the output signal element 11 is inserted in parallel with the switch 13 that intervenes in the operating circuit 8.

The detection circuit 10 connects the voltage dividing points of the resistors r ₁ and r ₂ that set the reference potential to the positive terminal of the comparator Cp, and connects the temperature sensor 21 to the negative terminal of the comparator Cp. When the voltage dividing point with the variable resistor _r3 is connected and the potentials of both terminals become equal due to the temperature rise of the load 3, an output is generated to the comparator Cp, and the voltage is connected between the emitter and the erector of the transistor T as a switching element that intervenes in the relay _R1. conducts to excite relay _R1 , and there is no particular difference from commonly used detection circuits. Next, its operation will be explained.

When the power switch 16 and operation switch 22 are closed now, when the temperature on the load 3 side is low, that is, when the load 3 has a heat request, an output is generated in the detection circuit 10 and the relay R ₁ is energized. each contact switches. Therefore, the blower 5 and the pump 4 are operated, and the heat medium is forced to circulate between the load 3, the heat exchanger 2, and the reserve tank 2b, and combustion gas is forcibly supplied to the heat exchanger 2 by the blower 5. be done.

Then, when the temperature on the load 3 side rises and the detection circuit 10 loses its output, the relay _R1 is demagnetized, thereby switching its contacts. Therefore, the blower 5 and the pump 4 are stopped.

Therefore, heat exchange in the heat exchanger 2 and supply of heat to the load 3 are cut off.

If this stopped state continues, the heat exchanger 2 will be heated by radiant heat etc., and the temperature of only the heat exchanger 2 may rise rapidly. Since the switch 14 intervening in the actuating circuit 8 is closed after a certain interval by the output signal of , the heat is radiated to the load 3 side, thereby eliminating the above-mentioned inconvenience.

Incidentally, such a temperature increase in the heat exchanger 2 may also occur when only the heater 3 is used with the operation switch 22 open, but it can be prevented in this case as well.

As shown in FIG. 6, a three-way valve 23 is interposed in the middle of the heat medium circuit 2a, and the three-way valve 24 is connected to the fifth
As shown by the chain dots in the figure, it is connected to the output signal element 11 through the a contact 25 of the output signal element 11 so that the output of the output signal element 11 switches the three-way valve 24 simultaneously with the operation of the pump 4. Then, when there is no heat demand for load 3, heat exchanger 2 and reserve tank 2
It is also possible to circulate the heat medium only between the parts b and b. In addition, although the above explanation was made regarding a heater equipped with a pot burner as the heater 1,
Needless to say, the burner is not limited to this.

(Effect of the invention) As described above, according to the invention, in the control circuit,
A signal circuit comprising a detection circuit that detects a heat request on the load side, and an output signal element that generates an output signal at intervals such as a timer that operates when the detection circuit detects a non-demand for heat on the load side. established,
Further, a switch that closes in response to the heat demand of the detection circuit and a switch that closes in response to the output signal of the signal circuit are inserted in the operating circuit of the pump, and a switch that closes in response to the output signal of the signal circuit is inserted in parallel with the switch, and further, the operating circuit of the introducing means is provided with a switch that closes in response to the heat demand of the detection circuit. Since a switch that closes depending on the load is inserted, combustion air can be applied to the heat exchanger to exchange heat only when there is a heat demand from the load.
Even when the load does not require heat, the pump can be driven at intervals by the output signal from the output signal circuit, and the heat concentrated in the heat exchanger can be released from the load side. It has the effect of eliminating the inconvenience caused by being seen.

[Brief explanation of the drawing]

Figure 1 is a cutaway front view of one example of implementing the present invention, Figure 2
The figure is a cross-sectional view taken along the line, FIG. 3 is a partial front view showing a modification of FIG. 1, FIG. 4 is a cross-sectional view taken along the line, FIG. FIG. 7 is a cutaway front view of main parts of another embodiment. 1... Heater, 2... Heat exchanger, 3... External load, 4... Pump, 5... Introduction means, 6, 8...
operating circuit, 9...control circuit, 10...detection circuit,
11... Output signal element, 12... Signal circuit, 1
3, 14, 15...switch.

Claims (1)

[Scope of utility model registration request] The heater is equipped with a heat exchanger that is heated using the heat of the heater, and a pump is used to forcefully circulate a heat medium between the heat exchanger and an external load. Provide an introduction means to introduce hot air into the
Further, a control circuit including an operating circuit for the introducing means and an operating circuit for the pump is provided to operate them, and the control circuit is provided with a detection circuit for detecting heat demand on the load side. , a signal circuit comprising an output signal element that generates an output signal at intervals such as a timer that operates when an unrequired heat on the load side of the detection circuit is detected, and a detection circuit is provided in the operation circuit of the pump. a switch that closes in response to the heat demand of the detection circuit; a switch that closes in response to the output signal of the signal circuit in parallel with the switch; and a switch that closes in response to the heat demand of the detection circuit in the operating circuit of the introduction means; A control circuit for a compound heating machine.