JPH02254230A - Hot water space heater - Google Patents

Abstract

PURPOSE:To allow heating load to prevent boil in at least a heat exchanger part at the time of operation start by burning and controlling the device by specified middle heating power in which a burner is predetermined when the outlet side hot water temperature of a heat exchanger reaches a predetermined set temperature at which the burner is burned by maximum heating power after operation start. CONSTITUTION:When operation start actuation is performed by the actuation of an operation switch 35 of a main remote controller 34, a control circuit 33 actuates a circulation pump 6 while an electromagnetic open and close valve 30 and the like are opened to make a gas burner 4 strong combustion (for example, 20000kcal/h) to supply a thermal valve 20 with electricity so as to begin to open it. When the outlet temperature of a heat exchanger 3 by the detection of a high temperature detector 26 from operation start reaches, for instance, 80 deg.C, a proportional valve 31 is controlled to burn and control the heating power of the gas burner 4 by intermediate heating power (for instance, 9000kcal/h) between the heating power at the time of the strong combustion and the heating power at the time of weak combustion (for instance, 3600kcal/h). Thereby, boil in the inside of a heat exchanger in the case where load at the time of operation start is comparatively small can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hot water heating device for heating a room or the like by circulating hot water.

(b) Prior art The above-mentioned hot water heating system has been proposed, for example, in Japanese Patent Application No. 63-10706.
As shown in No. 8, the burner firepower is controlled to be strong, weak, or stopped in response to changes in hot water temperature due to heating load, and
A proportional control area (
In the case where b) in Fig. 4 is installed, at the start of operation, the gas burner is first controlled with strong combustion, and when the hot water temperature reaches the above reference temperature, proportional control is performed.
56a), (56b), and (56c), and when the load is small, such as when the bathroom ventilation dryer (72) etc. is not in use and the valves installed on these are closed, the above standards are met. If the proportional control is performed after the temperature has been reached, the hot water temperature will rise rapidly and boiling will occur in the heat exchanger.

(c) Problems to be Solved by the Invention The present invention aims to prevent boiling inside the heat exchanger as described above, particularly at the time of starting operation.

(d) Means for Solving the Problems The present invention includes a hot water circulation flow path that circulates hot water heated in a heat exchanger to a radiator using a circulation pump, and a temperature detector that measures the hot water temperature on the outlet side of the heat exchanger. and a control means for controlling the thermal power of the burner that heats the heat exchanger using a proportional valve so that this temperature becomes the set temperature. When the hot water temperature on the outlet side of the exchanger reaches a preset temperature at which the burner burns at maximum thermal power, the burner is controlled to burn at a predetermined medium thermal power.

(E) After the start of operation, when the hot water temperature on the outlet side of the heat exchanger reaches the preset temperature at which the burner burns at maximum thermal power,
The burner is controlled to burn at a predetermined medium heat power, which prevents the heating load from boiling at least in the heat exchanger section at the start of operation.

(f) Example An example of the present invention will first be explained based on FIG.
) is the main body of the hot water heater, which includes a heat exchanger (3) inside the outer case (2), a gas burner (4) that heats it, an exhaust duct (5) that discharges the exhaust gas from this gas burner to the outside, and a circulation pump ( 6), an expansion tank (7), etc.

The heat exchanger (3) also includes a reheating coil (11) for reheating water (10) in a bathtub (9) through a branching header (8), a header (12), and an expansion coil. Tank (7
)-circulation pumps (6) are sequentially connected in a loop to form a hot water circulation circuit (13). A heating radiator (14) installed indoors or the like is also connected between the header (8) and (i2), and an on-off valve (15) that is connected to an operation switch (not shown) is located close to the radiator. ), and the reheating coil (11) is also provided with an on-off valve (15).

Furthermore, downstream of the circulation pump (6), a low-temperature water circulation circuit (17) that returns from the chain portion to the header (12) via the low-temperature header (16) is branch-connected, and the low-temperature water circulation circuit (17) returns to the header (12) via the low-temperature header (16). (12), a low-temperature radiator, such as a well-known floor heating panel (18), is connected between the low-temperature header (16) and a controller ( 19) is equipped with a thermal valve (20) that is controlled to open and close.

Note that the controller (19) and the thermal valve (20) are a set, and as the number of controllers (19) increases, the number of thermal valves (21) and (22) increases, and the increased number of thermal valves A load such as the above-mentioned floor heating panel (18) is connected to the connecting pipes (23) and (24), which are opened and closed, respectively. In addition, these thermal valves are designed to gradually open built-in valves (not shown) by operating the operation switch (25) of a load such as a floor heating panel (18) provided in the controller (19) to start operation. .

(26) is a high temperature temperature detector consisting of a thermistor etc. that detects the hot water temperature on the outlet side of the heat exchanger (3); (27)
(28) is a low temperature temperature sensor which detects the hot water temperature slightly downstream of the circulation pump (6) of the hot water circulation circuit (13), and (28) is made of a thermistor or the like;
) is a bypass pipe that short-circuits the downstream of the heat exchanger (3) and the upstream of the expansion tank (7).

(29) is a gas passage that supplies gas to the gas burner (4), and from its upstream side, an electromagnetic on-off valve (30), a gas proportional valve (31), and an electromagnetic switching valve (32) are connected in sequence. .

(33) is a control circuit using a microcomputer,
The main remote control (34) or the controller (1)
When the operation start operation of the operation switch (35) (25) provided in 9) is detected, the electromagnetic on-off valve (30), gas proportional: # (31), and the magnetic switching valve (32) are activated, and the The ignition device that does not operate is activated to ignite the gas burner (4), and the circulation pump (6) is rotated to control the heating of the Tonkan water in the hot water circulation channel (13) and the low temperature water circulation channel (17). It is.

On the other hand, the control circuit (33) is connected to the main remote controller (34).
When the operation start operation is performed by operating the operation switch (35), the circulation pump (6) is activated, the electromagnetic on-off valve (30), etc. h) I, and thermal valve (
20) and start opening it. Then, by starting the operation, the outlet temperature of the heat exchanger (3) as detected by the high temperature temperature detector (26) changes to C temperature (for example, 8
When the temperature reaches 0℃, the proportional valve (31) is controlled to change the thermal power of the gas burner (4) between the thermal power for strong twist firing and the thermal power for weak combustion (for example,
．． 600Kcatch) medium firepower (e.g. 9
．． Combustion is controlled at 0OOK cal/h).

Next, this control lowers the outlet temperature to the C temperature (
For example, when the temperature reaches 67°C, the gas burner (4) is strongly twisted and fired again, and when the outlet temperature rises due to this strong twisting and reaches the C temperature again, proportional control is performed to maintain this C temperature. However, even if this proportional control is performed, when the outlet temperature reaches C temperature (for example, 83°C), the electromagnetic switching valve (32
) is closed for weak combustion (for example, 3.600 K cal
/h), and even in this weak combustion, when the outlet temperature rises and reaches C temperature (e.g. 88°C), the electromagnetic on-off valve (
30) and stop combustion of the gas burner (4).

Then, due to the combustion stop mentioned above, the outlet temperature becomes b temperature (for example, 7
0℃), the gas burner (4) is weakly combusted, and the outlet temperature rises due to the weak combustion.When the temperature reaches the above C temperature, the combustion of the gas burner (4) is stopped again, and on the other hand, the outlet temperature decreases due to the weak combustion. When the temperature reaches C, strong twisting is performed and this process is repeated.

In addition, during the above-mentioned medium combustion at the beginning of operation, the temperature of the load is normally low, so the temperature drops to C temperature in a short time, but for some reason, for example, 3 minutes have elapsed due to reasons such as not much time having passed since the previous operation stop. If the temperature does not drop to C, forcefully perform strong twist firing to shorten the time it takes for the temperature of the circulating water to rise.

On the other hand, the operation switch (25) of the controller (19)
When the floor heating panel (18) is used by the above operation, the thermal valve (20) starts to be energized at the same time as the operation start operation, and the gas burner (4) is ignited and burned. heat exchanger (
When the outlet temperature of 3) reaches the above C temperature, the gas burner (
When the thermal power in step 4) is controlled to a medium level in the same way as above, and the outlet temperature reaches C again due to subsequent combustion, the return hot water temperature detected by the low temperature temperature detector (27) will be, for example, 60°C.
Adjust the firepower of the gas burner (4) so that In addition, in this control as well, the temperature C in FIG.
℃, the C temperature is, for example, 52℃, the b temperature is, for example, 55℃, the C temperature is, for example, 63℃, and the C temperature is, for example, 68℃.
control by setting it to .

Furthermore, if the return hot water temperature control by the controller (19) and the operation operation by the main remote controller (35) are not performed at the same time, the main remote controller (35)
Temperature detection for high temperatures! Control based on the outlet temperature detected in (26) is performed with priority.

In addition, in the control using the return hot water temperature, if the hot water temperature drops to, for example, 50°C or less even in strong twist firing, the control using the return hot water temperature is canceled and the high temperature temperature is detected! Temperature control (control with a target of 80° C.) is performed based on the detection of (26). In such a case, for example, when the load suddenly increases due to additional operation of the thermal valves (21) and (22), and even though the flow rate passing through the heat exchanger (3) decreases, the gas burner (4) is often strongly twisted and fired, and in this case, boiling noise is likely to occur in the heat exchanger (3), so this is to prevent this.

In addition, when switching to outlet temperature control in the middle of the above return hot water temperature control, the return hot water temperature is detected by the low temperature temperature detector (27) even after the switch, and the return hot water temperature reaches the above set temperature of 60°C. At that point, the system returns to control based on the hot water temperature.

(g) Effects of the Invention According to the configuration of the present invention, when the hot water temperature on the outlet side of the heat exchanger reaches the set temperature at the beginning of operation, combustion control is performed on the gas burner at a preset medium heat power, so that at the beginning of operation It is possible to prevent boiling inside the heat exchanger when the load on the heat exchanger is relatively small, thereby preventing the generation of boiling noise.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of the present invention, and FIG. 2 is a characteristic diagram for explaining the operation. (3)...Heat exchanger, (4)...Gas burner, (6
)...Circulation pump, (11)...Reheating coil, (
13)... Hot water circulation circuit, (14)... Heat radiator, (18)... Floor heating panel, (26)...
Temperature detector for high temperature, (27)...temperature detector for low temperature,
(33)...Control circuit. Applicant: 1 other person from Sanyo Electric Co., Ltd. Representative: Patent attorney Takuji Nishikei (2 others) Figure 1 Figure 2 a b cd e (67”C) <70℃) (80℃) (83℃) (88
℃) (52℃) (55”C) (60℃) (63℃)
(68℃)−> Hot water temperature

Claims (1)

[Claims] (1) A temperature sensor detects the temperature of the hot water circulation channel in which hot water heated by the heat exchanger is circulated to the radiator by the circulation pump and the temperature of the hot water on the outlet side of the heat exchanger, and this temperature is the set temperature. and control means for controlling the thermal power of the burner that heats the heat exchanger using a proportional valve, and the control means controls the hot water temperature at the outlet side of the heat exchanger only at the start of operation. A hot water heating device characterized in that when the burner reaches a preset set temperature at which the burner burns at maximum heat power, the burner is controlled to burn at a predetermined medium heat power set in advance.