JPH0350185B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an operation display circuit for a hot water boiler that generates hot water for hot water supply or space heating.

(b) Conventional technology In this type of hot water boiler, for example,
As disclosed in the publication, a normally open operating switch and a normally open antifreeze thermoswitch were connected in parallel, and the combustion control circuit was connected to a power source via these parallel circuits. Even when the operating switch is open, when the antifreeze thermoswitch is closed, the combustion control circuit is activated to perform the combustion operation, thereby preventing freezing when the hot water boiler is not in use.

(c) Problems to be solved by the invention By the way, in the hot water boiler described above, an operation indicator lamp is connected in parallel with the combustion control circuit, and the indicator lamp is turned on when the operation switch or antifreeze thermoswitch is turned on. It informed me that it was in driving condition.

However, since the display during normal operation and anti-freeze operation are the same, not only is it impossible for the user to distinguish between them, but also the operation indicator lamp does not come on during anti-freeze operation even though the operation switch is turned off. There was a concern that it would give the user an abnormal feeling that the light was on. Of course, this kind of problem can be solved by using multiple indicator lamps, but with hot water boilers, the operation indicator circuit is usually housed in a small remote control case, which makes it difficult to take up a large installation space. .

This invention has been made in view of the above-mentioned facts, and aims to make it possible to clearly distinguish between the display during normal operation and the display during antifreeze operation without taking up a large installation space. .

(d) Means for solving the problem In this invention, a normally open contact and a combustion control circuit of an operation switch having a normally open contact and a normally closed contact are connected in series, and the normally open contact and the combustion control circuit are connected to a power source. A normally open anti-freeze thermoswitch is connected in parallel with the contact, and the anti-freeze thermoswitch, the normally closed contact of the operation switch, and the first indicator lamp are connected in series in sequence, and this is connected to the power source,
A second indicator lamp is connected in parallel with the combustion control circuit, and the first indicator lamp and the second indicator lamp have different luminescent colors and are housed together in one molded body. It is the composition.

(e) Effect With this configuration, when the operation switch is turned on (the normally open contact is closed), or when the antifreeze thermoswitch is closed while the operation switch is opened (the normally closed contact is closed), The combustion control circuit is energized and the hot water boiler performs combustion operation. In the former case,
A second indicator lamp is energized through the normally open contact of the operating switch, and the second indicator lamp illuminates to indicate that the hot water boiler is in a normal firing state. In the latter case, the second indicator lamp is energized via the antifreeze thermoswitch, and the first indicator lamp is energized via the antifreeze thermoswitch and the normally closed contact of the operation switch, so that both indicator lamps are lit. Notifies that the hot water boiler is in antifreeze operation. In this way, the second indicator lamp lights up during normal operation, and the first and second indicator lamps light up during antifreeze operation, making it easy to identify which operating state the hot water boiler is in. There is no need to worry about giving any abnormal feeling to the user. Moreover, since the first and second indicator lamps have different luminescent colors and are housed together in one molded body, they appear to be the same during normal operation and antifreeze operation. Each indicator lamp appears to be displaying a different color, which not only provides an aesthetically pleasing driving display, but also saves display space.
Suitable for housing the operation display circuit in a small remote control case.

(F) Embodiments The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a sliding operation switch, which is provided with a normally open contact 1A and a normally closed contact 1B that are alternately opened and closed by an operation knob (not shown). Further, reference numeral 2 denotes a normally open antifreeze thermoswitch that closes when the outside temperature or pipe temperature near the hot water boiler drops to a certain temperature close to the freezing point. The normally open contact 1A of the operation switch 1 and the antifreeze thermoswitch 2 are connected in parallel, and these parallel circuits and the combustion control circuit 3 are connected to the DC power terminals 4 and 5.
connected in series between. Further, the antifreeze thermos switch 2 and the normally closed contact 1B of the operation switch 1 are connected in series, and these series circuits, the protective resistor 6, and the first indicator lamp (diode that emits red light) 7 are connected to the DC power terminal 4. , 5 are successively connected in series. Further, a DC circuit including a protective resistor 8 and a second indicator lamp (diode that emits green light) 9 is connected in parallel to the combustion control circuit 3.

The combustion control circuit 3 includes a hot water temperature control circuit 10 and a burner control circuit 11. The hot water temperature control circuit 10 has a temperature sensor 12 that detects the water temperature in the can body (not shown) of the hot water boiler and a temperature setting device 13, and the water temperature in the can is determined by the set temperature of the temperature setting device 13 (user's (adjustable in the range of, for example, 40 DEG C. to 80 DEG C.), the normally open relay switch 14 is closed. Further, the burner control circuit 11 causes a burner (not shown) to carry out a combustion operation by applying electricity. Note that the first indicator lamp 7 that emits red light and the second indicator lamp 9 that emits green light are housed together in one molded body 15, and when they emit light at the same time, they act as if they were one indicator lamp. It has been devised so that it looks like it is emitting orange light.

Furthermore, the temperature setting device 13 has a normally open switch 16 that is linked to the operation switch 1. When the normally closed contact 1B of the operation switch 1 closes, the normally open switch 16 opens and the user can perform setting operations. Regardless, the set temperature is kept on the low-temperature side (for example, 10°C to 20°C).

When the user turns on the operating switch 1, the normally open contact 1A closes, the normally closed contact 1B opens, and the normally open switch 16 of the temperature setting device 13 closes. At this time, the combustion control circuit 3 is energized via the normally open contact 1A of the operation switch 1, raising the water temperature inside the can to near the set temperature set by the user. That is, when the water temperature is lower than the set temperature, the relay switch 14 is closed by the output of the hot water temperature control circuit 10, and the burner control circuit 11 operates the burner. Further, when the water temperature is higher than the set temperature, the relay switch 14 is opened, the burner control circuit 11 is de-energized, and the burner stops combustion. Also, while the operation switch 1 is turned on, a second
Since the indicator lamp 9 is energized, the second indicator lamp 9 emits green light to notify that the hot water boiler is in a normal operating state.

When the user opens the operating switch 1, the normally open contact 1A opens, the normally closed contact 1B closes, and the normally open switch 16 of the temperature setting device opens. At this time, the combustion control circuit 3 is de-energized and the second indicator lamp 9 is turned off.

When the antifreeze thermoswitch 2 is closed while the operation switch 1 is open, the combustion control circuit 3 is energized via the antifreeze thermoswitch 2. At this time,
The combustion control circuit 3 compares the water temperature inside the can with a set temperature adjusted to the low temperature side, and maintains the water temperature near this set temperature. For this reason, even if the outside temperature drops and there is a risk of freezing, it not only prevents the inside of the can from freezing, but also prevents freezing inside the piping and parts (especially valves such as safety valves) near the can. This can be prevented by heat dissipation from the can, and is particularly effective in cases where the can body and components are housed within the housing. In addition, a second
The indicator lamp 9 is energized, and the normally closed contact 1B of the antifreeze thermoswitch 2 and the operation switch 1 is turned on.
Since the first indicator lamp 7 is energized through the first indicator lamp 7 and the protective resistor 6, the first indicator lamp 7 emits light at the same time to provide an orange luminescent display, indicating that the hot water boiler is in the antifreeze operation state.

FIG. 2 shows another embodiment of the invention. In this embodiment, a single-pole, double-throw operation switch 17 is used which has a common contact 17C in addition to a normally open contact 17A and a normally closed contact 17B.

(G) Effects of the invention Since this invention is configured as described above,
During normal operation, the second indicator lamp is energized,
During antifreeze operation, the first and second indicator lamps are energized, and by lighting these lamps, the operating status of the hot water boiler can be clearly identified, eliminating the risk of giving the user a sense of abnormality during antifreeze operation. It is very easy to use. Moreover, since the first and second indicator lamps have different luminescent colors and are housed together in one molded body, they appear to be the same during normal operation and antifreeze operation. The display lamps appear to display different colors, which not only provides an aesthetically pleasing driving display, but also saves display space, especially since the driving display circuit is housed in a small remote control case. It is convenient for

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of an operation display circuit for a hot water boiler showing one embodiment of the invention, and FIG. 2 is an electric circuit diagram of an operation display circuit for a hot water boiler showing another embodiment of the invention. 1, 17...operation switch, 1A, 17A...
Normally open contact, 1B, 17B... Normally closed contact, 2... Freeze prevention thermo switch, 3... Combustion control circuit,
4, 5...DC power supply terminal, 7...First indicator lamp, 9...Second indicator lamp, 15... Molded object.

Claims (1)

[Claims] 1 Connect the normally open contact and combustion control circuit of the operating switch, which has a normally open contact and a normally closed contact, connected in series to a power source, and connect a normally open antifreeze thermoswitch in parallel with the normally open contact. Then, the antifreeze thermoswitch, the normally closed contact of the operation switch, and the first indicator lamp are connected in series to the power source, and a second indicator lamp is connected in parallel to the combustion control circuit. An operation display circuit for a hot water boiler, characterized in that the first indicator lamp and the second indicator lamp have different luminescent colors and are housed together in one molded body.