JPH10300068A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent accidentally spouting of high temperature hot water from a hot water cock in case a travel adjusting means breaks down by arranging the travel adjusting means to adjust the maximum and minimum travel of a proportional valve to the optimum value and an invalidation means to reject an input of the travel adjusting means after the passage of a specified time following the closing of a power source. SOLUTION: A maximum travel adjusting button 33 and a minimum travel adjusting button 35 send signals to a proportional valve 17 through an invalidation means. When the invalidation means lets the proportional valve 17 receive the signals of the maximum travel adjusting button 33 and the minimum travel adjusting button 35, upon the turning ON of the maximum travel adjusting button 33, a signal is sent to the proportional valve 17 to indicate the maximum travel. Upon the turning ON of the minimum travel adjusting button 35, a signal is sent to the proportional valve 17 to indicate the minimum travel. A timer works and the invalidation means is turned to make the proportional valve 17 reject the signals of the maximum travel adjusting button 33 and the minimum travel adjusting button 35 after the passage of a specified time following the closing of a power source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus provided in a gas supply path and having a proportional valve for adjusting a combustion amount by varying an opening degree.

[0002]

2. Description of the Related Art Conventionally, in a combustion device such as a gas water heater, when adjusting the maximum opening and the minimum opening of a proportional valve which is provided in a gas supply passage and adjusts a combustion amount by varying an opening. Is provided with a maximum adjustment switch and a minimum adjustment switch, forcibly setting the combustion state to a maximum combustion state and a minimum combustion state, and adjusting the volume with a volume switch for adjusting the opening degree of the proportional valve. In this case, if the maximum adjustment switch fails due to intrusion of water or the like, high-temperature hot water may suddenly come out of the hot water tap, so if the operation time of the maximum adjustment switch is long, or the hot water temperature from the hot water tap. When the value exceeds a predetermined value, the combustion is forcibly stopped.

[0003]

However, in the above-described combustion apparatus, if the combustion is stopped when the operation time of the maximum adjustment switch is long, a failure of the maximum adjustment switch cannot be detected within a predetermined time. Hot water may come out of the hot water tap.

Further, in the case where the combustion is stopped when the temperature of the hot water from the hot-water tap exceeds a predetermined value, the predetermined value must be set to a temperature (for example, 75 ° C.) at which the combustion does not stop during adjustment. After all, when the maximum adjustment switch breaks down, there is a problem that hot water may flow out of the hot water tap.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion apparatus for preventing hot water from being unexpectedly discharged from a hot water tap when an opening degree adjusting means of a proportional valve fails.

[0006]

In order to achieve the above object, the present invention provides a proportional valve which is provided in a gas supply path and adjusts a combustion amount by varying an opening degree. In the combustion device, an opening adjustment means for adjusting the maximum opening and the minimum opening of the proportional valve to an optimum opening, and an input from the opening adjustment means after a predetermined time has elapsed after power-on. Since there is no invalid means, even if the maximum opening adjustment means fails after the opening of the proportional valve, the input of the maximum opening adjustment means is not accepted, and hot water does not flow.

Further, in a combustion apparatus provided with a proportional valve which is provided in a gas supply path and adjusts a combustion amount by varying an opening, the maximum opening of the proportional valve is adjusted to an optimum opening. A plurality of maximum opening adjustment units, a detection unit that detects the presence or absence of an output of all of the plurality of maximum opening adjustment units, and a start unit that starts adjusting the opening of the proportional valve by an output of the detection unit. Since the adjustment of the opening of the proportional valve does not start unless the plurality of maximum opening adjustment means are operated, the reliability is improved.

Further, in a combustion apparatus provided with a proportional valve which is provided in a gas supply path and adjusts a combustion amount by varying an opening, the maximum opening of the proportional valve is adjusted to an optimum opening. Maximum opening adjustment means, minimum opening adjustment means for adjusting the minimum opening of the proportional valve to an optimal opening, detection means for detecting the presence or absence of output of the minimum opening adjustment means, Since there is provided invalidating means for invalidating the input of the maximum opening degree adjusting means according to the output of the means, the reliability is improved in the same manner as described above. Further, the invalidating means invalidates the input of the maximum opening adjustment means after a lapse of a predetermined time since the detection means detects the output of the minimum opening adjustment means.

Further, since the invalidating means outputs a signal for stopping the combustion to the combustion section, it is possible to reliably prevent hot water from flowing out of the hot water tap. Further, since the invalidating means outputs a signal for notifying that the input of the maximum opening adjustment means is invalidated to the notifying means, the user can recognize the fact and secure the safety.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram in which a combustion apparatus according to one embodiment of the present invention is applied to a gas water heater.

As shown in the figure, the gas water heater includes a water heater main body 1, a water supply pipe 3 for supplying water from the water source to the water heater main body 1, and heat exchange between the water heated in the water heater main body 1. It is constituted by a hot water supply pipe 5 for supplying the hot water to the hot water tap 11 via the heater 7.

The water supply pipe 3 is provided with an incoming water temperature sensor 23 for detecting the temperature Tc of water from the hot water supply source and a water amount sensor 25 for detecting the amount Q of water.
1 is provided with a tapping temperature sensor 29 for detecting the tapping temperature Th. Further, a temperature setter for setting the set temperature Ts by a remote controller (not shown) is provided.

The water heater body 1 also includes a fan 9 for supplying air required for combustion to the combustion section. Further, an igniter (not shown) necessary for igniting is provided at an upper portion of the burner 13. Burner 13
Is provided with a gas supply pipe 21 for supplying gas thereto, and the gas supply pipe 21 is provided with a proportional valve 17 for varying the amount of gas to be supplied and an original solenoid valve 19 for starting / stopping gas supply. Provided.

Further, based on the detected values Tc, Q, Th of the sensors 23, 25, 29 and the set temperature Ts, etc.
And a control unit 31 connected to a power cord for controlling the number of rotations, the opening of the proportional valve 17, and the opening and closing of the original solenoid valve 19. The controller 31 adjusts the maximum opening adjustment button 33 as the maximum opening adjustment means of the proportional valve 17, the minimum opening adjustment button 35 as the minimum opening adjustment means, and the opening of the proportional valve 17. Opening adjustment volume 37 and minimum opening adjustment volume 39 are provided.

FIG. 2 shows a control unit 3 according to an embodiment of the present invention.
1 is a control block diagram of FIG.

The maximum opening adjustment button 33 and the minimum opening adjustment button 35 send a signal to the proportional valve 17 via the invalidation means 43. Now, the invalidation means 43 is set to the maximum opening adjustment button 33.
When the maximum opening adjustment button 33 is turned on in a state where the signal of the minimum opening adjustment button 35 is received by the proportional valve 17, a signal instructing the proportional valve 17 to reach the maximum opening is sent. When the minimum opening adjustment button 35 is turned on, a signal instructing the proportional valve 17 to have the minimum opening is sent.

After the power is turned on, the invalidating means 43
According to 1, the signal of the maximum opening adjustment button 33 and the minimum opening adjustment button 35 is set to be received by the proportional valve 17 within a predetermined time. Further, after the power is turned on, the signals of the maximum opening adjustment button 33 and the minimum opening adjustment button 35 are not received by the proportional valve 17 after a predetermined time has elapsed by the timer 41.

Next, the operation of adjusting the opening of the proportional valve 17 will be described with reference to FIG.

It is determined by the timer 41 whether one hour has elapsed since the power was turned on (step S1). If not, it is determined whether the minimum opening adjustment button 35 is turned on (step S2). When the minimum opening adjustment button 35 is turned on in step S2, the proportional valve 17 becomes the minimum opening,
The opening is adjusted by the minimum opening adjustment volume 39 (step S3). If the minimum opening adjustment button 35 is off in step S2, it is determined whether the maximum opening adjustment button 33 is on (step S4). When the maximum opening adjustment button 33 is turned on in step S4, the proportional valve 17 reaches the maximum opening, and the opening is adjusted by the maximum opening adjustment volume 37 (step S3). If the maximum opening adjustment button 33 is off in step S4, the process returns to step S1 again. Also, in step S1, the power supply is turned on and the timer 41 is turned on.
After 1 hour, the maximum opening adjustment button 33 and the minimum opening adjustment button 35 are not accepted.

FIG. 4 is a view showing another embodiment of the operation of adjusting the opening degree of the proportional valve 17. In this embodiment, two maximum opening adjustment buttons (a first maximum opening adjustment button and a second maximum opening adjustment button) are provided.

It is determined whether or not the minimum opening adjustment button 35 has been turned on (step S6).
Is turned on, the proportional valve 17 has the minimum opening, and the opening is adjusted by the minimum opening adjustment volume 39 (step S7). If the minimum opening adjustment button 35 is off in step S6, it is determined whether the first maximum opening adjustment button is on (step S8). When the first maximum opening adjustment button is turned on in step S8, it is determined whether the second maximum opening adjustment button is turned on (step S9). When the second maximum opening adjustment button is turned on in step S9, the proportional valve 17 reaches the maximum opening, and the opening is adjusted by the maximum opening adjustment volume 37 (step S10). Step S
If the first maximum opening adjustment button is OFF in step 8, it is determined whether the second maximum opening adjustment button is ON (step S11). When the second maximum opening adjustment button is turned on in step S11, combustion is stopped (step S12), and the user is notified by a remote controller. If the second maximum opening adjustment button is off in step S11, the process returns to step S11.
Return to 6. If the second maximum opening adjustment button is off in step S9, combustion is stopped (step S1).
2) Notify the user with the remote control (step S1)
3).

FIG. 5 is a view showing another embodiment of the operation of adjusting the opening degree of the proportional valve 17.

It is determined whether or not the maximum opening adjustment button 33 has been turned on (step S14).
When 3 is turned on, it is determined whether or not the minimum opening adjustment button 35 has been turned on (step S15). When the minimum opening adjustment button 35 is turned on, the proportional valve 17 becomes the maximum opening, and the opening is adjusted by the maximum opening adjustment volume 37 (step S16). If it is determined in step S15 that the minimum opening adjustment button 35 is off, combustion is stopped (step S17), and the user is notified by a remote controller (step S15).
18). If the maximum opening adjustment button 33 is off at step S14, it is determined whether the minimum opening adjustment button 35 has been turned on (step S19). When the minimum opening adjustment button 35 is turned on, the proportional valve 17 becomes the minimum opening, and the opening is adjusted by the minimum opening adjustment volume 39 (step S20). If the minimum opening adjustment button 35 is off in step S20, the process returns to step S14.

FIG. 6 is a view showing another embodiment of the operation of adjusting the opening degree of the proportional valve 17.

It is determined whether or not the maximum opening adjustment button 33 has been turned on (step S21).
When the switch 3 is turned on, it is determined whether or not the minimum opening adjustment button 35 has been turned on within a predetermined time before that (step S22). If the minimum opening adjustment button 35 is turned on within a predetermined time, the proportional valve 17 reaches the maximum opening, and the opening is adjusted by the maximum opening adjustment volume 37 (step S).
23). In step S22, if the minimum opening adjustment button 35 is not turned on within a predetermined time, the combustion is stopped (step S24), and the user is notified by a remote controller (step S25). If the maximum opening adjustment button 33 is turned off in step S21, it is determined whether the minimum opening adjustment button 35 has been turned on (step S26). When the minimum opening adjustment button 35 is turned on, the proportional valve 17 becomes the minimum opening, and the opening is adjusted by the minimum opening adjustment volume 39 (step S27). If the minimum opening adjustment button 35 is off at step S20, the process returns to step S2.
Return to 1.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gas water heater according to one embodiment of the present invention.

FIG. 2 is a control block diagram of a control unit 31.

FIG. 3 is a diagram showing an embodiment of a valve opening adjustment operation of the proportional valve 17;

FIG. 4 is a view showing another embodiment of the operation of adjusting the valve opening of the proportional valve 17;

FIG. 5 is a diagram showing another embodiment of the valve opening adjustment operation of the proportional valve 17;

FIG. 6 is a diagram showing another embodiment of a valve opening adjustment operation of the proportional valve 17;

[Explanation of symbols]

 17: Proportional valve 31 ... Control unit 33 ... Maximum opening adjustment button 35 ... Minimum opening adjustment button 37 ... Maximum opening adjustment volume 39 ... Minimum opening adjustment volume 41 ... Timer 43 ... Invalidation means

Claims (6)

[Claims] 1. A combustion apparatus provided in a gas supply path and provided with a proportional valve that adjusts a combustion amount by varying an opening degree, wherein a maximum opening degree and a minimum opening degree of the proportional valve are set to an optimum opening degree. A combustion apparatus comprising: an opening adjusting means for adjusting; and an invalidating means that does not receive an input from the opening adjusting means after a predetermined time has elapsed after power-on. 2. A combustion apparatus provided in a gas supply path and provided with a proportional valve for adjusting a combustion amount by varying an opening degree, wherein the maximum opening degree of the proportional valve is adjusted to an optimal opening degree. A plurality of maximum opening adjustment units; a detection unit that detects the presence or absence of an output of all of the plurality of maximum opening adjustment units; and a start unit that starts adjusting the opening of the proportional valve by an output of the detection unit. A combustion device comprising: 3. A combustion device provided in a gas supply path and provided with a proportional valve for adjusting a combustion amount by varying an opening degree, wherein the maximum opening degree of the proportional valve is adjusted to an optimal opening degree. Maximum opening adjustment means; minimum opening adjustment means for adjusting the minimum opening of the proportional valve to an optimum opening; detection means for detecting the presence or absence of an output of the minimum opening adjustment means; A combustion unit comprising: invalidation means for invalidating an input of the maximum opening adjustment means by an output of the means. 4. The combustion apparatus according to claim 3, wherein the invalidating means is configured to input to the maximum opening adjustment means after a lapse of a predetermined time since the detection means detects the output of the minimum opening adjustment means. A combustion device characterized by disabling the combustion. 5. The combustion apparatus according to claim 1, wherein the invalidation unit outputs a signal for stopping combustion to a combustion unit. 6. The combustion apparatus according to claim 1, wherein the invalidating means outputs a signal notifying that input of the maximum opening adjustment means is invalidated to the notifying means. .