JP2887946B2 - Forced water supply / exhaust water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a forced air supply and exhaust type water heater.

[0002]

2. Description of the Related Art Conventionally, in a forced water supply / exhaust type water heater for indoor use, in a pre-purge before ignition and a post-purge after extinguishing, a pre-purge rotation speed by a blower fan,
The post-purge rotation speed was set to a relatively low constant rotation speed.

[0003]

However, in the above-mentioned conventional water heater, when the combustion is extinguished in the middle of a strong wind or the like, incompletely combusted gas tends to remain in the exhaust stack or the vessel and explodes upon re-ignition. There was a problem of ignition. This problem is particularly important for use on high floors where strong winds are likely to blow. And the extinction on the way is mainly wind
Because of the blowout
During the time period including the time when the water heater is
In many cases, the wind pressure is applied as a counter pressure. Follow
Thus, as in the invention disclosed in Japanese Utility Model Publication No. 3-3806,
In addition, simply increase the air continuation time
In fact, gas exhaust does not actually progress just by crushing.

Accordingly, the present invention solves the above-mentioned drawbacks of the prior art, and can be used in high winds, such as on high floors.
Explosion ignition may not occur when re-ignition after quenching
An object of the present invention to provide the stomach Mandatory supply and exhaust type water heater.

[0005]

To achieve the above object, according to an aspect of, forced air supply and exhaust-type water heater of the present invention, prior to ignition,
Also a forced air supply and exhaust-type water heater to perform a purge operation for replacing the Utsuwanai air with outside air after extinguishing, burn out
In the purge operation of the air takes place after the flame failure by flames are blown by the wind or the like from the other points
The blower blows more than in the case of purging operation due to fire or fire extinguishing.
The feature is that it is designed to be performed with increased ability .

[0006]

[Function] Due to blow-off due to blowing of wind from the outside
However, in the present invention, in the air purging operation performed after the combustion has been extinguished ,
Is less than the other purge and ignition operations.
Since the blower was designed to increase the blowing capacity, incompletely combusted gas remaining in the exhaust stack and inside the vessel could blow air.
Under a situation where back pressure etc.
Are also strongly discharged out of the stack. Therefore, even at the time of re-ignition after quenching on the way, the inside of the chamber is sufficiently replaced with fresh air, thereby preventing explosion and ignition.

[0007]

FIG. 1 is a sectional view of a water heater according to an embodiment of the present invention. FIG. 2 is a control flow chart showing a first example of an ignition operation and a post-extinguishing operation during hot water supply.
6 is a control flowchart showing a second example of the ignition operation and the operation after halfway extinction when hot water is used.

A hot water supply can 10 and a bath can 20 are provided in a case 1. The cans 10 for hot water and the cans 20 for bath are respectively provided in the hot water supply can 10 and the bath can 20.
2, 22, fuel supply valves 13, 23, igniters 14, 24,
Heat exchangers 15 and 25 are provided. An exhaust pipe 30 common to the cans 10 and 20 and an air supply pipe 40 provided in the case 1 are extended to the outside and are desired outside the wall A of a house or the like. Reference numeral 50 denotes a controller with a built-in microcomputer, which receives a command from a remote controller or the like (not shown) and obtains information from sensors of various parts of the appliance.
A predetermined operation is instructed to each part of the appliance. Reference numeral 60 denotes a wind pressure switch mounted in the exhaust pipe 30.

Next, with reference to FIG. 2, a first control example of the ignition operation and the operation after the flame quenching during the use of hot water by the controller 50 will be described. The operation switch is turned on by a remote controller (not shown) (step 10).
1) When the hot water supply curl (not shown) is opened and the minimum working water flows through the hot water supply pipe, a water flow sensor (not shown) is turned on (step 102), and an ON signal is input to the controller 50 to start an ignition sequence. You.
First, the controller 50 turns on the blower fan 11 (step 103). With this , the blower fan 1 which is a blower
1 starts rotation, and the number of rotations gradually increases. Until the rotation speed reaches a predetermined relatively low prepurge rotation speed, it is defined as a pre-purge operation time before ignition. When a rotation speed sensor (not shown) attached to the blower fan 11 detects the pre-purge rotation speed (step 104), the controller 50 turns on the igniter 14 and opens the fuel supply valve 13 (step 105). Thereby, the burner 12 is ignited and the combustion is started. After the ignition, the blower fan 11 further increases the rotation speed to a steady rotation speed.

However , when wind or the like enters from the exhaust stack 30 during the combustion to blow out the flame (step 1).
06), a flame sensor (not shown) detects the extinction and inputs this to the controller 50. This allows the controller 5
0 indicates that the fuel supply valve 13 is closed (step 107),
Further, the number of re-ignitions so far is a certain number, for example, 2
It is determined whether the number is less than or equal to the number of times (step 108). If the number of times exceeds 2, the operation is stopped for safety (step 10).
9). If the number of re-ignitions is two or less, the controller 50 once sets the rotation speed of the blower fan 11 to the maximum as the blower capacity of the blower (step 110). As a result, the blowing capacity of the blower is
As compared with the operation , the exhaust gas 30 and the incomplete combustion gas in the vessel may be under a condition in which a back pressure is applied from the outside.
In this case, the air is strongly purged (exhausted), and the inside of the vessel is replaced with fresh air. After performing the purging for a predetermined time (an appropriate time for purging the exhaust stack and the inside of the vessel, for example, less than several tens of seconds) (step 111), the controller 50 turns on the operation switch and the water amount switch. (Steps 112 and 113), the reignition sequence is started. When the operation switch is off, and when the water amount sensor is off, the operation is stopped (step 1).
09).

The re-ignition sequence begins with the controller 50
As a result, the rotation speed of the blower fan 11 is set to the prepurge rotation speed (step 114). When the rotation speed of the fan 11 decreases to the prepurge rotation speed (step 115 ), the igniter 14 is turned on again to supply the fuel. The valve 13 is opened again (step 116). Thereby, the burner 12
Reignites.

Next, a description will be given of a second control example of the ignition operation and the operation after halfway extinction in hot water supply using the wind pressure switch 60 with reference to FIG. The operation switch is turned on by a remote controller (not shown) or the like (step 2).
01), a water amount sensor (not shown) is turned on (step 20)
2) By doing so, the ignition sequence is started. First, the controller 50 turns on the blower fan 11 (step 203). As a result, the blower fan 11 starts rotating, and the number of revolutions gradually increases. Until the rotation speed reaches a predetermined relatively low prepurge rotation speed, it is defined as a pre-purge operation time before ignition. The pre-purge rotation speed differs depending on whether the wind pressure switch 60 provided in the exhaust pipe 30 is on or off. That is, when the air pressure switch 60 off state reverse pressure is not I given above Kuwawa <br/> from the outside with respect to the vessel, up
The repurge rotation speed is set to a normal value X, and when reaching the value X, the igniter 14 is turned on and the fuel supply valve 13 is opened (steps 204, 205, 207). On the other hand, in the case where the wind pressure switch 60 is on, in which the external back pressure is applied to the inside of the vessel over a certain level , the prepurge rotation speed is set to a value larger than the normal value X by an appropriate value α, and this value X + α
Is reached, the igniter 14 is turned on and the fuel supply valve 13 is opened (steps 204, 206, 207). Thereby, the burner 12 is ignited and the combustion is started. After the ignition, the blower fan 11 further increases the rotation speed to a steady rotation speed.

During the combustion, when wind or the like enters through the exhaust pipe 30 to blow out the flame (step 208), a flame sensor (not shown) detects the flame extinction and inputs this to the controller 50. Accordingly, the controller 50 closes the fuel supply valve 13 (step 209), and determines whether the number of re-ignitions so far is a certain number, for example, two or less (step 210). Is
The operation is stopped for safety (step 211). If the number of reignitions is two or less, the controller 50
Sets the rotation speed of the blower fan 11 to the maximum once (step 213), on condition that the wind pressure switch 60 is off ( the back pressure equal to or more than a predetermined value is not generated) (step 212). As a result, incomplete combustion gas in the exhaust stack 30 and the inside of the vessel is reliably and strongly purged (exhausted), and the inside of the vessel is replaced with fresh air. After performing the purging for a certain period of time (a period appropriate for purging the exhaust stack and the inside of the vessel, for example, less than several tens of seconds) (step 21)
4), the controller 50 presupposes that the operation switch and the water amount switch are turned on (steps 215 and 215).
16) Start reignition sequence. When the operation switch is off, and when the water amount sensor is off, the operation is stopped (step 211).

The reignition sequence begins with the controller 50
The rotation speed of the blower fan 11 is set to the pre-purge rotation speed X (step 217), whereby the rotation speed of the fan 11 is reduced to the pre-purge rotation speed (step 2).
18) After waiting for the wind pressure switch 60 to be turned off (step 219), the igniter 14 is turned on again, and the fuel supply valve 1 is turned on.
3 is reopened (step 220). This ensures that the burner 12 reignites with little back pressure.

Purging after the above-mentioned flame-out (Step 1)
In 10,213) has been set the fan 11 rotational speed to a maximum value, not necessarily to the maximum value, the blower
As the capacity, an appropriate rotation speed higher than the prepurge rotation speed can be adopted. Back pressure due to external wind, etc.
In a state in which is applied, it is preferred for larger rotation speed to reliably discharged course residual gas. Further, in each of the above-described embodiments, the operation when using hot water supply has been described, but the control operation for re-ignition when using bath heating using bath can 20 is also the same.

[0016]

According to the present invention the above configuration consists of action, according to the forced air supply and exhaust-type water heater according to claim 1, combustion outer
In the purge operation of the air takes place after the flame failure by flames are blown by the wind or the like from the other points
The blower blows more than in the case of purging operation due to fire or fire extinguishing.
Because it is configured to increase the ability, it is necessary to blow wind etc.
Even in situations where back pressure is often applied,
Strongly exhausts incompletely combusted gas remaining in the stack and vessel.
It can be discharged outside the cylinder. Therefore, after extinction
When igniting, be sure to replace the inside with fresh air.
To prevent explosion and ignition and ensure smooth re-ignition.
It can be carried out.

[Brief description of the drawings]

FIG. 1 is a sectional configuration diagram of a water heater showing an embodiment of the present invention.

FIG. 2 is a control flowchart showing a first example of an ignition operation and an operation after halfway extinction in hot water supply use.

FIG. 3 is a control flowchart showing a second example of the ignition operation and the operation after halfway extinction in hot water supply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 10 Hot-water supply can body 11, 21 Blower fan 12, 22 Burner 13, 23 Fuel supply valve 14, 24 Ignition device 15, 25 Heat exchanger 30 Exhaust cylinder 40 Air cylinder 50 Controller 60 Wind pressure switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-55616 (JP, A) JUNHEI 3-3806 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23N 5/20 101

Claims (1)

(57) [Claims] Prior to 1. A spark and a forced supply and exhaust-type water heater to perform a purge operation for replacing the Utsuwanai air with outside air after extinguishing, flame by the wind or the like from outside the combustion
In the air purging operation performed after the flame is extinguished by blowing out, the purging operation accompanying other ignition and fire extinguishing is performed.
A configuration that increases the blowing capacity of the blower,
Forced air supply and exhaust-type water heater characterized in that the.