JPH0754183B2 - Combustor with temperature setting function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a temperature setter for setting an indoor temperature to a target temperature, including two switches, a switch for raising a set temperature and a switch for lowering the set temperature. Combustor with switch.

[Prior Art] As a combustor, for example, in a heating machine, there is one that controls a heating amount such as a combustion amount of a burner according to a temperature difference between an indoor temperature detected by a room temperature sensor and a set temperature. In this case, in a heating machine provided with two switches as a temperature setter for setting the set temperature, the set temperature is increased or decreased by one step each time each switch is operated. At this time, the set temperature display changes according to each change.

On the other hand, in the heater, when the detected indoor temperature rises to a predetermined temperature relative to the set temperature, the combustor of the burner is temporarily stopped, and when the indoor temperature falls to some extent, combustion of the burner is restarted. There is an intermittent heating type heater.

[Problems to be Solved by the Invention] In a heater equipped with a temperature setting device using such a switch, while it is easy to set the set temperature, for example, if a young person operates the switch, it is not known. When the temperature is changed, the room temperature becomes considerably high due to overheating, and fuel may be wasted during that time.

Further, in the intermittent heating type heater, the set temperature is changed when the room temperature and the set temperature are in a balanced state and the combustion is performed near the limit for continuing the combustion. When the set temperature is lowered, the room temperature becomes relatively higher than the set temperature, so that there arises a problem that the combustion of the burner is temporarily stopped.

In the present invention, when it is not necessary to change the set temperature, the set temperature cannot be changed even by operating a switch as a temperature setter, and the set temperature can be fixed according to the intention of the user. The purpose is to provide a container.

[Means for Solving the Problem] The present invention provides a set of temperature setting switches including a first switch for increasing and changing a set temperature and a second switch for decreasing and setting the set temperature. In a combustor provided with the first switch, an operation sequence determining means for determining whether or not the first switch is operated prior to the second switch when the second switch is operated;
Setting switch for stopping the change of the set temperature by the switch or the second switch to fix the set temperature, and the temperature change stopping unit includes the first switch and the second switch. When the switch and the switch are operated at the same time, when the operation sequence determining means determines that the first switch is operated prior to the second switch, the set temperature is fixed. Technical means.

[Operation] In the present invention, when the second switch for decreasing the set temperature is operated while the first switch for increasing the set temperature is operated, the change of the set temperature is stopped, and the setting at that time is stopped. Fixed at temperature.

Therefore, even if the first switch or the second switch is operated independently thereafter, the set temperature is not changed.

[Effects of the Invention] In the present invention, since the set temperature can be fixed, even if the switch of the temperature setting device is inadvertently operated, the set temperature will not be changed.

Further, since it is impossible to change the setting of the set temperature by using each switch for setting the set temperature, it is not necessary to provide a separate switch.

Furthermore, when performing the operation to fix the set temperature,
Since the first switch for increasing and changing the set temperature is operated prior to the second switch, the room temperature does not become relatively higher than the set temperature. Even in a combustor in which heating is stopped in accordance with a temperature difference, there is no problem such as heating being stopped when the set temperature is fixed.

EXAMPLES Next, the present invention will be described based on examples.

A gas warm air heater 1 of the present embodiment whose schematic configuration is shown in FIG.
The indoor air is sucked by the operation of the convection fan 13 from the suction port 12 provided with the filter 11 of the casing 10a forming the indoor air circulation path 10, and a part of the indoor air is sucked by the air guide tube 14 into the fuel mixing chamber 15. Be led to.

Further, a nozzle 21 for ejecting the fuel gas supplied by the fuel supply pipe 22 is arranged upstream of the fuel mixing chamber 15,
The fuel gas becomes a mixture in the fuel mixing chamber 15 and burns in the burner 16.

The combustion gas is mixed with air in the air mixing chamber 17 in the casing 10a and blown out from the warm air outlet 18.

On the other hand, the fuel supply pipe 22 is provided as the fuel supply passage 20, and the fuel supply pipe 22 includes solenoid valves 23 and 24, a governor 25 for maintaining a constant fuel gas pressure, and a fuel supply amount adjustment. A proportional valve 26 is provided.

The proportional valve 26 is connected to the upstream side and the downstream side by a bypass 28 having a gas amount adjusting screw 27.

The gas warm air heater 1 configured as described above is started and stopped by the control device 40 provided in the main body (not shown), and the heating amount is controlled.

The control device 40 includes an operation switch 31 for instructing start and stop of the operation of the gas warm air heater 1, and a temperature setter 32 for setting a desired room temperature as an up switch for increasing or changing the set temperature. A switch 32a, a down switch 32b for lowering the set temperature, and a timer mechanism (not shown) for starting automatic operation are provided as operating parts.

Here, normally open push button switches are used for the switches 31, 32a, and 32b.

Further, outside the casing 10a near the suction port 12, a thermistor 33 that detects the indoor temperature is provided.
In the vicinity of 6, a thermocouple 34 for detecting the combustion temperature,
An ignition electrode 35 is provided.

The control device 40 includes a microcomputer having various input / output circuits (hereinafter referred to as “microcomputer”) and a drive circuit for driving each part of the gas warm air heater 1 by the microcomputer, and a power plug (not shown). Is connected to an electric power line, power is automatically supplied. As shown in FIG. 1, the ignition control unit 41, the temperature setting unit 42, the temperature control unit 43,
It is composed of each functional unit of the fan control unit 44.

When the ignition control unit 41 detects a push operation of the operation switch 31, the ignition control unit 41 reversibly performs operation start control and operation stop control in a predetermined sequence in response to the detection.

The temperature setting unit 42 is for selectively setting from among a plurality of predetermined set value groups according to the operating state of each switch 32a, 32b of the temperature setting device 32, normally, each switch 32a, Every time 32b is operated, the set temperature is changed by one step, that is, increase or decrease.

Especially, here, each switch 32 is selected according to the intention of the user.
When a predetermined operation is performed on a and 32b, the set temperature can be fixed so that the set temperature cannot be changed even if each switch 32a and 32b is operated. The temperature setting unit 42 is provided with an operation detection unit 45 and a fixed unit 46 that detect the operation states of the switches 32a and 32b,
In particular, the operation detection unit 45 has an order determination unit 45a that determines the operation order of the switches 32a and 32b.

The control operation of the microcomputer for temperature setting in the temperature setting unit 42 will be described below with reference to FIGS. 3 and 4.

When a power plug (not shown) is connected to the power line and power is supplied to the microcomputer, the up switch
An up switch ON flag that becomes "1" when it is detected that 32a is closed (hereinafter referred to as "up flag"), and a down switch that becomes "1" when it is detected that the down switch 32b is closed. An on-flag (hereinafter referred to as "down flag") is set to "1", and when a 0.5 second timer for measuring the time when both the up switch 32a and the down switch 32b are on is "1". The 0.5-second timer flag (hereinafter referred to as the "timer flag"), "1" when a reversible set temperature fixing operation or set temperature fixing releasing operation is performed.
Then, the reversing operation flags that become “0” when the reversing operation is possible are set to “0” (step 1), and subsequently it is determined whether or not the operation detecting section 45 detects the ON operation of the up switch 32a. To do.

When it is detected that the up switch 32a has been operated and turned on (YES in step 2), it is determined by the up flag whether or not the detection is continued.

If the up flag is "1" (YES in step 3), it means that the up switch 32a is continuously turned on, and therefore the process proceeds to step 8 and the on operation of the down switch 32b is detected. Whether or not it is determined.

When the up flag is "0" (NO in step 3), it indicates that the up switch 32a is once turned off and then turned on, and the user newly operates the up switch 32a. This is the case.

At this time, it is determined whether or not the set temperature is fixed and the change of the set temperature is not permitted, and when the lock flag described later is “0”, which indicates that the set temperature is not fixed, (NO in step 4), the set temperature is increased by one step (step 5), the up flag is set to "1" (step 6), and then the process proceeds to step 8.

When the lock flag is "1", indicating that the set temperature is fixed (YES in step 4), the increase of the set temperature in step 5 is not changed, and the process proceeds to step 6.

On the other hand, when it is detected that the up switch 32a is not operated and is off (NO in step 2), the up flag is set to "0" (step 7), and then the process proceeds to step 8.

When it is detected that the down switch 32b is operated and turned on (YES in step 8), it is determined by the down flag whether or not the detection is continued.

When the down flag is "0" (NO in step 9), it indicates that the down switch 32b is once turned off and then turned on, and the user newly operates the down switch 32b. This is the case.

At this time, it is determined whether or not the set temperature is fixed and the change of the set temperature is not permitted, and when the lock flag described later is “0”, which indicates that the set temperature is not fixed, (NO in step 10), the set temperature is decreased by one step (step 11), the down flag is set to "1" (step 12), and then the process proceeds to step 17.

When the lock flag is "1" and the set temperature is fixed (YES in step 10), the set temperature is not changed to be lowered in step 11, and the process proceeds to step 12.

When the down flag is "1" (YES in step 9), it is detected that the down switch 32b is continuously turned on.

Here, when performing the fixing operation or the fixing release operation of the set temperature, the up switch 32a and the down switch 32b are simultaneously turned on, and in that case, regarding the operation order of the up switch 32a and the down switch 32b, The condition is that the up switch 32a is operated prior to the down switch 32b.

Therefore, when it is detected that the down switch 32b is continuously turned on, whether or not the up switch 32a has already been turned on is determined by the up flag, and the up flag is "0". In this case (YES in step 13), the up switch 32a is not continuously turned on, and the down switch 32b is not operated.
When the switch is turned on prior to the up switch 32a and the condition is not satisfied, the condition flag is set to "0" to indicate that (step 14).

If the up flag is "1" (NO in step 13), the condition can be satisfied even when the up switch 32a is turned on prior to the down switch 32b, and therefore the process directly proceeds to step 17. Transition.

On the other hand, when it is detected that the down switch 32b is not operated and is off (NO in step 8), the down flag is set to "0" (step 15), and at this time, the up switch 32a precedes. The condition flag is set to "1" to indicate that the condition for performing the fixing operation and the fixing releasing operation of the set temperature can be satisfied if the ON operation is performed.
(Step 16), and then the process proceeds to step 17.

In step 17, it is determined whether or not the condition regarding the operation order of the up switch 32a and the down switch 32b is satisfied, and if the condition flag is "0" and the condition is not satisfied (step 17 At NO),
The process proceeds to step 2 without performing the following steps regarding the fixing operation and the fixing releasing operation of the set temperature.

When the condition flag is "1" and the condition regarding the operation order of each switch is satisfied (YES in step 17), it is determined whether or not the up switch 32a is turned on, and the up flag is " 1 ”and the up switch 32a is turned on (step 18).
In YES), it is continuously determined whether or not the down switch 32b is turned on.

When the up flag is "0" (in step 18
NO) or the down flag is "0" (NO in step 19), the up switch 32a and the down switch 32b are not turned on at the same time, and either one of them is not turned on. Therefore, neither the fixed temperature fixing operation nor the fixed temperature fixing operation is performed. In this case, if the up switch 32a and the down switch 32b are simultaneously turned on according to the conditions thereafter, the reversing operation flag is set to indicate that the fixing operation and the fixing releasing operation of the set temperature can be reversed. 0 "(step 20), and then the process proceeds to step 2.

The up flag is "1" (YH in step 18)
S) and the down flag is "1" (step 19)
Is YES), it is determined whether or not each inversion operation of the fixed temperature fixing operation or the fixed temperature releasing operation is permitted, and when the inversion operation flag is "1" and the inversion operation is performed. (NO in step 21), step 2
Move to.

If the reversing operation flag is "0" (YES in step 21), it means that the reversing operation is possible.
The inversion operation is performed according to the following procedure.

Here, in order to perform each operation only when the ON operation of each switch 32a, 32b for the fixing operation or the releasing operation of the set temperature is continued for 0.5 seconds, the timer flag indicating the operating state of the 0.5 second timer Based on the above, it is determined whether or not the timer flag is "1". If the timer flag is "0" (NO in step 22), the 0.5 second timer starts counting (step 23) The timer flag is set to "1" (step 24), and the process proceeds to step 2.

If the timer flag is "1" in step 22 (YES), it is determined whether or not the time counting of the 0.5 second timer has ended. If the time counting has not ended (NO in step 25), step 2 , And repeat the above steps until the time measurement is completed.

If the 0.5 second timer has finished counting (step 2
(YES in 5), it is determined whether the lock flag indicating that the set temperature is fixed is "1".

If the lock flag is "1" (YES in step 26), the lock of the set temperature is released because it is already locked and this operation is for releasing the lock of the set temperature ( At the same time, the lock flag is set to "0" to indicate that the set temperature is not fixed (step 28).

If the lock flag is "0" (NO in step 26), the set temperature has not been fixed, and the current operation is to fix the set temperature. Therefore, the set temperature is fixed. At the same time, the lock flag is set to "1" to indicate that the set temperature is fixed (step 30).

After performing each operation in step 28 or step 30, the inversion operation flag is set to "1" to indicate that each operation is performed (step 31), and the process proceeds to step 2.

In the temperature setting unit 42, by performing the above control operation by the microcomputer, the up switch 32a is turned on in advance, and while maintaining that state, the down switch 32b is turned on, and the switches 32a and 32b are simultaneously turned on. If the ON time continues for 0.5 seconds, the set temperature is fixed, and even if the switches 32a and 32b are individually turned on, the set temperature cannot be changed.

Further, at this time, the start operation is also fixed with respect to the operation start, the operation start operation corresponding to the operation switch 31 cannot be performed, and once the operation is stopped, the switches 32a, 3
The operation will not start until the set temperature is released by 2b.

The temperature control unit 43 determines the heating state of the burner 16 based on the temperature difference between the set temperature set by the temperature setting unit 42 and the room temperature detected by the thermistor 33, and controls the proportional valve 26 based on that. Then, the combustion amount of the burner 16 is adjusted.

The fan control unit 44 controls the convection fan 13 and adjusts the convection flow rate of the indoor air based on the output voltage of the thermocouple 34, which is obtained by amplifying the electromotive force of the thermocouple 34 heated by the burner 16 by an amplifier (not shown). To do.

Further, depending on the control operation of the ignition control unit 41, pre-purge or post-purge is performed.

During combustion, in order to prevent oxygen-deficient combustion, it is determined whether or not there is a combustion abnormality based on the output voltage of the thermocouple 34, and the thermocouple 34 does not burn due to oxygen-deficient combustion or misfire.
When the output voltage of is decreased, the solenoid valves 23 and 24 are closed to stop the fuel supply and stop the operation.

In the present embodiment, when the set temperature is fixed by the fixing unit 46, acceptance of active operations by all the switches except the operation for releasing the fixation is stopped.
As a result, for example, with respect to the operation switch 31, an operation for detecting an OFF operation for stopping the operation is detected, but an operation for starting the operation is not detected.

Next, the operation of the set temperature in the gas warm air heater 1 of the present embodiment having the above configuration will be described.

When the operation switch 31 is turned on, the operation is started, the ignition operation is performed in a predetermined sequence, the burner 16 is ignited after the pre-purge by the convection fan 13, and the combustion is started.

When the user operates the switches 32a and 32b of the temperature setting device 32 during operation, the set temperature is changed.

After setting the desired temperature to the set temperature, the up switch 32a
When the down switch 32b is continuously turned on after the switch is turned on, and the switches 32a and 32b are simultaneously turned on for 0.5 seconds, the set temperature is fixed.

As a result, even if the up switch 32a or the down switch 32b is individually turned on thereafter, the set temperature is not changed at all.

Also, in this state, another additional function switch (not shown)
Since the acceptance of is fixed, the status does not change.

Further, in this state, when the operation is stopped by the operation switch 31, the fire extinguishing control is performed in a predetermined sequence.

After that, even if the user tries to start the operation with the operation switch 31, the operation is not started because the operation for starting the operation is fixed by the fixing portion 46.

After that, when the user simultaneously operates the up switch 32a and the down switch 32b to release the fixation, the fixation of the set temperature is released and the fixation of the operation start operation is also released, and the operation can be started. , The set temperature can be changed.

As described above, in the present invention, since the set temperature can be fixed by operating the temperature setting switch in a predetermined order, even if a child or the like accidentally operates the temperature setting switch, the set temperature is set. Is never changed. Therefore, a stable operating state can be obtained.

In the present embodiment, the hot air heater that mixes the combustion gas with the room air and blows it out into the room is shown, but the combustion air is sucked in from the outside to exhaust the combustion gas to the outside, and the heat exchanged hot air is used. A forced air supply / exhaust type (FF type) hot air heater that blows air into the room,
It may be a water heater.

The fuel may be petroleum.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a functional configuration of a control device for a gas hot air heater according to an embodiment of the present invention, and FIG. 2 is a configuration diagram showing a schematic configuration of a gas hot air heater according to the present embodiment. 3 and 4 are flow charts showing temperature setting control by the control device of this embodiment. In the figure, 1 ... Gas warm air heater (combustor), 16 ... Burner, 32 ... Temperature setter (temperature setter), 32a ... Up switch (first switch), 32b ... Down switch (Second switch), 45a ... Sequence determination section (operation sequence determination means), 46 ... Fixed section (set temperature fixing means).

Claims (1)

[Claims] 1. A combustor provided with a set of temperature setting switches, which comprises a first switch for increasing and changing a set temperature and a second switch for decreasing and setting the set temperature. An operation sequence determining means for determining whether or not the first switch is operated prior to the second switch when the second switch is operated; and the first switch or the second switch. And a set temperature fixing means for fixing the set temperature by stopping the change of the set temperature by the first switch and the second switch.
When the switch and the switch of
When it is determined by the operation order determination means that the first switch has been operated prior to the switch
A combustor with a temperature setting function, characterized in that the set temperature is fixed.