JP2758336B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus of the type in which adjustment value data of a control circuit is stored in a nonvolatile semiconductor memory.

[0002]

2. Description of the Related Art For example, in a hot air heater, a DIP switch and a semi-fixed VR are conventionally used for adjusting a misfire determination level, adjusting a fan speed, and adjusting a proportional valve current. However, since the DIP switch usually has only a capacity of about four to seven circuits, it is not possible to finely adjust the adjustment value. If many DIP switches are used side by side, a large space is required and the cost of parts is increased. The adjustment value of the semi-fixed VR changes when the sliding piece moves due to vibration or the like.

[0003]

Accordingly, the inventors have prototyped a warm air heater in which each set value such as a fan current, a proportional valve current, and a misfire determination level is stored in a semiconductor nonvolatile memory (E ² PROM). did. However, in the warm air heater, when the adjustment operator adjusts the adjustment value by the adjustment means, and the writing circuit converts the adjustment value into adjustment value data and stores it in the E ² PROM, the previous data is erased. It takes several hundred milliseconds to write new data, but if the operator accidentally unplugs the plug from the outlet, the operating power to the E ² PROM is cut off, and if the plug is plugged in again,
A phenomenon occurs in which abnormal data (no data or random values) is written to the storage area in the E ² PROM, and the warm air heater enters an abnormal operation state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combustion apparatus in which adjustment value data is stored in a nonvolatile semiconductor memory so that the adjustment value data can be reliably stored in the nonvolatile semiconductor memory during adjustment.

[0005]

In order to solve the above-mentioned problems,
The present invention provides a safety circuit, an adjustment unit for adjusting an adjustment value of a control circuit for controlling a combustion actuator, an informing unit for displaying the adjustment value adjusted by the adjustment unit on a display, A non-volatile semiconductor rewritable memory, a write circuit that converts an adjustment value adjusted by the adjustment unit into adjustment value data and stores the adjustment value data in the semiconductor nonvolatile memory, and an adjustment value data stored in the semiconductor nonvolatile memory. A readout circuit for reading and converting the readout value into an adjustment value of the safety circuit or the control circuit.
The notifying unit, when the writing circuit writes the adjustment value data to the semiconductor nonvolatile memory, flashes the adjustment value displayed on the display to notify that the writing to the semiconductor nonvolatile memory is being performed. Configuration was adopted.

[0006]

The adjustment operator adjusts the adjustment values of the safety circuit and the control circuit at the time of adjustment. The notifying unit displays the adjustment value adjusted by the adjusting unit on a display. The writing circuit converts the adjustment value adjusted by the adjustment unit into adjustment value data, stores the adjustment value data in the semiconductor nonvolatile memory, and changes the set value data. The notifying means flashes the adjustment value displayed on the display when writing the adjustment value data to the semiconductor nonvolatile memory to notify that the writing is being performed to the semiconductor nonvolatile memory. The readout circuit reads out the adjustment value data stored in the semiconductor nonvolatile memory and converts it to an adjustment value for the safety circuit and the control circuit.
The control circuit controls the combustion actuator using the adjustment value, and the safety circuit monitors safety using the adjustment value.

[0007]

When the adjustment value data is written to the semiconductor nonvolatile memory, the adjustment value being displayed on the display blinks so that the notification means notifies that the writing to the semiconductor nonvolatile memory is in progress. The adjustment worker pays attention to the adjustment / writing operation, and the interruption of the writing operation can be effectively prevented. Also, at the time of writing, the displayed adjustment value is blinked to notify the user, so that reconfirmation of the adjusted value can be reminded, and that the displayed adjustment value is being reported to the user without fail. can do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the gas warm air heater R includes a gas combustor 1 that burns at a first to eighth speed combustion level, a thermocouple 2 that detects abnormal combustion, and a gas amount supplied to the gas combustor 1. , A convection fan 4 for supplying combustion air to the gas combustor 1, and a control unit 5 for controlling the proportional valve 3, the convection fan 4, and the like. Also, 6
Is the heater housing, 61 is the indoor air k and the gas combustor 1
611 is a thermistor for detecting room temperature, and 7 is a gas pipe.

The gas combustor 1 includes a ceramic combustion plate 1.
1, a combustion cylinder 12 having a sparker sp and a thermocouple 2 disposed therein, a gas g ejected from a nozzle n disposed downstream of the air guide path 61, and indoor air k guided by the air guide path 61. And a mixing chamber 13.

The thermocouple 2 is disposed close to the upper surface of the combustion plate 11, is exposed to a combustion flame, and sends out an electric output according to the combustion state of the gas combustor 1.

[0011] The proportional valve 3 is provided with a gas g
This is a valve for adjusting the amount of gas, and the amount of passing gas increases in proportion to the amount of electricity.

The convection fan 4 includes an impeller 41 pivotally mounted in a duct 67 downstream of the gas combustor 1, and an impeller 41.
And a motor 42 for driving the motor.

The gas pipe 7 includes solenoid valves 71 and 72, a proportional valve 3
Are arranged in order from the upstream side and are connected to the nozzle n. still,
The proportional valve 3 has a gas governor for keeping the secondary gas pressure constant, and the gas governor is provided with a gas amount adjusting screw for adjusting the first-speed combustion level.

The heater housing 6 is provided with suction ports 64 and 65 for room air k used for mixing and combustion at an upper portion on a back surface thereof.
An outlet 66 is provided at the lower part of the front surface. Above inlet 6
Filters 4 and 65 for removing dust in the room are detachably provided in the doors 4 and 65, and a louver 661 for changing a blowing direction of the hot air w is attached to the outlet 66. In addition, 6
Reference numeral 7 denotes a duct that connects the suction port 65 and the air outlet 66.

As shown in FIG. 2, a control unit 5 having a microcomputer (not shown) includes a combustion amount determination circuit 51, a proportional valve drive circuit 52, a fan control circuit 53, a misfire detection circuit 54, and an adjustment mode control circuit. 55, E ² PRO
M56, a write circuit 561, a read circuit 562, an operation control circuit 57, and a notification circuit 58 are provided.

In the normal operation mode, the combustion amount determination circuit 51 determines the difference between the set temperature set by the temperature setting switches (+) (-) 511 and 512 and the room temperature detected by the thermistor 510, the save switch 513 Switch 51
The combustion level (first speed to eighth speed) is determined based on the pressing state of No. 4. When the mode is shifted to the proportional valve current adjustment and storage mode, first, the combustion level is fixed to the first speed for adjusting the gas amount adjusting screw, and after the save switch 513 is pressed, the combustion level is fixed to the seventh speed. Furthermore, when shifting to the fan speed adjustment and storage mode, first, the combustion level is fixed to first speed,
After pressing the quick switch 514, the combustion level is fixed at the seventh speed.

The proportional valve drive circuit 52 determines each proportional valve current amount at the first to sixth and eighth speeds based on the proportional valve current value at the seventh speed read from the E ² PROM 56 by the read circuit 562. Then, in the normal operation mode, a proportional valve current having a magnitude corresponding to the combustion level determined by the combustion amount determination circuit 51 flows through the proportional valve 3.

The fan control circuit 53 determines the amount of fan current in the second to sixth and eighth speeds based on the respective fan current values in the first speed and seventh speed read from the E ² PROM 56 by the read circuit 562. Then, in the normal operation mode, a fan current having a magnitude corresponding to the combustion level determined by the combustion amount determination circuit 51 is supplied to the motor 42.

The misfire detection circuit 54, which is a safety circuit, is provided when the intensity of the electric output transmitted by the thermocouple 2 does not reach the Lo-side / Hi-side misfire determination level set for each combustion level group, which will be described later. , It is determined that the gas combustor 1 is in an abnormal combustion state (oxygen-deficient combustion, misfire), and the operation control circuit 5
7, a misfire detection signal is transmitted.

The adjustment mode control circuit 55 simultaneously presses a test switch 551 and a write switch 555 (a normally open push switch that is closed only when any one of them is pressed) disposed on the substrate of the control unit 5 (0. (3 seconds or more), the gas warm air heater R shifts to the misfire determination level adjustment and storage mode. Further, by pressing only an arbitrary switch, for example, only the save switch 513, the proportional valve current adjustment and storage mode [ 1st speed pressure adjustment, 7th speed pressure adjustment] → fan rotation speed adjustment / storage mode [Lo side, Hi side] → misfire determination level adjustment / storage mode → proportional valve current adjustment / storage mode. Press the save switch 513 (step s9,
When the adjustment value data relating to the adjusted adjustment value is written into the E ² PROM 56 by “YES” at 22, 32 and 40), as shown in FIG. During a predetermined time from the start of pressing (1S in this embodiment), the display is turned on and off to alert the adjustment operator.

In the misfire determination level adjustment and storage mode, the temperature setting switches (+) (-) 511 and 512 (both are arranged on the operation panel) and the adjustment mode control circuit 55 are in the first to second and third speeds. Adjust the Lo-side / Hi-side misfire determination level for each of the combustion level groups up to the eighth speed. Also, in the proportional valve current adjustment and storage mode, the temperature setting switch (+)
The (-) 511 and 512 and the adjustment mode control circuit 55 adjust the proportional valve current at the seventh combustion level (1 mA unit). Further, in the fan rotation speed adjustment and storage mode, the temperature setting switches (+) (-) 511, 512 and the adjustment mode control circuit 55 adjust the fan current (1 mA unit) at the first speed and the seventh speed.

E ² PROM 56 having a capacity of several k bits
Discloses that a floating gate is formed in an insulator of SiO ₂ , and charges are stored in the gate using a tunnel effect to store adjustment value data. It should be noted that the number of rewritable times is 10 ⁵ times or more and the retention period is 10 years or more.
The adjustment value data stored in the E ² PROM 56 includes those relating to the Lo-side / Hi-side misfire determination level,
It relates to the proportional valve current at the seventh speed, the fan current at the first speed and the seventh speed, and the like.

The write circuit 561 is activated by pressing the save switch 513 in each adjustment mode after each adjustment value is determined, and the temperature setting switches (+) (-) 511, 5
The Lo-side / Hi-side misfire determination level, the adjustment value of the proportional valve current at the seventh speed, or the adjustment value of the fan current of the convection fan 4 at the first speed and the seventh speed, adjusted by 12 etc. This is a circuit that converts the data and stores it in the E ² PROM 56.

The read circuit 562 reads each adjustment value data written in the E ² PROM 56 as needed, and
The values are converted into the i-side misfire determination level, the adjustment value of the proportional valve current, and the fan adjustment current value, and these adjustment value signals are sent to the misfire detection circuit 54, the proportional valve drive circuit 52, and the fan control circuit 53.

The operation control circuit 57 includes an operation switch 571
Is turned on, and the mode shifts to the normal operation mode, the solenoid valves 71 and 72, the sparker sp, and the louver motor 572 are controlled in a predetermined sequence to put the gas combustor 1 in a combustion state. When a misfire detection signal is input from the misfire detection circuit 54, the combustion of the gas combustor 1 is stopped.

The notification circuit 58 is provided with a display 59 (four-digit seven-segment LED with ":"), a buzzer 581, and a combustion monitor lamp 582-585 (weak) based on each control information signal input from each control circuit. , Medium, strong, steep).

Next, in the gas hot air heater R, Lo
The operation of the control unit 5 relating to the adjustment / writing of the side / Hi side misfire determination level, the adjustment / writing of the proportional valve current in the seventh speed, the adjustment / writing of the fan Lo and the Hi rotation speed in the first speed / seventh speed, etc. This will be described together with the flowchart of FIG.

At step s1, it is determined whether or not the operation switch 571 is on. If it is determined that the operation switch 571 is on (YES), the process proceeds to step s2. In step s2, the gas warm air heater R shifts to the normal operation mode, and
Proceed to 3. In step s3, the simultaneous press (0.3 seconds or more) of the test switch 551 and the write switch 555 is detected, and when the simultaneous press is detected (YES), step s is performed.
The process proceeds to step S4, and if not detected (NO), the process returns to step s2 to continue the normal operation. In step s4, the mode is shifted to the misfire determination level adjustment and storage mode, the buzzer 581 is sounded once, and the process proceeds to step s5.

At step s5, a temperature setting switch (+) 5
11 is detected, and the pressing is detected (YES).
And proceeds to step s6, and if no pressure is detected (N
O), proceed to step s7. In step s6, the display of the Hi-side determination level (displayed in the right two digits of the display 59) is changed to 1
2mV (X) → 14mV (Y) → 16mV (Z) → 12
mV (X)... (however, mV is not displayed), and the process returns to step s5. In step s7, the press of the temperature setting switch (-) 512 is detected, and if the press is detected (YES), the process proceeds to step s8. If the press is not detected (NO), the process proceeds to step s9. Step s8
, Lo side judgment level (displayed in the left two digits of the display 59)
Is changed from 12 mV (X ₂ ) → 14 mV (Y ₂ ) → 16
mV (Z ₂ ) → 12 mV (X ₂ )... Returning to the switching step s5. In step s9, the save switch 513
Is detected, and if a press is detected (YES), the process proceeds to step s10. If a press is not detected (NO), the process proceeds to step s11. In step s10, the buzzer 581 is sounded twice, and the number 59 is displayed for a predetermined time (1 mS in this embodiment) from the start of pressing the save switch 513.
1 (corresponding to the Lo-side / Hi-side determination level) is made to blink, and the process proceeds to step s12. It should be noted that the time required for erasing the old Hi-side / Lo-side misfire determination level data and writing the new Hi-side / Lo-side misfire determination level data is several hundred milliseconds after the save switch 513 is pressed.
In step s11, the press of the test switch 551 is detected, and if the press is detected (YES), the step s11 is performed.
Returning to step 2, if not detected (NO), the procedure returns to step s5.

In step s12, the mode shifts to the proportional valve current adjustment and storage mode [first speed, seventh speed], and the flow advances to step s13. In step s13, the display of the proportional valve current is started on the display 59, and the process proceeds to step s14. In step s14,
The combustion level is fixed at the first speed, and during the first speed fixed loop (step s14 → NO at step s15 → step s15)
NO in step 16 → At step s14), the first-speed pressure adjustment is performed by turning the gas amount adjusting screw. In step s15, the press of the save switch 513 is detected, and if the press is detected (YES), the process proceeds to step s17. If not (NO), the process proceeds to step s16. In step s16,
The press of the test switch 551 is detected, and when the press is detected (YES), the process returns to step s2. When the press is not detected (NO), the process returns to step s14. In step s17, the combustion level is fixed to the seventh speed, and in step s18
Proceed to. In step s18, the temperature setting switch (+) 51
No. 1 is detected, and if a press is detected (YES), the process proceeds to step s19, and if no press is detected (N
O), proceed to step s20. In step s19, the proportional valve current is increased by 1 mA, and the process returns to step s18. At step s20, the press of the temperature setting switch (-) 512 is detected, and if the press is detected (YES), the process proceeds to step s21. If the press is not detected (NO), the process proceeds to step s2.
Proceed to 2. In step s21, the proportional valve current is reduced by 1 mA, and the process returns to step s18. In step s22, the press of the save switch 513 is detected, and if the press is detected (YES), the process proceeds to step s23, and if not, the process proceeds to step s24. Step s23
Then, the buzzer 581 sounds twice and the save switch 51
For a predetermined time from the start of pressing of No. 3 (1S in this embodiment),
The display value (seventh speed) of the proportional valve current displayed on the display 59 is flashed, and the process proceeds to step s25. The time required to erase the old proportional valve current data and write the new proportional valve current data is several hundred milliseconds after the save switch 513 is pressed. In step s24, the press of the test switch 551 is detected, and the press is detected (Y
ES) and returns to step s2, and no pressing is detected (N
O) In case of, return to step s18.

At step s25, the gas warm air heater R shifts to the fan rotation speed adjustment / storage mode, and at step s26
Proceed to. In step s26, the combustion level is fixed to the first speed, and the flow proceeds to step s27. In step s27, display of the fan current is started, and the flow advances to step s28. In step s28, the press of the temperature setting switch (+) 511 is detected, and if the press is detected (YES), the process proceeds to step s29. If the press is not detected (NO), step s3 is performed.
Go to 0. In step s29, the fan current is increased by 1 mA, and the process returns to step s28. At step s30, the press of the temperature setting switch (-) 512 is detected. If the press is detected (YES), the process proceeds to step s31. If the press is not detected (NO), the process proceeds to step s32. In step s31, the fan current is reduced by 1 mA, and in step s28
Return to In step s32, the press of the save switch 513 is detected, and if the press is detected (YES), the process proceeds to step s33. If not (NO), the process proceeds to step s37. In step s33, the buzzer 581 is sounded twice, and the display value of the Lo fan current displayed on the display 59 is flashed for a predetermined time (1S in this embodiment) from the start of pressing the save switch 513. s3
Proceed to 4. Note that the old Lo fan current data is deleted,
The time required for writing new Lo fan current data is several hundred milliseconds after the save switch 513 is pressed. In step s34, the combustion level is fixed at the seventh speed, and the process proceeds to step s35. At step s35, the press of the temperature setting switch (+) 511 is detected, and if the press is detected (YES), the process proceeds to step s36. If the press is not detected (NO), the process proceeds to step s38. Step s3
In 6, the fan current is increased by 1 mA, and the process returns to step s35. At step s37, the press of the test switch 551 is detected, and if the press is detected (YES), the process proceeds to step s37.
Returning to step 2, if no pressure is detected (NO), the process returns to step s28. In step s38, a temperature setting switch
(−) 512 pressure detection is performed, and the pressure is detected (Y
ES) and the process proceeds to a step s39. If the pressing is not detected (NO), the process proceeds to a step s40. Step s39
Then, the fan current is reduced by 1 mA, and the process returns to step s35.
In step s40, the press of the save switch 513 is detected, and when the press is detected (YES), step s41 is performed.
If not detected (NO), the flow proceeds to step s42. In step s41, the buzzer 581 is sounded twice, and the display value of the Hi fan current displayed on the display 59 is blinked for a predetermined time (1S in this embodiment) from the start of pressing the save switch 513. Return to s5. The time required for erasing old Hi fan current data and writing new Hi fan current data is several hundred milliseconds after the save switch 513 is pressed.
In step s42, the press of the test switch 551 is detected, and if the press is detected (YES), the process returns to step s2. If the press is not detected (NO), step s3 is performed.
Return to 5.

The gas warm air heater R has the following advantages. (A) By pressing the save switch 513 (arbitrary switch), the adjusted value data relating to the Lo / Hi side determination level, the proportional valve current value at the seventh speed, and the fan current value at the first speed / seventh speed are adjusted to E. ² When writing to the PROM 56, as shown in FIG. 3, a numeral 591 indicating an adjustment value during light emission display is displayed on the display 59 for a predetermined time from the start of pressing (1 in this embodiment).
S), a configuration in which a blinking state is set to call attention to the adjustment operator. For this reason, the operator removes the plug from the outlet, cuts off the operating power to the E ² PROM 56, and when the outlet is plugged in again, abnormal data (no data or disordered value) is stored in the storage area in the E ² PROM 56. It is possible to greatly reduce the occurrence of a problem that the written hot air heater R falls into an abnormal operation state. In addition, since the number 591 being displayed on the display 59 is blinking for a predetermined time, a new display is required to notify the writing of the adjustment value data to the E ² PROM 56. do not do.

(I) When the test switch 551 and the write switch 555 are simultaneously pressed (YES in step s3), the mode first shifts to the misfire determination level adjustment and storage mode, and the save switch 513 is pressed (steps s9 and s2).
(YES in ^2, 32 and 40), the corresponding type of adjustment value is written into the E ² RPM 56, and the proportional valve current adjustment and storage mode (first speed adjustment, seventh speed adjustment) → fan speed adjustment The mode shifts to the storage mode [Lo side, Hi side] ... Further, it is possible to return to it without the normal operation mode for writing the adjustment value and pressing the test switch 551 during each adjustment and storage mode in E ² PRPM56 (step s2). Therefore, the adjustment and writing operation can be easily performed, and writing of an incorrect adjustment value can be prevented.

(C) At the time of each adjustment and writing, the gas warm air heater R adjusts the Lo / Hi side misfire determination level for each of the first to second speed, third speed to eighth speed combustion level groups, The adjustment value data relating to the proportional valve current at the first speed and the adjustment value data relating to the fan current at the first speed and the seventh speed are stored in the E ² PROM 56, and the readout circuit 562 reads out these adjustment value data and reads out the misfire detection circuit 54 and the proportional valve drive. The circuit 52 and the fan control circuit 53 determine the Lo / Hi side misfire determination level, the proportional valve current at the seventh speed,
It is the fan current at 7th speed. E ² PROM 56
According to the structure, even if a mechanical shock such as vibration is applied to the control unit 5, each adjustment value data does not fluctuate in terms of structure. Therefore, the misfire determination by the misfire detection circuit 54, the control of the proportional valve current by the proportional valve drive circuit 52, and the fan control circuit 5
3 is excellent in the control of the convection fan 4.

(E) Since the test switch 551 is provided on the board of the control unit 5 which is not touched by the user, the mode does not shift to the adjustment / write mode, and the user erroneously misfires. The judgment level, the proportional valve current, and the fan current do not change.

The present invention includes the following embodiments in addition to the above embodiment. a. A configuration may be adopted in which a reset switch is provided, and when the switch is pressed, the standard adjustment value is written in the E ² PROM 56. b. An E ² PROM 56 such as an MNOS type or a MAOS type may be used. c. In the above embodiment, the adjustment value data of the integer value is stored in the E ² PROM 56, but a decimal value may be stored. d. Temperature adjustment switch (+) during proportional valve current adjustment and writing, fan Lo and Hi rotation speed adjustment and writing
(-) If an auto increment or auto decrement function is added to 511 or 512, the adjustment time can be reduced.
For example, if the pressing state continues for more than 0.2 seconds,
At 0.1 second intervals, increase or decrease the fan current or the proportional valve current by ± 1 mA.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a gas hot air heater according to one embodiment of the present invention.

FIG. 2 is a block diagram of the gas warm air heater.

FIG. 3 is an enlarged view of a main part showing a periphery of an indicator of the gas hot air heater.

FIG. 4 is a flowchart illustrating the operation of the gas warm air heater.

FIG. 5 is a flowchart illustrating the operation of the gas warm air heater.

FIG. 6 is a flowchart illustrating the operation of the gas warm air heater.

[Explanation of symbols]

3 Proportional valve (combustion actuator) R Gas hot air heater (combustion device) 42 Motor (combustion actuator) 52 Proportional valve drive circuit (control circuit) 53 Fan control circuit (control circuit) 54 Misfire detection circuit (safety circuit) 55 Adjustment mode control circuit (adjustment means) 56 E ² PROM (semiconductor nonvolatile memory) 58 Notification circuit (notification means) 59 Display 511 Temperature setting switch (+) (Adjustment means) 512 Temperature setting switch (-) (Adjustment means) 561 Write circuit 562 Read circuit

Continuation of the front page (56) References JP-A-1-137116 (JP, A) JP-B-60-5250 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23N 5 / 26 F23N 5/24 113

Claims (1)

(57) [Claims] An adjusting means for adjusting an adjustment value of a safety circuit or a control circuit for controlling a combustion actuator, and an adjustment value adjusted by the adjusting means is displayed on a display.
A non-volatile semiconductor memory in which adjustment value data is electrically rewritable; a writing circuit that converts the adjustment value adjusted by the adjustment means into adjustment value data and stores the adjustment value data in the semiconductor non-volatile memory; A reading circuit that reads adjustment value data stored in a non-volatile memory, converts the adjustment value data into adjustment values of the safety circuit and the control circuit, and outputs the adjustment value data to the writing circuit. Before
When writing to the semiconductor non-volatile memory, it is displayed on the display.
Flashes the indicated adjustment value to the semiconductor nonvolatile memory.
A combustion device for notifying that writing is in progress .