KR970001940B1 - Combustion system - Google Patents

Abstract

In a status that a combustion system is disclosed, when the EEPROM is initialized in step S1, the system moves to step S2. The writing circuit writes the standard adjustment value data about the Lo/Hi side extinction determination level and the proportional valve current of a group(7) extinction level and the fan current of the groups(1,7) to the EEPROM. Thus, an abnormal operation state before adjustment process of the combustion system in which the adjustment value data of a control circuit is written in a semiconductor non-volatile memory can be eliminated.

Description

Combustion device

1 is a structural diagram of a gas warm air heater according to an embodiment of the present invention,

2 is a block diagram of the gas hot air heater,

3 is a flowchart illustrating the operation of the gas hot air heater,

4 is a flowchart for explaining the operation of the gas hot air heater,

5 is a flowchart for explaining the operation of the gas hot air heater,

6 is a flowchart for explaining the operation of the gas hot air heater,

7 is a flowchart for explaining the operation of the gas warm air heater.

* Explanation of symbols for main parts of the drawings

R: Gas hot air heater (combustion device) 3: Proportional valve (combustion actuator)

4: Convection fan (combustion actuator) 52: Proportional valve drive circuit (control circuit)

53: fan control circuit (control circuit) 54: misfire detection circuit (stable circuit)

56: E ² ROM (Semiconductor Nonvolatile Memory)

511: temperature setting switch (+) (adjustment means)

512: temperature setting switch (-) (adjustment means) 561: write circuit

562: readout circuit.

The present invention relates to a combustion apparatus of a type for storing adjustment value data of a control circuit in a semiconductor nonvolatile memory.

Background Art Conventionally, DIP switches and semi-fixed VRs have been used to adjust misfire determination levels, fan rotation speeds, and proportional valve currents in hot air heaters. However, since the DIP switch usually has only 4 ~ 7 circuits of capacity, the adjustment value cannot be adjusted accurately, and if used several times for accurate adjustment, a lot of space is required and at the same time, the parts cost is high. In addition, the perturbation piece is moved by the vibration of the semiconductor VR and the adjustment value is changed.

Thus, the present inventors have made a hot air heater of a type in which each adjustment value of fan current, proportional valve current, and misfire determination level is stored in a semiconductor nonvolatile memory (E ² PROM).

However, the warm air heater becomes data-free (or disorderly data is stored) in the adjustment value storage area of the E ² PROM until the operator adjusts the adjustment value of the safety circuit or the control circuit and stores each adjustment value in the E ² PROM. When the operation is started, the fault that the abnormal operation state is lost is checked and the safety circuit is monitored using this adjustment value.

The adjustment operator adjusts the adjustment value of the safety circuit or the control circuit during adjustment, and the writing circuit converts this adjustment value into adjustment value data and stores it in the semiconductor nonvolatile memory. The set value data is changed to the adjusted value data of the adjusted value after adjustment.

The readout circuit reads and converts the adjustment data after adjustment stored in the semiconductor nonvolatile memory to the adjustment value of the safety circuit or the control circuit, and the control circuit controls the combustion actuator based on this adjustment value. Uses these adjustments to monitor safety.

Since the predetermined adjustment value data is written into the semiconductor nonvolatile memory as the initialization of the semiconductor nonvolatile memory, it is possible to stabilize the operation state of the combustion device before the adjustment operation and to perform safety monitoring without any trouble.

In addition, if the adjustment value data written into the semiconductor nonvolatile memory at the time of initialization of the semiconductor nonvolatile memory is set as the standard value, the operation of the combustion device before the adjustment operation is further stabilized, and the adjustment amount of the adjustment value by the adjustment means at the time of adjustment is adjusted. Can alleviate

An embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the gas-heated air heater R is composed of a gas combustor 1 combusting at a continuous level of 1 to 8 speeds, a thermocouple 2 and a gas combustor 1 detecting abnormal combustion. Proportional valve (3) for adjusting the amount of gas supplied, convection fan (4) for supplying combustion air to the gas burner (1) and control unit (5) for controlling the proportional valve (3) or convection fan (4), etc. It is provided. In addition, 6 is a heater housing, 61 is an air induction path which guides indoor air k to the gas combustor 1, 611 is a dummyster which detects room temperature, and 7 is a gas pipe.

The gas burner (1) comprises a combustion plate (11) made of ceramics and a nozzle (7) disposed downstream of the combustion body (12) and air inflow path (61) in which the spaker (sp) or thermocouple (2) is disposed. It consists of the mixing chamber 13 which mixes the gas g blown out from the indoor air k guide | induced by the air flow path 61. As shown in FIG.

The thermocouple 2 is disposed in close proximity to the upper surface of the combustion plate 11 and is exposed to a burning flame to transmit an electric output according to the combustion state of the gas burner 1.

The proportional valve 3 is a valve for adjusting the gas amount of the gas g ejected from the nozzle 7, and the amount of passing gas increases in proportion to the energization amount.

The convection fan 4 consists of the impeller 41 pivotally mounted in the duct 67 downstream of the gas burner 1, and the motor 42 which drives the impeller 41. As shown in FIG.

The gas pipe 7 sequentially arranges the solenoid valves 71, 72 and the proportional valve 3 from the upstream side and is connected to the nozzle 7.

In addition, the proportional valve 3 has a gas governor for making the secondary gas pressure constant, and a gas amount adjusting screw for adjusting the gas supply amount at the combustion level 1 speed.

The heater housing 6 is provided with the intake ports 64 and 65 of the indoor air k used for mixing and combustion in the upper surface, and the blowout port 66 is provided in the lower part of a front surface. The suction holes 64 and 65 are freely detachable from the filter 60 for removing dust in the room, and the louver 611 for changing the blowout direction of the warm air w is provided in the blowout port 66. Attached. 67 is a duct which communicates the suction port 65 and the blowout port 66.

As shown in FIG. 2, the control unit 5 having a microcomputer (not shown) includes a combustion amount determining circuit 51, a proportional valve driving circuit 52, a fan control circuit 53, and a misfire detection circuit 54. And an adjustment mode control circuit 55, an E ² PROM 56, a write circuit 561, a read circuit 562, an operation control circuit 57, and a notification circuit 58.

In the normal operation mode, the combustion amount determining circuit 51 stores the difference between the set temperature set by the temperature setting switches 511 and 512 (+) (-) and the room temperature detected by the dummyster 611 and the save switch. The combustion level (1 to 8 speed) is determined based on the pressing state of the 513 or the metal switch 514.

In addition, when changing to the proportional valve current adjustment mode, the combustion level is first fixed at 1 speed for the adjustment of the gas amount adjusting screw, and the combustion level after pressing any predetermined switch (for example, the save switch 513). Is fixed at 7 speed.

In addition, when shifting to the fan speed adjustment mode, the combustion level is first fixed at 1 speed, and after pressing the save switch 513, the combustion level is fixed at 7 speed.

The proportional valve driving circuit 52 determines the amount of shunt current at 1 to 6 speeds based on the proportional valve current value at 7 speeds read out from the E ² PROM 56 by the reading circuit 562. 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 sent to the motor 42.

The misfire detection circuit 54, which is a safety circuit, has a Lo side described later in which the intensity of the electric output transmitted by the thermocouple 2 corresponds to each combustion level group. If the Hi side misfire determination level is not reached, it is determined that the gas burner 1 is in an abnormal combustion state (oxygen-depleted combustion, misfire), and a misfire detection signal is sent to the operation control circuit 57.

The adjustment mode control circuit 55 is a simultaneous pressure (0.3) of the test switch 550 and the write switch 555 disposed on the substrate of the control unit 5 (both are always open push switches which are closed only when pressed). The gas-heated air conditioner R is shifted to the control and write mode (first to the misfire determination level adjustment and the storage mode) by a second or more), and the misfire determination is performed by pressing a predetermined switch, for example, the save switch 513 alone. From the level adjustment and storage mode, the proportional valve current adjustment and storage mode [1 speed adjustment pressure, 7 speed adjustment pressure] → fan speed adjustment and storage mode [Lo side, Hi side] → misfire determination level adjustment and storage mode → proportional valve current adjustment Storage mode. Go to

In addition, when the initialization of the E ² PROM 56 is set by the method described below, the adjustment mode control circuit 55 is set at the standard misfire determination level (12 mV, 12 mV) on the Lo side and Hi side and the combustion level at the seventh speed. Each standard constant output corresponding to the standard rated proportional valve current amount (200mA) and the standard fan current amount (100mA, 900mA) at 1 speed and 7 speeds is sent to the write circuit 561, and the write circuit 561 sends E ² Each standard adjustment value data is written to the PROM 56.

The temperature setting switches 511, 512 (+) (-) (exposed to the operation panel) and the adjustment mode control circuit 55 in the determination level adjustment mode constitute a true determination level adjustment means. Adjust the Lo-side and Hi-side misfire determination level for each combustion level group of 2nd speed, 3rd speed and 8th speed.

In addition, the temperature setting switches 511, 512 (+) (-) and the adjustment mode control circuit 55 in the proportional valve current adjustment and storage mode constitute a pressure adjustment means so as to achieve a combustion speed at the seventh speed. Adjust the valve current in proportion to the rating (in units of 1 mA).

Then, the temperature setting switches 511, 512 (+) (-) and the adjustment mode control circuit 55 in the fan rotation speed adjustment mode constitute the fan rotation speed adjusting means in the first and seventh speeds. Adjust fan current (1mA).

Number E ² PROM (56) is rewritable number of times sikineunde stores the adjustment value data by forming a floating gate in the insulating material of SiO ₂ accumulate electric charges in the gate by using the tunnel effect with a capacity of k bits is at least 10 ⁵ times The maintenance period is more than 10 years. The adjustment data stored in the E ² PROM 56 are related to the Lo side. Hi side misfire determination level, the proportional valve current at 7 speed, and the fan current at 1 speed.

The write circuit 561 operates (even during initialization) by the pressing operation of the save switch 513 after the determination of each adjustment value in each adjustment mode, and the temperature setting switches 511, 512 (+) ( The Lo side and Hi side misfire determination level and the adjustment value of the proportional valve current at 7 speed or the fan current of the convection fan 4 at 1 speed and 7 speed are adjusted to each adjustment value data. To be stored in the E ² PROM 56.

In addition, the initialization of the E ² PROM 56 can be performed by replacing two predetermined port connection states of the microcomputer (not shown). After the control unit 5 is manufactured, the operator can operate the E ² PROM as described above. When the initialization of (56) is set, the standard adjustment value data corresponding to the standard misfire determination level on the Lo side and the Hi side and the combustion level at the 7th speed, and the standard fan current amount at the 1st speed and the 7th speed are automatically generated. Is written into the E ² PROM 56.

The readout circuit 562 reads out each adjustment value data written in the E ² PROM 56 from time to time, and determines the Lo-side.Hi-side misfire determination level at each of the combustion amounts of 1st to 2nd speed and 3rd to 8th speed. Each of these adjustment value signals is converted into an adjustment mode control circuit 55, a misfire detection circuit 54, and a proportional valve drive circuit 52 by converting them into adjustment values of the proportional valve current in the gearbox and fan adjustment current values in the 1st and 7th speeds. ) And fan control circuit 53.

The operation control circuit 57 controls the solenoid valves 71, 72, the spakers, and the louver motors 572 when the operation switch 57 is turned on and is shifted to the normal operation mode. Let 1) be in combustion state. In addition, when the misfire detection signal is input from the misfire detection circuit 54, the gas burner 1 is stopped.

The notification circuit 58 has an indicator 581 (four-digit seven-segment LED) buzzer 582 and a combustion monitor lamp 583 (weak, medium, strong, grade) based on each control information signal input from each control circuit. To control.

Next, the operation of the control unit 5 relating to the initialization of the E ² PROM 56 in the gas air conditioner R will be described with the flowchart of FIG. When the connection state of the two predetermined ports of the microcomputer is replaced in step s1, and the initialization setting of the E ² PROM 56 is instructed (YES), the flow proceeds to step s2.

In step s2, the write circuit 561 receives the standard adjustment value output and responds to the standard misfire determination level on the Lo side, Hi side, the standard proportional valve current at the 7th combustion level, and the standard fan current at the 1st and 7th speeds. the standard adjustment value data to be written to the E ² PROM (56). When the connection state of the two ports returns to the original state and the initialization setting release of the E ² PROM 56 is instructed, writing to the standard adjustment value data E ² PROM 56 is stopped.

The time required for writing the standard adjustment value data to the E ² PROM 56 is several 100 ms, and the accuracy of the writing can be improved by repeating the writing operation until the initialization setting release is instructed.

Next, operation | movement of the control unit 5 regarding control at the time of adjustment in gas-heated air conditioner R is demonstrated with the flowchart of FIGS. 4-7.

In step s3, it is determined whether or not the operation switch 571 is in an ON state, and if it is determined to be in an on state (YES), the flow proceeds to step s4.

In step s4, the gas warm air heater R shifts to the normal operation mode and then proceeds to step s5.

In step s5, when the test switch 550 and the write switch 555 detect the co-pressurization (0.3 seconds or more) and detect the co-pressurization (YES), the flow advances to step s6, and when not detected (NO), the flow goes to step s4. Go back.

In step s6, the process shifts to the adjustment and write mode, and the buzzer 582 is driven once to proceed to step s7.

In step s7, if the pressure setting of the temperature setting switch 511 (+) is carried out and pressure is detected (YES), the process proceeds to step s8. If pressure is not detected (NO), the process proceeds to step s9.

In step s8, the Lo side determination level display is changed from 12 mV (X) to 14 mV (Y) to 16 mV (Z) to 12 mV (X). The operation returns to step s7.

In step s9, if pressure detection of the temperature setting switch 512 (-) is performed (YES) is detected (YES), the flow proceeds to step s10, and if pressure is not detected (NO), the flow proceeds to step s11.

In step s10, the Lo side determination level display is changed from 12 mV (X ₂ ) to 14 mV (Y ₂ ) to 16 mV (Z ₂ ) to 12 mV (X ₂ ). The operation returns to step s7.

In step s11, if pressure detection of the save switch 513 is performed and pressure is detected (YES), the flow proceeds to step s12. If pressure is not detected (NO), the flow proceeds to step s13.

In step S12, the misfire determination level value on the Lo side displayed on the display 581. Hi side is written to the E ² PROM 56, and the buzzer 582 is driven twice to proceed to step s14.

When the pressure is detected by the test switch 550 in step s13 (YES), the flow returns to step s4, and when not detected (NO), the flow returns to step s7.

In step s14, the flow shifts to the proportional valve current adjustment and confirmation mode [1 speed. 7 speed], and then the flow advances to step s15.

In step s15, the display of the proportional valve current is started on the display 581, and the flow proceeds to step s16.

At step s16, the combustion level is fixed at 1 speed, and the gas volume adjustment screw is turned to perform 1 speed regulation during the loop of the fixed speed (NO at step s23 from NO to step s23 at step s16 to step s17).

In step s17, if pressure detection of the save switch 513 is performed and pressure is detected (YES), the flow proceeds to step s18, and if not detected (NO), the flow proceeds to step s23.

In step s18, the combustion level is fixed at 7 speeds, and then the flow proceeds to step s19.

In step s19, if pressure detection of the temperature setting switch 511 (+) is performed and pressure is detected (YES), the flow proceeds to step s20, and if pressure is not detected (NO), the flow proceeds to step s21.

In step s20, the proportional valve current is increased by 1 mA and the process returns to step s19.

In step s21, if pressure detection of the temperature setting switch 512 (+) is performed and pressure is detected (YES), the flow proceeds to step s22, and if pressure is not detected, the process proceeds from (NO) to step s24.

In step s22, the proportional valve current is increased by 1 mA and the process returns to step s19.

When the pressure is detected by the test switch 550 at step s23 (YES), the flow returns to step s4, and when not detected (NO), the flow returns to step s16.

In step s24, if pressure detection of the save switch 17 is performed and pressure is detected (YES), the flow proceeds to step s25A, and if not detected, NO proceeds to step s25B.

In step s25A, the buzzer 582 is driven twice, and the proportional valve current value displayed on the indicator 581 is stored in the E ² PROM 56, and the flow proceeds to step s26.

If the pressure is detected by the test switch 550 at step s25B (YES), the process returns to step s4, and if no pressure is detected (NO), the process returns to step s19.

In step s26, the gas hot air heater 12 is shifted to the fan speed adjustment mode, and then the flow advances to step s27.

In step s27, the combustion level is fixed at 1 speed, and the flow proceeds to step s28.

The display of the fan current is started in step s28, and the flow proceeds to step s29.

If the pressure setting of the temperature setting switch 511 (+) is detected in step s29 and pressure is detected (YES), the process proceeds to step s30. If no pressure is detected, the process proceeds to step s31.

The fan current is increased by 1 mA in step s30, and the process returns to step s29.

If the pressure setting of the temperature setting switch 512 (-) is detected in step s31 and pressure is detected (YES), the flow proceeds to step s32. If no pressure is detected, the flow proceeds to step s33.

In step s32, the fan current is lowered by 1 mA to return to step s29.

In step s33, if pressure detection of the save switch 513 is performed and pressure is detected (YES), the flow proceeds to step s35, and if not detected, NO proceeds to step s34.

In step s34, if the pressure detection of the test switch 550 is performed and pressure is detected (YES), the process returns to step s4, and if no pressure is detected (NO), the process returns to step s29.

In step s35, the buzzer 582 is driven twice, and the Lo fan current value displayed on the display 581 is stored in the E ² PROM 56, and the flow proceeds to step s36.

In step s36, the combustion level is fixed at seven speeds, and the flow advances to the next step s37.

In step s37, if the pressure setting of the temperature setting switch 511 (+) is detected and pressure is detected (YES), the process proceeds to step s38. If no pressure is detected, the process proceeds to step s39.

In step s38, the fan current is increased by 1 mA and the process returns to step s37.

In step s39, if pressure detection of the temperature setting switch 512 (-) is performed and pressure is detected (YES), the flow proceeds to step s40. If pressure is not detected, the flow proceeds to step s41 (NO).

In step s40, the fan current is lowered by 1 mA to return to step s37.

In step s41, if pressure detection of the save switch 513 is performed and pressure is detected (YES), the flow proceeds to step s43, and if not detected, NO proceeds to step s42.

When the pressure is detected by the test switch 550 at step s42 (YES), the flow returns to step s4, and when no pressure is detected (NO), the flow returns to step s37.

In step s43, the buzzer 582 is driven twice, and the Hi fan current value displayed on the display 581 is stored in the E ² PROM 56, and the flow proceeds to step s7.

The gas hot air heater R has the following advantages.

(A) When the connection state of the two ports of the microcomputer is changed after the assembly of the control unit 5 is completed, and the initialization of the E ² PROM 56 is instructed, the E ² PROM 56 is connected to the Lo side and the Hi side. Standard misfire determination level (12mV, 12mV), standard proportional valve current value (200mA) at 7-speed combustion level, 1 speed. Each standard adjustment value data corresponding to the standard fan current values (100 mA and 900 mA) at the seventh speed is automatically written. When the gas warm air heater R is assembled and the heating operation is started, the readout circuit 562 reads out each adjustment value data written to the E ² PROM 56 to read the misfire detection circuit 54 and the proportional valve drive circuit. The furnace 52 and the fan control circuit 53 operate based on the standard misfire determination level (12 mV, 12 mV), the standard proportional valve current value (200 mA), and the standard fan current value (100 mA, 900 mA).

Therefore, the misfire detection circuit 54, the proportional valve driving circuit 52, and the fan control circuit 53 operate based on the adjustment value close to the normal value. It will work stably.

(B) By simultaneously pressing the test switch 550 and the write switch 555 (YES in step s5), the system first enters the misfire determination level adjustment and storage mode, and the save switch 5B is pressed ((steps S11, S17, S24). , S33, S41, writes an adjustment value of the corresponding type to the E ² PROM 56 by YES) and simultaneously presses the test switch 550 during the proportional valve current adjustment and storage mode, and the adjustment value is changed to the E ² PROM 56. Can be returned to the normal operation mode (step s4).

Therefore, it is easy to perform adjustment and write operation, and writing of wrong adjustment value can be prevented.

(C) The gas-heated air conditioner (R) is the adjustment value data regarding the Lo-side and Hi-side misfire determination level for each combustion level group of 1st speed-2nd speed, 3rd speed-8th speed at the time of adjustment and writing. The adjustment value data regarding the proportional valve current and the adjustment value data regarding the fan current at 1 speed and 7 speed are stored in the E ² PROM 56, and the reading circuit 562 reads these adjustment data to read the misfire detection circuit ( 54) The Lo side, Hi side misfire determination level of the proportional valve drive circuit 52 and the fan control circuit 53, the proportional valve current in 7 speeds, and the fan current in 1 speed and 7 speeds are set.

In the E ² PROM 56, even if a mechanical shock such as a vibration is applied to the control unit 5, each adjustment value data does not change in structure. Therefore, the reliability of misfire determination by misfire detection circuit 54, control of proportional valve current by proportional valve drive circuit 52, and control of convection fan 4 by fan control circuit 53 is excellent.

(D) Since the test switch 550 is disposed on the substrate of the control unit 5 without the user touching, the test switch 550 does not enter the adjustment and write mode, and the user accidentally enters the Lo side. The proportional valve current and the fan current at 1 speed and 7 speed are not changed.

(E) In each adjustment mode, the save switch 513, temperature setting switch 511, and (512) (+) (-) disposed on the operation panel located on the upper surface of the heater housing 6 are useful. Lo-side, Hi-side misfire determination level, proportional valve current at 7 speeds, and fan adjustment current at 1 speed, 7 speeds are adjusted and stored, so the number of switches that need to be placed on the substrate of the control unit 5 Can be reduced (may be one), and spare parts cost can be saved.

(E) Since the initial setting of the E ² PROM 56 is performed using two ports of the microcomputer, not the duct switch, the adjustment value data is not accidentally deleted after the adjustment operation.

The present invention includes the following embodiments in addition to the above embodiments.

a. A reset switch may be provided, and the switch may be pressed to write a standard adjustment value in the E ² PROM 56.

b. E ² PROM 56 such as MNOS type or MAOS type may be used.

c. In the above embodiment, the adjustment value data of the adjustment value of the E ² PROM 56 is stored, but a decimal value may be stored.

d. Auto-crement to temperature setting switch (511), (512) (+) (-) at the time of proportional valve current adjustment and writing at speed 7, fan Lo, Hi rotation speed adjustment and writing at speed 1 and 7. The addition of the auto decrement function can shorten the adjustment time. For example, if the pressure continues for more than 0.2 seconds, increase or decrease the pin current or proportional valve current by ± 1mA in 0.1 second intervals.

Claims (1)

Adjusting means for adjusting an adjustment value of a control circuit for controlling a safety circuit or a combustion actuator, a semiconductor nonvolatile memory capable of electrically rewriting the adjustment value data, and converting the adjustment value adjusted by the adjustment means into adjustment value data. A combustion apparatus comprising a write circuit for storing in the semiconductor nonvolatile memory and a readout circuit for reading and converting adjustment value data stored in the semiconductor nonvolatile memory to be an adjustment value of the safety circuit or the control circuit. And an initialization setting means for automatically writing predetermined adjustment value data into said semiconductor nonvolatile memory.