KR100208118B1 - Combustion appliance - Google Patents

Abstract

The present invention relates to a combustion apparatus that can cope with a simple operation when the type of gas to be used is changed, the configuration of which is a water flow switch (4) 'on' when the water flow is detected, and a gas supply path It consists of an electronic safety valve 1 provided in the middle, a holding timer circuit 7 for flowing a holding current for a predetermined time (for example 5.5 seconds), and an ignition detecting circuit 8 for detecting the ignition of the gas burner. When the gas to be used as the gas instantaneous water heater A is changed from, for example, city gas to natural gas, the serviceman connects the resistor 73 in parallel to the resistor 72 of the maintenance timer circuit 7 so as to provide a ' The transmission time of the ON 'signal 71 is shortened (for example, 5.5 seconds). 3 seconds).

Description

Combustion device

1 is an external view of a gas instantaneous water heater according to an embodiment of the present invention.

2 is a configuration diagram of the gas instantaneous water heater.

3 is a block diagram of the gas instantaneous water heater.

4 is a flowchart showing the operation of the gas instantaneous water heater.

5 is a flowchart showing the operation of the gas instantaneous water heater.

6 is a timer chart showing the operation of the gas instantaneous water heater.

7 is an electric circuit diagram of a holding timer used for the gas instantaneous water heater.

8 is an explanatory diagram showing the shape of the upper surface of the substrate.

* Explanation of symbols for main parts of the drawings

A: Gas instantaneous water heater (combustion device) 1: Electronic safety valve (solenoid valve)

2: gas burner 3: heat exchanger

4: Water flow switch 5: Ignition circuit

7: holding timer circuit 8: ignition detection circuit (safety circuit)

14: transistor (switch element) 21: gas pipe (gas supply path)

31: heat exchanger (heat exchanger) 41: contact

71: comparator (comparator) 72: resistance (resistance for time setting)

73: resistance (resistance for shortening time) 75: resistance (resistance for partial pressure)

76: resistance (divisional resistance) 77: electrolytic capacitor

92 battery (battery)

The present invention relates to a combustion apparatus.

As a combustion apparatus, for example, a solenoid valve is provided in the middle of a gas supply path to a gas burner in a gas water heater. As the ignition means of the gas burner, for example, an ignition device in which high voltage is generated by energizing and spark discharged is known. The solenoid valve and the ignition device are each connected to a DC power supply (for example, a battery) through a switch element such as a transistor, and when the ON signal is input to the transistor, the solenoid valve and the ignition device are energized. .

Specifically, when the water flow switch for detecting the water flow is 'on', the 'on' signal is sent to each transistor for controlling the energization of the solenoid valve and the ignition device for a predetermined time (for example, 5 seconds). When the gas burner is ignited, the 'on' signal is sent from the safety device, and the energization to the solenoid valve is continued even after a predetermined time elapses.

However, even when the water flow switch is 'on' and the ignition operation to the gas burner is performed, the time until the ignition is fired (until the safety device sends the 'on' signal) varies depending on the type of gas. In the case of gas (propane gas, natural gas) having a large calorific value, the safety device sends an 'on' signal relatively quickly, but in the case of a gas (city gas) having a small calorific value, the 'on' signal is delayed.

For this reason, the predetermined time of the holding timer circuit is set (fixed) according to the type of gas to be used.

For this reason, when the type of gas used by the director, the gas conversion work, etc. is changed, it is necessary to replace the control board in addition to the replacement of the gas burner and the like, and there is a problem in that it takes time and money.

An object of the present invention is to provide a combustion apparatus that can cope with a simple operation when the kind of gas to be used is changed.

In order to solve the said subject, this invention employ | adopted the following structures.

(1) A solenoid valve installed in the middle of a gas supply path for supplying gas to a gas burner, the valve body being opened by energization; a holding circuit for energizing the solenoid valve for a predetermined time from the ignition instruction; and an ignition operation by the ignition instruction. A combustion apparatus comprising an ignition circuit for starting a detection flame and a safety circuit for energizing the solenoid valve while the combustion flame is detected by the ignition instruction, wherein the predetermined time of the holding circuit is arbitrarily selected. It was settable.

(2) a heat exchange water passage having a solenoid valve installed in the middle of a gas supply passage for supplying gas to the gas burner, the valve body being opened by energization, a heat exchange section heated by the gas burner, and one end connected to the battery; A water flow switch whose contact is 'on' when the water flow flowing in the heat exchange water is detected, a switch element electrically connected between the solenoid valve and the other end of the water flow switch, and an ignition operation when the water flow switch is 'on' A starting timer circuit, a holding timer circuit electrically connected to the other end side of the water flow switch and outputting an 'on' signal to the switch element for the predetermined time when an electric power for operation is supplied; When the operating power is supplied, the detection of the combustion flame is initiated and the 'ON' signal is sent to the switch element while the combustion flame is detected. In a combustion apparatus provided with a circuit, the maintenance timer circuit for the predetermined period of time was to be arbitrarily set (range of claim 1, wherein the appended claims).

(3) With the configuration of (2) above, the holding timer circuit electrically connects one input terminal of the comparator to the other end of the water flow switch through a voltage dividing resistor, and grounds the other input terminal through a time setting resistor. It is also configured to be electrically connected to the other end side of the water flow switch via an electrolytic capacitor, and the increase or decrease of the predetermined time is performed by changing the resistance value of the time setting resistor (claim 2).

(4) It has the structure of said (3), and shortening the said predetermined time is performed by connecting the resistance for time reduction to both ends of the said time setting resistance (claim 3).

In the case of the first configuration, when the burner ignition instruction is issued, the holding circuit energizes the solenoid valve to open the valve body. At the same time, the ignition circuit starts the ignition operation.

The holding circuit energizes the solenoid valve for a predetermined time so that the solenoid valve remains open for at least the predetermined time.

When the gas burner is ignited and the safety circuit detects the combustion flame during the predetermined time, the safety circuit continues to energize the solenoid valve even after the predetermined time has elapsed, so that the solenoid valve is kept open and the gas burner continues combustion.

In the case of changing the heat generation amount of gas (city gas) which takes some time for ignition (until the safety circuit detects the combustion flame), the serviceman sets a predetermined time of the holding circuit long to prevent ignition miss. In addition, in the case of changing the gas (propane gas and natural gas) with a large amount of heat generated by ignition relatively quickly, the serviceman sets a predetermined time shortly to reduce the amount of gas leakage occurring during ignition.

In the case of the second configuration, when water flows into the heat exchange channel, the contacts of the water flow switch are 'on'.

This energizes the solenoid valve and opens the valve body. At the same time, the ignition circuit starts the ignition operation. In addition, since the holding timer circuit sends an 'ON' signal so that the switch element is 'ON', the solenoid valve is kept open for at least a predetermined time.

When the gas burner is ignited and the safety circuit detects a combustion flame during a predetermined time, the safety circuit starts to send an 'on' signal to the switch element. Therefore, the solenoid valve remains open after a predetermined time and the gas burner burns. Continue.

In the case of changing to a gas (city gas) having a small amount of heat generated for ignition, the serviceman sets a long time for the maintenance timer circuit to prevent ignition miss. In addition, in the case of changing the gas (propane gas and natural gas) having a large amount of heat generated to ignite relatively quickly, the serviceman sets a predetermined time shortly to reduce the amount of gas leakage occurring at the time of non-ignition.

In the second configuration, for the first case as the specific configuration, when water flows into the heat exchange channel and the contact point of the water flow switch is 'on', the electrolytic capacitor is charged at a rate corresponding to the resistance value of the time setting resistor, The potential at the other input rises. Then, the comparator sends an 'ON' signal until the potential of the other input terminal becomes higher than the potential of the one input terminal (at the end of the predetermined time), so that the switch element is 'ON'.

When the gas burner is ignited and the safety circuit detects a combustion flame during a predetermined time, the safety circuit sends an 'on' signal to the switch element, and the open state of the solenoid valve is maintained even after the predetermined time has elapsed, and the gas burner continues combustion. .

In the case of changing to a gas (city gas) with a small amount of heat generated for ignition (until the safety circuit detects a combustion flame), the serviceman increases the resistance value of the time setting resistor to increase the second timer time. do. In addition, in the case of changing the gas (propane gas and natural gas) with a large amount of heat generated to ignite relatively quickly, the serviceman lowers the resistance value of the resistance for setting the time to shorten the predetermined time in order to prevent the gas discharge during ignition miss. do.

In the second configuration, in the second case as the specific configuration, when the resistance for time reduction is connected to both ends of the time setting resistor, the predetermined resistance is shortened because the synthesized resistance value is lowered.

In the first configuration, in order to keep the solenoid valve open, a forced holding time for forcibly energizing the solenoid valve was set so that the control board could be replaced even if the type of gas used by the mover or the gas switching construction was changed. There is no need to do this, and the serviceman can easily set the forced holding time according to the type of gas.

For the second configuration (claim 1), in order to keep the solenoid valve open, the forced holding time of the holding timer circuit for forcibly sending an 'on' signal to the switch element that controls the energization of the solenoid valve. Since it can be set arbitrarily, even if the kind of gas used by a director, gas switching work, etc. changes, it is not necessary to replace a control board, and a serviceman can easily set the forced holding time according to the kind of gas.

In the second configuration, with respect to the first specific configuration, the controller board does not need to be replaced even if the type of gas used by the director and the gas conversion work is changed, and the serviceman only increases or decreases the resistance value of the time setting resistor. This can be changed to the forced holding time according to the type of gas.

In the second configuration, in the case of the second specific configuration, when the heating value is changed to a gas with a large amount of heat generated by the director and the gas telephone corporation, etc., there is no need to replace the control board, and the service man is required to shorten the time at both ends of the time setting resistor. The forced holding time can be changed shortly by simply connecting a resistor.

An embodiment of the present invention will be described with reference to FIGS. As shown in the figure, the gas instantaneous water heater (A) has a suction coil (11) and a holding coil (12) and an electronic safety valve (1) installed in the middle of the gas pipe (21) for supplying gas to the gas burner (2). And the heat exchange channel 3 having the transistors 13 and 14, the heat exchanger 31, the water flow switch 4 in which the contact 41 is 'on' when the water flow is detected, and the contact 41 An ignition circuit 5 for starting the ignition operation by energization starting with energization, a suction timer circuit 5 for transmitting an 'on' signal 61 for 0.4 seconds from the power supply start, and for 5.5 seconds from the power supply start / The holding timer circuit 7 for transmitting the 'on' signal 70 for 3 seconds (second timer time), and when the voltage V _cc2 starts to feed, the detection of the combustion flame starts and the transistor while the combustion flame is detected. 14, an ignition detection circuit 8 for transmitting the ON signal 81 is provided.

91 is a regulator. When the contact 41 of the water flow switch 4 is 'on', voltage _Vcc2 is applied to the IN terminal 910, and a stabilization voltage V _REG (1.5V) is generated to the OUT terminal 911. .

92 is a battery as a power source, and in this embodiment, two single 1.5V manganese batteries are connected in series to generate an electromotive force of voltage _Vcc1 (3V).

9 is an electronic unit, and each circuit is put together.

The electromagnetic safety valve 1 has suction coils 11 and 3.7 which open the valve body by energization. ) And retaining coils 12, 500 for maintaining the valve open state by energizing after suction. ) Is installed at the most upstream of the gas pipe (21).

The gas burner 2 is installed below the heat exchanger 31, and gas is supplied and combusted by the gas pipe 21. The gas pipe 21 is provided with an automatic safety valve 1, a gas governor valve 211, a hydraulic automatic gas valve 212 and a capacity regulator 213 connected to the water governor 323 from an upstream side.

The hydraulic automatic gas valve 212 is connected to the water governor 323 by an interlocking rod 42, and opens when the water flows in the heat exchange water passage 3.

The capacity regulator 213 is connected to the capacity adjustment knob 214 and allows a gas to pass through in an amount corresponding to the sliding amount of the capacity adjustment knob 214.

The heat exchange water passage 3 is configured such that a water supply pipe 32, a heat exchanger 31, and a tapping pipe 33 are provided in this order.

The water supply pipe 32 is provided with a hot water amount regulator 325 connected to a hot water opening and closing device (not shown), a water filter 321, a water governor 323, and a hot water temperature adjusting knob 324.

The water flow switch 4 inserted between the battery 92 and the regulator 91 is connected to an interlocking rod 42 connecting the water governor 323 and the hydraulic gas valve 212. 41 is 'on'.

The ignition circuit 5 is comprised by the igniter timer circuit 51 and the igniter drive circuit 52 which applies the high voltage for ignition to the ignition electrode 521 provided toward the gas burner 2.

The igniter timer circuit 51 transmits the "on" signal 511 to the igniter drive circuit 52 for 5.5 seconds from the power supply start by energizing the contact 41.

The igniter driving circuit 52 generates a high voltage for flame discharge while applying the 'on' signal 511 to the ignition electrode 521. In addition, since the current consumption is relatively large, the voltage _Vcc1 is used as the operating power.

The ignition detection circuit 8 is a circuit which detects the flame current by applying an alternating current voltage (about 100 V) for flame current detection to the flame rod 800 provided toward the gas burner 2, and detecting the flame current ( Upon detection of ignition) the 'on' signal 81 is sent to the transistor 14. In addition, the voltage _Vcc2 is used as the operating power.

Moreover, in the case of gas (propane gas, natural gas) with large calorific value, it ignites faster than the case of gas (city gas) with small calorific value.

The suction timer circuit 6 is composed of a comparator, a CR charging circuit and the like. When the stabilization voltage V _REG is supplied as the timer operation start signal, the suction timer circuit 6 transmits an 'on' signal 61 to the transistor 13 for 0.4 seconds.

The transistor 13 is provided between the suction coil 11 and the battery 92 and is energized while the 'on' signal 61 is being input to flow a suction current to the suction coil 11.

As shown in FIG. 7, the holding timer circuit 7 includes a comparator 71, a resistor 72 (resistor for setting time), a resistor 73 (resistor for shortening time), a resistor 74, a resistor 75, 76, partial pressure resistance), an electrolytic capacitor 77, and the like. When the stabilization voltage V _REG is supplied as the timer operation start signal, the ON signal 70 is sent to the transistor 14 for 5.5 seconds (without the resistor 73) or for 3 seconds (with the resistor 73). Send it out.

As shown in FIG. 8, at the time of factory shipment, the resistor 73 is not actually mounted on the substrate 700 (for the natural gas use area), and the resistance symbol 731 is placed on the upper surface of the substrate 700. As shown in FIG. The white frame 732 and the R1 mark 733 are silk printed, and the hole 734 is open. In the city gas use area, the resistor 73 is actually mounted on the substrate 700.

The transistor 14 is provided between the holding coil 12 and the OUT terminal 911, and is energized while the ON signal 70 or the ON signal 81 is being input, and the holding coil 12 is turned on. The holding current flows to maintain the electronic safety valve (1) open.

Next, the operation of the gas instantaneous water heater A will be described based on the flowcharts of FIG. 4, FIG. 5, and the timer chart of FIG. 6 (when there is no resistance 73).

With respect to the start of use of the instrument (see FIG. 4), when the user opens the hot water supply opening and closing device (step s1), the water flow switch 4 is turned 'on' (step s2), and the IN terminal 910 of the regulator 91 is opened. The voltage V _cc2 is supplied to the power supply, and the stabilization voltage V _REG is generated at the OUT terminal 911.

The following operation is performed in step s3 by the start of power supply of the stabilization voltage V _REG .

The igniter timer circuit 51 sends an 'on' signal 511 to the igniter drive circuit 52, and the igniter drive circuit 52 applies a high voltage to the ignition electrode 521 to start a spark discharge. The suction timer circuit 6 transmits the 'on' signal 61 to the transistor 13, and the transistor 13 conducts to draw a suction current to the suction coil 11, so that the electronic safety valve 1 is closed. Open. The holding timer circuit 7 sends an 'on' signal 70 to the transistor 14, and the transistor 14 is turned on to send a holding current to the holding coil 12.

In step s4, the hydraulic automatic gas valve 212 is opened and the gas burner 2 is ignited (normal).

When the water flow switch 4 has elapsed 0.4 seconds from the start of the 'on' (YES in step s5), the suction timer circuit 6 does not transmit the 'on' signal 61 to the transistor 13, so that the transistor 13 ) Is 'OFF' and no suction current flows through the suction coil 11 (step s6).

When the flow switch 4 has elapsed 5.5 seconds from the start of the 'on' (YES in step s7), the timer timer 7 does not send the 'on' signal 70 to the transistor 14, so that the ignite timer The circuit 51 stops sending the 'on' signal 511 to the igniter driving circuit 52, so that the spark discharge stops (step s8).

In the normal case, the ignition detection circuit 8 detects the spark current in advance and sends the 'on' signal 81 to the transistor 14 (YES in step s9), so that the maintenance of the electronic safety valve 1 Continues.

If the voltage _Vcc1 is equal to or higher than 1.8V (YES in step s10), and a spark current is detected, the hot water supply is continued until the instrument stops using.

When no flame current is detected (incombustibility; FIG. 6 b), when the flame current is not detected (misfire; c in FIG. 6), or when the voltage _Vcc1 becomes less than 1.8 V (fire); In FIG. D), the confirmation lamp 93 continuously lights up, and the ignition detection circuit 8 stops sending the 'on' signal 81 to the transistor 14 (step s11). As a result, the electromagnetic safety valve 1 is closed.

When the user feels an abnormality and closes the hot water supply opening and closing device (step s12), since the water does not flow, the water pressure automatic gas valve 212 is closed (step s13), and the water flow switch 4 is 'off' and the confirmation lamp ( 93 is turned off (step s14).

When the user closes the hot water supply opening and closing device (step S1) to stop the use of the instrument (see FIG. 5), since the water does not flow, the hydraulic automatic gas valve 212 is closed (step S2), The gas burner 2 is extinguished (step S3), the water flow switch 4 is 'off' (step S4), and the electromagnetic safety valve 1 is closed (step S5).

Hereinafter, the advantages of the gas instantaneous water heater A of the present embodiment will be described.

(A) When the gas to be used is changed from gas (city gas) with low heat generation to gas (propane gas, natural gas) due to gas conversion work and moving, the serviceman shall replace parts such as gas burner (2). The lead wire is inserted into the hole 734, and the resistor 73 is soldered on the inner surface of the substrate 700.

In addition, when the user moves to an area using a gas (city gas) having a small heat generation amount, the resistance 73 (performed by a service man) may be removed.

Since these operations are easy to judge by the resistance symbol 731, the white frame 732, and the R1 display 733, the serviceman can be surely performed in a short time.

(B) The gas instantaneous water heater A shipped to an area using a gas (city gas) having a low heat generation amount is required to attach a resistor 73 to the substrate 700, and a gas having high heat generation amount (propane gas, natural gas). If production management is performed so as not to attach the resistor 73 to the area using the commonization of the substrate 700 can be made, manufacturers can reduce the management cost.

(C) The second timer time for passing the holding current through the holding coil 12 of the solenoid safety valve 1 can be set to a length (5.5 seconds / 3 seconds) suitable for the type of gas. In this case, ignition miss can be prevented, and when the gas having a large calorific value is used, leakage of gas (which occurs at the time of incombustibility) can be reduced.

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

a. The combustion apparatus of a 1st structure is applicable also to a gas table, a bath, etc. The power supply may be other than a battery. Moreover, although the time setting was shown to switch by attachment and removal of a resistor, you may switch by attachment and removal of a capacitor. It is also possible to switch by the resistance value of the variable resistor.

b. In the combustion apparatus of the second configuration (claim 1), the increase / decrease in the resistance value of the time-setting resistor includes the operation of a tap switch connected to a variable resistor and a resistor of another resistance value, the removal of the resistance, and the resistance of the resistance. It can carry out by replacing | exchanging and cutting the jumper wire which jumper jumps a specific resistance.

c. The second timer time may be configured to be set in multiple stages or without stages.

d. The solenoid valve may serve as suction and holding by one coil.

Claims (3)

An solenoid valve installed in the middle of a gas supply path for supplying gas to the gas butter, wherein the valve body is opened by energization; A heat exchange water passage having a heat exchanger heated by the gas burner; A water flow switch whose one end is connected to the battery and whose contacts are 'ON' when the water flow flowing in the heat exchange path is detected; A switch element electrically connected between the solenoid valve and the other end side of the water flow switch; An ignition circuit for starting an ignition operation when the water flow switch is 'on'; A maintenance timer circuit electrically connected to the other end of the water flow switch and outputting an 'on' signal to the switch element for the predetermined time when an operation power is supplied; A safety circuit electrically connected to the other end of the water flow switch, starting detection of the combustion flame when the operating power is supplied, and transmitting a 'on' signal to the switch element while the combustion flame is detected; A combustion apparatus comprising a combustion apparatus, characterized in that the predetermined time of the holding timer circuit can be arbitrarily set. The holding timer circuit of claim 1, wherein one end of the comparator is electrically connected to the other end of the water flow switch through a voltage dividing resistor, the other end of the comparator is grounded through a time setting resistor, and the electrolytic capacitor is further connected. And an electrical connection to the other end side of the water flow switch, wherein the increase or decrease of the predetermined time is performed by changing the resistance value of the time setting resistor. The combustion apparatus according to claim 2, wherein the predetermined time is shortened by connecting a time shorting resistor to both ends of the time setting resistor.