JPS6093224A - Pulse operated combustion device - Google Patents

Abstract

PURPOSE:To enable a proper control over combustion and improve safety and reliability without being influenced by a turned-ON or a turned-OFF condition of suction by a method wherein a holding circuit for holding a detected condition when the sensor detects an operation of an energization fan at once is provided. CONSTITUTION:An air pressure switch 9 is turned on by a pneumatic pressure suctioned when a purging is performed in advance by a fan 2, a relay 23 is operated to close a contact point 23a and to form a self-holding circuit. Further, by closing of contact point 23b, a solenoid valve 5 is released by a driving circuit 24, fuel is supplied to a combustion part 4 and a pulse operated combustion is started by an ignition electrode 6a. Then, the operation of the fan 2 is stopped, the air pressure switch 9 repeats its turned-on or turned-off condition as the flap valve 3 is opened or closed, and a supplying of fuel under an operation of the solenoid valve 5 can be continued with a self-holding of the relay 23. When a fire sensor 10 detects a stopped operation or a misfire at the combustion part 4, a clear contact point 22 is released and then the self-holding circuit for the relay 23 is reset.

Description

[Detailed description of the invention] (Technical field of Jj Ming) This Komyo IJ is a pulse fuel lA + that mixes inhaled air and fuel, performs pulse combustion, and directly utilizes the combustion reaction heat. .

[Zatmei's technique j (j's background)]

In recent years, there has been an extremely high level of awareness of soil conservation not only in industry but also in home appliances, and there has been a growing demand for higher efficiency for household heat sources. In order to meet these demands, a pulse combustion machine has been developed and put into practical use by applying Pulse Diera 1 to combustion and directly utilizing the combustion reaction heat.

In other words, when starting operation, this pulse combustion machine operates a startup fan installed in the intake pipe to introduce air into the combustion section, mixes the air with fuel, and ignites it with an igniter. This starts pulse combustion. after that,
The startup fan stops operating, but air continues to be taken in by opening and closing the flapper valve (located in the intake pipe between the combustion section and the startup fan) based on pressure changes within the combustion section. It has become. The igniter also stops operating, but the heat remaining in the combustion section continues to ignite.

By the way, in such a pulse combustion machine, combustion (fuel supply and igniter operation) is started after the start-up fan has started operating to ensure exhaustion of residual gas in the combustion section and reliable ignition. Need to start. To deal with this, it is conceivable to install a wind pressure switch in the intake pipe, and if this wind pressure switch is on, it is assumed that the fan is operating, and combustion is started.

(Problems with background technique 1fj) However, in a pulse burner, the intake air is turned on.

To turn it off, the wind pressure switch is also turned on.

As a result, proper combustion control becomes difficult and there is a problem in terms of safety.

[Purpose of the invention]

This invention was made in view of the above circumstances,
The purpose is to turn on the intake air.

It is an object of the present invention to provide a pulse combustion machine with excellent safety and reliability that enables proper combustion control without being affected by off-state conditions.

[Summary of the Invention] The present invention provides a detector that detects the operation of a startup fan, a holding circuit that maintains the detected state once the detector detects the operation of the startup fan, and a holding circuit that detects the operation of the startup fan. Means for resetting upon stopping is provided, and when the detector detects operation of the startup fan, combustion in the combustion section is started.

[Embodiments of the invention]

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

In FIG. 1, reference numeral 1 denotes an intake pipe, and a starting fan 2 and a flapper valve 3 are sequentially disposed in the middle of the intake pipe 1. As shown in FIG. Thus, air taken in through the intake pipe 1 is supplied to the combustion section 4. This combustion section 4 mixes the air sucked in with fuel supplied from a fuel supply source (not shown) via a solenoid valve 5, and sends the mixture to an igniter (ignition electrode 6a).
The spark produced by the engine ignites the engine and starts pulse combustion. High temperature obtained by pulse combustion in the combustion section 4.

The high-pressure combustion gas is supplied to a heat exchanger (not shown) through the exhaust pipe 7, where heat is removed and then exhausted to the outside. Therefore, the combustion section 4 is located in the intake pipe 1 and the exhaust pipe 7.
An air bypass pipe 8 is disposed so as to straddle the air bypass pipe 8, and a detector such as a wind pressure switch 9 is installed in the middle of the bypass pipe 8.
will be placed. Note that the combustion section 4 is provided with a flame detector 10.

On the other hand, 20 is a control section, and the output of the wind pressure switch 9 and the output of the flame detector 10 are supplied to this control section 20.

Further, the control section 20 controls the fan 2. The electromagnetic valve 59 controls the driving of each of the ignition lances 1 to 6t of the igniter.

FIG. 2 shows the main parts of the control section 20. That is, 21 is a main control section, and a relay 23 is connected to a power terminal of this main control section 21 via the wind pressure switch 9 and a clear contact (for example, a relay contact) 22 in series. The normally open contact 23a of the relay 23 is connected in parallel to the wind pressure switch 9. Reference numeral 24 denotes a solenoid valve drive circuit which operates the solenoid valve 5 in response to a drive command supplied from the main control unit 21 via the normally open contact 23b of the relay 23 or a control command from a safety device (not shown). It controls the drive. Note that the clear contact 22 is controlled by the main control section 21.

Next, the operation in the above configuration will be explained.

When the operation start operation is performed, the fan 2 starts operating and external air is sucked into the intake pipe 1 and introduced into the combustion section 4 through the flapper valve 3. As a result, incomplete combustion gas remaining in the combustion section 4 is discharged to the outside through the exhaust pipe 7 (pre-purge). At this time, the wind pressure switch 9 is turned on due to the pressure of the air being sucked in.
Relay 23 operates. When the relay 23 operates, the contact 23a closes to form a self-holding circuit.

Further, the contact 23b is closed, a drive command is supplied to the drive circuit 24, and the solenoid valve 5 is opened. In this way, fuel is supplied to the combustion section 4, and the fuel is mixed with the introduced air. This mixed gas is ignited by a spark generated at the ignition electrode 6a, thereby starting pulsed combustion.

After that, the operation of the fan 2 is stopped, but the flapper valve 3 repeats opening and closing due to pressure changes in the combustion section 4, so that air continues to be sucked.

In addition, in this case, the wind pressure switch 9 is repeatedly turned on and off as the flapper valve 3 is opened and closed, but the solenoid valve 5 continues to supply fuel because the valve 23 is self-holding.
Ru. Furthermore, although the operation of the igniter stops, the ignition continues due to the heat remaining in the combustion section 4. In other words, pulse combustion continues. However, the high temperature obtained by pulse combustion,
The high-pressure combustion gas is supplied to the heat exchanger by the exhaust pipe 7, where heat is removed and then exhausted to the outside.

After that, if a shutdown operation is performed, if the combustion part 4 misfires and the flame detector 10 detects it, or if the flame rond (not shown) voltage of the combustion part 4 becomes zero due to a misfire, for example, a safety warning occurs. After a certain period of time due to the operation of the device, the clear contact 22 opens, the self-holding circuit of the relay 23 is reset, and the operation is then stopped.

For reference, pressure changes on the combustion section side of the flapper valve 3 are shown in FIG. In other words, the single point 8t4 line is the pressure horn (positive pressure) when ignition takes place in the combustion section 4.
, the solid line indicates that the flapper valve 3 is opened and closed due to the pressure generated when exhaust is performed, and intake is turned on and off. Note that the broken line indicates the pressure of combustion air in the combustion section other than the pulse combustion machine.

In this way, the wind pressure switch 9 detects the operation of the fan 2.
and a relay 23 that operates when the wind pressure switch 9 is turned on to -H and maintains its operating state,
Since pulse combustion is started in response to the operation of this relay 23, proper combustion control is possible regardless of whether the intake air is on or off, and safety and reliability are improved by 8.
1 will be.

FIG. 4 shows a modification of the main parts of the control section 20. In FIG. 4, a drive circuit 24 is connected to the power supply terminal of the main control section 21 via the emitter and collector of a PNP transistor 31. The base of the transistor 31 is grounded through a resistor 32 and the collector-emitter of an N-type resistor 33 on the UNPNN. Further, one end of the wind pressure switch 9 is connected to the power terminal of the main control unit 21, and the wind pressure switch 9
The other end is grounded via a resistor 34. The collector of the first transistor 31 is connected to the interconnection point of the wind pressure switch 9 and the resistor 34, and the base of the transistor 33 is connected via the Zener diode 35 and the resistor 36 in series. Thus, the interconnection point between the Zener diode 35 and the resistor 36 is connected to the signal pano J terminal of the main control section 21 via the diode 37 in the forward direction.

1, when the fan 2 starts operating and the wind pressure switch 9 is turned on, the transistors 1 to 33 are turned on, and accordingly, the transistors 1 to 31 are also turned on. In this way, when the transistor 31 is turned on, the drive circuit 24 is operated and the solenoid valve 5 is opened. Facing each other, 1 to 3 transistors 1]
The voltage generated in the resistor is now supplied to the bases of the transistors 1 to 33 via the resistor 36J3 and the Zener diode 35, and the transistors 1 to 33 are connected to the positive pressure switch 9.
The f71 remains on until it is turned off. While the i-transistor 33 remains on, the l-transistor 31
In other words, a holding circuit is formed that maintains the on state, and the opening operation of the solenoid valve 5 continues. While pulse combustion is being carried out in this manner, the operation may be stopped or the combustion section 4 may misfire, which can be detected by the flame detector 10.
When the flame rond (not shown) voltage of the combustion section 4 becomes zero due to detection or misfire, for example, after a certain period of time due to the operation of a safety device, the cathode of the Zener diode 35 is grounded via the diode 37, and 1-
The transistor 33 is turned off. When transistor 33 turns off, the holding circuit for transistor 310 on is reset, and operation is then stopped.

In the above embodiment, a holding circuit is formed to ignore the operation of the wind pressure switch 9 during pulse combustion, but the holding circuit is formed only for a certain period of time from the start of pulse combustion. After that, the operation of the wind pressure switch 9 may be monitored for safety. Also,
Although a wind pressure switch is used as a detector for detecting the operation of the startup fan 2, a detector that directly detects the rotation of the fan 2 may be used. In addition, we set the rets 1 to 1 of the holding circuit to +J when operating the external dimensions, but the rehits are constant due to the sequence check of C (checking whether the circuit operates normally) at the start of operation or the operation of the safety device. It may be done after some time. In addition, this light is not limited to the above-mentioned embodiments, and it goes without saying that various modifications may be made without changing the gist of the invention.

(Effects of the Invention) As stated above, the present invention provides a pulse combustion machine with excellent safety and reliability that enables proper combustion control without being affected by intake ON/OFF. Can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is an overall configuration diagram, FIG. 2 is a configuration diagram of the main parts of the control section, FIG. 3 is a diagram showing the pressure near the frame rod, and FIG. FIG. 4 is a configuration diagram showing a modification of FIG. 2. DESCRIPTION OF SYMBOLS 1... Intake pipe, 2... Start-up hood, 4... Combustion part, 7... HF trachea, 9... Wind pressure switch (detector), 20... Control part. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4

Claims (1)

[Claims] An intake pipe, a startup fan installed in this intake pipe,
The detector that detects the operation of the startup fan includes a combustion section that mixes the air and fuel taken in through the first field trachea and burns the mixture in pulses, and once the detector detects the operation of the startup fan, the a holding circuit that holds the detection state;
A pulse combustion machine characterized by comprising means for resetting the holding circuit when starting or stopping operation, and means for starting combustion in the combustion section when the detector detects operation of the startup fan.