JPS6259311A - Safety device for combustion - Google Patents

Abstract

PURPOSE:To make it possible to check a trouble in a relay dependently on whether or not an ignitor is beforehand driven when igniting a burner by constituting a drive circuit for an ignitor so that only its drive circuit is closed when a relay is normal. CONSTITUTION:The ignition operation for a burner 2 is made by an operation element, and at the same time an electromagnetic safety valve 1 is pushed and opened. Further, a change-over switch 18 is changed over to the side of a dry battery 19 and the charged current flows to a condenser 20, and the current flows to a relay 21 and the relay 21 is energized and operated, closing its contact point 21a. The current from a dry battery 19 flows to a change-over switch 18, a reset relay 8, an ignitor 17 through said contact point 21a, driving the ignitor 17 and igniting a burner 2. Incidentally in this case, since the ignitor 17 is not driven unless a current does not flow to a reset relay 8 which is a relay for opening a drive circuit 6, it is possible to check whether or not said reset relay 8 has a cut wire trouble by discriminating whether an ignitor 17 is driven or not.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a combustion safety device that organically combines an OO sensor or other incomplete combustion detection element and a relay.

(Prior Art) The applicant of the present application has previously developed an electromagnetic safety valve C as shown in FIG.
operating solenoid d and a thermoelectric element e facing the burner a.
a drive circuit f for the electromagnetic safety valve 0, a drive circuit 1 for the ignition 3, which connects the igniter g that ignites the burner a, and its power source; and an OO sensor and other incomplete combustion detection elements j. proposed a relay that is energized to open the drive circuit of the electromagnetic safety valve C when a gas concentration higher than a set value is detected.

(Problem to be solved by the invention) The above method is convenient because it operates on the safety side, that is, the electromagnetic safety valve closes when an element or circuit other than the relay is disconnected, but the relay In the following case, the drive circuit f of the electromagnetic safety valve 0 will fail even if the gas concentration exceeding the set value is detected by the incomplete combustion detection element
remains closed, and the electromagnetic safety valve O is kept open, resulting in the inconvenience that incomplete combustion gas is released.

(Means for Solving the Problems) The present invention provides that when the relay itself has a disconnection failure,
A device that detects this in advance and prevents the above inconvenience from occurring! 1', and the solenoid for operating the electromagnetic safety valve interposed in the fuel supply path to the burner and the heat 1! The υ setting value is determined by the drive circuit of the electromagnetic safety valve that connects the element, the drive circuit of the igniter that connects the igniter that increases the burner and its power supply, and the 00 sensor and other incomplete combustion detection elements. A relay that is energized to open a drive circuit for the electromagnetic safety valve when a gas concentration higher than or equal to the above gas concentration is detected, and is configured so that the drive circuit for the igniter is closed only when the relay is normal. It is characterized by what it did.

(Function) According to the above configuration, if the relay that completely closes the drive circuit of the electromagnetic safety valve is disconnected, the igniter will not be driven, so when the burner is ignited, the igniter is not activated. It is possible to check whether the relay is malfunctioning by checking whether the igniter is activated or not, and if it is malfunctioning, the operation of the burner's combustor can be immediately stopped, so that there is no malfunction during combustion of the burner. Even if the complete combustion detection element detects a gas concentration higher than a set value, the above-mentioned disadvantage that the electromagnetic safety valve is kept open can be prevented.

(Example) Next, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows a first embodiment of the present invention, in which (1) is an electromagnetic safety valve installed in a gas supply path (3) which is a fuel supply path to a burner (2), and (4) is an electromagnetic safety valve installed in a gas supply path (3) which is a fuel supply path to a burner (2). 2) shows a thermocouple which is a thermoelectric element, and connects the operating solenoid (1&) of the electromagnetic safety valve (1) and the thermocouple (4) through the contact (5a) t- of the latching relay (5). Connect the drive circuit (6) of the electromagnetic safety valve (1), in other words, the burner (2)
A safety circuit was constructed in the event of a misfire.

The latching relay (5) is a set relay (7) and a reset relay (8) which is a relay that fully opens the drive circuit (6).
and a small capacitor (9), the capacitor (
9) When the battery is charged, the charging current causes the
The IJ relay 7) is energized to close the contacts (5a), and when the potential at the 0 point (described later) drops to approximately zero potential, the IJ relay 8) is energized to close the contacts (5& ) are nine things to open.

In addition, 0■ is a CO sensor (il) which is an incomplete combustion detection element.
When a gas concentration higher than a set value is detected by l, the reset relay (8) is fully energized and the electromagnetic safety valve f is activated.
This shows an incomplete combustion detection circuit that closes the valve i+. (Tep N p type through 141) and connect the connection point 0 between the collector of the transistor (Is and the resistor CIGI) to the capacitor (9) of the latching relay (5). (Constructed by connecting the old emitter to the 00 sensor (ill).

Furthermore, (17) is the igniter of the burner (2), and in the US, when the igniter (2) is operated, the movable contact (18a) switches to the dry battery (11 side) that serves as the power source, and when the extinguishing operation is performed, the original stop occurs. (to) is a capacitor charged by the dry battery α→, Cυ is a relay activated by the charging current of the capacitor (■), and the igniter circuit and the dry battery (11) are The changeover switch (IF!J1) was connected to the reset relay (8) through the normally open contact (21a) of the relay (2t+) to constitute a drive circuit 03 for the igniter (17).

In Fig. 1, [231124112!19] is a resistor for current adjustment, (5) is a capacitor that prevents the incomplete combustion detection circuit 00 from malfunctioning in response to pulse abnormal occurrence of CO gas, (2) is the set relay mentioned above. (7) Fully energized N
(7) is a PNP transistor that amplifies the base current of the transistor CI, and Gυ is a backflow prevention diode.

In the above configuration, when the ignition operation of the shivana (2) is performed using an operator (not shown), the electromagnetic safety valve (1) is pressed open and the changeover switch aυ is switched to the dry battery α3 bias. , a charging current flows through one example of the capacitor, and that current flows through the relay I2υ and the relay C! υ is energized, its contact (21m) closes,
The current from the dry battery Ql is 0 seconds at the changeover switch, the reset relay (8), the igniter (17), and the contact (21a).
t-, the igniter aD is activated and the burner (2) is ignited. In this case, the current flowing through the reset relay (8) is transmitted through the contacts (51) of the latching relay (51) interposed in the drive circuit (6) of the electromagnetic safety valve (1).
a) The extent to which Q does not open, that is, the reset relay (8) t
- It must be set to a value that will not cause it to operate.

Thus, the igniter αD is not driven unless current flows through the drive circuit +611-R relay (7) IJ relay 8), so whether or not the igniter αη is driven is determined. It is possible to check whether the reset relay (8) has a disconnection failure.

After this ignition operation, when the 00 concentration is at a normal value below the set value, the Oo7 sensor α1) is held at a high resistance value, and the potential at the voltage dividing point of the voltage divider α is held at a relatively low potential. Therefore, the transistor α is turned on, and the capacitor (9) of the setting relay (5) is charged by the dry battery 0, and the set relay (7) is energized during the short time when the charging current flows. , its contacts (5&) are closed, and the drive circuit (6) of the electromagnetic safety valve (1) is closed. At this time, since the burner (2) is burning as described above, the thermocouple (4) is heated by the burner (2) K and generates a predetermined electromotive force, and the electromagnetic safety valve ( 1) Enough current can be passed to keep the valve fully open, and combustion in the burner (2) can be continued.

Also, when the COg degree reaches an abnormal value higher than the set value during combustion in the burner (2), the thermocouple (4) is heated and generates a predetermined electromotive force, but the Oo sensor (11) changes to a low resistance value, and the potential at the voltage dividing point of the voltage divider α changes to a relatively high potential, so the transistor α9 is turned off and the reset relay (8) is energized, and the four points ( 5&
) opens and the thermocouple (4) activates the solenoid (1&).
The electromagnetic safety valve Tl) is closed, combustion of the burner 12) is stopped, and it is safe.

Further, when the burner (2) is in a combustion-stopped state or a misfire state, the thermocouple (4) is not heated, and the operation deviation in FIG. 2 shows the f42 embodiment of the present invention. ) t-Latching relay (as a relay to open)
Use a general relay ctzr instead of 5), and connect its contacts (
32a) If the t-normally closed type is used, and when the burner (2) is ignited, the relay t3av is energized by the current from the dry battery a9 via the changeover switch for 1 second, and when the energizing current is set to a large value, the relay t33t- Activate the contact (3)
2m) is once opened, and when the tt flow is set small, the relay C33'5I: is deactivated and the contact (3m) is opened.
2a)? If the gas concentration remains closed and there is no abnormality in the gas concentration, the incomplete combustion detection circuit αq is activated.
There is no particular difference from the one shown in ts1, except that the contacts (32 &) are closed by t-deactivation, and the drive circuit (6) of the electromagnetic safety valve (1) is closed.

FIG. 3 shows a third embodiment of the present invention; in this case,
Drive circuit (6) t- General relay which is a relay to open (
(to) contact (S S a) tsAlways connected to the electromagnetic safety valve (
The drive circuit (6) of No. 11 is not particularly different from the one shown in the second figure except that it is closed and serves as a switching contact that closes the drive circuit □□□ of the igniter αη during ignition operation. In this case, it is possible to further check whether the contact (33a) is operating correctly by checking whether or not the igniter η is activated.

Figure 1a4 shows the @4 embodiment of the present invention; in this case, the relay is a general relay (CM), which is connected in series with a capacitor wire, a relay 12υ, and a variable resistor (to) to a silane resistor that is activated by energization. The circuit Oet is connected in parallel, and when the burner (2) is ignited, the electromagnetic safety valve (11) is pressed open, and the current from the dry battery (19) is transferred to the relay (b) and the series connection circuit (to ) K flows, and the capacitor (to) is charged by the current, and the relay CD is energized to drive the igniter a?).After that, if the gas concentration is normal, the incomplete The relay (B) is energized by the combustion detection circuit α, the drive circuit (6) of the electromagnetic safety valve (1) is closed, and the electromagnetic safety valve (S) is held open.

In this case, the capacitor (2t) discharges 1! In order to speed up the process, the capacitor (■) and the changeover switch (a) are
Connect via the open/close switch (9) that opens when the cough selector switch a is switched to the dry battery α9 side, and also connect the relay C341 so that the relay (b) does not affect the driving of the igniter (tTI). The igniter was placed outside the drive circuit of <1η.

In FIG. 4, the other configurations are not particularly different from those in FIG. 2.

FIG. 5 shows a fifth embodiment of the present invention, in which case:
The opening/closing switch C37) of the one shown in the fourth figure is deleted, the change-over switch Oa is completely changed, and a reed relay is used as the relay Cυ, and there is no particular difference from the one shown in the fourth figure except for the following points.

FIG. 6 shows a sixth embodiment of the present invention, in which case:
A normally open switch (to) in parallel with the OQ sensor U, or a parallel connection circuit with a small resistor 01 in series with the variable resistor (12) and a normally closed switch (4 (lI) (4υ, or CO sensor fill) A normally closed switch (43) inserted in the connection circuit (c) with the resistor (to), or a series connection circuit (4
t9 is added to forcibly change the potential at the 0 point, and check whether the incomplete combustion detection circuit α [, the drive circuit (6)], the relay that fully opens, and the contacts of the relay are working properly. There is no particular difference from that shown in FIG. 5 except for the point t.

(Effects of the Invention) As described above, according to the present invention, when the incomplete combustion detection element detects a gas concentration higher than the set value, the relay that is energized and opens the drive circuit of the electromagnetic safety valve normally operates. Since the igniter drive circuit is configured to close only when plowing is in progress, the igniter is not driven before the combustor equipped with the burner enters normal operation, that is, when the burner is ignited. It is possible to check whether the relay, which plays an important role, is disconnected or not, and if it is determined that the relay is disconnected, the operation of the combustor can be immediately stopped. This has the effect of further improving the reliability of the combustion safety device, compared to a system in which the combustion safety devices are operated individually without being correlated with each other.

[Brief explanation of the drawing]

1 to 6 are circuit diagrams showing first to sixth embodiments of the device of the present invention, and FIG. 1 is a circuit diagram of the previously proposed device. 111...Solenoid safety valve (1&)...Operating solenoid (2)...Burner (3)...Gas supply path (fuel supply path) (4)...Thermocouple (thermoelectric element) +61 (23 ...Drive circuit +81...Reset relay (relay) (11J...
Oo sensor (incomplete combustion detection element) αη...Igniter
(13...Power supply (dry battery) (To) (33 (To)
...2 people outside the relay (relay)

Claims (1)

[Claims] A drive circuit for the electromagnetic safety valve that connects the operating solenoid of the electromagnetic safety valve interposed in the fuel supply path to the burner and a thermoelectric element facing the burner, and an igniter that ignites the burner and its power source are connected. and a relay that is energized to open a drive circuit for the electromagnetic safety valve when a gas concentration higher than a set value is detected by a CO sensor or other incomplete combustion detection element, A combustion safety device characterized in that a drive circuit for the igniter is closed only when the relay is normal.