JPS5816089B2 - Gas burner ignition system for gas refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas burner ignition device suitable for application to gas refrigerators, particularly gas refrigerators mounted on vehicles or ships.

BACKGROUND ART Conventionally, in a gas combustor, a device that combines a flame detector and an ignition device that utilizes the conductivity of flame, etc. has been put into practical use.

In such devices, the flame detection electrode and the ignition electrode are either separate or integrated, but in this type of conventional device, the equipment used is not sensitive to the surrounding environment. It is often used for equipment used in environments where it is statically installed (for example, near conditioners that use gas fuel) and easy to maintain.

Therefore, the space occupied by the equipment as a control device is relatively large (
This makes it easy to set up double or triple safety functions.

By the way, gas refrigerators are suitable for being installed in, for example, camping cars, ships, etc., which cannot use commercial power sources, such as so-called compression refrigerators, and are used as equipment for these vehicles.

However, as is well known, refrigerators are not intended for short-term use. It also requires performance.

If this is the above-mentioned car-mounted refrigerator that runs on gas fuel, in addition to the performance mentioned above, due to its nature, the installation space etc. needs to be minimized considering the installation location, and the usage environment changes due to movement. Due to the fact that the combustion air is likely to be affected by the combustion air vents, etc., performance such as maintaining stable flame combustion with almost completely automatic control, ensuring the safety of passengers, and being maintenance-free is required.

Therefore, the above-mentioned conventional combustion control device cannot simply utilize the mechanism, but must take into consideration the problems unique to gas refrigerators as described above.

In view of the above circumstances, the present invention has been provided, which integrates electrodes for ignition and flame detection, and further provides quick combustion operation unique to gas refrigerators to prevent failures in the ignition function and flame detection function. The aim was to provide an excellent device that would ensure safe operation (appropriate measures could be taken).

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a system diagram of the electric circuit and gas supply path of the ignition device that is the basis of this invention.

In the figure, a gas passage leading to a gas burner 1 is connected to a safety valve SV including a thermocouple type electromagnetic adsorption valve 3b and a regulating valve 2 that can detect the temperature inside the refrigerator and vary the gas flow rate.

This safety valve Sv has a push-and-turn type opening/closing mechanism, and has a well-known configuration in which an adsorption valve 3b, which is urged by a spring 3e, can be adsorbed and held by an electromagnet 3 by the electromotive force of a thermocouple 4, and by suppressing the operating shaft 3a. Press the adsorption valve 3b against the electromagnet 3,
The valve can be opened by rotating the cock 3d.

The ignition and detection section consists of an electric circuit connected by a power source 5OURCE and a switch SW that interlocks with a safety valve SV.
This electrical circuit connects the high voltage generator IG to the flame detector FS b
It is connected to the power supply 5OURCE via the contact Fsb.

Generator IG, detector FS ignition electrode and flame detection rod are:
They are integrally constructed as a common frame rod FL.

This operation will be explained.

Assuming that the main cock of the gas passage (not shown) is open, when the suction valve 3b is pressed against the electromagnet 3 by pressing the operating shaft 3a of the safety valve SV and rotated to open the valve, gas is supplied to the gas burner 1 and the operation is performed. Switch S interlocked with shaft 3a
When W is closed, discharge is started by the flame rod FL serving as an electrode of the high voltage generator IG, and the gas blown to the gas burner 1 is ignited to generate a flame.

This flame is detected by the thermocouple 4, that is, the electromagnet 3 is actuated by the thermoelectromotive force, and the suppression operation is continued until the adsorption valve 3b is attracted and held.

In addition, before this adsorption and holding, the flame detector FS also senses the continuity of the flame and operates, contact Fsb';x opens, and the high voltage generator IG
stop the discharge.

After this ignition, if the flame disappears for some reason, the flame rod FL immediately detects the flame extinction and connects the contact Fsb.
is closed to start discharging the high voltage generator IG and re-ignite it.

In this case, the electromotive force of the thermocouple 4 generally attenuates with a time delay, so the safety valve SV is not immediately closed.

Next, when the operation is to be stopped, rotate the operating shaft 3a of the safety valve SV to switch the cock 3d to stop the gas supply, and at the same time operate the switch SW linked to the operating shaft 3a to open it and connect to the electric circuit. Cut off.

Eventually, the thermocouple 4 senses this state and releases the holding state of the suction valve 3b by the elasticity of the spring 3e, returning the suction valve 3b to its original position.

Incidentally, the size of the flame is automatically adjusted by the regulating valve 2 according to the temperature inside the refrigerator.

FIG. 2 shows an embodiment in which a timer T is added to the electric circuit to limit the discharge time of the high voltage generator IG.

In the figure, the basic configuration is the same as that in Figure 1, but a timer circuit is added, that is, the timer T is connected to the power source 5OURCE.
The a-contact Ta, diode D1, and timer T are connected in series, and a circuit in which the a-contact Ta and diode D1 are connected in series with the b-contact Tb of the timer T, the b-contact Fsb of the flame detector FS, and the diode D2 is connected in parallel. Furthermore, it is connected to the power supply side of the high voltage generator IG between the b contact Fsb and the diode D2.

This operation will be explained.

By pushing and turning the operating shaft 3a, the safety valve Sv is opened,
When the switch SW linked with this is closed, the power supply is 5OURC.
When an electric circuit is connected to E, power is applied to the high voltage generator IG via contacts Tb and Fsb, causing discharge to start in the flame rod FL and igniting the gas blown out to the gas burner 1.

The thermocouple 4 detects this flame, and the adsorption valve 3b of the safety valve SV
The process of adsorbing and holding is the same as in the previous example.

In addition, the flame detector FS detects the flame at the same time as it occurs,
This b contact Fsb is opened to cut off the power supply to the high voltage generator IG to stop the discharge and also to prevent the timer T from timing up.

As in the previous example, when the flame in the gas burner 1 goes out, the flame detector immediately detects this and activates the high voltage generator IG via the b contacts Fsb and Tb to reignite the flame.

At this point, even though the high voltage generator IG was normally discharged and the gas burner 1 was ignited, the flame detector FS
If a failure occurs such that contact Tb does not operate,
, Fsb, and the diode D2, the timer T is energized, and after the set time has elapsed, the contact Ta is closed, the timer T is self-maintained, and the contact Tb is opened, so that the power to the high voltage generator IG is cut off. The discharge is stopped.

The subsequent disappearance of the flame is detected by the thermocouple 4, and the safety valve SV is activated to cut off the gas supply.

Note that the diodes DI and D2 are used to prevent so-called sneak current when a DC power source is used.

The valve closing operation by other manual operations is exactly the same as the previous example.

According to this embodiment, the timer T
This can be determined by the operation of the

In these embodiments, the a contact Fsb1 of the flame detector FS and the auxiliary contact T of the timer T are used to know the operating state of the device.
Using a1, it is also possible to display the ignition confirmation and alarm display using the lamp L.

This is shown in FIG.

FIG. 4 shows an example in which a buzzer BZ is used to emit a warning sound instead of a lamp.

Further, it is also possible to configure a switch for opening and closing the defrosting device to be interlocked with the operation shaft.

□As described below, the present invention has a safety valve equipped with a regulating valve that can vary the gas flow rate depending on the internal temperature and a thermoelectric adsorption valve connected to the gas passage leading to the gas burner, and is connected to the gas passage leading to the gas burner. An electric circuit is formed that includes a flame detector, a flame rod serving as a common electrode thereof, and a contact point of the flame detector that controls the operation of the generator, and a power switch for these is linked to the operation of the safety valve. At least turn on the power.

In the event that the burner flame is extinguished while the burner flame is extinguished, the flame detector activates the high-voltage generator before the safety valve closes and automatically re-ignites the fire. It is very convenient because if the fire goes out, the fire can be re-ignited automatically during that time without having to manually re-ignite each time. At the same time, interruption of the cooling operation can be prevented as much as possible, and the contents in the refrigerator will not be adversely affected.

Further, as described above, since the desired purpose can be achieved with a simple configuration, it is possible to provide an optimal device for use in gas refrigerators, which have many restrictions in terms of usage of installation space and functionality.

Furthermore, if a timer is inserted in the above control circuit,
Even if the high-voltage generator does not stop operating and continues discharging due to a malfunction of the flame detector during burner combustion, the timer can reliably stop discharging after a predetermined period of time, preventing unnecessary discharge. Therefore, reliability can be further improved.

[Brief explanation of drawings]

FIG. 1 shows a system diagram of the electric circuit and gas supply path of the ignition device that forms the basis of this invention. FIG. 2 shows an embodiment of the present invention based on the configuration circuit diagram explained in FIG. Figure 3 shows the ignition confirmation and alarm display circuit. Figure 4 shows the ignition confirmation display and warning sound generation circuit. 1...Gas burner, 2...Adjusting valve, 3
b... Adsorption valve, 4... Thermocouple, Sv.
...Safety valve, FS...Flame detector, IG...
...High voltage generator, FL...Frame rod, T...Timer, SW...Switch.

Claims (1)

[Claims] 1. A safety valve including a regulating valve that can vary the gas flow rate depending on the internal temperature and a thermocouple adsorption valve is connected to the gas passage leading to the gas burner, and includes a high voltage generator, a flame detector, and a safety valve that includes a thermocouple adsorption valve. It is equipped with a flame rond as a common electrode, a timer, and a B contact of a flame detector that controls the operation of the generator. These electrical circuits are connected in parallel between the A contact of the timer and the timer, the B contact of the timer and the B contact of the flame detector, and the circuit consisting of the A contact of the timer and the timer. The power supply side of the high voltage generator is connected between the and the timer, and these power switches are linked to the operation of the safety valve, so that when the burner flame is extinguished after the power is turned on, the safety valve is closed. Automatic re-ignition is possible before the valve operates, and if the high-voltage generator does not stop operating even during burner combustion, the generator circuit is opened after a predetermined time by the timer. Gas burner igniter for gas refrigerator.