The present invention relates to a structure of a gas ignition apparatus, more specifically, a gas valve.
A conventional gas valve 1, as illustrating in
However, the valve fatigue or residue inside the valve body may cause the solenoid valve functioning abnormally, and once the pilot passage 6 can't be opened or shut properly, it affects the function of the gas valve, and the gas leaking may put the operator in a dangerous condition. Therefore, to provide a gas valve with better safety has become the primary objective of the present invention.
To solve above identified defect, the present invention relates to a gas valve having two solenoid valves installed in the pilot passage, which can be realized by having a gas valve comprising a valve body and at least two solenoid valves. The valve body includes an inlet passage and a pilot passage. Said pilot connects to the inlet passage and a pilot ignition device set outside the valve body. Gas is led into said valve body through the inlet passage, passing said pilot passage, and is brought into the pilot ignition device. The two solenoid valves are disposed separately in the pilot passage by a predetermined distance. Said solenoid valves can open and shut the pilot passage, and when one of the solenoid valve opens incorrectly, another valve will remain shut, serving as an auxiliary to improve safety measure of the gas valve.
The preferred embodiments of the present invention are described in details hereinafter according to the appended drawings.
Referring to
Said two solenoid valves can be a first and a second solenoid valve (20, 30); said first solenoid valve (20) is set in a first valve chamber (21), which is disposed in the inner passage (12A) of the valve body (10), while said second solenoid valve (30) is set in a second valve chamber (31), which is also disposed in the inner passage (12A) of the valve body (10). Both valves (20, 30) are disposed separately in the pilot passage by a predetermined distance.
The gas valve (100) may further include a pilot shutting element (40), which is provided in a third valve chamber (41) of the valve body (10). Said third valve chamber (41) connects with the inlet passage (11) and also connects to the first valve chamber (21) by a first guide way (124). The first guide way (124) can connects to the inlet passage (11) through a first channel (121). The pilot shutting element (40) is triggered by the first solenoid valve (20) to be opened or shut synchronizingly. Thus, when the first solenoid valve (20) opens, the pilot shutting element (40) is also triggered to open, delivering gas flow to the pilot ignition device (99) passing the second solenoid valve (30); as the first solenoid valve (20) closes, it will trigger the shutting element (40) to cut the gas flow off.
A gas passage (13) can further be employed inside the valve body (10).
The gas passage (13) is connecting to the third valve chamber (41); said gas passage (13) connects to the first valve chamber (21) through a second channel (122) and connects to said second valve chamber (31) through a third channel (123). Said gas passage (13) can deliver gas to a burning unit (not shown).
The gas valve (100) further includes a gas solenoid valve (50) and a gas shutting element (60) are further provided; the gas solenoid valve (50) is set in a forth valve chamber (51) of the valve body (10), and the gas shutting element (60) is set in a fifth valve chamber (61) disposed in the gas passage (13). Both forth and fifth valve chambers (51, 61) are connecting through a second guide way (125) and the gas passage (13) is connecting to the second guide way (125) through a third guide way (126). The gas shutting element (60) is triggered by the gas solenoid vale (50) to be opened or shut synchronizingly. Thus, when the gas solenoid valve (50) closes, the gas shutting element (60) is also triggered to close the gas passage (13), cutting off the gas flow for avoiding the gas entering the pilot ignition device (99); and when the gas solenoid valve (50) opens, the gas shutting element (60) will be triggered to open the gas passage (13), delivering gas flow to said burning unit.