Patent ID: 6032693
Filing Date: 2000-03-07
Classification: F23N,Y10T

Abstract:
A solenoid valve assembly for controlling gas supply comprising:a lower cover formed with a first chamber at an end thereof, a second chamber located adjacent to and communicating with said first chamber, a third chamber located adjacent to said second chamber, a fourth chamber located adjacent to and communicating with said third chamber, and a fifth chamber located at another end thereof and communicating with said fourth chamber, said first chamber being a horizontal passage having an inlet for connecting a gas supply and communicating with said second chamber which is open at a bottom thereof, said third chamber being a vertical passage which is blind at a top and open at a bottom thereof, an upper portion of said third chamber communicating with said fourth chamber which is a horizontal passage, said fourth chamber communicating with said fifth chamber which has a larger diameter than said fourth chamber, said fifth chamber being adapted to be connected to a main burner;a base plate fixedly mounted on a bottom of said lower cover;a diaphragm mounted between said base and a bottom of said lower cover;a spring arranged between said base plate and said diaphragm thereby urging said diaphragm to go upwardly to close the bottom of said second and third chambers of said lower cover;an upper cover formed with a first cavity at an end thereof, a second cavity at an intermediate portion thereof and a third cavity at another end thereof, a top of said upper cover having a first passage adapted to be connected to a pilot burner and a second passage adapted to be connected to a regulator, said first passage communicating with an upper portion of said first cavity and provided with an adjust screw for controlling flow rate of gas to said pilot burner, a first solenoid fitted in an upper portion of said first cavity, a first lever being pivotally mounted within said first cavity and having a first and second ends right under said first solenoid and said first passage respectively, a first tension spring having an upper end connected with a first end of said first lever and a lower end connected with a lower portion of said first cavity, said first cavity communicating with said first chamber via an orifice, said second passage communicating with an upper portion of said second cavity, said second passage being provided with an adjust screw at a top thereof for controlling gas flow rate, said second passage having a branch passage in communication with said fourth chamber, an upper portion of said second cavity communicating with an upper end of a vent passage, a lower end of said vent communicating with said second chamber, said second cavity communicating with a space formed between said base plate and said diaphragm, a second solenoid being fitted in an upper portion of said second cavity, a second lever being pivotally mounted within said second cavity and having a first and second ends right under an upper end of said vent and an inlet of the second passage respectively, a third solenoid being fitted in an upper portion of said second cavity and above the first end of said second lever, a second tension spring having an upper end with the first end of said first lever and a lower end with a lower portion of said second cavity, said third cavity communicating with said fourth and fifth chambers and having an upwardly extending through hole, an upper end of said upwardly extending through hole being adapted to engage with an auxiliary burner, a third solenoid fitted in an upper portion of said third cavity, a third lever pivotally mounted within said third cavity and having a first end under a lower end of said through hole and said third solenoid, a third tension spring having an upper end connected with said first end of said second lever 462 and a lower end with a lower portion of said first cavity.