IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0045217
(2011-03-10)
|
등록번호 |
US-8479759
(2013-07-09)
|
우선권정보 |
IT-PD2010A0089 (2010-03-22) |
발명자
/ 주소 |
- Benvenuto, Michele
- Pappalardo, Salvatore
- Turrin, Gianpiero
|
출원인 / 주소 |
- Sit La Precisa S.p.A. Con Socio Unico
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
18 |
초록
▼
A device for controlling a combustible gas supply to a burner is provided, which includes first and second servovalves, having respective valve seats associated with a corresponding shut-off mechanism, which include respective first and second control solenoid valves with an electromagnetic operatin
A device for controlling a combustible gas supply to a burner is provided, which includes first and second servovalves, having respective valve seats associated with a corresponding shut-off mechanism, which include respective first and second control solenoid valves with an electromagnetic operating device that controls the opening/closing of the corresponding servovalve. The solenoid valves act to indirectly control the corresponding servovalve's respective shut-off mechanism. The pipes of the control are in communication with the main pipe through an auxiliary bleed pipe. A pilot pipe is branched from the auxiliary pipe to supply a pilot burner, and a thermoelectric magnetic unit with a knob is provided on the auxiliary pipe, which allows gas to flow towards the pilot burner when the unit is activated, while simultaneously shutting off the flow of gas towards the servovalve control circuit. The device includes a control mechanism, controlled by the knob, which controls gas flow.
대표청구항
▼
1. A device for controlling the supply of a combustible gas to a burner apparatus, comprising a main gas supply pipe in which are disposed a first and a second servovalve, respectively in cascade with each other, with respect to the direction of flow of the gas, said servovalves including respective
1. A device for controlling the supply of a combustible gas to a burner apparatus, comprising a main gas supply pipe in which are disposed a first and a second servovalve, respectively in cascade with each other, with respect to the direction of flow of the gas, said servovalves including respective valve seats associated with a corresponding shut-off member with diaphragm control for the opening of said seats in opposition to respective resilient return member, said first and second servovalve comprising a respective first and second control solenoid valve with an electromagnetic operating device that controls the opening/closure of the corresponding servovalve, said solenoid valves being arranged to act for opening/closure of pipes of respective servo-assisted control circuits, so as to control indirectly, by way of the diaphragm control, the respective shut-off member of the corresponding servovalve, the pipes of the control circuit placing the main pipe in fluid communication with respective control chambers of the servovalves, one side of the diaphragms of said diaphragm controls being subjected to the pressure existing in the respective control chamber, both of the intake pipes of the respective control circuits, capable of picking up the pressure signal to be transmitted to the corresponding control chamber, being respectively connected, in fluid communication, with the main pipe, upstream of the first servovalve, through an auxiliary bleed pipe which is branched from the main pipe, a pilot pipe is branched from the auxiliary pipe to supply a pilot burner, and a thermoelectric magnetic safety unit with a manual activating knob is provided on said auxiliary pipe, said unit acting on the pilot pipe so as to allow gas to flow towards the pilot burner when the unit is activated, while simultaneously shutting off the flow of gas towards the servovalve control circuit, and;a control mechanism that controls the flow of gas to the control circuit, the control mechanism being controlled by the knob of said magnetic unit in operation, in order to open selectively the flow of gas towards the pipes of the servovalve control circuit, after the magnetic unit has been activated and when a flame is present at the pilot burner. 2. A device according to claim 1, wherein said control mechanism comprises a valve for shutting off the intake pipe in the control circuit upstream of said solenoid valves, the shut-off member of said valve being capable of being operated to open the respective valve seat, in opposition to a resilient return member, by contact with a projection which is fixed to said knob with respect to rotation and which interferes with said shut-off member in a predetermined angular position of the knob. 3. A device according to claim 2, wherein the auxiliary pipe comprises, from the section communicating with the main pipe onwards, a first portion of pipe extending into a second portion through an interposed valve seat, on which said manually activated thermoelectric magnetic safety unit acts, said second portion branching, downstream of said interposed valve seat, into a pilot pipe, through a second interposed valve seat, and into the control circuit intake pipe, through a third interposed valve. 4. A device according to claim 1, wherein said control mechanism comprises a switch which acts on the electrical supply circuit of the solenoid valves and which can be switched selectively for the opening/closure of said circuit by a projection from said knob or a shaped portion of the knob which can interfere with the switching element of said switch in order to operate it in a predetermined angular position of the knob. 5. A device according to claim 4, wherein the auxiliary pipe comprises, from the section communicating with the main pipe onwards, a first portion of pipe extending into a second portion through an interposed valve seat, on which said manually activated thermoelectric magnetic safety unit acts, said second portion branching, downstream of said seat, into a pilot pipe through a further interposed valve seat, and into the control circuit intake pipe, said switch being capable of selectively opening the flow of gas by energizing said solenoid valves, thus opening the respective valve seats, when said magnetic unit has been activated, and when a flame is correspondingly present at the pilot burner, so as to allow the opening of the main gas passage towards the main burner. 6. A device according to claim 1, wherein said magnetic safety unit can also be activated electrically, for operation in an intermittent pilot mode.
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