The invention relates to a motive flow valve (30) for aircraft engine comprising: a shaft (31) comprising a high-pressure chamber (36), a low-pressure chamber (33), a fuel inlet (42), a fuel outlet (44), and a shoulder (45) arranged between the fuel inlet and the fuel outlet, defining an abutment su
The invention relates to a motive flow valve (30) for aircraft engine comprising: a shaft (31) comprising a high-pressure chamber (36), a low-pressure chamber (33), a fuel inlet (42), a fuel outlet (44), and a shoulder (45) arranged between the fuel inlet and the fuel outlet, defining an abutment surface (46),a drawer (55) configured to be displaced relatively to the shaft under the effect of a difference in pressure between the high- and low-pressure chambers, between a closed position wherein the drawer abuts with the abutment surface in the closed position and obstructs the fuel inlet, and an open position wherein the drawer releases the fuel inlet,with the drawer comprising a portion extending into an intermediate chamber (39), the drawer further comprising a channel (62) exiting on the one hand in a first portion (63) of the intermediate chamber and communicating with the fuel outlet in the open and closed positions, and on the other hand in a second portion (64) of the intermediate chamber that does not communicate with the fuel inlet or with the fuel outlet in the open and closed positions, anda sealing element (59) interposed between the abutment surface and the drawer in the closed position.
대표청구항▼
1. A motive flow valve for a fuel circuit of an aircraft engine, comprising: a shaft comprising a low-pressure chamber, a high-pressure chamber, a fuel inlet and a fuel outlet,a drawer extending inside the shaft between the high-pressure chamber and the low-pressure chamber, the drawer being configu
1. A motive flow valve for a fuel circuit of an aircraft engine, comprising: a shaft comprising a low-pressure chamber, a high-pressure chamber, a fuel inlet and a fuel outlet,a drawer extending inside the shaft between the high-pressure chamber and the low-pressure chamber, the drawer being configured to be displaced with respect to the shaft under the effect of a difference in pressure between the high-pressure chamber and the low-pressure chamber, between a closed position wherein the drawer obstructs the fuel inlet, and an open position wherein the drawer releases the fuel inlet in such a way as to allow for a flow of fuel from the fuel inlet to the fuel outlet,wherein the shaft comprises a shoulder arranged between the fuel inlet and the fuel outlet, defining an abutment surface with which the drawer abuts in the closed position, and a first sealing element interposed between the abutment surface and the drawer in the closed position, in such a way as to limit a fuel leak between the fuel inlet and the fuel outlet in the closed position, wherein the drawer comprises a portion extending in an intermediate chamber located between the high-pressure chamber and the low-pressure chamber, the drawer further comprising a channel exiting on the one hand in a first part of the intermediate chamber located on a first side of the portion of the drawer and communicating with the fuel outlet in the open and closed positions, and on the other hand in a second part of the intermediate chamber located on a second side of the portion of the drawer, opposite the first side, that only communicates with the fuel inlet or with the fuel outlet via the channel in the open and closed positions, in such a way as to balance a pressure of the fuel of each side of the portion of the drawer in the intermediate chamber. 2. The motive flow valve according to claim 1, wherein the first sealing element is arranged in a groove arranged on the abutment surface of the shaft, and arranged in such a way as to be in contact with the drawer in the closed position. 3. The motive flow valve according to claim 1, wherein the shaft comprises: a first tubular part wherein is arranged the fuel inlet, with the first part having at one of its ends a first inner diameter,a second tubular part wherein is arranged the fuel outlet, with the second part having at one of its ends a second inner diameter less than the first inner diameter, with the first and second parts being assembled together in such a way that the ends of the first and second parts are positioned in contact with each other by forming the shoulder. 4. The motive flow valve according to claim 3, wherein the first sealing element is arranged on the abutment surface in such a way as to be, in the closed position, on the one hand in contact with an end surface of the first part, and on the other hand in contact with the drawer. 5. The motive flow valve according to claim 1, comprising a second sealing element arranged between the fuel inlet and the second part of the intermediate chamber, in such a way as to limit a fuel leak between the fuel inlet and the fuel outlet via the second part of the intermediate chamber in the closed position. 6. The motive flow valve according to claim 1, comprising a third sealing element arranged between the high-pressure chamber and the intermediate chamber, in such a way as to limit a fuel leak between the high-pressure chamber and the intermediate chamber. 7. The motive flow valve according to claim 1, comprising a fourth sealing element arranged between the low-pressure chamber and the intermediate chamber, in such a way as to limit a fuel leak between the low-pressure chamber and the intermediate chamber. 8. A fuel circuit of an aircraft engine comprising: a fuel tank;an engine fuel system comprising: a low-pressure pump connected to the fuel tank, with the low-pressure pump to increase a pressure of a flow of low-pressure fuel coming from the fuel tank with a variable pressure differential, anda high-pressure pump connected to the low-pressure pump to provide a high-pressure fuel flow;a fuel return line connected to the engine fuel system, said line to convey a high-pressure flow to the fuel tank; andthe motive flow valve according to claim 1, of which the low-pressure chamber and the high-pressure chamber are respectively connected to the flow of low-pressure fuel upstream and downstream of the low-pressure pump, the fuel inlet communicating with the fuel return line downstream of the engine fuel system, the fuel outlet communicating with the fuel return line upstream of the fuel tank. 9. An aircraft comprising an engine supplied with fuel by the fuel circuit according to claim 8.
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이 특허에 인용된 특허 (2)
Dyer Gerald P., Combined pressure regulating and fuel flow system.
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