Hydraulic control cut-off valve
A cut-off valve and hydraulic control technology, which is applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve the problem that the cut-off valve cannot cut off the fuel, so as to facilitate production costs, reduce spring design requirements, and meet high-pressure sealing Effects on performance and seal reliability
Pending Publication Date: 2019-02-15
CHONGQING HONGJIANG MACHINERY
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Problems solved by technology
[0003] The purpose of the present invention is to provide a hydraulically controlled cut-off valve to solve the problem that the cut-off valve in the prior art cannot be used for fuel cut-off in high-pressure fuel systems
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[0040] refer to Figure 1 to Figure 6 , the present invention provides a hydraulically controlled cut-off valve, comprising: a valve body 1, which is provided with a first cavity 11, a volume cavity 12, and a second cavity 13 which are connected in sequence, and connected with the volume The oil return channel 14 communicated with the cavity 12; the valve core 2, which is slidably installed in the first cavity 11, and a shaft for high-pressure fuel to pass is formed between the valve core 2 and the first cavity 11 To the channel 21; the piston 3, which is slidably installed in the second cavity 13; the screw plug 4, which is fixed in the first cavity 11, and the screw plug 4 is provided with a shaft communicating with the shaft The oil inlet passage 41 to the passage 21; the elastic structure 5, which is installed between the plug 4 and the valve core 2; by inputting control oil of different oil pressures into the second cavity 13, the The piston 3 slides relative to the spoo...
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The invention relates to a hydraulic control cut-off valve. The problem that a cut-off valve in the prior art cannot be used for fuel oil cut-off of a high pressure fuel oil system. The hydraulic control cut-off valve comprises a valve body, a valve element, a piston, a screw plug and an elastic structure. A first cavity, a containing cavity and a second cavity which communicate in sequence and anoil return way are arranged on the valve body. An axial channel is formed between the valve element and the first cavity, an oil inlet way communicating with the axial channel is arranged in the screw plug, and the piston slides relative to the valve element since control oil is input into the second cavity. When the piston slides to the position making contact with the valve element, the valve element moves in the forward direction under the push of the piston so as to form a first gap with an outlet of the first cavity, high-pressure fuel oil flows into the containing cavity through the oilinlet way, the axial channel and the first gap in sequence, and then is drained outwards through the oil return way, and the elastic structure is compressed. When the piston slides to the position separated from the valve element, the elastic structure rebounds, the valve element seals the outlet of the first cavity, and further flow of high-pressure fuel oil is cut off.
Description
technical field [0001] The invention relates to the technical field of diesel engines, in particular to a hydraulic control cut-off valve. Background technique [0002] The cut-off valve is a safety protection device in the diesel fuel system. In the event of an emergency of the diesel engine or the pressure of the fuel system is out of control, it is necessary to quickly unload the high-pressure fuel in the fuel system through the shut-off valve to protect the safety of the system. It is widely used in the fuel system of diesel engines. The working pressure of the cut-off valve of a general diesel engine is not high, and the pressure is about 100MPa, but the pressure of the fuel system of the diesel engine has become a trend. Existing shut-off valves generally use spring force for compression and sealing. In order to meet the ever-increasing sealing pressure, greater spring compression force and higher sealing surface processing requirements are required, which brings diff...
Claims
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IPC IPC(8): F15B13/02
CPCF15B13/021
Inventor刘惠娥涂天华
OwnerCHONGQING HONGJIANG MACHINERY