Search

CN-122014897-A - Mechanical oil delivery cut-off control valve for aircraft fuel system

CN122014897ACN 122014897 ACN122014897 ACN 122014897ACN-122014897-A

Abstract

The invention discloses a mechanical oil delivery cut-off control valve for an aircraft fuel system, which belongs to the field of aircraft fuel systems and comprises a shell, a float control assembly and an oil delivery control assembly, wherein the float control assembly and the oil delivery control assembly are arranged in the shell, a valve seat is further arranged in the shell, the valve seat and the shell enclose an oil delivery cavity together, a float oil duct and a piston oil duct are arranged on the valve seat and are communicated with the oil delivery cavity, the float control assembly comprises a float valve, a float support and a float element, one side of the float support is rotationally connected with the valve seat, the other side of the float support is fixedly connected with the float element, one end of the float valve extends into the float oil duct, the other end of the float valve extends out through the float oil duct and is connected with the float support, one end of the piston extends into the piston oil duct, the other end of the piston extends out through the piston oil duct and is connected with the float support, and the piston oil duct is connected with the oil delivery pipe, so that emergency operation of the oil delivery passage can be cut off in advance.

Inventors

  • CHU BINBIN
  • Shang Xinge
  • ZHANG GANEN
  • PAN QING
  • Cai dongyang

Assignees

  • 西安沃祥航空科技有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The mechanical oil delivery cut-off control valve for the aircraft fuel system is characterized by comprising a shell, a float control assembly and an oil delivery control assembly, wherein the float control assembly and the oil delivery control assembly are arranged in the shell, a valve seat is further arranged in the shell, the valve seat and the shell jointly enclose an oil delivery cavity, a float oil duct and a piston oil duct are arranged on the valve seat, and the float oil duct and the piston oil duct are communicated with the oil delivery cavity; the float control assembly comprises a float valve, a float support and a float element, wherein one side of the float support is rotationally connected with the valve seat, the other side of the float support is fixedly connected with the float element, one end of the float valve stretches into the float oil duct, and the other end of the float valve stretches out through the float oil duct and is connected with the float support; The oil transportation control assembly comprises a piston and an oil transportation pipe, one end of the piston stretches into the piston oil duct, the other end of the piston stretches out through the piston oil duct and is connected with the float bracket, and the piston oil duct is connected with the oil transportation pipe.
  2. 2. The mechanical fuel delivery cut-off control valve for an aircraft fuel system of claim 1, wherein the fuel delivery control assembly further comprises a fuel supply tank and a controller, one end of the fuel delivery pipe being in communication with the piston gallery and the other end being in communication with the fuel supply tank, the controller being for controlling the fuel supply tank to supply fuel to the piston gallery through the fuel delivery pipe.
  3. 3. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 1, wherein the float control assembly further comprises a first plug, the first plug extends into the float oil duct and is detachably connected with the valve seat, a first limiting part used for limiting and matching with the upper surface of the valve seat is arranged at the upper end of the first plug, a first through hole is arranged in the first plug, and the float valve is inserted into the first through hole.
  4. 4. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 3, wherein a spring, a first baffle and a second baffle are arranged at the upper end of the float valve, the first baffle and the second baffle are both sleeved on the float valve, the second baffle is positioned above the first baffle, the spring is positioned between the first baffle and the second baffle, the second baffle is fixedly connected with the float valve, the first baffle is in sliding fit with the float valve, a limiting step is arranged on the float valve, and the bracket is positioned between the first baffle and the limiting step.
  5. 5. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 3, wherein an outer frame and an inner sealing head are arranged at the lower end of the float valve, the inner sealing head is fixedly connected with the float valve, the outer frame is sleeved outside the inner sealing head and is in limit fit with the inner sealing head, and the outer frame is in limit fit with the first perforation.
  6. 6. A mechanical oil delivery shut-off control valve for an aircraft fuel system as defined in claim 3 wherein a first seal is disposed between said first plug and said first bore.
  7. 7. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 1, wherein the oil delivery control assembly further comprises a second plug, the second plug stretches into the piston oil duct and is detachably connected with the valve seat, a second limiting part used for limiting and matching with the upper surface of the valve seat is arranged at the upper end of the second plug, a second through hole is formed in the second plug, the piston further comprises a piston head and a piston rod, the piston rod is inserted into the second through hole, and the piston head is in limiting and matching with the plug.
  8. 8. The mechanical oil delivery shut-off control valve for an aircraft fuel system of claim 7, wherein a second seal is disposed between the second plug and the second bore.
  9. 9. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 1, wherein the float bracket includes a top plate, a left side plate, a right side plate, and an extension plate, the left side plate and the right side plate are respectively connected to both sides of the top plate, the valve seat includes a left positioning plate and a right positioning plate, the left side plate and the left positioning plate are rotatably connected, the right side plate and the right positioning plate are rotatably connected, one end of the extension plate is connected to the top plate, and the other end is connected to the float member.
  10. 10. The mechanical oil delivery cut-off control valve for an aircraft fuel system according to claim 1, wherein a first joint is connected to a lower end of the float oil passage, and a second joint is connected to a lower end of the piston oil passage.

Description

Mechanical oil delivery cut-off control valve for aircraft fuel system Technical Field The invention belongs to the technical field of aircraft fuel systems, and particularly relates to a mechanical oil transportation cut-off control valve for an aircraft fuel system. Background In aircraft fuel systems, pressure fueling subsystems are a critical component for achieving rapid, efficient fueling operations. In the oil delivery process, when the liquid level of the fuel in the fuel tank reaches a preset height, the oil delivery valve needs to be cut off in time so as to prevent the fuel from overflowing or prevent the system from being over-pressurized. Currently, oil cut-off control is mainly dependent on float-type mechanical control. The existing float type mechanical cut-off valve utilizes the rising of the fuel liquid level to drive the floats to float, and drives the float valve to close through the mechanical linkage mechanism, so as to cut off the oil transmission passage. The mode has simple structure and high reliability, and is widely applied to various aircraft fuel systems. However, the cutting action is completely dependent on the liquid level, and once the float mechanism fails due to mechanical jamming, abrasion or other reasons, the oil delivery valve cannot be closed timely, so that fuel oil can overflow, and potential safety hazards exist. Moreover, the conventional shut-off valve cannot realize emergency operation of shutting off the oil delivery passage in advance. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a mechanical oil delivery cut-off control valve for an aircraft fuel system. The technical problems to be solved by the invention are realized by the following technical scheme: The invention provides a mechanical oil delivery cut-off control valve for an aircraft fuel system, which comprises a shell, a float control assembly and an oil delivery control assembly, wherein the float control assembly and the oil delivery control assembly are arranged in the shell; The float control assembly comprises a float valve, a float support and a float element, one side of the float support is rotationally connected with the valve seat, the other side of the float support is fixedly connected with the float element, one end of the float valve stretches into the float oil duct, and the other end of the float valve stretches out through the float oil duct and is connected with the float support; the oil transportation control assembly comprises a piston and an oil transportation pipe, one end of the piston stretches into the piston oil duct, the other end of the piston stretches out through the piston oil duct and is connected with the float bracket, and the piston oil duct is connected with the oil transportation pipe. In one embodiment of the invention, the oil delivery control assembly further comprises an oil supply tank and a controller, wherein one end of the oil delivery pipe is communicated with the piston oil duct, the other end of the oil delivery pipe is communicated with the oil supply tank, and the controller is used for controlling the oil supply tank to supply oil to the piston oil duct through the oil delivery pipe. In one embodiment of the invention, the float control assembly further comprises a first plug which extends into the float oil duct and is detachably connected with the valve seat, a first limiting part which is used for limiting and matching with the upper surface of the valve seat is arranged at the upper end of the first plug, a first perforation is arranged in the first plug, and the float valve is inserted into the first perforation. In one embodiment of the invention, the upper end of the float valve is provided with a spring, a first baffle plate and a second baffle plate, the first baffle plate and the second baffle plate are sleeved on the float valve, the second baffle plate is positioned above the first baffle plate, the spring is positioned between the first baffle plate and the second baffle plate, the second baffle plate is fixedly connected with the float valve, the first baffle plate is in sliding fit with the float valve, the float valve is provided with a limiting step, and the bracket is positioned between the first baffle plate and the limiting step. In one embodiment of the invention, the lower end of the float valve is provided with an outer frame and an inner sealing head, the inner sealing head is fixedly connected with the float valve, the outer frame is sleeved outside the inner sealing head and is in limit fit with the inner sealing head, and the outer frame is in limit fit with the first perforation. In one embodiment of the invention, a first sealing ring is arranged between the first plug and the first through hole. In one embodiment of the invention, the oil transportation control assembly further comprises a second plug, the second plug stretches into the piston oil duct and is detachably