Jet pump with one-way and oil drainage functions at outlet

Abstract

The invention discloses a jet pump with one-way and oil drainage functions at an outlet, and belongs to the field of aircraft fuel systems, the jet pump comprises a nozzle, a main box body, a jet pipe and a jet seat, the nozzle and the jet pipe are connected to the front side and the rear side of the main box body respectively, the jet seat is connected to the front end of the jet pipe, a suction inlet is formed in the upper side of the main box body, and an oil drainage port is formed in the lower side of the main box body. The nozzle, the injection pipe, the suction inlet and the oil outlet are all communicated with a cavity in the main box body; a turning plate is arranged on the front end face of the injection pipe and rotationally connected with the injection pipe, an injection hole is formed in the front end of the injection pipe, and the area of the turning plate is larger than that of the injection hole so as to seal the injection hole. The suction inlet is used for being communicated with an oil delivery tank, and an oil drain valve is arranged in the oil drain outlet, so that oil can be prevented from flowing back, and normal work of an engine is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft fuel systems, and in particular relates to a jet pump with a one-way outlet and oil discharge functions. Background Art

[0002] In an aircraft's fuel system, the ejector pump belongs to the fuel supply and delivery system. Its main function is to provide the required fuel to the engine. Under all normal flight conditions and working conditions of the aircraft, it continuously supplies fuel at a specified pressure and flow rate to the engine in a certain sequence, while keeping the aircraft's center of gravity within the specified range throughout the flight.

[0003] The fuel supply and delivery system primarily consists of a fuel supply subsystem and a fuel delivery subsystem. The fuel supply subsystem's primary function is to supply fuel to the engine, while the fuel delivery subsystem's primary function is to transfer fuel from the transfer tank to the supply tank according to a specific delivery sequence. The ejector pump, part of the fuel delivery subsystem, is installed in the fuel delivery tank. The return fuel from the aircraft engine serves as the ejector pump's inlet flow, ejecting fuel from the transfer tank to the supply tank.

[0004] Currently, a common ejector pump includes a main housing, a nozzle, and an ejector tube. The nozzle and ejector tube are respectively arranged on both sides of the main housing. A suction port is provided on the upper side of the main housing, which is used to connect to the oil tank. With this structure, the oil in the oil tank is sucked into the main housing through the suction port. External high-speed fluid is injected into the housing through the nozzle, driving the oil in the main housing to be ejected through the ejector tube into the oil supply tank, thereby achieving oil supply. However, when the aircraft faces various operating conditions or pitch angles, the oil will flow back to the oil tank through the ejector pump, resulting in insufficient engine oil consumption, which may lead to the risk of oil shortage and affect the normal operation of the engine. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a jet pump with a one-way outlet and oil discharge function. The technical problem to be solved by the present invention is achieved through the following technical solutions: In a first aspect, the present invention provides an ejector pump with a one-way outlet and an oil discharge function, comprising a nozzle, a main housing, an ejector pipe, and an ejector seat, wherein the nozzle and the ejector pipe are respectively connected to the front and rear sides of the main housing, the ejector seat is connected to the front end of the ejector pipe, a suction port is provided on the upper side of the main housing, and an oil discharge port is provided on the lower side of the main housing, and the nozzle, the ejector pipe, the suction port, and the oil discharge port are all connected to a chamber inside the main housing; A flap is provided on the front end surface of the ejector tube, which is rotatably connected to the ejector tube. An ejection hole is provided at the front end of the ejector tube. The area of ​​the flap is larger than that of the ejection hole to close the ejection hole. The suction port is used to communicate with the oil tank, and an oil drain valve is provided in the oil drain port.

[0006] In one embodiment of the present invention, the front end of the nozzle is a tapered section that is smaller at the front and larger at the back. The tapered section extends into the main box body. A tapered hole is provided in the tapered section. The aperture of the tapered hole at one end close to the ejector tube is smaller than the aperture of the other end. The outer conical surface of the tapered section corresponds to both the suction port and the oil discharge port.

[0007] In one embodiment of the present invention, the ejector tube includes a mixing section and a diffusion section connected in sequence, the mixing section is connected to the main box, and the diffusion section is connected to the ejector seat; A cylindrical channel with a constant aperture is provided in the mixing section, and a tapered channel is provided in the diffusion section. The tapered channel is connected to the cylindrical channel, and the aperture of one end of the tapered channel connecting with the cylindrical channel is smaller than the aperture of the other end.

[0008] In one embodiment of the present invention, an oil suction seat is provided on the upper side of the main box body, an upper mounting hole is provided on the upper surface of the main box body, the lower end of the oil suction seat is provided in the upper mounting hole, the upper end of the oil suction seat is connected to the oil delivery tank, a through hole is provided in the oil suction seat, the upper mounting hole and the suction port are coaxially arranged, and the through hole and the suction port are coaxially arranged.

[0009] In one embodiment of the present invention, an oil filter is provided at the upper end of the oil suction seat.

[0010] In one embodiment of the present invention, an oil drain seat is provided on the upper side of the main housing, a lower mounting hole is provided on the lower surface of the main housing, an upper end of the oil drain seat is mounted in the lower mounting hole, a lower end of the oil drain seat extends to the outside of the housing, and the lower mounting hole and the oil drain port are coaxially arranged; The oil drain valve is arranged in the lower mounting hole.

[0011] In one embodiment of the present invention, the oil drain valve includes a valve body, a through-hole is provided in the valve body, the through-hole and the oil drain port are coaxially arranged, an outer tube, an inner tube, a spring and a handle are provided in the through-hole, the outer tube is sleeved on the outer side of the inner tube, the spring is sleeved on the outer side of the outer tube, the handle is fixed to the outer surface of the outer tube, a spring groove is provided on the lower surface of the valve body, one end of the spring is pressed in the spring groove, and the other end is pressed against the handle; A sealing block is provided at the upper end of the outer tube. The sealing block includes a circular pressing section and an arc-shaped transition section. The diameter of the circular pressing section is larger than the diameter of the perforation. The lower end of the arc-shaped transition section is connected to the outer tube, and the upper end is connected to the circular pressing section. A flow hole is provided on the outer periphery of the upper end of the outer tube, and the flow hole is located on the lower side of the arc-shaped transition section. When the oil drain valve is in a closed state, the arc-shaped transition section presses against the inner wall of the perforation, and the flow hole is cut off from the chamber inside the main box body. When the oil drain valve is in an open state, the arc-shaped transition section moves upward and separates from the inner wall of the perforation, and the outer tube moves upward to connect the flow hole with the chamber inside the main box body.

[0012] In one embodiment of the present invention, the valve body includes an upper section and a lower section connected in sequence, the upper section is located in the through hole, the lower section is pressed against the lower surface of the oil drain seat, and an annular protrusion is provided on the outer peripheral surface of the upper section, the annular protrusion is in contact with the inner wall of the through hole, and there is a groove between the annular protrusion and the lower section.

[0013] In one embodiment of the present invention, the upper end of the flap is rotatably connected to the front end face of the ejector tube, and a torsion spring is provided at the upper end of the flap. The flap is pressed against the front end face of the ejector tube under the elastic action of the torsion spring. An outlet hole is provided in the ejector seat, and an inner wall of the outlet hole is provided with an inclined surface for matching with the flap.

[0014] In one embodiment of the present invention, it also includes an external injection pipe, one end of which is connected to the nozzle, and the other end is used to input external fluid. A centrifugal pump, a hand valve and a flow meter are provided on the external injection pipe. The flow meter is arranged close to the nozzle, and the hand valve is located between the centrifugal pump and the flow meter.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the above-mentioned solution of the present application, the ejector pump includes a nozzle, a main housing, an ejector pipe, and an ejector seat. The nozzle and ejector pipe are respectively connected to the front and rear sides of the main housing, and the ejector seat is connected to the front end of the ejector pipe. The upper side of the main housing is provided with a suction port, and the lower side of the main housing is provided with an oil drain port. The nozzle, ejector pipe, suction port, and oil drain port are all connected to the chamber inside the main housing. A flap is provided on the front end surface of the ejector pipe, which is rotatably connected to the ejector pipe. The front end of the ejector pipe is provided with an ejection hole, and the area of ​​the flap is larger than the ejection hole to close the ejection hole. The suction port is used to communicate with the oil tank, and the oil drain port is provided with an oil drain valve. With this structure, oil in the oil tank can flow into the chamber of the main housing through the suction port, and external high-speed fluid can enter the chamber of the main housing through the nozzle, driving the oil in the main housing through the ejector pipe and ejector seat to the oil supply tank, thereby realizing oil supply. Furthermore, in the present application, a flap is provided on the front end face of the ejector tube, which is rotatably connected to the ejector tube, and the area of ​​the flap is larger than the area of ​​the ejection hole. Thus, the flap can form a one-way valve. When fuel flows from the ejector tube to the ejector seat, the flap is lifted by the thrust of the fuel, opening the one-way valve and unblocking the oil circuit. Fuel can be ejected into the fuel supply tank through the ejector tube and the ejector seat, thus achieving oil supply. When fuel flows from the ejector seat to the ejector tube, the flap is pressed against the front end face of the ejector tube by the pressure of the fuel, thereby sealing the ejection hole of the ejector tube, closing the one-way valve and the oil circuit, preventing oil backflow and ensuring normal operation of the engine.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Schematic diagram of an ejector pump and an oil tank in an embodiment of the present invention; Figure 2 is a cross-sectional view of an ejector pump according to an embodiment of the present invention; Figure 3 1 is a perspective schematic diagram of an ejector pump according to an embodiment of the present invention; Figure 4 is a schematic diagram of an embodiment of the present invention in which the flap and the oil drain valve are both in an open state; Figure 5 This is a schematic diagram of an embodiment of the present invention when the flap is open and the oil drain valve is closed; Figure 6 This is a schematic diagram of an embodiment of the present invention when the flap is closed and the oil drain valve is open; Figure 7 is a schematic diagram of an embodiment of the present invention when the flap and the oil drain valve are both in a closed state; Figure 8 This is an enlarged schematic diagram of the ejector seat in the embodiment of the present invention. Figure 1 ; Figure 9 This is an enlarged schematic diagram of the ejector seat in the embodiment of the present invention. Figure 2 ; Figure 10 Schematic diagram of an oil drain valve in a closed state according to an embodiment of the present invention; Figure 11 is a schematic diagram of an oil drain valve in an open state according to an embodiment of the present invention; Figure 12 Schematic diagram of the external connection pipeline of the ejector pump in an embodiment of the present invention.

[0018] Figure markings: 1-nozzle, 2-main box body, 3-injector pipe, 31-mixing section, 32-diffuser section, 4-injector seat, 5-flap, 6-oil tank, 7-oil suction seat, 8-oil filter, 9-oil drain valve, 91-valve body, 911-upper section body, 912-lower section body, 92-outer tube, 93-inner tube, 94-spring, 95-handle, 10-inclined surface, 11-centrifugal pump, 12-hand valve, 13-flow meter. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0020] See Figures 1 to 12The embodiment of the present invention provides an ejector pump with one-way and oil discharge functions, comprising a nozzle 1, a main box body 2, an ejector pipe 3 and an ejector seat 4, the nozzle 1 and the ejector pipe 3 are respectively connected to the front and rear sides of the main box body 2, the ejector seat 4 is connected to the front end of the ejector pipe 3, the upper side of the main box body 2 is provided with a suction port, and the lower side of the main box body 2 is provided with an oil discharge port, the nozzle 1, the ejector pipe 3, the suction port and the oil discharge port are all connected to the chamber inside the main box body 2; a flap 5 is provided on the front end surface of the ejector pipe 3, the flap 5 is rotatably connected to the ejector pipe 3, an ejection hole is provided at the front end of the ejector pipe 3, the area of ​​the flap 5 is larger than the area of ​​the ejection hole, so as to close the ejection hole; the suction port is used to be connected to the oil tank 6, and an oil discharge valve 9 is provided in the oil discharge port.

[0021] In some embodiments of the present application, a jet pump is a fluid delivery device with no moving parts. It uses the kinetic energy of a high-speed fluid (typically high-pressure fuel) to create a low-pressure area, thereby sucking and delivering fuel. In aircraft fuel systems, it is primarily used for tasks such as fuel transfer, maintaining fuel levels in sumps, and balancing fuel distribution in tanks.

[0022] In some embodiments of the present application, the main box body 2 is a hexahedral structure, and the main box body 2 includes a front side panel, a rear side panel, a left side panel, a right side panel, an upper side panel and a lower side panel. A first through hole is provided on the rear side panel, and the nozzle 1 extends into the chamber of the main box body 2 through the first through hole. A second through hole is provided on the front side panel, and the ejection tube 3 extends into the chamber of the main box body 2 through the second through hole.

[0023] In some embodiments of the present application, mounting plates are provided at both ends of the ejector tube 3, the ejector seat 4 includes a base plate and an ejector tube, the mounting plate at one end of the ejector tube 3 is connected to the box body, and the mounting plate at the other end of the ejector tube 3 is connected to the base plate of the ejector seat 4.

[0024] In some embodiments of the present application, the flap 5 can form a one-way valve structure, and the front end surfaces of the flap 5 and the ejector tube 3 need to be ground to ensure the sealing of the product.

[0025] In the above scheme of the present application, the ejection pump includes a nozzle 1, a main box body 2, an ejection pipe 3 and an ejection seat 4. The nozzle 1 and the ejection pipe 3 are respectively connected to the front and rear sides of the main box body 2, and the ejection seat 4 is connected to the front end of the ejection pipe 3. The upper side of the main box body 2 is provided with a suction port, and the lower side of the main box body 2 is provided with an oil drain port. The nozzle 1, the ejection pipe 3, the suction port and the oil drain port are all connected to the chamber inside the main box body 2; a flap 5 is provided on the front end surface of the ejection pipe 3, and the flap 5 is rotatably connected to the ejection pipe 3. An ejection hole is provided at the front end of the ejection pipe 3, and the area of ​​the flap 5 is larger than the area of ​​the ejection hole to close the ejection hole; the suction port is used to communicate with the oil tank 6, and an oil drain valve 9 is provided in the oil drain port. With this structure, the oil in the oil delivery tank 6 can flow into the chamber of the main housing 2 through the suction port. External high-speed fluid can enter the chamber of the main housing 2 through the nozzle 1, driving the oil in the main housing 2 through the ejector tube 3 and the ejector seat 4 and ejecting it into the oil supply tank, thereby achieving oil supply. Furthermore, in this application, a flap 5 is provided on the front end surface of the ejector tube 3, which is rotatably connected to the ejector tube 3 and has an area larger than the ejection hole. In this way, the flap 5 can form a one-way valve. When the fuel flows from the ejector pipe 3 to the ejector seat 4, the flap 5 flips up under the thrust of the fuel, the one-way valve opens, the oil circuit is opened, and the fuel can be ejected into the fuel supply tank through the ejector pipe 3 and the ejector seat 4, thereby realizing the supply of oil; when the fuel flows from the ejector seat 4 to the ejector pipe 3, the flap 5 is pressed to the front end face of the ejector pipe 3 under the pressure of the fuel, thereby closing the ejection hole of the ejector pipe 3, so that the one-way valve is closed, the oil circuit is closed, and the oil backflow is prevented, thereby ensuring that the engine can work normally.

[0026] In addition, the above-mentioned structure of the present application can save space in the oil tank 6 and the oil pipeline, improve the utilization rate of the oil tank space, reduce the overall weight of the oil system, reduce the number of adapters in the oil pipeline, reduce the number of finished products in the oil pipeline, reduce the failure rate in the oil pipeline, and also reduce the cost of the oil system.

[0027] In some embodiments of the present application, Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the front end of the nozzle 1 is a tapered section that is smaller at the front and larger at the back. The tapered section extends into the main housing 2. A tapered hole is provided in the tapered section. The aperture of the tapered hole at one end close to the ejection tube 3 is smaller than that at the other end. The outer conical surface of the tapered section corresponds to both the suction port and the oil discharge port. With this structure, the tapered hole reduces the pressure of the high-speed fluid at the outlet, forming a stronger negative pressure zone, thereby improving the ability to extract fluid from the suction port. The tapered hole structure that is smaller at the front and larger at the back gradually expands the flow channel, reduces the flow rate, restores static pressure, and maximizes the ejection effect. At the same time, the coordination of the outer conical surface with the suction port or the oil discharge port can guide the ejected fluid to smoothly enter the mixing zone, reduce turbulence and energy loss, and improve mixing efficiency.

[0028] In some embodiments of the present application, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the ejector tube 3 includes a mixing section 31 and a diffuser section 32, which are connected in sequence. The mixing section 31 is connected to the main housing 2, and the diffuser section 32 is connected to the ejector seat 4. The mixing section 31 is provided with a cylindrical channel with a constant aperture, and the diffuser section 32 is provided with a tapered channel. The tapered channel is connected to the cylindrical channel, and the aperture of the tapered channel at one end where it connects to the cylindrical channel is smaller than the aperture of the other end. With this structure, the cylindrical channel provides a fully developed turbulent zone, allowing the high-speed working fluid and the ejected fluid to mix thoroughly at a constant cross-section, ensuring uniform momentum transfer. Moreover, compared with direct tapered diffusion, the cylindrical section can avoid eddies or backflows caused by sudden changes in cross-section, thereby improving mixing efficiency. By gradually expanding the cross-sectional area, the tapered channel converts the fluid's kinetic energy into static pressure energy, restoring the outlet pressure and improving the total pressure rise capacity of the ejector pump. In addition, the gradual expansion angle of the tapered channel can balance the diffusion efficiency and separation risk, avoiding boundary layer separation and energy loss caused by excessive diffusion. In addition, a streamlined transition is formed at the connection point between the cylindrical channel and the tapered channel, reducing local resistance loss.

[0029] In some embodiments of the present application, high-pressure fuel is ejected through the working nozzle 1 and mixed with the injected fuel in the mixing section 31. Energy is transferred to the injected fuel by the change in jet flow momentum and diffusion. After thorough mixing in the mixing section 31, the fuel enters the diffusion section 32 where it is decelerated and pressurized. The jet pump has advantages such as simple structure, light weight, reliable operation, easy processing, no moving parts, and long life.

[0030] In some embodiments of the present application, the jet pump design includes four main operating components: the nozzle 1, the suction chamber, the mixing section 31, and the diffuser 32. Based on the fuel system's performance requirements (an inlet flow rate of 350 L / h, an inlet pressure of 100 kPa, and an outlet flow rate ≥ 700 L / h), key dimensions of the jet pump, such as the outlet diameter of the nozzle 1, the length of the straight section at the nozzle 1 outlet, the distance from the nozzle to the throat, the diameter and length of the mixing section 31, and the length of the diffuser 32, are calculated.

[0031] In some embodiments of the present application, Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, an oil suction seat 7 is provided on the upper side of the main housing 2. An upper mounting hole is provided on the upper surface of the main housing 2. The lower end of the oil suction seat 7 is positioned within the upper mounting hole. The upper end of the oil suction seat 7 is connected to the oil delivery tank 6. A through hole is provided within the oil suction seat 7. The upper mounting hole and the suction port are coaxially arranged, and the through hole and the suction port are coaxially arranged. This coaxial arrangement ensures that the fluid flows in a straight line from the oil delivery tank 6 to the through hole of the oil suction seat 7 and then from the through hole of the oil suction seat 7 to the suction port, avoiding turbulence, pressure drop, and energy loss caused by bends or sudden changes in cross-section.

[0032] In some embodiments of the present application, Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, the upper end of the oil suction seat 7 is provided with an oil filter 8. Adopting this structure, the oil filter 8 can ensure that there is no foreign matter pollutant in the discharged fuel to get stuck in the ejector pump, causing the ejector pump to lose its function.

[0033] In some embodiments of the present application, Figure 2 、 Figure 4 and Figure 5 As shown, an oil drain receptacle is installed on the upper side of the main housing 2, and a lower mounting hole is provided on the lower surface of the main housing 2. The upper end of the oil drain receptacle is mounted within the lower mounting hole, while the lower end of the oil drain receptacle extends outside the housing. The lower mounting hole and the oil drain port are coaxially arranged. An oil drain valve 9 is located within the lower mounting hole. This structure aligns the oil drain port, the lower mounting hole, and the oil drain receptacle coaxially, allowing the oil to flow out in a straight line without bending or stagnation, ensuring complete oil drainage and reducing residual oil in the housing. It also reduces eddy currents and pressure loss, improving oil drainage efficiency.

[0034] In some embodiments of the present application, Figure 2 、 Figure 10 and Figure 11As shown, the oil drain valve 9 includes a valve body 91, a through hole is provided in the valve body 91, the through hole and the oil drain port are coaxially arranged, an outer tube 92, an inner tube 93, a spring 94 and a handle are provided in the through hole, the outer tube 92 is sleeved on the outside of the inner tube 93, the spring 94 is sleeved on the outside of the outer tube 92, and the handle is fixed on the outer surface of the outer tube 92, a spring 94 groove is provided on the lower surface of the valve body 91, one end of the spring 94 is pressed in the spring 94 groove, and the other end is pressed against the handle; a sealing block is provided at the upper end of the outer tube 92, and the sealing block includes a circular pressing section and an arc-shaped pressing section. The diameter of the circular pressure section is larger than the diameter of the perforation. The lower end of the arcuate transition section is connected to the outer tube 92, and the upper end is connected to the circular pressure section. The outer circumference of the upper end of the outer tube 92 is provided with a flow hole, which is located on the lower side of the arcuate transition section. When the oil discharge valve 9 is closed, the arcuate transition section presses against the inner wall of the perforation, and the flow hole is cut off from the chamber inside the main tank 2. When the oil discharge valve 9 is opened, the arcuate transition section moves upward and separates from the inner wall of the perforation, and the outer tube 92 moves upward and connects the flow hole with the chamber inside the main tank 2. With this structure, the handle can be used to control the outer tube 92 to move upward relative to the inner tube 93 and compress the spring 94, so that the upper portion of the outer tube 92 can extend into the chamber inside the main tank 2, thereby connecting the flow hole in the upper portion of the outer tube 92 with the chamber inside the main tank 2. At this time, the fuel in the fuel tank 6 can be directly discharged through the oil discharge valve 9. When the handle is released, the outer tube 92 moves downward relative to the inner tube 93 under the action of the spring 94, so that the upper part of the outer tube 92 shrinks into the through-hole of the valve body 91. At this time, the arc-shaped transition section presses against the inner wall of the through-hole, so that the chamber and flow hole inside the main oil tank are cut off, thereby ending the oil draining operation.

[0035] In some embodiments of the present application, the jet pump is installed in the oil delivery tank 6, with its suction port immersed in the oil in the oil delivery tank 6. The jet pump inlet is connected to the engine oil return line, providing motive flow for the jet pump. The jet pump outlet is connected to the oil supply tank pipeline, delivering the oil ejected by the jet pump to the oil supply tank. A one-way flap 5 is installed at the jet pump outlet to prevent oil from the oil supply tank from flowing back through the jet pump into the oil delivery tank 6 connected to the suction port.

[0036] In some embodiments of the present application, Figure 2 、 Figure 10 and Figure 11As shown, the valve body 91 includes an upper body 911 and a lower body 912 connected in sequence. The upper body 911 is located in the perforation, and the lower body 912 is pressed against the lower surface of the oil drain seat. An annular protrusion is provided on the outer peripheral surface of the upper body 911, which abuts the inner wall of the perforation. A groove is present between the annular protrusion and the lower body 912. With this structure, the annular protrusion abuts against the inner wall of the perforation to form a first sealing surface, which prevents oil from leaking along the gap between the valve body 91 and the perforation through interference fit or elastic deformation. The groove can act as an oil storage buffer. If a small amount of oil breaks through the annular protrusion, it will be temporarily stored in the groove to avoid direct leakage to the outside. The lower body 912 presses against the lower surface of the oil drain seat to provide a second sealing surface, ensuring the static sealing reliability between the valve body 91 and the oil drain seat.

[0037] In some embodiments of the present application, Figure 8 and Figure 9 As shown, the upper end of the flap 5 is rotatably connected to the front end face of the ejector tube 3. A torsion spring is provided at the upper end of the flap 5. The flap 5 is pressed against the front end face of the ejector tube 3 under the elastic action of the torsion spring. An outlet hole is provided in the ejector seat 4, and an inclined surface 10 for matching with the flap 5 is provided on the inner wall of the outlet hole. With this structure, the flap 5 is pressed against the front end face of the ejector tube 3 by default under the action of the torsion spring, forming a seal to prevent the fluid from flowing back. When the ejector pump is working, the fluid pressure overcomes the elastic force of the torsion spring to push open the flap 5, allowing forward flow and realizing the function of an automatic one-way valve. The inclined surface 10 on the inner wall of the outlet hole matches the shape of the flap 5, ensuring that when the flap 5 is opened, the fluid is guided to be discharged smoothly along the oblique direction, reducing turbulence and pressure loss, and avoiding damage to the flap 5.

[0038] In some embodiments of the present application, Figure 12 As shown, the jet pump also includes an external jet conduit, one end of which is connected to the nozzle 1 and the other end for inputting external fluid. The external jet conduit is equipped with a centrifugal pump 11, a manual valve 12, and a flowmeter 13. The flowmeter 13 is located near the nozzle 1, and the manual valve 12 is located between the centrifugal pump 11 and the flowmeter 13. With this structure, the flowmeter 13 can monitor the flow rate of the working fluid in real time, ensuring that the jet pump's injection ratio is within the optimal range and avoiding efficiency degradation caused by excessive or insufficient injection. The manual valve 12 can control the opening and closing of the conduit. The centrifugal pump 11 pressurizes the external fluid (oil) and delivers it to the nozzle 1 at high speed, forming a high-speed jet.

[0039] In some embodiments of the present application, several pressure and flow monitoring points are installed on the jet pump inlet dynamic flow line, the jet pump suction line, and the jet pump outlet line to record changes in the jet pump's performance. Performance tests of the jet pump were conducted under simulated fuel system operating conditions, and data from these monitoring points was recorded. Table 1 below shows the test data for the jet pump.

[0040] Table 1

[0041] In some embodiments of the present application, when the outlet pressure of the jet pump is 12 kPa, the flow rate meets the requirements, indicating that the one-way valve added at the outlet is fully open and functioning normally when the jet pump is operating. A reverse sealing test was conducted on the outlet of the jet pump, and the oil leakage rate met the requirements. When the jet pump is not operating, the oil in the fuel supply tank cannot flow through the jet pump into the fuel delivery tank 6, ensuring that the oil does not flow back. The performance of the jet pump with a one-way valve was tested under various fuel system operating conditions, and it can meet the performance requirements of the fuel system. The test results show that the performance of the jet pump with a one-way valve is reasonable and feasible in the fuel system, and all functions and performance indicators meet the requirements of the test outline and technical agreement, and the operation is stable and reliable. The drain valve 9 is installed at the bottom of the fuel delivery tank 6. To perform the oil drain operation, press the drain handle to open the drain valve 9 and start the oil drain operation. After the oil drain is completed, the drain handle is reset to close the drain valve 9. It should be noted that the drain valve 9 must be in the closed position when the jet pump is operating.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0044] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A jet pump with one-way outlet and oil discharge function, characterized in that: The oil pump comprises a nozzle, a main housing, an ejector pipe and an ejector seat, wherein the nozzle and the ejector pipe are respectively connected to the front and rear sides of the main housing, the ejector seat is connected to the front end of the ejector pipe, the upper side of the main housing is provided with a suction port, the lower side of the main housing is provided with an oil discharge port, and the nozzle, ejector pipe, suction port and oil discharge port are all connected to the chamber inside the main housing; A flap is provided on the front end surface of the ejector tube, the flap being rotatably connected to the ejector tube, an ejection hole is provided at the front end of the ejector tube, and the area of ​​the flap is larger than the area of ​​the ejection hole to close the ejection hole; The suction port is used to communicate with the oil tank, and an oil drain valve is provided in the oil drain port.

2. The jet pump with one-way outlet and oil discharge function according to claim 1, characterized in that: The front end of the nozzle is a tapered section that is smaller at the front and larger at the back. The tapered section extends into the main box body. A tapered hole is provided in the tapered section. The aperture of the tapered hole at one end close to the ejector tube is smaller than the aperture of the other end. The outer conical surface of the tapered section corresponds to both the suction port and the oil discharge port.

3. The jet pump with one-way outlet and oil discharge function according to claim 2, characterized in that: The ejector tube comprises a mixing section and a diffusion section connected in sequence, the mixing section is connected to the main box, and the diffusion section is connected to the ejector seat; A cylindrical channel with a constant aperture is provided in the mixing section, and a conical channel is provided in the diffusion section. The conical channel is connected to the cylindrical channel, and the aperture of one end of the conical channel connected to the cylindrical channel is smaller than the aperture of the other end.

4. The jet pump with one-way outlet and oil discharge function according to claim 1, characterized in that: An oil suction seat is provided on the upper side of the main box body, an upper mounting hole is provided on the upper surface of the main box body, the lower end of the oil suction seat is arranged in the upper mounting hole, the upper end of the oil suction seat is connected to the oil delivery tank, a through hole is provided in the oil suction seat, the upper mounting hole and the suction port are coaxially arranged, and the through hole and the suction port are coaxially arranged.

5. The jet pump with one-way outlet and oil discharge function according to claim 4, characterized in that: An oil filter is provided at the upper end of the oil suction seat.

6. The jet pump with one-way outlet and oil discharge function according to claim 1, characterized in that: An oil drain seat is provided on the upper side of the main box body, and a lower mounting hole is provided on the lower surface of the main box body. The upper end of the oil drain seat is installed in the lower mounting hole, and the lower end of the oil drain seat extends to the outside of the box body. The lower mounting hole and the oil drain port are coaxially arranged; The oil drain valve is arranged in the lower mounting hole.

7. The jet pump with one-way outlet and oil discharge function according to claim 6, characterized in that: The oil drain valve includes a valve body, a through-hole is provided in the valve body, the through-hole and the oil drain port are coaxially arranged, an outer tube, an inner tube, a spring and a handle are provided in the through-hole, the outer tube is sleeved on the outer side of the inner tube, the spring is sleeved on the outer side of the outer tube, the handle is fixed to the outer surface of the outer tube, a spring groove is provided on the lower surface of the valve body, one end of the spring presses against the spring groove, and the other end presses against the handle; A sealing block is provided at the upper end of the outer tube, the sealing block comprising a circular pressing section and an arc-shaped transition section, the diameter of the circular pressing section being larger than the diameter of the through-hole, the lower end of the arc-shaped transition section being connected to the outer tube, and the upper end of the arc-shaped transition section being connected to the circular pressing section, a flow hole is provided on the outer periphery of the upper end of the outer tube, and the flow hole is located on the lower side of the arc-shaped transition section; When the oil drain valve is in a closed state, the arc-shaped transition section presses against the inner wall of the through hole, and the flow hole is cut off from the chamber inside the main box body. When the oil drain valve is in an open state, the arc-shaped transition section moves upward and separates from the inner wall of the through hole, and the outer tube moves upward to connect the flow hole with the chamber inside the main box body.

8. The jet pump with one-way outlet and oil discharge function according to claim 7, characterized in that: The valve body includes an upper section and a lower section connected in sequence, the upper section is located in the through hole, the lower section is pressed against the lower surface of the oil drain seat, an annular protrusion is provided on the outer peripheral surface of the upper section, the annular protrusion is in contact with the inner wall of the through hole, and a groove is provided between the annular protrusion and the lower section.

9. The jet pump with one-way outlet and oil discharge function according to claim 1, characterized in that: The upper end of the flap is rotatably connected to the front end face of the ejector tube. A torsion spring is provided at the upper end of the flap. The flap is pressed against the front end face of the ejector tube under the elastic action of the torsion spring. An outlet hole is provided in the ejector seat, and an inclined surface for matching with the flap is provided on the inner wall of the outlet hole.

10. The jet pump with one-way outlet and oil discharge function according to claim 1, characterized in that: It also includes an external injection pipe, one end of which is connected to the nozzle, and the other end is used to input external fluid. A centrifugal pump, a hand valve and a flow meter are provided on the external injection pipe. The flow meter is arranged close to the nozzle, and the hand valve is located between the centrifugal pump and the flow meter.

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