CN116006331A - Inlet valve opening and closing control structure of centrifugal booster fuel pump - Google Patents

Abstract

The invention discloses an opening and closing control structure for an inlet valve of a centrifugal afterburner fuel pump, which comprises a fairing, a piston assembly is installed in a cup assembly, and the cavity surrounded by the fairing and the cup assembly is divided into an adjustment chamber Ⅵ and control chamber Ⅴ, the regulating chamber Ⅵ and the control chamber Ⅴ can communicate with the control oil Ⅱ through the oil circuit respectively, and the regulating chamber Ⅵ can communicate with the imported fuel oil Ⅰ; the solenoid valve controls the control chamber Ⅴ to communicate with the system return oil Ⅲ according to the control signal status or disconnected status. The structural control margin can be adjusted, the work is reliable and the application range is wider, and its technical level has reached the domestic leading level. This control structure will be rapidly popularized and applied on my country's new generation of aero-engines, effectively enhancing the combat effectiveness of our army and the country's comprehensive national strength.

Description

A Centrifugal Afterburner Fuel Pump Inlet Valve Opening and Closing Control Structure

technical field

The invention belongs to the technical field of aero-engine fuel control, and in particular relates to an opening and closing control structure of an inlet valve of a centrifugal afterburner fuel pump.

Background technique

The inlet valve opening and closing device of the afterburner fuel pump of a certain type of aero-engine fuel control system, its control structure is to realize the opening and closing of the inlet valve by balancing the oil pressure of the control chamber, the inlet oil pressure and the spring force. The control margin of this control structure is not adjustable, the opening control margin is large, while the closing control margin is very small. Due to the simplification and improvement of the fuel control system, the oil return of the system is adjusted from before the low-pressure centrifugal pump to after the low-pressure centrifugal pump, the closing control margin is significantly reduced or even basically eliminated, which may cause the inlet valve to fail to close normally.

Figure 1 shows the working principle diagram of the original control structure, which is mainly composed of inlet pipe joint 1, fairing cover 2, nut 3, piston assembly, spring 5, cup assembly, inlet valve 8, housing 10, electromagnetic Valve 12, throttle nozzle I13 and other components. The inlet pipe joint 1 is bonded and fixed to the end surface of the housing 10, forming an installation space inside; the fairing 2 is fixed between the inlet pipe joint 1 and the housing 10; the cup assembly is composed of a cup 7 and a valve rod 11, and the valve The rod 11 passes through the smaller inner hole of the cup 7 . The matching diameter of the valve rod 11 and the inner hole of the cup-shaped piece 7 with a smaller diameter is D1, and the diameter of the inner hole with a larger diameter is D2. The cup-shaped piece 7 is fixed on the housing 10. The piston assembly is composed of a piston frame 4 and a leather cup 6. The piston assembly is installed in the cup 7 and fixed on the left end of the valve rod 11 by a nut 3. The leather cup 6 is installed on the right end of the piston frame to ensure that the cup is compatible with the piston frame and the piston. Sealing is maintained between the assembly and the inner hole of the cup 7, the right end of the piston assembly and the cup assembly form a control chamber V, and the control chamber V communicates with the control oil II through the hole A1 on the cup and the throttle nozzle I13. The left end of the piston assembly and the fairing 2 form a cavity VI, and the cavity VI directly communicates with the imported fuel oil I through the hole A2 on the fairing. The spring 5 is installed between the fairing 2 and the piston frame 4, the inlet valve 8 is fixed on the right end of the valve rod 11 through the nut 9, and the right end of the casing is the impeller chamber IV. The diameter of the seal between the casing 10 and the inlet valve is D3. The solenoid valve 12 controls the oil nozzle between the throttle nozzle I13 and the type hole A1 to communicate with or disconnect the oil return III of the system according to the control signal.

The working principle of this control structure is as follows: the pressure of the cavity VI is always the same as that of the imported fuel oil I, the left end of the piston assembly always bears the elastic force of the spring 5 and the hydraulic pressure of the imported fuel oil I, and the left end of the inlet valve 8 always bears the hydraulic pressure of the imported fuel oil I . When the afterburner fuel pump is not required to supply fuel, the solenoid valve 12 is switched to the open state, and the oil circuit between the throttle nozzle I13 and the type hole A1 is communicated with the system return oil III, and the control oil II is throttled through the throttle nozzle I13 The rear pressure is similar to the oil return III of the system, and the control chamber communicates with the oil return III of the system through the hole A1, the elastic force of the spring 5 on the piston frame 4, the hydraulic pressure of the piston assembly and the imported fuel oil I at the left end of the inlet valve 8 overcomes the pressure in the control chamber V The leftward hydraulic pressure of the fuel on the piston assembly and the hydraulic pressure of the inlet fuel I at the right end of the inlet valve move the piston assembly, valve rod 11 and inlet valve 8 to the right, so that the control chamber V discharges oil to the system return oil III until the inlet The right end of the valve 8 is against the housing 10, the inlet valve is in the closed state as shown in Figure 1, the passage from the inlet fuel oil I to the impeller chamber IV is cut off, the afterburner fuel pump does not supply fuel, and there is basically no pressure in the impeller chamber IV at this time; When the afterburner fuel pump is required to supply fuel, the solenoid valve 12 is switched to the closed position, cutting off the communication between the oil circuit between the throttle nozzle I13 and the hole A1 and the oil return III of the system, and the control oil II passes through the throttle nozzle I13 and the hole A1 successively A1 enters the control chamber V to increase the pressure in the control chamber V, the hydraulic pressure of the control chamber V at the right end of the piston assembly overcomes the elastic force of the spring 5, the hydraulic pressure of the imported fuel oil I at the left end of the piston assembly and the left end of the inlet valve 8, and the piston assembly , the valve rod 11 and the inlet valve 8 move to the left, and the control oil II injects fuel into the control chamber V until the left end of the inlet valve 8 touches the right end of the cup-shaped piece 7, opening the passage from the inlet fuel I to the impeller chamber IV, and adding force The fuel pump starts to supply fuel;

Analysis of its working principle shows that the opening and closing process of the inlet valve 8 is realized by the thrust of the balance spring force and oil pressure on the piston assembly and the inlet valve 8 . When the inlet valve 8 is in the closed state and needs to be opened, the resultant force of the spring force, the piston assembly and the rightward hydraulic pressure on the inlet valve 8 is smaller than the leftward hydraulic force borne by the piston assembly; and when the inlet valve 8 is in the open state and needs to be closed , The resultant force of the spring force, the rightward hydraulic pressure on the piston assembly and the inlet valve 8 is greater than the leftward hydraulic pressure on the piston assembly and the leftward hydraulic pressure on the inlet valve 8. Since the spring force in this control structure is obviously smaller than the hydraulic pressure, when the inlet valve 8 is closed and needs to be opened, the pressure of the control oil II is obviously greater than the pressure of the inlet fuel oil I, which is also obviously higher than the pressure of the control chamber V required to open the inlet valve. , that is, the opening control margin of the inlet valve is large; and when the inlet valve 8 is open and needs to be closed, the inlet fuel oil I is only slightly higher than the pressure of the system return oil III (the difference is the boost pressure of the low-pressure centrifugal pump), and the inlet oil When the valve is closed, the pressure in the control chamber V is only slightly higher than the pressure of the system oil return III, that is, the closing control margin of the inlet valve is basically only the boosting of the low-pressure centrifugal pump, and the closing control margin is small. If the oil return III of the system is changed from the front of the low-pressure centrifugal pump to the back of the low-pressure centrifugal pump, the closing control margin of the control structure will be basically eliminated, and the inlet valve 8 will not be able to close normally after it is opened.

Contents of the invention

Purpose of the invention: In order to solve the above problems, the present invention provides a centrifugal afterburner fuel pump inlet valve opening and closing control structure, so that the opening and closing control margin of the inlet valve can be adjusted, so as to make the two more balanced and expand the inlet valve The scope of application of the opening and closing control structure improves the reliability of the control function, and avoids the situation that the opening and closing control structure of the inlet valve is working abnormally due to the small control margin in the new working environment.

Technical scheme of the present invention:

A centrifugal afterburner fuel pump inlet valve opening and closing control structure, including a fairing, the piston assembly is installed in the cup assembly, and the cavity surrounded by the fairing and the cup assembly is divided into an adjustment chamber VI and a control chamber Ⅴ, the regulating chamber Ⅵ and the control chamber Ⅴ can communicate with the control oil Ⅱ through the oil circuit respectively, and the regulating chamber Ⅵ can communicate with the imported fuel oil Ⅰ; the solenoid valve controls the control chamber Ⅴ to communicate with the system return oil Ⅲ according to the control signal or to disconnect state.

Preferably, the cup assembly is made up of a cup and a valve rod, the piston assembly is made up of a piston skeleton and a leather cup, the valve rod passes through the smaller inner hole of the cup, and the piston skeleton is fixed on the valve rod to connect the cup and the cup. The cavity surrounded by the fairing is divided into an adjustment cavity VI and a control cavity V, and the leather cup is arranged on the piston frame to seal between the piston frame and the cup.

Preferably, it also includes an inlet pipe joint and a housing, the inlet pipe joint fits and is fixed on the end face of the housing, the piston assembly and the cup assembly are installed in the installation space formed by the inlet pipe joint and the housing; the fairing is fixed on the inlet between the fitting and the housing.

Preferably, a spring is arranged between the fairing and the piston frame.

Preferably, the adjustment chamber VI communicates with the control oil II through the hole A3 on the cup and the oil passage on the housing, and the oil passage is provided with a throttle nozzle II.

Preferably, the control chamber V communicates with the control oil II through the hole A1 on the cup and the oil passage on the housing, and the oil passage is provided with a throttle nozzle I.

Preferably, the fairing is provided with a throttle nozzle III, and the regulating chamber VI communicates with the imported fuel oil I through the throttle nozzle III.

Preferably, an inlet valve is fixed at the end of the valve rod away from the adjustment chamber VI, and the inlet valve is attached to the housing.

The main advantages of the invention are: the control margin of the structure can be adjusted, the work is reliable and the application range is wider, and its technical level reaches the domestic leading level. This control structure will be rapidly popularized and applied on my country's new generation of aero-engines, effectively enhancing the combat effectiveness of our army and the country's comprehensive national strength.

Description of drawings

Figure 1 is a schematic diagram of the opening and closing control structure of the inlet valve of the afterburner fuel pump in the existing fuel control system of a certain type of aeroengine.

Fig. 2 is a schematic diagram of an opening and closing control structure of an inlet valve of a centrifugal afterburner fuel pump according to the present invention.

Fig. 3 is a time-varying curve of the pressure of the control oil II during the simulation of the opening and closing control structure of the inlet valve of the present invention.

Fig. 4 is the switching situation of the electromagnetic valve during the simulation of the opening and closing control structure of the inlet valve of the present invention, 0 means closed, and 1 means open.

Fig. 5 is the displacement response curve of the inlet valve during the simulation of the control structure of the original inlet valve, 0 means fully closed state, -8mm means fully open state;

Fig. 6 is the displacement response curve of the inlet valve during the simulation of the opening and closing control structure of the inlet valve of the present invention, where 0 indicates a fully closed state, and -8mm indicates a fully opened state.

In the figure: 1—inlet pipe joint, 2—cowl, 3—nut, 4—piston skeleton; 5—spring, 6—skin cup, 7—cup, 8—inlet valve, 9—nut, 10—shell Body, 11—valve rod, 12—solenoid valve, 13—throttle nozzle I, 14—throttle nozzle II, 15—throttle nozzle III, D1—diameter of valve rod, D2—diameter of piston assembly, D3—inlet valve and The diameter of the sealing part of the shell, L—inlet valve stroke, A1—hole I, A2—hole II, A3—hole III, I—inlet fuel oil, II—control oil, III—system oil return; IV—impeller cavity; V - control cavity, VI - regulation cavity.

Detailed ways

Taking the opening and closing control structure of the inlet valve of a certain type of centrifugal afterburning fuel pump as an example, the present invention will be described in detail below:

Figure 2 shows the working principle diagram of the improved control structure, the control structure is mainly composed of inlet pipe joint 1, fairing 2, nut 3, piston assembly, spring 5, cup assembly, inlet valve 8, housing 10 , Solenoid valve 12, throttle nozzle I13, throttle nozzle II14, throttle nozzle III15 and so on.

The inlet pipe joint 1 is bonded and fixed to the end surface of the housing 10, forming an installation space inside; the fairing 2 is fixed between the inlet pipe joint 1 and the housing 10, and the left end of the fairing 2 is equipped with a throttle nozzle III15; the cup assembly is composed of The cup-shaped part 7 and the valve rod 11 are formed, and the valve rod 11 passes through the smaller inner hole of the cup-shaped part 7 . The matching diameter of the valve rod 11 and the inner hole of the cup-shaped piece 7 with a smaller diameter is D1, and the diameter of the inner hole with a larger diameter is D2. The cup-shaped piece 7 is fixed on the housing 10. The piston assembly is composed of a piston frame 4 and a leather cup 6. The piston assembly is installed in the cup 7 and fixed on the left end of the valve rod 11 by a nut 3. The leather cup 6 is set on the right end of the piston frame to ensure that the piston frame 4 and the leather cup 6 Sealing is maintained between the cup 6 and the cup 7, the right end of the piston assembly and the cup assembly form a control chamber Ⅴ, and the control chamber Ⅴ communicates with the control oil Ⅱ through the hole A1 on the cup 7 and the throttle nozzle Ⅰ13 . The left end of the piston assembly and the fairing 2 form an adjustment chamber VI, and the adjustment chamber VI communicates with the imported fuel oil I through the throttle nozzle III15 on the fairing 2, and communicates with the control oil II through the hole A3 on the cup-shaped part 7 and the throttle nozzle II14. communicate. The spring 5 is installed between the fairing 2 and the piston frame 4, the inlet valve 8 is fixed on the right end of the valve rod 11 through the nut 9, and the right end of the casing 10 is the impeller cavity IV. The diameter of the seal between the casing 10 and the inlet valve 8 is D3. The solenoid valve 12 controls the oil path between the throttle nozzle I13 and the type hole A1 to communicate with or disconnect the oil return III of the system according to the control signal.

The working principle of the control structure of the present invention is as follows: the control oil II communicates with the regulating chamber VI through the throttle nozzle II14 and the hole A3 on the cup 7, and the regulating chamber VI communicates with the imported fuel oil I through the throttle nozzle III15. Adjust the pressure in the adjustment chamber VI by adjusting the diameter of the throttle nozzle II14 and the throttle nozzle III15 to obtain a suitable pressure slightly higher than the pressure of the imported fuel oil I; the left end of the piston assembly is always under the elastic force of the spring 5 and the pressure of the adjustment chamber VI Hydraulic pressure, the left end of the inlet valve 8 bears the hydraulic pressure of the imported fuel oil I all the time. When the afterburner fuel pump is not required to supply fuel, the solenoid valve 12 is switched to the open state, and the oil circuit between the throttle nozzle I13 and the type hole A1 is communicated with the system return oil III, and the control oil II is throttled through the throttle nozzle I13 The rear pressure is similar to the oil return III of the system, and the control chamber V communicates with the oil return III of the system through the hole A1, the elastic force of the spring 5 on the piston frame 4, the piston assembly and the hydraulic pressure of the imported fuel oil I at the left end of the inlet valve 8 overcome the control chamber V The leftward hydraulic pressure of the middle fuel oil on the piston assembly and the hydraulic pressure of the imported fuel oil I at the right end of the inlet valve 8 move the piston assembly, valve rod 11 and inlet valve 8 to the right, so that the control chamber V discharges oil to the system return oil III, Until the right end of the inlet valve 8 abuts against the housing 10, the inlet valve 8 is in the closed state shown in Figure 2, cutting off the passage of the inlet fuel oil I to the impeller chamber IV, and the afterburner fuel pump does not supply fuel, and at this time there is basically no fuel in the impeller chamber IV. pressure; when the afterburner fuel pump is required to supply fuel, the solenoid valve 12 switches to the closed position, cuts off the communication between the oil circuit between the throttle nozzle I13 and the type hole A1 and the system oil return III, and the control oil II passes through the throttle nozzle successively 13 and hole A1 enter the control chamber V, so that the pressure in the control chamber V increases, the hydraulic pressure of the control chamber V at the right end of the piston assembly overcomes the elastic force of the spring 5, the hydraulic pressure of the adjustment chamber VI at the left end of the piston assembly and the left end of the inlet valve 8 The hydraulic pressure of the imported fuel oil I makes the piston assembly, the valve rod 11 and the inlet valve 8 move to the left until the left end of the inlet valve 8 abuts against the right end of the cup-shaped piece 7, opening the passage from the imported fuel oil I to the impeller chamber IV, and adding The power fuel pump starts to supply fuel;

The analysis of the working principle of the improved inlet valve opening and closing control structure shows that the opening and closing process of the inlet valve 8 is mainly controlled by the oil pressure, and the cavity Ⅵ that originally directly communicated with the inlet fuel oil Ⅰ is used as the regulating chamber, and through the throttle nozzle Ⅱ14 and throttle nozzle Ⅲ15 adjust the middle pressure, so that the middle pressure is higher than the pressure of inlet fuel oil Ⅰ, thereby increasing the hydraulic pressure on the left end of the piston assembly. When the inlet valve is opened, the reverse hydraulic pressure on the left end of the piston assembly increases. As a result, the pressure of the control chamber V that opens the inlet valve 8 increases, and the pressure difference between the pressure and the control oil II decreases, thereby reducing the opening control margin of the inlet valve; when the inlet valve is closed, due to the use of the left end of the piston assembly The hydraulic pressure for closing the inlet valve 8 increases, and the pressure in the control chamber V also increases when the inlet valve 8 is closed, and the pressure difference between the pressure and the system return oil III increases, thereby improving the inlet valve closing control margin. The opening and closing control margins of this control structure can be adjusted, which eliminates the problem that the opening control margin is too large and the closing control margin is too small in the original control structure, thereby avoiding the inlet valve caused by the pressure increase of the oil return III of the system 8. The problem of not being able to close normally has improved the control reliability and scope of application.

For the original inlet valve opening and closing control structure (shown in Figure 1), the inlet fuel pressure P _Ⅰ =1.35MPa, the control oil pressure P _Ⅱ =14MPa, the system oil return pressure after the simplified and improved fuel control system P _Ⅲ =1.35MPa, the air pressure The pressure in cavity Ⅵ is the same as the inlet fuel pressure, D1＝18mm, D2＝46mm, D3＝46mm, spring stiffness K＝3.5N/mm, spring precompression when the inlet valve is closed △H＝44.3mm, inlet valve stroke L＝ 8mm. The opening control margin of the inlet valve:

Closing control margin of inlet valve:

It can be seen that the opening control margin of the inlet valve is too large, but the closing control margin is very small, the system fuel pressure fluctuation and the friction of the piston assembly are enough to make the inlet valve unable to close normally after opening.

In the control structure of the present invention, the original cavity VI is used as the adjustment cavity, and the cavity is controlled by selecting throttle nozzles II14 (the diameter of which is represented by d1) and throttle nozzles III15 (the diameter of which is represented by d2) of different diameters. The pressure, taking d1=1mm, d2=1.5mm as an example, adjust the pressure in the chamber

Then the opening control margin of the inlet valve 8:

Closing control margin of inlet valve:

The opening control margin of the inlet valve has decreased, while the closing control margin has been significantly improved, and the control margin is more balanced, which solves the problem that the inlet valve cannot be closed normally under the new environment, and improves the working reliability of the inlet valve opening and closing control structure and scope of application.

Through the AMEsim software, the system modeling and simulation verification of the inlet valve opening and closing control structure before and after the improvement are carried out according to the improved oil return III pressure of the system. In the initial state, the inlet valve is in the closed position, and the control oil II increases linearly from 0MPa to 14MPa within 20s as shown in Figure 3, and then maintains 14MPa; the solenoid valve 12 opens with a delay of 25 seconds, and then a cycle of closing and opening is 20 seconds. The displacement curve of the inlet valve 8 of the original inlet valve opening and closing control structure is shown in Figure 5, and the inlet valve 8 cannot be normally closed by switching of the solenoid valve 12 after the inlet valve 8 is opened. When the opening and closing control structure of the new inlet valve adopts the throttle nozzle II14 with a diameter of 1mm and the throttle nozzle III15 with a diameter of 1.5mm, the displacement curve of the inlet valve 8 is shown in Figure 6, and the inlet valve 8 moves as the solenoid valve 12 switches. It is opened and closed normally, and there is no case that it cannot be closed normally; the opening control margin is 10.89MPa, and the closing control margin is 1.6MPa. The simulation results verify that the original inlet valve opening and closing control structure cannot be closed normally in the new fuel control system, and the new inlet valve opening and closing control structure can be opened and closed normally in the new fuel control system, and the control function reliable.

The above-described embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to allow those skilled in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention with this. The equivalent changes or modifications made by the spirit and essence of the present invention shall fall within the protection scope of the present invention. The technologies, shapes and construction parts not described in detail in the present invention are all known technologies.

Claims (8)

1. A centrifugal afterburner fuel pump inlet valve opening and closing control structure is characterized in that it comprises a fairing (2), the piston assembly is contained in the cup assembly, and the fairing (2) and the cup assembly are enclosed The formed chamber is divided into regulating chamber VI and control chamber V. The regulating chamber VI and the control chamber V can communicate with the control oil II through the oil circuit respectively, and the regulating chamber VI can communicate with the imported fuel oil I; the solenoid valve (12) according to the control signal The control chamber Ⅴ is in communication with the system oil return Ⅲ or disconnected. 2. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 1, wherein the cup assembly is composed of a cup (7) and a valve rod (11), and the piston assembly is composed of Piston skeleton (4) and leather cup (6) are made up of, valve rod (11) passes through the smaller inner hole of cup-shaped part (7), and piston skeleton (4) is fixed on the valve rod (11) and cup-shaped part (7) ) and the fairing (2) are separated into an adjustment chamber VI and a control chamber V, and the leather cup (6) is set on the piston frame (4) so that the piston frame (4) and the cup (7) seal. 3. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 2, characterized in that it also includes an inlet pipe joint (1) and a housing (10), the inlet pipe joint (1) and The end face of the casing (10) is bonded and fixed, and the piston assembly and the cup assembly are installed in the installation space formed by the inlet pipe joint (1) and the casing (10); the fairing (2) is fixed on the inlet pipe joint (1 ) and the housing (10). 4. A centrifugal afterburner fuel pump inlet valve opening and closing control structure according to claim 2, characterized in that a spring (5) is arranged between the fairing (2) and the piston frame (4). 5. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 3, characterized in that, the regulating chamber VI passes through the hole A3 on the cup (7) and on the housing (10). The oil circuit of the oil circuit communicates with the control oil II, and a throttle nozzle II (14) is arranged on the oil circuit. 6. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 3, characterized in that the control chamber V passes through the hole A1 on the cup (7) and on the housing (10). The oil circuit of the oil circuit communicates with the control oil II, and a throttle nozzle I (13) is arranged on the oil circuit. 7. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 1, characterized in that, the cowling (2) is provided with a throttle nozzle III (15), and the regulating chamber VI is throttled Mouth III (15) communicates with imported fuel oil I. 8. A centrifugal afterburner fuel pump inlet valve opening and closing control structure as claimed in claim 3, characterized in that an inlet valve (8) is fixed at the end of the valve rod (11) away from the adjustment chamber VI, and the inlet valve (8 ) fit the housing (10).

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