Pressurizing turn-off device and method capable of resisting pressure pulse

Abstract

The invention possibly relates to the technical field of aero-engines and aero-engine control systems, in particular to an anti-pressure-pulse supercharging turn-off device and method. Comprising a main shutoff valve assembly and a pulse pressure relief valve assembly. The pulse pressure relief valve assembly is arranged in a main valve center cavity in the main shutoff valve assembly, and a sensing cavity of the pulse pressure relief valve assembly is communicated with a control cavity of the main shutoff valve assembly; an axial blind hole is formed in the center of the side, close to a sensing cavity, of a pulse pressure relief valve in the pulse pressure relief valve assembly, and a radial pressure relief through hole communicated with the axial blind hole is further formed in the pulse pressure relief valve in the pulse pressure relief valve assembly. A radial main through hole communicated with the central cavity is formed in a main valve in the main shutoff valve assembly, a pulse pressure relief valve in the pulse pressure relief valve assembly can slide along the central cavity of the main valve in the pulse pressure relief valve assembly, and pulse pressure relief is achieved when the pressure relief through hole is communicated with the main through hole. A pressurization turn-off device of the fuel oil adjusting mechanism can meet the pressurization turn-off function; in the start-stop stage of the engine, the metering fuel pressure pulsation can be reduced; and the influence of the fuel pressure pulsation of the control cavity on the functional performance is small. The device is already used on a certain type of aero-engine, and the effect is good.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine control systems, and in particular relates to a pressure pulse-resistant boost shutoff device and method. Background Art

[0002] In order to eliminate engine surge and special maneuvers during flight, the aircraft has a boost shutoff function requirement for fuel. The shutoff valve in the traditional fuel regulating mechanism usually only has a basic boost shutoff function. However, under extreme conditions, such as changes in flight altitude and rapid changes in engine load, the pressure pulse of the fuel system may cause unstable fuel supply, affecting engine performance and even safety. Summary of the invention

[0003] Purpose of the present invention: In order to solve at least one technical problem in the prior art, the present invention provides a boost shut-off device and method resistant to pressure pulses to meet the fuel boost shut-off requirements of aircraft under special circumstances and improve the stability margin of metered fuel.

[0004] Technical solution of the present invention: In order to achieve the above-mentioned invention objectives, according to the first aspect of the present invention, a pressure pulse resistant boost shut-off device is proposed, comprising a main shut-off valve assembly and a pulse pressure relief valve assembly; the pulse pressure relief valve assembly is arranged in the central cavity of the main valve in the main shut-off valve assembly, and the sensing cavity of the pulse pressure relief valve assembly is connected with the control cavity of the main shut-off valve assembly; an axial blind hole is provided near the center of one side of the sensing cavity of the pulse pressure relief valve in the pulse pressure relief valve assembly, and a radial pressure relief through hole connected with the axial blind hole is also provided on the pulse pressure relief valve in the pulse pressure relief valve assembly; a radial main through hole connected with the central cavity is provided on the main valve in the main shut-off valve assembly, and the pulse pressure relief valve in the pulse pressure relief valve assembly can slide along the central cavity of the main valve in the pulse pressure relief valve assembly, and pulse pressure relief is achieved when the pressure relief through hole is connected with the main through hole.

[0005] The sensing chamber in the valve assembly refers to the chamber on one side of the valve used to sense pressure, and the control chamber refers to the chamber on one side of the valve where a spring is arranged.

[0006] In a possible embodiment, the main shut-off valve assembly includes a blind hole nut 1, a clamping nut 2, a rubber ring 3, a nut 4, an adjusting screw 5, a spring seat 6, a main spring 7, a main valve 8, and a valve bushing 9; the nut 4 is threadedly mounted on the housing; a group of radial through holes are provided at the end of the nut 4 to communicate with the servo oil; the adjusting screw 5 is threadedly mounted on the nut 4; the blind hole nut 1 and the clamping nut 2 are threadedly mounted on the adjusting screw 5, and together they play a role in adjusting the preload force of the main spring 7 within a certain range, so as to realize the function of steplessly adjusting the metering fuel opening pressure within a certain range; the main shut-off valve assembly presses the spring seat 6 and the main valve 8 respectively on the adjusting screw 5 and the valve through the main spring 7 On the bushing 9; the valve bushing 9 is provided with an annular trapezoidal groove on the convex shoulder at the control chamber end. By setting the annular trapezoidal groove, the contact area between the main valve 8 and the valve bushing 9 at the valve closing position can be reduced, and the influence of liquid tension on the valve opening pressure can be reduced; a small hole c is provided at the bottom of the trapezoidal groove to communicate with the oil return chamber to avoid the formation of a dead cavity in the control chamber; four circular through holes a are provided in the oil return chamber, and when the main valve 8 moves quickly, the fuel in the control chamber can be released quickly to avoid pressure holding; four special-shaped holes b are provided in the fuel outlet chamber, and the shape of the holes can be selected according to the use requirements; an annular groove with a depth of 0.5mm and a width of 10.5mm is provided inside the bushing as the oil return chamber inside the bushing.

[0007] In a possible embodiment, the main valve 8 is hollow inside, and a ring groove is provided on the left side for assembling the retaining ring 10, and a through hole d and an inclined hole e are also provided on it; an annular groove with a depth of 0.75 mm and a width of 10.5 mm is provided in the middle part of the outside of the main valve 8, and the through hole d and the inclined hole e are provided on the annular groove; a first annular groove is provided at a position corresponding to the through hole d inside the main valve 8, and a second annular groove is provided at a position corresponding to the inclined hole e; in the actual assembly structure, the through hole d and the inclined hole e connect the spring chamber inside the main valve 8 with the oil return chamber.

[0008] In a possible embodiment, the pulse pressure relief valve assembly includes a retaining ring 10, a pulse pressure relief valve 11, and a pulse pressure relief spring 12; the pulse pressure relief valve 11 and the pulse pressure relief spring 12 are installed in the hollow cavity inside the main valve, and the retaining ring 10 is used to control the pulse pressure relief valve 11 and the pulse pressure relief spring 12 to move only inside the main valve 8, and the pulse pressure relief spring 12 presses the pulse pressure relief valve 11 onto the retaining ring 10 by the pre-tightening force.

[0009] Preferably, the retaining ring 10 is made of metal and has an annular configuration.

[0010] In a possible embodiment, the opening end of the axial blind hole on the pulse pressure relief valve 11 has a trumpet-shaped expansion, and two through holes are provided at the axial tail end to connect the axial blind hole of the pulse pressure relief valve with the oil return chamber.

[0011] According to a second aspect of the present invention, a fuel regulator is provided, which adopts the above-mentioned boost shut-off device resistant to pressure pulses.

[0012] According to the third aspect of the present invention, a pressure pulse resistant boost shutoff method is proposed, which adopts the above-mentioned pressure pulse resistant boost shutoff device, and the specific process is as follows: the main shutoff valve assembly control chamber communicates with servo oil. During the engine starting stage, the servo oil is low-pressure oil. As the metered fuel pressure increases, the main valve 8 gradually opens to the left, and the metered fuel communicates with the fuel outlet to achieve the boost function; when the control chamber communicates with high-pressure oil, the main valve 8 stops to the right under the action of the spring force of the main spring 7 and the liquid pressure in the control chamber, and the main valve 8 is closed to achieve the shutoff function; when the engine starts and stops, the metered fuel inlet suddenly appears The pressure increases sharply, and the main valve 8 moves rapidly to the left under the action of liquid pressure, and the pressure in the control chamber increases rapidly. Since the control chamber and the oil return chamber are connected with the oil return chamber through the through hole c on the valve bushing 9 and the through hole h on the pulse pressure relief valve 11, the formation of a dead chamber in the control chamber is avoided. When the pressure in the control chamber increases in a short period of time to allow the pulse pressure relief valve 11 to overcome the preload of the pulse pressure relief spring 12, the pulse pressure relief valve 11 and the main valve 8 produce relative movement, and the movement direction is opposite to the movement direction of the main valve 8. At this time, part of the hydraulic kinetic energy is converted into the elastic potential energy of the pulse pressure relief spring 12, thereby realizing the anti-pressure pulse function.

[0013] When the fuel pressure in the control chamber pulsates, the pulse pressure relief valve 11 and the pulse pressure relief spring 12 together form a damping device. Since the circular through hole on the pulse pressure relief valve 11 and the circular through hole on the main valve 8 connect the control chamber with the oil return outlet, the control chamber will not become a dead chamber. When the engine throttle lever is fully opened and the metered fuel inlet pressure suddenly increases, the control chamber pressure will not increase sharply, and the boost shutoff device can operate stably and reliably.

[0014] In the initial state, the main valve 8 rests on the valve bushing 9 under the action of the main spring 7, and the pulse pressure relief valve 11 rests on the retaining ring 10 inside the main valve 8 under the action of the pulse pressure relief spring 12; at this time, the control chamber communicates with the servo oil, and as the metered fuel pressure increases, the pressure acting on the right end of the main valve 8 is greater than the preload force of the main spring 7 in the initial state, and the main valve 8 gradually opens to the left. When the special-shaped hole of the valve bushing 9 opens, the metered fuel communicates with the fuel outlet to achieve the boost function.

[0015] When the car needs to be stopped and shut down, the fuel in the control chamber communicates with the high-pressure oil. Under the action of the high-pressure oil pressure and the spring force of the main spring 7, the main valve 8 stops right, closing the special-shaped hole of the valve bushing 9, and the fuel channel of the fuel outlet is closed after metering, realizing the shut-off function.

[0016] Beneficial effects of the present invention

[0017] The boost shutoff device of the fuel regulating mechanism of the present invention can meet the boost shutoff function; can reduce the metering fuel pressure pulsation during the engine start-stop stage; and the control chamber fuel pressure pulsation has little effect on its functional performance. The device has been used on a certain type of aircraft engine with good results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a structural principle diagram of a boost shutoff device according to a preferred embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the combined structure of the shut-off valve assembly and the pulse pressure relief valve assembly of the preferred embodiment of the present invention;

[0021] Figure 3 This is a schematic structural diagram of a valve bushing 9 according to a preferred embodiment of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the main valve 8 of a preferred embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the pulse pressure relief valve 11 according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] A pressure pulse resistant boost shutoff device comprises a blind hole nut 1, a compression nut 2, a rubber ring 3, a nut 4, an adjusting screw 5, a spring seat 6, a main spring 7, a main valve 8, a valve bushing 9, a retaining ring 10, a pulse pressure relief valve 11, and a pulse pressure relief spring 12;

[0028] Installation method and position of main components are shown in Figure 1 , the main components structure see Figure 2 , Figure 3 and Figure 4 ; Valve bushing 9 and all fuel pipelines are installed inside the housing; nut 4 is installed on the housing through threads; adjusting screw 5 is installed on nut 4 through threads; blind hole nut 1 and compression nut 2 are installed on adjusting screw 5 through threads; spring seat 6, main spring 7, main valve 8, retaining ring 10, pulse pressure relief valve 11 and pulse pressure relief spring 12 are arranged inside nut 4 and housing; wherein spring seat 6 and main valve 8 are pressed on adjusting screw 5 and valve bushing 9 respectively through main spring 7; retaining ring 10, pulse pressure relief valve 11 and pulse pressure relief spring 12 are arranged inside main valve 8; retaining ring 10 is used to press pulse pressure relief valve 11 and pulse pressure relief spring 12 The impulse pressure relief spring 12 is controlled to move only inside the main valve 8, and the pulse pressure relief spring 12 presses the pulse pressure relief valve 11 onto the retaining ring 10 by the preload force; the right end of the valve bushing 9 communicates with the metered fuel; the special-shaped hole on the valve bushing 9 communicates with the fuel outlet pipeline; the circular through hole in the front of the valve bushing 9 communicates with the return oil port; the right end of the nut 4 has an oil through hole that communicates with the servo oil circuit; the pulse pressure relief valve 11 has an internal cavity, and the control cavity communicates with it; there are two circular holes on the right end of the pulse pressure relief valve 11, and there are two circular through holes on the main valve 8 corresponding to the installation position, and the fuel in the control cavity can communicate with the return oil port through the circular holes of the two valves.

[0029] In the initial state, the main valve 8 rests on the valve bushing 9 under the action of the main spring 7, and the pulse pressure relief valve 11 rests on the retaining ring 10 inside the main valve 8 under the action of the pulse pressure relief spring 12; at this time, the control chamber communicates with the servo oil, and as the metered fuel pressure increases, the pressure acting on the right end of the main valve 8 is greater than the preload force of the main spring 7 in the initial state, and the main valve 8 gradually opens to the left. When the special-shaped hole of the valve bushing 9 opens, the metered fuel communicates with the fuel outlet to achieve the boost function.

[0030] When the car needs to be stopped and shut down, the fuel in the control chamber communicates with the high-pressure oil. Under the action of the high-pressure oil pressure and the spring force of the main spring 7, the main valve 8 stops right, closing the special-shaped hole of the valve bushing 9, and the fuel channel of the fuel outlet is closed after metering, realizing the shut-off function.

[0031] When the fuel pressure in the control chamber pulsates, the pulse pressure relief valve 11 and the pulse pressure relief spring 12 together form a damping device. Since the circular through hole on the pulse pressure relief valve 11 and the circular through hole on the main valve 8 connect the control chamber with the oil return outlet, the control chamber will not become a dead chamber. When the engine throttle lever is fully opened and the metered fuel inlet pressure suddenly increases, the control chamber pressure will not increase sharply, and the boost shutoff device can operate stably and reliably.

[0032] By changing the screwing length of the adjusting screw 5 , the initial compression amount of the main spring 7 can be changed, and the preload force of the main spring 7 can be changed, thereby changing the initial opening pressure of the boost shutoff device.

[0033] The main valve bushing 9 structural diagram is shown in Figure 3 .

[0034] The main valve 8 structural diagram is shown in Figure 4 .

[0035] The schematic diagram of the pulse pressure relief valve 11 is shown in Figure 5 .

[0036] The invention has been successfully applied to a certain type of fuel regulating mechanism for the boost shutoff function, and at the same time ensures the stability of the metered fuel output when the control chamber pressure fluctuates. The invention has a wide range of application prospects, and at the same time has certain guiding significance and reference value for the development of fuel regulating mechanisms with boost shutoff functions.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A pressure pulse resistant boost shut-off device, characterized in that: It includes a main shut-off valve assembly and a pulse pressure-releasing valve assembly; the pulse pressure-releasing valve assembly is arranged in the central cavity of the main valve in the main shut-off valve assembly, and the sensing cavity of the pulse pressure-releasing valve assembly is connected with the control cavity of the main shut-off valve assembly; an axial blind hole is provided in the center of one side of the sensing cavity of the pulse pressure-releasing valve in the pulse pressure-releasing valve assembly, and a radial pressure-releasing through hole connected with the axial blind hole is also provided on the pulse pressure-releasing valve in the pulse pressure-releasing valve assembly; a radial main through hole connected with the central cavity is provided on the main valve in the main shut-off valve assembly, and the pulse pressure-releasing valve in the pulse pressure-releasing valve assembly can slide along the central cavity of the main valve in the pulse pressure-releasing valve assembly, and pulse pressure release is achieved when the pressure-releasing through hole is connected with the main through hole.

2. A pressure pulse resistant boost shutoff device according to claim 1, characterized in that: The main shut-off valve assembly comprises a blind hole nut (1), a clamping nut (2), a rubber ring (3), a nut (4), an adjusting screw (5), a spring seat (6), a main spring (7), a main valve (8), and a valve bushing (9); the nut (4) is mounted on the housing through a thread; the adjusting screw (5) is mounted on the nut (4) through a thread; the blind hole nut (1) and the clamping nut (2) are mounted on the adjusting screw (5) through a thread, and together they play a role in adjusting the preload force of the main spring (7) within a certain range, thereby achieving a certain The main shut-off valve assembly has the function of steplessly adjusting the metering fuel opening pressure within a range; the main shut-off valve assembly presses the spring seat (6) and the main valve (8) onto the adjusting screw (5) and the valve bushing (9) respectively through the main spring (7); the valve bushing (9) is provided with an annular trapezoidal groove on the convex shoulder at the control chamber end, a through hole c is provided at the bottom of the trapezoidal groove to communicate with the oil return chamber, four circular through holes a are provided at the oil return chamber, four special-shaped holes b are provided at the fuel outlet chamber, and an annular groove is provided inside the bushing as the oil return chamber inside the bushing.

3. A pressure pulse resistant boost shutoff device according to claim 1, characterized in that: The pulse pressure relief valve assembly comprises a retaining ring (10), a pulse pressure relief valve (11), and a pulse pressure relief spring (12); the pulse pressure relief valve (11) and the pulse pressure relief spring (12) are installed in a hollow cavity inside the main valve, and the retaining ring (10) controls the pulse pressure relief valve (11) and the pulse pressure relief spring (12) to move only inside the main valve (8), and the pulse pressure relief spring (12) presses the pulse pressure relief valve (11) onto the retaining ring (10) by a pre-tightening force.

4. A pressure pulse resistant boost shutoff device according to claim 3, characterized in that: The main valve (8) is hollow inside, and a ring groove is provided on the left side for assembling the retaining ring (10), and a through hole d and an inclined hole e are also provided on it; an annular groove is provided on the middle part of the outside of the main valve (8), and the through hole d and the inclined hole e are provided on the annular groove; a first annular groove is provided at a position corresponding to the through hole d inside the main valve (8), and a second annular groove is provided at a position corresponding to the inclined hole e; in the actual assembly structure, the through hole d and the inclined hole e connect the control chamber inside the main valve (8) with the oil return chamber.

5. A pressure pulse resistant boost shutoff device according to claim 3, characterized in that: The retaining ring (10) is made of metal and has an annular configuration.

6. A pressure pulse resistant boost shutoff device according to claim 1, characterized in that: The open end of the axial blind hole on the pulse pressure relief valve (11) has a trumpet-shaped expansion, and two radial through holes are provided at the axial tail end to connect the axial blind hole of the pulse pressure relief valve with the oil return chamber.

7. A fuel regulator, characterized in that: A pressure pulse resistant boost shut-off device as described in any one of claims 1 to 6 is used.

8. A pressure pulse resistant boost shutoff method, using a pressure pulse resistant boost shutoff device according to any one of claims 1 to 6, characterized in that: The control chamber communicates with the servo oil. During the engine starting stage, the servo oil is low-pressure oil. As the metered fuel pressure increases, the main valve (8) gradually opens to the left, and the metered fuel communicates with the fuel outlet to achieve the boost function. When the control chamber communicates with the high-pressure oil, the main valve (8) stops right under the action of the spring force of the main spring (7) and the control chamber fluid pressure, and the main valve (8) is closed to achieve the shutoff function. When the engine is started and stopped, the metered fuel inlet suddenly experiences a sharp increase in pressure, and the main valve (8) moves rapidly to the left under the action of the fluid pressure, and the pressure in the control chamber is rapidly increased. Increase, because the control chamber and the oil return chamber are connected with the oil return chamber through the through hole c on the valve bushing (9) and the through hole h on the pulse pressure relief valve (11), the control chamber is prevented from forming a dead space, and when the pressure in the control chamber increases in a short period of time to allow the pulse pressure relief valve (11) to overcome the preload of the pulse pressure relief spring (12), the pulse pressure relief valve (11) and the main valve (8) produce relative movement, and the movement direction is opposite to the moving direction of the main valve (8). At this time, part of the hydraulic kinetic energy is converted into the elastic potential energy of the pulse pressure relief spring (12), thereby realizing the anti-pressure pulse function.

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