CN113738550A

CN113738550A - Damping-reducing fuel supply system

Info

Publication number: CN113738550A
Application number: CN202111032577.7A
Authority: CN
Inventors: 司国雷; 陈君辉; 李侃; 王嘉磊; 邓熠; 韦德斌; 王静; 李彬杰
Original assignee: Sichuan Aerospace Fenghuo Servo Control Technology Co ltd
Current assignee: Sichuan Aerospace Fenghuo Servo Control Technology Co ltd
Priority date: 2021-09-03
Filing date: 2021-09-03
Publication date: 2021-12-03
Anticipated expiration: 2041-09-03
Also published as: CN113738550B

Abstract

The invention discloses a damping-reducing fuel supply system.A pumping device is started, and a pumping oil way pumps fuel from an oil tank; the fuel oil of the pumping oil way supplies oil to the engine through the starting oil way, and because the booster valve is arranged between the main oil supply way and the pumping oil way, when the oil pressure of the oil inlet is continuously increased, the valve core overcomes the elasticity of the spring, so that the space of the springless cavity is enlarged, and finally the oil inlet is communicated with the oil outlet, and the fuel oil can enter the main oil supply way from the oil outlet after being communicated, and the main oil supply way supplies oil to the engine. In the starting stage, the pressure is continuously increased by the starting oil circuit and is gradually converted into the oil supply of the main oil supply circuit, and when fuel oil passes through the booster valve, the fuel oil directly flows from the oil inlet to the oil outlet without bypassing the valve core, so that the power loss caused by flow resistance in the fuel oil pumping process can be reduced, and the pumping efficiency is improved.

Description

Damping-reducing fuel supply system

Technical Field

The invention relates to the field of engine flow supply control, in particular to a damping-reducing fuel supply system.

Background

The electric fuel pump is one of the key parts of the multi-electric engine due to the characteristics of simple structure, variable flow and the like, and plays an important role in supplying oil to the engine according to the requirement.

In the existing electric fuel pump technology for an aircraft engine, a servo motor drives a fuel pump to pump fuel, when the engine forms a normal and stable fuel supply state, the fuel is supplied by a main oil way, a one-way valve is arranged on the main oil way, the oil inlet end forms enough pressure to jack the one-way valve, the fuel flows to the engine through the one-way valve, the fuel needs to jack a valve core through the one-way valve, flows through a gap between the periphery of the valve core and a valve body, and flows backwards continuously through a spring cavity of the one-way valve, so that high flow resistance is achieved, and power loss is caused.

For those skilled in the art, how to reduce the power loss caused by the flow resistance when pumping fuel is a technical problem to be solved at present.

Disclosure of Invention

The core of the invention is to provide a damping-reducing fuel supply system which can reduce the damping of fuel flowing through a booster valve, reduce power loss and improve pumping efficiency.

A damping-reducing fuel supply system comprises a pumping oil way, a starting oil way, a main oil supply way, a pumping device and a booster valve;

the pumping device is arranged on the pumping oil way, so that the pumping oil way pumps fuel oil from an oil tank; one end of the starting oil way is communicated with the pumping oil way and is used for supplying oil to the engine;

the pressure increasing valve comprises a valve body, a valve core and a spring, the valve core divides the valve body into a spring-free cavity and a spring cavity which are mutually independent, and the spring is positioned in the spring cavity and can apply elasticity to the valve core;

an oil inlet is formed in the end part of the valve body without the spring cavity, and an oil outlet is formed in the side wall of the valve body; the oil inlet of the booster valve is connected with the pumping oil way, and the oil outlet of the booster valve is connected with the main oil supply way;

the pumping device pumps fuel oil to the oil inlet of the booster valve, applies pressure to the valve core to compress the spring, increases the volume of the spring-free cavity, and further enables the oil inlet and the oil outlet to be communicated with each other.

Optionally, a sealing table is arranged on the inner wall of the valve body, and the valve core is pressed against the sealing table in an initial state in a sealing manner by the spring, so that the oil inlet and the oil outlet are isolated from each other.

Optionally, the periphery of the valve core is in contact with the inner wall of the valve body to guide sliding;

the inner wall of the valve body is provided with two sections with different diameters, the sealing platform is formed between the two sections, and the inner diameter of the section on the oil inlet side is smaller than that of the section on the spring cavity side.

Optionally, the position where the outer periphery of the valve element contacts the seal land is a tapered surface.

Optionally, the inner wall of the valve body comprises three sections with different diameters, and the diameters of the section located on one side of the spring cavity, the section located on one side of the oil inlet and the middle section are sequentially increased; the sealing table is formed between the section on the oil inlet side and the middle section;

the valve core comprises a sealing plate and a guide rod, and the guide rod can be matched with a section on one side of the spring cavity to guide and slide; the sealing plate is located in the middle section and can be matched and sealed with the sealing platform.

Optionally, an oil return port is formed in a side wall of the spring cavity of the pressure increasing valve, the oil return port is communicated with a pressure relief oil path, the pressure relief oil path is communicated with the oil tank, and oil in the spring cavity can be discharged through the pressure relief oil path.

Optionally, the pressure relief oil path is provided with an oil return damper to damp fuel flowing through.

Optionally, the starting oil path is provided with a control valve, and the starting oil path is closed after starting is completed.

The invention provides a damping-reducing fuel supply system.A pumping device is started, and a pumping oil way pumps fuel from an oil tank; the fuel oil of the pumping oil way supplies oil to the engine through the starting oil way, and because the booster valve is arranged between the main oil supply way and the pumping oil way, when the oil pressure of the oil inlet is continuously increased, the valve core overcomes the elasticity of the spring, so that the space of the springless cavity is enlarged, and finally the oil inlet is communicated with the oil outlet, and the fuel oil can enter the main oil supply way from the oil outlet after being communicated, and the main oil supply way supplies oil to the engine. In the starting stage, the pressure is continuously increased by the starting oil circuit and is gradually converted into the oil supply of the main oil supply circuit, and when fuel oil passes through the booster valve, the fuel oil directly flows from the oil inlet to the oil outlet without bypassing the valve core, so that the power loss caused by flow resistance in the fuel oil pumping process can be reduced, and the pumping efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a first embodiment of a reduced damping fuel supply system according to the present invention;

fig. 2 is a structural diagram of a second embodiment of the damping-reducing fuel supply system provided by the invention.

The figure includes:

the oil pumping system comprises a pumping oil path 1, an oil tank 11, a starting oil path 2, a main oil supply path 3, a pumping device 4, a booster valve 5, a valve body 51, a sealing table 511, a valve core 52, a sealing plate 521, a guide rod 522, a spring 53, an oil inlet 54, an oil outlet 55, an oil return port 56, a pressure relief oil path 6 and an oil return damper 61.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the damping reducing fuel supply system of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 and fig. 2, the structural diagrams of two specific embodiments of the damping-reducing fuel supply system provided by the invention are respectively shown; the system comprises a pumping oil path 1, a starting oil path 2, a main oil supply path 3, a pumping device 4 and a booster valve 5; the pumping oil passage 1 draws fuel oil and delivers it to the engine via the starting oil passage 2 and the main oil supply passage 3, respectively.

The input end of the pumping oil way 1 is communicated with the oil tank 11, and fuel oil can be pumped from the oil tank 11; the pumping device 4 is arranged on the pumping oil circuit 1 and used for generating power for delivering fuel oil so that the pumping oil circuit 1 draws the fuel oil from the oil tank 11. The pumping device 4 comprises a fuel pump motor, and the motor drives the fuel pump to rotate to enable the pumping oil circuit 1 to generate suction force to draw fuel from the oil tank 11.

One end of the starting oil path 2 is communicated with the pumping oil path 1, the other end of the starting oil path is connected with the engine and used for supplying oil to the engine, when the fuel oil reaches the connecting point of the starting oil path 2 after passing through the pumping device 4, a part of the fuel oil flows into the starting oil path 2 and flows to the engine through the starting oil path 2.

The booster valve 5 is located between the pumping oil path 1 and the main oil supply path 3, the booster valve 5 comprises a valve body 51, a valve core 52 and a spring 53, the valve body 51 is internally provided with a cavity, the valve core 52 divides the valve body 51 into a spring-free cavity and a spring-containing cavity which are mutually independent, the left side of the valve core 52 in fig. 1 and 2 is provided with the spring-free cavity, and the right side of the valve core 52 in fig. 1 and 2 is provided with the spring-containing cavity; valve spool 52 is movable translationally within valve body 51 to vary the relative proportions of the sprung and unsprung chambers. The contact part between the valve core 52 and the valve body 51 is kept sealed, and the fuel can be blocked from flowing between the two cavities.

The spring 53 is located in the spring-containing chamber, and can apply an elastic force to the valve body 52, and the valve body 52 is caused to apply an elastic force toward the unsprung chamber by the elastic force of the spring 53, and the valve body 52 abuts against the end portion of the valve body 51 by the elastic force of the spring 53 in the absence of other external force.

As shown in fig. 1 and 2, when there is no external force, the valve core 52 is pressed against the left end of the inner wall of the valve body 51 by the elastic force of the spring 53, at this time, the space between the oil inlet 54 and the oil outlet 55 is blocked, and the fuel cannot flow from the oil inlet 54 to the oil outlet 55.

An oil inlet 54 of the booster valve 5 is connected with the pumping oil path 1, an oil outlet 55 is connected with the main oil supply path 3, the pumping device 4 pumps fuel oil to the oil inlet 54 of the booster valve 5, pressure is applied to the valve core 52 to compress the spring 53, the volume of the spring-free cavity is increased, and the oil inlet 54 and the oil outlet 55 are communicated with each other.

The specific working process is as follows: when the pumping device 4 is started, the pumping oil circuit 1 forms oil pressure, the oil pressure is small in the initial stage, a part of oil flows to the engine through the starting oil circuit 2, at the moment, the oil pressure cannot push the valve core 52 to resist the elastic force of the spring 53, and the valve core 52 enables the oil outlet 55 to be kept in a closed state; as the oil pressure is increased, the pressure generated on the spool 52 is increased until the pressure of the oil on the spool 52 exceeds the elastic force of the spring 53, the spool 52 resists the elastic force of the spring 53, the spring 53 is compressed, the volume of the unsprung chamber is increased, and the volume of the sprung chamber is decreased, that is, the spool 52 is pushed to the right in fig. 1 and 2. Along with the valve core 52 continuously moves rightwards, the space of the springless cavity is continuously increased, the oil outlet 55 is gradually led to enter the range of the springless cavity, the oil outlet 55 is communicated with the springless cavity, fuel oil enters the springless cavity from the oil inlet 54 and then is discharged from the oil outlet 55, the valve core 52 is sealed with the inner wall of the valve body 51, therefore, the fuel oil cannot cross the valve core 52 to reach the springless cavity, the fuel oil directly enters the main oil supply path 3 from the oil outlet 55, therefore, the flow resistance generated when the fuel oil passes through the booster valve 5 during pumping can be reduced, the power loss caused by the flow resistance is reduced, and the pumping efficiency is improved.

On the basis of the scheme, the sealing platform 511 is arranged on the inner wall of the valve body 51, the inner wall of the valve body 51 is provided with sections with different inner diameters, and a step structure is formed at the position with the suddenly changed inner diameter, as shown in fig. 1 and fig. 2, the step surface faces the valve core 52, the valve core 52 is pressed and pressed on the sealing platform 511 in an initial state in a sealing mode through the spring 53, at the moment, the sealing platform 511 and the valve core 52 are pressed and connected in a pressing mode to form sealing, so that the oil inlet 54 and the oil outlet 55 are isolated from each other, and in a limiting state of pressing and connecting the spring 53, the springless cavity still has a certain space for fuel to enter.

The invention herein provides two specific arrangements of the booster valve 5, as shown in figures 1 and 2 respectively.

First, as shown in fig. 1, the outer periphery of the valve element 52 is in contact with the inner wall of the valve body 51 to slide in a guiding manner, the outer periphery of the valve element 52 is in mutual engagement with the inner wall of the valve body 51 to perform guiding translation, and the valve element 52 is reciprocally translated in the left-right direction shown in fig. 1 inside the valve body 51.

The inner wall of the valve body 51 is provided with two sections with different diameters, and the inner diameter of the section at the oil inlet 54 side is smaller than that of the section at the spring cavity side. As shown in FIG. 1, the inner diameter of the left section is smaller, the inner diameter of the right section is larger, a sealing platform 511 is formed between the two sections, and the outer wall of the valve core 52 and the inner wall of the section with the larger inner diameter of the valve body 51 are in mutual matching contact to realize guiding.

Specifically, as shown in fig. 1, the position where the outer periphery of the valve element 52 contacts the sealing land 511 is a tapered surface, so that when the valve element 52 contacts the sealing land 511, a tighter sealing effect can be exerted, and meanwhile, the fault tolerance is effective, and the influence on the sealing caused by the machining error is reduced.

Secondly, as shown in fig. 2, the inner wall of the valve body 51 includes three sections with different diameters, and the diameters of the section located on the spring chamber side, the section located on the oil inlet 54 side, and the middle section are sequentially increased, that is, the inner diameter on the right side is the smallest, the inner diameter on the left side is slightly larger, and the inner diameter in the middle is the largest in fig. 2.

A sealing land 511 is formed between the section on the side of the oil inlet 54 and the intermediate section for cooperation with the valve element 52.

The valve spool 52 includes a seal plate 521 and a guide rod 522, and the outer diameter of the guide rod 522 is smaller than that of the seal plate 521; the guide rod 522 can be matched with the section on the side with the spring cavity for guiding and sliding, and the sealing plate 521 is positioned in the middle section and is not contacted with the inner wall of the middle section; the sealing plate 521 can be fitted and sealed with the sealing table 511, and the sealing plate 521 can be pressed against the step surface of the sealing table 511 by the elastic force of the spring 53 during sealing to form annular surface contact.

On the basis of any one technical scheme and the mutual combination of the technical schemes, the side wall of the spring cavity of the booster valve 5 is provided with an oil return port 56, the oil return port 56 is communicated with a pressure relief oil way 6, the pressure relief oil way 6 is communicated with an oil tank 11, and oil in the spring cavity can be discharged through the pressure relief oil way 6; when the spring 53 is compressed, the volume of the spring chamber is reduced, and the fuel in the spring chamber is discharged from the oil return port 56 and enters the fuel tank 11; when the spring 53 is reset, the volume of the spring cavity is increased, and the fuel in the fuel tank 11 flows back to enter the spring cavity through the pressure relief oil path 6.

The pressure relief oil circuit 6 is provided with the oil return damper 61 to damp fuel oil flowing through, the oil return damper 61 can be arranged to block the flow of the fuel oil in the pressure relief oil circuit 6, the flow of the fuel oil flowing through the pressure relief oil circuit 6 is smoother, and sudden change of pressure is prevented.

Specifically, a control valve, not shown in the drawings, is provided in the starting oil passage 2, and after completion of starting, the starting oil passage 2 is closed and fuel is supplied to the engine only from the main fuel supply passage 3.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A damping-reduction fuel supply system is characterized by comprising a pumping oil way (1), a starting oil way (2), a main oil supply way (3), a pumping device (4) and a booster valve (5);

the pumping device (4) is arranged on the pumping oil way (1) to enable the pumping oil way (1) to draw fuel oil from an oil tank (11); one end of the starting oil way (2) is communicated with the pumping oil way (1) and is used for supplying oil to the engine;

the booster valve (5) comprises a valve body (51), a valve core (52) and a spring (53), the valve core (52) divides the valve body (51) into a spring-free cavity and a spring cavity which are independent of each other, and the spring (53) is positioned in the spring cavity and can apply elastic force to the valve core (52);

an oil inlet (54) is formed in the end part of the valve body (51) without the spring cavity, and an oil outlet (55) is formed in the side wall of the valve body (51); the oil inlet (54) of the pressurization valve (5) is connected with the pumping oil way (1), and the oil outlet (55) is connected with the main oil supply way (3);

the pumping device (4) pumps fuel oil to the oil inlet (54) of the booster valve (5), pressure is applied to the valve core (52) to compress the spring (53), the volume of the spring-free cavity is increased, and the oil inlet (54) and the oil outlet (55) are communicated with each other.

2. Damping-reducing fuel supply system according to claim 1, characterized in that the inner wall of the valve body (51) is provided with a sealing land (511), and the valve core (52) is pressed against the sealing land (511) in an initial state by the spring (53) in a sealing manner, so that the oil inlet (54) and the oil outlet (55) are isolated from each other.

3. The damping-reducing fuel supply system according to claim 2, characterized in that the outer periphery of the valve spool (52) is in contact fit with the inner wall of the valve body (51) to guide sliding;

the inner wall of the valve body (51) is provided with two sections with different diameters, the sealing table (511) is formed between the two sections, and the inner diameter of the section on the oil inlet (54) side is smaller than that of the section on the spring cavity side.

4. The damping-reducing fuel supply system according to claim 3, wherein a position where the outer periphery of the spool (52) contacts the seal land (511) is a tapered surface.

5. The damping-reducing fuel supply system according to claim 2, wherein the inner wall of the valve body (51) comprises three sections with different diameters, and the diameters of the section at the spring cavity side, the section at the oil inlet (54) side and the middle section are increased in sequence; the section on one side of the oil inlet (54) and the middle section form the sealing platform (511);

the valve core (52) comprises a sealing plate (521) and a guide rod (522), and the guide rod (522) can be matched with a section on the spring cavity side for guiding and sliding; the sealing plate (521) is located in the middle section and can be matched and sealed with the sealing table (511).

6. The damping-reduction fuel supply system according to any one of claims 1 to 5, characterized in that the spring chamber side wall of the pressure increasing valve (5) is provided with an oil return port (56), the oil return port (56) is communicated with a pressure relief oil path (6), the pressure relief oil path (6) is communicated with the oil tank (11), and oil in the spring chamber can be discharged through the pressure relief oil path (6).

7. Damping-reducing fuel supply system according to claim 6, characterized in that the pressure relief circuit (6) is provided with a return damping (61) for damping the fuel flowing through.

8. Damping-reduction fuel supply system according to claim 6, characterized in that the starting circuit (2) is provided with a control valve to close the starting circuit (2) after starting is completed.