An aviation plunger pump with a composite material housing and wide temperature range for vibration and noise reduction

Abstract

The present invention discloses an aviation plunger pump with a composite material housing that can reduce vibration and noise over a wide temperature range. The composite material portion of the composite material housing plunger pump includes an intermediate housing and an oil suction port end cover composite material portion. The composite material housing in the present invention is manufactured using composite material 3D printing technology. The matrix material uses thermoplastic special engineering plastics PEKK and chopped carbon fibers that can withstand high and low temperatures and have a low thermal expansion coefficient. During the printing process, continuous carbon fibers can be further added according to the actual stress conditions of the composite material parts, thereby further enhancing the strength of the composite material parts. Compared to traditional aluminum alloy housings, the composite material housing reduces weight by more than 40%, can withstand high temperatures of 250°C, and can work stably under low temperature conditions, meeting the wide temperature range requirements of aviation plunger pumps. Compared to aviation plunger pumps that do not use composite material housings, aviation plunger pumps that use composite material housings can effectively reduce the vibration transmitted to the housing and generate less noise.

Description

Technical Field

[0001] The present invention relates to the field of aviation plunger pumps, and more particularly to an aviation plunger pump with a composite material housing having a wide temperature range and reducing vibration and noise. Background Art

[0002] Modern aircraft hydraulic systems mostly use aviation plunger pumps to output pressure and flow. These pumps are the "heart" of the hydraulic system. Lightweighting, increased power density, and vibration and noise reduction are key development directions for aviation plunger pumps. Composite materials, compared to traditional metals, offer advantages such as lower density and improved vibration absorption, making them widely used in the aviation field. For example, composite materials are used in aircraft fuselages and wings, and the amount of composite materials used is a key indicator of an aircraft's advanced capabilities. Composite materials are also widely used in hydraulic systems, with products such as hydraulic cylinders and accumulators now available. However, the complex structure and function of aviation plunger pumps present significant challenges in their design and manufacturing, resulting in limited research on their application. Composite 3D printing technology provides effective technical support for the fabrication of complex composite parts. Current technology allows for the addition of continuous fibers to the base material during printing, tailored to the part's load characteristics, resulting in even stronger composite parts. The casing of an aviation plunger pump is the final destination for vibration transmission. Therefore, using composite material 3D printing technology to design and manufacture composite material aviation plunger pump housings is an effective way to achieve lightweight aviation plunger pumps, increase power density, and reduce vibration and noise. Summary of the Invention

[0003] The purpose of the present invention is to provide an aviation plunger pump with a composite material housing having a wide temperature range and vibration and noise reduction, in response to the current situation that existing aviation plunger pumps are insufficiently lightweight, have a power density that needs to be improved, have large vibrations, and are noisy, so as to improve the lightweighting, power density, and vibration and noise reduction of the aviation plunger pump.

[0004] The present invention solves the above-mentioned technical problems by:

[0005] An aviation plunger pump with a composite housing that reduces vibration and noise over a wide temperature range includes an intermediate housing and an oil suction port end cap, both manufactured using composite 3D printing technology. Composite materials have advantages such as low density and ease of vibration absorption. Using composite 3D printing to manufacture the intermediate housing and oil suction port end cap composite components effectively reduces the weight of the aircraft plunger pump and increases its power density. The aviation plunger pump housing is the endpoint of vibration transmission for the pump. The inclusion of composite intermediate housing and oil suction port end cap composite components within the pump housing effectively reduces surface vibration and noise. The selected matrix materials are PEKK, a thermoplastic special engineering plastic that can withstand both high and low temperatures, and chopped carbon fiber. These materials effectively avoid the weaknesses of aluminum alloys, such as softening and failure under high-temperature conditions, and can accommodate the wide temperature range of the aviation plunger pump. Continuous fiber can be added to the matrix material during printing based on the stress conditions of the part, resulting in a lightweight, high-strength composite component.

[0006] The outstanding effect of the present invention is that the composite aviation plunger pump housing proposed in the present invention is manufactured using composite 3D printing technology, and the matrix material is selected from thermoplastic special engineering plastics PEKK and chopped carbon fibers that are resistant to high temperatures up to 250°C and have strong adaptability to low temperatures. On the basis of printing the matrix material, continuous carbon fibers can be further added according to the stress characteristics of the parts, thereby obtaining composite parts with higher strength. Compared with traditional aluminum alloy shells, the composite shell of the present invention is more than 40% lighter and can withstand high temperatures of 250°C. In addition, the matrix material containing PEKK has a lower thermal expansion coefficient and can work stably for a long time at the temperature at which aluminum alloy softens (above 200°C), and maintain excellent creep resistance and dimensional stability. Compared with aviation plunger pumps that do not use composite shells, the aviation plunger pump using a composite shell in the present invention can effectively reduce the vibration transmitted to the shell and generate less noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of the present invention;

[0008] Figure 2 It is a schematic diagram of the intermediate housing part of the present invention;

[0009] Figure 3 The intermediate housing part of the present invention is vertical z Schematic diagram of matrix material and continuous carbon fiber arrangement in cross section in 1 direction;

[0010] Figure 4 A partial diagram of the composite material of the oil suction port end cover of the present invention;

[0011] Figure 5 The vertical structure of the composite material part of the oil suction port end cover of the present invention zSchematic diagram of the matrix material and continuous carbon fiber arrangement in a 2-direction cross-section.

[0012] In the figure: 1. Main shaft; 2. Mounting seat; 3. Intermediate housing; 4. Oil distributor cover; 5. Composite material part of oil suction port end cover; 6. Aluminum alloy part of oil suction port end cover; 7. Distribution plate; 8. Cylinder block; 9. Plunger shoe assembly; 10. Swash plate. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0014] Example 1:

[0015] like Figure 1 As shown, a wide temperature range vibration and noise reduction composite material housing aviation plunger pump includes a main shaft 1, a mounting seat 2, an intermediate housing 3, an oil separator cover 4, an oil suction port end cover composite material part 5, an oil suction port end cover aluminum alloy part 6, a distribution plate 7, a cylinder body 8, a plunger slipper assembly 9, and a swash plate 10.

[0016] The intermediate shell 3 and the oil suction port end cover composite material part 5 are manufactured using composite material 3D printing technology. The matrix material is selected from thermoplastic special engineering plastic PEKK that can withstand high and low temperatures and short-cut carbon fiber. On the basis of printing the matrix material, continuous carbon fiber can be further added according to the stress characteristics of the part to obtain a composite material part with higher strength.

[0017] like Figure 2 The figure shows the intermediate housing components. The intermediate housing 3 is connected to the mounting base 2, the oil distributor cap 4, and the composite material portion 5 of the oil intake end cap via bolts and nuts. When designing the connection, the threaded holes on both sides were replaced with bare holes to effectively prevent failure of the composite components due to thread pullout.

[0018] like Figure 3 The figure shows the cross-section matrix material and continuous carbon fiber arrangement of the intermediate shell part. The arrangement direction of the continuous carbon fiber is the two main stress directions of the intermediate shell. x 1 and y 1, along which x 1 is subjected to the greatest force. The hydraulic pressure of the plunger and sliding shoe assembly 9 and the force of the variable mechanism and other components are transmitted to the swash plate 10, and the force is applied to the mounting seat 2 through the bearings on both sides of the swash plate 10, and then transmitted to the intermediate housing 3 through the bolts. y The force in direction 1 is the lateral force caused by the inclination of the swash plate, which is transmitted from the bearing to the mounting seat 2 and the oil distributor 4, and then to the intermediate housing 3 through the bolts. Therefore, in this embodiment, the direction with the least force on the intermediate housing is selected. z 1 As the printing direction, the two directions with greater force x 1 and y1 is the direction of continuous carbon fiber laying.

[0019] like Figure 4 The diagram shows the composite material portion of the oil intake cover. The composite material portion 5 and the aluminum alloy portion 6 are positioned together using three locating pins. The composite material portion 5 is connected to the intermediate housing 3 via bolts and nuts, along with the oil distributor cap 4. The aluminum alloy portion 6 is threadedly connected to the oil intake pipe joint, effectively joining the composite material portion 5 and the aluminum alloy portion 6 together.

[0020] like Figure 5 The figure shows the cross-section matrix material and continuous carbon fiber arrangement of the composite material part of the oil suction end cover. The main source of force on the composite material part 5 of the oil suction end cover is the force transmitted by the bolts. x The axial force in the two directions and the lower oil pressure in the oil inlet cover. In this embodiment, the continuous carbon fibers are arranged in x 2 and y 2 Direction, the printing direction is selected as z 2 directions.

[0021] The mounting base 2, intermediate housing 3, oil distributor cap 4, composite material portion of the oil suction port cover 5, and aluminum alloy portion of the oil suction port cover 6 are axially connected by bolts, nuts, or threads to form the housing of the aviation plunger pump. Key components that assist the aviation plunger pump in completing its oil suction and discharge functions, such as the main shaft 1, port plate 7, cylinder block 8, plunger shoe assembly 9, and swash plate 10, are all installed within the housing.

[0022] The intermediate housing 3 and the composite material portion 5 of the oil suction port cover are important components of the aviation plunger pump housing. The aviation plunger pump housing is the endpoint of the aircraft plunger pump's vibration transmission. The inclusion of the composite material portion 5 of the intermediate housing 3 and the oil suction port cover can effectively reduce surface vibration and noise generated by the aircraft plunger pump.

[0023] The main shaft 1 is mounted inside the aviation plunger pump housing via bearings at both ends and is connected to the cylinder block 8 via splines. The plunger surface of the plunger shoe assembly 9 mates with the interior of the cylinder bore of the cylinder block 8, and the bottom surface of one side of the shoe mates with the surface of the swash plate 10. The shoe and the plunger are connected via a ball pair. The inclination angle of the swash plate 10 is adjusted by a variable mechanism integrated into the aviation plunger pump. During operation of the aviation plunger pump, the main shaft 1 is rotated by an engine or motor, driving the rotation of the cylinder block 8, thereby causing the shoe to slide on the swash plate. The plunger then performs a combined rotational and reciprocating motion within the cylinder bore of the cylinder block 8, completing the oil suction and discharge functions of the aviation plunger pump.

[0024] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field can make various changes without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention.

Claims

1. A wide temperature range vibration and noise reduction composite material housing aviation plunger pump, characterized by: include: A mounting seat (2), wherein the mounting seat (2), the intermediate housing (3), the oil separator cover (4), the composite material portion (5) of the oil suction port end cover, and the aluminum alloy portion (6) of the oil suction port end cover are axially connected together to form a housing of the aviation plunger pump; The intermediate shell (3) and the oil suction port end cover composite material portion (5) are both made of composite materials that can withstand high and low temperatures; The intermediate housing (3) and the oil suction port end cover composite material portion (3) are manufactured using composite material 3D printing technology; The intermediate shell (3) part includes a matrix material and a continuous carbon fiber arrangement, and the continuous carbon fiber arrangement direction is the two directions x1 and y1 where the intermediate shell (3) is subjected to greater force; The x1 direction is the direction in which the hydraulic pressure of the plunger shoe assembly (9) and the force of the variable mechanism are transmitted to the swash plate (10), and the force is applied to the mounting seat (2) through the bearings on both sides of the swash plate (10), and is transmitted to the intermediate housing (3) through the bolts; The y1 direction is the direction of the lateral force caused by the inclination of the swash plate, which is transmitted from the bearing to the mounting seat (2) and the oil distributor cover (4), and then transmitted to the intermediate housing (3) through the bolts; The direction z1 where the intermediate shell (3) is subjected to the least force is used as the printing direction; The main shaft (1) is mounted inside the housing of the aviation plunger pump via bearings at both ends and is connected to the cylinder body (8) via splines; A plunger shoe assembly (9), wherein the plunger surface matches the interior of the cylinder bore of the cylinder body (8), the bottom surface of one side of the shoe matches the surface of the swash plate (10), and the shoe and the plunger are connected via a ball pair; A swash plate (10) is mounted on the mounting seat (2) via two bearings, wherein the inclination angle of the swash plate (10) is adjusted by a variable mechanism integrated inside the aviation plunger pump; A distribution plate (7) is connected to the oil distribution cover (4) and the high-pressure and low-pressure oil ports of the hydraulic system; During operation, the main shaft (1) drives the cylinder body (8) to rotate, forcing the plunger shoe assembly (9) to perform a composite motion of rotation and reciprocation on the swash plate (10), thereby completing the oil suction and discharge functions of the aviation plunger pump.

2. The wide temperature range vibration and noise reduction composite material housing aviation plunger pump according to claim 1, characterized in that: The matrix material of the intermediate shell (3) and the oil suction port end cover composite material part (5) is a mixture of thermoplastic special engineering plastic PEKK that can withstand high and low temperatures and short-cut carbon fibers.

3. The wide-temperature-range vibration-damping and noise-reducing composite material housing aviation plunger pump according to claim 1, characterized in that: The holes for connection on both sides of the composite material intermediate shell (3) are light holes, and the holes for connecting the composite material part (5) of the oil suction port end cover and the oil separation cover (4) are light holes.

4. The wide-temperature-range vibration-damping and noise-reducing composite material housing aviation plunger pump according to claim 3, characterized in that: The intermediate housing (3) is connected to the mounting seat (2), the oil separation cover (4) and the composite material portion (5) of the oil suction port end cover by means of bolts and nuts.

5. The wide-temperature-range vibration-damping and noise-reducing composite material housing aviation plunger pump according to claim 3, characterized in that: Three positioning pins are provided between the composite material portion (5) of the oil suction port end cover and the aluminum alloy portion (6) of the oil suction port end cover for positioning.

6. The wide-temperature-range vibration-damping and noise-reducing composite material housing aviation plunger pump according to claim 1, characterized in that: The oil suction port end cover composite material portion (5) is connected to the oil separation cover (4) and the intermediate housing (3) via bolts and nuts.

7. The wide temperature range vibration and noise reduction composite material housing aviation plunger pump according to claim 1, characterized in that: The aluminum alloy portion (6) of the oil suction port end cover is connected to the oil suction port pipe joint via a thread.

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