Pressure pulsation attenuator with flow guide block at inlet

Abstract

The invention discloses a pressure pulsation attenuator with a flow guide block at an inlet. The pressure pulsation attenuator comprises a cylindrical inlet pipeline, the wedge-shaped flow guide block at the inlet of the pipeline, an attenuator ball cavity and a cylindrical outlet pipeline, the attenuator ball cavity is composed of an upper half cavity and a lower half cavity. One end of the cylindrical inlet pipeline is fixed on a working object hydraulic pump, and the other end of the cylindrical inlet pipeline is connected with the wedge-shaped flow guide block; the other end of the flow guide block is communicated with the attenuator ball cavity; a cylindrical outlet pipeline is arranged on the side wall of the attenuator ball cavity and forms an angle of 180 degrees with the cylindrical inlet pipeline, and the central axis of the cylindrical outlet pipeline and the central axis of the inlet pipeline are collinear; one end of the cylindrical outlet pipeline extends into one part of the attenuator ball cavity to form an inner inserting pipe, and fluid flows out from the other end. The structure is simple, the inlet and the outlet of the pressure pulsation attenuator are collinear, and the pressure pulsation attenuator can be conveniently applied to linear pipelines; the fluid divided by the wedge-shaped flow guide block well utilizes the ball cavity structure, and pulsation is reduced through certain resonance and interference; in addition, the outlet adopts the inner insertion pipe, and the attenuation effect is better.

Description

Technical Field

[0001] This invention relates to a pressure pulsation attenuator, specifically a pressure pulsation attenuator with a guide block at the inlet, belonging to the field of pressure pulsation control in hydraulic systems. Background Technology

[0002] Hydraulic systems, with their excellent power density, rapid response characteristics, and superior rigidity, play a crucial role in important fields such as aircraft and heavy engineering equipment. As the core power unit of the entire hydraulic power system, the hydraulic pump bears the important mission of converting rotating mechanical energy into high-pressure hydraulic energy; its operational efficiency and service life directly determine the overall performance of the entire hydraulic system.

[0003] Currently, commonly used hydraulic pumps mainly include three structural types: gear pumps, vane pumps, and piston pumps. These positive displacement pumps inevitably generate periodic flow fluctuations during operation. Due to the influence of system impedance characteristics, when this pulsating fluid propagates in the pipeline system, it further exacerbates significant pressure pulsations. These pressure fluctuations not only accelerate the fatigue damage process of the pipeline system and its supporting structures, shortening the service life of critical components, but also lead to a decrease in the motion accuracy of actuators, thus affecting the control performance of the entire system. The resulting high-frequency noise also poses a potential threat to the hearing health of operators. Modern hydraulic systems are constantly developing towards higher working pressures and larger flow rates, and the mechanical vibration and noise pollution problems caused by pressure pulsations are becoming increasingly prominent, which has become one of the major bottlenecks restricting the development of hydraulic technology to higher pressure levels. Therefore, how to effectively suppress pressure pulsations is a key technical issue for improving system operating quality and the working environment.

[0004] Currently, pressure pulsation control technologies used in engineering practice are mainly divided into two types: active control and passive control. Active control schemes theoretically offer better regulation performance, but require the introduction of additional sensing elements and actuators, increasing system complexity and exhibiting inherent control lag. Their practical application effectiveness still needs further verification. In contrast, passive pulsation attenuation devices designed based on fluid dynamics principles have significant advantages such as simple structure, high reliability, and convenient maintenance, leading to their wider application in industrial practice. In special application scenarios such as aviation hydraulic systems, the pressure pulsation frequency generated by the hydraulic pump changes significantly due to the adjustment of the power source speed with changes in flight conditions. This necessitates that the pulsation attenuation device possess a wider effective operating bandwidth, stronger attenuation capability, and a more compact structure, which is a direction that requires further research in the field of hydraulic technology. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention proposes a pressure pulsation attenuator with a guide block at the inlet. Similar to traditional pressure pulsation attenuators, the inlet and outlet of this invention are at 180°, meaning they are collinear, allowing for convenient arrangement in straight pipes. The wedge-shaped guide block at the attenuator inlet divides the liquid into two streams as it flows into the spherical cavity. The liquid streams reduce pulsation within the cavity through resonance and interference. Furthermore, the outlet uses an internally inserted tube, resulting in superior attenuation compared to traditional outlets. In summary, this invention features a simplified structure and achieves wideband, high-efficiency pulsation attenuation.

[0006] This invention relates to a pressure pulsation attenuator with an inlet guide block, comprising a cylindrical inlet pipe 1, an inlet wedge-shaped guide block 2, an attenuator spherical cavity 3, and a cylindrical outlet pipe 4. The attenuator spherical cavity consists of upper and lower half-cavities. One end of the cylindrical inlet pipe 1 is fixed to the hydraulic pump, the object of this invention, and the other end is connected to the wedge-shaped guide block 2, whose inclined side forms a certain angle; the other end of the guide block communicates with the attenuator spherical cavity 3; a cylindrical outlet pipe 4 is arranged on the side wall of the attenuator spherical cavity 3, collinear with the cylindrical inlet pipe 1; one end of the cylindrical outlet pipe 4 extends into a portion of the attenuator spherical cavity 3, forming an inner tube, and fluid flows out from the other end.

[0007] The cylindrical inlet pipe 1 has a diameter of d1 and a length of L1, and its central axis passes through the center of the lower half of the attenuator spherical cavity 3.

[0008] The narrow side width of the wedge-shaped guide block 2 is e, the included angle between the two inclined sides of the wedge is a, and its two ends are respectively connected to the cylindrical inlet pipe 1 and the attenuator ball cavity 3.

[0009] The attenuator spherical cavity 3 has a radius of R.

[0010] The cylindrical outlet pipe 4 has a diameter of d2 and a length of L3. The inner tube extending into the attenuator ball cavity has two rows of damping holes with different radii, r1 and r2, on its circumference. The length of the extended part of the pipe is L2, and the fluid flows out from the other end.

[0011] The beneficial effects of this invention are:

[0012] (1) The pressure pulsation attenuator of the present invention has a wedge-shaped guide block at the inlet leading to the spherical cavity. Compared with the traditional pressure pulsation attenuator with circular orifice flow, the fluid divided into two streams by the wedge-shaped guide block can flow a longer distance in the spherical cavity. By increasing the friction time between the fluid and the wall and between the fluids, viscous dissipation is generated by utilizing the inertia and compressibility of the oil, thereby making more effective use of the spherical cavity volume and effectively reducing low- and medium-frequency pressure pulsation. At the same time, the fluid diverted by the guide block flows on the wall of the spherical cavity, and the fluid flows from the periphery to the root of the insertion tube. The pulsation is reduced on the wall of the attenuator spherical cavity through certain fluid resonance and interference, which can effectively reduce low- and medium-frequency pressure pulsation.

[0013] (2) The outlet pipe of the pressure pulsation attenuator of the present invention adopts an internal insertion tube design. The internal insertion tube prevents the fluid from flowing out directly. Combined with the liquid flow formed by the inlet guide block flowing around the attenuator ball cavity, it can increase the mutual impact of the fluid and the chance of the fluid colliding and rubbing against the attenuator wall. In addition, the internal insertion tube has two rows of damping holes with different radii in the circumference. The fluid flowing from the root of the internal insertion tube converts the pulsation energy into heat energy through friction to reduce pressure pulsation. The attenuation effect is better and can effectively reduce high, medium and low frequency pressure pulsation.

[0014] (3) The present invention can further improve the attenuation effect through the design of the wedge-shaped guide block and the inner tube at the inlet. It has a good pulsation attenuation effect while simplifying the overall structure and making it easy to install. It is easy to integrate into the hydraulic pump and can better attenuate the pulsation at the pulsation source without affecting other hydraulic pipeline systems. At the same time, the internal structure formed by the guide block and the inner tube is simple, has no moving parts, is easy to process, and has high reliability. Attached Figure Description

[0015] Figure 1 This is an isometric view of the upper and lower chambers of the pressure pulsation attenuator with a flow guide block at the inlet of the present invention.

[0016] Figure 2 Figure 4 shows a top view of the upper cavity of the pressure pulsation attenuator with a flow guide block at the inlet of the present invention.

[0017] Figure 3 This is a front sectional view of the upper cavity of the pressure pulsation attenuator with a flow guide block at the inlet of the present invention.

[0018] Figure 4 This is a top view of the lower half of the pressure pulsation attenuator with a flow guide block at the inlet of the present invention.

[0019] Figure 5 This is a right sectional view of the lower half of the pressure pulsation attenuator with a flow guide block at the inlet of the present invention.

[0020] The markings in the diagram are explained below:

[0021] 1 is a cylindrical inlet pipe, 2 is a guide block, 3 is an attenuator spherical cavity, and 4 is a cylindrical outlet pipe.

[0022] L1 is the length of the cylindrical inlet pipe 1, L2 is the length of the inner tube portion of the cylindrical outlet pipe 4, L3 is the length of the cylindrical outlet pipe 4, d1 is the diameter of the cylindrical inlet pipe 1, d2 is the diameter of the cylindrical outlet pipe 4, e is the width of the narrow side of the wedge-shaped guide block, R is the radius of the attenuator spherical cavity 3, r1 is the radius of the four damping holes in the first row of the inner tube, r2 is the radius of the four damping holes in the second row of the inner tube, and a is the included angle between the two inclined surfaces of the wedge-shaped guide block. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0025] In the description of the invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. If the terms "first" and "second" are used, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] The structure of the embodiments of the present invention is as follows Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, this invention is a pressure pulsation attenuator with an inlet guide block. It includes a cylindrical inlet pipe 1, a wedge-shaped guide block 2 at the inlet, an attenuator spherical cavity 3 (composed of upper and lower half-cavities), and a cylindrical outlet pipe 4. One end of the cylindrical inlet pipe 1 is fixed to the hydraulic pump, the object of this invention, and the other end is connected to the wedge-shaped guide block connected to the wall of the spherical cavity. The other end of the guide block communicates with the attenuator spherical cavity 3. A cylindrical outlet pipe 4 is arranged on the side wall of the attenuator spherical cavity 3, collinear with the cylindrical inlet pipe 1. One end of the cylindrical outlet pipe 4 extends into a portion of the attenuator spherical cavity 3, forming an inner tube, and fluid flows out from the other end. These four parts are connected as a whole.

[0028] The cylindrical inlet pipe 1 has a diameter d1 of 11.5 mm and a length L1 of 18.5 mm. One end of the pipe is fixed to the hydraulic pump of the present invention, and the other end is connected to the wedge-shaped guide block. The central axis of the cylindrical inlet pipe 1 passes through the center of the lower half of the attenuator ball cavity 3.

[0029] The narrow side width e of the wedge-shaped guide block is 3.5mm, and the included angle a of the two inclined sides of the wedge is 30°. Its narrow side and wide side are respectively connected to the cylindrical inlet pipe 1 and the attenuator ball cavity 3.

[0030] The attenuator spherical cavity 3 has a radius R of 34.5 mm.

[0031] The cylindrical outlet pipe 4 has a diameter d2 of 10.5 mm and a length L3 of 38 mm. One end of the pipe extends into a portion of the attenuator ball cavity 3 to form an inner tube. The inner tube has two rows of damping holes with different radii around its circumference, namely r1 = 1.3 mm and r2 = 1 mm. The length L2 of the pipe extending into the outlet is 24.5 mm, and the fluid flows out from the other end.

[0032] Guided by fluid mechanics theory, this invention optimizes traditional pressure pulsation attenuators. The pressure pulsation attenuator of this invention features a wedge-shaped guide block at the inlet. The angle of its inclined surface can control the liquid flow velocity under different resistances. This allows the diverted liquid to flow towards the wall without directly scouring the wall, increasing the distance the fluid travels within the spherical cavity. This increases friction between the fluid and the cavity wall, converting pulsation energy into heat energy and more effectively utilizing the cavity volume, resulting in better attenuation. After being diverted by the guide block, the fluid flowing towards the root of the inner tube in the outlet pipe reduces pulsation at the wall of the attenuator cavity through dual resonance and interference between the fluid and the cavity wall. The outlet pipe of this invention uses an inner tube design with damping holes of radii r1 and r2 arranged circumferentially, resulting in superior attenuation compared to traditional outlets.

[0033] This invention improves pulsation attenuation through the design of a wedge-shaped guide block at the inlet and an inner tube. It achieves the same attenuation requirements with a smaller overall size, allowing integration into a hydraulic pump and direct attenuation of pulsations at the source. Furthermore, the internal structure of the guide block and inner tube is simple, with no moving parts and no external control components, making it easy to manufacture, install, and highly reliable with good timeliness. In summary, the pressure pulsation attenuator with a guide block at the inlet of this invention has significant technical advantages. Through friction and resonance between fluids and between the fluid and the cavity wall, it achieves a wide operating frequency range, good attenuation effect, and compact structure, making it valuable for engineering applications in the field of pressure pulsation control.

Claims

1. A pressure pulsation attenuator with a flow guide block at the inlet, characterized in that: The pressure pulsation attenuator includes a cylindrical inlet pipe, a wedge-shaped guide block integrated with the inlet pipe to divide the fluid flow, an attenuator spherical cavity, and a cylindrical outlet pipe. The attenuator spherical cavity consists of upper and lower half-cavities. One end of the cylindrical inlet pipe is fixed to the hydraulic pump of the working object, and the other end is connected to the inlet with the wedge-shaped guide block. The other end of the guide block is connected to the attenuator spherical cavity. A cylindrical outlet pipe is provided on the side wall of the attenuator spherical cavity at a 180° angle to the cylindrical inlet pipe. The cylindrical outlet pipe is collinear with the central axis of the guide block of the inlet pipe. One end of the cylindrical outlet pipe extends into a portion of the attenuator spherical cavity to form an inner tube, and the fluid flows out from the other end.

2. A pressure pulsation attenuator with an inlet guide block according to claim 1, characterized in that: The cylindrical inlet pipe has a diameter of d1 and a length of L1, and its central axis passes through the center of the lower half of the attenuator spherical cavity.

3. A pressure pulsation attenuator with a flow guide block at the inlet according to claim 1, characterized in that: The width of the narrow side of the wedge-shaped guide block is e, and the angle between the two inclined sides of the wedge is a.

4. A pressure pulsation attenuator with a flow guide block at the inlet according to claim 1, characterized in that: The radius of the attenuator spherical cavity is R.

5. A pressure pulsation attenuator with an inlet guide block according to claim 1, characterized in that: The cylindrical outlet pipe has a diameter of d2 and a length of L3.

6. A pressure pulsation attenuator with an inlet guide block according to claim 1, characterized in that: The cylindrical outlet pipe extends into the inner tube of the attenuator cavity, which has two rows of damping holes with different radii around its circumference. The length of the inner tube extending into the attenuator cavity is L2.

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