Fluid noise suppression device of low-noise hydraulic power unit

Abstract

The utility model discloses a fluid noise suppression device of a low-noise hydraulic power unit, and relates to the technical field of hydraulic power units. The device comprises an oil tank, one side of the oil tank is fixedly connected with a hydraulic pump, one side of the top of the oil tank is communicated with an oil inlet pipe, the other side of the top of the oil tank is provided with an oil return pipe, and the top of the oil tank is communicated with a filter assembly. Through the active real-time filtering mechanism of the filtering assembly, the electromagnetic braking bearing is utilized to accurately control the rotating wheel to drive the scraping rod, impurities on the surface of the filtering net are periodically cleaned, and turbulence and cavitation noise caused by blockage of the filtering net are avoided; compared with a traditional external filter, the device has the advantages that online cleaning can be completed without shutdown, the mute performance of a hydraulic system is remarkably improved, and the device is suitable for industrial scenes with high-precision and low-noise requirements.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic power unit technology, and in particular relates to a fluid noise suppression device for low-noise hydraulic power units. Background Technology

[0002] The hydraulic power unit is the core power supply device of a hydraulic system, typically composed of a hydraulic pump, drive motor, oil tank, control valves, and auxiliary components. It transmits power through the hydraulic medium to achieve motion control of mechanical equipment. Widely used in industrial machinery, engineering equipment, aerospace, and other fields, it features high power density and precise control. However, the fluid noise generated during operation has become a key factor restricting its performance improvement. The fluid noise of the hydraulic power unit mainly originates from turbulence, cavitation, pressure pulsation, and mechanical vibration during oil flow. Among these, impurities in the oil circuit are a significant contributing factor to noise. Metal shavings, rubber particles, and other contaminants mixed in the oil can clog narrow flow channels such as valve ports and throttle orifices, causing sudden changes in local flow velocity and generating turbulent noise. When impurities adhere to the filter screen or pipe wall, they hinder oil flow, creating local low-pressure areas that induce bubble bursts and generate cavitation noise. Impurities accelerate the wear of moving parts such as the hydraulic pump and valve core, producing metal abrasive particles that further contaminate the oil, creating a vicious cycle of noise.

[0003] Traditional solutions often employ periodic external filters for offline filtration, but these have significant drawbacks: external filters cannot remove impurities circulating within the oil circuit in real time, only passively intercepting them during maintenance cycles, leading to the continuous accumulation of impurities within the system. Existing technologies lack an active, real-time removal mechanism for oil circuit impurities, resulting in limited fluid noise suppression. To address these issues, we provide a fluid noise suppression device for low-noise hydraulic power units. Utility Model Content

[0004] The purpose of this invention is to provide a fluid noise suppression device for a low-noise hydraulic power unit. By combining the filter component and the slag discharge component, it solves the problem that the existing technology lacks an active real-time removal mechanism for oil circuit impurities, resulting in limited fluid noise suppression effect.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0006] This utility model relates to a fluid noise suppression device for a low-noise hydraulic power unit, comprising an oil tank, a hydraulic pump fixedly connected to one side of the oil tank, an oil inlet pipe connected to one side of the top of the oil tank, an oil return pipe provided on the other side of the top of the oil tank, a filter assembly connected to the top of the oil tank, the filter assembly comprising a filter pipe connected to the top of the oil tank, a limiting groove formed inside the filter pipe, a filter screen disposed inside the filter pipe, a scraper contacting the top of the filter screen, a spring fixedly connected to the top of the scraper, and a rotating wheel fixedly connected to the top of the spring, and a slag discharge assembly disposed inside the filter pipe, the slag discharge assembly comprising a funnel filter screen disposed inside the filter pipe, a slag discharge pipe connected to the bottom of the funnel filter screen, and a flushing pipe connected to the top of the slag discharge pipe.

[0007] The present invention is further configured such that the bottom of the filter tube is fixedly connected to the top of the oil tank by bolts, the top of the filter tube is threadedly connected to a pipe cap, the return oil pipe is connected to the pipe cap, and the outer diameter of the filter screen is smaller than the inner diameter of the funnel filter screen.

[0008] The present invention is further configured such that a support rod is placed inside the limiting groove, the support rod is cross-shaped, a limiting block is fixedly connected to the top of the support rod, and a limiting slot adapted to the limiting block is provided at the bottom of the filter screen.

[0009] The present invention is further configured such that a pressure rod is placed inside the limiting groove, and the rotating wheel is movably connected to the pressure rod through an electromagnetic brake bearing.

[0010] The present invention is further configured such that an extension rod is placed inside the limiting groove, and an elastic rubber is placed on the top of the funnel filter screen.

[0011] The present invention is further configured such that a locking rod is fixedly connected inside the filter tube, and the locking rod has a locking groove adapted to the funnel filter screen.

[0012] The present invention is further configured such that the slag discharge pipe is inclined, the other end of the slag discharge pipe extends to the outside of the filter pipe, and a valve is connected to the surface of the slag discharge pipe.

[0013] The present invention has the following beneficial effects.

[0014] 1. This utility model utilizes the active real-time filtration mechanism of the filter assembly, employing electromagnetic brake bearings to precisely control the rotating wheel to drive the scraper, periodically cleaning impurities on the filter screen surface. This avoids turbulence and cavitation noise caused by filter screen blockage. Simultaneously, the inclined design of the funnel filter screen and slag discharge pipe, combined with the backflushing function of the flushing pipe, achieves efficient collection and discharge of impurities, reducing secondary oil pollution. Compared to traditional external filters, this device can complete online cleaning without stopping the machine, significantly improving the quietness performance of the hydraulic system. It is suitable for industrial scenarios with high precision and low noise requirements.

[0015] 2. This utility model adopts a modular filter tube design, which is quickly connected to the oil tank with bolts. With the help of limiting grooves, support rods and clamps, the filter screen and funnel are stably installed. The elastic rubber and valve control in the slag discharge assembly effectively prevent impurities from seeping back. Combined with the electromagnetic brake bearing, the rotating wheel can be started and stopped as needed, and the rotational power is released only when slag is discharged. This closed-loop design not only extends the life of the filter screen, but also reduces the wear of the hydraulic pump by clearing impurities in the oil circuit in real time, thus comprehensively improving the system's operating efficiency and long-term stability.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 A perspective view of a fluid noise suppression device for a low-noise hydraulic power unit.

[0019] Figure 2 This is a cross-sectional view of the filter tube in the fluid noise suppression device of a low-noise hydraulic power unit.

[0020] Figure 3 This is a front view of the support rod and limit block in the fluid noise suppression device of a low-noise hydraulic power unit.

[0021] Figure 4 This is an exploded view of the filter assembly and slag discharge assembly in the fluid noise suppression device of a low-noise hydraulic power unit.

[0022] In the attached diagram: 1. Oil tank; 2. Hydraulic pump; 3. Oil inlet pipe; 4. Oil return pipe; 5. Filter pipe; 6. Limiting groove; 7. Filter screen; 8. Scraper rod; 9. Spring; 10. Rotating wheel; 11. Funnel filter screen; 12. Slag discharge pipe; 13. Flushing pipe; 14. Pipe cover; 15. Support rod; 16. Limiting block; 17. Pressure rod; 18. Extension rod; 19. Elastic rubber; 20. Clamping rod; 21. Valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1

[0025] Please see Figures 1-4This utility model is a fluid noise suppression device for a low-noise hydraulic power unit, including an oil tank 1, a hydraulic pump 2 fixedly connected to one side of the oil tank 1, an oil inlet pipe 3 connected to one side of the top of the oil tank 1, a return oil pipe 4 provided on the other side of the top of the oil tank 1, and a filter assembly connected to the top of the oil tank 1. The filter assembly includes a filter pipe 5 connected to the top of the oil tank 1, a limiting groove 6 opened inside the filter pipe 5, a filter screen 7 disposed inside the filter pipe 5, a scraper 8 contacting the top of the filter screen 7, a spring 9 fixedly connected to the top of the scraper 8, and a rotating wheel 10 fixedly connected to the top of the spring 9. The fluid noise is transmitted through the filter assembly. The filter tube 5 has a filter screen 7 inside that intercepts contaminants such as metal shavings and rubber particles in the oil, preventing impurities from entering the hydraulic pump 2 and the main oil circuit, and reducing turbulence noise and cavitation noise caused by impurities. The filter tube 5 is equipped with a slag discharge assembly, which includes a funnel filter screen 11 inside the filter tube 5, a slag discharge pipe 12 connected to the bottom of the funnel filter screen 11, and a flushing pipe 13 connected to the top of the slag discharge pipe 12. With the slag discharge assembly, the funnel filter screen 11 is located below the filter screen 7, collects the impurities scraped off by the scraper 8, and guides them to the outside through the inclined slag discharge pipe 12.

[0026] Example 2

[0027] Please see Figures 1-4Based on Example 1, the bottom of the filter tube 5 is fixedly connected to the top of the oil tank 1 by bolts. A pipe cap 14 is threaded onto the top of the filter tube 5, and the return oil pipe 4 communicates with the pipe cap 14. The outer diameter of the filter screen 7 is smaller than the inner diameter of the funnel filter screen 11. The pipe cap 14 is used to seal the top of the filter tube 5. The smaller diameter filter screen 7 allows the filtered impurities to fall into the funnel filter screen 11 after being scraped off by the scraper 8. A support rod 15 is placed inside the limiting groove 6. The support rod 15 is cross-shaped, and a limiting block 16 is fixedly connected to the top of the support rod 15. The bottom of the filter screen 7 has a limiting slot that matches the limiting block 16. The support rod 15 supports the filter screen 7, and the limiting block 16 and the limiting slot limit the position of the filter screen 7. A pressure rod 17 is placed inside the limiting groove 6. The rotating wheel 10 is movably connected to the pressure rod 17 via an electromagnetic brake bearing. The pressure rod 17 is located at the top of the support rod 15 and supports the rotating wheel 10, allowing it to rotate smoothly. The electromagnetic brake bearing works by using a built-in electromagnetic brake that... Spring force or permanent magnet force presses the friction plate, locking the rotating wheel 10 and the pressure rod 17, preventing rotation. The electromagnetic coil is energized to generate a reverse magnetic force, counteracting the spring 9 / permanent magnet force, releasing the friction plate, allowing the rotating wheel 10 to rotate freely. Therefore, the timing of the rotating wheel 10's rotation can be controlled. The rotating wheel 10 rotates when slag discharge is required. An extension rod 18 is placed inside the limiting groove 6, and an elastic rubber 19 is placed on top of the funnel filter screen 11. The extension rod 18 is located on top of the pressure rod 17. The extension rod 18 is used to fix the support rod 15 and the pressure rod 17 during installation. The 19 setting is used to limit the top of the funnel filter screen 11 during installation and prevent excessive compression of the funnel filter screen 11. A clamping rod 20 is fixedly connected inside the filter tube 5. The clamping rod 20 has a locking groove that matches the funnel filter screen 11. The clamping rod 20 and the locking groove are used to limit and support the funnel filter screen 11. The slag discharge pipe 12 is designed with an inclination. The other end of the slag discharge pipe 12 extends to the outside of the filter tube 5. A valve 21 is connected to the surface of the slag discharge pipe 12. The valve 21 is used to periodically discharge impurities from the slag discharge pipe 12 by opening and closing the valve 21.

[0028] The working principle of this utility model is as follows: The bottom of the filter tube 5 is connected to the oil tank 1. The funnel filter screen 11, elastic rubber 19, support rod 15, filter screen 7, pressure rod 17 and extension rod 18 are placed into the inside of the filter tube 5 in sequence. It should be noted that the support rod 15, pressure rod 17 and extension rod 18 are all placed in the limiting groove 6. Then the tube cap 14 is screwed on the top of the filter tube 5. During the tightening of the tube cap 14, the tube cap 14 presses down on the extension rod 18, the extension rod 18 presses down on the pressure rod 17, and the pressure rod 17 presses down on the support rod 15. When the tube cap 14 is tightened, the filter assembly is installed. The return oil pipe 4 is connected to the tube cap 14.

[0029] During the use of the hydraulic power unit, the used hydraulic oil circulates through the return oil pipe 4 to the filter pipe 5. The hydraulic oil undergoes a first filtration through the filter screen 7 to remove coarse particles. The funnel filter screen 11 performs a second filtration on the hydraulic oil, and the filtered impurities slide into the slag discharge pipe 12. The filtered impurities are periodically discharged outward. At this time, the electromagnetic brake bearing is energized, releasing the rotating wheel 10. The hydraulic oil drives the rotating wheel 10 to rotate. During the rotation, the scraper 8 scrapes off the impurities on the top of the filter screen 7. The scraped impurities fall into the funnel filter screen 11 and slide through the funnel filter screen 11 into the slag discharge pipe 12. Then, the valve 21 is opened to discharge the impurities in the slag discharge pipe 12 outward. During the discharge process, hydraulic oil can be injected through the flushing pipe 13 to assist in flushing out the impurities. It should be noted that a small amount of hydraulic oil will be discharged along with the slag during the discharge process, so it is necessary to replenish the hydraulic oil periodically through the oil inlet pipe 3 in small amounts.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Fluid noise suppression device for a low-noise hydraulic power unit comprising a tank (1), characterized in that: The oil tank (1) is fixedly connected with a hydraulic pump (2) on one side, an oil inlet pipe (3) is communicated with the top of the oil tank (1) on one side, and an oil return pipe (4) is arranged on the other side of the top of the oil tank (1); The oil tank (1) is communicated with a filter assembly on the top, the filter assembly comprises a filter pipe (5) communicated with the top of the oil tank (1), a limiting groove (6) formed in the inside of the filter pipe (5), a filter screen (7) arranged in the inside of the filter pipe (5), a scraping rod (8) in contact with the top of the filter screen (7), a spring (9) fixedly connected with the top of the scraping rod (8), and a rotating wheel (10) fixedly connected with the top of the spring (9). The filter pipe (5) is provided with a residue discharging assembly in the inside, the residue discharging assembly comprises a funnel filter screen (11) arranged in the inside of the filter pipe (5), a residue discharging pipe (12) communicated with the bottom of the funnel filter screen (11), and a flushing pipe (13) communicated with the top of the residue discharging pipe (12).

2. The fluid-borne noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: The bottom of the filter pipe (5) is fixedly connected with the top of the oil tank (1) through bolts, a pipe cover (14) is threadedly connected with the top of the filter pipe (5), the oil return pipe (4) is communicated with the pipe cover (14), and the outer diameter of the filter screen (7) is smaller than the inner diameter of the funnel filter screen (11).

3. The fluid-borne noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: A supporting rod (15) is placed in the limiting groove (6), the supporting rod (15) is in the shape of a cross, a limiting block (16) is fixedly connected with the top of the supporting rod (15), and a limiting slot compatible with the limiting block (16) is formed in the bottom of the filter screen (7).

4. The fluid-borne noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: A pressing rod (17) is placed in the limiting groove (6), and the rotating wheel (10) is movably connected with the pressing rod (17) through an electromagnetic brake bearing.

5. The fluid noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: An extension rod (18) is placed in the limiting groove (6), and an elastic rubber (19) is placed on the top of the funnel filter screen (11).

6. The fluid noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: A clamping rod (20) is fixedly connected in the inside of the filter pipe (5), and a clamping groove compatible with the funnel filter screen (11) is formed in the inside of the clamping rod (20).

7. The fluid noise suppression apparatus of a low noise hydraulic power unit according to claim 1, characterized by: The residue discharging pipe (12) is designed to be inclined, the other end of the residue discharging pipe (12) extends to the outside of the filter pipe (5), and a valve (21) is communicated with the surface of the residue discharging pipe (12).

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