CN212106229U

CN212106229U - Silencing and noise reducing device for hydraulic pump

Info

Publication number: CN212106229U
Application number: CN202020469633.8U
Authority: CN
Inventors: 金鹏; 欧涛; 达强; 宋卫华; 李海; 李静; 肖晓; 郭兴万; 朱成林; 李兴宇
Original assignee: Chalco Guizhou Industrial Services Co ltd
Current assignee: Guizhou Aluminum Factory Co.,Ltd.
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-12-08
Anticipated expiration: 2030-04-02

Abstract

The utility model discloses a device of making an uproar falls in hydraulic pump amortization. The inner box comprises an upper outer box (1), wherein the upper outer box (1) and a lower outer box (6) are connected into a whole to form the outer box, an upper inner box (4) and a lower inner box (5) are respectively arranged in the upper outer box (1) and the lower outer box (6), and the upper inner box (4) and the lower inner box (5) are connected into a whole to form the inner box; the box wall of interior box on distribute and have the bloop, still fill between interior box and outer box and inhale the sound cotton, interior vertical the inlaying of inhaling sound cotton between inside and outside box lateral wall has sinusoidal acoustical panel (2). The utility model discloses simple structure can effectively keep apart the noise that the hydraulic pump produced, avoids it to cause noise pollution to the surrounding environment.

Description

Silencing and noise reducing device for hydraulic pump

Technical Field

The utility model relates to an amortization structure among the hydraulic system, especially a device of making an uproar falls in hydraulic pump amortization.

Background

The hydraulic pump is a power element of a hydraulic system, and is an element which is driven by an engine or an electric motor, sucks oil from a hydraulic oil tank, forms pressure oil, discharges the pressure oil and sends the pressure oil to an execution element. The hydraulic pump is divided into a gear pump, a plunger pump, a vane pump and a screw pump according to the structure. In actual operation, the hydraulic pump in an operating state generates noise that cannot be eliminated due to various factors. In many applications, noise pollution is caused to the surrounding environment. Therefore, there is a need for a device that effectively isolates noise.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device of making an uproar falls in hydraulic pump amortization. The utility model discloses simple structure can effectively keep apart the noise that the hydraulic pump produced, avoids it to cause noise pollution to the surrounding environment.

The technical scheme of the utility model: a hydraulic pump noise reduction device comprises an upper outer box, wherein the upper outer box and a lower outer box are connected into a whole to form the outer box; the box wall of interior box on distribute and have the bloop, it has the sound cotton of inhaling still to fill between interior box and outer box, the cotton vertical embedded sinusoidal acoustical panel that has of inhaling of sound between interior, outer box lateral wall.

In the hydraulic pump noise reduction device, the horizontal noise reduction plate is arranged between the upper outer box and the upper box wall of the upper inner box in parallel.

In the hydraulic pump silencing and noise reducing device, the wall thickness of the inner box is 0.5-2 mm; the aperture of the silencing hole is smaller than the wall thickness of the inner box and smaller than 1 mm.

In the hydraulic pump silencing and noise reducing device, the hole center distance between the silencing holes is 5-8 times of the hole diameter of the silencing holes.

In the above-mentioned hydraulic pump noise reduction device, the distance between the inner box and the outer box is 10-24 mm.

Advantageous effects

Compared with the prior art, the utility model has the advantages that the sound-absorbing holes are distributed on the box wall of the inner box, the sound-absorbing cotton is filled between the inner box and the outer box, and the sinusoidal sound-absorbing plate is vertically embedded in the sound-absorbing cotton between the side walls of the inner box and the outer box; the structure ensures that the sound waves are transmitted from the inner box to generate friction loss when passing through the sound absorption holes, and then are subjected to diffuse reflection by the sinusoidal sound absorption plate and finally absorbed by the sound absorption cotton; with this structure, noise generated by the hydraulic pump in the inner box can be effectively isolated.

The utility model discloses still set up horizontal acoustical panel at last inside and outside box between the box wall parallelly, this structure can reflect back again to the sound wave of top propagation, again by sinusoidal acoustical panel diffuse reflection, is absorbed by the amortization cotton at last, and this structure can further improve the noise cancelling effect.

The utility model sets the wall thickness of the inner box to be 0.5-2 mm; the aperture of the silencing hole is smaller than the wall thickness of the inner box and smaller than 1 mm; the structure, make the inner box wall form the micropore on the surface, and make the inner box wall form the microperforated plate structure; the micro-perforated plate structure can improve a sound absorption system, because the energy loss of sound waves depends on the friction loss of air in the micropores when the sound waves are transmitted, the friction loss depends on the size of the sound resistance of the sound absorption structure, the larger the sound resistance is, the larger the friction loss is, and the sound resistance is inversely proportional to the square of the aperture; since the pore diameter of the micro-pores has been reduced to less than 1mm, the acoustic resistance thereof is greatly increased as compared with a general perforated plate (several millimeters to ten and several millimeters), thereby improving the sound absorption system.

The utility model makes the hole center distance between the silencing holes 5-8 times of the hole diameter of the silencing holes; the structure can reduce the porosity, and further reduce the width of a sound absorption frequency band. The low porosity can increase the width of the sound absorption band because the width of the sound absorption band depends on the ratio of the acoustic resistance to the acoustic mass, and the larger the ratio, the wider the sound absorption band. If the acoustic resistance can be increased and the acoustic mass is reduced, the ratio is larger, the acoustic mass is only related to the porosity, and the reduction of the porosity can increase the width of a sound absorption frequency band; the hole center distance of the sound absorption structure of the micro-perforated plate is 5-8 times of the aperture of the sound absorption hole, the porosity is reduced to 4% -15% compared with the corresponding porosity, and compared with a common perforated plate (the porosity is 20% -30%), the porosity is greatly reduced, so that the sound absorption frequency band is correspondingly widened.

The utility model sets the distance between the inner box and the outer box to be 10-24 mm; the structure can improve the position of a resonance sound absorption peak. The sound-absorbing structure has one or more resonance frequencies, and the height of the resonance frequency, namely the position of the maximum sound absorption peak, can be controlled by the depth of the corresponding cavity. The greater the depth, the lower the resonant frequency. In the resonant frequency, if the acoustic resistance of the perforated plate is equal to that of the air, the incident sound energy is completely absorbed by the sound absorption mechanism of the micro-perforated plate, and the maximum absorption is reached, otherwise, the incident sound energy is only partially absorbed. To further improve broadband sound absorption systems. Two or more resonant frequencies can be designed, i.e. a sound absorbing structure with two or more layers of microperforated panels is used. Therefore, the position of the resonance sound absorption peak can be effectively controlled by controlling the distance between the inner box and the outer box, and the sound absorption effect is improved.

The utility model discloses still pack porous sound absorbing material (inhale the sound cotton promptly) in intermediate layer space (the cavity that forms between the outer box wall inside and outside) and utilize its hindering nature noise elimination function, carry out multiple sound of inhaling to the noise.

To sum up, the utility model is not only simple in structure, the noise that the hydraulic pump produced can effectively be kept apart moreover, avoids it to cause noise pollution to the surrounding environment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figures are: 1-upper outer box, 2-sine acoustical panel, 3-horizontal acoustical panel, 4-upper inner box, 5-lower inner box, and 6-lower outer box.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Example 1. A hydraulic pump noise reduction device is shown in figure 1, and comprises an upper outer box 1, wherein the upper outer box 1 and a lower outer box 6 are connected into a whole to form the outer box, an upper inner box 4 and a lower inner box 5 are respectively arranged in the upper outer box 1 and the lower outer box 6, and the upper inner box 4 and the lower inner box 5 are connected into a whole to form the inner box; the box wall of interior box on distribute and have the bloop, it has the sound cotton of inhaling still to fill between interior box and outer box, the cotton vertical embedded sinusoidal noise reduction board 2 of inhaling of sound between interior, outer box lateral wall.

During the use, install the hydraulic pump in box 5 in down earlier, again with go up outer box 1 and last interior box 4 detain under on outer box 6, make go up outer box 1 and outer box 6 aligns down, go up interior box 4 and align with box 5 in down, later use the bolt with go up, down outer box 1 fixed can.

The horizontal sound-absorbing plate 3 is arranged between the upper outer box 1 and the upper box wall of the upper inner box 4 in parallel.

The wall thickness of the inner box is 0.5-2 mm; the aperture of the silencing hole is smaller than the wall thickness of the inner box and smaller than 1 mm.

The distance between the centers of the holes between the silencing holes is 5-8 times of the aperture of the silencing holes.

The distance between the inner box and the outer box is 10-24 mm.

Claims

1. A hydraulic pump noise reduction device comprises an upper outer box (1), wherein the upper outer box (1) and a lower outer box (6) are connected into a whole to form the outer box, an upper inner box (4) and a lower inner box (5) are respectively arranged in the upper outer box (1) and the lower outer box (6), and the upper inner box (4) and the lower inner box (5) are connected into a whole to form the inner box; the box wall of interior box on distribute and have the bloop, still fill between interior box and outer box and inhale the sound cotton, interior vertical the inlaying of inhaling sound cotton between inside and outside box lateral wall has sinusoidal acoustical panel (2).

2. The hydraulic pump noise dampening and reduction device of claim 1, wherein: and a horizontal sound-absorbing plate (3) is arranged between the upper outer box (1) and the upper box wall of the upper inner box (4) in parallel.

3. The hydraulic pump noise dampening and reduction device of claim 1, wherein: the wall thickness of the inner box is 0.5-2 mm; the aperture of the silencing hole is smaller than the wall thickness of the inner box and smaller than 1 mm.

4. The hydraulic pump noise dampening and reduction device of claim 1, wherein: the hole center distance between the silencing holes is 5-8 times of the hole diameter of the silencing holes.

5. The hydraulic pump noise dampening and reduction device of claim 1, wherein: the distance between the inner box and the outer box is 10-24 mm.