CN110821813A

CN110821813A - Super-silent hydraulic motor pump shell

Info

Publication number: CN110821813A
Application number: CN201911151769.2A
Authority: CN
Inventors: 冀宏; 刘新强; 孙飞; 张贺; 陈乾鹏; 高文科; 李娜娜
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-21

Abstract

A super-silent hydraulic motor pump shell is characterized in that a front cover (6) and a rear cover (13) are fastened with a shell (1) through screws (4 and 15), a base (10) and the shell (1) are of an integral structure, and a hydraulic motor pump (12) is embedded in the shell (1) through rib plates (1 b, 1c, 1d and 1 e) on the shell (1); an oil inlet (2), a vacuumization port (16), a motor lead (17) and a vacuum meter (18) are formed in the shell (1); a first boss (7) and an oil outlet (9) are formed in the front cover (6), a second boss (11) is formed in the rear cover (13), and the first boss (7) and the second boss (11) are respectively contacted with the front end and the rear end of a hydraulic motor pump (12); the oil-saving oil pump is characterized in that the shell (1) and the front cover (6) are sealed through an O-shaped ring (5), the shell (1) and the rear cover (13) are sealed through an O-shaped ring (14), an O-shaped sealing ring (3) is arranged at the oil inlet (2), and a fourth sealing ring (8) is arranged at the oil outlet (9).

Description

Super-silent hydraulic motor pump shell

Technical Field

The invention relates to a hydraulic element noise reduction technology, in particular to an ultra-silent hydraulic motor pump shell.

Background

The hydraulic component and the system belong to high-load heavy-load mechanical energy equipment, and along with the high pressure, high speed and large capacity of the hydraulic technology, the noise of the hydraulic component and the device thereof is more and more serious. Where the hydraulic pump is one of the major noise sources. The noise generated by the hydraulic components and their devices is highly ergonomic and not acceptable for particular applications. The hydraulic motor pump is a novel hydraulic power unit integrating a motor, a centrifugal booster pump, a hydraulic pump and the like. Compared with the traditional motor-hydraulic pump set, the hydraulic motor pump has high integration level, high efficiency and low noise, but in some occasions with stricter requirements on noise, a scheme and a technology for further reducing noise are required to be searched.

The noise generated by the hydraulic motor pump is classified into fluid noise and mechanical noise. The fluid noise is mainly caused by cavitation, vortex flow and pressure impact inside the hydraulic pump, while the mechanical noise is mainly caused by friction due to manufacturing error and poor use condition of an internal bearing, and mechanical collision noise such as impact between a vane and an inner curve of a stator in the vane pump. The noise measurement is not only unfavorable for hydraulic motor pump performance, and has serious threat to staff's health, consequently, further reduces the noise of hydraulic motor pump and has the significance.

The prior published patent is searched to find that the research on the low noise of the hydraulic motor pump is as follows: (1) "noise measurement and analysis of hydraulic motor vane pump prototype [ J ]" (wanngrong, jihong, huqihui, wangsen. hydraulic and pneumatic, 2010(09): 63-65.) compared with the noise of the motor oil pump group of the same power, the noise of the motor pump was reduced by 7 dB. Meanwhile, tests show that negative pressure is caused by the narrow flow passage in the shell of the motor vane pump prototype, so that a large amount of bubbles appear at the oil suction port of the pump core, and large cavitation noise is caused. (2) "a low noise integrated servo motor screw pump's experimental study [ J ]" (Sun Dongning, Liu Jixiang, von Wei, He Jun, Zhang Yu Qiang-Gansu science newspaper, 2018,30(05):119 hai 122+ 128), found through experimental study that the noise of servo motor screw pump is along with the increase of motor speed, the noise level is in rising trend; as the load pressure increases, the noise also shows an upward trend. (3) "high-pressure low-noise servomotor pump research [ J ]" (Sun Dongning, Liu Xiang, He Jun, Von Wei, Huxiao Fei. Hydraulic and pneumatic, 2018(06): 59-65.) "based on a pair of output shaft servomotors, through drive controller control servomotor rotation direction and rotational speed, eliminated mechanical noise and fluid noise that cause because of the control valve, in addition, the screw pump that adopts itself has the low-noise characteristics.

The research on the low noise of the hydraulic motor pump provides a useful reference for further ultra-silence of the hydraulic motor pump, but has the following defects:

1. the control of the noise source of the hydraulic motor pump is mostly based on the analysis of internal fluid noise and mechanical noise, corresponding noise reduction measure research is carried out, the noise reduction difficulty is large, and the effect is not ideal;

2. the technology for performing ultra-silence on the hydraulic motor pump based on the acoustic principle is less, and the basic principle that sound waves cannot be transmitted in vacuum and the noise reduction scheme for blocking the sound wave transmission are neglected.

Disclosure of Invention

The invention aims to provide an ultra-silent hydraulic motor pump shell, which utilizes the vacuum of a closed cavity formed by a shell and front and rear covers, the silencing effect of wedge inside the shell and the heat generation caused by the friction in polyethylene long chain molecules to block the transmission of the noise of a hydraulic motor pump and reduce the health hazard to workers, and provides the ultra-silent hydraulic motor pump to solve the problems in the background technology.

The invention relates to an ultra-silent hydraulic motor pump shell which comprises a shell 1, a front cover 6, a rear cover 13 and a base 10, wherein the front cover 6 and the rear cover 13 are respectively fastened with the shell 1 through a first screw 4 and a second screw 15, the base 10 and the shell 1 are of an integral structure, and a hydraulic motor pump 12 is embedded in the shell 1 through a first rib plate 1b, a second rib plate 1c, a third rib plate 1d and a fourth rib plate 1e on the shell 1; an oil inlet 2, a vacuumization port 16, a motor lead 17 and a vacuum gauge 18 are formed in the shell 1; a first boss 7 and an oil outlet 9 are formed in the front cover 6, a second boss 11 is formed in the rear cover 13, and the first boss 7 and the second boss 11 are respectively contacted with the front end and the rear end of a hydraulic motor pump 12; the shell 1 and the front cover 6 are sealed through a first O-shaped ring 5, the shell 1 and the rear cover 13 are sealed through a second O-shaped ring 14, a third O-shaped sealing ring 3 is arranged at the oil inlet 2, and a fourth sealing ring 8 is arranged at the oil outlet 9; the shell 1, the front cover 6, the rear cover 13, the first O-shaped sealing ring 5, the second O-shaped sealing ring 14, the third O-shaped sealing ring 3 and the fourth O-shaped sealing ring 8 form a closed vacuum cavity through a vacuum opening 16.

Compared with the background technology, the invention has the beneficial effects that: a closed containing cavity is formed among the shell, the front cover and the rear cover, a vacuum degree with a certain degree is formed in the closed containing cavity through the vacuum opening, and the propagation of most of mechanical noise and fluid noise inside the hydraulic motor pump is blocked by utilizing the basic principle that sound waves cannot be propagated in vacuum. The inside of the shell is provided with wedges which can geometrically attenuate the residual sound wave and further reduce the sound intensity. In addition, the shell, the front cover, the rear cover and the wedge are all made of polyethylene, internal friction heat generation is generated by utilizing the change of the shape of long-chain molecules of the polyethylene, the phase difference between sound pressure and vibration speed is caused, and the residual sound energy is further absorbed to prevent sound waves from being transmitted. This patent can't use multipurposely with the unable sound transmission in vacuum, geometric attenuation, heat-conduction and relaxation effect, can provide the hydraulic motor pump shell of a super-silent by the propagation of the noise that can better ground isolation hydraulic motor pump produced.

Drawings

Fig. 1 is a schematic view of the inventive structure, fig. 2 is a left side view of the inventive structure, and fig. 3 is a view of the inner end face of the case.

Reference numerals and corresponding names: 1-shell, 2-oil inlet, 3-third O-shaped sealing ring, 4-first screw, 5-first O-shaped ring, 6-front cover, 7-first boss, 8-second O-shaped ring, 9-oil outlet, 10-base, 11-second boss, 12-hydraulic motor pump, 13-rear cover, 14-second O-shaped ring, 15-second screw, 16-vacuum port, 17-motor lead, 18-vacuum meter, and 19-base screw hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

As shown in fig. 1 to 3, the invention is an ultra-silent hydraulic motor pump housing, which comprises a housing 1, a front cover 6, a rear cover 13 and a base 10, wherein the front cover 6 and the rear cover 13 are respectively fastened with the housing 1 through a first screw 4 and a second screw 15, the base 10 and the housing 1 are of an integral structure, and a hydraulic motor pump 12 is embedded in the housing 1 through a first rib plate 1b, a second rib plate 1c, a third rib plate 1d and a fourth rib plate 1e on the housing 1; an oil inlet 2, a vacuumization port 16, a motor lead 17 and a vacuum gauge 18 are formed in the shell 1; a first boss 7 and an oil outlet 9 are formed in the front cover 6, a second boss 11 is formed in the rear cover 13, and the first boss 7 and the second boss 11 are respectively contacted with the front end and the rear end of a hydraulic motor pump 12; the shell 1 and the front cover 6 are sealed through a first O-shaped ring 5, the shell 1 and the rear cover 13 are sealed through a second O-shaped ring 14, a third O-shaped sealing ring 3 is arranged at the oil inlet 2, and a fourth sealing ring 8 is arranged at the oil outlet 9; the shell 1, the front cover 6, the rear cover 13, the first O-shaped sealing ring 5, the second O-shaped sealing ring 14, the third O-shaped sealing ring 3 and the fourth O-shaped sealing ring 8 form a closed vacuum cavity through a vacuum opening 16. A vacuum gauge 18 characterizes the degree of vacuum within the chamber. The vacuum degree is formed in the closed cavity to a certain degree through the vacuum opening, and the transmission of most of mechanical noise and fluid noise inside the hydraulic motor pump is blocked by utilizing the basic principle that sound waves cannot be transmitted in vacuum.

As shown in fig. 1 to 3, the inner wall of the housing 1 is provided with wedges 1a, the wedges 1a are arranged alternately with the first rib plate 1b, the second rib plate 1c, the third rib plate 1d and the fourth rib plate 1e, and the base 19 and the housing 1 are integrated and fixed to the base through screw holes 19. The wedge in the circumferential direction of the inner wall of the shell forms a miniature sound-deadening chamber, and residual sound waves can be geometrically attenuated by utilizing the wedge, so that the sound intensity is further reduced.

As shown in fig. 1 to 3, the shell 1, the front cover 6, the rear cover 13, the base 10, the first rib plate 1b, the second rib plate 1c, the third rib plate 1d, and the fourth rib plate 1e are all made of polyethylene. The change of the shape of long chain molecules generates internal friction heat, so that the phase difference between sound pressure and vibration speed is caused, and the residual sound energy is further absorbed to prevent the sound wave from being transmitted.

The working process of the invention is as follows: firstly, a certain degree of vacuum degree is formed in a sealed cavity formed between a shell and a front cover and a rear cover through a vacuum opening, and the transmission of most of mechanical noise and fluid noise in a hydraulic motor pump is blocked by utilizing the basic principle that sound waves cannot be transmitted in vacuum. Secondly, the inner part of the shell is distributed with wedges to form a miniature anechoic chamber which can geometrically attenuate the residual sound wave and further reduce the sound intensity. In addition, the shell, the front cover, the rear cover and the wedge are all made of polyethylene, internal friction heat generation is generated by utilizing the change of the shape of long-chain molecules of the polyethylene, the phase difference between sound pressure and vibration speed is caused, and the residual sound energy is further absorbed to prevent sound waves from being transmitted. This patent can't use multipurposely with the unable sound transmission in vacuum, geometric attenuation, heat-conduction and relaxation effect, can provide the hydraulic motor pump shell of a super-silent by the propagation of the noise that can better ground isolation hydraulic motor pump produced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A super-silent hydraulic motor pump shell comprises a shell body (1), a front cover (6), a rear cover (13) and a base (10), and is characterized in that the front cover (6) and the rear cover (13) are fastened with the shell body (1) through a first screw (4) and a second screw (15) respectively, the base (10) and the shell body (1) are of an integral structure, and a hydraulic motor pump (12) is embedded in the shell body (1) through a first rib plate (1 b), a second rib plate (1 c), a third rib plate (1 d) and a fourth rib plate (1 e) on the shell body (1); an oil inlet (2), a vacuumization port (16), a motor lead (17) and a vacuum meter (18) are formed in the shell (1); a first boss (7) and an oil outlet (9) are formed in the front cover (6), a second boss (11) is formed in the rear cover (13), and the first boss (7) and the second boss (11) are respectively contacted with the front end and the rear end of a hydraulic motor pump (12); the shell (1) and the front cover (6) are sealed through a first O-shaped ring (5), the shell (1) and the rear cover (13) are sealed through a second O-shaped ring (14), a third O-shaped sealing ring (3) is arranged at the oil inlet (2), and a fourth sealing ring (8) is arranged at the oil outlet (9); the shell (1), the front cover (6), the rear cover (13), the first O-shaped sealing ring (5), the second O-shaped sealing ring (14), the third O-shaped sealing ring (3) and the fourth O-shaped sealing ring (8) form a closed vacuum cavity through a vacuum opening (16).

2. The ultra-silent hydraulic motor pump housing of claim 1, wherein: the inner wall of the shell (1) is provided with wedges (1 a), the wedges (1 a) are arranged alternately with the first rib plate (1 b), the second rib plate (1 c), the third rib plate (1 d) and the fourth rib plate (1 e), the base (19) and the shell (1) are of an integrated structure, and the base is fixed on the base through screw holes (19).

3. The ultra-silent hydraulic motor pump housing of claim 1, wherein: the shell (1), the front cover (6), the rear cover (13), the base (10), the first rib plate (1 b), the second rib plate (1 c), the third rib plate (1 d) and the fourth rib plate (1 e) are all made of polyethylene.