A noise reduction device for a fluid jet enhanced lapping apparatus

Abstract

The application provides a noise reduction device for a jet flow reinforced grinding processing equipment, which comprises a shell, the internal space of the shell is divided into a central inner cavity and a cavity arranged outside the central inner cavity, a main connecting pipe in communication with the central inner cavity and a spiral pipe in communication with the cavity are mounted at the bottom of the shell, and the main connecting pipe is composed of a plurality of reflection sections and a plurality of connecting sections. The application has the advantages of simple and compact structure, increased number of absorption peaks, expanded sound absorption range, improved sound absorption selectivity and sound absorption range of the traditional equipment, sound absorption through the plurality of reflection sections and connecting sections, effectively reduced noise generated during jet flow impact reinforced modification grinding processing, and improved processing environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of noise reduction technology, in particular to a noise reduction device for jet flow reinforced grinding processing equipment. BACKGROUND

[0002] Jet impact strengthening modification grinding processing is a kind of anti-fatigue, anti-corrosion, anti-wear metal material precision machining technology based on composite machining method, which is to use grinding spray material composed of strengthening steel shot, grinding powder and grinding fluid to uniformly and high-speed impact the surface of bearing ring through the action of high-pressure gas. However, due to the processing method adopted by impact, noise will be generated in the processing cavity. Long-term exposure to processing noise will reduce the work efficiency of workers, and the installation space of the noise reduction device is relatively strict due to the size of the processing inner cavity.

[0003] The Helmholtz resonator is a structure applied to absorb medium and low frequency noise. A single Helmholtz resonator is composed of a closed cavity and an air inlet pipe connected thereto. When external sound waves enter the cavity through the air inlet pipe, the pressure in the cavity changes, and due to the compressibility of air, the air in the air inlet pipe part vibrates, part of the sound energy is consumed through air column vibration, and the sound absorption effect is achieved. It is widely used in vehicle exhaust pipes, ship air conditioning pipes, industrial exhaust pipes and other occasions. However, the Helmholtz resonator has strong sound absorption selectivity, and there is only an absorption peak for a special frequency sound, which is not suitable for occasions with a wide range of noise source frequencies. SUMMARY

[0004] The purpose of the present application is to provide a noise reduction device for jet flow reinforced grinding processing equipment. Under the condition that the volume of the Helmholtz resonator cavity and the cross-sectional area and length of the air inlet pipe are unchanged, the structure is changed to further reduce the resonant frequency and increase the resonant absorption peak, so that it is not affected by small space, has sound absorption effect for lower frequency sound, and is suitable for jet impact strengthening modification grinding processing noise reduction.

[0005] The present application provides a noise reduction device for jet flow reinforced grinding processing equipment, which comprises a shell, the internal space of the shell is divided into a central inner cavity and a cavity arranged outside the central inner cavity, a main connecting pipe communicated with the central inner cavity and a spiral pipe communicated with the cavity are installed at the bottom of the shell, and the main connecting pipe is composed of a plurality of reflection sections and a plurality of connecting sections.

[0006] Further, the cavity comprises an annular auxiliary cavity arranged outside the central inner cavity and an annular outer cavity arranged outside the auxiliary cavity, the volume of the auxiliary cavity is greater than that of the central inner cavity, and the volume of the outer cavity is greater than that of the auxiliary cavity.

[0007] Further, the spiral pipe comprises a first spiral pipe and a second spiral pipe, the first spiral pipe is communicated with the auxiliary cavity, and the second spiral pipe is communicated with the outer cavity.

[0008] Further, an axis of the first spiral pipe away from the port of the auxiliary cavity is 32° with the axis of the main connecting pipe, and an axis of the second spiral pipe away from the port of the outer cavity is 26° with the axis of the main connecting pipe.

[0009] Further, the central inner cavity, the auxiliary cavity and the outer cavity are coaxially arranged.

[0010] Further, the connecting section comprises a first connecting section and a second connecting section, the reflecting section comprises a first reflecting section and a second reflecting section, and the first connecting section and the second connecting section are communicated through the first reflecting section.

[0011] Further, one end of the first connecting section away from the first reflecting section is communicated with the central inner cavity.

[0012] Further, one end of the second connecting section away from the first reflecting section is communicated with the second reflecting section.

[0013] Further, the first connecting section and the second connecting section are internally provided with a plurality of inner holes.

[0014] Further, the first reflecting section and the second reflecting section are internally provided with a plurality of baffles, and each of the baffles is provided with a circular hole.

[0015] The present application has the advantages of simple and compact structure, increased absorption peak number and enlarged sound absorption range through the arrangement of the central inner cavity and the cavity, improved sound absorption selectivity and sound absorption range in the traditional equipment, effectively reduced noise generated during jet impact strengthening modification grinding through the sound absorption of the multiple reflecting sections and connecting sections, and improved processing environment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is an internal structure diagram of the present application;

[0018] Figure 2 It is an overall structure diagram of the present application;

[0019] Figure 3 for the present application Figure 1 enlarged view at A in

[0020] Figure 4 for the present application Figure 1 enlarged view at B in

[0021] Figure 5 for the present application Figure 3 enlarged view at C in

[0022] BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings: 1 - main connecting pipe, 11 - first connecting section, 12 - first reflecting section, 13 - second connecting section, 14 - second reflecting section, 15 - inner hole, 16 - conical baffle, 17 - round hole, 18 - baffle, 2 - first spiral pipe, 3 - second spiral pipe, 4 - shell, 41 - central inner cavity, 42 - auxiliary cavity, 43 - outer cavity; DETAILED DESCRIPTION

[0024] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0026] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "plurality" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Embodiment 1

[0028] As Figures 1-5 shown:

[0029] A noise reduction device for jet flow reinforced grinding processing equipment, which is integrally formed by 3D printing, comprises a shell 4. In order to improve the sound absorption efficiency of the shell 4, two absorption peaks are added inside the shell 4. Therefore, the inside space of the shell 4 is divided into three cavities, including a central inner cavity 41 located in the middle, an annular auxiliary cavity 42 arranged outside the central inner cavity 41, and an annular outer cavity 43 arranged outside the auxiliary cavity 42. The central inner cavity 41, the auxiliary cavity 42 and the outer cavity 43 are coaxially arranged and are not communicated with each other.

[0030] The volumes of the three cavities increase successively from inside to outside. The volume of the auxiliary cavity 42 is greater than that of the central inner cavity 41, and the volume of the outer cavity 43 is greater than that of the auxiliary cavity 42.

[0031] The bottom of the shell 4 is provided with a main connecting pipe 1 communicating with the central inner cavity 41, a first spiral pipe 2 communicating with the auxiliary cavity 42, and a second spiral pipe 3 communicating with the outer cavity 43.

[0032] As Figure 1 and Figure 3 shown, the main connecting pipe 1 is composed of two end reflection sections and two end connecting sections.

[0033] The connecting sections include a first connecting section 11 and a second connecting section 13, and the reflection sections include a first reflection section 12 and a second reflection section 14. The first connecting section 11 and the second connecting section 13 are communicated through the first reflection section 12.

[0034] The end of the first connecting section 11 away from the first reflection section 12 is communicated with the central inner cavity 41, and the end of the second connecting section 13 away from the first reflection section 12 is communicated with the second reflection section 14.

[0035] The first connecting section 11 and the second connecting section 13 are internally provided with five inner holes 15, the inner diameters of the inner holes 15 are different, and the inner holes 15 are used for canceling noises of different frequencies and widening the sound absorption frequency range.

[0036] As shown in Figure 4 and Figure 5 , the first reflecting section 12 is internally provided with a conical baffle 16, the inner angle of the conical baffle 16 is 138°, the second reflecting section 14 is internally provided with three baffles 18, the included angle between the baffle 18 and the inner wall of the second reflecting section 14 is 75°, and a circular hole 17 is formed in the baffle 18.

[0037] The baffle 18 makes the noise collide in the space, cancels part of the sound waves, and forms a connecting channel between the spaces, when the pressures of the adjacent two cavities are not equal, the sound waves incident from the two ends of the connecting channel collide with each other, weaken part of the noise, and because the sound waves enter the central inner cavity 41, the length of the connecting pipe is equivalent to being lengthened, so that the resonance frequency of the device is lower.

[0038] The first spiral pipe 2 and the second spiral pipe 3 are both spirally upward with a taper α, the length of the pipe is lengthened by the taper, the axis of the port of the first spiral pipe 2 away from the auxiliary cavity 42 and the axis of the main connecting pipe 1 form an included angle of 32°, and the axis of the port of the second spiral pipe 3 away from the outer cavity 43 and the axis of the main connecting pipe 1 form an included angle of 26°.

[0039] The device will select the optimal design parameters of the preset structure by using the orthogonal test method, and the specific steps are as follows:

[0040] S1: the preset influence parameters are three, which are A, the number of inner cavities, B, the number of inner holes 15 in the first connecting section 11 and the second connecting section 13 of the main connecting pipe 1, and C, the area ratio between the inner holes 15 in the first connecting section 11 and the second connecting section 13 of the main connecting pipe 1;

[0041] S2: A has three values, i.e. three levels (2, 3, 4), B has three levels (3, 4, 5), and C has three levels (the ratio of the hole diameters is 1:1, the ratio of the adjacent hole diameters is 1:1.2, and the ratio of the hole diameters separated by 1:1);

[0042] S3: an orthogonal table is established, a model simulation is established according to the orthogonal table, and the simulation data is filled in the orthogonal table;

[0043] S4: the influence degree of each factor on TL (transmission loss) and resonance frequency is calculated, the optimal value is selected in each factor, and the optimal design parameters are A3B3C2;

[0044] S5: a model simulation is established according to the optimal design parameters, and the simulation is compared with that of the ordinary Helmholtz resonator.

[0045] The use process and working principle of the device: the device is installed on the inner cavity of the jet flow strengthening grinding processing equipment through adhesion or concave-convex cooperation. When the noise source sounds, part of the sound waves enter the center inner cavity 41 through the main connecting pipe 1, and part of the sound waves enter the auxiliary cavity 42 and the outer cavity 43 through the first spiral pipe 2 and the second spiral pipe 3 respectively. The sound waves entering the first spiral pipe 2 and the second spiral pipe 3 enter the auxiliary cavity 42 and the outer cavity 43 along the pipes respectively, so that the air pressure in the cavity changes, and then the air column vibration in the first spiral pipe 2 and the second spiral pipe 3 occurs, weakening the sound waves.

[0046] The sound waves entering the main connecting pipe 1 pass through the second reflection section 14, the second connecting section 13, the first reflection section 12 and the first connecting section 11 inside the main connecting pipe 1 in turn. First, the sound waves pass through the spaces separated by the baffle 18 in the second reflection section 14. Due to the blocking of the baffle 18, the sound waves reflect in each space, and when passing through each connecting channel, the incoming and outgoing sound waves collide, causing air column vibration in each connecting channel and weakening part of the sound waves; after passing through the second connecting section 13, the sound waves enter the first reflection section 12, which has the same effect as the second reflection section 14, strengthening the echo and reflection through the blocking of the baffle 18, and finally the remaining sound waves enter the first connecting section 11 and then enter the center inner cavity 41.

[0047] The flow of sound waves changes the pressure of the center inner cavity 41, causing the air column in the five inner holes 15 of the first connecting section 11 to vibrate, and because the areas of the five inner holes 15 are different, according to the formula of the Helmholtz resonator resonance frequency, the frequencies of the sound waves absorbed by them are different, thereby widening the sound absorption frequency range. Similarly, in the second connecting section 13 between the first reflection section 12 and the second reflection section 14, the five inner holes 15 with different areas all vibrate due to the influence of the pressure inside the first reflection section 12 and the second reflection section 14, weakening the sound wave intensity and thus playing a noise reduction role.

[0048] The device has a simple and compact structure. By setting the center inner cavity and the cavity, the number of absorption peaks is increased, the sound absorption range is expanded, and the problem of strong sound absorption selectivity and small sound absorption range in traditional equipment is improved. By setting multiple inner holes with different inner diameters in the connecting section, multiple frequencies of sound waves can be absorbed, widening the sound absorption frequency range. By the baffle in the reflection section and the circular holes opened in the baffle, the sound waves reflect and collide in multiple spaces, eliminating part of the sound waves, effectively reducing the noise generated during jet impact strengthening modification grinding processing, and improving the processing environment.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A noise reduction device for jet-enhanced grinding equipment, characterized in that: The shell is internally divided into a central cavity and a cavity outside the central cavity, and a main connecting pipe communicating with the central cavity and a spiral pipe communicating with the cavity are mounted at the bottom of the shell, the main connecting pipe is composed of a plurality of reflection sections and a plurality of connecting sections; The cavity comprises an annular sub-cavity outside the central cavity and an annular outer cavity outside the sub-cavity, the volume of the sub-cavity is greater than that of the central cavity, and the volume of the outer cavity is greater than that of the sub-cavity; The spiral pipe comprises a first spiral pipe and a second spiral pipe, the first spiral pipe communicates with the sub-cavity, and the second spiral pipe communicates with the outer cavity; The axis of the end of the first spiral pipe away from the port of the sub-cavity forms a 32° angle with the axis of the main connecting pipe, and the axis of the end of the second spiral pipe away from the port of the outer cavity forms a 26° angle with the axis of the main connecting pipe; The central cavity, the sub-cavity and the outer cavity are coaxially arranged.

2. The noise reduction device for the fluid-jet enhanced lapping apparatus according to claim 1, wherein: The connecting section comprises a first connecting section and a second connecting section, the reflection section comprises a first reflection section and a second reflection section, and the first connecting section and the second connecting section communicate through the first reflection section.

3. The noise reduction device for the fluid -jet enhanced lapping apparatus according to claim 2, wherein: The end of the first connecting section away from the first reflection section communicates with the central cavity.

4. The noise reduction device for the fluid -jet enhanced lapping apparatus according to claim 3, wherein: The end of the second connecting section away from the first reflection section communicates with the second reflection section.

5. The noise reduction device for the fluidic enhanced lapping apparatus according to claim 4, wherein: A plurality of inner holes are formed in the interiors of the first connecting section and the second connecting section.

6. The noise reduction device for the fluid -jet enhanced lapping apparatus according to claim 5, wherein: A plurality of baffles are arranged in the interiors of the first reflection section and the second reflection section, and a circular hole is formed in each baffle.

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