CN2148206Y - Multi-duct bent type noise reducing device for blaster - Google Patents

Abstract

The utility model relates to a multi-duct bent type noise reducing device for blaster. The design of the utility model is finished by synthetically adopts multiple noise reducing principle of sound insulation, sound absorption, damping vibration and damping muffler. In the structural design, a blaster is arranged inside a sound insulation cover whose inner wall is coated with sound absorption and damping vibration isolation material. The upper part of the cover is equipped with a multi-duct bent type resistive silencer with a plate structure and is fixed together with a cover body. The cover body adopts unit plates and is sealed and assembled by rubber plates which are elastically spliced, so the noise reducing device becomes an integrated combination equipment. The utility model has simple structure, simple preparing process, convenient installation and low cost. The application of the utility model can effectively reduce aerodynamically-induced noise and mechanical noise of the blaster, and can satisfy environmental protection requirement of harnessing noise pollution.

Description

Multi-duct bent type noise reducing device for blaster

A kind of denoising device equipment of administering all kinds blower noise belongs to the environment protection equipment technical field.

At present, administer blower noise and adopt silencing pot equipment mostly,, can not subdue the blower mechanical noise because the use of silencing pot can only be subdued aerodynamic noise; In the using process, dust stops up an interior noise elimination road micropore easily, makes muffler part cover with dust, causes its piece poor effect that disappears, and is difficult to reach Standard of Environmental Noise and noise of equipment standard, and the infringement operator's is healthy, influences resident's normal life.

Administer the purpose that blower noise pollutes in order to reach, designer's design also provides a kind of multiple duct that can effectively administer the blower noise pollution to curve formula blower sound insulation and noise reducing equipment.

The utility model comprehensively adopts sound insulation, sound absorption, damping isolation and four kinds of principle of noise reduction designs of resistance formula noise reduction to finish.

Scheme task of the present utility model is blower is placed in the acoustic hood, be coated with on the inwall of its cover and post sound absorption, damping isolation material, to produce the effect of sound absorption sound-insulation vibration-proof, the multiple duct that a kind of plate armature is set on the top of its cover curve the formula dissipative muffler and and cover body make up and be fixed as one, cover body adopts the unit plate by rubber plate elasticity grafting seal combination, makes its becoming one of noise reducing apparatus composite set.

The utility model equipment noise reduction is obvious, can not only subdue aerodynamic noise, and can subdue the mechanical noise of blower, its application can on average be subdued blower noise more than the 18dB, its noise loudness is subdued more than 72%, project organization is reasonable, multiple duct is curved the formula dissipative muffler and acoustic hood fuses into one, and can utilize the air draught effect of blower that blower motor is lowered the temperature, comparable former blower temperature reduces more than 2 ℃, and whole noise reducing apparatus adopts the split-mounting type structure, is easy to processing and fabricating, installation and removal are convenient, can be widely used in all kinds blower sound insulation and noise reduction and administer the pollution aspect.

Accompanying drawing is that multiple duct curves formula blower denoising device office and cuts open schematic representation, also is Figure of abstract.

The design is further specified and is provided embodiment below in conjunction with accompanying drawing.With reference to accompanying drawing, as can be seen, this device is made up of silencing apparatus and acoustic hood two large divisions, and silencing apparatus snaps onto above the acoustic hood and is tightly connected by rubber plate becomes the cube of a square type; Silencing apparatus is a kind of multiple duct resistance formula piece device ［ 1 ］ that disappears, left end at silencing apparatus has a plurality of air inlet ducts ［ 2 ］, consider from noise reduction, intake grill and air inlet duct are designed to the square type, post sound-absorbing material ［ 3 ］ on the inwall of air inlet duct ［ 2 ］, have the exhaust vent ［ 4 ］ of square type in the right-hand member bottom in each air channel of silencing apparatus, silencing apparatus is connected as elasticity with acoustic hood by rubber plate ［ 9 ］.Silencing apparatus is mainly used to eliminate aerodynamic noise, when blower is worked, by a plurality of intake grills with airflow diversion, because the area sum of a plurality of intake grills is greater than the incoming air area of blower, so the air intake wind speed is decreased, reduced the turbulence noise and the windage of the excessive generation of air-flow; The air draught total amount of blower is divided equally by a plurality of air channels, the air channel air-flow is tended to be steady, also make turbulent flow reduce and the reduction turbulence noise, some turbulence noise is absorbed by the sound-absorbing material around the air channel when diffusion, because curving, air-flow enters in the acoustic hood, so in the process that air-flow curves, the sound absorbing material that most of high frequency noise is curved on the tube wall absorbs.Enter the air-flow of acoustic hood, through blower motor, enter blower inlet then earlier, motor is constantly carried out forced air cooling, therefore the temperature of motor is decreased.Referring to accompanying drawing, can see, in the bottom of rubber plate ［ 9 ］ is a kind of square type acoustic hood ［ 5 ］ that is used for subduing the blower mechanical noise, its cover is by the metallic material shell, gradient damping sound-absorbing material layer ［ 6 ］ and sound-absorbing material layer ［ 3 ］ are formed, when blower is worked, a mechanical noise part that produces is converted into thermal energy consumption by sound-absorbing material layer ［ 3 ］ absorption and falls, a part penetrates sound-absorbing material layer ［ 3 ］ and enters the metallic material shell, and entered in the sound-absorbing material layer and by metallic material reflection and to consume by sound-absorbing material, because noise can cause the bending deflection of metallic material shell and then produce resonance when the transmission metallic material, parasitic resonance noise takes place, the effect of noise reduction is reduced, in order to eliminate the resonance of metallic material, the designer scribbles damping glue in sound-absorbing material layer to form thick be the gradient damping layer of 6 millimeter, and to increasing progressively gradually firmly, promptly elasticity degree of presenting changes the elasticity of its damping layer by soft.Damping layer and sound-absorbing material together stick on the metallic material shell, when metallic material is shaken the generation bending, its vibrational energy is passed to the damping layer that sticks on the metallic material rapidly, cause the damping layer internal friction and the changing of the relative positions mutually, the Conversion of energy that makes the vibration of most of metal is heat energy and loss, in addition, metal shell is pasted damping material, also can significantly reduce the time of vibration of metallic material, owing to significantly reduced the resonance of metallic material and reduced resonance time of metallic material, it also can be cut down significantly by the metallic material caused parasitic noise that resonates.On the wall of sound-insulating cover, be provided with access door ［ 7 ］ and the viewing window ［ 8 ］ of being convenient to workman's operation and maintenance, whole device all adopts the assembling combination structure, can arbitrarily increase or reduce volume according to reality, this device can and can fully satisfy the requirement of administering noise pollution with the supporting use of various types of blowers.

Claims (4)

1, a kind of multiple duct curves formula blower denoising device, it is characterized in that it is by becoming the integrated device that a kind of multiple duct curves formula blower sound insulation and noise reducing by rubber plate elasticity snapping seal combination between a kind of multiple duct dissipative muffler of plate armature and the combined type acoustic hood.

2, multiple duct according to claim 1 curves formula blower denoising device, and it is rectangular-shaped to it is characterized in that said air channel and inlets and putlets of ventilation are, and air-flow enters air channel ［ 2 ］ and curves by exhaust outlet ［ 4 ］ and enter acoustic hood ［ 5 ］.

3, multiple duct according to claim 1 curves formula blower denoising device, it is characterized in that being bonded with sound-absorbing material ［ 3 ］ on its inwall of acoustic hood ［ 5 ］, in this sound-absorbing material layer, scribble damping glue, it is hard to make that sound-absorbing material on the acoustic hood forms a kind of surface, inner soft and rubber-like gradient damping sound-absorbing material ［ 6 ］.

4, multiple duct according to claim 1 curves formula blower denoising device, it is characterized in that said combined type acoustic hood ［ 5 ］ is to be combined by rubber plate ［ 9 ］ elasticity snapping by a plurality of cover plates, acoustic hood ［ 5 ］ is by rubber plate ［ 9 ］ and the ground surface elastic sealing and fixing of joining.

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