Noise elimination structure of volute air inlet of high-speed high-pressure centrifugal blower

Abstract

The utility model discloses a noise elimination structure of a volute air inlet of a high-speed high-pressure centrifugal blower, which comprises a noise elimination section horizontally connected between an air inlet flow guide basin of the volute air inlet and an air outlet of an air inlet silencer, and the noise elimination section comprises an inner noise elimination layer, a middle noise elimination layer and an outer noise elimination layer which are sequentially sleeved with one another; the inner silencing layer is a mesh steel plate; the middle silencing layer is made of a silencing material; the outer silencing layer is a sound insulation steel plate. The high-frequency pneumatic noise at the volute of the high-speed and high-pressure centrifugal blower can be remarkably reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of blowers, and in particular relates to a muffler structure for a volute air inlet of a high-speed and high-pressure centrifugal blower. Background Art

[0002] High-speed and high-pressure centrifugal blowers are used in sewage treatment, flue gas desulfurization and oxidation treatment in power plants, material transportation in cement plants, etc. Since high-speed and high-pressure centrifugal blowers can save more than 30% of electricity compared with Roots blowers, water ring blowers and other models, the market share of high-speed and high-pressure centrifugal blowers is increasing.

[0003] High-speed and high-pressure centrifugal blowers generally need to work around the clock, and they will generate a lot of noise when working. The high-frequency aerodynamic noise at the volute of the high-speed and high-pressure centrifugal blower is the largest, which will cause certain physical damage to on-site workers.

[0004] At present, the devices for controlling equipment noise include: vibration reduction, sound absorption, sound insulation and comprehensive noise reduction. Its structural types can be divided into three categories: resistive silencing, reactive silencing and impedance composite silencing.

[0005] Vibration reduction and noise reduction technology: From the perspective of noise control, vibration isolation and noise reduction is only about how to reduce air noise and mechanical noise. The nearly rigid connection between the vibration source and the foundation or other objects is changed to an elastic connection to prevent or reduce the transmission of vibration energy.

[0006] Sound absorption and noise reduction technology: It uses sound absorption technology to control the noise propagation path. It is a traditional, commonly used and effective device. When sound waves encounter various solid obstacles during propagation, part of the sound waves are reflected, another part of the sound waves enters the solid obstacle and is absorbed, and a small part can be transmitted to the other side of the solid obstacle.

[0007] Sound insulation and noise reduction technology: It is a commonly used technical measure in noise control projects. It uses various plates and components of silencer carriers as shielding or uses the length structure of the silencer section to control the noise within a certain range, so that the propagation of noise in the air is blocked or the noise propagation curve in the silencer section reduces the sound wave energy of the noise. However, the outer layer has a shielding layer to seal the noise source, thereby achieving the purpose of reducing noise.

[0008] However, the above-mentioned noise reduction device has a relatively complex structure, and the materials usually used are sound insulation cotton (rubber plate, foam rubber plate, damping plate, etc.), sound-absorbing cotton (polyester fiber, centrifugal glass wool, rock wool, mineral wool, plant fiber, etc.) and porous sound insulation materials (such as galvanized mesh plate, stainless steel mesh plate, etc.). The noise reduction coefficient of these materials is less than 0.8, and the sound reduction effect is poor. Moreover, it is impossible to eliminate or reduce the high-frequency aerodynamic noise at the volute where the noise is the loudest. Utility Model Content

[0009] The utility model aims to provide a sound-absorbing structure for the air inlet of the volute of a high-speed and high-pressure centrifugal blower, so as to solve the technical problems raised in the above-mentioned background technology.

[0010] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0011] A sound-absorbing structure for a volute air inlet of a high-speed and high-pressure centrifugal blower comprises a sound-absorbing section horizontally connected between an air inlet guide basin of the volute air inlet and an air inlet muffler outlet, wherein the sound-absorbing section comprises a tubular inner sound-absorbing layer horizontally arranged on the left and right sides, a middle sound-absorbing layer fixedly sleeved on the outer side wall of the inner sound-absorbing layer, and an outer sound-absorbing layer fixedly sleeved on the outer side wall of the middle sound-absorbing layer; the inner sound-absorbing layer is provided with mesh holes; and the middle sound-absorbing layer is made of sound-absorbing material.

[0012] Furthermore, it also includes a pressing plate; the pressing plate is vertically fixed on the left and right end surfaces of the muffler section.

[0013] Furthermore, the pressure plate is softly connected to the air inlet guide basin of the volute air inlet.

[0014] Furthermore, the inner sound-absorbing layer and the outer sound-absorbing layer are made of steel.

[0015] Furthermore, the thickness of the inner sound-absorbing layer is 2 mm, the mesh aperture on the inner sound-absorbing layer is 10 mm, and the hole spacing is 15-20 mm.

[0016] Furthermore, the middle sound-absorbing layer is made of aluminum silicate material and has a thickness of 30 mm.

[0017] Furthermore, the thickness of the outer sound-absorbing layer is 2 mm.

[0018] The working process of the utility model is:

[0019] The noise enters the silencer section from the volute, firstly passes through the inner silencer layer to damp the sound propagation, reducing the reflection and propagation of the sound waves, and then enters the middle silencer layer through the mesh of the inner silencer layer. The aluminum silicate silencer material in the middle silencer layer absorbs the energy of the sound waves, absorbs the noise and continues to reduce the propagation of the noise. Finally, the outer silencer layer prevents the sound waves from propagating outward. The noise processed by the silencer section continues to enter the intake silencer, and is further reduced by the intake silencer.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. The silencer structure of the utility model not only lengthens the air inlet passage of the volute without substantially increasing the air flow resistance, but also shortens the thickness of the air intake silencer, saving materials, and can reduce the air flow extrusion noise generated by the volute of the centrifugal blower, playing a pretreatment role. The noise is weakened during the propagation of the silencer section, and then further processed by the air intake silencer to achieve an ideal noise reduction effect, thereby significantly reducing the high-frequency aerodynamic noise at the volute of the high-speed and high-pressure centrifugal blower, improving the working environment, and protecting the health of personnel.

[0022] 2. The muffler section of the utility model is softly connected to the volute, which can eliminate the airflow vibration transmitted to the volute, reduce the generation of noise, and eliminate the impact of vibration on the blower. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 It is an enlarged view of the A part of the utility model;

[0025] Figure 3 It is a cross-sectional view of the muffler section of the utility model;

[0026] In the attached drawings, 1-silencing section; 11-inner sound-absorbing layer; 12-middle sound-absorbing layer; 13-outer sound-absorbing layer; 14-pressing plate; 2-volute; 21-intake guide basin; 3-intake silencer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the utility model, and these aspects of the utility model can be realized even without these specific details.

[0028] A sound-absorbing structure for the air inlet of the volute 2 of a high-speed and high-pressure centrifugal blower includes a sound-absorbing section 1 horizontally connected between the air inlet guide basin 21 of the air inlet of the volute 2 and the air outlet of the air inlet silencer 3, wherein the sound-absorbing section 1 includes a tubular inner sound-absorbing layer 11 horizontally arranged left and right, a middle sound-absorbing layer 12 fixedly sleeved on the outer wall of the inner sound-absorbing layer 11, and an outer sound-absorbing layer 13 fixedly sleeved on the outer wall of the middle sound-absorbing layer 12; the inner sound-absorbing layer 11 is provided with mesh holes; the middle sound-absorbing layer 12 is made of sound-absorbing material. The inner sound-absorbing layer 11 can dampen the propagation of sound, reduce the reflection and propagation of sound waves, and allow sound waves to enter the middle sound-absorbing layer 12 through the mesh holes; the sound-absorbing material of the middle sound-absorbing layer 12 absorbs the energy of sound waves, thereby absorbing noise, and further reducing the propagation of noise; the outer sound-absorbing layer 13 can prevent sound waves from propagating outward.

[0029] It also includes a pressing plate 14; the pressing plate 14 is vertically fixed on the left and right end surfaces of the silencer section 1, and an opening equal to the inner diameter of the inner silencer layer 11 is opened in the middle of the pressing plate 14, so that the pressing plate 14 and the inner silencer layer 11 can be connected to the air inlet of the volute 2 and the air outlet of the air inlet silencer 3, and the pressing plate 14 is used to press and fix each silencer layer to ensure the structural stability of each silencer layer.

[0030] The pressure plate 14 is softly connected to the air inlet guide basin 21 of the air inlet of the volute 2, which can eliminate the air flow vibration transmitted to the volute 2, reduce the noise generation, and eliminate the impact of vibration on the blower; the silencer section 1 and the air inlet of the air inlet silencer 3 are hard connected by bolts, and a rubber sealing gasket is provided between the bolts and the nuts.

[0031] The inner sound-absorbing layer 11 and the outer sound-absorbing layer 13 are made of steel material, which can ensure the structural rigidity and stability of the sound-absorbing section.

[0032] The thickness of the inner sound-absorbing layer 11 is 2 mm, which can provide sufficient strength to withstand the pressure and vibration generated by the operation of the high-speed and high-pressure centrifugal blower while maintaining the stability of the structure; the mesh aperture on the inner sound-absorbing layer 11 is 10 mm, which can balance the sound absorption performance and the structural integrity of the material; the hole spacing is 15-20 mm, which can provide good sound absorption performance without excessively weakening the strength of the material.

[0033] The middle sound-absorbing layer 12 is made of aluminum silicate material and has a thickness of 30 mm, which can ensure the effect of absorbing noise.

[0034] The outer sound-absorbing layer 13 has a thickness of 2 mm, which can provide good sound insulation performance while ensuring sufficient strength and rigidity.

[0035] The working principle of the utility model is:

[0036] The noise enters the muffler section 1 from the volute 2, firstly passes through the inner muffler layer 11 to damp the sound propagation, reduces the reflection and propagation of the sound waves, and then enters the middle muffler layer 12 through the mesh of the inner muffler layer 11. The aluminum silicate muffler material of the middle muffler layer 12 absorbs the energy of the sound waves, absorbs the noise and continues to reduce the propagation of the noise. Finally, the outer muffler layer 13 prevents the sound waves from propagating outward. The noise processed by the muffler section 1 continues to enter the intake muffler 3, and is further reduced by the intake muffler 3.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A muffler structure for a volute air inlet of a high-speed and high-pressure centrifugal blower, comprising a muffler section horizontally connected between an air inlet guide basin of the volute air inlet and an air inlet muffler outlet, characterized in that: The sound-absorbing section comprises a tubular inner sound-absorbing layer arranged horizontally on the left and right sides, a middle sound-absorbing layer fixedly sleeved on the outer wall of the inner sound-absorbing layer, and an outer sound-absorbing layer fixedly sleeved on the outer wall of the middle sound-absorbing layer; the inner sound-absorbing layer is provided with mesh holes; the middle sound-absorbing layer is made of sound-absorbing material.

2. The muffler structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 1 is characterized in that: It also includes a pressing plate; the pressing plate is vertically fixed on the left and right end surfaces of the muffler section.

3. The muffler structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 2, characterized in that: The pressing plate is softly connected to the air inlet guide basin of the volute air inlet.

4. The muffler structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 1, characterized in that: The inner sound-absorbing layer and the outer sound-absorbing layer are made of steel material.

5. The muffler structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 1, characterized in that: The thickness of the inner sound-absorbing layer is 2 mm, the mesh aperture on the inner sound-absorbing layer is 10 mm, and the hole spacing is 15-20 mm.

6. The muffler structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 1, characterized in that: The middle sound-absorbing layer is made of aluminum silicate material and has a thickness of 30 mm.

7. The silencing structure of the volute air inlet of a high-speed and high-pressure centrifugal blower according to claim 1, characterized in that: The thickness of the outer sound-absorbing layer is 2 mm.

Images