JFH sound insulation cover
key word：Heat exchange element
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Product description
JFH sound insulation cover
1. Introduction
1.1. Purpose
JFH double sound insulation cover is mainly used for noise control of large noise equipment, such as steam turbine unit, steam feed pump, steel ball mill, fan, compressor, diesel generator set, etc.
1.2. Model meaning
JFH -(0 ×)
(0 ×) -- - - - 01.02.03.04 refers to the sound insulation cover of the coal mill; 05 indicates the sound insulation cover of the fan; 06 represents the sound insulation cover of the steam turbine; 07 represents the sound insulation cover of the steam driven feed water pump
1.3. Structural features
The form of sound insulation cover is shown in Figure 10-1
1.3.1. The whole sound insulation cover is a modular composite structure, which is composed of steel frame and sound insulation elements, which are transported to the site and connected by bolts; each sound insulation element is provided with lifting points, which is convenient for installation and disassembly. The sound insulation component is composed of panel, sound absorption material and damping layer.
1.3.2. The panel of sound insulation element is made of steel plate with thickness of 3-5mm; the framework is made of steel plate and section steel with thickness of 3-5mm; sound absorption material is made of ultra-fine glass wool board with large sound absorption coefficient; The polymer damping material coated on the surface of thin metal material is the material which can effectively avoid resonance and coincidence effect of internal loss and large internal friction; the perforated steel plate on the inner surface has customized the optimal aperture and the best perforation rate according to the noise spectrum characteristics. The thickness of each sound insulation element is 50-100 mm, and it is designed as modular interchangeable structure. The sound insulation cover adopts segmented module structure, which is easy to install and dismantle.
1.3.3. The sound insulation cover completely covers the whole treatment equipment, including the end face. The whole enclosure is fixed with the chassis ring beam through the steel frame and the bolts on the surrounding sound insulation elements; the chassis ring beam is welded on the foundation steel plate fixed with expansion bolts, so that the whole sound insulation cover is firmly and stably supported and fixed. In addition, a positioning device is also arranged at the corresponding position of the chassis ring beam.
1.3.4. The inspection door set around the sound insulation cover is a special sound insulation door, which is made of 2mm thick steel plate and has a folded sealing surface on the inner surface, so that the sound insulation door has good tightness and ensures the sound insulation effect.
1.3.5. The local treatment of sound insulation cover (including the sealing with motor shaft, sound insulation door and the connection between sound insulation element and steel frame, etc.) shall be small and beautiful, so as to control the accumulated leakage area on the side of the whole sound insulation cover in an appropriate range, so as to ensure that the whole sound insulation cover has a large sound insulation loss.
1.3.6. The structure of sound insulation cover fully considers the maintenance of the controlled equipment body, and strives to make the maintenance convenient under the premise of ensuring the sound insulation loss. The sound insulation cover can be lifted out in sections after some parts are removed,
1.3.7. The overall lighting shall be set in the sound insulation enclosure, and the location shall be determined by the user. Several lighting lamps are set in the heel, and the lighting design meets the corresponding standards.
1.3.8. Each sound insulation element of the sound insulation cover is provided with lifting lug bolts to facilitate lifting.
1.3.9. The top of sound insulation cover is open and closed. In the open top design, the perforated plate is used at the top and the louver ventilation muffler is set at the bottom to form natural convection ventilation; in the top closed design, the ventilation fan is set at the appropriate position on the top, and the air inlet and air inlet muffler are set at the appropriate position of the side wall to conduct forced convection cooling and ensure the safe operation of the equipment.
1.4. Working principle
The purpose of noise reduction is to achieve the purpose of noise reduction through the sound insulation cover when it is working.
2. Main technical parameters
2.1. Technical parameters of sound insulation components
2.1.1. The transmission loss of a single sound insulation element is 32dB (a).
2.1.2. The sound insulation loss of the enclosure is 25dB (a) (in static and free sound field).
2.2. Parameter description
2.2.1. After installing sound insulation cover on the equipment body, only the running noise of the covered equipment can be controlled.
2.2.2.2. The running noise after installing sound insulation cover on the equipment body is the comprehensive reflection of each sound source at the measurement point, and is the result of multiple factors superposition.
2.2.3. The sound insulation cover only insulates the noise of the quilt cover body, and solves the main contradiction. Its effect depends on the difference between other secondary and primary contradictions, that is, on the noise level of other secondary noise sources
2.2.4. The sound insulation loss of the sound insulation cover is about 25dB. The actual sound insulation loss cannot be measured after being installed on site. Only the sound transmission loss from the enclosure to the enclosure can be measured (the transmission loss is generally about 20dB), and the actual sound insulation loss of the enclosure is greater than the measured value.
3. Equipment appearance and structural dimensions
3.1. Typical L / W / H dimensions
JFH type sound insulation cover is a non-standard product, the actual shape is mainly determined according to the condition of the quilt equipment. Generally, the length and width of the shell is determined by the multiple of the standard steel plate width after folding plus the trimming value according to the field size, while the height size is determined according to the actual situation. The thickness of the outer wall steel plate is generally 3-5 mm, and the thickness of the sound absorption layer is 50-100 mm. The thickness of damping layer is calculated according to the actual calculation. See Figure 10-2 and table 10-1 for typical shell shape and structural dimensions.
3.2. Interface size
The size of joint position between JFH type sound insulation cover and equipment shall be determined according to the actual situation.
Table 10-1 typical shell structure dimensions
| Item | Dimensions | Item | Dimensions |
| L | N×B+E | Outer wall | 3～5 |
| A | N×B+D | Sound absorbing layer | 5～100 |
| B | 1160 | Damping layer | by calculation |
| D | Adjustment value | Door width | 812 |
| E | Adjustment value | Door height | 1900 |
| H | Site determination |
4. Selection method
4.1. Determination of sound insulation components
First of all, according to the noise spectrum of the noise equipment and the surrounding noise sources, the thickness of the outer plate, the thickness of the damping layer, the density of the sound absorption layer, the thickness of the sound absorption layer, the aperture and the opening rate of the perforated plate should be determined according to the noise spectrum of the noise equipment covered and the surrounding noise sources.
4.2. Determination of sound insulation cover size
JFH type sound insulation cover is an assembled non-standard product. Its overall dimension is mainly determined by the actual situation of the equipment and the site.
5. Scope of supply (typical range, which can be increased or decreased according to user demand and actual situation)
The scope of supply includes product body and relevant drawings, construction scheme and disassembly instructions. Among them, the product body part includes JFH type turbine casing sound insulation components, JFH type turbine cover beam, column parts and accessories, supporting lighting system, supporting ventilation muffler, supporting ventilation fan (selection), lock, lamp, pressure bar and other spare parts, as well as special tools such as sleeve plate, self tapping screw clamp, etc.
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