CN215054135U - Steel structure noise reduction protection barrier structure for centrifugal oxygen compressor - Google Patents
Steel structure noise reduction protection barrier structure for centrifugal oxygen compressor Download PDFInfo
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- CN215054135U CN215054135U CN202022762985.5U CN202022762985U CN215054135U CN 215054135 U CN215054135 U CN 215054135U CN 202022762985 U CN202022762985 U CN 202022762985U CN 215054135 U CN215054135 U CN 215054135U
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Abstract
The application discloses a steel structure noise reduction protective barrier structure for a centrifugal oxygen compressor, which is provided with a plurality of main column nodes, wherein a noise reduction protective barrier layer is fixedly arranged between every two adjacent main column nodes, and each noise reduction protective barrier layer comprises an outer protective layer, a noise reduction layer, an inner protective layer and a fire-resistant layer which are sequentially arranged, wherein the inner surfaces of the outer protective layer, the noise reduction layer, the inner protective layer and the fire-resistant layer are adhered with polymer damping layers; the main column node comprises a steel pipe connecting piece, a stud penetrating through the steel pipe connecting piece and a channel steel keel arranged on the side surface of the steel pipe connecting piece; the utility model discloses a noise damping layer, including two main column nodes, the U-shaped opening of two channel-section steel keels is inserted between the U-shaped opening of two adjacent main column nodes, utilizes the stud of main column node, and inoxidizing coating and flame retardant coating in installing in proper order in the inboard of amortization layer, install outer inoxidizing coating in the outside of amortization layer. The structure of this application, it is convenient for carry out the modularization installation and dismantle at the job site, and the engineering is realized easily, can form effective enclosure to centrifugal oxygen compressor, has very big engineering application prospect.
Description
Technical Field
The utility model belongs to the technical field of industrial equipment installation engineering, concretely relates to steel construction amortization protective barrier structure for centrifugal oxygen compressor.
Background
The centrifugal oxygen compressor is common industrial equipment in the air separation industry, because oxygen belongs to combustion-supporting media, and the higher the purity and the pressure of the oxygen, the stronger the oxidability of the oxygen, the more easy oxygen explosion occurs, when rust, welding slag and other mechanical impurities exist in an oxygen flow channel in the centrifugal oxygen compressor, particles moving at high speed impact and collide with a pipe wall, or parts in contact with the oxygen are polluted by grease, the explosion accident of the oxygen compressor is easy to occur, and the life safety of people and the property safety of equipment around are seriously threatened. In order to reduce and control the serious consequences of oxygen compressor explosion, standard regulations stipulate that centrifugal oxygen compressors must be surmounted by protective walls (hoods) to reduce the hazardous area of the centrifugal oxygen compressors. In the past engineering practice, a reinforced concrete wall is usually adopted as a barrier for enclosing a centrifugal oxygen compressor, and in the post analysis and treatment of the explosion accident of a multi-stage centrifugal oxygen compressor, the reinforced concrete barrier wall is proved to be a very effective structural form and can sufficiently bear the jet erosion of molten metal, explosion shock waves, overpressure and the impact of an explosion projectile when the oxygen compressor is exploded. However, the reinforced concrete barrier wall has the defects of heavy self weight, slow construction speed, long maintenance period, high manufacturing cost and the like.
In addition, the centrifugal oxygen compressor, as a rotating device, emits strong noise during its operation. The noise is characterized by wide related area, multiple generation sources, long propagation distance and high sound level. In order to ensure the occupational health safety of patrolling and examining workers and meeting the environmental protection requirement of industrial enterprise factory noise, the compressor is required to be subjected to sound insulation and noise elimination treatment. In engineering practice, a sound-proof shield is usually added on a compressor, a noise generating source is limited in the sound-proof shield, and a partition plate of the sound-proof shield vibrates under the action of sound waves to consume transmitted sound energy, so that direct sound is reduced; when the transmitted sound and the reflected sound pass through the sound absorption material in the sound insulation cover, the resonance of a fine cavity in the sound absorption material is caused, and the sound energy is converted into heat energy to be consumed, so that the reflected sound and the mixed phase sound are reduced; a part of sound waves are reflected back by a material with high density and high characteristic impedance, so that noise is limited near a noise source, and the radiation energy of the noise is reduced. However, when the soundproof cover is used as a soundproof and noise-reducing measure of the centrifugal oxygen compressor, the mechanical strength and the fireproof performance of the soundproof cover cannot bear the impact of molten metal jet and explosion projectile when the oxygen compressor is exploded, and the soundproof cover is easily burnt and broken, thereby causing damage to surrounding personnel or equipment.
The steel structure noise reduction protective screen for the centrifugal oxygen compressor is convenient to mount and dismount, fast in construction, low in manufacturing cost, high in strength, good in thermal protection and good in sound insulation and noise reduction effects, is developed by combining the technical backgrounds of the two aspects, and has great engineering application prospect.
Disclosure of Invention
An object of the utility model is to develop a modularization installation and dismantlement, engineering realize easy steel construction amortization protective barrier structure. The steel structure barrier wall adopting the structure can form effective enclosure for the centrifugal oxygen compressor, can completely replace the traditional reinforced concrete protective wall in the aspects of anti-explosion strength and thermal protection function, and has excellent sound insulation and noise elimination performance.
The steel structure silencing and protecting barrier structure for the centrifugal oxygen compressor is characterized in that the steel structure silencing and protecting barrier structure is provided with a plurality of main column nodes, a silencing and protecting barrier layer is fixedly arranged between every two adjacent main column nodes, and the silencing and protecting barrier layer comprises an outer protecting layer, a silencing layer, an inner protecting layer and a fire-resistant layer which are sequentially arranged, wherein the inner surface of the outer protecting layer is adhered with a high-molecular damping layer; the main column node comprises a steel pipe connecting piece, a stud penetrating through the steel pipe connecting piece and a channel steel keel arranged on the side surface of the steel pipe connecting piece, wherein a U-shaped opening of the channel steel keel is arranged in a direction opposite to the direction of the steel pipe connecting piece;
when a silencing protection barrier layer is installed between two adjacent main column nodes, a silencing layer is inserted between U-shaped openings of two channel steel keels on the corresponding side surfaces of the two adjacent main column nodes, an inner protective layer and a fire-resistant layer are sequentially assembled on the silencing layer towards the inner side of the centrifugal oxygen compressor, and the end parts of the protective layer and the fire-resistant layer are locked and fixed on one side of the steel pipe connecting piece facing the centrifugal oxygen compressor through a stud bolt and a matched nut on the steel pipe connecting piece; an outer protective layer with a polymer damping layer adhered on the inner surface is assembled on the outer side of the silencing layer back to the centrifugal oxygen press, and the end part of the outer protective layer is locked and fixed on one side of the steel pipe connecting piece back to the centrifugal oxygen press through a stud bolt on the steel pipe connecting piece and a matched nut.
A steel construction amortization protection protective screen structure for centrifugal oxygen press, its characterized in that the amortization layer adopts fire-retardant type to inhale the cotton module of sound, the cotton module of sound is inhaled by fire-retardant type is formed by the cotton layer laminating of polyester fiber and the cotton layer of fire-retardant carbon fiber.
The steel structure noise reduction protection barrier structure for the centrifugal oxygen compressor is characterized in that the inner protection layer is a carbon steel plate, and the fire-resistant layer is a fiber reinforced calcium silicate fire-proof plate.
The steel structure noise reduction protective barrier structure for the centrifugal oxygen compressor is characterized in that the outer protective layer is a galvanized steel outer protective plate, the high polymer damping layer is self-adhesive polyurethane resin, epoxy resin, acrylic resin or vinyl acetate resin, and the high polymer damping layer is directly adhered to the inner surface of the galvanized steel outer protective plate.
The steel structure noise reduction protection barrier structure for the centrifugal oxygen compressor is characterized in that the steel pipe connecting piece comprises two rectangular steel pipes, one channel steel keel is welded and fixed to the short side face of each rectangular steel pipe, and the two rectangular steel pipes welded with the channel steel keels are combined in a crossed staggered mode, so that two channel steel keels are arranged on two opposite sides of one steel pipe connecting piece formed by combining the two rectangular steel pipes; the damping plate is attached to the long side faces of the two rectangular steel pipes of the steel pipe connecting piece, the two rectangular steel pipes and the damping plate between the two rectangular steel pipes are provided with two sets of studs in a penetrating mode, namely a main column node used for installing a noise reduction protection barrier layer is formed, and the two sides of the main column node can be fixedly installed on the noise reduction protection barrier layer through the corresponding channel steel keels and the studs.
The steel structure noise reduction protection barrier structure for the centrifugal oxygen compressor is characterized in that the vibration reduction plate is a butyl rubber or nitrile rubber vibration reduction plate; the width of the channel steel keel is equal to or slightly smaller than the sum of the widths of the two rectangular steel pipes.
The steel structure silencing and protecting barrier structure for the centrifugal oxygen compressor is characterized in that the heights of all layers in an outer protecting layer, a silencing layer, an inner protecting layer and a fireproof layer of the silencing and protecting barrier layer are the same and are marked as the height of the barrier; the height of the rectangular steel pipe and the height of the channel steel keel are equal to the height of the barrier.
The steel structure noise reduction protection barrier structure for the centrifugal oxygen compressor is characterized in that the height of the barrier is at least 0.6 m greater than the highest point of a centrifugal oxygen compressor body to be protected by the barrier, and the height of the barrier is within the range of 2.5-4 m.
Compared with the prior art, the utility model discloses the beneficial effect who gains is:
1) the utility model provides a steel construction amortization protection protective screen structure, it is convenient for carry out the modularization installation and dismantle at the job site, and the engineering is realized easily, and the construction is fast, the cost is low, can form effective enclosure to centrifugal oxygen compressor, can replace traditional reinforced concrete protective wall structure in the aspect of blast resistance intensity and heat safeguard function completely to possess splendid syllable-dividing noise reduction performance, have very big engineering application prospect.
2) The steel structure noise reduction protective screen described in the application breaks through the single reinforced concrete protective wall structure form of the existing conventional centrifugal oxygen compressor, adopts the steel structure protective screen convenient for modularized installation and disassembly, can bear the molten metal injection, fragment projection, overpressure and damage shock waves when the centrifugal oxygen compressor is exploded, ensures the life safety and equipment property safety of people around the centrifugal oxygen compressor, can isolate and absorb noise when the centrifugal oxygen compressor operates normally, and meets the requirements of the industrial enterprise sanitary and environment-friendly standards.
Drawings
Fig. 1 is a schematic view of an application place of the steel structure noise reduction protection barrier described in the present invention;
FIG. 2 is a sectional view taken along the line A-A of the steel structure noise-reduction protection barrier shown in FIG. 1;
wherein: the damping and protection device comprises 1-double-end stud, 2-rectangular steel pipe, 3-damping plate, 4-channel steel keel, 5-fiber reinforced calcium silicate fireproof plate, 6-carbon steel plate, 7-flame-retardant sound-absorbing cotton module, 8-polymer damping layer, 9-galvanized steel outer guard plate, 10-motor, 11-centrifugal oxygen compressor and 12-steel structure noise reduction and protection barrier.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example (b): compare FIGS. 1-2
The utility model provides a steel construction amortization protection protective screen structure for centrifugal oxygen compressor, steel construction amortization protection protective screen structure is equipped with a plurality of principal post nodes, and equal fixed mounting has amortization protection barrier layer between two adjacent principal post nodes, and the principal post node includes the steel pipe connection spare, wears to establish stud 1 on the steel pipe connection spare and sets up in the channel-section steel fossil fragments 4 of steel pipe connection spare side, the U-shaped opening of channel-section steel fossil fragments 4 sets up to the direction of steel pipe connection spare dorsad. The sound attenuation protective barrier layer comprises an outer protective layer, a sound attenuation layer, an inner protective layer and a fire-resistant layer, wherein the outer protective layer, the sound attenuation layer, the inner protective layer and the fire-resistant layer are sequentially arranged, and the polymer damping layer 8 is adhered to the inner surface of the sound attenuation protective barrier layer.
In the comparison of fig. 2, when a noise reduction protection barrier layer is installed between two adjacent main column nodes, a noise reduction layer is inserted between the U-shaped openings of the two channel steel keels 4 on the corresponding side surfaces of the two adjacent main column nodes, an inner protective layer and a fire-resistant layer are sequentially assembled on the noise reduction layer facing the inner side of the centrifugal oxygen compressor 11, and the end parts of the protective layer and the fire-resistant layer are locked and fixed on one side of the steel pipe connecting piece facing the centrifugal oxygen compressor through the stud 1 on the steel pipe connecting piece and the matched nut; an outer protective layer with a polymer damping layer 8 adhered on the inner surface is assembled on the outer side of the silencing layer back to the centrifugal oxygen press 11, and the end part of the outer protective layer is locked and fixed on one side of the steel pipe connecting piece back to the centrifugal oxygen press through a stud 1 on the steel pipe connecting piece and a matched nut.
The noise reduction layer is made of a flame-retardant sound absorption cotton module 7, and the flame-retardant sound absorption cotton module 7 is formed by compounding a polyester fiber cotton layer and a flame-retardant carbon fiber cotton layer, wherein the whole thickness of the polyester fiber cotton layer is 120-240 mm, and the porosity of the polyester fiber cotton layer is larger than or equal to 30%. The flame-retardant carbon fiber cotton layer mainly has a flame-retardant effect, so that flame ablation in accidents is reduced. The polyester fiber cotton layer mainly has the sound absorption effect; preferably, the density is more than or equal to 90kg/m3And the polyester fiber cotton layer with the sound absorption coefficient more than or equal to 0.6 (measured by a 250 Hz-500 Hz impedance tube method) can ensure good sound absorption effect.
The inner protective layer is a carbon steel plate 6, and the fire-resistant layer is a fiber reinforced calcium silicate fire-proof plate 5. The inner protective layer and the fire-resistant layer are composed of a carbon steel plate with the thickness of 4-6 mm and a fiber reinforced calcium silicate fire-resistant plate with the thickness of 20-25 mm, and the inner protective layer and the fire-resistant layer are assembled one by one in sequence until the sound-absorbing layer and the main column node are completely covered. The anti-explosion uniform load of the fiber-reinforced calcium silicate fireproof plate should be more than 2kN/m2And to ensure that it does not burn through within 30 seconds of being struck by the molten metal jet.
The outer protective layer is made of a galvanized steel outer protective plate 9, the high-molecular damping layer 8 is made of a 2-5 mm thick self-adhesive polyurethane resin, epoxy resin, acrylic resin, vinyl acetate resin and other high-internal-loss damping materials with a wide temperature range, and when alternating force fields such as vibration or noise are transmitted to the high-molecular damping layer with viscoelasticity, mechanical energy is partially converted into heat energy to be dissipated due to internal friction force among high-molecular chain segments, so that the damping effect of vibration and noise reduction is achieved. The polymer damping layer is directly adhered to the inner surface of the galvanized steel outer guard plate with the thickness of 2 mm.
In comparison with fig. 2, the steel pipe connector comprises two rectangular steel pipes 2, one channel steel keel 4 is welded and fixed on the short side surface of each rectangular steel pipe 2, and the two rectangular steel pipes 2 respectively welded with the channel steel keels 4 are combined in a crossed and staggered manner, so that two channel steel keels 4 are respectively arranged on two opposite sides of one steel pipe connector formed by combining the two rectangular steel pipes 2; the steel pipe connecting piece is characterized in that the damping plates 3 are attached to the long side surfaces of the two rectangular steel pipes 2 of the steel pipe connecting piece, two sets of studs 1 are arranged on the two rectangular steel pipes 2 and the damping plates 3 between the two rectangular steel pipes in a penetrating mode, namely, a main column node for installing a noise reduction protection barrier layer is formed, and the two sides of the main column node can be fixedly installed on the noise reduction protection barrier layer through the corresponding channel steel keels 4 and the studs 1. The width of the channel steel keel 4 is equal to or slightly less than the sum of the widths of the two rectangular steel pipes 2.
Fig. 2 is a top cross-sectional view of the steel structure noise reduction protective barrier 12, and it can be seen that two sets of studs 1 are arranged on a main column node, and in the actual use process, each set of studs 1 includes a row of multiple studs 1 arranged at intervals in the height direction of the rectangular steel pipe 2.
Wherein, channel-section steel fossil fragments 4 are the double-layered groove of barrier for fix a position and fixed fire-retardant type inhale the cotton module of sound. The steel channel keel preferably has the specification and model of 20a channel steel in comprehensive consideration of stability, safety and economy. The rectangular steel pipe is used as a bearing steel component of the barrier, the section specification of the rectangular steel pipe is enough to bear the whole weight of the barrier, and the height of the rectangular steel pipe is determined according to the highest position of the protected centrifugal oxygen compressor body. The preferable section specification of the rectangular steel pipe is 200mm (length) × 100mm (width) × 8mm (thickness) in consideration of stability, safety and economy.
A butyl rubber or nitrile rubber vibration damping plate with the thickness of 3-10 mm is additionally arranged between the two rectangular steel pipes 2, so that the low-frequency vibration of the oxygen compressor conducted to the steel structure barrier through the foundation is reduced, and further the effects of protecting each steel member of the barrier and limiting secondary noise sources are achieved.
In the outer protective layer, the noise reduction layer, the inner protective layer and the fire-resistant layer of the noise reduction protective barrier layer, the heights of all the layers are the same and are marked as the height of the barrier; the height of the rectangular steel pipe 2 and the height of the channel steel keel 4 are both equal to the height of the barrier. The height of the barrier is at least 0.6 m greater than the height of the highest point of the centrifugal oxygen compressor body to be protected by the barrier, and the height of the barrier is within the range of 2.5-4 m.
Example 1:
adopt the utility model discloses a certain empty project 20000Nm of steel construction amortization protection protective screen 12 that describes3Displacement per hourA core type oxygen compressor. After the centrifugal oxygen compressor shell and the motor 10 are installed, paying off is carried out on the periphery of the compressor platform, and the positions of the nodes of the main columns of the steel structure barriers are determined. The highest position of the centrifugal oxygen compressor body is about 1.8 meters higher than the operating platform, and the height of the barrier is determined to be 2.5 meters according to the height.
The rectangular steel pipe with the height of 2.5 meters and the length of 200mm multiplied by 100mm multiplied by 8mm and the width of 2.5 mm is selected, the short side face of the rectangular steel pipe is clung to the side face of the channel steel keel with the height of 2.5 meters (the specification of the channel steel keel selects No. 20a channel steel), and the rectangular steel pipe and the channel steel keel are welded by intermittent welding along the excircle corner of the rectangular steel pipe. The welding process is single-side fillet welding, the height of the welding seam is 6mm, the length of each section of welding seam is 100mm, and the interval between the welding seams is 200 mm. And assembling the welded rectangular steel pipe-channel steel keel assemblies in pairs, namely combining the two rectangular steel pipes 2 respectively welded with the channel steel keels 4 in a crossed staggered mode, adding a nitrile rubber vibration damping plate with the thickness of 5mm between the long side surfaces of the two rectangular steel pipes, and connecting the two groups of rectangular steel pipe-channel steel keel assemblies together by using a plurality of M24 double-end studs at a proper interval to form a main column node.
After each main column node is installed at a preset position, a flame-retardant sound-absorbing cotton module with the thickness of 160mm and the porosity of 30 percent is inserted between channel steel keels, and the module mainly comprises a module with the thickness of 100mm and the density of 120kg/m3The sound absorption coefficient of the composite material is 0.6, and the flame-retardant carbon fiber cotton layer with the thickness of 60 mm.
On the side of the noise reduction layer and the main column joint facing the centrifugal oxygen compressor, a carbon steel plate with the thickness of 4mm and an anti-explosion uniform load of 2.2kN/m with the thickness of 20mm are sequentially embedded by using double-end studs2The fiber-reinforced calcium silicate fireproof plate is fastened by adding nuts, and the fiber-reinforced calcium silicate fireproof plate is assembled block by block in sequence until the complete coverage protection of the sound damping layer and the main column node is realized.
And (3) assembling galvanized steel outer guard plates with the thickness of 2mm piece by using double-end studs sequentially on the outer sides of the noise reduction layer and the main column joint back to the centrifugal oxygen compressor, and fastening by adding nuts, wherein the inner sides of the galvanized steel outer guard plates are adhered with self-adhesive vinyl acetate resin damping layers with the thickness of 5 mm.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (8)
1. A steel structure silencing and protecting barrier structure for a centrifugal oxygen compressor is characterized in that the steel structure silencing and protecting barrier structure is provided with a plurality of main column nodes, a silencing and protecting barrier layer is fixedly arranged between every two adjacent main column nodes, and the silencing and protecting barrier layer comprises an outer protective layer, a silencing layer, an inner protective layer and a fire-resistant layer which are sequentially arranged, wherein the inner surface of the outer protective layer is adhered with a high-molecular damping layer (8); the main column node comprises a steel pipe connecting piece, a stud (1) penetrating through the steel pipe connecting piece and a channel steel keel (4) arranged on the side face of the steel pipe connecting piece, wherein a U-shaped opening of the channel steel keel (4) is arranged in a direction opposite to the direction of the steel pipe connecting piece;
when a silencing protection barrier layer is arranged between two adjacent main column nodes, a silencing layer is inserted between U-shaped openings of two channel steel keels (4) on the corresponding side surfaces of the two adjacent main column nodes, an inner protective layer and a fire-resistant layer are sequentially assembled on the silencing layer towards the inner side of the centrifugal oxygen compressor, and the end parts of the protective layer and the fire-resistant layer are locked and fixed on one side of the steel pipe connecting piece facing the centrifugal oxygen compressor through a stud (1) on the steel pipe connecting piece and a matched nut; an outer protective layer with a polymer damping layer (8) adhered on the inner surface is assembled on the outer side of the silencing layer back to the centrifugal oxygen press, and the end part of the outer protective layer is locked and fixed on one side of the steel pipe connecting piece back to the centrifugal oxygen press through a stud (1) on the steel pipe connecting piece and a matched nut.
2. The steel structure noise reduction and protection barrier structure for the centrifugal oxygen compressor as claimed in claim 1, wherein the noise reduction layer is made of flame-retardant sound absorption cotton module (7), and the flame-retardant sound absorption cotton module (7) is formed by attaching a polyester fiber cotton layer and a flame-retardant carbon fiber cotton layer.
3. A steel structural sound-deadening protective barrier structure for a centrifugal oxygen compressor as claimed in claim 1, wherein said inner protective layer is a carbon steel plate (6) and said fire-resistant layer is a fiber-reinforced calcium silicate fire-proof plate (5).
4. The steel structure noise reduction and protection barrier structure for the centrifugal oxygen compressor as claimed in claim 1, wherein the outer protection layer is a galvanized steel outer protection plate (9), and the polymer damping layer (8) is directly adhered to the inner surface of the galvanized steel outer protection plate (9).
5. The steel structure noise reduction and protection barrier structure for the centrifugal oxygen compressor as claimed in claim 1, wherein the steel pipe connecting piece comprises two rectangular steel pipes (2), one channel steel keel (4) is welded and fixed on the short side surface of each rectangular steel pipe (2), and the two rectangular steel pipes (2) welded with the channel steel keels (4) are combined in a cross-staggered mode, so that two channel steel keels (4) are respectively arranged on two opposite sides of one steel pipe connecting piece formed by combining the two rectangular steel pipes (2); the steel pipe connecting piece is characterized in that the damping plates (3) are attached to the long side surfaces of the two rectangular steel pipes (2) of the steel pipe connecting piece, two groups of studs (1) are arranged on the two rectangular steel pipes (2) and the damping plates (3) between the two rectangular steel pipes in a penetrating mode, namely, a main column node used for installing a noise reduction protection barrier layer is formed, and the two sides of the main column node can be fixedly installed on the noise reduction protection barrier layer through corresponding channel steel keels (4) and the studs (1).
6. A steel structure sound-deadening protective barrier structure for a centrifugal oxygen compressor as claimed in claim 5, characterized in that the width of the channel keel (4) is equal to or slightly less than the sum of the widths of the two rectangular steel pipes (2).
7. The steel structure noise reduction protection barrier structure for the centrifugal oxygen compressor as claimed in claim 5, wherein the outer protection layer, the noise reduction layer, the inner protection layer and the fire-resistant layer of the noise reduction protection barrier layer have the same height, and are marked as the height of the barrier; the height of the rectangular steel pipe (2) and the height of the channel steel keel (4) are equal to the height of the barrier.
8. The steel structure sound-deadening protective barrier structure for a centrifugal oxygen compressor as claimed in claim 7, wherein the height of the barrier is at least 0.6 m greater than the height of the highest point of the centrifugal oxygen compressor body which it protects, and the height of the barrier is in the range of 2.5-4 m.
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| CN202022762985.5U CN215054135U (en) | 2020-11-25 | 2020-11-25 | Steel structure noise reduction protection barrier structure for centrifugal oxygen compressor |
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