Vibration and noise reduction method for ship air duct

Abstract

The invention provides a vibration and noise reduction method for a ship air duct. The method comprises the steps that the surface of the air duct is pretreated; cutting the damping sound insulation board and the aerogel board; the surface of the air duct is covered with the damping sound insulation boards in an adhesive mode, and gaps between the adjacent damping sound insulation boards are filled after the damping sound insulation boards are installed; and the aerogel plate is bonded to the surface of the damping sound insulation plate, aluminum foil cloth is bonded to the surface of the aerogel plate after the aerogel plate is firmly bonded, and a seam of the aluminum foil cloth and a seam of the aerogel plate are staggered. By the adoption of the method, the purposes of vibration and noise reduction of the air pipe can be achieved, the long-term heat insulation performance of the pipeline can be guaranteed, and the method is suitable for various air conditioner ventilation system pipelines where people live or work.

Description

Technical Field

[0001] The invention relates to the field of vibration reduction and noise reduction for ships, and in particular to a method for vibration reduction and noise reduction of a ship air duct. Background Art

[0002] The ship's ventilation system is mainly used to supply fresh air from outside the ship, remove harmful gases and impurities in the ship, and stir the air between cabins to ensure the health of the crew. However, the ship's ventilation system will generate noise, and the sound can be transmitted to each cabin through the air duct, which will affect the daily life and work of the crew and have physiological and psychological effects and harm to the human body; in addition, the noise of the ship's ventilation system will directly threaten its concealment. Therefore, the noise control of the ventilation duct is particularly important, which directly determines the transmission range and area of ​​the noise. Therefore, when designing and manufacturing ship cabins, the noise level of the cabin needs to meet certain design requirements.

[0003] At present, in terms of noise control of air conditioning and ventilation systems, most of the current research focuses on the noise level control of components, such as compressors, fans, and silencers of piping systems. For example, in order to reduce the transmission and impact of airflow noise, it is usually necessary to add silencers to the ventilation ducts, increase the diameter of the ducts to reduce the wind speed of the ducts, avoid the cabin areas with high noise requirements, and thicken the duct walls. The above measures will increase the weight of the ducts and have high requirements for space layout. In addition, due to the difference in temperature between the ventilation ducts and the outside world, the gas in the ducts transfers heat to the environment, causing heat loss. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the related art, an object of the present invention is to provide a method for reducing vibration and noise of a ship air duct, so as to solve the above-mentioned problems.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for reducing vibration and noise of a ship wind duct, the method comprising the following steps: pre-treating the surface of the wind duct; cutting the damping sound insulation board and the aerogel board; bonding the damping sound insulation board to cover the surface of the wind duct, and filling the gap between adjacent damping sound insulation boards after the damping sound insulation board is installed; bonding the aerogel board to the surface of the damping sound insulation board, and pasting aluminum foil cloth on the surface of the aerogel board after the aerogel board is firmly bonded, and the joint of the aluminum foil cloth is staggered with the joint of the aerogel board.

[0006] Optionally, the step of pre-treating the surface of the air duct includes: cleaning the oil and grease on the surface of the air duct, and performing a grinding and roughening treatment on the surface of the air duct.

[0007] Optionally, the step of pre-treating the surface of the air duct further includes: if the surface of the air duct is painted, roughening the surface of the air duct while retaining the primer.

[0008] Optionally, the steps of cutting the damping sound insulation board and the aerogel board are: placing the damping sound insulation board on the surface of the air duct and drawing lines and staking out, cutting according to the positions of the staking out lines, and using the cut damping sound insulation board as a sample to cut the aerogel board.

[0009] Optionally, the step of bonding the damping sound insulation board to cover the surface of the air duct is: in an environment with a temperature of 15° C. to 35° C. and a relative air humidity of ≤85%, applying adhesive to the to-be-bonded portion of the air duct surface and the bonding surface of the damping sound insulation board, bonding the damping sound insulation board to the air duct and hitting the damping sound insulation board with a rubber hammer.

[0010] Optionally, two coats of adhesive are applied to the to-be-bonded portion of the duct surface and the bonding surface of the damping sound insulation board, and the second coat of adhesive is applied after the first coat of adhesive is touch-dried.

[0011] Optionally, when the damping sound insulation board is struck with a rubber hammer, the striking is performed layer by layer in the order from the middle to the surroundings.

[0012] Optionally, the step of bonding the aerogel sheet to the surface of the damping sound insulation sheet is: in an environment with a temperature of 15° C. to 35° C. and a relative air humidity of ≤85%, applying a layer of glue on the surface of the damping sound insulation sheet, attaching the aerogel sheet to the surface of the damping sound insulation sheet coated with glue, and fastening it with a cloth tape.

[0013] Optionally, the method further comprises the steps of: applying flame retardant white glue on the surface of the aluminum foil cloth, and sticking the cut flame retardant white cloth on the surface of the aluminum foil cloth and pressing and fitting them tightly.

[0014] Optionally, the method further comprises: after the flame retardant white cloth is coated, coating the surface of the flame retardant white cloth with a layer of latex paint.

[0015] As described above, the vibration reduction and noise reduction method of the ship air duct of the present invention has the following beneficial effects: the isolation and absorption of vibration and noise by the damping sound insulation board and the aerogel board effectively suppresses the conduction of vibration through the air duct and the bulkhead structure, and at the same time reduces the sound conduction energy, thereby achieving the purpose of vibration reduction and noise reduction of the air duct. At the same time, the aerogel board can reduce the heat conduction and heat radiation on the surface of the pipeline, so as to achieve the effect of heating the air supply pipeline in winter and the heat preservation and heat insulation of the refrigeration pipeline in summer. At the same time, the aluminum foil cloth on the surface of the aerogel board can avoid the breathing of the aerogel, avoid the condensation phenomenon caused by the temperature difference between the inside and the outside under the refrigeration condition in summer, and ensure the long-term heat insulation performance of the pipeline. The composite material composed of the damping sound insulation board, the aerogel board and the aluminum foil cloth in the present invention has the characteristics of low toxicity, sound insulation, heat insulation, sound absorption, low density and convenient construction, and the material has good ductility, bending and compressibility, which can ensure that the material fits closely with the surface of the air duct, and is suitable for the air conditioning and ventilation system pipelines where various personnel live or work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a flow chart of a method for reducing vibration and noise of a ship air duct in an embodiment of the present invention.

[0017] Figure 2 It shows a schematic diagram of an air duct treated by the ship air duct vibration reduction and noise reduction method in an embodiment of the present invention.

[0018] Component number description

[0019] 1. Air duct; 2. Adhesive; 3. Damping sound insulation board; 4. Sealing putty; 5. Glue; 6. Aerogel board; 7. Aluminum foil cloth; 8. Flame retardant white glue; 9. Flame retardant white cloth; 10. Latex paint. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0021] For example, when describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional view showing the device structure will not be partially enlarged according to the general scale, and the schematic view is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional space dimensions of length, width and depth should be included.

[0022] For ease of description, spatial relational terms such as "under", "below", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature shown in the drawings to other elements or features. It will be understood that these spatial relational terms are intended to include other directions of the device in use or operation in addition to the directions depicted in the drawings. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or there can be one or more intervening layers. As used herein, "between..." means including the end point values.

[0023] In the context of the present application, a structure in which a first feature is described as being "above" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0024] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, and therefore the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] like Figure 1 As shown, this embodiment discloses a method for reducing vibration and noise of a ship air duct, which is used to reduce the noise of a ventilation system. The steps of the method for reducing vibration and noise of a ship air duct include:

[0026] S1. Pre-treat the surface of the air duct 1.

[0027] The steps of pre-treating the surface of the air duct 1 are: cleaning the oil and grease on the surface of the air duct 1, and grinding and roughening the surface of the air duct 1. Specifically, first use a rag to wipe the dust on the surface of the air duct 1, and then use different pre-treatment methods according to the material of the air duct 1. If the air duct 1 is a stainless steel tube, use a cotton cloth dipped in acetone or alcohol to wipe off the oil and grease, and use sandpaper or emery cloth to grind and roughen it. If the surface of the air duct 1 is painted, for example, the carbon steel air duct 1 and the galvanized air duct 1 painted with paint, the surface of the air duct 1 is roughened while retaining the primer, that is, under the premise of retaining the primer, use 60# or 80# emery cloth to roughen the paint to form a certain degree of roughness, and then blow it clean with compressed air or use a clean cotton cloth to wipe off the dust. After the surface pre-treatment of the air duct 1 is completed, the air duct 1 is placed at room temperature to dry.

[0028] S2, cutting the damping sound insulation board 3 and the aerogel board 6.

[0029] Place the damping sound insulation board 3 on the surface of the air duct 1 and use a whiteboard pen or oil pen to mark and lay out the lines, and cut according to the position of the laid out lines. For example, for a conventional rectangular air duct 1, cut it according to the four sides respectively, and the cutting seams of the four sides should be flat. After cutting, it can be preliminarily combined on the outer surface of the air duct 1 to verify the correctness of the cutting.

[0030] The cut damping sound insulation board 3 is used as a sample to cut the aerogel board 6. After the cutting of the damping sound insulation board 3 and the aerogel board 6 is completed, the cut damping sound insulation board 3 and the aerogel board 6 are numbered and assembled in the order of the numbers.

[0031] In order to make the damping sound insulation board 3 firmly bonded to the air duct 1, the surface to be bonded of the damping sound insulation board 3 needs to be polished to make it rough. For example, a brush is used to remove the glue dust on the surface of the damping sound insulation board 3, and then the surface to be bonded of the damping sound insulation board 3 is wiped with clean cotton yarn to remove dust, grease and other pollutants. After the damping sound insulation board 3 is processed, the surfaces to be bonded of the two damping sound insulation boards 3 are placed opposite to each other or covered with a clean isolation cloth to prevent re-contamination.

[0032] The damping sound insulation board 3 of this embodiment has certain cross temperature resistance, seawater resistance, oil resistance, salt spray resistance, hot air aging resistance and mold resistance. The tensile strength of the damping sound insulation board 3 of this embodiment is ≥8MPa and the thickness is 5mm.

[0033] S3, bonding the damping sound insulation board 3 to cover the surface of the air duct 1, and filling the gaps between adjacent damping sound insulation boards 3 after the damping sound insulation boards 3 are installed.

[0034] Under the environment of temperature of 15°C to 35°C and relative air humidity ≤85%, the adhesive 2 is applied to the surface of the air duct 1 to be bonded and the bonding surface of the damping sound insulation board 3, the damping sound insulation board 3 is bonded to the air duct 1 and the damping sound insulation board 3 is struck with a rubber hammer.

[0035] Specifically, two layers of adhesive 2 are applied to the bonding area on the surface of the air duct 1 and the bonding surface of the damping sound insulation board 3. The second layer of adhesive is applied after the first layer of adhesive is touch-dried. It should be noted that the application of the adhesive must be kept uniform, and the bonding should be started from the outer edge of the air duct 1. The selected adhesive 2 has a bonding strength of ≥2MPa with the air duct 1 and is non-toxic or low-toxic and flame-retardant. The amount of adhesive 2 is about 1.0kg / m 2 The present embodiment adopts two gluing processes, which can avoid the problem of incomplete gluing, thereby preventing air from remaining between the air duct 1 and the damping sound insulation board 3, thereby avoiding affecting the effect of heat insulation and noise reduction.

[0036] The specific steps of using a rubber hammer to knock the damping sound insulation board 3 are as follows: when using a rubber hammer to knock the damping sound insulation board 3, a certain force must be ensured, and the knocking must be performed layer by layer from the middle to the surroundings. When knocking, it must be ensured that every part can be knocked, and the knocking force should be uniform and consistent. During the knocking process, the damping sound insulation board 3 should be supported to prevent the damping sound insulation board 3 from sliding, and the damping sound insulation board 3 should not be tilted or bulged. After the damping sound insulation board 3 on one side is pasted tightly, the damping sound insulation board 3 on the other side can be pasted.

[0037] After all the damping sound insulation panels 3 are bonded, clean the gaps between the damping sound insulation panels 3 to ensure that there is no oil or dust in the gaps. Weigh the two components of the sealing putty 4 according to the weight ratio of component A: component B = 2:1, mix and stir, and then apply and fill after the two components are fully mixed. Fill the sealing putty 4 into the gap with a scraper, then scrape it flat with a scraper, and then protect the construction site to prevent it from being contaminated by oil or dust.

[0038] After the putty is cured, the uneven parts are trimmed and polished to make the surface smooth. The amount of sealing putty 4 each time is preferably such that the construction can be completed within 30 minutes. The bonding strength of the sealing putty 4 used with the air duct 1 is ≥4MPa, and it has non-toxic or low-toxicity and flame retardant properties.

[0039] S4, bonding the aerogel sheet 6 to the surface of the damping sound insulation sheet 3, and after the aerogel sheet 6 is firmly bonded, pasting the aluminum foil cloth 7 on the surface of the aerogel sheet 6, with the seams of the aluminum foil cloth 7 and the joint seams of the aerogel sheet 6 being staggered.

[0040] First, the outer surface of the damping sound insulation board 3 is polished, and the polishing dust is blown off. This operation can make the damping sound insulation board 3 and the aerogel board 6 more firmly bonded. In an environment with a temperature of 15°C to 35°C and a relative humidity of ≤85%, a layer of glue 5 is applied on the surface of the damping sound insulation board 3, and the aerogel board 6 is attached to the surface of the damping sound insulation board 3 coated with glue 5, and tied with a cloth tape. The cloth tape should be tied for more than 24 hours to enhance the bonding force between the damping sound insulation board 3 and the aerogel board 6. Among them, the glue 5 has flame retardant properties.

[0041] In this embodiment, the volume density of the aerogel sheet 6 used is ≤220kg / m 3 , mass moisture absorption rate ≤3%, tensile strength ≥60KPa, thermal conductivity ≤0.04 (W / m·K), moisture resistance factor ≥1500, the aerogel sheet 6 is a non-flammable insulation material with low density, low thermal conductivity, non-toxicity and certain sound absorption effect.

[0042] The aluminum foil cloth 7 used has an air barrier effect, which isolates the aerogel sheet 6 from the outside air, avoids the breathing of the aerogel sheet 6, and avoids the phenomenon of condensation when there is a temperature difference between the inside and outside of the air duct 1. Since the joints of the aluminum foil cloth 7 and the joints of the aerogel sheet 6 are staggered, the aluminum foil cloth 7 can exert a certain restraining force on the aerogel sheet 6, making the aerogel sheet 6 more firmly installed.

[0043] S5. Apply flame retardant white glue 8 on the surface of the aluminum foil cloth 7, and stick the cut flame retardant white cloth 9 on the surface of the aluminum foil cloth 7 and press it tightly.

[0044] Specifically, the flame retardant white cloth 9 is cut according to the size of the construction surface, and the flame retardant white glue 8 is evenly applied on the surface of the aluminum foil cloth 7 with a brush at a temperature of 15°C to 35°C and an air relative humidity of ≤85%. When the surface of the flame retardant white glue 8 is slightly dry, the cut flame retardant white cloth 9 is attached to the surface of the aluminum foil cloth 7 and pressed tightly. The seams of the flame retardant white cloth 9 can be overlapped, and the overlap width is about 10mm. After the construction is completed, the flame retardant white cloth 9 is trimmed with scissors and the surface yarn ends are cut off. Among them, the flame retardant white cloth 9 can also be wrapped according to the shape of the air duct 1.

[0045] S6. After the flame retardant white cloth 9 is wrapped, a layer of latex paint 10 is applied to the surface of the flame retardant white cloth 9.

[0046] Specifically, after the flame retardant white cloth 9 is coated, a layer of latex paint 10 is coated on its surface, and the thickness of the latex paint 10 is about 50 μm. The color of the paint surface can be consistent with the color of the ship cabin environment.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for reducing vibration and noise of a ship air duct, characterized in that: The steps of the method include: Pre-treat the surface of the air duct; Cutting damping sound insulation panels and aerogel panels; Bond the damping sound insulation board to cover the surface of the air duct, and fill the gaps between adjacent damping sound insulation boards after the damping sound insulation boards are installed; The aerogel sheet is bonded to the surface of the damping sound insulation sheet, and after the aerogel sheet is firmly bonded, an aluminum foil cloth is pasted on the surface of the aerogel sheet, and the seam of the aluminum foil cloth is staggered with the joint seam of the aerogel sheet.

2. The method for reducing vibration and noise of a ship air duct according to claim 1, characterized in that: The step of pre-treating the surface of the air duct is: cleaning the oil and grease on the surface of the air duct, and grinding and roughening the surface of the air duct.

3. The method for reducing vibration and noise of a ship air duct according to claim 2, characterized in that: The step of pre-treating the surface of the air duct also includes: if the surface of the air duct is painted, roughening the surface of the air duct while retaining the primer.

4. The method for reducing vibration and noise of a ship air duct according to claim 1, characterized in that: The steps of cutting the damping sound insulation board and the aerogel board are: placing the damping sound insulation board on the surface of the air duct and drawing lines and setting out, cutting according to the positions of the set out lines, and using the cut damping sound insulation board as a sample to cut the aerogel board.

5. The method for reducing vibration and noise of a ship air duct according to claim 1, characterized in that: The step of bonding the damping sound insulation board to cover the surface of the air duct is: in an environment with a temperature of 15° C. to 35° C. and an air relative humidity of ≤85%, applying adhesive to the to-be-bonded portion of the air duct surface and the bonding surface of the damping sound insulation board, bonding the damping sound insulation board to the air duct and hitting the damping sound insulation board with a rubber hammer.

6. The method for reducing vibration and noise of a ship air duct according to claim 5, characterized in that: Apply two coats of adhesive to the bonding area on the surface of the duct and the bonding surface of the damping sound insulation board. Apply the second coat of adhesive after the first coat of adhesive is dry to the touch.

7. The method for reducing vibration and noise of a ship air duct according to claim 5, characterized in that: When the damping sound insulation board is struck with a rubber hammer, the strikes are performed layer by layer in the order from the middle to the surroundings.

8. The method for reducing vibration and noise of a ship air duct according to claim 1, characterized in that: The step of bonding the aerogel sheet to the surface of the damping sound insulation sheet is as follows: in an environment where the temperature is 15°C to 35°C and the relative humidity of the air is ≤85%, a layer of glue is applied on the surface of the damping sound insulation sheet, the aerogel sheet is attached to the surface of the damping sound insulation sheet coated with glue, and is fastened with a cloth tape.

9. The method for reducing vibration and noise of a ship air duct according to claim 1, characterized in that: The method further comprises the steps of: Apply flame retardant white glue on the surface of the aluminum foil cloth, stick the cut flame retardant white cloth on the surface of the aluminum foil cloth and press it tightly.

10. The method for reducing vibration and noise of a ship air duct according to claim 9, characterized in that: The method further comprises the steps of: after the flame retardant white cloth is coated, coating a layer of latex paint on the surface of the flame retardant white cloth.

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