EP3734071B1 - Noise & vibration reduction unit - Google Patents
Noise & vibration reduction unit Download PDFInfo
- Publication number
- EP3734071B1 EP3734071B1 EP19000203.0A EP19000203A EP3734071B1 EP 3734071 B1 EP3734071 B1 EP 3734071B1 EP 19000203 A EP19000203 A EP 19000203A EP 3734071 B1 EP3734071 B1 EP 3734071B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- noise
- vibration reduction
- reduction unit
- cancellation
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920005830 Polyurethane Foam Polymers 0.000 claims description 5
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/005—Pulsation and noise damping means with direct action on the fluid flow using absorptive materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0083—Pulsation and noise damping means using blow off silencers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/063—Sound absorbing materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
- F04C29/065—Noise dampening volumes, e.g. muffler chambers
Definitions
- the present invention relates to the field of equipment for the reduction of noise pollution. More particularly, it relates to equipment to reduce noise and vibrational pollution caused by compressors that are used to transfer air to apparatus' or an environment, such as to a waste suspension treatment apparatus or to a domestic fish pond respectively.
- Compressors are frequently used in domestic or small-scale industrial environments so as to produce a consistent flow of air to a given environment or apparatus.
- One such example of an environment / arrangement in which a compressor might be used is in the temporary residential sector, for providing air to a small-scale waste suspension treatment apparatus, thus facilitating aerobic microbial digestion.
- Such an apparatus can be used to service the waste disposal needs of a caravan or a series of caravans.
- the waste suspension treatment apparatus is often situated beneath the caravan, installed within a small hole in the ground, or within close proximity to a series of caravans and connected by way of a pipe network.
- Compressors of typical design known in the art vibrate strongly and produce a considerable amount of noise (circa 60-70 decibels). Accordingly, when a compressor is attached to such an apparatus in the above example, unwanted noise and vibrations are produced which can lead to localised noise pollution and discomfort to the inhabitants of the dwelling(s).
- Another example of an environment in which such compressors might be used is for domestic fish pond operation and maintenance.
- owners of a small domestic pond typically connect a compressor so as to facilitate aeration of the pond, improving the quality of the water for the species kept therein, as well as helping to prevent stagnation, mosquito breeding and debris build-up.
- high levels of noise pollution and vibrational disturbances are not desirable.
- a noise & vibration reduction unit comprising: elongate encasing body means, having first and second remote ends and provided with air inlet means and air outlet means; wherein said body means comprises a rigid shell means, defining an internal volume; characterised in that the internal volume is substantially filled by at least two cancellation media comprising acoustic foam, said cancellation media having different densities respectively.
- the air inlet means is situated adjacent the first end of said body means and the air outlet means is situated adjacent the second end of said body means.
- the cancellation media comprise an open cell polyurethane foam.
- the plurality of cancellation media are arranged in layers, each layer having a cylindrical profile to match the internal circumference of the elongate encasing body means, forming a resistance fit therein.
- each layer of cancellation medium possesses a Noise Reduction Coefficient (NRC) different to that of adjacent layer(s).
- NRC Noise Reduction Coefficient
- each layer of cancellation medium possesses a density different to that of the adjacent layer(s).
- each layer of cancellation medium possesses a Noise Reduction Coefficient (NRC) between 0.05 and 1.1 across a range of 100-5000Hz.
- NRC Noise Reduction Coefficient
- each layer of cancellation medium has a density between 0.75 and 0.95kg/m 3 .
- the layers of cancellation media are arranged sequentially from a high NRC grade or density to a low NRC grade or density.
- the layers of cancellation media are arranged sequentially from a first layer having a density between 0.85 and 0.95kg/m 3 , through to a final layer having a density between 0.75 and 0.85kg/m 3 .
- the first and second ends of the elongate encasing body means are domed in shape.
- the elongate encasing body means comprises a dome ended cylindrical container.
- the elongate encasing body means comprises a first encasing body section and a second encasing body section separable from the first.
- first and second encasing body sections are releasably attached to one another.
- the elongate encasing body means comprises either a rigid plastics material or resins.
- the noise & vibration reduction unit 101 is operatively connected at a first end 102 to an air compressor (indicated generally at 103) by way of a first length of tubing 104, and is further operatively connected at a second end 105 to a waste suspension treatment apparatus (indicated generally at 106) by way of a second length of tubing 107.
- the noise & vibration reduction unit 101 is arranged so as to be within 0.1 to 5.0 metres of the air compressor 103 so that it can appropriately act upon the noises and vibrations caused by such compressors 103 upstream of the apparatus 106.
- the waste suspension treatment apparatus 106 is situated further away from the noise & vibration reduction unit 101 than is the compressor 103. The specifics of the noise & vibration reduction unit 101 and the manner in which it achieves its intended function will be discussed later with respect to Figures 1b to 1d .
- Figure 1a depicts the noise & vibration reduction unit 101 in an environment where it is engaged with a waste suspension treatment apparatus 106 downstream, in an alternative environment, it may also be used for the same effect, but upstream of a domestic fish pond.
- the noise & vibration reduction unit 101 will still be operatively connected at its first end 102 to a compressor 103 by way of the first tubing 104, and it shall also be connected to the second tubing 107 at its second end 105.
- the second tubing 107 will instead run toward a domestic fish pond, where it shall be used for aeration of the pond water.
- the noise & vibration reduction unit 101 is operatively connected within 0.1 to 5.0 metres of such a compressor 103 by utilising an appropriate length of first tubing 104, so as to act upon it, reducing the noise and vibration produced both locally at the compressor 103 and further downstream at the subsequent piece of apparatus 106 or domestic fish pond that it is supplying air to.
- Figures 1b to Id are intended to assist in illustrating the general structure of the first noise & vibration reduction unit 101.
- the noise & vibration reduction unit is represented generally at 101.
- the unit 101 comprises an elongate encasing body (indicated generally at 108).
- the elongate encasing body 108 comprises a first encasing body section 109 and a second encasing body section 110 that are releasably attached to one another by way of fixings (indicated generally at 111, such as steel nut and bolt fixings).
- the first encasing body section 109 comprises a first connective flange 112 and the second encasing body section 110 comprises a second connective flange 113.
- connective flanges (112 & 113) extend the entire outer circumference of their respective encasing body section (109 & 110) and have a mutual profile, forming a flush airtight seal when brought together.
- Each connective flange (112 & 113) is provided with a plurality of apertures 114 distributed equally about their profile.
- Each said aperture 114 is dimensioned and adapted to receive a first component 115 of the fixings 111 (such as a steel bolt) therethrough, and for a second component 116 of such fixings 111 (such as a steel nut) to be operatively connected with the first 115 and tightened until the first and second encasing body sections (109 & 110) are brought together and form an airtight seal.
- a layer of sealant such as silicon sealant, may also be applied about the circumference of the seal between the two connective flanges.
- the first and second encasing body sections (109 & 110) each have a dome ended profile and upon releasable attachment to one-another, form a rigid and generally cylindrical elongate casing or shell (referred to herein as the elongate encasing body 108).
- the elongate encasing body 108 is further provided with an air inlet adaptor 117 and an air outlet adaptor 118.
- the air inlet adaptor 117 is situated adjacent a first end 119 of the encasing body 108 and the air outlet adaptor is situated adjacent a second end 120 of the encasing body 108 remote from the first 119. More particularly, the air inlet adaptor 117 is attached at the tip of the dome end of the first encasing body section 109, forming a pathway therethrough, and the air outlet adaptor 118 is attached at the tip of the dome end of the second encasing body section 110, forming a pathway from one remote end 119 to the other 120 of the elongate encasing body 108.
- the first length of tubing 104 (comprising typical flexible rubber hosing), having first and second ends, may be engaged with the compressor 103 at its first end, and may then be engaged with (pushed over) the air inlet adaptor 117 at its second end, forming an air tight pathway therethrough.
- the air inlet and outlet adaptors (117 & 118) are of typical design, allowing rubber tubing to be passed over them.
- the unit 101 is designed so as to be backcompatible with any compressor designed to be connected to a downstream entity via tubing.
- the second length of tubing 107 may then engage with (be pushed over) the air outlet adaptor 118 at its first end, and subsequently run a pre-determined distance (through adjusting its length) to appropriately situate its second end for connection to the aforementioned apparatus 106 or domestic pond outlet. Consequently, when the first and second encasing body sections (109 & 110) are releasably attached to one another, and the unit 101 is operatively connected to the compressor 103 and the downstream entity (either aforementioned apparats 106, domestic pond or other environment for delivery of air) by way of the first and second lengths of tubing (104 & 107), there is an airtight pathway formed through the unit 101. Said airtight pathway runs from the first end of the unit 119 to the second 120, with no observable escape of air pressure at the point at which where the first and second encasing body sections (109 & 110) are releasably brought together.
- the elongate encasing body 108 acts as a rigid shell, defining an internal volume for filling / occupation with a cancellation medium (indicated generally at 121 in Figure 1c ).
- the elongate encasing body 108 is substantially filled with open celled polyurethane foam. More particularly, it is filled with a specific form of open celled polyurethane foam that is known in the art as acoustic foam. Acoustic foam is used for acoustic treatment, attenuating soundwaves through increasing air pressure, thereby reducing the amplitude of the waves. Acoustic foams come in different grades, presenting with different densities and Noise Reduction Coefficients (NRCs), thereby altering the subsequent air pressure.
- NRCs Noise Reduction Coefficients
- a first cancellation medium 122 (a first grade of acoustic foam) and a second cancellation medium 123 (a second grade of acoustic foam) are employed.
- the first and second cancellation media (122 & 123) each present with NRCs ranging between 0.05 to 1.1 across a frequency range of 100Hz to 5000Hz and with densities between 10 and 100kg/m 3 .
- the preferred range of density of the first and second media 122 & 123 for utilisation in the present embodiment is within 75-95kg/m 3 .
- the first cancellation medium 122 presents with the highest density and NRC, preferably with density between 85-95kg/m 3 and average NRC across the 100-5000Hz range between 0.5 and 1.1.
- the second cancellation medium 123 presents with the lower density and NRC, preferably with density between 75-85kg/m 3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5.
- the acostic foam utilised is also fire retardant and complies to BS476 Part 6: Class O, and BS476 Part 7: Class1, UL94-HF1 and F.M.V.S.S 302.
- the first and second cancellation media (122 & 123) are longitudinally arranged in layers, one on top of the other as a repeating unit, extending the length and internal volume of the elongate encasing body 108. Accordingly, the substantial volume, if not entire volume, of the elongate encasing body 108 is filled with the first and second media (122 & 123). This occupation of the entire length and breadth of the unit 101 is further evidenced in the end-on sectional view of Figure Id, showing the transverse section of the first media 122 spanning the entire inner circumference of the encasing body 108.
- air passing through the elongate encasing body 108 fluctuates from a high air pressure to a low air pressure several times in accordance with the multitude of layers.
- the result of passing the air through the elongate encasing body 108 of the unit 101 (effectively as a cancellation chamber or silencer) is not complete soundproofing, but instead, significant nullification of sound and vibrations produced by the compressor 103.
- a compressor 103 is attached directly to the downstream entity (either aforementioned apparatus 106, domestic pond or other) by way of a single length of tubing, significant levels of noise and vibrational pollution are prevalent, both stemming from direct connection of the downstream entity to the compressor 103.
- the unit 101 when the unit 101 is arranged in between the compressor 103 and the downstream entity (either aforementioned apparatus 106, domestic pond or other), there is a reduction in the sound and vibrations produced by the compressor 103 locally, as well as a reduction in the sound waves and vibrations that are transmitted to the downstream entity and are detected locally at the entity.
- the unit 101 achieves a 55% reduction in the sound and vibrations produced by the compressor 103, as well as reducing levels of high frequency pitch.
- the unit 101 also reduces the sound and vibrations locally at the downstream apparatus 106 by 85%.
- the unit 101 has also produced the unexpected result of eliminating compressor 103 pulsations, which are typically observed in the art and otherwise lead to further irritation at the reverberating noise pollution.
- the unit 101 is arranged in series between the compressor 103 and the downstream entity, there is no observable build-up of back-pressure on the compressor 103, nor any observable change to the rate or quality of air output exhibited at the downstream entity (apparatus 106, domestic fish pond or other receiving environment of oxygen). Accordingly, the unit 101 reduces the noise and vibrational pollution to the environment that is otherwise caused by the compressor 103 whilst maintaining aeration and obviating any equipment issues at the compressor 103.
- the releasable attachment of the first and second encasing body sections (109 & 110) allows the user to open the unit 101 and access the contents within the elongate encasing body 108 for maintenance or exchange.
- the user may readily remove / exchange the grades of foam to achieve the levels of noise damping required, for tuneable noise damping.
- the unit 101 Whilst the releasable attachment of the first and second encasing body sections (109 & 110) is desirable, it shall be understood that the unit 101 would still function if it were irreversibly sealed, such as if it were welded. Accordingly, an alternative embodiment may not feature the releasable attachment of the first and second encasing body sections (109 & 110), and instead may see the elongate encasing body 108 of the unit 101 as a single piece of material, or still comprising the first and second encasing body sections (109 & 110) but that are irreversibly attached to one-another.
- the upstream end (119) of the first encasing body section 109 and the downstream end (120) of the second encasing body section 110 are each dome ended in profile, thereby giving a capsule shaped profile to the elongate encasing body 108 of the unit 101.
- This design has been selected as it helps to optimise the acoustic damping of the incoming soundwaves into the chamber, assisting the first and second cancellation media (122 & 123) in their role of attenuating sound waves.
- the first and second encasing body sections (109 & 110) each comprise rigid plastics or resin materials. Plastics or resins are utilised on account that such materials typically transmit vibrations that are imposed upon them less than metals, thereby further assisting the first and second cancellation media (122 & 123), and the elongate encasing body 108 as a whole, to reduce the vibrations that would otherwise be translated downstream.
- the elongate encasing body 108 of the unit 101 may comprise metals, being made up of first and second encasing body sections (109 & 110) that comprise metals (such as steel).
- the elongate encasing body 108 shown has dimensions in the range of 200-300mm length and 50-150mm width, with an internal diameter between 40 and 140mm, and is generally cylindrical with dome ends. It will be understood that the cancellation media 121 utilised within the apparatus 101 are appropriately dimensioned so as to substantially fill, if not entirely fill, the cavity / space provided within the elongate encasing body 108 and that the apparatus 101 can be scaled to accommodate various applications.
- Figure 2 illustrates the general structure of a second noise & vibration reduction unit 201 not covered by the present invention.
- the second noise & vibration reduction unit 201 comprises substantially identical features as previously noted for the first noise & vibration reduction unit 101, except for the nature of the noise cancellation medium that fills the internal volume of the elongate encasing body 108.
- the elongate encasing body 108 of the second noise & vibration reduction unit 201 is substantially filled with a single cancellation medium 202.
- the single cancellation medium 202 of the second noise & vibration reduction unit 201 comprises a single variety of open celled polyurethane acoustic foam. More particularly, the single cancellation medium 202 of the second noise & vibration reduction unit 201 comprises a single grade of acoustic foam.
- NRC Noise Reduction Coefficient
- a foam presenting with a NRC ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with a density between 10 and 100kg/m 3 is utilised in the present embodiment. More specifically, with a NRC ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz.
- the preferred range of density of the medium 202 for utilisation in the present embodiment is within 75-95kg/m 3 .
- it is preferred to use a foam towards the upper end of each of these ranges as it must compensate for the lack of damping that would otherwise be achieved through utilisation of two different grades of foam arranged in layers (as in the first unit 101).
- the second unit 201 comprises first and second encasing body sections (203 & 204 respectively) that may either be releasably or permanently attached to one-another.
- the user has the ability to open the elongate body 108 of the second unit 201 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by the unit 201.
- Figure 3 illustrates the general structure of a third noise & vibration reduction unit 301 embodying the present invention.
- the third noise & vibration reduction unit 301 comprises substantially identical features as previously noted for the first noise & vibration reduction unit 101, except for the nature of the noise cancellation medium that fills the internal volume of the elongate encasing body 108.
- the elongate encasing body 108 of the third noise & vibration reduction unit 301 is substantially filled with more than two forms of cancellation media.
- first 302, second 303, third 304 and fourth 305 cancellation media are present.
- the first to fourth cancellation media 302-305 of the third noise & vibration reduction unit 301 each comprise a single variety of open celled polyurethane acoustic foam. More particularly, the first to fourth cancellation media 302-305 of the third noise & vibration reduction unit 301 each comprise a single grade of acoustic foam.
- the highest grade of acoustic foam presenting with the highest density or highest Noise Reduction Coefficient (NRC)
- NRC Noise Reduction Coefficient
- the first through fourth cancellation media 302-305 each present with NRCs ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with densities between 10 and 100kg/m 3 . More specifically, with NRCs ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz.
- the preferred range of density of the first through fourth media 302-305 for utilisation in the present embodiment is within 75-95kg/m 3 .
- the first cancellation medium 302 presents with the highest density and NRC, preferably with density between 85-95kg/m 3 and average NRC across the 100-5000Hz range between 0.5 and 1.1.
- the last (fourth) cancellation medium 305 presents with the lowest density and NRC, preferably with density between 75-85kg/m 3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5.
- the second and third media 303 & 304 present with densities or NRCs within the between the ranges of the first 302 and fourth 305 media.
- the first through fourth cancellation media 302-305 are arranged in layers, extending longitudinally, one on top of the other as a repeating unit, extending the length and internal volume of the elongate encasing body 108. Accordingly, the substantial volume, if not entire volume, of the elongate encasing body 108 is filled with the first though fourth media 302-305. Accordingly, air passing through the elongate encasing body 108 fluctuates from a high air pressure to a low air pressure several times in accordance with the multitude of layers.
- the result of passing the air through the elongate encasing body 108 of the third unit 301 (effectively as a cancellation chamber or silencer) is not complete soundproofing, but instead, significant nullification of sound and vibrations produced by the compressor 103.
- the third unit 301 comprises first and second encasing body sections (306 & 307 respectively) that may either be releasably or permanently attached to one-another.
- the user has the ability to open the elongate body of the third unit 301 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by the unit 301.
- Figure 4 illustrates the general structure of a fourth noise & vibration reduction unit 401 embodying the present invention.
- the internal components of the unit 401 and the way in which these are different to the first.
- Second and third noise & vibration reduction units 101, 201 & 301 as previously noted.
- the fourth noise & vibration reduction unit 401 comprises substantially identical features as previously noted for the first noise & vibration reduction unit 101, with exception to the arrangement of the noise cancellation media that fills the internal volume of the elongate encasing body 108.
- the elongate encasing body 108 of the fourth noise & vibration reduction unit 401 is substantially filled with two forms of cancellation media.
- the first and second cancellation media (402 & 403) of the fourth noise & vibration reduction unit 401 each comprise a single variety of open celled polyurethane foam. More particularly, the first and second cancellation media (402 & 403) of the fourth noise & vibration reduction unit 401 each comprise a single grade of acoustic foam.
- the highest grade of acoustic foam presenting with the highest density or highest Noise Reduction Coefficient (NRC) is situated adjacent the air inlet adaptor 117, whilst the lowest grade acoustic foam, presenting with the lowest density or lowest NRC, is situated adjacent the air outlet adaptor 118.
- the first and second cancellation media (402 & 403) each present with NRCs ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with densities between 10 and 100kg/m 3 . More specifically, with NRCs ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz.
- the preferred range of density of the first and second media 402 & 403 for utilisation in the present embodiment is within 75-95kg/m 3 .
- the first cancellation medium 402 presents with the highest density and NRC, preferably with density between 85-95kg/m 3 and average NRC across the 100-5000Hz range between 0.5 and 1.1.
- the second cancellation medium 403 presents with the lower density and NRC, preferably with density between 75-85kg/m 3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5.
- the first and second cancellation media 402 & 403 extend the entire length and internal volume of the elongate encasing body 108.
- the substantial volume, if not entire volume, of the elongate encasing body 108 is filled with the first and second media 402 & 403.
- the fourth unit 401 only utilises a single layer of each foam 402 & 403 as opposed to repeated layers of the foam arranged on top of one another in series. Accordingly, air passing through the elongate encasing body 108 passes once from a high air pressure (high grade NRC) to a low air pressure (low grade NRC), resulting in the reduction of sound and vibrational disturbances produced by the compressor 103.
- the present embodiment provides an alternative unit 401 which would still lead to reduced levels of acoustic and vibrational disturbances caused by a compressor 103 in comparison to a compressor 103 that is used with no such unit 401.
- the fourth unit 401 comprises first and second encasing body sections (404 & 405 respectively) that may either be releasably or permanently attached to one-another.
- the user has the ability to open the elongate body of the fourth unit 401 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by the unit 401.
- the fourth unit 401 represents an embodiment where only two layers of foam are utilised (402 & 403) as a single layer, the same method of filling the unit 401 may be applied to the plurality of foam variant of unit 301. That is to say, the unit may alternatively comprise greater than two types of acoustic foam, such as three or more, but no repetition of the arrangement shall be observed, with the encasing body simply comprising one section of each variety of foam arranged on top of one-another.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Pipe Accessories (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Compressor (AREA)
Description
- The present invention relates to the field of equipment for the reduction of noise pollution. More particularly, it relates to equipment to reduce noise and vibrational pollution caused by compressors that are used to transfer air to apparatus' or an environment, such as to a waste suspension treatment apparatus or to a domestic fish pond respectively.
- Compressors are frequently used in domestic or small-scale industrial environments so as to produce a consistent flow of air to a given environment or apparatus. One such example of an environment / arrangement in which a compressor might be used is in the temporary residential sector, for providing air to a small-scale waste suspension treatment apparatus, thus facilitating aerobic microbial digestion. Such an apparatus can be used to service the waste disposal needs of a caravan or a series of caravans. In such an environment, the waste suspension treatment apparatus is often situated beneath the caravan, installed within a small hole in the ground, or within close proximity to a series of caravans and connected by way of a pipe network. Compressors of typical design known in the art vibrate strongly and produce a considerable amount of noise (circa 60-70 decibels). Accordingly, when a compressor is attached to such an apparatus in the above example, unwanted noise and vibrations are produced which can lead to localised noise pollution and discomfort to the inhabitants of the dwelling(s).
- Another example of an environment in which such compressors might be used is for domestic fish pond operation and maintenance. In such an example, owners of a small domestic pond typically connect a compressor so as to facilitate aeration of the pond, improving the quality of the water for the species kept therein, as well as helping to prevent stagnation, mosquito breeding and debris build-up. In the same manner as for the waste suspension treatment apparatus example, high levels of noise pollution and vibrational disturbances are not desirable.
- Current solutions for the above issues include encasing the compressor within an acoustic cancellation chamber or wrapping it in an acoustic blanket. The chamber provides a high degree of noise cancellation, but in a number of environments (including those noted above) there is not sufficient space to install such a chamber, or such a chamber adds an unnecessary level of cost and is unsightly. As for the acoustic blanket, such blankets do not resolve the issue of downstream vibrations and noises induced within apparatus, such as the aforementioned waste suspension treatment apparatus. Here in particular, even if the compressor were to be wrapped in an acoustic blanket, the vibrations caused by the compressor still arrive downstream at the apparatus, thus causing the entire apparatus to vibrate, causing noise pollution and vibrational disturbances.
- It has therefore been known for some time within the field that there is a need for a means by which the noise and vibrational pollution caused by such compressors may be significantly reduced, at a low cost and with minimal additional installation requirements. Document
US 2004/0126247 A1 discloses a sound and vibration unit which is attachable to an air compressor. - Accordingly, it is an object of the present invention to address and obviate the aforementioned issues known in the art. In particular, it is an object to provide a unit for the reduction of noise and vibrational disturbances caused by compressors, that is back compatible with existing compressors and is more readily installable than existing alternatives. It is further an object to provide such a unit that does not have a downstream effect on aeration or an upstream effect on back-pressure.
- According to the present invention, there is provided a noise & vibration reduction unit comprising: elongate encasing body means, having first and second remote ends and provided with air inlet means and air outlet means; wherein said body means comprises a rigid shell means, defining an internal volume; characterised in that the internal volume is substantially filled by at least two cancellation media comprising acoustic foam, said cancellation media having different densities respectively.
- Preferably, the air inlet means is situated adjacent the first end of said body means and the air outlet means is situated adjacent the second end of said body means.
- This allows passage of air from the first end of the unit through to the second end of the unit and out of said unit.
- Preferably, the cancellation media comprise an open cell polyurethane foam.
- More advantageously, the plurality of cancellation media are arranged in layers, each layer having a cylindrical profile to match the internal circumference of the elongate encasing body means, forming a resistance fit therein.
- Preferably, each layer of cancellation medium possesses a Noise Reduction Coefficient (NRC) different to that of adjacent layer(s).
- Preferably, each layer of cancellation medium possesses a density different to that of the adjacent layer(s).
- Preferably, each layer of cancellation medium possesses a Noise Reduction Coefficient (NRC) between 0.05 and 1.1 across a range of 100-5000Hz.
- Preferably, each layer of cancellation medium has a density between 0.75 and 0.95kg/m3.
- Advantageously, the layers of cancellation media are arranged sequentially from a high NRC grade or density to a low NRC grade or density.
- Most advantageously, the layers of cancellation media are arranged sequentially from a first layer having a density between 0.85 and 0.95kg/m3, through to a final layer having a density between 0.75 and 0.85kg/m3.
- Preferably, the first and second ends of the elongate encasing body means are domed in shape.
- More preferably, the elongate encasing body means comprises a dome ended cylindrical container.
- This assists the unit with passage of air therethrough and obviating back-pressure build up.
- Advantageously, the elongate encasing body means comprises a first encasing body section and a second encasing body section separable from the first.
- More advantageously, the first and second encasing body sections are releasably attached to one another.
- This allows the unit to be opened for maintenance and for selective exchange of layers of cancellation media.
- Preferably, the elongate encasing body means comprises either a rigid plastics material or resins.
- This provides improved vibrational damping to the unit.
- The invention will now be described by way of example only with reference to the accompanying drawings, which are purely schematic and not to scale, of which:
-
Figure 1a is a schematic illustration of a first noise & vibration reduction unit embodying the present inventionshown in use in a perspective view; -
Figure 1b is a plan view in isolation of the first noise & vibration reduction unit shown inFigure 1a ; -
Figure 1c is a cross-sectional plan view of the first noise & vibration reduction unit shown inFigure 1a , taken along line A-A; - Figure Id is a cross-sectional plan view of the first noise & vibration reduction unit shown in
Figure 1a , taken along line B-B; -
Figure 2 is a cross-sectional plan view of a second noise & vibration reduction unit not covered by the present invention; -
Figure 3 is a cross-sectional plan view of a third noise & vibration reduction unit embodying the present invention; and -
Figure 4 is a cross-sectional plan view of a fourth noise & vibration reduction unit embodying the present invention. - Referring now to the Figures, and to
Figure 1a in particular, an example of an environment in which a first noise & vibration reduction unit (indicated generally at 101) can be used is shown. The noise &vibration reduction unit 101 is operatively connected at afirst end 102 to an air compressor (indicated generally at 103) by way of a first length oftubing 104, and is further operatively connected at asecond end 105 to a waste suspension treatment apparatus (indicated generally at 106) by way of a second length oftubing 107. In such an environment, the noise &vibration reduction unit 101 is arranged so as to be within 0.1 to 5.0 metres of theair compressor 103 so that it can appropriately act upon the noises and vibrations caused bysuch compressors 103 upstream of theapparatus 106. In the example environment, the wastesuspension treatment apparatus 106 is situated further away from the noise &vibration reduction unit 101 than is thecompressor 103. The specifics of the noise &vibration reduction unit 101 and the manner in which it achieves its intended function will be discussed later with respect toFigures 1b to 1d . - It shall be understood that whilst
Figure 1a depicts the noise &vibration reduction unit 101 in an environment where it is engaged with a wastesuspension treatment apparatus 106 downstream, in an alternative environment, it may also be used for the same effect, but upstream of a domestic fish pond. In such an environment, the noise &vibration reduction unit 101 will still be operatively connected at itsfirst end 102 to acompressor 103 by way of thefirst tubing 104, and it shall also be connected to thesecond tubing 107 at itssecond end 105. However, thesecond tubing 107 will instead run toward a domestic fish pond, where it shall be used for aeration of the pond water. - In both aforementioned environments, the noise and vibrations caused by
compressors 103 that are known in the art are disturbing to and, in some instances, destructive to local ecosystems. Accordingly, the noise &vibration reduction unit 101 is operatively connected within 0.1 to 5.0 metres of such acompressor 103 by utilising an appropriate length offirst tubing 104, so as to act upon it, reducing the noise and vibration produced both locally at thecompressor 103 and further downstream at the subsequent piece ofapparatus 106 or domestic fish pond that it is supplying air to. -
Figures 1b to Id are intended to assist in illustrating the general structure of the first noise &vibration reduction unit 101. In particular, the internal and external components of theunit 101 and the way in which these achieve the desired technical effect of significantly reducing noise and vibrational disturbances locally at thecompressor 103 and further downstream at the point where air is delivered via the second length oftubing 107. - The noise & vibration reduction unit is represented generally at 101. The
unit 101 comprises an elongate encasing body (indicated generally at 108). Theelongate encasing body 108 comprises a firstencasing body section 109 and a secondencasing body section 110 that are releasably attached to one another by way of fixings (indicated generally at 111, such as steel nut and bolt fixings). The firstencasing body section 109 comprises a firstconnective flange 112 and the secondencasing body section 110 comprises a secondconnective flange 113. These connective flanges (112 & 113) extend the entire outer circumference of their respective encasing body section (109 & 110) and have a mutual profile, forming a flush airtight seal when brought together. Each connective flange (112 & 113) is provided with a plurality ofapertures 114 distributed equally about their profile. Each saidaperture 114 is dimensioned and adapted to receive afirst component 115 of the fixings 111 (such as a steel bolt) therethrough, and for asecond component 116 of such fixings 111 (such as a steel nut) to be operatively connected with the first 115 and tightened until the first and second encasing body sections (109 & 110) are brought together and form an airtight seal. A layer of sealant, such as silicon sealant, may also be applied about the circumference of the seal between the two connective flanges. The first and second encasing body sections (109 & 110) each have a dome ended profile and upon releasable attachment to one-another, form a rigid and generally cylindrical elongate casing or shell (referred to herein as the elongate encasing body 108). - The
elongate encasing body 108 is further provided with anair inlet adaptor 117 and anair outlet adaptor 118. Theair inlet adaptor 117 is situated adjacent afirst end 119 of theencasing body 108 and the air outlet adaptor is situated adjacent asecond end 120 of theencasing body 108 remote from the first 119. More particularly, theair inlet adaptor 117 is attached at the tip of the dome end of the firstencasing body section 109, forming a pathway therethrough, and theair outlet adaptor 118 is attached at the tip of the dome end of the secondencasing body section 110, forming a pathway from oneremote end 119 to the other 120 of theelongate encasing body 108. Accordingly, the first length of tubing 104 (comprising typical flexible rubber hosing), having first and second ends, may be engaged with thecompressor 103 at its first end, and may then be engaged with (pushed over) theair inlet adaptor 117 at its second end, forming an air tight pathway therethrough. The air inlet and outlet adaptors (117 & 118) are of typical design, allowing rubber tubing to be passed over them. Accordingly, theunit 101 is designed so as to be backcompatible with any compressor designed to be connected to a downstream entity via tubing. - The second length of
tubing 107, also having first and second ends, may then engage with (be pushed over) theair outlet adaptor 118 at its first end, and subsequently run a pre-determined distance (through adjusting its length) to appropriately situate its second end for connection to theaforementioned apparatus 106 or domestic pond outlet. Consequently, when the first and second encasing body sections (109 & 110) are releasably attached to one another, and theunit 101 is operatively connected to thecompressor 103 and the downstream entity (eitheraforementioned apparats 106, domestic pond or other environment for delivery of air) by way of the first and second lengths of tubing (104 & 107), there is an airtight pathway formed through theunit 101. Said airtight pathway runs from the first end of theunit 119 to the second 120, with no observable escape of air pressure at the point at which where the first and second encasing body sections (109 & 110) are releasably brought together. - The
elongate encasing body 108 acts as a rigid shell, defining an internal volume for filling / occupation with a cancellation medium (indicated generally at 121 inFigure 1c ). In this embodiment, theelongate encasing body 108 is substantially filled with open celled polyurethane foam. More particularly, it is filled with a specific form of open celled polyurethane foam that is known in the art as acoustic foam. Acoustic foam is used for acoustic treatment, attenuating soundwaves through increasing air pressure, thereby reducing the amplitude of the waves. Acoustic foams come in different grades, presenting with different densities and Noise Reduction Coefficients (NRCs), thereby altering the subsequent air pressure. In the present embodiment, a first cancellation medium 122 (a first grade of acoustic foam) and a second cancellation medium 123 (a second grade of acoustic foam) are employed. The higher grade of acoustic foam, presenting with the higher NRC or higher density, is situated adjacent theair inlet adaptor 117, whilst the lower grade acoustic foam, presenting with the lower NRC or lower density, is situated adjacent theair outlet adaptor 118. The first and second cancellation media (122 & 123) each present with NRCs ranging between 0.05 to 1.1 across a frequency range of 100Hz to 5000Hz and with densities between 10 and 100kg/m3. More specifically, with NRCs ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz. The preferred range of density of the first andsecond media 122 & 123 for utilisation in the present embodiment is within 75-95kg/m3. As noted, thefirst cancellation medium 122 presents with the highest density and NRC, preferably with density between 85-95kg/m3 and average NRC across the 100-5000Hz range between 0.5 and 1.1. As noted, thesecond cancellation medium 123 presents with the lower density and NRC, preferably with density between 75-85kg/m3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5. The acostic foam utilised is also fire retardant and complies to BS476 Part 6: Class O, and BS476 Part 7: Class1, UL94-HF1 and F.M.V.S.S 302. - In the present embodiment, the first and second cancellation media (122 & 123) are longitudinally arranged in layers, one on top of the other as a repeating unit, extending the length and internal volume of the
elongate encasing body 108. Accordingly, the substantial volume, if not entire volume, of theelongate encasing body 108 is filled with the first and second media (122 & 123). This occupation of the entire length and breadth of theunit 101 is further evidenced in the end-on sectional view of Figure Id, showing the transverse section of thefirst media 122 spanning the entire inner circumference of theencasing body 108. Accordingly, air passing through theelongate encasing body 108 fluctuates from a high air pressure to a low air pressure several times in accordance with the multitude of layers. The result of passing the air through theelongate encasing body 108 of the unit 101 (effectively as a cancellation chamber or silencer) is not complete soundproofing, but instead, significant nullification of sound and vibrations produced by thecompressor 103. - In this regard, if a
compressor 103 is attached directly to the downstream entity (eitheraforementioned apparatus 106, domestic pond or other) by way of a single length of tubing, significant levels of noise and vibrational pollution are prevalent, both stemming from direct connection of the downstream entity to thecompressor 103. However, when theunit 101 is arranged in between thecompressor 103 and the downstream entity (eitheraforementioned apparatus 106, domestic pond or other), there is a reduction in the sound and vibrations produced by thecompressor 103 locally, as well as a reduction in the sound waves and vibrations that are transmitted to the downstream entity and are detected locally at the entity. In particular, theunit 101 achieves a 55% reduction in the sound and vibrations produced by thecompressor 103, as well as reducing levels of high frequency pitch. Theunit 101 also reduces the sound and vibrations locally at thedownstream apparatus 106 by 85%. Theunit 101 has also produced the unexpected result of eliminatingcompressor 103 pulsations, which are typically observed in the art and otherwise lead to further irritation at the reverberating noise pollution. When theunit 101 is arranged in series between thecompressor 103 and the downstream entity, there is no observable build-up of back-pressure on thecompressor 103, nor any observable change to the rate or quality of air output exhibited at the downstream entity (apparatus 106, domestic fish pond or other receiving environment of oxygen). Accordingly, theunit 101 reduces the noise and vibrational pollution to the environment that is otherwise caused by thecompressor 103 whilst maintaining aeration and obviating any equipment issues at thecompressor 103. - It shall be understood that whilst the present embodiment utilises two grades of acoustic foam (first and
second media 122 & 123), in alternative embodiments (described with reference tofigures 2 through 4 ) either a single grade of foam may be used to fill thechamber 108, or three or more different grades. The embodiment ofFigure 1 is the preferred arrangement, as it achieves greater damping of sound and vibrational pollution than when using a single grade of acoustic foam, but it is cheaper to produce and more readily manufactured / maintained than the model with three or more foams. That being said, the releasable attachment of the first and second encasing body sections (109 & 110) allows the user to open theunit 101 and access the contents within theelongate encasing body 108 for maintenance or exchange. In this regard, even if theunit 101 is sold with a single grade of foam, two grades or multiple grades, the user may readily remove / exchange the grades of foam to achieve the levels of noise damping required, for tuneable noise damping. - Whilst the releasable attachment of the first and second encasing body sections (109 & 110) is desirable, it shall be understood that the
unit 101 would still function if it were irreversibly sealed, such as if it were welded. Accordingly, an alternative embodiment may not feature the releasable attachment of the first and second encasing body sections (109 & 110), and instead may see theelongate encasing body 108 of theunit 101 as a single piece of material, or still comprising the first and second encasing body sections (109 & 110) but that are irreversibly attached to one-another. - The upstream end (119) of the first
encasing body section 109 and the downstream end (120) of the secondencasing body section 110 are each dome ended in profile, thereby giving a capsule shaped profile to theelongate encasing body 108 of theunit 101. This design has been selected as it helps to optimise the acoustic damping of the incoming soundwaves into the chamber, assisting the first and second cancellation media (122 & 123) in their role of attenuating sound waves. - The first and second encasing body sections (109 & 110) each comprise rigid plastics or resin materials. Plastics or resins are utilised on account that such materials typically transmit vibrations that are imposed upon them less than metals, thereby further assisting the first and second cancellation media (122 & 123), and the
elongate encasing body 108 as a whole, to reduce the vibrations that would otherwise be translated downstream. However, in alternative embodiments, theelongate encasing body 108 of theunit 101 may comprise metals, being made up of first and second encasing body sections (109 & 110) that comprise metals (such as steel). Theelongate encasing body 108 shown has dimensions in the range of 200-300mm length and 50-150mm width, with an internal diameter between 40 and 140mm, and is generally cylindrical with dome ends. It will be understood that thecancellation media 121 utilised within theapparatus 101 are appropriately dimensioned so as to substantially fill, if not entirely fill, the cavity / space provided within theelongate encasing body 108 and that theapparatus 101 can be scaled to accommodate various applications. -
Figure 2 illustrates the general structure of a second noise &vibration reduction unit 201 not covered by the present invention. In particular, the internal components of theunit 201 and the way in which these are different to those of the first noise &vibration reduction unit 101 as previously noted. - The second noise &
vibration reduction unit 201 comprises substantially identical features as previously noted for the first noise &vibration reduction unit 101, except for the nature of the noise cancellation medium that fills the internal volume of theelongate encasing body 108. In particular, theelongate encasing body 108 of the second noise &vibration reduction unit 201 is substantially filled with asingle cancellation medium 202. Thesingle cancellation medium 202 of the second noise &vibration reduction unit 201 comprises a single variety of open celled polyurethane acoustic foam. More particularly, thesingle cancellation medium 202 of the second noise &vibration reduction unit 201 comprises a single grade of acoustic foam. - As previously noted, greater levels of acoustic damping are achieved with higher grade Noise Reduction Coefficient (NRC) bearing acoustic foams, i.e. foams with a greater density. A foam presenting with a NRC ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with a density between 10 and 100kg/m3 is utilised in the present embodiment. More specifically, with a NRC ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz. The preferred range of density of the medium 202 for utilisation in the present embodiment is within 75-95kg/m3. Moreover, it is preferred to use a foam towards the upper end of each of these ranges as it must compensate for the lack of damping that would otherwise be achieved through utilisation of two different grades of foam arranged in layers (as in the first unit 101).
- It shall be understood that, much the same as the
first unit 101, thesecond unit 201 comprises first and second encasing body sections (203 & 204 respectively) that may either be releasably or permanently attached to one-another. In the releasable attachment variation, the user has the ability to open theelongate body 108 of thesecond unit 201 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by theunit 201. -
Figure 3 illustrates the general structure of a third noise &vibration reduction unit 301 embodying the present invention. In particular, the internal components of theunit 301 and the way in which these are different to those of the first and second noise &vibration reduction units 101 & 201 as previously noted. - The third noise &
vibration reduction unit 301 comprises substantially identical features as previously noted for the first noise &vibration reduction unit 101, except for the nature of the noise cancellation medium that fills the internal volume of theelongate encasing body 108. In particular, theelongate encasing body 108 of the third noise &vibration reduction unit 301 is substantially filled with more than two forms of cancellation media. In the depicted embodiment of thethird unit 301, first 302, second 303, third 304 and fourth 305 cancellation media are present. The first to fourth cancellation media 302-305 of the third noise &vibration reduction unit 301 each comprise a single variety of open celled polyurethane acoustic foam. More particularly, the first to fourth cancellation media 302-305 of the third noise &vibration reduction unit 301 each comprise a single grade of acoustic foam. - The highest grade of acoustic foam, presenting with the highest density or highest Noise Reduction Coefficient (NRC), is situated adjacent the
air inlet adaptor 117, whilst the lowest grade acoustic foam, presenting with the lowest density or lowest NRC, is situated adjacent theair outlet adaptor 118. - The first through fourth cancellation media 302-305 each present with NRCs ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with densities between 10 and 100kg/m3. More specifically, with NRCs ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz. The preferred range of density of the first through fourth media 302-305 for utilisation in the present embodiment is within 75-95kg/m3. As noted, the
first cancellation medium 302 presents with the highest density and NRC, preferably with density between 85-95kg/m3 and average NRC across the 100-5000Hz range between 0.5 and 1.1. As noted, the last (fourth)cancellation medium 305 presents with the lowest density and NRC, preferably with density between 75-85kg/m3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5. The second andthird media 303 & 304 present with densities or NRCs within the between the ranges of the first 302 and fourth 305 media. - In the embodiment shown in
Figure 3 , the first through fourth cancellation media 302-305 are arranged in layers, extending longitudinally, one on top of the other as a repeating unit, extending the length and internal volume of theelongate encasing body 108. Accordingly, the substantial volume, if not entire volume, of theelongate encasing body 108 is filled with the first though fourth media 302-305. Accordingly, air passing through theelongate encasing body 108 fluctuates from a high air pressure to a low air pressure several times in accordance with the multitude of layers. The result of passing the air through theelongate encasing body 108 of the third unit 301 (effectively as a cancellation chamber or silencer) is not complete soundproofing, but instead, significant nullification of sound and vibrations produced by thecompressor 103. - It shall be understood that, much the same as the
first unit 101, thethird unit 301 comprises first and second encasing body sections (306 & 307 respectively) that may either be releasably or permanently attached to one-another. In the releasable attachment variation, the user has the ability to open the elongate body of thethird unit 301 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by theunit 301. -
Figure 4 illustrates the general structure of a fourth noise &vibration reduction unit 401 embodying the present invention. In particular, the internal components of theunit 401 and the way in which these are different to the first. Second and third noise &vibration reduction units - The fourth noise &
vibration reduction unit 401 comprises substantially identical features as previously noted for the first noise &vibration reduction unit 101, with exception to the arrangement of the noise cancellation media that fills the internal volume of theelongate encasing body 108. In particular, theelongate encasing body 108 of the fourth noise &vibration reduction unit 401 is substantially filled with two forms of cancellation media. In the depicted embodiment of thefourth unit 401, there are represented first and second cancellation media (402 & 403 respectively). The first and second cancellation media (402 & 403) of the fourth noise &vibration reduction unit 401 each comprise a single variety of open celled polyurethane foam. More particularly, the first and second cancellation media (402 & 403) of the fourth noise &vibration reduction unit 401 each comprise a single grade of acoustic foam. - The highest grade of acoustic foam, presenting with the highest density or highest Noise Reduction Coefficient (NRC), is situated adjacent the
air inlet adaptor 117, whilst the lowest grade acoustic foam, presenting with the lowest density or lowest NRC, is situated adjacent theair outlet adaptor 118. The first and second cancellation media (402 & 403) each present with NRCs ranging between 0.05 to 1.1 across 100Hz to 5000Hz and with densities between 10 and 100kg/m3. More specifically, with NRCs ranging between; 0.1 and 0.2 across 100-200Hz; 0.2 to 0.4 across 200-400Hz; 0.4 to 0.7 across 400-1000Hz; 0.7 to 1.0 across 1000-4000Hz; and 1.0 to 1.1 across 4000-5000Hz. The preferred range of density of the first andsecond media 402 & 403 for utilisation in the present embodiment is within 75-95kg/m3. As noted, thefirst cancellation medium 402 presents with the highest density and NRC, preferably with density between 85-95kg/m3 and average NRC across the 100-5000Hz range between 0.5 and 1.1. As noted, thesecond cancellation medium 403 presents with the lower density and NRC, preferably with density between 75-85kg/m3 and an average NRC across the 100-5000Hz range between 0.05 and 0.5. - In the present embodiment, the first and
second cancellation media 402 & 403 extend the entire length and internal volume of theelongate encasing body 108. - Accordingly, the substantial volume, if not entire volume, of the
elongate encasing body 108 is filled with the first andsecond media 402 & 403. However, unlike the first noise &vibration reduction unit 101, thefourth unit 401 only utilises a single layer of eachfoam 402 & 403 as opposed to repeated layers of the foam arranged on top of one another in series. Accordingly, air passing through theelongate encasing body 108 passes once from a high air pressure (high grade NRC) to a low air pressure (low grade NRC), resulting in the reduction of sound and vibrational disturbances produced by thecompressor 103. - It is preferred to fill the
encasing body 108 with alternating layers of the foams (as per the first unit 101) as it is believed that this achieves greater levels of acoustic and vibrational damping. However, it will be appreciated that the present embodiment provides analternative unit 401 which would still lead to reduced levels of acoustic and vibrational disturbances caused by acompressor 103 in comparison to acompressor 103 that is used with nosuch unit 401. - It shall be understood that, much the same as the
first unit 101, thefourth unit 401 comprises first and second encasing body sections (404 & 405 respectively) that may either be releasably or permanently attached to one-another. In the releasable attachment variation, the user has the ability to open the elongate body of thefourth unit 401 and exchange the foam found therein, either for maintenance or for alteration of the properties exhibited by theunit 401. - It shall also be understood that whilst the
fourth unit 401 represents an embodiment where only two layers of foam are utilised (402 & 403) as a single layer, the same method of filling theunit 401 may be applied to the plurality of foam variant ofunit 301. That is to say, the unit may alternatively comprise greater than two types of acoustic foam, such as three or more, but no repetition of the arrangement shall be observed, with the encasing body simply comprising one section of each variety of foam arranged on top of one-another.
Claims (14)
- A noise & vibration reduction unit (101) comprising:elongate encasing body means (108), having first (119) and second remote ends (120) and provided with air inlet means (117) and air outlet means (118); whereinsaid body means (108) comprises a rigid shell, defining an internal volume;characterised in thatthe body means is substantially filled by at least two cancellation media (122, 123) comprising acoustic foam, said cancellation media (122, 123) having different densities respectively.
- The noise & vibration reduction unit of claim 1, wherein the air inlet means (117) is situated adjacent the first end (119) of said body means (108) and the air outlet means (118) is situated adjacent the second end (120) of said body means (108).
- The noise & vibration reduction unit of either claim 1 or claim 2, wherein the cancellation media (122, 123) comprise open cell polyurethane foam.
- The noise & vibration reduction unit of any preceding claim, wherein the or each at least two cancellation media (122, 123) together extend from adjacent the first end (119) of the body means (108) to adjacent the second end (120) of the body means (108).
- The noise & vibration reduction unit of claim 4, wherein the or each at least two cancellation media (122, 123) are arranged in layers, each layer extending transversely to a longitudinal axis of the elongate body means (108).
- The noise & vibration reduction unit of claim 5, wherein each layer of cancellation media (122, 123) possesses a Noise Reduction Coefficient (NRC) different to that of each layer adjacent thereto.
- The noise & vibration reduction unit of claim 6, wherein each layer of cancellation media (122, 123) possesses a Noise Reduction Coefficient (NRC) between 0.05 and 1.1 across a spectrum of 100-5000Hz.
- The noise & vibration reduction unit of any one of claims 5 to 7, wherein each layer of cancellation media (122, 123) possesses a density different to that of each layer adjacent thereto.
- The noise & vibration reduction unit any one of claims 5 to 8, wherein each layer of cancellation media (122, 123) has a density between 0.75 and 0.95kg/m3.
- The noise & vibration reduction unit of any one of claims 5 to 9, wherein the layers of cancellation media (122, 123) are arranged sequentially from a high density to a low density.
- The noise & vibration reduction unit of claim 10, wherein the layers of cancellation media (122, 123) are arranged sequentially from a first layer (122) having a density between 0.85 and 0.95kg/m3, through to a final layer (123) having a density between 0.75 and 0.85kg/m3.
- The noise & vibration reduction unit of any preceding claim, wherein the elongate encasing body means (108) comprises a first encasing body section (109) and a second encasing body section (110).
- The noise & vibration reduction unit of claim 12, wherein the first and second encasing body sections (109 & 110) are releasably attached to one another.
- The noise & vibration reduction unit of any preceding claim, wherein the elongate encasing body means (108) comprises either a rigid plastics material or a resin.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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ES19000203T ES2910517T3 (en) | 2019-04-29 | 2019-04-29 | Noise and vibration reduction unit |
EP19000203.0A EP3734071B1 (en) | 2019-04-29 | 2019-04-29 | Noise & vibration reduction unit |
PT190002030T PT3734071T (en) | 2019-04-29 | 2019-04-29 | Noise & vibration reduction unit |
CY20221100237T CY1125565T1 (en) | 2019-04-29 | 2022-03-24 | NOISE AND VIBRATION REDUCTION UNIT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP19000203.0A EP3734071B1 (en) | 2019-04-29 | 2019-04-29 | Noise & vibration reduction unit |
Publications (2)
Publication Number | Publication Date |
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EP3734071A1 EP3734071A1 (en) | 2020-11-04 |
EP3734071B1 true EP3734071B1 (en) | 2022-03-16 |
Family
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Application Number | Title | Priority Date | Filing Date |
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EP19000203.0A Active EP3734071B1 (en) | 2019-04-29 | 2019-04-29 | Noise & vibration reduction unit |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3734071B1 (en) |
CY (1) | CY1125565T1 (en) |
ES (1) | ES2910517T3 (en) |
PT (1) | PT3734071T (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114941617B (en) * | 2022-05-20 | 2023-09-08 | 吉能国际能源有限公司 | Air compressor device capable of actively reducing noise and noise reduction method thereof |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN204783543U (en) * | 2015-07-09 | 2015-11-18 | 重庆美的通用制冷设备有限公司 | A sound proof box and compressor unit spare for compressor |
CN109210757A (en) * | 2018-10-23 | 2019-01-15 | 珠海格力电器股份有限公司 | Soundproof cotton containing multiple layers of sound absorbing materials and compressor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3698510A (en) * | 1971-08-04 | 1972-10-17 | Blatt Leland F | Safety silencer air nozzle |
DE2342154C3 (en) * | 1973-08-21 | 1978-10-12 | Purolator Filter Gmbh, 7110 Oehringen | Noise-reducing air intake filter |
DE2516626C2 (en) * | 1975-04-16 | 1977-04-28 | Freudenberg Carl Fa | SILENCER FOR EMISSING COMPRESSED GASES |
DE10248183A1 (en) * | 2002-10-16 | 2004-04-29 | Wabco Gmbh & Co. Ohg | Noise reduction device for air compressors |
US20040211172A1 (en) * | 2003-04-24 | 2004-10-28 | Chuanfu Wang | Muffler and catalytic converter devices |
CN107514350B (en) * | 2017-08-21 | 2023-04-07 | 珠海格力电器股份有限公司 | Silencer and heat pump system |
-
2019
- 2019-04-29 ES ES19000203T patent/ES2910517T3/en active Active
- 2019-04-29 PT PT190002030T patent/PT3734071T/en unknown
- 2019-04-29 EP EP19000203.0A patent/EP3734071B1/en active Active
-
2022
- 2022-03-24 CY CY20221100237T patent/CY1125565T1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN204783543U (en) * | 2015-07-09 | 2015-11-18 | 重庆美的通用制冷设备有限公司 | A sound proof box and compressor unit spare for compressor |
CN109210757A (en) * | 2018-10-23 | 2019-01-15 | 珠海格力电器股份有限公司 | Soundproof cotton containing multiple layers of sound absorbing materials and compressor |
Also Published As
Publication number | Publication date |
---|---|
EP3734071A1 (en) | 2020-11-04 |
CY1125565T1 (en) | 2024-02-16 |
PT3734071T (en) | 2022-04-04 |
ES2910517T3 (en) | 2022-05-12 |
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