FORM 2
THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13)
1. Title of the invention: DEVICE FOR SUPPRESSING NOISE FROM A MACHINE
2. Applicant(s)
NAME NATIONALITY ADDRESS
CEAT LIMITED Indian RPG HOUSE, 463, Dr. Annie Besant Road, Worli, Mumbai, Maharashtra 400030, India
3. Preamble to the description
COMPLETE SPECIFICATION
The following specification particularly describes the invention and the manner in which it
is to be performed.

FIELD OF INVENTION
[0001] The present subject matter relates, in general, to suppressing
noise from a machine, and particularly, to a device for suppressing noise generated by air exhausted from a machine.
BACKGROUND
[0002] In general, machines that are being used in various industrial
settings operate by releasing high-pressure air. The release of high-pressure air can generate a considerable amount of sound. For example, some air compressor systems may discharge a high-pressure gas in the atmosphere thereby generating a considerable amount of sound. Another example may be heat pump systems in which exhaust gas that is released into the atmosphere may generate large amount of sound.
BRIEF DESCRIPTION OF FIGURES
[0003] The detailed description is provided with reference to the
accompanying figures, wherein:
[0004] FIG. 1 illustrates a schematic of a device for suppressing
noise from a machine, according to an example;
[0005] FIG. 2 illustrates a top view of a device for suppressing noise
from a machine, according to the example; and
[0006] FIG. 3 illustrates a schematic of an outlet of a device for
suppressing noise from a machine, according to an example.
DETAILED DESCRIPTION
[0007] In general, machines that may operate by releasing high-
pressure air (such as heat pump engines) may generate a considerable

amount of undesirable sound (hereinafter referred to as noise). The level of noise produced can be measured in decibels (dB) that quantifies the intensity of sound. In many cases, the noise levels can reach up to 117dB or more, which is considered unsafe for human ears. Prolonged exposure to such high levels of noise can lead to hearing damage or hearing loss and may also create an uncomfortable and stressful work environment.
[0008] One common method of mitigating this noise is through the
use of sound silencing devices, for example, silencers or mufflers. These devices may be coupled with machine(s) that may produce high-pressure air into the atmosphere.
[0009] Typically, sound silencing devices may be designed with a
variety of shapes and sizes and can be made from different materials such as metal or plastic. The design and material of these sound silencing devices can greatly influence its effectiveness in reducing noise levels. The coupling of these devices with the machines often involves connecting them to the exhaust of the machine through hose pipes or similar conduits.
[0010] However, the use of existing sound silencing devices may
suffer from various problems. For example, achieving a substantial reduction in noise levels with the existing sound silencing devices is challenging. Another example is to provide economically viable sound silencing devices. In some cases, complex design or presence of additional layers with different material in the silencing device may lead to an increase in the cost of manufacturing such devices. Therefore, there is a continuous effort in the field to improve the design and functionality of sound silencing devices to effectively reduce noise levels while also keeping the manufacturing of such devices economically viable.
[0011] The present subject matter relates to a device for suppressing
noise generated by air exhausted from a machine that may be used in manufacturing industries such as tyre manufacturing industry. In an example, the machine may be an air compressing system that takes air from

its surroundings and discharges the air at a higher pressure. In another example, the machine may be a machine belonging to industrial settings where machines operate by releasing high-pressure air, such as in the automotive industry, woodworking industry, agricultural industry. The noise produced by these machines may reach levels as high as 117dB, which may lead to hearing damage or permanent hearing loss. The noise may also create an uncomfortable and stressful work environment.
[0012] The device disclosed hereinafter is designed to receive high-
pressure air released by the machine in a tube to transport the high-pressure air away from the machine. The tube may contain further tubes within it such that the high-pressure air gets expanded while transporting within the tubes, thus facilitating release of air at a lower pressure into the atmosphere. This process results in a substantial reduction in noise generation.
[0013] In an example, the device includes a first cylindrical tube
having a first diameter and is to receive the exhaust of air (high pressure air) from the machine via at least one first inlet. In an example, the at least one first inlet is connected to the machine through hope pipes. A second cylindrical tube having a second diameter smaller than the first diameter is disposed inside the first cylinder. The second cylindrical tube is to receive air from the first cylindrical tube via a second inlet. While entering the first cylindrical tube, the air has a first pressure. The pressure of the air then changes from the first pressure to a second pressure. The air enters the second cylindrical tube with the second pressure. The second pressure is lesser than first pressure. A third cylindrical tube having a third diameter smaller than the second diameter is disposed within the second cylindrical tube. The third cylindrical tube is to receive the air from the second cylindrical tube via a third inlet and is to release the air into the atmosphere via an outlet. The pressure of the air then changes from the second pressure to a third pressure which is smaller than the second pressure. The outlet is

disposed at the third cylindrical tube at a distance from the third inlet. The air that exhausts out the outlet has a fourth pressure which is lesser in magnitude than the third pressure. Due to the pressure of the air continuously reducing while moving through the device, i.e., from the first cylindrical tube to the third cylindrical tube and escaping through the outlet to the atmosphere, the noise level of the exhaust air reduces from a first noise level to a noise level that is safe for human ears. Such a reduction is possible because the air pressure is directly proportional to the noise generated by the air and the device ensures the pressure reduction of the air within the cylindrical tubes of the device and thus the reduction of the noise being generated.
[0014] Accordingly, the present subject matter facilitates reducing the
noise of the machine when the machine is coupled to the device of the present subject matter. Particularly, the device of the present subject matter facilitates reduction of the noise generated by air exhausted from the machine to a safe level. The safe level is a norm set as per the industry standard. The present subject matter provides a cost-effective device with a simple design for suppressing noise from a machine, i.e., within the same size configuration, the desired noise suppression is achieved.
[0015] As used hereinafter, the terms “comprises,” “comprising,”
“includes,” “including,” “has,” “having” and any other variation thereof, are intended to cover a non-exclusive inclusion.
[0016] The advantages of the present subject matter would be
described in greater detail in conjunction with FIGS. 1-3 in the following description. The manner in which the head wearable device is implemented and used shall be explained in detail with respect to FIGS. 1-3.
[0017] It should be noted that the description merely illustrates the
principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject

matter and are included within its scope. Furthermore, all examples recited herein are intended only to aid the reader in understanding the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects and implementations of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[0018] FIG. 1 shows a schematic of a device 100 for suppressing
noise generated by air exhausted from a machine (not shown) that releases high-pressure air in the atmosphere, in accordance with an implementation of the present subject matter. The device 100 is coupled to the machine. The high-pressure air released from the machine generates noise. In an example, the machine may be an air compressing system. In an example, any machine that generates high-pressure air that in turn generates noise may be connected to the device 100. In an example, the noise generated by the machine may have a noise level which is not safe for human ears. In an example, the noise may be of 117 Decibels (dB) which is considered as not safe for human ears. In an example, the device 100 may couple to the machine by hose pipes. In an example, other means may be used to couple the device 100 to the machine The device 100 may include a first cylindrical tube 102, a second cylindrical tube 104, and a third cylindrical tube 106, and an outlet 108. A cylindrical tube is a hollow tube that can provide passage to a fluid. The first cylindrical tube 102, a second cylindrical tube 104, and a third cylindrical tube 106 provide a transportation pathway to the high-pressure air before releasing into the atmosphere. The first cylindrical tube 102 has a first diameter D1 and a first length L1, and comprises at least one first inlet 110, a first top portion 111 and a first base portion 112. In an example, the first diameter D1 is of 6 inches. In another example, the first diameter D1 may be in a range of 6 inches to 18 inches. In an example, the first length L1 may be of 600 mm. The at least one first inlet 110 is coupled (connected) to the machine to receive the air at a first pressure (high-pressure). In an example, the first top portion 111 may include an opening

through which the third cylindrical tube 106 extends outside from the first cylindrical tube 102 to the atmosphere.
[0019] The second cylindrical tube 104 may be disposed inside the
first cylindrical tube 102. The second cylindrical tube 104 has a second diameter D2 and a second length L2 and comprises a second inlet 114 and a second base portion 116. The second cylindrical tube 104 receives the air from the first cylindrical tube 102 at a second pressure via the second inlet 114. The second diameter D2 is less than the first diameter D1. In an example, the second diameter D2 is of 4 inches. In another example, the second diameter D2 may be in a range of 4 inches to 12 inches. In an example, the second length L2 may be of 400 mm. In an example, the second length L2 is smaller than the first length L1 at least by a difference in a range of 100 mm to 200 mm. The second pressure is lower than first pressure. The air from the machine travels a path, i.e., the first cylindrical tube 102 and then enters into the second cylindrical tube 104, as a result energy dissipation takes place and pressure of the air reduces. The noise level corresponding to the second pressure may be about 95dB. In an example, the first diameter D1 and the second diameter D2 are related to each other such that the ratio D1 with respect to D2 is in a range of 1.5:1 to 2:1. In an example, the second cylindrical tube 104 is disposed inside first cylindrical tube 102 by using a first support (not shown), such as, a square rib, formed between the first cylindrical tube 102 and the second cylindrical tube 104. In an example, the square rib has a size of 8mm. In an example, any mechanical support may be used to dispose the second cylindrical tube 104 inside first cylindrical tube 102. The first support may provide a spatial separation between the second base portion 116 of the second cylindrical tube 104 and the first base portion 112 of the first cylindrical tube 102. In an example, the spatial separation between the second base portion 116 and the first base portion 112 is in a range of 50 mm to 100 mm. In an example, any range of the spatial separation between the second base portion 116

and the first base portion 112 is possible. The spatial separation is to provide maximum possible circulation of the air inside the first cylindrical tube 102.
[0020] The third cylindrical tube 106 may be disposed inside the
second cylindrical tube 104. The third cylindrical tube 106 has a third diameter D3 and a third length L3 and may comprise a third inlet 118. The third cylindrical tube 106 receives the air from the second cylindrical tube 104 at a third pressure via the third inlet 118. The third diameter D3 is less than the second diameter D2. In an example, the third diameter D3 is of 2 inches. In another example, the third diameter D3 may be in a range of 2 inches to 6 inches. In an example, the third length L3 may be of 700 mm. In an example, the third length L3 is greater than the first length L1 at least by 200 mm to 400 mm. In an example, the third cylindrical tube 106 is disposed inside second cylindrical tube 104 by using a second support (not shown), similar to that used for the second cylindrical tube 104, such as, a square rib, formed between the second cylindrical tube 104 and the third cylindrical tube 106. In an example, the square rib may have a size of 8mm. In an example, a portion of outer peripheral region of the third cylindrical tube 106 may be welded at the opening of the first top portion 111 of the first cylindrical tube 102. In an example, a spatial separation may be provided between the third inlet 118 and the second base portion 116 of the second cylindrical tube 104. In an example, the spatial separation between the third inlet 118 and the second base portion 116 is in a range of 50 mm to 100 mm. In an example, any range of the spatial separation between the third inlet 118 and the second base portion 116 is possible. The spatial separation is to provide maximum possible circulation of the air inside the second cylindrical tube 104. In an example, a portion of the third length L3 may extend outside of the first top portion 111 of the first cylindrical tube 102. In an example, the length of the portion of the third length L3 extending outside of the first top portion 111 is half of the third length L3. The third pressure is lower than the second pressure. The air traveling from the second cylindrical tube 104 may dissipate energy and as a result the

pressure of the air is further reduced. The noise level corresponding to the second pressure may be about 90dB. In an example, the second diameter D2 and the third diameter D3 are related to each other such that ratio of the D2 with respect to the D3 is in a range of 2:1 to 2.5:1.
[0021] The outlet 108 of the device 100 is disposed at the third
cylindrical tube 106 at a distance from the third inlet 118. The outlet 108 is to output the air into the atmosphere at a fourth pressure. The fourth pressure is lower than the third pressure. In an example, the noise level corresponding to the fourth pressure may be about 74.6dB. Therefore, the magnitude of the fourth pressure corresponds to a suppressed noise level which is not harmful to the human ears. In an example, the outlet 108 may include a plurality of holes through which the air escapes the atmosphere from the third cylindrical tube 106. In an example, the second cylindrical tube 104 is deposited (or positioned) inside the first cylindrical tube 102 in a vertical orientation. In another example, the third cylindrical tube 106 is deposited (or positioned) inside the second cylindrical tube 104 in a vertical orientation. In an example, the device 100 may include noise detectors (not shown in figures) to sense the pressure at the at least one first inlets 110, at the second inlet 114, and the third inlet 118.
[0022] In an example, the first cylindrical tube 102, the second
cylindrical tube 104, and the third cylindrical tube 106 may be connected to the machine such that the machine operations, for example, maintenance and cleaning operations may take place easily. In an example, the first cylindrical tube 102, the second cylindrical tube 104, and the third cylindrical tube 106 may be easily replaced with tubes of different diameters to adjust the noise reduction level of the device 100.
[0023] In an example, the first cylindrical tube 102, the second
cylindrical tube 104, and the third cylindrical tube 106 may be made of a same material such as mild steel (MS). The use of mild steel provides the device 100 strength and durability to withstand the high-pressure air from

the machines. Furthermore, mild steel is known for its excellent machinability and weldability, which can facilitate the manufacturing and installation process of the device 100. In another example, the first cylindrical tube 102, the second cylindrical tube 104, and the third cylindrical tube 106 may be made of different materials.
[0024] This design of the device 100 allows the high-pressure air to
be received by the first cylindrical tube 102, the second cylindrical tube 104, and the third cylindrical tube 106. The air while passing through the first cylindrical tube 102, the second cylindrical tube 104, and the third cylindrical tube 106 are expanded, thereby facilitating the release of air at a lower pressure into the atmosphere. This process of capturing and expanding the high-pressure air within the device 100 allows for a stepwise reduction in the pressure and noise level of the air exhausting from the machine.
[0025] The use of hose pipes to connect the cylindrical tubes and the
exhaust of the machine provides a flexible and efficient means of directing the high-pressure air into the device 100. The hose pipes can be easily installed and removed, allowing for easy maintenance and cleaning of the device.
[0026] FIG. 2 shows a schematic top view of a device 200 for
suppressing noise from a machine, in accordance with an implementation of the present subject matter. The device 200 is the same as the device 100. The device 200 is connected to a machine such as a valve module. The device may comprise a first cylindrical tube 202, a second cylindrical tube 204, and a third cylindrical tube 206. The top view of the device 200 represent three concentric circles having radius first radius R1, second radius R2, and third radius R3 respectively. The first radius R1 corresponds to the first cylindrical tube 202, the second radius R2 corresponds to the second cylindrical tube 204, and the third radius R3 corresponds to the third cylindrical tube 206. In an example, the first radius R1 may be in a range of 3 inches to 9 inches. The second radius R2 may be in a range of 2 inches

to 6 inches. The third radius R3 may be in a range of 1 inch to 3 inches. In an example, the ratio of the first radius R1 with respect to the second radius R2 may be in a range of 1.5:1 to 2:1. In an example, the ratio of the second radius R2 with respect to the third radius R3 may be in a range of 2:1 to 2.5:1.
[0027] FIG. 3 shows a schematic top view of an outlet 300 of a device
for suppressing noise generated by air exhausted from a machine, in accordance with an implementation of the present subject matter. The outlet 300 is the same as the outlet 108 of the device 100. The outlet 300 is disposed on a third cylindrical tube (same as the third cylindrical tube 106). From the outlet 300, air escapes out to the atmosphere. The outlet 300 comprises a plurality of holes 310 to enable escape of the air from the inlet of the third cylindrical tube. In another example, the outlet 300 may include a single hole for enabling the escape of the air into the atmosphere. The air escaping out the outlet 300 has a low pressure in comparison to the pressure of the air received by the device from the machine. The noise level corresponding to the air that is released from the outlet 300 is not harmful to human ears.
[0028] Although examples for the present disclosure have been
described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features or methods described. Rather, the specific features and methods are disclosed and explained as examples of the present disclosure.

I/We Claim-
1. A device (100, 200) for suppressing noise generated by air exhausted
from a machine, the device (100, 200) comprising:
a first cylindrical tube (102, 202) having a first diameter (D1) and at least one first inlet (110) connectable to the machine to receive the air at a first pressure;
a second cylindrical tube (104, 204) disposed inside the first cylindrical tube (102, 202), wherein the second cylindrical tube (104, 204) comprises a second diameter (D2) less than the first diameter (D1) and a second inlet (114) distal to the at least one first inlet (110) to receive the air at a second pressure, wherein the second pressure is less than the first pressure, wherein ratio of the first diameter (D1) with respect to the second diameter (D2) is in a range of 1.5:1 to 2:1;
a third cylindrical tube (106, 206) disposed inside the second cylindrical tube (104, 204), wherein the third cylindrical tube (106, 206) comprises a third diameter (D3) less than the second diameter (D2), a third inlet (118) distal to the second inlet (114) to receive the air at a third pressure, wherein the third pressure is less than the second pressure, wherein ratio of the second diameter (D2) with respect to the third diameter (D3) is in a range of 2:1 to 2.5:1; and
an outlet (108, 300) disposed at the third cylindrical tube (106, 206) and distal from the third inlet (118), wherein the outlet (108, 300) is to output the air with a suppressed noise at a fourth pressure less than the third pressure.
2. The device (100, 200) as claimed in claim 1, wherein:
the first cylindrical tube (102, 202) has a first length (L1); and
the second cylindrical tube (104, 204) has a second length (L2), wherein the second length (L2) is smaller than the first length (L1) at least by a difference of in a range of 100 mm to 200 mm.

3. The device (100, 200) as claimed in claim 2, wherein the third cylindrical
tube (106, 206) has a third length (L3), a portion of the third length (L3) being
extending outside of the first cylindrical tube (102, 202); and
the third length (L3) is greater than the first length (L1) at least by a difference in a range of 200 mm to 400 mm.
4. The device (100, 200) as claimed in claim 3, wherein a portion of the third
length (L3) extending outside of the first cylindrical tube (102, 202) is half of
the third length (L3).
5. The device (100, 200) as claimed in claim 1 or claim 2, wherein the
second cylindrical tube (104, 204) is positioned in a vertical orientation
inside the first cylindrical tube (102, 202), and wherein the third cylindrical
tube (106, 206) is positioned in a vertical orientation inside the second
cylindrical tube (104, 204).
6. The device (100, 200) as claimed in one of claims 1 to 5, wherein the first cylindrical tube (102, 202), the second cylindrical tube (104, 204), and the third cylindrical tube (106, 206) are made of same material.
7. The device (100, 200) as claimed in one of claims 1 to 5, wherein the first cylindrical tube (102, 202), the second cylindrical tube (104, 204), and the third cylindrical tube (106, 206) are made of different materials.
8. The device (100, 200) as claimed in claim 1, wherein the first diameter (D1) is 6 inches, the second diameter (D2) is 4 inches, and the third diameter (D3) is 2 inches.
9. The device (100, 200) as claimed in claim 1, wherein:
the first diameter (D1) is in a range of 6 inches to 18 inches;
the second diameter (D2) is in a range of 4 inches to 12 inches; and
the third diameter (D3) is in a range of 2 inches to 6 inches.

10. The device (100, 200) as claimed in one of claims 1 to 7, wherein the first cylindrical tube (102, 202) comprises a first base portion (112) and the second cylindrical tube (104, 204) has a second base portion (116), wherein the first base portion (112) and the second base portion (116) are spatially separated.
11. The device (100, 200) as claimed in claim 10, wherein the third inlet (118) is spatially separated from the second base portion (116).