Description:AN ASYMMETRIC TANGENTIAL FLOW EXHAUST DUCT FOR ELECTRICAL DEVICES
TECHNICAL FIELD
The present disclosure relates generally to an exhaust duct and more particularly to an asymmetric tangential flow exhaust duct for electrical devices.

BACKGROUND
Exhaust ducts are primarily used in electrical devices for the purpose of ventilation and heat dissipation. An exhaust duct is a channel or conduit used to remove or redirect air, gases, fumes, or other airborne substances from an enclosed space to the outside environment. It is commonly found in various settings, including residential, commercial, and industrial applications, where ventilation or extraction of air is necessary. In electrical components, exhaust duct is used in mixer grinders, kitchen chimney, induction cook top, centrifugal pump etc.
The existing exhaust ducts used in the electrical devices has symmetrical profile. FIG. 1a illustrates top view of an exhaust duct in accordance with the existing art. As shown in the FIG. 1a, profile of the existing exhaust ducts 100 is symmetrical. The imaginary axis A1 bifurcate the exhaust duct 100 into two identical parts. The exhaust duct 100 comprises a structure with upper base 101a and lower base 101b (shown in figure 1c) with openings in the middle. The outer boundary 101aa, 101ba (shown in figure 1c) of the upper base 101a and lower base 101b, respectively are integrally connected to each other creating a passageway adapted to remove or redirect air, gases, fumes, or other airborne substances from an enclosed space of the electrical device to the outside environment.
The exhaust duct 100 further has an outlet 102 which acts as a termination or redirection point for the air, gases, fumes or other airborne substances coming out from the passageway. The outlet 102 has an upper outlet vane 102a integrally extending from the upper base 101a of the structure. Further, the outlet has a lower outlet vane 102b (shown in figure 1b) integrally extending from the lower base 101b of the structure below the upper outlet vane 102a. The outlet 102 of the exhaust duct 100 is symmetrically divided into a first outlet section 103a and a second outlet section 103b. Accordingly, the exhaust duct 100 has a symmetrical structure as bifurcated by the axis A1.
FIG. 1b illustrates front view of the exhaust duct in accordance with the existing art. The first outlet section 103a and the second outlet section 103b has a wall 104 in between that restrict the flow of air, gases, fumes or other airborne substances coming out from the passageway. This restriction results in improper air circulation which may eventually result in high temperature rise in the electrical device. This rise in temperature may lead to deterioration in the health of the electrical device and malfunction.
FIG. 1c illustrates sectional side view of the exhaust duct 100 in accordance with the existing art. The upper outlet vane 102a diverges away from the central axis A1. In the existing art, the diverging angle of the upper outlet vane 102a is 15o. The lower outlet vane diverges away from the central axis A1. In the existing art, the diverging angle of the lower outlet vane 102b is 25o. Accordingly, the diverging angle maintained by the upper outlet vane 102a and lower outlet vane 102b from the central axis A1 is different.
FIG. 2 illustrates velocity mapping of the existing exhaust duct. The velocity mapping clearly establishes that the flow of air, gases, fumes or other airborne substances at the termination point of the outlets are restricted due to which the air, gases, fumes or other airborne substances are forced to recirculate many times in the passageway. The recirculation of air, gases, fumes or other airborne substances increases the internal temperature of the exhaust duct as well as the electrical device.
The problem of rise in temperature of the electrical components may eventually leads to malfunction of the electrical device. Thus, it is important to maintain the temperature of the electrical devices within permissible limits for proper working of the device. Further, the efficiency of the flow of air, gases, fumes or other airborne substances are to be maintained to stop recirculation in the passageway of the exhaust duct.
Accordingly, there is a need for a exhaust duct which is capable of maintaining temperature of the electrical device within permissible limit by restricting recirculation of the air, gases, fumes or other airborne substances.

SUMMARY
This summary is provided to introduce concepts related to an asymmetrical tangential flow exhaust duct. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
The present subject matter relates to an asymmetric tangential flow exhaust duct for electrical devices. The exhaust duct comprises a structure having an outlet. The structure has an upper base and a lower base with an opening in the upper base and the lower base. Outer boundary of the upper base is integrally connected to the outer boundary of the lower base creating a continuous passageway. The outlet has an upper outlet vane integrally extending from the upper base of the structure and a lower outlet vane integrally extending from the lower base of the structure below the upper outlet vane. The upper outlet vane and the lower outlet vane are integrally connected to each other from the sides creating a first side wall and a second side wall. The structure of the exhaust duct is asymmetrical with the upper base and the lower base of the structure having a first half and an asymmetric second half asymmetric. The outlet has no separating component and air, gases, fumes or other airborne substances in the continuous passageway can terminate form the outlet without any obstructions.
In an aspect, the first side edges of the outlet make a diverting angle with the outer boundaries of the upper base and the lower base.
In an aspect, the continuous passageway is formed between the inner boundaries and the outer boundaries of the upper base and the lower base.
In an aspect, contour of the outer boundaries of the upper base and the lower base includes circular or other similar circular forms.
In an aspect, contour of the inner boundaries of the upper base and the lower base is independent of the contour of the outer boundaries of the upper base and the lower base.
In an aspect, the second side edges of the outlet is in dead level with the outer boundaries of the upper base and lower base.
In an aspect, the mean radius of curvature of the continuous passageway of the second half of the structure is more than the mean radius of curvature of the continuous passageway of the first half of the structure.
In an aspect, the upper outlet vane and the lower outlet vane are diverging from each other.
In an aspect, angle between the upper outlet vane a and the upper base is in the range 17o to 21o.
In an aspect, the angle between the lower outlet vane 304b and the lower base 302 is in the range 20o to 23o.
In an aspect, the index α is in the range of 4 to 15.
In an aspect, the exhaust duct is adapted to fit in an electrical device to terminate or redirect the air, gases, fumes, or other airborne substances.
In an aspect, exhaust duct is adapted to take in air, gases, fumes, or other airborne substances from the openings of the upper base and the lower base, circulate the air, gases, fumes, or other airborne substances in the continuous passageway and remove the air, gases, fumes, or other airborne substances from the electrical device through the outlet.
To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the scope of the present subject matter.
Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF FIGURES
The illustrated embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:
FIG. 1a illustrates top view of an exhaust duct in accordance with the existing art;
FIG. 1b illustrates front view of the exhaust duct in accordance with the existing art;
FIG. 1c illustrates sectional side view of the exhaust duct 100 in accordance with the existing art;
FIG. 2 illustrates velocity mapping of the existing exhaust duct;
FIG. 3 illustrates top view of an exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure:
FIG. 4 illustrates top view of an exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure;
FIG. 5 illustrates front view of the exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure;
FIG. 6 illustrates sectional side view of the exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure;
FIG. 7 illustrates velocity mapping of the asymmetrical tangential flow exhaust duct;
FIG. 8a illustrates asymmetric tangential flow exhaust duct in an exemplary mixer grinder;
FIG. 8b illustrates air flow mapping of asymmetric tangential flow exhaust duct in an exemplary mixer grinder;
FIGs. 9a and 9b illustrates top view and side view of the exemplary induction cook top with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure;
FIG. 10 illustrates front view of an exemplary kitchen chimney with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure; and
FIGs. 11a and 11b illustrate side and top views of an exemplary centrifugal pump with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure.
The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
A few aspects of the present disclosure are explained in detail below with reference to the various figures. Example implementations are described to illustrate the disclosed subject matter, not to limit its scope, which is defined by the claims. Those of ordinary skill in the art will recognize a number of equivalent variations of the various features provided in the description that follows.
Definitions
In the disclosure hereinafter, one or more terms are used to describe various aspects of the present disclosure. For a better understanding of the present disclosure, a few definitions are provided herein for better understating of the present disclosure.
“Electrical Devices” may be defined, in the context of the invention, as the devices usually deployed in household where there is need to remove or redirect air, gases, fumes, or other airborne substances.
“Passageway” may be defined, in the context of the invention, as pathway that allows flow of the air, gases, fumes, or other airborne substances. The passageway formed in the proposed asymmetric tangential flow exhaust duct is a continuous passageway that maintains a flow of the air, gases, fumes, or other airborne substances without much obstructions.
“Other Similar Circular Forms” is defined, in the context of the invention, shapes or configurations that share similarities with a circle but may not be perfect circles themselves. It implies that the contours or boundaries under consideration have a circular nature or exhibit characteristics akin to circles.

EXEMPLARY IMPLEMENTATIONS
While the present disclosure may be embodied in various forms, there are shown in the drawings, and will hereinafter be described, some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. Not all of the depicted components described in this disclosure may be required, however, and some implementations may include additional, different, or fewer components from those expressly described in this disclosure. Variations in the arrangement and type of the components may be made without departing from the scope of the claims as set forth herein.
The current exhaust ducts utilized in electrical devices are insufficient in effectively preventing temperature elevation within the devices. One of the primary issues lies in the inadequate design of these exhaust ducts, as they fail to adequately remove or redirect air, gases, fumes, or other airborne substances from an enclosed space to the external environment. The existing exhaust ducts are not able to maintain efficient air flow. The air flow may be impeded leading to reduced ventilation and inadequate removal of heat.
In order to prevent temperature elevation within the electrical device, it is necessary to improve the design of the existing exhaust duct. The elevation in the temperature of the electrical device may lead to malfunctions.
To solve the problems, a tangential flow exhaust duct is required with improved design.
In order to achieve this goal of preventing temperature elevation in the electrical device, an asymmetric tangential flow exhaust duct may be utilized. The asymmetric tangential flow exhaust duct is described in more detail below.
FIG. 3 illustrates top view of an exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure. The asymmetric tangential flow exhaust duct 300 comprises a structure having an upper base 301 and a lower base 302 (shown in Figure 4). The upper base 301 and the lower base 302 has opening 303. The opening 303 creates an inner boundary 301b apart from an already existing outer boundary 301a on the upper base 301. Similarly, the lower base 302 has an inner boundary 302b and an outer boundary 302a. Contour of the opening 303 is contour of the inner boundaries 301b, 302b of the upper base 301 and the lower base 302, respectively. To maintain continuity of flow, contour of the outer boundaries 301a, 302a of the upper base 301 and the lower base 301, respectively, includes circular or other similar circular forms. Contour of the inner boundaries 301b, 302b of the upper base 301 and the lower base 302, respectively, is independent of the contour of the outer boundaries 301a, 302a of the upper base 301 and the lower base 302. It means that the contour of the outer boundaries 301a, 302a and the inner boundaries 301b, 302b could be similar or different. These outer boundaries 301a, 302a are integrally interconnected, ensuring a continuous connection between the upper base 301 and lower base 302. Meanwhile, the inner boundaries 301b, 302b of the upper base 301 and lower base 302 are maintained at a consistent distance from each other. The configuration of this profile establishes a continuous passageway between the inner boundaries 301b, 302b and outer boundaries 301a, 302a of both the upper base 301 and the lower base 302. This continuous passageway is specifically designed to facilitate the circulation of air, gases, fumes, or other airborne substances.
To enable the air circulating within the continuous passageway to exit the exhaust duct 300, an outlet 304 is incorporated within the space between the upper base 301 and the lower base 302. This outlet 304 serves as a means for the air, gases, fumes, or other airborne substances to exit the exhaust duct 300 effectively. The ergonomics of the outlet 304 is designed to create an efficient airflow in the continuous passageway with less recirculation. This efficient airflow is accomplished by ensuring that the flow of air, gases, fumes, or other airborne substances is not restricted or impeded in the outlet 304 of the exhaust duct 300.
The outlet 304 has an upper outlet vane 304a that integrally extends from the upper base 301 of the structure. Further, the outlet 304 has a lower outlet vane 304b (shown in Figure 5) integrally extending from the lower base 302 of the structure. The lower outlet vane 304b is exactly below the upper outlet vane 304a.
First side edge 305 of the outlet 304 makes a diverting angle with the outer edge 301a, 302a of the upper base 301 and the lower base 302. Similarly, second side edge 306 of the outlet 304 is in dead level with the outer edges 301a, 302a of the upper base 301 and the lower base 302. This configuration of the first side edge 305 and the second side edge 306 reduces the flow blockage and restriction to the outlet side which in turn reduce the turbulence induced noise. The first side edge 305 of the upper base 301 and the lower base 302 are integrally connected to each other forming a first side wall (discussed in Figure 5). Similarly, the second side edge 306 of the upper base 301 and the lower base 302 are integrally connected to each other forming a second side wall (discussed in Figure 5).
FIG. 4 illustrates top view of an exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure. In the illustrated FIG. 4, an imaginary axis A2 is shown dividing the exhaust duct 300 in a first half 300a and a second half 300b. As can be seen in the illustration, the exhaust duct 300 is of asymmetric profile. The asymmetric profile of the exhaust duct 300 is a direct result of the openings 303 present in both the upper base 301 and the lower base 302. The openings 303 are provided on the upper base 301 and the lower base 302 in a way that the openings 303 are near to outer boundaries 301a, 302a in the first half 300a and farther to outer boundaries 301a, 302a in the second half 300b. Accordingly, the mean radius of curvature RB of the continuous passageway of the second half 300b of the exhaust duct 300 is more than the mean radius of curvature RA of the passageway of the first half 300a of the exhaust duct 300.
This asymmetrical nature of the exhaust duct 300 makes the continuous passageway in the first half 300a narrower than the passageway in the second half 300b. In other words, width W2 of the passageway in the second half 300b is more than width W1 of the passageway in the first half 300a. Thus, the cross-sectional area of the continuous passageway in second half 300b is more than the cross-sectional area of the continuous passageway in the first half 300a. Thus, in accordance with principal of continuity, the air in the first half 300a of the continuous passageway has higher velocity than the air in the second half 300b of the continuous passageway.
The first side edge of the outlet makes an angle Ѳ1 with the center and the second side edge of the outlet makes an angle Ѳ2 with the center. The initial radius of curvature of the first half is R1 and the final radius of curvature of the second half is R2.
Incremental Radius (i) = R2-R1
Index = 𝛼
x = (R1+ i*tα)*cos(θ1+(t*(θ2 - θ1))
y = (R1+ i*t α )*sin(θ1+t*(θ2 - θ1))
In an aspect, the first side edge angle Ѳ1 of the outlet is in the range of 30o to 55o. The second side edge angle Ѳ2 of the outlet is in the range of 300o to 330o. Index is a mathematical factor that governs the geometry of the spiral. The index exclusively influences the shape of the spiral and falls within the range of 4 ≤ α ≤ 15.
FIG. 5 illustrates front view of the exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure. In the illustrated FIG. 5, an imaginary axis A3 is shown dividing the exhaust duct 300 in a first half 300a and a second half 300b. From the front view, it is evident that the first side wall 501 of the duct 300 is at an angle with the imaginary axis A3. Contrary to this, from the front view, it is evident that the second side wall 502 of the duct 300 is parallel to the imaginary axis A3.
The outlet 304 of the exhaust duct 300 has no separating component in between the first side wall 501 and the second side wall 502. It is because of no separating component, the passageway formed between the inner boundaries 301b, 302b and outer boundaries 301a, 302a of the upper base 301 and the lower base 302 is continuous passageway. Thus, the air, gases, fumes, or other airborne substances can exit from the outlet 304 without any obstruction. As the outlet 304 let the air, gases, fumes, or other airborne substances exit without obstructions, there will be less recirculation in the continuous passageway. This result in less elevation of the temperature inside the electrical device, hence, preventing malfunction.
Now turning the attention to FIG. 6 which illustrates sectional side view of the exemplary asymmetric tangential flow exhaust duct that can be utilized to implement one or more exemplary embodiments of the present disclosure. The upper outlet vane 304a and the lower outlet vane 304b is angularly tilted. In an aspect, the upper outlet vane 304a makes a diverging angle with the upper base 301. The angle is in the range of 17o to 21o. In an aspect, the lower outlet vane 304b makes a diverging angle with the lower base 302 of the exhaust duct 300. The angle is in the range of 20o to 23o. In an aspect, the inner boundary 301b of the upper base 301 is angularly tilted upwards. In the preferred embodiment, the inner boundary is perpendicularly tilted upwards.
FIG. 7 illustrates velocity mapping of the asymmetrical tangential flow exhaust duct. The velocity mapping clearly establishes that the flow of air, gases, fumes or other airborne substances at the termination/ redirection point of the outlet 304 are not restricted due to which the air, gases, fumes or other airborne substances can efficiently leave the electrical device and recirculation of the air, gases, fumes and other airborne substances is to a minimum. The efficient termination of air, fumes, gases or other airborne substance from the outlet 304 is clearly understood from the velocity mapping.
WORKING OF THE SUBJECT MATTER
FIG. 8a illustrates asymmetric tangential flow exhaust duct in an exemplary mixer grinder. The asymmetric tangential flow exhaust duct 300 is deployed in a mixer grinder 800 to redirect the hot air generated by the motor assembly towards the outlet 304. The opening 303 in the lower base 302 act as an air inlet and the air circulate in the continuous passageway and exit through the outlet 304. The improved design of the asymmetric tangential exhaust duct 300 ensures efficient extraction of hot air from the interior of the mixer grinder 800.
FIG. 8b illustrates air flow mapping of asymmetric tangential flow exhaust duct in an exemplary mixer grinder. It is clearly visible from the velocity mapping that the velocity of air inside the continuous passageway is very high. Further, the velocity of air coming out of the duct is also high. This indicates that the recirculation of air inside the continuous passageway is to a minimum and the hot air is efficiently removed from the interior of the mixer grinder. The efficient removal of hot air without recirculation inside the continuous passageway eventually results in better temperature reduction inside the mixer grinder.
Table 1 below shows CAE analysis of the asymmetric tangential flow exhaust duct deployed in a mixer grinder.

CAE Flow analysis Motor Vent outlet
Sample RPM Velocity (m/sec) Mass Flow Rate (kg/sec.) Heat Loss (J/sec) Pressure Drop (Pa)
(Analytical)
Conventional Design 20000 7.8 0.013 366.5 -58.61
Proposed Design 20000 12.45 0.021 401 -91.73
The proposed asymmetric tangential flow exhaust duct shows a 61% better performance in terms of outlet flow rate through the outlet.
Table 2 below shows physical validation of RPT of the proposed asymmetric tangential flow exhaust duct deployed in mixer grinder.
Sample Rated voltage Load (Watt) R1 (Ω) R2 (Ω) T1 (Deg.) T2 (Deg.) Temp. rise (Deg.) Remarks
Proposed Design 207 500W 8.71 11.2 34.4 34.6 73.96 Stator
7.75 9.64 34.4 34.6 65.38 Armature

Conventional Design 207 500W 9.32 13.4 30.4 30.8 111.41 Stator
7.64 10.48 30.4 30.8 98.07 Armature
The proposed asymmetric tangential flow exhaust duct shows a 33% temperature reduction as compared to the existing ducts.
FIG. 9a and 9b illustrates top view and side view of the exemplary induction cook top with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure. The implementation of an asymmetric tangential flow exhaust duct in an induction cooktop 900 enables efficient extraction of hot air from its interior. The opening 303 in the lower base 302 act as an air inlet and the air circulate in the continuous passageway and exit through the outlet 304. The improved design of the asymmetric tangential exhaust duct 300 ensures that interior temperature of the induction cook top does not exceed permissible limit.
FIG. 10 illustrates front view of an exemplary kitchen chimney with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure. The implementation of an asymmetric tangential flow exhaust duct 300 in a kitchen chimney 1000 enables efficient extraction of hot air, gases, fumes or other airborne substances from its interior. Again, the opening 303 in the lower base 302 act as an air inlet and the air, gases, fumes or other airborne substances circulate in the continuous passageway and exit through the outlet 304. The improved design of the asymmetric tangential exhaust duct 300 ensures efficient redirection of the air, gases, fumes or other airborne substances from one direction to other.
FIGs. 11a and 11b illustrate side and top views of an exemplary centrifugal pump with asymmetric tangential flow exhaust duct in accordance with one of the exemplary embodiments of the present disclosure. The centrifugal pump 1100 mainly comprises fan component 1101 and asymmetrical tangential flow exhaust duct 300. The fan component 1101 is responsible for moving air or gases. It operates on the same principles as a centrifugal pump but is designed to handle gases rather than liquids. The fan component 1101 consists of an impeller or rotor that draws in air or gases through the opening 303 in the lower base 302 and then accelerates and discharges them outward at higher velocities, creating airflow.
ADVANTAGES
The asymmetric tangential flow exhaust duct is capable of maintaining temperature of the electrical device by restricting recirculation of the air, gases, fumes or other airborne substances into the duct again. The asymmetric tangential flow exhaust duct can also be use to redirect air, gases, fumes or other airborne substances from one direction to other. Furthermore, an asymmetric tangential flow exhaust duct can be employed in various electrical devices to divert or redirect hot air emanating from components like motors, fans, etc., towards a heat sink. By adjusting the dimensions of the exhaust duct while maintaining its design, it can be customized for use in different electrical devices.
The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims. , Claims:We Claim:
An asymmetric tangential flow exhaust duct 300 for electrical devices, the exhaust duct 300 comprises:
a structure having an upper base 301 and a lower base 302 with an opening 303 of the upper base 301 and the lower base 302, wherein outer boundary 301a of the upper base 301 is integrally connected to outer boundary 302a of the lower base 302 creating a continuous passageway; and
an outlet 304 having an upper outlet vane 304a integrally extending from the upper base 301 of the structure and a lower outlet vane 304b integrally extending from the lower base 302 of the structure below the upper outlet vane 304a, wherein the upper outlet vane 304a and the lower outlet vane 304b is integrally connected to each other from the sides creating a first side wall 501 and the second side wall 502;
characterized in that
the structure of the exhaust duct 300 is asymmetrical with the upper base 301 and lower base 302 of the structure having a first half 300a, and a second half 300b asymmetric to the first half 300a; and
the outlet 304 has no separating component and air, gases, fumes, or other airborne substances in the continuous passageway can terminate from the outlet 304 without any obstruction.
The exhaust duct 300 as claimed in claim 1, wherein the first side edges 305 of the outlet 304 makes a diverting angle with the outer boundaries 301a of the upper base 301 and the lower base 302.
The exhaust duct 300 as claimed in claim 1, wherein the continuous passageway is formed between the inner boundaries 301b, 302b and the outer boundaries 301a, 302a of the upper base 301 and the lower base 302.
The exhaust duct 300 as claimed in claim 1, wherein contour of the outer boundaries 301a, 302a of the upper base 301 and the lower base 301 includes circular or other similar circular forms.
The exhaust duct 300 as claimed in claim 1, wherein contour of the inner boundaries 301b, 302b of the upper base 301 and the lower base 302 is independent of the contour of the outer boundaries 301a, 302a of the upper base 301 and the lower base 302.
The exhaust duct 300 as claimed in claim 1, wherein the second side edges 306 of the outlet 304 is in dead level with the outer boundaries 301a of the upper base 301 and lower base 302.
The exhaust duct 300 as claimed in claim 1, wherein the mean radius of curvature R2 of the continuous passageway of the second half 300b of the structure is more than the mean radius of curvature R2 of the continuous passageway of the first half 300a of the structure.
The exhaust duct 300 as claimed in claim 1, wherein the upper outlet vane 304a and the lower outlet vane 304b are diverging from each other.
The exhaust duct 300 as claimed in claim 1, wherein angle between the upper outlet vane 304a and the upper base 301 is in the range 17o to 21o.
The exhaust duct 300 as claimed in claim 1, wherein the angle between the lower outlet vane 304b and the lower base 302 is in the range 20o to 23o.
The exhaust duct 300 as claimed in claim 1, wherein the index α is in the range of 4 to 15.
The exhaust duct 300 as claimed in claim 1, wherein the exhaust duct 300 is adapted to fit in an electrical device to terminate or redirect the air, gases, fumes, or other airborne substances.
The exhaust duct 300 as claimed in claim 1, wherein exhaust duct 300 is adapted to take in air, gases, fumes, or other airborne substances from the openings 303 of the upper base 301 and the lower base 302, circulate the air, gases, fumes, or other airborne substances in the continuous passageway and remove the air, gases, fumes, or other airborne substances from the electrical device through the outlet 304.