[001] The present subject matter described herein, relates to motor operated household appliances. In particular, the present subject matter describes a household appliance having an air guide to direct the air flow towards hottest region of motor for reducing heat generated during regular operations.
BACKGROUND
[002] Kitchen appliances such as mixer-grinder, blender etc. uses motor for their intended uses. Motor in operating stage produces heat which increase the temperature of the motor. The temperature rise determines the limit to which motor can be loaded. This produced heat must be dissipated to prevent damage to the motor.
[003] Usually, the manufacturers of kitchen appliances provide a fan on the top and bottom of the motors to produce the air flow around the stator and rotor for removing heat generated during regular operation. It has been observed that the region between commutator and rotor known as neck is the hottest region in the motor due to friction.
[004] The fan provided in motor either pushes or pulls the air around rotor and stator. The air flows through rotor and stator to fan without flowing through this neck and commutator region. Currently, there is no provision provided to guide the air in the neck and commutator region of the motor.
[005] The present invention provides an air guide to direct air flow towards the neck and commutator region between the commuter and the rotor. This air flow in neck and commutator region keeps the temperature in operating limit and fix overheating problem in motor.
[006] Indian Patent Application No. 201711035473 dated October 6, 2017 filed by Havells India Limited talks about an air channelization system with visco-elastic material to manage temperature rise in motor of a grinding and mixing

appliance along with noise and vibration reduction. However, the invention is focusing on guiding the air flowing outside the motor.
[007] US patent application US20070133347A1 discloses a kitchen appliance in particular a blender with lighter motor to solve the problem of thermal overload.
[008] US patent application US 3738616 A discloses a motor operated electric appliance having the elements of the motor supported directly on the plastic housing members. Air conduit means formed directly in the plastic housing members directs the motor cooling air into the interior of the housing and across the motor for cooling purposes.
[009] Russian Patent application RU2270511C1 discloses a method for protecting DC motor against commutator flashing over. In this application air is supplied to arcing area under brushes along tangential line to commutator surface in direction opposing commutator rotation.
[0010] US Patent Application US4399378A discloses a filter for a cooling air stream of an electric commutator motor for a household device has a passage into which a cooling air stream flows after passing an electric commutator motor, and a filtering member composed of an electrostatically charged material which coats the passage partially or completely.
[0011] None of the cited documents above disclose an air guide to direct the air flow towards the hottest region of motor operated kitchen appliances. In present subject matter, the air between the rotor and stator (which has more velocity than outside air) is guided towards the neck and commutator region between the commutator and the rotor with the help of air guide.
[0012] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

OBJECTS OF THE DISCLOSURE
[0013] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0014] The principal object of the present invention is to develop an air guide to direct the air between the rotor and stator (which has more velocity than outside air) towards the neck and commutator region, between the commutator and the rotor with the help of air guide.
[0015] Another object of the present invention is to develop an air guide to maintain the temperature of the motor.
[0016] Another object of the present invention is to develop an air guide to stop motor from overheating.
[0017] Yet another object of the present invention is to develop an air guide to provide air flow to the hottest region of the motor to reduce heat.
[0018] Yet another object of the invention is to develop an air guide to provide air flow to the hottest region of the motor to reduce its temperature.
[0019] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.
SUMMARY
[0020] This summary is provided to introduce concepts related to a household appliance having an air guide to direct the air flow towards hottest region of motor for reducing heat generated during regular operations. 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.
[0021] The present disclosure related to a household appliance having one or more air guides positioned right below a space between a rotor and a stator of a

motor. Each of the air guide includes a fixing plate for fixing the air guide on an inner wall of the motor, and further includes an air directing portion extending longitudinally from the fixing plate. In an aspect, the air directing portion is to receive an air flow from a top fan disposed above the motor and to direct the air flow towards neck and a commutator of the household appliance.
[0022] In an aspect, the fixing plate is provided with a hole to accommodate a fixing means for fixing with the air guide on the inner wall.
[0023] In an aspect, the fixing means includes, but not limited to, rivets, screws, and bolts.
[0024] In an aspect, the inner radius of curvature of the air directing portion is between 21 mm to 25 mm.
[0025] In an aspect, the outer radius of curvature of the air directing portion is between 23 mm to 27 mm.
[0026] In an aspect, the length of the air guide is between 25 mm to 35 mm.
[0027] In an aspect, the breadth of the air guide is between 20 mm to 25 mm.
[0028] In an aspect, the width of the air guide is between 2 mm to 5 mm.
[0029] In an aspect, the household appliance can be any appliance used in the house. For instance, the household appliance may include kitchen blender, washing machine, kitchen mixer, juicer mixer, air conditioner, and so forth. Those skilled in the art can appreciate that the present disclosure can be implemented in a number of household appliances which require cooling in the neck and commutator region of an electric motor.
[0030] Thus, the present invention discloses an air guide to direct the fan forced air flow towards neck and commutator region (hottest region in the motor) between commutator and rotor of kitchen appliance motor. The air is forced to flow through neck and commutator region to reduced heat generated during regular operation. By reducing heat, temperature of the motor is kept in limit for

better operation of the appliance. The air guide disclosed did not let overheating occur in motor and save the appliance from possible damage.
[0031] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0033] Fig. 1A illustrates top view of the first embodiment of the proposed air guide;
[0034] Fig. IB illustrates side view of the first embodiment of the proposed air guide;
[0035] Fig. 1C illustrates isometric view of the first embodiment of the proposed air guide;
[0036] Fig. 2 illustrates schematic of air guide assembly in accordance with present invention; and
[0037] Fig. 3 illustrates line diagram of air guide assembly in accordance with present invention.

[0038] Fig. 4 illustrates side view of the second embodiment of the proposed air guide;
[0039] Fig. 5 illustrates side view of the third embodiment of the proposed air guide.
[0040] 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
[0041] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0042] The terms "comprises", "comprising", or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by "comprises... a" does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
[0043] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those

skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0044] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. 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.
[0045] Embodiments described herein relates to a household appliance having one or more air guides positioned right below a space between a rotor and a stator of a motor. Each of the air guide is to receive an air flow from a top fan disposed above the motor and to direct the air flow towards neck and a commutator of the household appliance.
[0046] For instance, referring to Figures 1A, IB, 1C and Figure 3, wherein top, side, isometric view of air guide and air guide assembly is shown respectively, in accordance with an embodiment of the present disclosure. The air guide (100) comprises a fixing plate (101) provided for fixing the air guide (100) on the inner wall (302) of the motor (300). The fixing plate (101) is fixed to the inner wall (302) with the help of fixing means such as rivets, bolt, screw, etc., and a hole (106) is provided on the fixing plate (101) to accommodate the fixing means.

[0047] Further, an air directing portion (103) is extending longitudinally from the fixing plate (101). The air directing portion (103) is used to force air flow coming from the space between the rotor (203) and the stator (204) towards neck (201) and commutator (202) region. The neck (201) and commutator (202) region is the hottest region of the motor and it is of immense importance to keep temperature of this region in limits.
[0048] According to an implementation, inner radius of curvature (104) of the air directing portion (103) is between 21 mm to 25 mm. Outer radius of curvature (105) of the air directing portion (103) is between 23 mm to 27 mm. Length, breadth and width of air guide (100) is between 25 - 35 mm, 20-25 mm and 2-5 mm respectively.
[0049] In an aspect air directing portion (103) can be a convex curved surface or a concave curved surface.
[0050] In another embodiment, instead of a curved portion, the air directing portion (103) may be a straight portion or any other shape can be used.
[0051] In an aspect, the air guide (100) is positioned right below the space between rotor (203) and stator (204).
[0052] In operation, the temperature of the motor (300) rises while operation of the household appliance. To reduce such rise in the temperature of the motor (300), a top fan (205) pushes the air in between a rotor (203) and a stator (204) of the motor (300). The air moves through the space between the rotor (203) and stator (204) towards a bottom fan (206). Using this space, the air guide (100) is positioned right below the space between the rotor (203) and the stator (204) in such a way that the air directing portion (103) extending from the fixing plate (101) guides the air received from the top fan (205) towards the neck (201) and commutator (202) region. This guidance or diversion of the air reduces the heat in the neck (201) and commutator (202) region, which consequently reduces the temperature in that region. Accordingly, the air guide (100) prevents overheating

of the motor (300) and save household appliances from damage and increases their lifespan.
[0053] Thus, the air guide (100) proposed herein increases the cooling efficiency
of the motor (300) as well as the household appliances. With the implementation
5 of air guide (100), it is analyzed that the air flow at the outlet (bottom fan (206) is
increased by 20% and the rise in temperature during operation is decreased by 10%.
[0054] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended
10 claims) are generally intended as “open” terms (e.g., the term “including” should
be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such
15 an intent will be explicitly recited in the claim, and in the absence of such
recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation
20 by the indefinite articles “a” or “an” limits any particular claim containing such
introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds
25 true for the use of definite articles used to introduce claim recitations. In addition,
even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or
30 two or more recitations). Furthermore, in those instances where a convention
10

analogous to “at least one of A, B, and C, etc.” is used, in general such a
construction is intended in the sense one having skill in the art would understand
the convention (e.g., “a system having at least one of A, B, and C” would include
but not be limited to systems that have A alone, B alone, C alone, A and B
5 together, A and C together, B and C together, and/or A, B, and C together, etc.).
In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone,
10 B alone, C alone, A and B together, A and C together, B and C together, and/or A,
B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or
15 both terms. For example, the phrase “A or B” will be understood to include the
possibilities of “A” or “B” or “A and B.”
[0055] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps
20 or components. The present invention contemplates all of these combinations.
Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention may have been described in the context of only one of the illustrated
25 embodiments, such feature may be combined with one or more other features of
other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present invention. The present invention also encompasses intermediate and end products resulting from the
30 practice of the methods herein. The use of “comprising” or “including” also
11

contemplates embodiments that "consist essentially of or "consist of the recited feature.
[0056] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

We claim:

A household appliance comprising:
one or more air guides (100) positioned right below a space between a rotor (203) and a stator (204) of the motor (300), wherein each of the air guide (100) comprises:
a fixing plate (101) for fixing the air guide (100) on an inner
wall (302) of the motor (300), and
an air directing portion (103) extending longitudinally from
the fixing plate (101);
wherein the air directing portion (103) is to receive an air
flow from a top fan (205) disposed above the motor (300) and to
direct the air flow towards neck (201) and a commutator (202) of
the household appliance. The household appliance as claimed in claim 1, wherein the fixing plate (101) is provided with a hole (106) to accommodate a fixing means for fixing with the air guide (100) on the inner wall (302). The fixing means as claimed in claim 2, wherein the fixing means includes rivets, screws, and bolts.
The household appliance as claimed in claim 1, wherein air directing portion (103) includes convex curved surface or concave curved surface or a straight portion.
The household appliance as claimed in claim 1, wherein inner radius of curvature (104) of the air directing portion (103) is between 21 mm to 25 mm.
The household appliance as claimed in claim 1, wherein outer radius of curvature (105) of the air directing portion (103) is between 23 mm to 27 mm.
The household appliance as claimed in claim 1, wherein the length of the air guide (100) is between 25 mm to 35 mm.

The household appliance as claimed in claim 1, wherein the breadth of the air guide (100) is between 20 mm to 25 mm.
The household appliance as claimed in claim 1, wherein the width of the air guide (100) is between 2 mm to 5 mm.