[0001] The present disclosure relates to a motor cooling assembly. More particularly, the present disclosure relates to a compact cooling assembly with simple design which can effectively extract out the heat from the housing, generated due to motor assembly.

BACKGROUND OF INVENTION
[0002] Nowadays, a blender and/or a mixer are very commonly used household appliances. A typical mixer or blender includes a container comprised of a collar and a jar that sits on top of an opaque polymeric base that encloses a motor. The collar includes a blending or cutting tool rotatably mounted thereto. The blending/cutting tool is rotatably engaged with a drive shaft of the motor in an operating configuration.
[0003] During operation of these appliances, lot of heat is generated. Thus, for dissipation of such heat or cooling of the motor, a radial fan is disposed therein. The radial fan comprises a disc provided with a plurality of blades spaced radially and mounted over the motor within the appliance. The appliances with such cooling arrangement are conventionally available.
[0004] IN206887B discloses a motor assembly of the mixer grinder as shown in FIG. 1A. The motor assembly includes an axial fan marked 7 fitted at the lower end 8 of the motor shaft 9 and comprising a hub 10 provided with a plurality of blades 11 spaced radially. 12 is a silencer cum air guide sleeve disposed over the motor assembly extending from the lower end up to the upper end of the motor shaft defining a clearance 12a with the motor assembly. The sleeve is of two-piece construction comprising a lower portion 13 and upper portion 14. The lower portion is fixed to the lower surface of the motor assembly mounting platform 15 provided in the housing.

[0005] During operation of the mixer grinder, the axial fan rotates with the motor shaft and sucks in the atmospheric air through the air inlets 3 into the lower portion of the silencer sleeve and throws the air upwards. Atmospheric air travels up over the motor assembly and escapes into the surroundings through the air outlets 4 via the space marked 25 between the seating collar of the mixer grinder and the upper portion of the sleeve and the space marked 26 between the upper portion of the sleeve and the housing thereby taking away the heat of the motor assembly and cooling the motor assembly. The air flow is marked by arrows.
[0006] As shown in the FIG. 1A, in the above mentioned prior art, both inlet and outlet are provided at the bottom of the mixer grinder. In such an arrangement the circulation of air within the housing of the appliance is not proper effectively as there is high chances of taking rejected air again as air inlet and outlet both are near and the circulation of air hindered by underlying mountings and thus efficient heat dissipation is not achieved.
[0007] US7942570B2A discloses a blender for blending foodstuff, as shown in FIG. 1B, which comprising a motor housing that encloses an electric motor and has a first end and a second end. An upper housing is attached to the first end of the motor housing. The motor housing includes a fan driven by the motor controlled by a plurality of switches positioned behind a flexible cover. A transparent base having translucent base feet and an open bottom partially surrounds the motor housing and has a first end. A shroud is positioned partially around the motor within the motor housing. The fan draws air through the open bottom of the base into the second end of the motor housing and the air is then directed out through the open side portion of the shroud and then sealingly vented to atmosphere.
[0008] In the above mentioned prior art, the inlet and outlets are not near. In this prior art, the air is drawn up, however, their vent to exit is provided at the side, thus in such an arrangement, the flow of air is suffering with back pressure. The Back pressure (or backpressure) is a resistance or force opposing the desired flow of fluid through pipes, leading to friction loss and pressure drop. Thus from this arrangement also, the efficient cooling cannot be achieved.
[0009] The commercially available prior arts are not capable to provide efficient heat dissipation by proper removal of air and also the design of such arrangement are very complex which makes the system complicated and expensive and also pose functional load on the manufacturers.

OBJECTS OF THE INVENTION
[0010] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
[0011] The primary object of the present disclosure is to provide a motor cooling arrangement for efficient removal of hot air around motor.
[0012] It is another object of the present disclosure to provide a motor cooling arrangement which is compact, cost effective and simple in design.
[0013] It is yet another objective of the present disclosure to provide a motor cooling arrangement, where the angle between the air directions exiting from outlets is other than 180o.

SUMMARY OF THE INVENTION
[0014] This summary is provided to introduce concepts related to a motor cooling assembly which facilitate the smooth removal of hot air by reducing back pressure and has simple and compact design. 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.
[0015] The present disclosure provides a motor cooling assembly comprising a housing having a lower part and an upper part. A motor with a shaft is mounted at the upper part of the housing. A plurality of air inlets is provided at the bottom of the lower part of the housing and a first air outlet and a second air outlet are provided at a predetermined position at the upper part of the housing. A fan is mounted with the shaft of the motor for sucking air through the plurality of air inlets. An air duct having a lower duct and an upper duct is provided. The upper duct and lower duct comprising a plurality of flanges protruded upward for receiving air sucked by fan and directing the sucked air through the air duct towards the first air outlet and the second air outlet, wherein the predetermined position of first air outlet and the second air outlet is such that the direction of air exiting from the first air outlet and direction of air exiting from the second air outlet forming an angle in the range of 100 o -170o.
[0016] An aspect of present disclosure provides that the lower duct has a sleeve with a plurality of depressions over the sleeve for being mounted on the motor.
[0017] Another aspect of present disclosure provides that the lower duct and upper duct have a plurality of male members and female members for receiving the male members for being fitted with each other.
[0018] An embodiment of the present disclosure provides that the male members of upper duct and female members of lower duct are forming snap locks for being fitted with each other.
[0019] Another aspect of present disclosure provides that the lower duct has a plurality of cavities for receiving the male members of upper duct for being fitted with each other.
[0020] Another embodiment of the present disclosure provides that the male members of upper duct and cavities in female members of lower duct are forming snap locks for being fitted with each other.
[0021] Another aspect of present disclosure provides that the upper duct has a first ring for providing engagement within the upper part of the housing.
[0022] Another aspect of present disclosure provides that the lower duct has a second ring protruded upward from the sleeve, the second ring has a groove for providing radial fitment with the upper duct.
[0023] Another aspect of present disclosure provides that the plurality of air inlets comprises a plurality of slots formed at the bottom of the lower part of the housing.
[0024] Another aspect of present disclosure provides that the first air outlet and the second air outlet comprise a plurality of slots formed at the predetermined position on the upper part of the housing.
[0025] Another aspect of present disclosure provides that the upper part of the housing has a vertical slit for removal of any spillage of fluid.
[0026] Another aspect of present disclosure provides that the angle between the direction of air exiting from the first air outlet and direction of air exiting from the second air outlet is of 120o.
[0027] Another aspect of present disclosure provides that the upper duct 400 and the lower duct 500 of the air duct 600 are made up of moldable plastic.
[0028] 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 DRAWINGS
[0029] 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. The illustrated embodiments of the subject matter 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 methods that are consistent with the subject matter as claimed herein, wherein:
[0030] FIGS. 1A and 1B illustrate a mixer and blender in accordance with state of the art;
[0031] FIG. 2 illustrates a motor cooling assembly in accordance with an embodiment of the present disclosure;
[0032] FIG. 3 illustrates the bottom isometric view of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0033] FIG. 4A and 4B illustrates the upper duct of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0034] FIG. 5A and 5B illustrate the lower duct of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0035] FIGS. 6A and 6B illustrate the air duct with connected upper duct and lower duct of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0036] FIG. 7A, 7B and 7C illustrates connecting arrangements between upper duct and lower duct of air duct of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0037] FIG. 8A, 8B and 8C illustrates exploded view and assembled view of sub-components of the motor cooling assembly in accordance with an embodiment of the present disclosure;
[0038] FIG. 9 illustrates the direction of air exiting from air outlets of the motor cooling assembly in accordance with an embodiment of the present disclosure; and
[0039] 9A and 9B illustrate the direction of air exiting from air outlets of the motor cooling assembly in accordance with prior arts;
[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 OF INVENTION
[0041] The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0042] It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
[0043] The terminology used herein is to describe particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
[0044] It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0045] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0046] In the following detailed description of the embodiments of the disclosure, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the disclosure, and it is to be understood that other embodiments may be utilized and that changes may be made without departing from the scope of the present disclosure. The following description is, therefore, not to be taken in a limiting sense.
[0047] Hereinafter, a description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary, a variety of optional components are described to illustrate the wide variety of possible embodiments of the present disclosure.
[0048] FIG. 2 shows a motor cooling assembly 100 in accordance with the present disclosure. As shown in figure, the assembly 100 comprises a housing 10 in two parts, a lower part 200 and an upper part 300. The upper part 300 has a first air outlet 330 and a second air outlet 340. The air outlets have a plurality of slots made on the upper part of the housing. The upper part 300 of the housing also has a vertical slit 350 for removal any liquid spillage from the housing of the assembly.
[0049] FIG. 3 shows the bottom part of the motor cooling assembly 100 in accordance with the present disclosure. As shown in figure, the lower part 200 of the housing which forms the bottom of the assembly has a plurality of slots 211. These slots 211 are air inlets 210 for where the air from outside is received into housing of the assembly 100 for circulating the air received from outside into the housing for removal of heat generated by motor.
[0050] FIG.4A shows the prospective views upper duct 400. FIG. 4B shows the inverted view of upper duct 400. The upper duct 400 has curved flanges 410, 420 providing air path and guide the air coming from bottom of the housing towards the air outlets 330, 340. The upper duct having a protruded first ring 440 for providing proper fitment with the assembly 100. It also has a side wall 425 protruded downward and the side wall 425, curved flanges 410, 420 having a plurality of male members 421, 422, 423, 424 for its engagement with a lower duct 500.
[0051] FIG. 5A and FIG. 5B showing the perspective and inverted perspective views of lower duct 500 respectively. The lower duct comprises curved flanges 510, 520 protruded upwards provides air path towards air outlets through enclosed sleeve 530. The sleeve 530, on its internal circumference, has various depressions for fitment with motor cooling assembly 100. The lower duct 500 has a plurality of female members 513, 514 to engage it with the male members 423, 424 of upper duct 400 respectively. It also has cavities 511, 512, to get engaged with male members 421, 422 of upper air duct 400. In the lower duct 500 there is a second ring 515 protruded upward from the sleeve 530. The second ring 515 comprises groove 540. The side boundary protruded wall 425 of upper duct 400 engages with the second ring 515 and groove 540 of lower duct 500 for better radial fitment.
[0052] FIGS. 6A shows air duct 600 with connected upper duct 400 and lower duct 500 of the motor cooling assembly 100 in accordance with an embodiment of the present disclosure. FIG. 6B shows the inverted view of the air duct 600. Upper duct 400 is placed over the lower duct 500 and they are fitted with each other by means of engagements of male members 421, 422, 423, 424 and side boundary protruded wall 425 of the upper duct 400 with the female members 513, 514, cavities 511, 512 and groove 540 of the lower duct and forming a complete air duct 600 in connected form. Both, the upper duct 400 and the lower duct 500 of the air duct 600 are made up of mouldable plastic. The curved flanges 410, 420, 510, 520 of upper duct and lower duct directed air sucked from inlets 210 to pass through the air duct towards the first air outlet 330 and the second air outlet 340.
[0053] FIG. 7A, 7B and 7C show connecting arrangements between upper duct and lower duct of air duct of the motor cooling assembly. FIG. 7A shows the engagement 610 of male member 424 of upper duct 400 with the female member 514 of the lower duct 500. FIG. 7B shows the engagement 620 where the male members 421, 422 of upper duct 400 are received by the cavities 516 of the lower duct 500. FIG. 7C shows the enlarged view of groove 540 of lower which radial fitment of side boundary protruded wall 425 of upper duct 400 with the protruded second ring 515 of the lower duct 500.
[0054] FIG. 8A shows the exploded view for motor cooling assembly 100 with along with dismounted sub-components. The motor 310 is placed along with rubber mounting 312 within the housing and which fan 320 is attached with motor shaft 311. The rubber mounting 312 is coupled to the motor 310 with the screw 315 and washer 314. A cover 316 is placed to hide screws such that it will not interact with the assembly.
[0055] FIG. 8B shows the assembled upper part 300 of the housing and FIG. 8C shows the complete motor cooling assemble has both upper and lower part of the housing where air inlets 210 provided at the bottom for air intake.
[0056] In the motor cooling assembly in accordance with present disclosure, the air inlets 210 are provided at the bottom of the lower part 200 of the housing for air intake, such that when entire assembly 100 gets activated, the air is sucked through air inlets 210 and circulating the sucked air within the housing due to negative pressure generated by fan 320. The sucked air absorbs the heat produced due to motor and becomes hot which is then collected by air duct 600. The flanges 410, 420, 510, 520 of the lower and upper ducts respectively of air duct 600 direct the sucked air towards the first air outlet 330 and the second air outlet 340 respectively. The air is then rejected through air outlets. The first air outlet 330 and the second air outlet 340 are positioned on the upper part 300 of the housing 10 such the air exiting from air outlets 330, 340 does not comes under the effect of back pressure or comes under very low effect of back pressure. The first air outlet 330 and the second air outlet 340 are positioned in such a position that the direction of air exiting from first air outlet 330 and second air outlet 340 forming an angle in the range of 20o -160o between them. Thus, a smooth removal of hot air and efficient cooling may be achieved.
[0057] In a preferred embodiment, the angle between the direction of air exiting from first outlet 330 and second air outlet 340 is 120o as shown in FIG. 9, which rejected hot air with least back pressure and ultimately gives temperature drop inside assembly 100 up to 10°-15°C. However, the direction of exiting air due to conventional assembly as mentioned in prior are shown in FIG. 9A and 9B, both of the designs are not suitable for efficient rejection of air. In both of the designs 9A and 9B, the rejected hot air will get trapped back very easily due to back pressure. Thus, there is no complete removal of hot air hence desired cooling is not achieved.
[0058] In both of the cases indicated by FIG. 9A and 9B, the upcoming hot air gets collided with the walls of the housing and push back which again obstructs the path of upcoming air. The vents for air removal are provided perpendicular from the direction of upcoming air. Thus, the perpendicular direction of air increases collision of air from the wall of housing and hindering the removal of air. The rejected air will get trapped back inside very easily due to back pressure.
[0059] In the assembly of the present disclosure, the first air outlet 330 and second air outlet 340 are positioned at such a place so that the air exiting from the first outlet 330 and second outlet 340 forms an angle between them which is in the range of 100 o -170o. In this assembly, the exiting air comes under the reduced number collisions and the rejected air comes under the effect of no or very less back pressure and thus facilitate the complete removal of hot air and maximizes cooling.
[0060] FIG. 9 shows that the first air outlet 330 and second air outlet 340 are provided at such a position on the upper part 300 of the housing 10, that the direction of air exiting from first air outlet 330 and second air outlet 340 forming an angle of 120o between them, which is one of the preferred embodiment of the present disclosure. There is least back pressure as rejected hot air have least chance to trap inside. Thus, the geometry as shown in Fig 9 is best suited to release hot air efficiency which gives a temperature drop inside assembly 100 up to 10°-15°C.
TECHNICAL ADVANTAGES
[0061] The motor cooling assembly 100 proposed herein results in following technical advantages:
(i) A better and efficient cooling is achieved by reducing back pressure and effective removal of hot air; and
(ii) Provides a compact, cost effective assembly with simple design which reduces functional pressure on manufacturers and cost of consumers.
Equivalents
[0057] The foregoing description of the preferred embodiment of the invention has been presented for the purpose of illustration and description. It is neither intended to be exhaustive, nor it is intended to limit the invention to the precise form disclosed. It will be apparent to those skilled in the art that the disclosed embodiment may be modified in light of the above teachings.

Claims:We Claim:

1. A motor cooling assembly 100 comprising
a housing having a lower part 200 and an upper part 300;
a motor 310 with a shaft 311 located at the upper part 300 of the housing;
a plurality of air inlets 210 provided at the bottom of the lower part 200 of the housing;
a first air outlet 330 and a second air outlet 340 provided at the upper part 300 of the housing;
a fan 320 mounted on the shaft 311 of the motor 310 for sucking air through the plurality of air inlets 210,
an air duct 600 having a lower duct 500 and an upper duct 400, the upper duct 400 and lower duct 500 comprising a plurality of flanges 410, 420, 510, 520 protruded upward for receiving air sucked by fan 320 and directing the sucked air through the air duct 600 towards the first air outlet 330 and the second air outlet 340,
wherein the first air outlet 330 and the second air outlet 340 is provided on the upper part 400 of the housing 10 at such a position that the direction of air exiting from the first air outlet 330 and direction of air exiting from the second air outlet 340 forming an angle between them is in the range of 100 o -170o.
2. The motor cooling assembly 100 as claimed in claim 1, wherein the lower duct 500 has a sleeve 530 with a plurality of depressions over the sleeve 530 for being mounted on the motor 310.
3. The motor cooling assembly 100 as claimed in claim 1, wherein the lower duct 500 and upper duct 400 have a plurality of male members 421, 422, 423, 424 and female members 513, 514 for receiving the male members 423, 424 for being fitted with each other.
4. The motor cooling assembly 100 as claimed in claim 3, wherein the male members 423, 424 of upper duct 400 and female members 513, 514 of lower duct 500 are forming snap locks for being fitted with each other.
5. The motor cooling assembly 100 as claimed in claim 1, wherein the lower duct 500 has a plurality of cavities 511, 512 for receiving the male members 421, 422 of upper duct 400 for being fitted with each other.
6. The motor cooling assembly 100 as claimed in claim 5, wherein the male members 421, 422 of upper duct 400 and cavities 511, 512 of lower duct 500 are forming snap locks for being fitted with each other.
7. The motor cooling assembly 100 as claimed in claim 1, wherein the upper duct 400 has a first ring 440 for providing engagement within the upper part 400 of the housing.
8. The motor cooling assembly 100 as claimed in claim 2, wherein the lower duct 500 has a second ring 515 protruded upward from the sleeve 530, the second ring 515 has a groove 540 for providing radial fitment with the upper duct.
9. The motor cooling assembly 100 as claimed in claim 1, wherein the plurality of air inlets 210 comprises a plurality of slots formed at the bottom of the lower part 200 of the housing.
10. The motor cooling assembly 100 as claimed in claim 1, wherein the first air outlet 330 and second air outlet 340 comprise a plurality of slots formed at the predetermined position on the upper part 300 of the housing.
11. The motor cooling assembly 100 as claimed in claim 1, wherein the upper part 300 of the housing has a vertical slit 350 for removal of any spillage of fluid.
12. The motor cooling assembly 100as claimed in claim 1, wherein the angle between the direction of air exiting from the first air outlet 330 and direction of air exiting from the second air outlet 340 is of 120o.
13. The motor cooling assembly 100 as claimed in claim 1, wherein the upper duct 400 and the lower duct 500 of the air duct 600 are made up of moldable plastic.