Claims:WE CLAIM:

1. Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor for Mainline Electric Multiple Unit (MEMU) / Electric Multiple Unit (EMU) application comprising of double row vents (1) accommodating a plurality of radial blades (2), wherein a hub (3) is mounted on shaft and is integrally connected to ventilator body (4), in which the ventilator body (4) comprises at least two set of blades (2) protruding radially from inner part (5).

2. The Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor as claimed in claim 1, wherein the ventilator hub (3) is configured for being mounted on the shaft that it is axially and circumferentially fixed to it.

3. The Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor as claimed in claim 1 or 2, wherein the blades (2) are provided with air deviating surfaces (6) which, during operation, guide the hot air out from the outlet of traction motor, wherein Airflow enters the motor through an inlet, cools the motor, and is radially and centrifugally expelled by the blades (2) outside through air outlet.

4. The Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor as claimed in claims 1-3, wherein the ventilator hub (3) is aerodynamically configured in an optimised manner, which guides and promotes a correct flow thereof.
, Description: “VENTILATOR WITH DOUBLE ROW VENTS TO ACHIEVE HIGHER AIRFLOW IN 3-PHASE FULLY SUSPENDED TRACTION MOTOR”

FIELD OF INVENTION:
[001] The present invention relates to development of Novel design of Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor for Mainline Electric Multiple Unit (MEMU) / Electric Multiple Unit (EMU) application.

BACKGROUND OF INVENTION/PRIOR ART:
[002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[003] For high speed MEMU/EMU application in Indian Railways, fully suspended traction motors are used which are compact in size as compared to axle hung nose suspended traction motors. These fully suspended traction motors are self-ventilated in which ventilator is provided for cooling. The ventilator provides cooling of machines by drawing cool air from the inlet and throwing hot air through outlet. Ventilator is centrifugal type and assembled on shaft of traction motor by shrink fit method.

[004] Traction motors operate in extreme temperature conditions and are subjected to varying loads, and are often required to work on maximum rating for a long time causing very high temperatures inside motor. Due to high temperature generated during operation of traction motor, performance and life of traction motor may be affected. In order to prevent such high temperature, higher airflow is required from ventilator.
[005] One of the major limitations faced in development of new traction motors is development of suitable ventilator which can generate desired airflow and be able to limit the temperature rise of traction motor. Further, traction motor is to be fitted in a narrow space within a bogie, hence ventilator should have compact dimensions.

[006] At present, the ventilators used in traction motors are with single row vents as illustrated in figure-1. For compact traction machines where the operational requirement is stringent, ventilators with single row vent may not be able to generate desired airflow and hence can cause high temperature rise of machine during service. Hence, it would be desirable to improve the existing ventilator by providing a technical solution having increased aerodynamics performances, which is able to better overcome the system harmful conditions described above thus prolonging the operative life of the traction motor. As this ventilator is to be used in fully suspended traction motor for MEMU/EMU, due to space constraint, ventilator is to be designed in existing space envelope. The present invention proposes newly designed ventilator with same space envelop which generates higher airflow as compared to existing ventilator, thereby eliminating the possibility of high temperature rise.

OBJECTS OF INVENTION:

[007] Primary object of the invention is to provide Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor for Mainline Electric Multiple Unit (MEMU) / Electric Multiple Unit (EMU) application, which obviates shortcomings of the prior art(s).

[008] Another object of the invention is to provide Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor, which is simple in construction.

[009] Still another object of the invention is to provide Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor, which can generate higher airflow in fully suspended traction motor suitable for operation at higher speed thereby higher rating motor can be designed without affecting overall size of motor.

[0010] Yet another object of the invention is to provide Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor, which can be incorporated in the available space envelop of existing arrangement to minimize changes.

[0011] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.

SUMMARY OF THE INVENTION:

[0012] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus/composition and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.

[0013] According to this invention, there is provided Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor for Mainline Electric Multiple Unit (MEMU) / Electric Multiple Unit (EMU) application, which comprises the following:
- Double row vents (1) to achieve higher airflow;
- Double set of radial blades (2) with increased aerodynamics;
- Double row vents (1) accommodating a plurality of radial blades (2);
- Ventilator body (4) having an inner part (5) which is integral to hub (3) and blades (2) protruding from said inner part (5);
- Two set of blades (2) are provided with air deviating surfaces (6) which, during operation, guide the hot air out from the outlet of traction motor.

[0014] 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.

[0015] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.

[0016] 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 ACCOMPANYING DRAWINGS:

[0017] 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 processes that are consistent with the subject matter as claimed herein, wherein:-
Fig.1 shows: the cross sectional view of existing ventilator used in 3-phase Induction traction motor for MEMU in accordance with the prior art.

Fig.2 shows: the cross sectional view of developed ventilator for use in 3-phase fully suspended traction motor for MEMU according to the present invention.

Fig.3 shows: Structural analysis through Ansys Mechanical conducted to ensure design as per functional requirements.

Fig.4 shows: CFD analysis of the above new design also completed to assess and ensure proper mass flow rate generated by the ventilator.

[0018] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily 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 PREFERRED EMBODIMENT OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS:

[0019] 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.

[0020] The invention makes a disclosure regarding a technology pertaining to Ventilator with double row vents to achieve higher airflow in 3-phase fully suspended traction motor for Mainline Electric Multiple Unit (MEMU) / Electric Multiple Unit (EMU) application.

[0021] Now, reference may be made to figure 2 illustrating developed double row vents ventilator suitable to be assembled in fully suspended traction motor for MEMU/EMU application. In the new developed design of ventilator, double row vents (1) and radial blades (2) with increase aerodynamics are provided to achieve higher airflow. Ventilator comprises a hub (3) to be mounted by shrink fit on shaft through mechanical interference and is integrally connected to ventilator body (4). The ventilator hub (3) is configured for being mounted on the shaft in such a way that it is axially and circumferentially fixed to it. The ventilator body (4) comprises two set of blades (2) protruding radially from inner part (5). The blades (2) are provided with air deviating surfaces (6) which, during operation, guide the hot air out from the outlet of traction motor. Airflow enters the motor through an inlet, cools the motor, and finally is radially and centrifugally expelled by the blades (2) outside through air outlet. The geometrical and dimensional configuration have been optimized through CFD (Computational Fluid Dynamic) and FEM (Finite elements method) analyses. Additionally, the ventilator hub (3) is aerodynamically configured in an optimised manner, which does not block ventilation air, but, on the contrary, guides and promotes a correct flow thereof. The ventilator proves to be aerodynamically more effective with higher mechanical reliability.

DIFFERENTIAL FEATURES OF THE INVENTION:
Prior ART Present Invention Remarks/Advantages
Single row vents are provided in ventilator for generating airflow in traction motor. - New design of ventilator has been developed by introduction of double row vents, which allows higher flow of air in the traction motor.
-Higher airflow in same envelop of ventilator with double vents as compared to single row vent ventilator.
-It is possible to design higher rating traction motor by use of double row vents ventilator in same envelope of traction motor.

CONCLUSION:

[0022] With the successful development of this novel design ventilator, higher airflow can be achieved in same envelop of ventilator. Thus, it is possible to design higher rating traction motor without changing its overall size.

WORKING OF THE INVENTION:

[0023] Ventilator is mounted at one end of the rotor shaft by shrink fit, cools the motor by suction of hot air produced by electrical heating generated during operation of motor, and discharges the same to atmosphere. In the present invention, the quantity of air sucked and discharged is higher as compared to convention single row ventilator used in traction motors.

TEST RESULT:

- Structural analysis through Ansys Mechanical conducted to ensure design as per functional requirements as shown in figure 3.

- CFD analysis of the above new design also completed to assess and ensure proper mass flow rate generated by the ventilator as illustrated in figure 4.

[0024] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.

[0025] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

[0026] 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 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 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 by the indefinite articles “a” or “an” limits any particulars 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 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 two or more recitations). Furthermore, in those instances where a convention analogues 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 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, 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 both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.

[0027] The above description does not provide specific details of 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.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present 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.

[0029] 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.

[0030] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.