FIELD OF INVENTION:
[001] The present subject matter described herein, relates to a pump set motor assembly for preventing contaminant ingress in a pump set, and, in particular to, an 5 assembly of two end shields, and pump shaft for preventing the contaminant ingress in the pump set.
BACKGROUND AND PRIOR ART:
[002] Generally, water pump sets are known which comprise a pump housing and a pump shaft that is concentrically and rotatably disposed in the pump housing, an 10 antifriction bearing fixedly provided on both ends of the pump shaft, and a mechanical seal provided between the housing and the pump shaft and positioned between the antifriction bearing and an impeller. By driving a pulley with a belt, the impeller is rotated to circulate cooling water.
[003] US 4,824,324 A discloses a water pump comprising a pump shaft having an 15 impeller and mounted on one end of a pump housing with a seal provided there between, a stationary shaft in alignment with the pump shaft and supported at its one end by the other end of the pump housing, a pulley for reeving a belt there around provided around the outer ring of an antifriction bearing mounted around the stationary shaft within the housing, and a water-tight flange positioned between 20 the seal and the bearing and fixedly provided between the end portion of the pump shaft and the end portion of the pulley. However, it does not have any winding so no burning related issue in it.
[004] The existing pump set does not describe two end shields and pump shaft designed to accommodate seal such that the contaminant passing through the 25 mechanical seal exerts a direct influence on the bearing and motor winding to cause damage to the pump set. Stated more specifically, the seal portion develops heat through friction because of the construction of the seal, allowing the heat to vaporize water in the vicinity of the seal portion and permitting the water vapor to
3
pass through the seal. The water vapor passing through the seal immediately condenses to water droplets, which adhere to the end face of the antifriction bearing opposed to the seal. Thus, contaminants pass through the seal and enters the bearing. Consequently, the bearing becomes damaged owing to corrosion or improper lubrication to render the pump set inoperative The existing pump set can be failure 5 due to water ingress is common issues in the surface pump set such that the issues are prominent in rainy season when the water pump gets fully or partially submerged in the water. The contact of contaminant like water with motor winding causes short circuit, which leads to motor failure and customer safety related issues.
[005] The information disclosed in this background of the disclosure section is 10 only for enhancement of understanding of the general background of the invention. However, none of the prior-art documents deals with the arrangement of two end shields, and pump shaft to accommodate seal which prevents contaminant ingress in pump set even in complete submerged condition.
OBJECTS OF THE INVENTION: 15
[006] The principal objective of the present invention is preventing contaminant ingress of pump set even in complete submerged condition.
[007] Another object of the present invention is to provide an improved contaminant tight construction for a sealing arrangement in the pump set.
[008] Yet another object of the present invention is to provide a simple and cost 20 effective pump set with improved performance and efficiency of the pump set.
SUMMARY OF THE INVENTION:
[009] The present subject matter relates to a pump set motor assembly for preventing contaminant ingress in a pump set. The pump set motor assembly comprises a motor housing and a pump shaft that is rotatably and coaxially installed 25 in the motor housing such that the pump shaft is positioned between two end shields, where the end shields have ears or lugs for receiving bolts securely to connect the motor housing. Further, the pump set motor assembly comprises a pair of sealing members positioned between the end shields and the pump shaft, wherein
4
the pair of sealing members is positioned around the pump shaft to prevent the contaminant ingress in the pump set.
[0010] Accordingly, the pump set assembly further comprises a plurality of antifriction bearings which is fixedly provided between the end portions of the pump shaft. Preferably, the sealing member is referred as a rotary seal. 5
[0011] In accordance with a diameter of the one end portion of the pump shaft is a range of 12 mm - 17 mm. Similarly, a diameter of the another end portion of the pump shaft is a range of 15 mm - 20 mm.
[0012] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference 10 to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] 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 15 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, the left-most digit(s) of 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 20 embodiments of system or methods 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:
[0014] Fig. 1 illustrates perspective view of pump set motor assembly with rotary seals, in accordance with the present subject matter; 25
[0015] Fig. 2 illustrates an exploded view of pump set motor assembly with rotary seals, in accordance with the present subject matter;
[0016] Fig. 3 illustrates a perspective view of pump shaft as shown in Fig. 2, in accordance with the present subject matter;
5
[0017] Fig. 4 illustrates sectional view of rotary seal in a pump set, in accordance with an embodiment of the present subject matter; and
[0018] Fig. 5a, 5b and 6a, 6b illustrate diagrammatic and sectional views of end shields of the pump set, in accordance with an embodiment of the present subject matter. 5
[0019] 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. 10
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0020] The present subject matter relates to a pump set motor assembly for preventing contaminant ingress in a pump set. The pump set motor assembly comprises a motor housing and a pump shaft that is rotatably and coaxially installed in the motor housing such that the pump shaft is positioned between two end 15 shields, and a pair of sealing members positioned between the end shields and the pump shaft, wherein the pair of sealing members is positioned around the pump shaft to prevent the contaminant ingress in the pump set.
[0021] In accordance with the pump set assembly further comprises a plurality of antifriction bearings which is fixedly provided between the end portions of the 20 pump shaft, where a diameter of the one end portion of the pump shaft is a range of 12 mm - 17 mm, similar to a diameter of the another end portion of the pump shaft is a range of 15 mm - 20 mm.
[0022] 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 25 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
6
described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. 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 constructed as 5 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. 10
[0023] 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 15 of the present subject matter and are included within its scope.
[0024] Fig. 1 illustrates perspective view of pump set motor assembly with a pair of rotary seals, in accordance with an embodiment of the present subject matter. The pump set assembly 100 comprises a motor housing 101 provided with a peripheral flange having a plurality of apertured ears or lugs thereon for mounting 20 together, with a central axial cavity and having a pump shaft 102. The peripheral flange is fastened by bolts to a flange cover 110 of the pump set. This arrangement adds to the strength of the motor housing 101. The pump shaft 102 is rotatably and coaxially installed in the motor housing 101 such that the pump shaft 102 is in the form of a solid or a hollow cylinder. The pump shaft 102 is made of hardened steel 25 or other related material and is provided with a pair of antifriction bearings 107, 108.
[0025] Referring to figure 2 illustrates exploded view of pump set motor assembly with a pair of rotary seals, in accordance with the present subject matter. The pump shaft 102 is positioned between two end shields 103, 106 which are mounted on 30
7
either sides of the housing (101) that the end shields 103, 106 are provided with a pair of sealing members 104 that is positioned around the pump shaft 102 to prevent the contaminant ingress in the pump set.
[0026] Referring to figure 3 illustrates perspective view of pump shaft in a pump set assembly, in accordance with the present subject matter. The pump shaft 102 5 has the end portions 102a, 102b wherein a diameter of one end portion 102a in a range of 12 mm - 17 mm, and a diameter of the another end portion 102b of is a range of 15 mm - 20 mm. Surface roughness and the diameter of pump shaft 102 is to be maintained such that surface roughness of the pump shaft 102 is a range of 0.8 Ra - 1.6 Ra. 10 [0027] In accordance with the present subject matter relates to the pump set motor assembly 100 having a pair of sealing members 104 which is positioned between the two end shields 103, 106 and the pump shaft 102 and mounted on a seal seat (104a, 104b) provided on the end shields (103, 106), where the pump shaft 102 does not wear and tear the pair of sealing members 104, therefore the pump set can run 15 reliably for a long period of time. The pair of sealing members 104 is preferably rotary type seal, which is made of rubber, Nitrile rubber, Fluoro rubber, Silicone, Ceramic, and Teflon.
[0028] Referring to figure 4 illustrates sectional view of the rotary seal, in accordance with an embodiment of the present subject matter. The pair of sealing 20 members 104 is provided at end portions of the antifriction bearings 107, 108 such that the pair of sealing members 104, hereafter referred to as the rotary seals 104, does not stop rotational motion from the pump shaft 102 and the motor housing 101., therefore the rotary seals 104 can be used in oscillating or rotating parts in which the primary function of the rotary seals 104 is to prevent the ingress of 25 contaminants such as water, mud, oil, dust and moisture.
[0029] Referring to figure 5a, 5b and 6a, 6b illustrate diagrammatic and sectional view of end shields, in accordance with an embodiment of the present subject matter. The end shields 103, 106 are made from high grade cast iron or other related material for exceptional strength and corrosion resistance such that the end shields 30
8
103, 106 are accurately machined to close tolerance in order to ensure rigid alignment and minimum vibration. The end shields 103, 106 are formed with the plurality of ears or lugs 103a and 106a for securely receiving bolts to connect the motor housing 101. The rotary seals 104 are placed in an inside surface (104a, 104b) of the end shields 103, 106 respectively. 5
[0030] Accordingly, the pump set motor assembly 100 further comprises an impeller 105 that is mounted on one end portion 102a of the pump shaft 102 in the motor housing 101 with the rotary seals 104 provided there between such that the impeller 105, press-formed in a suitable shape, is bent at its outer peripheral portion to provide a plurality of blades. Moreover, an integral structure of the impeller 105 10 and the pump shaft 102 has improved accuracy and eliminates the likelihood that the impeller 105 will slip off the pump shaft 102.
Advantages of the Invention over prior art:
[0031] The present structure of pump set motor assembly prevents the contaminant ingress in the pump set even in complete submerged condition and avoids the motor 15 failures in the surface pump set, also improves the customer safety by preventing short circuit of the surface pump set.
[0032] 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, 20 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. 25

WE CLAIM:
1. A pump set motor assembly (100) for preventing contaminant ingress, the pump set motor assembly (100) comprising:
a motor housing (101); a pump shaft (102) rotatably and coaxially installed in the motor 5 housing (101) such that the pump shaft (102) is coaxially positioned between two end shields (103, 106), where the two end shields (103, 106) have ears or lugs (103a, 106a) for receiving bolts securely to connect the motor housing (101);
characterized in that 10
a pair of sealing members (104) which is positioned between the end shields (103, 106) and the pump shaft (102) and mounted on a seal seat (104a, 104b) provided on the end shields (103, 106);
wherein the pair of sealing members (104) is positioned around the pump shaft (102) to prevent the contaminant ingress in the pump set. 15
2. The pump set motor assembly (100) as claimed in claim 1, wherein the pump shaft (102) does not wear and tear the pair of sealing members (104).
3. The pump set motor assembly (100) as claimed in claim 1, wherein the pump shaft (102) is in the form of a solid or a hollow cylinder.
4. The pump set motor assembly (100) as claimed in claim 1, wherein the end 20 shields (103, 106) are mounted on either sides of the housing (101).
5. The pump set motor assembly (100) as claimed in claim 1, wherein the pump set motor assembly (100) further comprising an impeller (105) that is mounted on the one end portion (102a) of the pump shaft (102).
10
6. The pump set motor assembly (100) as claimed in claim 1, wherein further comprising a pair of antifriction bearings (107, 108) which is fixedly provided between the end portions (102a, 102b) of the pump shaft (102).
7. The pump set motor assembly (100) as claimed in claim 1, wherein the pair of sealing members (104) is a type of rotary seal. 5
8. The pump set motor assembly (100) as claimed in claim 1, wherein diameter of the one end portion (102a) of the pump shaft (102) is a range of 12 mm - 17 mm.
9. The pump set motor assembly (100) as claimed in claim 1, wherein diameter of the another end portion (102b) of the pump shaft (102) is a range of 15 mm 10 - 20 mm.
10. The pump set motor assembly (100) as claimed in claim 1, wherein surface roughness of the pump shaft (102) is a range of 0.8 Ra - 1.6 Ra.
11. The pump set motor assembly (100) as claimed in claim 6, wherein the rotary seal (104) is made of rubber, Nitrile rubber, Fluoro rubber, Silicone, Ceramic, 15 Teflon.
12. The pump set motor assembly (100) as claimed in claim 1, wherein the contaminant is water, mud, oil, dust and moisture.