WO2017175189A1

WO2017175189A1 - A water pump with separator and seal to protect rotor

Info

Publication number: WO2017175189A1
Application number: PCT/IB2017/052014
Authority: WO
Inventors: Kabir BHANDARI; Torsten Gerlich; Amardip KUMAR; Kumar Abhishek; Navdeep DAHIYA
Original assignee: Padmini VNA Mechatronics Pvt Ltd
Current assignee: Padmini VNA Mechatronics Pvt Ltd
Priority date: 2016-04-07
Filing date: 2017-04-07
Publication date: 2017-10-12
Anticipated expiration: 2018-10-07
Also published as: EP3440362A1; EP3440362A4

Abstract

A customized water pump is provided with separator and seal to protect the rotor against foreign particles from cooling circuit. A customized water pump with at least one separator placed between cooling circuit and rotor which blocks all the coolant to enter into rotor area; and at least one rotary shaft seal used between rotating and stationary components or between two components in relative motion.

Description

A WATER PUMP WITH SEPARATOR AND SEAL TO PROTECT ROTOR

FIELD OF THE INVENTION

The present invention provides customized water pump with separator and seal to protect the rotor against foreign particles from cooling circuit. More specifically, the invention provides customized water pump with at least one separator placed between cooling circuit and rotor which blocks all the foreign particles specially iron particles to enter into rotor area; and at least one rotary shaft seal used between rotating and stationary components or between two components in relative motion. BACKGROUND OF THE INVENTION

The water pump in a motor vehicle, pumps coolant through a coolant circuit of an internal combustion engine, having a pump housing, a rotatably mounted in the pump housing the impeller, flow channels in the pump housing for the coolant, and at least one is mounted in the pump housing, axially displaceable pot for adjusting the output of the pump.

The coolant that gathers between the impeller blades travels outward using centrifugal force, and suction draws the coolant into the water pump from the radiator.

The water pump installed in a motor vehicle pushes coolant through the engine block to convectively draw the engine heat away from the system. After the coolant enters the water pump, it goes through the whole engine, where it absorbs the heat that the combustion process produces, and then it goes to the radiator, so the heat can exit to the outside air. US5785013 discloses an electrically driven coolant pump for an internal combustion engine comprising of a centrifugal pump for pumping a coolant, an electrical drive means for driving the pump, said electrical drive means including an electrically commutated brushless D.C. motor, and electronic circuit means connected to the D.C. motor to operate the motor in accordance with signals delivered to said electronic circuit means from an external power source, and a cooling body operatively positioned to cool said electronic circuit means by transferring heat from said electronic circuit means to said coolant, centrifugal pump including a pump housing and said electrical drive means including a motor having a stator with a stator housing, bolt means connecting said pump housing and said stator housing together through said cooling body, said cooling body being connected by said bolt means to said pump housing to be cooled by the coolant pumped by the pump, said electronic circuit means being connected by said bolt means to said cooling body in heat exchange relation therewith. The main drawback of these pumps is that the foreign particles from the cooling circuit flows into the rotor part and causes damage.

One of the most common reasons for the motor vehicle's water pump not working properly is the contamination in the cooling fluid. Fluid contamination often brings abrasive items in contact with the rotor & due to magnet effect it attracted to rotor and increases its outer diameter which leads to damage rotor casing when rotating at high rpm to fail prematurely.

Therefore, there is technological gap wherein measures to protect and prevent abrasive items to come in contact with the rotor, is either inadequate or not at all implemented.

OBJECT OF THE INVENTION Accordingly, the main object of the invention is to provide a customized water pump with separator and seal to protect the rotor against foreign particles from the cooling circuit. Yet another object of the invention is to provide customized water pump with a separator placed between cooling circuit and rotor which blocks all the particles to enter into rotor area, preferably made up of non-corrosive durable material such as thermoplastics or any austenitic stainless steel or materials alike.

Yet another object of the invention is to provide customized water pump with at least one rotary shaft seal used between rotating and stationary components or between two components in relative motion. Yet another object of the invention is to provide customized water pump with at least one cylindrical outer covering of sheet steel case that has the requisite interference fit to seal statically against the housing bore.

Yet another object of the invention is to provide customized water pump with at least one sealing lip made of an elastomeric or thermoplastic material that seals dynamically and statically against the rotating shaft.

BRIEF DESCRIPTION OF THE DRAWING A complete understanding of the system and method of the present invention may be obtained by reference to the following drawings:

Fig. 1 elucidates the exploded perspective view of the water pump according to the present invention;

Fig. 1(a) elucidates the arrangement of aconventional water pump;

Fig. 2 elucidates the arrangement of customised water pumpaccording to the present invention;

Fig. 3 elucidates the arrangement of the conventional water pump, wherein the movement of fluid is directed around the rotor; Fig. 4 elucidates the arrangement of customised water pump according to the present inventionwherein customised arrangement of water pump restricts the particles entering; and

Fig. 5(a) elucidates the design of at least one separator according to the present invention, made up of thermoplastics or any austenitic stainless steel that separates Coolant from rotor area and also have slot in its design to guide sealing lip.

Fig. 5(b) elucidates the design of at least one sealing lip,according to the present invention, preferably made of an elastomeric or thermoplastic material that seals dynamically and statically against the rotating shaft. SUMMARY OF THE INVENTION

The present invention provides customized water pump with separator and seal to protect the rotor against foreign particles from cooling circuit. The invention improves the durability and robustness of the product to a great extent by providing a complete sealing of the rotor, shielding it completely from the external particles in working fluid, by the help of the separator & rotary shaft seal. In an embodiment of the present invention the improvement in the water pump includes customized sealing with two major components: l. Separator: A separator is lined between cooling circuit and rotor which blocks all the coolant to enter into rotor area, preferably made up of non-corrosive durable material such as thermoplastics or any austenitic stainless steel or materials alike.

2. Rotary Shaft Seal: Radial shaft seals are used between rotating and stationary components or between two components in relative motion, comprising of two main parts: a) A cylindrical outer covering of sheet steel case that has the requisite interference fit to seal statically against the housing bore; and

b) A sealing lip made of an elastomeric or thermoplastic material that seals dynamically and statically against the rotating shaft.

DETAILED DESCRIPTION OF THE INVENTION

The present invention will now be described more fully hereinafter with reference to the accompanying drawings in which a preferred embodiment of the invention is shown. This invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough, and will fully convey the scope of the invention to those skilled in the art.

The present invention relates to a water pump for conveying a coolant, in particular for use in the cooling circuit of the internal combustion engine of motor vehicles. Fig. 1 elucidatesan exploded viewof the customized water pump 100 to provide effective sealing of the rotor part from any foreign particles present in the cooling circuit. The customized water pump 100 comprises of at least one volute casing 103; at least one shrouded impeller 104; at least one shaft 105; at least one rotary shaft seal 102; at least one separatorlOl; at least one rotor assembly 106; a plurality of screws 107; at least one rotor casing 108; at least one statorl09; a pluralty of terminals 110; a cover 112 before a housing 111 and another cover 113 placed on the other side of the housing 113 and at least one grommet 114; wherein the volute casing 103 receives the coolant pumped by the impeller 104; the rotary shaft seal 102 and separator 101 are assembled between the rotor assembly 106 and impeller 104 wherein the rotary shaft seal 102 is mounted with interference on inner diameter of the separator 101. As the rotary casing 108 and volute casing 103 are assembled and screwed with a plurality of screws 107, the separator 101 becomes fixed. Also, the rotary shaft seal 102 is stationary and fixed from the outer periphery and will be in contact with rotating shaftl05 from the inner surface to prevent the flow of foreign particles and abrasive particles from causing any damage to rotor 104 and rotor casing 108. The complete assembly including rotor assembly 106, shaft 105, rotary shaft seal 102 and separator 101 are mounted on the guiding pin 115 and rotates around guiding pin 115 during operation.

FIG. 1(a) elucidates the conventional arrangement of the water pump, the figure clearly highlights that there is no sealing arrangement and system between the cooling circuit and rotor. The absence of sealing arrangement causes the abrasive particles come in contact with the rotor part leading to damage.

FIG. 2 elucidates the arrangement of customised water pump. According to the most preferred embodiment water pump 100 provides customized sealing with two major components: at least one separator 101 is inserted between cooling circuit and rotor which blocks all the coolant to enter into rotor area, preferably made up of non-corrosive durable material such as thermoplastics or any austenitic stainless steel or materials alike and at least one rotary shaft seal 102 which is in contact with rotating shaft 105 and prevents any damage to rotor or rotor casing preferably made of elastomeric or thermoplastic material.

FIG. 3 elucidates the arrangement of the conventional water pump, wherein the movement of fluid is directed around the rotor.

FIG. 4 elucidates the arrangement of customised water pump wherein customised arrangement in water pump restricts the fluid entering the rotor area, by incorporating separator 101 and rotary shaft seall02. FIGS. 5(a) & 5(b) elucidates separator 101 androtary shaft seal 102 used between rotating and stationary components or between two components in relative motion in the arrangement of customized water pump comprising of two main parts:

Fig. 5(a) shows position of at least one cylindrical outer covering of sheet steel case i.e. separator 101 that has the requisite interference fit to seal statically against the housing bore; and

Fig. 5(b) shows the position of at least one sealing lip, preferably made of an elastomeric or thermoplastic material i.e. rotary shaft seal 102 that seals dynamically and statically against the rotating shaft.

Although the invention has been illustrated and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification and the annexed drawings. In addition, while a particular feature of the invention may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given or particular application. The names are purely indicative and are provided just to best describe the nature of the invention.

Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

Claims

CLAIMS We claim:

1. A customized water pump assembly comprising:

a) at least one volute casing 103;

b) at least one shrouded impeller 104 to impell a coolant;

c) at least one shaft 105;

d) at least one rotary shaft seal 102;

e) at least one separator 101;

f) at least one rotor assembly 106;

g) a plurality of screws 107;

h) at least one rotor casing 108;

i) at least one stator 109;

j) a pluralty of terminals 110;

k) a cover 112 before a housing 111 and another cover 113 placed on the other side of the housing 113; and

1) at least one grommet 114; wherein: the volute casing 103 receives the coolant impelled by the impeller 104; the rotary shaft seal 102 and separator 101 are assembled between the rotor assembly 106 and impeller 104 wherein the rotary shaft seal 102 is mounted with interference on an inner diameter of the separator 101; the rotary casing 108 and volute casing 103 are assembled and screwed with the plurality of screws 107, thus making the separator 101 static; the rotary shaft seal 102 is stationary and fixed from the outer periphery and is in contact with rotating shaft 105 from the inner surface to prevent the flow of foreign particles and abrasive particles from causing any damage to the rotor 104 or rotor casing 108; the pump assembly including rotor assembly 106, shaft 105, rotary shaft seal 102 and separator 101 are mounted on the guiding pin 115 and rotates around guiding pinll5 during operation.

The water pump assembly as claimed in claim 1 wherein the assembly is installed in a cooling circuit of internal combustion engine of motor vehicles.

The water pump assembly as claimed in claim 1 wherein the separator is made of stainless steel.

The water pump assembly as claimed in claim 1 wherein the seal is made of thermoplastic material.