EP4143442B1 - Wasserpumpe für motorkühlsystem - Google Patents

Wasserpumpe für motorkühlsystem

Info

Publication number
EP4143442B1
EP4143442B1 EP21721830.4A EP21721830A EP4143442B1 EP 4143442 B1 EP4143442 B1 EP 4143442B1 EP 21721830 A EP21721830 A EP 21721830A EP 4143442 B1 EP4143442 B1 EP 4143442B1
Authority
EP
European Patent Office
Prior art keywords
water
water pump
pump
water seal
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21721830.4A
Other languages
English (en)
French (fr)
Other versions
EP4143442A1 (de
Inventor
Baocheng Zhang
Guoping Tian
Gengxin Liu
Mengxue QIN
Yan Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Motoren GmbH and Co KG
Original Assignee
Caterpillar Motoren GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Motoren GmbH and Co KG filed Critical Caterpillar Motoren GmbH and Co KG
Publication of EP4143442A1 publication Critical patent/EP4143442A1/de
Application granted granted Critical
Publication of EP4143442B1 publication Critical patent/EP4143442B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0204—Filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/028—Deaeration devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/0285—Venting devices

Definitions

  • the invention relates to the field of mechanical pumps, in particular to a water pump used for an engine cooling system.
  • an engine cooled by a coolant usually requires a water pump to provide a suitable flow rate and head.
  • a water seal is usually required to seal the water pump bearing and the pump body.
  • the water seal of the water pump usually includes bellows seat, bellows, spring seat, spring, static ring, dynamic ring, auxiliary sealing ring, etc.
  • the static ring of the water seal is always attached to the dynamic ring of the water seal to form a seal of the coolant.
  • the local fluidity of the water seal is not uniform, which leads to a rise of the local temperature.
  • the gas is gathered in the water seal cavity in the process of filling coolant to the engine, causing bubbles to accumulate on the water seal surface to affect the cooling and lubrication of the water seal.
  • foreign particles enter the friction surface of the water seal or nearby, they are easy to scratch the water seal components and destroy the flatness and roughness of the sealing surface of the water seal, finally resulting in sealing failure of the water seal.
  • the present invention aims to provide a water pump that can overcome one or more of the above-mentioned problems in the prior art.
  • DE 517 824 C shows a radial pump comprising a pump housing, an impeller seated on a shaft, an impeller seal on the suction side and an impeller seal on the discharge side.
  • the impeller comprises oblique openings acting as balance holes to accommodate for pressure differences between the front and rear side of the impeller.
  • WO 2019/043730 A1 refers to an impeller with a front-shroud plate on a suction side and a back-shroud plate on a pressure side.
  • the impeller may comprise an oblique flow passage through which retained fluid in the pressure side may be transferred back to a plurality of impeller vanes.
  • the present invention proposes a water pump for an engine cooling system, which can improve the flow field distribution around the water seal, avoid the accumulation of foreign matter, bubbles, or the like on the surface of the water seal, thereby improving the cooling and lubrication effects of the water seal and effectively prolonging the service life of the water seal and the water pump.
  • a water pump for an engine cooling system comprising: a water pump housing defining a water sealing hole; a pump shaft rotatably supported in the water pump housing; a water seal sleeved on the pump shaft and positioned in the water sealing hole; an impeller sleeved on the pump shaft and close to the water seal, the impeller comprising a disc, blades arranged on a side of the disc away from the water seal, and at least one balance hole penetrating both end sides of the disc, wherein a central axis of the balance hole is coplanar with a central axis of the pump shaft and inclined at a certain angle with respect to the axis of the pump shaft, and a radial distance of a point on the central axis of the balance hole from the axis of the pump shaft gradually decreases as the point approaches the water seal.
  • a first annular inner chamber is arranged between the water seal and a side of the disc facing away from the blades around the pump shaft, and a port of the balance hole close to the water seal is connected to the first inner chamber.
  • At least one flushing channel extending in the radial direction is provided in a seat portion of the water pump housing that defines the water sealing hole, wherein a first port of the flushing channel passes through a wall of the water sealing hole into the water sealing hole , a second port of the flushing channel is connected to a second outer chamber, which is in fluid communication with a peripheral chamber defined between the periphery of the impeller and the water pump housing.
  • the balance hole in the form of an oblique hole facilitates the flow of water on the surface of the water seal, improves the flow field distribution near the water seal, and improves the lubrication and cooling effects of the water seal.
  • the central axis of the balance hole is inclined at an angle of about 26 degrees with respect to the axis of the pump shaft.
  • the first annular inner chamber is arranged between the water seal and the side of the disc facing away from the blades around the pump shaft, and the port of the balance hole close to the water seal is connected to the first inner chamber.
  • the at least one flushing channel extending in the radial direction is provided in the seat portion of the water pump housing that defines the water sealing hole, wherein the first port of the flushing channel passes through the wall of the water sealing hole into the water sealing hole, the second port of the flushing channel is connected to the second outer chamber, which is in fluid communication with the peripheral chamber defined between the periphery of the impeller and the water pump housing.
  • the second outer chamber is located on a side of the disc that faces away from the blades and is radially outward with respect to the first inner chamber.
  • the first port of the flushing channel leads to an area where a friction surface of the water seal is located.
  • a venting channel is provided in a top area of the seat portion, one port of the venting channel is provided in a wall of the flushing channel located at the top of the seat portion, and another port of the venting channel is configured to lead to a top area of the first inner chamber disposed between the water seal and the disc of the impeller.
  • venting channel extends substantially parallel to the axis of the pump shaft, or inclines upward as it extends away from the first inner chamber.
  • the water pump for the engine cooling system significantly improves the cooling and lubrication effects of the water seal, and by virtue of the improved flow field distribution near the water seal, avoids the accumulation of foreign matter such as particles or bubbles between the sealing surfaces of the water seal, improves the sealing performance of the water seal, prolongs its service life, and reduces its failure rate.
  • arranging the balance hole in the form of an oblique hole on the disc of the impeller and arranging the flushing channel and the venting channel on the seat portion of the water pump housing require a simple and cost-effective manufacturing process.
  • Fig. 1 shows a cross-sectional view of a water pump for an engine cooling system according to the present invention.
  • the water pump 1 comprises a water pump housing 11 and a pump shaft 12, wherein the pump shaft 12 is rotatably supported in the water pump housing 11.
  • a drive shaft is connected to one end of the pump shaft 12, and the drive shaft inputs power from a power device (not shown) to the pump shaft 12 to drive the pump shaft 12 to rotate.
  • the water pump housing 11 includes a seat portion 111 and a body portion 112 hermetically connected with the seat portion 111.
  • a bearing hole 1111 and a water sealing hole 1112 are defined at corresponding positions of the seat portion 111, and the bearing 13 is installed in the bearing hole between the pump shaft and the seat portion.
  • a water seal 14 is sleeved on the pump shaft 12 on the side of the bearing 13 away from the drive shaft.
  • the water seal 14 is installed in the water sealing hole 1112 between the pump shaft 12 and the seat portion 111.
  • An impeller 15 is sleeved at an end of the pump shaft 12 adjacent to the water seal, and the impeller 15 is positioned in the impeller chamber 1120 defined by the body portion 112 of the water pump housing 11.
  • the water seal 14 is configured to seal the area on the side where the bearing 13 is located with respect to the area on the side where the impeller 15 is located, thereby preventing the coolant (for example, water) from entering the area on the side where the bearing 13 is located.
  • the impeller 15 includes a disc 151 and blades 152 provided on the disc.
  • the side of the disc where the blades are provided is referred to as the "front surface of the disc", and the side opposite to the front surface is referred to as the "back surface of the disc”.
  • the rotation of the pump shaft 12 drives the impeller 15 to rotate together, and then pressurizes the water (i.e., the coolant) flowing in from the pump inlet 11a by means of centrifugal force, and then discharges the pressurized water from the pump outlet 11b, thereby pumping the pressurized water to the engine cooling system for circulation.
  • the water seal 14 is approximately located at an end area of the seat portion 111.
  • a boss 1115 is provided in an area of the seat portion 111 close to the water sealing hole 1112.
  • An end surface of the boss is provided with a step hole 1116 coaxial with the water sealing hole.
  • An annular flange 153 extends from the disc 151 in the circumferential direction on a side of the impeller 15 close to the water seal (i.e. the back surface), and the annular flange 153 extends into the step hole 1116.
  • An annular gap is provided between the outer circumferential surface of the annular flange 153 and the inner circumferential surface of the large aperture portion of the step hole to ensure that the rotation of the impeller is not disturbed.
  • a first inner chamber A is roughly defined around the pump shaft between the back surface of the disc and the water seal.
  • the first inner chamber is roughly encapsulated in the circumferential direction by the annular flange 153 and/or the circumferential wall of the step hole 1116.
  • the radially outward area of the impeller chamber 1120 is roughly divided into three chambers: a second outer chamber B located on the back surface of the disc, wherein in the illustrated embodiment, the second outer chamber B is defined by the outer peripheral surface of the boss 1115 and the radially corresponding inner contour of the water pump housing and is substantially annular, and the second outer chamber B is radially outward with respect to the first inner chamber A; a blade chamber C located on the front surface of the disc, wherein the blade chamber is defined by the front surface of the disc or the blades provided thereon and the axially corresponding internal contour of the water pump housing; a peripheral chamber D defined between the periphery of the impeller and the radially corresponding inner contour of the water pump housing, wherein two axial ends of the peripheral chamber D are in fluid communication with the second outer chamber B and the blade chamber C, respectively.
  • the pump outlet 11b is provided on a top wall of
  • the disc 151 of the impeller 15 is provided with at least one balance hole 1511 in the form of an oblique hole.
  • the central axis of the balance hole 1511 is coplanar with the axis of the pump shaft and is inclined at a certain angle with respect to the axis of the pump shaft.
  • the inclination angle is approximately 26 degrees.
  • the radial distance of the point on the central axis of the balance hole 1511 from the axis of the pump shaft gradually decreases in the direction approaching the water seal.
  • the port of the balance hole 1511 close to the water seal leads into the first inner chamber A.
  • balance holes Although only two balance holes are shown in the figure, those skilled in the art can easily imagine that the number of balance holes can be changed according to actual needs. With the aid of the balance hole 1511, a pressure balance between the front and back of the impeller can be achieved.
  • the size of the balance hole cannot be designed too large; otherwise it will affect the efficiency of the water pump.
  • the inner diameter of the balance hole is, for example, 8 mm.
  • At least one flushing channel 1113 extending in the radial direction is provided in the boss 1115 in the seat portion 111 of the water pump housing 11, wherein the first port 1113a of the flushing channel 1113 passes through the wall of the water sealing hole 1112 into the water sealing hole, and the second port 1113b of the flushing channel 1113 opposite to the first port leads into a chamber in communication with the peripheral chamber D.
  • the second port 1113b leads into the second outer chamber B located near the radially outer circumferential surface of the boss.
  • the first port 1113a of the flushing channel 1113 leads to an area where the friction surface of the water seal 14 is located.
  • one of the plurality of flushing channels is located in the top area of the seat portion 111.
  • a venting channel 1114 is provided in the top area of the seat portion.
  • One port of the venting channel 1114 is provided in the wall of the flushing channel 1113 at the top of the seat portion, and another port of the venting channel 1114 is configured to lead to the top area of the first inner chamber A between the water seal 14 and the back of the impeller disc 151.
  • the gas entering the first inner chamber A rises to the top of the first inner chamber, then moves to the flushing channel 1113 by means of the venting channel, and then moves up to the second outer chamber B from the flushing channel.
  • the arrangements of the balance hole 1511 in the form of an oblique hole and the flushing channel 1113 are helpful for providing an improved fluid circulation on the surface of the water seal 14 and preventing bubbles and particles from accumulating on the surface of the water seal, thus avoiding high heat load and sealing loss caused by foreign matter such as bubbles and particles.
  • the venting channel With the help of the venting channel, the air is prevented from being trapped in the first inner chamber when the water pump is initially filled, thus avoiding the negative influence of air bubbles formed by air on the flow field distribution near the water seal.
  • the work flow is now described below taking the water pump for an engine cooling system as an example:
  • the water pump 1 when the water pump 1 is initially filled, the water flows in from the pump inlet 11a through the balance hole 1511, the annular gap between the annular flange and the step hole of the boss, and the flushing channel 1113 located in the lower half of the seat portion, and into the first inner chamber A.
  • the balance hole is in the form of an oblique hole, it promotes the flow of water on the surface of the water seal. As the filling process progresses, gas will slowly accumulate in the first inner chamber A, and then the bubbles left in the first inner chamber A will gather at the top of the chamber.
  • the bubbles flow via the venting channel 1114 into the flushing channel 1113 at the top of the seat portion, and then the bubbles are discharged from the pump outlet 11b, thus preventing the bubbles from being trapped in the first inner chamber A to affect the sealing performance of the water seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (6)

  1. Wasserpumpe (1) für ein Motorkühlsystem, umfassend: ein Wasserpumpengehäuse (11), das eine Wasserdichtungsbohrung (1112) definiert; eine Pumpenwelle (12), die in dem Wasserpumpengehäuse (11) drehbar gelagert ist; eine Wasserdichtung (14), die auf die Pumpenwelle (12) aufgesetzt und in der Wasserdichtungsbohrung (1112) positioniert ist; ein Pumpenrad (15), das auf die Pumpenwelle (12) und nahe der Wasserdichtung (14) aufgesetzt ist, das Pumpenrad (15) umfassend eine Scheibe (151), Schaufeln (152), die auf einer Seite der Scheibe (151) weg von der Wasserdichtung (14) eingerichtet sind, und mindestens eine Ausgleichsbohrung (1511), die beide Endseiten der Scheibe (151) durchdringt, wobei eine Mittelachse der Ausgleichsbohrung (1511) mit einer Mittelachse der Pumpenwelle (12) koplanar ist und in einem bestimmten Winkel hinsichtlich der Achse der Pumpenwelle (12) geneigt ist, und ein radialer Abstand eines Punkts auf der Mittelachse der Ausgleichsbohrung (1511) von der Achse der Pumpenwelle (12) allmählich abnimmt, während sich der Punkt der Wasserdichtung (14) nähert,
    wobei eine erste ringförmige Innenkammer (A) zwischen der Wasserdichtung (14) und einer Seite der Scheibe (151), die von den Schaufeln (152) abgewandt ist, um die Pumpenwelle (12) eingerichtet ist, und eine Öffnung der Ausgleichsbohrung (1511) nahe der Wasserdichtung (14) mit der ersten Innenkammer (A) verbunden ist,
    dadurch gekennzeichnet, dass
    mindestens ein Spülkanal (1113), der sich in die radiale Richtung erstreckt, in einem Sitzabschnitt (111) des Wasserpumpengehäuses (11), das die Wasserdichtungsbohrung (1112) definiert, bereitgestellt ist, wobei eine erste Öffnung (1113a) des Spülkanals durch eine Wand der Wasserdichtungsbohrung (1112) in die Wasserdichtungsbohrung (1112) hinein verläuft, eine zweite Öffnung (1113b) des Spülkanals mit einer zweiten Außenkammer (B) verbunden ist, die in Fluidaustausch mit einer umfänglichen Kammer (D), die zwischen dem Umfang des Pumpenrads (15) und dem Wasserpumpengehäuse (11) definiert ist, steht.
  2. Wasserpumpe (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Mittelachse der Ausgleichsbohrung in einem Winkel von etwa 26 Grad hinsichtlich der Achse der Pumpenwelle geneigt ist.
  3. Wasserpumpe (1) nach Anspruch 1, dadurch gekennzeichnet, dass die zweite Außenkammer (B) sich auf einer Seite der Scheibe, die von den Schaufeln (152) abgewandt ist, befindet und hinsichtlich der ersten Innenkammer (A) radial außen liegt.
  4. Wasserpumpe (1) nach Anspruch 1, dadurch gekennzeichnet, dass die erste Öffnung (1113a) des Spülkanals zu einem Bereich, in dem sich eine Reibungsoberfläche der Wasserdichtung befindet, führt.
  5. Wasserpumpe (1) nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass ein Entlüftungskanal (1114) in einem oberen Bereich des Sitzabschnitts (111) bereitgestellt ist, eine Öffnung des Entlüftungskanals (1114) in einer Wand des Spülkanals (1113), die sich an der Oberseite des Sitzabschnitts (111) befindet, bereitgestellt ist und eine andere Öffnung des Entlüftungskanals (1114) konfiguriert ist, um zu einem oberen Bereich der ersten Innenkammer (A), die zwischen der Wasserdichtung (14) und der Scheibe (151) des Pumpenrads angeordnet ist, zu führen.
  6. Wasserpumpe (1) nach Anspruch 5, dadurch gekennzeichnet, dass sich der Entlüftungskanal (1114) im Wesentlichen parallel zu der Achse der Pumpenwelle (12) erstreckt oder nach oben geneigt ist, während er sich von der ersten Innenkammer (A) wegerstreckt.
EP21721830.4A 2020-04-30 2021-04-16 Wasserpumpe für motorkühlsystem Active EP4143442B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202020705805.7U CN211950652U (zh) 2020-04-30 2020-04-30 用于发动机冷却系统的水泵
PCT/EP2021/025141 WO2021219245A1 (en) 2020-04-30 2021-04-16 Water pump for engine cooling system

Publications (2)

Publication Number Publication Date
EP4143442A1 EP4143442A1 (de) 2023-03-08
EP4143442B1 true EP4143442B1 (de) 2025-09-17

Family

ID=73163196

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21721830.4A Active EP4143442B1 (de) 2020-04-30 2021-04-16 Wasserpumpe für motorkühlsystem

Country Status (3)

Country Link
EP (1) EP4143442B1 (de)
CN (1) CN211950652U (de)
WO (1) WO2021219245A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE517824C (de) * 1929-11-28 1931-02-07 Maffei Schwartzkopff Werke G M Kreiselpumpe mit Wellenabdichtung durch Hilfsfluegelrad und Ventil
FR2281045A7 (fr) * 1974-07-30 1976-02-27 Bosch Siemens Hausgeraete Pompe centrifuge equipee d'un moteur d'entrainement
FI20050450L (fi) * 2005-04-29 2006-10-30 Sulzer Pumpen Ag Keskipakopumppu ja sen juoksupyörä
WO2019043730A1 (en) * 2017-08-31 2019-03-07 Cri Pumps Private Limited IMPELLER

Also Published As

Publication number Publication date
WO2021219245A1 (en) 2021-11-04
EP4143442A1 (de) 2023-03-08
CN211950652U (zh) 2020-11-17

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