JP2006144735A - Water pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve pump efficiency by generating turbulence of cooling water near a rotary center which is before an edge part of a blade part slides with a taper surface part and in which energy loss is small eliminating turbulence in cooling water when cooling water flows in a swirl chamber to minimize energy loss due to collision in a water pump. <P>SOLUTION: The taper surface part keeping communication between a suction port and the swirl chamber is provided in a second water pump case storing an impeller therein. The impeller is provided with a boss part in which a pump shaft is inserted and the blade part radially expanding in a radial direction of a pump shaft from the boss part and extending in an suction port side in a longitudinal direction of the pump shaft. The edge part is provided on the blade part. Suction port side of the edge part is continuously formed to connect a blade top part provided with facing a suction port side end part of the taper surface part and a pump shaft side tip part. The suction port side end part is formed with projecting to the suction port side of the pump shaft side tip part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water pump, and more particularly to a water pump that improves pump efficiency by making impeller blades have a unique shape.

  In a vehicle engine, there is a water-cooled engine in which cooling water is forcibly circulated by a water pump in order to maintain each part at an appropriate temperature.

  As shown in FIG. 8, a water pump 102 attached to a water-cooled engine (not shown) includes a first water pump case 104-1 that supports a bearing 108 that supports a pump shaft 106 as a water pump case 104. , A second water pump case 104-2 for housing the impeller 110 mounted on the pump shaft 106, and a mating surface 104-1F of the first water pump case 104-1 and the second water pump case 104-2. There is a type in which a vortex chamber 114 is formed in a mating surface portion 112 between the surface 104-2F and cooling water is pumped from the suction port 116 of the second water pump case 104-2 to the vortex chamber 114 by rotation of the impeller 110. .

  In this water pump 102, as shown in FIGS. 9 and 10, the blade portion 118 of the impeller 110 rises from the inner diameter portion 122 serving as the inlet portion of the closed chamber 120 and continues to the outlet portion 124 of the closed chamber 120. The cooling water flowing in from the suction port 116 is sucked into the closed chamber 120 while colliding with the tip of the blade part (e.g., eight blades) 118 and being turbulent. Mechanical energy is provided by the rotation of the portion 118 and flows from the vortex chamber 114 to a discharge port (not shown). As shown in FIG. 9, the impeller 110 is formed with a closed portion D at a portion of the closed chamber 120 (shown by a hatched portion in FIG. 7).

Conventionally, a water pump is centered on an insert member having a shaft mounting hole, and on the outside of the insert member, a boss portion covering the outer periphery of the insert member, a disk portion spreading in a disk shape from the boss portion, And a blade portion projecting at a substantially constant interval on the disk portion, the boss portion, the disk portion and the blade portion are integrally formed of resin, and the insert member is formed into a cylindrical body, and the central portion in the width direction of the outer periphery of the cylindrical body Are provided with polygonal protrusions.
JP 9-217699 A

  Incidentally, in the conventional water pump 104 shown in FIG. 8, the shape of the blade portion 118 of the impeller 110 rises from the inner diameter portion 122 of the closed chamber 120 as shown in FIGS. 9 and 10. It is a shape that is continuously connected to the outlet portion 124, and the blade portion 118 is not formed on the inner side from the inner diameter portion 122 of the closed chamber 120, and a recess 126 is formed. .

  For this reason, since the portion where the fluid collides with the blade portion 118 is immediately before the closed chamber 120, the turbulence generated when the fluid collides with the blade portion 118 due to the fluid collision strongly affects the discharge flow rate. In order to solve this problem, when changing the number of blades and the blade angle, the pump efficiency is lowered, and the point of collision with the fluid blade 118 is closed. Since the radius of the pump shaft 104 immediately before the chamber 120 is a large portion, there is a disadvantage that energy loss due to collision is large and pump efficiency is reduced. Moreover, in order to reduce the disturbance of the collision, special processing such as making the tip shape of the blade portion 118 into a tapered shape is required, and there is a disadvantage that the cost increases.

  That is, in the closed chamber 120 to which rotational energy is applied, the influence of the fluid turbulence due to the impact at the tip of the blade 118 is strong, and the factors that decrease the pump efficiency such as a decrease in the discharge flow rate and an increase in friction. It was. Further, since the radius of the pump shaft 106 at the point where the cooling water collides with the blade portion 118 is large, the energy loss is large, which causes a reduction in pump efficiency.

  The present invention includes a first water pump case that supports a bearing that supports a pump shaft of a water pump, and a second water pump case that houses an impeller mounted on the pump shaft, and the first water pump case. And a second water pump case, a vortex chamber is formed on the mating surface portion of the second water pump case, and a water pump that pumps cooling water from the suction port of the second water pump case to the vortex chamber by the rotation of the impeller. The water pump case is provided with a tapered surface portion that communicates between the suction port and the vortex chamber. The impeller includes a boss portion that is inserted into the pump shaft, and a radial direction of the pump shaft from the boss portion. A blade portion extending radially and extending toward the suction port in the longitudinal direction of the pump shaft, an edge portion is provided on the blade portion, and a front portion of the edge portion is provided. The suction port side is continuously formed so as to connect the blade top portion provided on the suction port side end portion of the tapered surface portion and the pump shaft side tip portion, and the suction port side end portion is provided on the pump. It is characterized by being formed so as to protrude toward the suction port side with respect to the shaft side tip portion.

  The water pump of the present invention is provided with an edge portion on the impeller blade portion disposed opposite to the suction port, and the suction port side of the edge portion is provided facing the suction port side end of the tapered surface portion. The suction port is formed by continuously forming the blade top and the pump shaft side tip so that the suction port side end projects from the pump shaft side tip toward the suction port. First, the cooling water pumped from the impingement is made to collide with the tip of the pump shaft, which is the rotation center of the blade, and the edge of the blade is just before the edge of the blade slides with the taper surface portion, and the rotation center with little energy loss. By creating a turbulent cooling water in the vicinity, when the cooling water flows into the vortex chamber, the cooling water can be kept free of turbulence, minimizing energy loss in collision and improving pump efficiency. Can be made.

Realizing the purpose of improving pump efficiency by continuously forming the blade edge of the impeller disposed opposite the suction port so as to connect the blade top and the pump shaft tip. It is.
Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

  1 to 3 show a first embodiment of the present invention.

  In FIG. 1, a water pump 2 is attached to a water-cooled engine (not shown) and forcibly circulates cooling water through the engine to cool it.

  The water pump 2 includes a first water pump case 4-1 and a second water pump case 4-2 as the water pump case 4.

  The first water pump case 4-1 includes a shaft support portion 8 in which a pump shaft hole 6 is formed, and a first case wall portion 10 continuous with the shaft support portion 8. A bearing 14 that supports the pump shaft 12 is supported and provided in the pump shaft hole 6. The outer diameter of the bearing 14 is formed larger than the outer diameter of the pump shaft 12.

  The second water pump case 4-2 includes a suction port wall portion 20 that forms a suction port 18 for sucking cooling water from the cooling water outlet portion 16 on the engine side, and a pump chamber 22 that is continuous with the suction port wall portion 20. And a second case wall portion 26 continuous with the pump chamber wall portion 24. The cooling water outlet 16 on the engine side is provided concentrically with the inlet 18 and opposed to the inlet 18.

  The mating surface 28 between the mating surface 4-1F of the first case wall 10 of the first water pump case 4-1 and the mating surface 4-2F of the second case wall 26 of the second water pump case 4-2. A vortex chamber 30 is formed. The vortex chamber 30 is formed of a first vortex chamber 30-1 on the first water pump case 4-1 side and a second vortex chamber 30-2 on the second water pump case 4-2 side. The vortex chamber 30 communicates with a discharge port (not shown) for discharging the cooling water to each side of the engine.

  The second water pump case 4-2 accommodates a spiral impeller 32 attached to one end of the pump shaft 12 disposed concentrically with the suction port 18. A pump pulley 34 is attached to the other end side of the pump shaft 12 to wrap a drive belt (not shown) outside the first water pump case 4-1.

  Further, a seal member (mechanical seal) 38 is attached to the pump shaft 12 in a space portion 36 between the bearing 14 and the impeller 32. The space portion 36 is formed of a first space portion 36-1 formed around the pump shaft hole 6 and a second space portion 36-2 formed in the impeller 32. The seal member 38 seals the bearing 14 from the pump chamber 22 and the vortex chamber 30.

  In addition, the second water pump case 4-2 is provided with a tapered surface portion 40 that communicates between the suction port 18 and the vortex chamber 30. The tapered surface portion 40 is directed from the suction port 18 side to the vortex chamber 30 side, and is formed to expand at a predetermined angle θ with respect to the axial direction of the pump shaft 12.

  As shown in FIG. 2, the impeller 32 has a boss portion 44 in which a shaft hole portion 42 to be inserted into the pump shaft 12 is formed, and extends continuously in the radial direction of the pump shaft 12 and has an outer edge. A ring-shaped substrate portion 46 that is slightly curved so as to extend away from the suction port 18 side as it extends toward the portion 32E side, and the surface of the substrate portion 46 on the suction port 18 side and the outer peripheral surface of the boss portion 44 are erected. There are provided blade portions (for example, six blades) 48 that extend radially in the radial direction of the pump shaft 12 and spirally in a curve R and extend toward the suction port 18 in the longitudinal direction of the pump shaft 12. Yes. Between the blade portion 48 of the impeller 32 and the tapered surface portion 40 of the second water pump case 4-2, a closed chamber 50 that connects the suction port 18 and the vortex chamber 30 is formed with a gap W. . Further, the end surface 44 </ b> F on the suction port 18 side of the boss portion 44 is located in the same plane as the end surface 12 </ b> F of the pump shaft 12.

  The blade portion 48 is provided with an edge portion 52. As shown in FIGS. 2 and 3, the suction port 18 side of the edge portion 52 is the suction port side end portion 54 (inlet portion of the closed chamber 50) which is the inner diameter portion of the tapered surface portion 40 in the first embodiment. A first edge 52A having a continuously smooth curve so as to connect the blade top 56 provided facing the surface and the pump shaft-side tip 58 on the pump shaft 12 side, and the first edge 52A. A linear second edge 52B passing through the suction port side end portion 54 and along the tapered surface portion 40 to the blade outer diameter (exit portion of the closed chamber 50), and the second edge portion 52B. It is formed by a third edge portion 52C which is directed in the axial direction of the pump shaft 12 and is continuous with the outer edge portion 32E. The end surface 58F of the pump shaft side front end portion 58 is located in the same plane as the end surface 44F of the boss portion 44 on the suction port 18 side. Further, the blade top portion 56 of the blade portion 48 is formed to protrude from the pump shaft side tip portion 58 by a distance L in the axial direction of the pump shaft 12 toward the suction port 18. That is, at the edge portion 52 of the blade portion 48, the forming point is the top of the boss portion 44 of the pump shaft 12, and the forming point is the starting point through the inner diameter of the closed chamber 50. Molded in a continuous and smooth curve to the outer diameter.

  Further, in the impeller 32, as shown in FIG. 2, a closed portion D is formed at a portion of the closed chamber 50 (shown by a hatched portion in FIG. 2).

  Thereby, the water pump 2 causes the cooling water sucked into the pump chamber 22 from the suction port 18 of the second water pump case 4-2 by the centrifugal force generated by the rotation of the impeller 32 from the vortex chamber 30 to the discharge port (not shown). )) And pump it to each part of the engine.

  Further, as shown in FIG. 2, balance holes 60-1 and 60-2 are formed in the impeller 32 approximately symmetrically with the boss portion 44 as the center.

  Next, the operation of the first embodiment will be described.

  In the water pump 2, when the pump pulley 34 is rotated, the impeller 32 is rotated with the rotation of the pump shaft 12, and the cooling water is sucked from the suction port 18 and the closed chamber 38. From 30, it is fed to each part of the engine through the discharge port.

  And in this 1st Example, the edge part 52 of the blade | wing part 48 is a suction port which is an inner diameter part of the closed chamber 50 by a continuous and smooth curve from the pump shaft side innermost diameter part of the blade innermost diameter part end surface top part. The cooling water flowing from the suction port 18 passes through the side end portion 54 and is molded to the outer diameter of the blade, so that the cooling water flowing from the suction port 18 is the innermost portion inside the inner diameter of the closed chamber 50, that is, the center of the blade portion 48. As a result, the cooling water is disturbed at the center of the blade 48 so that energy loss in the cooling water collision is minimized. It is possible to minimize the influence of the cooling water that does not generate the vortex generated during the collision into the closed chamber 50. That is, in the blade portion 48, the forming point is the top of the boss portion 44, and the forming point is the starting point and passes through the inner diameter of the closed chamber 50 to the outer diameter of the closed chamber 50. Since it is molded in a curve, the pump discharge performance can be optimized, the friction can be reduced, the pump efficiency can be improved, and special processing is not required and the cost can be reduced.

  That is, the second water pump case 4-2 is provided with a tapered surface portion 40 that communicates between the suction port 18 and the vortex chamber 30, and the impeller 32 has a boss portion 44 inserted into the pump shaft 12 and the boss portion. A blade portion 48 extending radially from the portion 44 in the radial direction of the pump shaft 12 and extending to the suction port 18 side in the longitudinal direction of the pump shaft 12 is provided, and an edge portion 52 is provided on the blade portion 48. The suction port 18 side of the edge portion 52 is continuously formed so as to connect the blade top portion 56 provided facing the suction port side end portion 54 of the tapered surface portion 40 and the pump shaft side tip portion 58, and suction is performed. Since the mouth end 54 is formed so as to protrude from the pump shaft tip 58 toward the suction port 18 side, the cooling water pumped from the suction port 18 is first pump shaft that is the rotation center of the blade 48. The edge of the blade 48 is made to collide with the tip of 12 When the cooling water flows into the vortex chamber 30 by causing the cooling water to be turbulent in the vicinity of the rotation center where 52 is in contact with the tapered surface portion 40 and has little energy loss, the turbulent cooling water is disturbed. The energy efficiency in the collision can be minimized and the pump efficiency can be improved.

  In addition, since the engine-side cooling water outlet 16 is provided opposite to the suction port 18, the flow direction of the cooling water pumped from the engine-side cooling water outlet 16 and the flow direction of the suction port 18 are The cooling water pumped from the suction port 18 can collide with the rotation center of the impeller 32 efficiently, and the pump efficiency can be further improved.

  4 and 5 show a second embodiment of the present invention.

  In the following embodiments, portions having the same functions as those of the first embodiment will be described with the same reference numerals.

  The features of the second embodiment are as follows. That is, each pump shaft side tip portion 58 of each blade portion 48 is formed integrally with the top portion 12A, which is the end surface of the pump shaft 12, and is curved so as to protrude toward the suction port 18 side. The first edge portion 50-1 of the edge portion 52 of the blade portion 48 is linearly formed in the radial direction orthogonal to the axial direction of the pump shaft 12.

  According to the configuration of the second embodiment, the pump shaft side front end portion 58 is formed on the top portion 12 </ b> A that is the end surface of the pump shaft 12, so that the cooling water flowing out from the suction port 18 can be removed at the center of the pump shaft 12. Since it can be made to collide with the front-end | tip part 58 of the pump shaft side of 12 A of top parts, the energy loss in a collision can be minimized further, and pump efficiency can be improved.

  FIG. 6 shows a special configuration of the present invention and shows a third embodiment.

  The features of the third embodiment are as follows. In other words, the boss portion 44 of the impeller 32 has a cylindrical rectifier functioning as a rectifying plate so as to form an rectifying space 72 that is axially oriented on the suction port 18 side and cooperates with the end surface of the pump shaft 12. The member 74 was extended. The rectifying member 74 is formed with a plurality of rectifying outlets 76 that are inclined so that the cooling water in the rectifying space 72 flows out along the surface of the substrate portion 46. The rectifying member 74 rectifies the disturbance of the cooling water in the rectifying space 72 and causes the cooling water to flow out to the surface side of the substrate portion 46.

  According to the configuration of the third embodiment, the cooling water from the suction port 18 side flows into the rectifying space 72 to suppress turbulence, and is rectified from the rectifying outlet 76 along the surface of the substrate portion 46. Therefore, the influence of the turbulence on the vortex chamber 30 can be suppressed and the pump efficiency can be improved.

  FIG. 7 shows a special configuration of the present invention and shows a fourth embodiment.

  The features of the fourth embodiment are as follows. That is, the second water pump case 4-2 is provided with a plurality of cooling water guide bodies 82 for guiding the cooling water to the pump shaft 12 side which is the axial center on the inner surface of the suction inlet wall portion 20.

  According to the configuration of the fourth embodiment, the cooling water from the engine side is guided to the axial center side on the pump shaft 12 side by the cooling water guide body 82, so that the disturbance of the cooling water affects the vortex chamber 30. Can be suppressed, and the pump efficiency can be improved.

  It is not limited to the water pump, but the centrifugal type that the edge of the blade portion of the impeller disposed opposite to the suction port is continuously formed so as to connect the top portion of the blade portion and the tip portion of the pump shaft. It can be applied in general with a pump or the like.

It is sectional drawing of a water pump in 1st Example. It is a front view of an impeller in the 1st example. It is sectional drawing of the impeller by the III-III line of FIG. It is a front view of an impeller in the 2nd example. It is sectional drawing of the impeller by the VV line of FIG. It is sectional drawing of an impeller in 3rd Example. In 4th Example, it is a partial cross section figure of a water pump. It is sectional drawing of the water pump conventionally. It is a front view of an impeller in the past. It is sectional drawing of the impeller by the XX line of FIG.

Explanation of symbols

2 Water Pump 4 Water Pump Case 12 Pump Shaft 14 Bearing 16 Cooling Water Outlet 18 Suction Port 22 Pump Chamber 28 Matching Surface 30 Vortex Chamber 32 Impeller 40 Taper Surface 44 44 Boss 48 Blades 50 Closed Chamber 52 Edge 54 Suction Port Side end 56 Blade top 58 Pump shaft side tip

Claims (3)

  A first water pump case that supports a bearing that supports a pump shaft of the water pump; and a second water pump case that houses an impeller mounted on the pump shaft, the first water pump case and the second water pump case. In the water pump in which a vortex chamber is formed in a mating surface portion with the water pump case, and cooling water is pumped from the suction port of the second water pump case to the vortex chamber by the rotation of the impeller, the second water pump case Has a tapered surface portion that communicates between the suction port and the vortex chamber, and the impeller has a boss portion that is inserted into the pump shaft, and extends radially from the boss portion in the radial direction of the pump shaft. And a blade portion extending toward the suction port side in the longitudinal direction of the pump shaft, an edge portion is provided on the blade portion, and the suction port side of the edge portion is The taper surface portion is continuously formed so as to connect the blade top portion provided facing the suction port side end portion and the pump shaft side tip portion, and the suction port side end portion is provided as the pump shaft side tip portion. Further, the water pump is formed so as to protrude toward the suction port side.   The water pump according to claim 1, wherein the pump shaft side tip is formed at a top of the pump shaft.   The water pump according to claim 1, wherein the cooling water outlet portion on the engine side is provided to face the suction port.

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