JP2019113034A - Water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump capable of suppressing the outflow of cooling water to the outside. SOLUTION: A housing 2 having a bearing 5, a shaft 6 rotatably supported by the bearing 5, an impeller 8 which rotates integrally with the shaft 6 and pumps cooling water, and between the impeller 8 and the bearing 5. The mechanical seal 9 provided to suppress leakage of the cooling water on the impeller 8 side to the bearing 5 side, the discharge hole 12 for discharging the cooling water leaking to the bearing 5 side beyond the mechanical seal 9, and the housing 2 A reservoir 13 having an opening 21 and communicating with the discharge hole 12 and a plug 14 having a cylindrical portion 32 arranged in the opening 21 and communicating with the outside are provided, and the discharge hole 12 is a mechanical seal 9. The cylindrical portion 32 has a first opening 35 that opens to the reservoir 13 side, and has an inflow port 43 that allows the cooling water leaked from the bearing to flow downward and an outlet 44 that allows the cooling water to flow out to the reservoir 13. The first opening 35 is a water pump disposed above the height of the outlet 44. [Selection diagram] Fig. 2

Description

  The present invention relates to a water pump.

  Conventionally, as an example of a water pump, a housing, a rotary shaft supported by the housing through a bearing portion, an impeller supported by the rotary shaft and pumping a cooling fluid, and a portion between the impeller and the bearing portion A sealed member (mechanical seal), a discharge hole for guiding the fluid passing through the seal member from the impeller side downward, and a reservoir having an opening and capable of storing the fluid led to the discharge hole; There is known one provided with a plug disposed in an opening and making the inner periphery of the opening watertight (Patent Document 1).

  In such a water pump, the plug is formed with a tubular portion for discharging the fluid vaporized in the reservoir to the outside by communicating the reservoir with the outside.

JP 2008-121488 A

  However, in the water pump as described above, since the discharge hole is positioned above the cylindrical portion of the plug, when the fluid is led from the discharge hole to the reservoir, the outside of the housing is formed via the cylindrical portion formed in the plug. There is a risk of leakage. In order to suppress such a leak, some measures are required.

  The present invention has been made in view of these circumstances, and an object thereof is to provide a water pump capable of suppressing the flow of fluid flowing into the reservoir out of the housing.

  A water pump that solves the above problems includes a housing having a bearing portion, a rotary shaft rotatably supported by the bearing portion, an impeller that rotates integrally with the rotary shaft and pumps fluid, and the impeller A seal member provided between the bearing portions for suppressing leakage of the fluid on the impeller side to the bearing portion side, and discharging the fluid that has passed the seal member and leaked to the bearing portion side to the lower side of the housing And a plug having an opening in the housing, a reservoir communicating with the discharge hole, and a plug disposed in the opening and communicating with the outside of the housing. The discharge hole has an inlet through which the fluid leaked from the seal member flows to the discharge hole, and an outlet through which the fluid flowing from the inlet flows out to the reservoir, and the cylindrical portion is on the reservoir side Open the reservoir side opening And, the reservoir-side opening, and configured to be disposed above the level of the outlet.

  According to the above configuration, when pumping the fluid by the impeller, the fluid that has leaked from the impeller side to the bearing side beyond the seal member is accumulated in the reservoir where the plug is fitted in the opening through the discharge hole. When the fluid is introduced from the discharge hole to the reservoir, the reservoir side opening of the cylindrical portion is disposed above the height of the outlet, so the fluid discharged to the reservoir through the tubular portion is a housing Can be suppressed from leaking outside. The fluid in the reservoir portion is discharged to the outside of the housing through the cylindrical portion by vaporization.

  In the above configuration, the housing preferably further includes a wall portion disposed between the reservoir side opening and the outlet.

  The fluid that has flowed out from the outlet may be directed toward the reservoir side opening by being splashed when it hits the reservoir. In this case, the repellent fluid may leak to the outside of the housing through the cylindrical portion. According to the above configuration, when the fluid splashed in the reservoir goes to the reservoir side opening, the splashed fluid contacts the wall portion disposed between the reservoir side opening and the outlet. Therefore, the wall portion can inhibit the repelled fluid from going to the reservoir side opening. As a result, it is possible to suppress that the fluid which has hit the reservoir portion and splashed leaks to the outside of the housing through the cylindrical portion.

  In the above configuration, it is preferable that the lower side of the cylindrical portion abuts on the wall portion.

  According to the above configuration, when the fluid splashed in the reservoir portion is directed to the reservoir portion side opening, the splashed fluid comes in contact with the wall portion or the tube portion having no gap at the lower side by contacting. Therefore, the wall portion and the cylinder portion can inhibit the repelled fluid from traveling toward the reservoir side opening. As a result, it is possible to suppress that the fluid which has hit the reservoir portion and splashed leaks to the outside of the housing through the cylindrical portion. The vaporized fluid passes through the upper side of the cylindrical portion and is discharged to the outside of the housing.

  In the configuration described above, it is preferable that the wall portion has a convex portion that protrudes toward the cylindrical portion, and the convex portion abuts below the cylindrical portion.

  According to the above configuration, when the fluid splashed in the reservoir portion is directed to the reservoir side opening, the splashed fluid comes in contact with the convex portion or the tube portion having no gap at the lower side by being in contact. Therefore, the convex portion and the cylindrical portion can inhibit the repelled fluid from traveling toward the reservoir side opening. As a result, it is possible to suppress that the fluid which has hit the reservoir portion and splashed leaks to the outside of the housing through the cylindrical portion. In addition, since the convex portion of the wall portion abuts on the lower side of the cylindrical portion, the vaporized fluid is discharged to the outside of the housing through the upper side of the reservoir side opening.

  In the above-mentioned composition, it is preferred that the above-mentioned cylinder part has a notch above the end by the side of a storage part, and the above-mentioned end abuts on a wall.

  According to the above configuration, when the fluid splashed in the reservoir portion is directed to the reservoir portion side opening, the splashed fluid comes in contact with the wall portion or the tube portion having no gap at the lower side by contacting. Therefore, the wall portion and the cylinder portion can inhibit the repelled fluid from traveling toward the reservoir side opening. As a result, it is possible to suppress that the fluid which has been splashed in the reservoir portion leaks to the outside of the housing through the cylindrical portion. In addition, since the cylindrical part does not contact | abut the wall part with the notch part formed above, the vaporized fluid can be discharged | emitted out of a housing through a notch part and a cylindrical part.

It is a sectional view showing the composition of the water pump concerning a 1st embodiment. It is a principal part enlarged view of the A section of FIG. It is the III-III sectional view of FIG. FIG. 5 is a partial cross-sectional view of a key portion of a second embodiment in a portion A of FIG. 1; FIG. 7 is a partial cross-sectional view of the essential portions of the third embodiment in the part A of FIG. 1; It is a principal part fragmentary sectional view of 4th Embodiment in the A section of FIG. It is VII-VII sectional drawing of FIG. It is a fragmentary sectional view of the important part of the modification in the A section of FIG.

First Embodiment
FIG. 1 is a cross-sectional view showing the configuration of the water pump 1 according to the present embodiment.

  As shown in FIG. 1, in the water pump 1, a housing 2 formed by casting or the like is fixed to, for example, a cylinder block 3 of an engine (not shown) by a fixing member (for example, a bolt not shown).

  The cylinder block 3 is formed with a suction port 15 for sucking cooling water (an example of a fluid) and a discharge port 16 for discharging the cooling water.

  The housing 2 is formed with a through hole 4 which exhibits a cylindrical space at a substantially central portion. Then, a bearing 5 (an example of a bearing portion) is disposed in the through hole 4. Furthermore, a shaft 6 (an example of a rotating shaft) is rotatably supported by the housing 2 via a bearing 5.

  In the following description, unless otherwise specified, the rotational axis direction of the shaft 6 is referred to as an axial direction, and the radial direction of the shaft 6 is simply referred to as a radial direction.

  Here, the bearing 5 is configured such that the axial length is shorter than the axial length of the through hole 4, and the bearing 5 is disposed at the end of the through hole 4 farthest from the cylinder block 3. The shaft 6 is rotatably supported by the housing 2 via the bearing 5.

  An impeller 8 having a plurality of blades in the circumferential direction is fixed to one end of the shaft 6 integrally rotatably by means such as press fitting. Further, at the other end of the shaft 6, a drive pulley 7 is fixed. An accessory drive belt (not shown) is hung on the drive pulley 7. The rotational driving force of the crankshaft (not shown) is transmitted to the shaft 6 via the accessory drive belt and the drive pulley 7. Thus, when the engine is driven, the impeller 8 rotates with the shaft 6 to pump the cooling water, and the cooling water is circulated to the engine cooling system (not shown).

  An annular mechanical seal 9 is disposed on the outer periphery of the shaft 6 in the region between the impeller 8 and the bearing 5. Specifically, the mechanical seal 9 is disposed in the through hole 4 with one end in the axial direction having a predetermined gap with the bearing 5, and the other end is from the through hole 4 to the cylinder block 3 side Stand out. Therefore, a space 10 is formed between the bearing 5 and the mechanical seal 9 in the through hole 4.

  In addition, there is a possibility that the cooling water on the impeller 8 side may leak through the slight gap between the inner peripheral surface of the mechanical seal 9 and the outer peripheral surface of the shaft 6 in the space 10 of the through hole 4 (broken line in FIG. 1). See arrow W1). In other words, the cooling water may pass through the mechanical seal 9 and leak into the space 10 of the through hole 4 on the bearing 5 side.

  Specifically, when the coolant in the liquid phase leaks from the mechanical seal 9, the coolant flows into the space 10 in the liquid phase. On the other hand, when cooling water (steam) in the vapor phase leaks from the mechanical seal 9, if steam is condensed in the space 10, the cooling water in the liquid phase is present in the space 10 (steam that was not condensed) Is discharged to the outside of the housing 2 as it is in the gas phase as will be described later).

  In the upper part of the housing 2, a steam discharge hole 11 is formed for letting the water vapor leaked from the mechanical seal 9 into the space 10 obliquely upward. Further, below the housing 2, a discharge hole 12 for discharging the cooling water flowing into the space 10 and the cooling water condensed in the space 10 (cooling water formed by condensation of water vapor) obliquely downward is formed. .

  In the housing 2, a reservoir 13 communicating with the discharge hole 12 is formed. Furthermore, the plug 14 is disposed in the reservoir 13.

  Next, the discharge hole 12, the reservoir 13, and the plug 14 will be described with reference to the drawings.

  FIG. 2 is a partial cross-sectional view of an essential part of part A of FIG.

  As shown in FIG. 2, the reservoir 13 is an elongated hole formed extending in the axial direction from the end surface on the drive pulley 7 side below the housing 2 to the impeller 8 side, and an opening exhibiting a substantially cylindrical space And a reservoir 22 communicating with the discharge hole 12 and storing the cooling water that has passed through the mechanical seal 9.

  As shown in FIG. 2, the plug 14 is disposed in the opening 21 of the reservoir 13 by press-fitting.

  The plug 14 has a closed portion 31 closing the opening 21 of the reservoir 13 and a cylindrical portion 32 (an example of a cylindrical portion) communicating with the outside of the housing 2.

  The closing portion 31 includes a circular disc portion 33 and a cylindrical flange portion 34 extending in the axial direction from the outer peripheral edge of the disc portion 33.

  The outer diameter of the disk portion 33 is substantially the same as the inner diameter of the opening 21 of the reservoir 13. Therefore, when the plug 14 is disposed in the opening 21, the entire outer peripheral surface of the flange 34 abuts on the entire inner peripheral surface of the opening 21 of the reservoir 13. Therefore, the inner circumference of the opening 21 is watertight due to the closed portion 31 of the plug 14.

  Further, a cylindrical portion 32 for communicating the reservoir portion 13 with the outside (atmosphere) of the housing 2 is formed in a substantially central portion of the disc portion 33.

  The cylindrical portion 32 is formed to extend in the axial direction from the disk portion 33 to the storage portion 13 side, and the first opening 35 (an example of the storage portion side opening) which is an opening on the storage portion 13 side It has the 2nd opening 36 which is a side opening, and the 1st end 37 in which the 1st opening 35 is formed.

  The storage portion 22 is formed extending in the axial direction from the opening 21 and exhibits a substantially cylindrical space.

  As shown in FIG. 2, in the storage portion 22 of the housing 2, a wall portion 41 opposed to the cylindrical portion 32 with a predetermined gap in the axial direction between the first opening 35 and the outflow port 44. It is formed.

  FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

  As shown in FIG. 3, the wall portion 41 has a substantially cylindrical shape, extends vertically downward from above the storage portion 22, and is formed below the height of the cylindrical portion 32. Therefore, the wall 41 overlaps the first opening 35 in the axial direction.

  As shown in FIG. 3, the storage portion 22 presents a substantially cylindrical space, and the substantially cylindrical wall portion 41 is formed from above the storage portion 22, so that the lower portion of the storage portion 22 is viewed from the axial direction Presents a substantially C-shaped space. Here, the lowermost part of the wall 41 is referred to as a bottom 42. The bottom portion 42 is formed below the height of the cylindrical portion 32.

  As shown in FIG. 1, the discharge hole 12 communicates the through hole 4 with the reservoir 22, and an inlet 43 opened to the inner periphery of the through hole 4, and an outlet 44 opened to the bottom 42 of the wall 41 And.

  As shown in FIG. 2, the outlet 44 is disposed below the height of the first opening 35 of the cylindrical portion 32 because the outlet 44 opens at the bottom 42 below the height of the cylindrical portion 32. In other words, the first opening 35 is disposed above the height of the outlet 44.

  Next, the operation of the water pump 1 will be described with reference to FIG.

  With the drive of the engine, the rotational drive force of the crankshaft is transmitted to the drive pulley 7 via the accessory drive belt hung on the drive pulley 7, and the shaft 6 rotates with the rotation of the drive pulley 7. As a result, the impeller 8 is integrally rotated with the shaft 6 and the cooling water is circulated through the engine cooling system by pumping the cooling water.

  When the water pump 1 is driven, there is a possibility that the cooling water on the impeller 8 side may leak over the mechanical seal 9 to the space 10 on the bearing 5 side. The cooling water leaked from the mechanical seal 9 in such a situation enters the space 10 and then is discharged downward by entering the inflow port 43 of the discharge hole 12. Thereafter, the cooling water flows from the outlet 44 to the reservoir 13 and is stored in the reservoir 22 of the reservoir 13 (see the arrow W1 shown by the broken line in FIG. 1 and the arrow W2 shown by the broken line). Therefore, even if the coolant from the mechanical seal 9 infiltrates, the situation where the coolant is simultaneously discharged to the outside of the housing 2 is avoided.

  Here, when the cooling water drips from the outlet 44 and strikes the storage portion 22, it may be splashed and directed to the first opening 35 (see an arrow W 2 shown by a broken line in FIG. 1).

  In the situation where the steam leaks from the mechanical seal 9 and the steam is not condensed in the space 10, the steam is discharged from the steam discharge hole 11 to the outside of the housing 2 (see the arrow V shown by the broken line in FIG. 1). ). On the other hand, when the water vapor is condensed in the space 10, the condensed water (cooling water) passes through the discharge hole 12 to the reservoir 13 in the same manner as the cooling water (liquid phase) leaked from the mechanical seal 9. It will flow in.

  In the situation where the cooling water flows into the reservoir 13, if the cooling water temporarily stored in the reservoir 13 is vaporized by the heat of the engine or the like and becomes steam, the steam passes through the cylindrical portion 32 of the plug 14 It will be discharged to the atmosphere.

  Therefore, if the amount of cooling water inflow to the reservoir 13 due to the cooling water leak from the mechanical seal 9 and the amount of cooling water (the amount of water vapor) discharged to the atmosphere through the cylindrical portion 32 are balanced, The water level in the portion 13 is maintained substantially constant, and the amount of cooling water present in the reservoir 13 does not exceed the capacity of the reservoir 13.

According to the embodiment, the following effects can be obtained.
(1) According to the above configuration, since the first opening 35 of the cylindrical portion 32 is disposed above the height of the outlet 44 of the discharge hole 12, the cooling water flowing into the storage 22 from the outlet 44 is Direct entry into the first opening 35 can be suppressed. Therefore, the fluid discharged to the reservoir 13 can be prevented from leaking to the outside of the housing 2 through the cylindrical portion 32.
(2) The cooling water that has flowed into the storage section 22 from the outlet 44 may splash when it contacts the storage section 22 and travel toward the first opening 35. According to the above configuration, the wall portion 41 is formed to face the first opening 35. Therefore, the repelled cooling water comes into contact with the wall portion 41 on the way to the first opening 35, and therefore, reaching the first opening 35 is suppressed. Therefore, the fluid discharged to the reservoir 13 can be prevented from leaking to the outside of the housing 2 through the cylindrical portion 32.
(3) According to the above configuration, since the plug 14 is substantially rotationally symmetrical when viewed in the axial direction, the plug 21 closes the opening 21 of the reservoir 13 no matter how it rotates about the axial direction. be able to.
Second Embodiment
Hereinafter, the second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the configuration of the plug 14 a and the opening 21 a of the reservoir 13. For this reason, about the member structure in common with 1st Embodiment, the same code | symbol shall be attached | subjected and description shall be abbreviate | omitted or simplified.

  FIG. 4 is a partial cross-sectional view of essential parts of the second embodiment.

  As shown in FIG. 4, the reservoir 13 is a lateral hole formed by extending axially from the end surface on the drive pulley 7 side below the housing 2 to the impeller 8 side, and an opening 21 a exhibiting a substantially cylindrical space And a reservoir 22 communicating with the outlet 44 of the discharge hole 12.

  A key groove 61 for regulating the vertical direction of the plug 14a is formed above the inner circumference of the opening 21a. The key groove 61 is formed to extend in the axial direction from the end of the opening 21 a on the outer side.

  A plug 14 a is disposed at the opening 21 a of the reservoir 13.

  The plug 14 a has a closed portion 31 closing the opening 21 a of the reservoir 13 and a cylindrical portion 32 a communicating with the outside of the housing 2.

  The closing portion 31 includes a circular disc portion 33 and a cylindrical flange portion 34 extending from the outer peripheral edge of the disc portion 33 along the axial direction.

  Above the flange portion 34, a key 62 that engages with the key groove 61 of the opening 21a is formed.

  The outer diameter of the disk portion 33 is substantially the same as the inner diameter of the opening 21 a of the reservoir 13. Therefore, when the plug 14 a is disposed in the opening 21 a, the entire outer peripheral surface of the flange 34 abuts on the entire inner peripheral surface of the opening 21 a of the reservoir 13. Therefore, the inner circumference of the opening 21a is sealed by the closing portion 31 of the plug 14a.

  Further, a cylindrical portion 32 a for communicating the reservoir portion 13 with the outside (atmosphere) of the housing 2 is formed in a substantially central portion of the disc portion 33.

  The cylindrical portion 32a is formed to extend in the axial direction from the storage portion 13 side of the disc portion 33, and the first opening 35a (an example of the storage portion side opening) which is an opening on the storage portion 13 side It has the 2nd opening 36 which is a side opening, the 1st end 37 in which the 1st opening 35a is formed, and the notch 63 above the 1st end 37. As shown in FIG.

  The cylindrical portion 32a is formed such that its axial length is in contact with the wall portion 41 when the opening 21a is closed by the plug 14a.

  The notch 63 is formed by cutting off the upper corner of the first end 37.

  Therefore, the first opening 35a has a third opening 64 whose edge is the lower side of the first end 37, and a fourth opening 65 whose edge is the notch 63.

  The plug 14a is inserted into the opening 21a such that the key 62 engages with the key groove 61 of the opening 21a. The first end 37 of the cylindrical portion 32 a abuts on the wall 41.

  In addition, the operation of the water pump 1 is the same as that of the first embodiment. Therefore, when the cooling water drips from the outflow port 44 and hits the storage portion 22, it may be splashed and directed to the first opening 35 (see the arrow W 2 shown by a broken line in FIG. 4).

According to the embodiment, in addition to the same effects as the effects (1) and (2) of the first embodiment, the following effects can be obtained.
(4) According to the above configuration, the third opening 64 is closed by the wall 41 because the lower side of the first end 37 of the cylindrical portion 32 a contacts the wall 41. Therefore, the splashed cooling water comes in contact with the wall portion 41 on the way to the first opening 35a. As a result, discharge of cooling water to the outside of the housing 2 through the cylindrical portion 32a can be suppressed.
(5) According to the above configuration, since the notch 63 is formed above the first end 37, the fourth opening 65 of the cylindrical portion 32a does not close the cylindrical portion 32. Therefore, the cooling water (water vapor) vaporized in the storage portion 22 is discharged from the second opening 36 to the outside of the housing 2 through the fourth opening 65 of the cylindrical portion 32 a.
Third Embodiment
The third embodiment will be described below with reference to FIG. The third embodiment is different from the first embodiment in the configuration of the wall 41 a. For this reason, about the member structure in common with 1st Embodiment, the same code | symbol shall be attached | subjected and description shall be abbreviate | omitted or simplified.

  FIG. 5 is a partial cross-sectional view of essential parts of the third embodiment.

  As shown in FIG. 5, a wall portion 41 a is formed in the storage portion 22 so as to face the cylindrical portion 32 with a predetermined gap in the axial direction between the first opening 35 and the outflow port 44. Be done.

  As in the first embodiment, the wall portion 41 a has a substantially cylindrical shape, extends vertically downward from above the storage portion 22, and is formed below the height of the cylindrical portion 32. Therefore, the wall 41 a overlaps the first opening 35 in the axial direction.

  As shown in FIG. 5, below the wall portion 41a, a first convex portion 71 (an example of the convex portion) is formed which protrudes in substantially the same length as the predetermined gap between the cylindrical portion 32 and the wall portion 41a in the axial direction. Be done. The first convex portion 71 is formed so as to axially overlap the lower side of the cylindrical portion 32.

  Therefore, the first convex portion 71 contacts the lower side of the first end portion 37 when the plug 14 is disposed in the opening 21. In other words, the first convex portion 71 does not abut on the upper side of the first end portion 37.

  The discharge hole 12 communicates the through hole 4 with the reservoir 22 and has an inlet 43 communicating with the through hole 4 and an outlet 44 communicating with the bottom 42 of the wall 41 a of the reservoir 22.

  As shown in FIG. 5, since the outlet 44 communicates with the bottom 42 below the height of the cylindrical portion 32, the outlet 44 is disposed below the height of the first opening 35 of the cylindrical portion 32. In other words, the first opening 35 is disposed above the height of the outlet 44.

  In addition, the operation of the water pump 1 is the same as that of the first embodiment. Therefore, when the cooling water drips from the outflow port 44 and hits the storage portion 22, it may be splashed to go to the first opening 35 (see the arrow W2 shown by a broken line in FIG. 5).

According to the above-described embodiment, in addition to the same effects as the effects (1), (2), and (3) of the first embodiment, the following effects can be obtained.
(6) According to the above configuration, since the first convex portion 71 abuts on the lower side of the first end portion 37, the splashed cooling water contacts the wall portion 41 a on the way to the first opening portion 35. Therefore, discharge of the cooling water to the outside of the housing 2 through the cylindrical portion 32 can be suppressed.
(7) According to the above configuration, since the first convex portion 71 does not abut on the upper portion of the first end portion 37, the cooling water (water vapor) vaporized in the storage portion 22 flows from above the cylindrical portion 32 of the housing 2. It is discharged to the outside.
Fourth Embodiment
The fourth embodiment will be described below with reference to FIGS. 6 and 7. The fourth embodiment is different from the first embodiment in the configuration of the wall portion 41 b. For this reason, about the member structure in common with 1st Embodiment, the same code | symbol shall be attached | subjected and description shall be abbreviate | omitted or simplified.

  FIG. 6 is a partial cross-sectional view of essential parts of the fourth embodiment.

  As shown in FIG. 6, a wall portion 41 b is formed in the storage portion 22 so as to face the cylindrical portion 32 with a predetermined gap in the axial direction between the first opening 35 and the outflow port 44. Be done.

  As in the first embodiment, the wall portion 41 b has a substantially cylindrical shape, extends vertically downward from above the storage portion 22, and is formed below the height of the cylindrical portion 32. Therefore, the wall 41 b axially overlaps the first opening 35.

  As shown in FIG. 6, below the wall portion 41b, a second convex portion 81 is formed whose axial length protrudes longer than a predetermined gap between the end portion of the cylindrical portion 32 and the wall portion 41b.

  7 is a cross-sectional view taken along the line VII-VII in FIG.

  As shown in FIG. 7, the second convex portion 81 protrudes from the wall portion 41 b along the outer periphery below the cylindrical portion 32. Therefore, the second convex portion 81 overlaps the first end 37 in the radial direction.

  Therefore, the second convex portion 81 covers the lower side of the end portion of the cylindrical portion 32 when the plug 14 is disposed in the opening 21.

  As in the first embodiment, the discharge hole 12 communicates the through hole 4 with the reservoir 22, and the inlet 43 communicating with the through hole 4 and the outlet communicating with the bottom 42 of the wall 41 b of the reservoir 22. And 44.

  Since the outlet 44 communicates with the bottom 42 below the height of the cylindrical portion 32, the outlet 44 is disposed lower than the height of the first opening 35 of the cylindrical portion 32. In other words, the first opening 35 is disposed above the height of the outlet 44.

  In addition, the operation of the water pump 1 is the same as that of the first embodiment. Therefore, when the cooling water drips from the outflow port 44 and hits the storage portion 22, it may be splashed and directed to the first opening 35 (see an arrow W 2 shown by a broken line in FIG. 6).

According to the above-described embodiment, in addition to the same effects as the effects (1), (2), and (3) of the first embodiment, the following effects can be obtained.
(8) According to the above configuration, since the second convex portion 81 covers the lower side of the cylindrical portion 32, the splashed cooling water contacts the wall portion 41 b on the way to the first opening 35. Therefore, discharge of the cooling water to the outside of the housing 2 through the cylindrical portion 32 can be suppressed.
(Modification)
In all the embodiments, the cylindrical portion is formed as the cylindrical portion 32. However, the shape when the cylindrical portion is viewed from the axial direction may be a polygon such as a triangle or a quadrangle, or a shape such as an oval.

  FIG. 8 is a partial cross-sectional view of essential parts in the A part of FIG. In the first embodiment, the cylindrical portion 32 is used, but as shown in FIG. 8, the cylindrical portion 32 may be used as the hole 91. At this time, the hole 91 faces the wall 41 b with a predetermined gap, and is disposed above the height of the outlet 44.

1 Water pump 2 Housing 4 Through hole 5 Bearing (bearing)
6 shaft (rotational axis)
8 Impeller 9 Mechanical seal (seal member)
12 Discharge hole 13 Reservoir 14 Plug 21 Opening 22 Reservoir 32 Cylindrical part 35 First opening (reservoir side opening)
36 second opening 37 first end 41 wall 42 bottom 43 inlet 44 outlet 61 key groove 62 key 63 notch 64 third opening 65 fourth opening 71 first convex (an example of convex) )
81 second convex portion 91 hole

Claims (5)

A housing having a bearing portion;
A rotating shaft rotatably supported by the bearing portion;
An impeller that rotates integrally with the rotating shaft and pumps the fluid;
A seal member provided between the impeller and the bearing portion for suppressing leakage of the fluid on the impeller side to the bearing portion side;
A discharge hole which discharges the fluid which has passed through the seal member and leaked to the bearing side to the lower side of the housing;
A reservoir having an opening in the housing and communicating with the discharge hole;
A plug disposed in the opening and having a cylindrical portion communicating with the outside of the housing;
The discharge hole has an inlet through which the fluid leaked from the seal member flows to the discharge hole, and an outlet through which the fluid flowing from the inlet flows out to a reservoir.
The cylindrical portion has a reservoir side opening that opens to the reservoir side,
The reservoir side opening is disposed above the height of the outlet. Water pump. The water pump according to claim 1, wherein the housing further has a wall portion disposed between the reservoir side opening and the outlet. The water pump according to claim 1, wherein the lower portion of the tubular portion abuts on the wall portion. The wall portion has a convex portion protruding toward the cylinder portion,
The water pump according to any one of claims 1 to 3, wherein the convex portion is in contact with the lower side of the cylindrical portion. The water pump according to any one of claims 1 to 3, wherein the cylindrical portion has a notch above the end on the reservoir side, and the end abuts on the wall.

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