JPH0130639Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a water pump that forcibly pumps cooling water to a cooled part of an internal combustion engine or the like of a vehicle.

BACKGROUND TECHNOLOGY In conventional water pumps of this type, moisture is prevented from entering the bearing portion that rotatably supports the drive shaft within the pump housing from the pump chamber formed within the pump housing. Therefore, while a mechanical seal is installed on the drive shaft, a drain is installed in the pump housing to drain the water leaking from between the sliding part of the mechanical seal and the pump housing to the outside of the pump housing. It forms a hole.

Problems to be Solved by the Invention However, if the amount of water leaking from between the sliding part provided in the mechanical seal and the pump housing to the bearing part side is small, the water leaks through the drain hole provided in the pump housing. Although leakage water can be sufficiently drained, if a foreign object intervenes between the sliding part and the pump housing and a large amount of water temporarily enters from the pump chamber side, the drain hole It was not possible to drain the water sufficiently, and some of the leaked water sometimes entered the bearing.
In addition, in conventional water pumps, if water leaks from between the sliding part provided in the mechanical seal and the pump housing to the bearing part, some of the leaked water is not drained from the drain hole, and the bearing The water may remain in the annular space between the bearing part and the mechanical seal for a long period of time, and the leakage water often damages the bearing part.

Means for Solving the Problems In order to solve these conventional problems, this invention provides at least two seals at a predetermined interval in the axial direction on the mechanical seal side between the bearing part and the drive shaft.
The space formed by the adjacent seal members is filled with grease, and the pump housing and the bearing are provided with drainage water that communicates between the outside of the pump housing and the space. It has a structure in which holes are formed.

Effects This invention having such a configuration is designed to prevent moisture from entering between the mechanical seal and the pump housing and into the bearing section, which is interposed between the bearing section and the drive shaft. At least two seal members are used to prevent moisture from leaking into the bearing as much as possible, but in the unlikely event that some leaked water enters the space formed by adjacent seal members, Due to the drainage action of the grease filled in the space, leaked water is drained to the outside through the drainage hole that communicates the space with the outside of the pump housing.

Embodiments Hereinafter, embodiments of this invention will be described based on the drawings.

FIG. 1 is a sectional view showing an embodiment of a water pump according to this invention.

As shown in FIG. 1, the water pump according to this embodiment includes a pump housing 2 having a pump chamber 1 therein, and a drive shaft 4 rotatably supported by a bearing 3 provided in the pump housing 2. and,
An impeller 5 is attached to the end of the drive shaft 4 on the pump chamber 1 side, and a mechanical seal 6 is attached to the drive shaft 4 to provide a liquid-tight seal between the impeller 5 and the pump housing 2. It is equipped with Two seal members 7 and 8 are interposed at a predetermined interval in the axial direction on the mechanical seal 6 side between the bearing portion 3 and the drive shaft 4, and these two seal members 7, A space 9 formed by 8 is filled with grease 10 for discharging moisture that has entered this space 9. On the other hand, an outer ring 3 constituting the pump housing 2 and the bearing part 3
A drain hole 11 that communicates the outside of the pump housing 2 and the space 9 is formed in a. Further, the pump housing 2 is formed with a drain hole 12 for draining leaked water that has entered between the mechanical seal 6 and the pump housing 2 to the outside. A seal member 13 is interposed between the bearing portion 3 and the drive shaft 4 on the opposite side to the mechanical seal 6, and between this seal member 13 and the seal member 7, there is no grease. 10 is filled.

Next, the operation of the water pump according to this embodiment will be explained.

First, the mechanical seal 6
The pump housing 2, mechanical seal 6 and drive shaft 4 are removed from the gap between the pump housing 2 and the pump housing 2.
If a small amount of water leaks into the annular space 14 surrounded by the pump housing 2, it is drained to the outside through the drain hole 12 formed in the pump housing 2.

On the other hand, if a large amount of leaked water enters the annular space 14, the drain hole 12 alone cannot drain all of the leaked water to the outside, and a portion of the water leaks into the bearing part 14.
There is a risk of the product entering the inside of the device. However, since two seal members 7 and 8 are interposed on the mechanical seal 6 side between the bearing portion 3 and the drive shaft 4, the liquid-tight action of these seal members 7 and 8 prevents the leakage. Intrusion of water into the interior of the bearing portion 3 is prevented as much as possible. If a small amount of water leaks through the gap between the outer seal member 8 and the drive shaft 4, it will leak into the gap 9 formed by these seal members 7 and 8.
Even if leaked water enters the inside of the pump housing 2, the leaking water is drained to the outside through the drainage hole 11 formed in the pump housing 2 due to the drainage action of the grease 10 filled in the void 9. It is possible to prevent leakage water from staying in the bearing part 9 for a long period of time and damaging the bearing part 3.

Next, FIG. 2 is a sectional view of a main part showing another embodiment of this invention.

In this embodiment, the large diameter portion 4 formed on the drive shaft 4 is
between a and the outer ring 3a that constitutes the bearing part 3,
While the inner seal member 7A is interposed, the drive shaft 4
Between the small diameter portion 4b formed in and the outer ring 3a,
An inner seal member 8A is interposed, and the space 9 formed by these seal members 7A and 8B is filled with grease 10, and the pump housing 2
A drain hole 11A is formed in the bearing part 3 to communicate the outside of the pump housing 2 and the space part 9.

In this case, the stepped part 4c formed at the boundary between the large diameter part 4a and the small diameter part 4b formed on the drive shaft 4 allows the outer seal member 8A and the drive shaft 4 to be connected to each other. Since the leaked water that has entered the space 9 through the gap between the two is scattered toward the drain hole 11A side, the leaked water can be further prevented from entering the inside of the bearing section 3.

In each of the above embodiments, the bearing portion 3 and the drive shaft 4
Although a case has been described in which two seal members 7, 8, 7A, and 8A are interposed between the two seal members, the present invention is not limited to this, and the number of seal members may be further increased. With such a configuration, it is possible to further prevent leakage water from entering the bearing portion.

Effects of the invention As is clear from the above explanation, according to this invention, when a large amount of moisture enters the bearing section from between the mechanical seal and the pump housing, the connection between the bearing section and the drive shaft is prevented. At least two seal members interposed between each other prevent water from leaking into the bearing as much as possible, but in the unlikely event that some leakage water enters the space formed by the adjacent seal members. In this case, the leakage water can be drained to the outside through the drainage hole that communicates this space with the outside of the pump housing due to the drainage action of the grease filled in the space, thus preventing the leakage. It is possible to prevent the bearing from being damaged by water.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a water pump according to this invention, and FIG. 2 is a sectional view of main parts showing another embodiment of this invention. 1...Pump chamber, 2...Pump housing, 3
...Bearing part, 4 ... Drive shaft, 5 ... Impeller, 6
...Mechanical seal, 7, 8, 7A, 8A...
Seal member, 9...Space, 10...Grease,
11... Drain hole.

Claims (1)

[Scope of utility model registration request] a pump housing having a pump chamber inside;
A drive shaft rotatably supported by a bearing provided in the pump housing, an impeller attached to the end of the drive shaft on the pump chamber side, and a fluid-tight connection between the impeller and the pump housing. In the water pump, the water pump is provided with a mechanical seal mounted on the drive shaft to provide a seal, and at least a mechanical seal is provided at a predetermined interval in the axial direction on the mechanical seal side between the bearing portion and the drive shaft. 2
interposing two seal members, filling the space formed by these adjacent seal members with grease, and communicating the outside of the pump housing and the space through the pump housing and the bearing portion. A water pump characterized by having a drainage hole formed therein.