JP2537414Y2 - Water pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a water pump used for cooling an engine or the like.

<Conventional technology> Conventional water pumps of this type are described in
No. 07 publication is known.

The water pump is generally described as follows. An impeller is fixedly mounted at one end of a pump shaft pivotally connected to a pump housing via a bearing, a mechanical seal is provided between the impeller and the bearing, and a hollow space between the bearing and the mechanical seal is provided. The chamber is formed with an upper drain passage and a lower drain passage communicating with the outside of the pump housing. Then, the pump shaft driven by the engine pumps the cooling water in the cooling water passage by the impeller, and when a part of the cooling water leaks from the mechanical seal, mainly the steam is discharged from the upper drain passage to the lower drain passage. The cooling water mainly leaking from the side drain passage is discharged to the outside of the pump housing.

《Problems to be solved by the invention》 However, in such a conventional water pump, since the upper drain passage is formed to be opened directly to the outside of the pump housing, muddy water that is splashed up while the vehicle is running may be removed. , Dust and the like easily enter the hollow chamber. Therefore, once muddy water or the like once enters the hollow chamber, it reaches the seal portion of the mechanical seal from between the pump shaft and the mechanical seal, and foreign matter adheres to the seal portion, which causes a reduction in the sealing function of the mechanical seal. Deterioration of the sealing function causes leakage of cooling water.

The present invention has been made in view of such a problem of the conventional water pump, and an object of the present invention is to prevent foreign substances from entering the sealing portion of the sealing device even if foreign substances enter through the drain passage. Another object of the present invention is to provide a water pump having a reduced size.

<< Means for Solving the Problems >> In order to achieve the above object, in the present invention, an impeller is fixedly mounted at one end of a pump shaft pivotally connected to a pump housing via a bearing, and the impeller and the bearing are connected to each other. A water pump provided with a seal device between the bearings, and formed with upper and lower drain passages for communicating a hollow chamber between the bearing and the seal device with the outside of the pump housing, wherein at least the upper drain of the drain passages is provided. A dust cover is provided facing the hollow chamber side opening of the passage, and a recess is formed in the dust cover.

<< Operation >> According to this water pump, even if muddy water or the like enters the hollow chamber from the upper drain passage, the muddy water or the like is caught by the dust cover and reliably guided downward by the concave portion of the dust cover. It does not reach the sealing device from the shaft.

<< Example >> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing a first embodiment of the present invention, and FIG.
Is a pump housing, and this pump housing 11
The bearing 14 through which the pump shaft 13 is inserted is fitted into the bearing hole 12. An impeller 15 is fitted to one end of the pump shaft 13, and a mechanical seal 17 is disposed between a back surface of the impeller 15 and a seal hole 16 formed with a smaller diameter than the bearing hole 12. And the bearing 14 and the mechanical seal
A hollow chamber 18 is formed between the pump housing 11 and the hollow chamber 18. The hollow chamber 18 is formed in the upper and lower sides of the hollow chamber 18 so as to communicate with the outside of the pump housing 11. A steam hole 19 and a drain hole 20 are formed. And
A cylindrical dust cover 22 fixed to an annular projection 21 formed on the mechanical seal 17 side of the hollow chamber 18 is disposed at a position facing the open end 19a of the steam hole 19 on the hollow chamber 18 side. The free end 22a of the dust cover 22 is formed in a flange shape, and has a small-diameter annular recess 22b in the center.

Therefore, according to this embodiment, when muddy water or the like enters the hollow chamber 18 from the steam hole 19, it adheres to the dust cover 22 and falls down along the outer periphery of the dust cover 22, and finally from the drain hole 20. It is discharged to the outside of the pump housing 11. Here, even if a large amount of muddy water or the like enters through the steam holes 19, the concave portion 22b formed in the dust cover 22 has a sufficient depth and does not overflow from the free end 22a side. In this way, the pump housing
Even if foreign matter such as muddy water enters the interior of the pump 11, the foreign matter does not adhere to the pump shaft 13, and therefore the seal portion 17a of the mechanical seal 17 is not damaged.

FIG. 2 is a view showing a second embodiment of the present invention, which is different from the first embodiment in that a dust cover 122 is inserted into a seal hole 16 formed in the pump housing 11. is there. By doing so, not only is the annular projection 21 of the hollow chamber 18 of the first embodiment unnecessary, but also the dust cover 122 is formed by pressing or the like without increasing the processing accuracy of the seal hole 16 so much. Therefore, the inner diameter of the dust cover 122 can be formed with high accuracy. Thereby, the number of steps required for processing the annular projection 21 and the seal hole 16 can be significantly reduced, and the manufacturing cost can be reduced. The function of the recess 122b is not changed at all.

FIG. 3 is a view showing a third embodiment of the present invention, which differs from the second embodiment in that a notch 222 a is formed below the dust cover 222. This notch 222a
In the event that part of the cooling water leaks from the mechanical seal 17, the cooling water is drained from the drain hole 20 without remaining in the dust cover 222. The operation of the recess 222b does not change at all.

<< Effects of the Invention >> As described above, according to the water pump of the present invention, at least the upper and lower don passages are provided with a dust cover facing the hollow chamber side opening of the upper drain passage, and the dust cover is provided on the dust cover. Even if muddy water or the like enters the hollow chamber from the upper drain hole due to the formation of the concave portion, the muddy water or the like overflows from the dust cover because the concave portion provided in the dust cover has a sufficient depth. And the sealing device is not damaged.

[Brief description of the drawings]

1 is a sectional view of a water pump according to a first embodiment of the present invention, FIG. 2 is a sectional view of a main part of a water pump according to a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. It is principal part sectional drawing of the water pump concerning an example. 11 ... Pump housing, 13 ... Pump shaft, 14 ... Bearing, 15 ... Impeller, 17 ... Mechanical seal, 18 ...
Hollow chamber, 19: steam hole (upper drain passage), 20: drain hole (lower drain passage), 22, 122, 222 ... dust cover, 22b, 122b, 222b ... recess.

Claims (1)

(57) [Scope of request for utility model registration] An impeller is fixedly mounted at one end of a pump shaft pivotally connected to a pump housing via a bearing, a seal device is provided between the impeller and the bearing, and a hollow space is provided between the bearing and the seal device. A water pump having upper and lower drain passages communicating the chamber with the outside of the pump housing, wherein a dust cover facing at least a hollow chamber side opening of the upper drain passage of the drain passages is provided; A water pump having a recess formed therein.