JPH0517439Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a water pump mainly used in automobiles.

(Prior Art) Conventionally, in water pumps for automobile engines, rust occurs due to water intrusion into the bearings provided in the pump, so as shown in FIG. A mechanical seal d faces the water channel c, and a water return plate f is provided adjacent to the bearing e, and further vertically extends upward on the wall surface of the water return space g between the bearing e and the mechanical seal d. With the configuration in which an atmospheric pressure hole h is drilled in the hole h and a drain hole i is drilled at a downward slope, water leaking from the pump chamber b through the mechanical seal d to the water returning space g can be removed. The water was guided to the drain hole i by the water return plate f and discharged from the drain hole to prevent water from entering the bearing.

(Problem that the invention aims to solve) However, in the conventional configuration described above, the pump chamber cannot be made large because the atmospheric pressure hole and the drain hole are bored. In order to form such a hole, the overall length of the pump must be increased, and furthermore, the drilling of the hole hinders the improvement of the productivity of the pump. Furthermore, when the drain hole is drilled with a small diameter, water remaining in the hole closes the hole, creating a negative pressure in the water return space, causing water in the pump chamber to flow from the mechanical seal to the water return space. On the other hand, if the holes were made to have a large diameter, there was a problem that water and dust could enter from the outside. In addition, to prevent water and dust from entering from the outside, we have developed a water pump with a drain hole covering member fixed to the outer circumference of the pump housing to cover the opening of the drain hole.
-Refer to Publication No. 17128), but there are still problems with productivity, etc.

(Means for Solving the Problems) In view of the above problems, the present invention has a mechanical seal between the pump chamber and a fitting type bearing, and a mechanical seal is provided between the bearing and the mechanical seal. The water pump is characterized in that a plurality of horizontal communication holes are provided that open at the end of the pump casing between the outer circumferential surface of the bearing and the inner circumferential surface of the pump casing from the water return space. be.

(Function) The function of the present invention with the above configuration is that water leaking from the pump chamber to the water return space through the mechanical seal is quickly discharged through the horizontal communication hole, thereby preventing water from entering the bearing. This prevents water from being sucked out into the water return space and also prevents dust and the like from entering from the outside.

(Example) Next, an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a top suction type water pump 1 includes a bearing 3 inserted into a pump casing 2, a rotating shaft 4 supported by the bearing 3, and a rotating shaft 4 facing a pump chamber 5 inside the pump casing 2. a mechanical seal 6 provided, a water return space 8 provided between the mechanical seal 6 and the bearing 3, a water return plate 9 fitted to the rotating shaft 4 in the water return space 8; It is constructed with a vane 10 fitted onto a rotating shaft 4 on the side closer to the engine (not shown) than the pump chamber 5 as a main part.

The pump casing 2 is formed by casting, and has flange parts 2a for attachment to the engine at the front and rear ends.
and a boss portion 2b.
A fitting type bearing 3 is inserted into b, and
The bearing 3 supports a rotating shaft 4. The pump casing 2 also includes a pump chamber 5 and a water channel 5.
A mechanical seal 6 is inserted adjacent to the rotating shaft 4 at a position facing a, and a water return space 8 provided between the mechanical seal 6 and the bearing 3 is attached to the rotating shaft 4. A substantially disc-shaped water return plate 9 is fitted so as to rotate together with the rotating shaft 4. Further, the rotating shaft 4 has a vane 10 at one end that guides water in the pump chamber 5 toward the engine side.
However, a pulley 11 is fitted to the other end, and the pulley 11 is linked via a belt to a crankshaft (not shown) to which the driving force of the engine is transmitted.

On the other hand, on the inner circumferential surface of the boss portion 2b of the pump casing 2, horizontal grooves 2c communicating from the water return space 8 to the end portion 2f of the pump casing 2 are carved in two places (upper and lower). (see figure), by inserting the bearing 3 into the boss portion 2b, the groove 2
Communication holes 2d and 2e formed by the outer peripheral surface of the bearing 3 and the water return space 8 are opened to the end 2f of the pump casing 2.

Next, the driving of the water pump 1 will be explained.

The driving force of the engine is transmitted from the crankshaft to the pulley 11 via the belt.
The rotating shaft 4 and the vane 10 rotate as the rotary shaft 4 rotates. Vane 10 is inlet 1 of water pump 1
The water flowing in from the outlet 1b is guided to the engine side through the water channel 5a and the pump chamber 5 through the outlet 1b (see FIG. 2). At that time, a part of the water flowing in the water channel 5a and the pump chamber 5 may leak from the mechanical seal 6 into the water return space 8. The leaked water is guided to the wall side of the water return space 8 by the water return plate 9 which rotates together with the rotating shaft 4, and is also guided to the wall surface side of the water return space 8 by the water return plate 9 which rotates together with the rotating shaft 4, and is also introduced into the bottom opening from the water return space 8 to the end 2f of the casing 2. It is discharged to the outside of the casing 2 from the side communication hole (drain hole) 2d. On the other hand, the upper communication hole (atmospheric pressure hole) 2e connects the water return space to the casing 2.
The pressure inside the water return space 8 is maintained at atmospheric pressure by communicating with the outside of the water return space 8.

In this embodiment, the communicating holes are provided at two locations, but the present invention is not limited to this, and the number may be increased as appropriate.

(Effect of the invention) As described above, the water pump of the invention has a plurality of horizontal communication holes that open from the water return space to the end of the pump casing between the outer peripheral surface of the bearing and the inner peripheral surface of the pump casing. By providing a large pump chamber, the performance of the pump can be improved.Also, even if the communication hole is provided with a small diameter, water will not be sucked out into the water return space; It has various effects such as preventing the intrusion of dust etc. from the outside even when it is provided in the diameter of the pump, and also being excellent in productivity because the communicating hole can be cast out at the same time as the pump casing is cast. .

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Fig. 1 is a vertical side view of the water pump of the present invention.
2 is a sectional view of the pump casing taken along the - line in FIG. 1, FIG. 3 is a sectional view taken along the - line in FIG. 1, and FIG. 4 is a longitudinal sectional side view of a conventional water pump. 1... Water pump, 2... Pump casing, 2d, 2e... Communication hole, 2f... End, 3...
...Bearing, 5...Pump chamber, 6...Mechanical seal, 8...Water return space.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A mechanical seal is provided between the pump chamber and a fitting type bearing, and the outer circumferential surface of the bearing is A water pump characterized in that a plurality of horizontal communication holes opening at an end of the pump casing are provided between the inner peripheral surface of the pump casing and the inner peripheral surface of the pump casing. (2) The water pump according to claim 1, wherein the communication hole is an atmospheric pressure hole and a drain hole.