JP3383888B2 - Water pump structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a water pump for circulating cooling water, which is mounted as a cooling device for an engine. 2. Description of the Related Art Conventionally, as a water pump of this type, for example, as shown in FIG. 3, a pump body 1 has a pump shaft 2 rotatably supported via a bearing 3 and a pump shaft 1. An impeller 5 is keyed to an end of the pump chamber 4 on the side of the pump chamber 4, and a seal member 6 is attached to the impeller 5 side via a seal spring 7 to seal the pump chamber 4. A pulley 8 is attached to the other end of the pump shaft 2. Further, a space t is formed between the bearing 3 and the seal member 6 supporting the pump shaft 2 of the protrusion 1a constituting the rotating part of the pump body 1, and the space t has a cooling water. Is formed as fine vapor from between the pump body 1 and the seal member 6, so that the projection 1 a is formed with a vapor drain hole 9 and a water drain hole 10 penetrating to the atmosphere side. [0003] However, in the conventional water pump, even if there is water leakage from the seal member 6, there is no part for detecting the water leakage, and it is difficult to detect the leakage. There is a problem, and since the steam vent hole 9 and the water vent hole 10 are open to the atmosphere, foreign matter invades and damages the bearing 3 and the seal member 6 to cause cooling water leakage. Had a problem that could cause the engine to overheat. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a water pump capable of detecting a water leak beforehand and preventing overheating of an engine with an extremely simple structure. It is the purpose. [0005] In order to solve the above-mentioned technical problems, the present invention relates to a structure of a water pump attached to an engine, which is formed in a space of a projecting portion of the water pump. The steam vent hole is formed so as to communicate with the intake manifold, and the water vent hole formed in the space is provided with a water droplet detecting device.
It consists of a step tube communicating with the air and two electrodes,
These two electrodes are configured to be provided at an interval at which a water droplet can be detected . With the above construction, fine steam is discharged to the intake manifold at normal times, and early detection of water leakage is possible. FIG. 1 is a sectional view of a water pump 20 according to an embodiment of the present invention. The pump shaft 22 is rotatably supported via a bearing 23, and an impeller 25 is keyed to an end of the pump shaft 22 on the pump chamber 24 side, and a seal member 26 is provided on the impeller 25 side. Is mounted via a seal spring 27 to hermetically seal the pump chamber 24, and a pulley 28 is mounted to the other end of the pump shaft 22. A space t is formed between the bearing 23 and the seal member 26 for supporting the pump shaft 22 of the protrusion 21a constituting the rotating part of the pump body 21 as in the prior art. Cooling water is supplied to the pump body 21 and the sealing member 26.
Since the fine particles enter as fine steam from the space between them, a steam drain hole 29 and a water drain hole 30 communicating with the atmosphere side are formed through the projecting portion 21a. The water pump 20 provided as described above
One end of a connection pipe 31 made of a synthetic resin or the like is attached to a steam vent hole 29 penetrated by the projection 21a of the first connection part, and the other end of the connection pipe 31 is connected to an intake manifold (not shown). A water drop detecting device 32 is provided in the drain hole 30.
Are detachably attached. This water drop detection device 32
Has a water tank 33 having a predetermined capacity. The water tank 33 is communicated with the space t through a mounting pipe 34 attached to the drain hole 30, and the upper side of the tank 33 has a side wall passage 35. Through the atmosphere downward. A water level sensor 37 is attached to the side wall 36 of the water level tank 33 and is connected to a display on the instrument panel side. With the above-described structure, fine steam leaking from the seal member 26 during normal operation of the engine is sucked by the negative pressure of the intake manifold. Further, when the engine is stopped, the steam condenses. However, since the steam is almost forcibly sucked into the intake manifold during operation, no water droplets accumulate in the water level tank 33. When water leaks from the seal member 26, the large water leaking water immediately flows into the water level tank 33 from the water drain hole 30, thereby raising the water level of the water level tank 33 to a predetermined height. When it reaches, the water level is detected by the water level sensor 37 and displayed on the instrument panel side, so that the water leak of the water pump 20 can be visually confirmed, thereby preventing the engine from overheating due to the water leak of the water pump 20. be able to. The steam vent hole 29 is connected to the connecting pipe 31.
And the drain hole 30 is communicated with the atmosphere by the side wall passage 35 facing downward via the water level tank 33, so that no foreign matter enters the space t. In particular, the drain hole 30
Even if foreign matter intrudes from the side wall passage 35 on the side, the foreign matter falls into the water level tank 33 and can be prevented from entering the space t. FIG. 2 shows another embodiment of the water drop detecting device, in which the steam vent hole 29 is connected to the intake manifold as in the above embodiment, and is attached to the water drain hole 30. 40 is the step tubes 41 and 2
The step tube 41 includes a large-diameter mounting tube portion 4 that is mounted in the drain hole 30.
2 and a small-diameter tube portion 43 are integrally formed, and a small-diameter tube portion 43 adjacent to the large-diameter mounting tube portion 42 has a contact detection electrode 45 comprising electrodes 46 and 47 at predetermined intervals in the axial direction thereof. Is provided. That is, when water leaks from the seal member 26 and water droplets transmitted through the large-diameter mounting tube portion 42 flow into the small-diameter tube portion 43, the water droplets are formed by the two poles 46 and 47.
They are provided at intervals so that they can be closed and can be energized, and are displayed on the instrument panel side. Therefore, the water droplet detecting device 40 also has the same operation and effect as the above embodiment. According to the present invention, as described above, fine steam leaking from the seal member during normal operation of the engine is sucked by the negative pressure of the intake manifold. When the operation is stopped, the steam condenses, but during the operation, the steam is almost forcibly sucked into the intake manifold. If water leaks from the sealing member , the water droplet detection device
Therefore, overheating of the engine due to water leakage of the water pump can be prevented. Further, since the steam vent hole is connected to the intake manifold, and the water vent hole is communicated with the atmosphere via the water droplet detecting device, it is possible to prevent foreign matter from entering the space.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a water pump. FIG. 2 is a cross-sectional view illustrating another embodiment of the water leak detection device. FIG. 3 is a partial sectional view of a conventional water pump. [Description of Signs] 20 Water pump 21 Water pump body 21a Projecting portion 29 Steam vent hole 30 Water vent hole 32, 40 Water droplet detecting device 33 Water level tank 35 Side wall passage 37 Water level sensor 41 Step tubes 46, 47 Electrode t Space

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Claims (1)

(57) [Claim 1] A structure of a water pump attached to an engine, wherein a projecting portion 21a of the water pump 20 is provided.
The steam vent hole 29 formed in the space t of the above-mentioned space communicates with the intake manifold, and the water drain hole 30 formed in the space t of the space t is provided with a water droplet detecting device 40.
The drop detecting device 40 is a stepped chip that communicates the space t with the atmosphere.
Tube 41 and two electrodes 46 and 47.
A water pump structure in which the electrodes 46 and 47 are provided at intervals capable of detecting water droplets .