JPH0544558Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a water pump for circulating cooling water for an internal combustion engine.

[Prior art]

The mechanical seal of a conventional water pump, which is mainly used for cooling water in internal combustion engines for automobiles, has a seal ring 3 fixed to a pump body 1 and biased by a spring member 2, as shown in FIG.
(Usually manufactured from carbon, ceramic, etc.)
is pressed against a floating sheet 6 (usually made of ceramic) fixed to rotate together with the impeller 4, thereby achieving water sealing when the impeller 4 is rotating and when it is stationary. .

However, the sealing surface of the ceramic floating sheet 6 attached to the impeller 4 side is usually arranged substantially on the same plane as the end surface of the impeller. Therefore, not only rust on the end face of the impeller 4, but also rust that circulates in the cooling water,
Corrosion powder caused by cavitation tends to reach the sealing surface when it settles or flows through the cooling water.
This is true even if the sealing surface is not on substantially the same plane as the end surface of the impeller as described above, or even if it is arranged very close to the impeller.

If rust or corrosive particles reach the sealing surface, since the seal ring 3 and floating sheet 6 are in sliding contact with each other, they may adhere to the sealing surface or damage the sealing surface, causing water to leak out. There was a problem that the seal could not be formed and water leakage often occurred.

Therefore, as shown in Fig. 5, the sealing surface was covered with a filter 7 to prevent foreign matter mixed into the cooling water and circulating from reaching the sealing surface.
There is an idea in Publication No. 101495.

However, in this prior art, by providing the filter 7, it becomes difficult for the cooling water to circulate inside the filter 7, that is, on the mechanical seal side, and the cooling efficiency deteriorates, so the seal surface generates abnormal heat.
The heat may dry it out and cause burn-in. This phenomenon is particularly likely to occur when the filter 7 is clogged, causing problems in the durability and reliability of the mechanical seal.

[Purpose of invention]

The present invention was developed to solve the above-mentioned conventional problems, and prevents foreign matter from entering the sealing surface of the mechanical seal, and also ensures that the cooling water in the pump reaches the sealing part sufficiently. The object of the present invention is to provide a water pump that can circulate water and prevent overheating due to sliding of the sealing surface.

[Structure of the idea]

To achieve the above object, the water pump of the present invention has a seal ring provided on a pump body that pivotally supports a shaft of the water pump, and a floating seat provided on an impeller driven by this shaft. A mechanical seal having a seal portion is provided around the shaft,
A fixed end of a dish-shaped slinger that covers this seal and expands in the direction of the seal ring is fixed so as to rotate together with the impeller, and the free end of this slinger is used to supply cooling water to the seal. The structure is characterized by an open gap for introduction.

The slinger rotates together with the impeller, and the rotational movement of the slinger repels foreign matter in the cooling water circulating in the cooling water channel, rust on the end face of the impeller, etc., and removes foreign matter from the sealing part of the mechanical seal. prevent the intrusion of Note that the foreign matter that has been splashed away is swept away by the water flow of the water pump and removed from inside the water pump.

In addition, the rotation of the slinger promotes the circulation of cooling water around the mechanical seal, helping to cool the sealing portion of the mechanical seal.

Although the shape and mounting structure of the slinger are not particularly limited, it is more preferable to provide fins of various shapes in order to improve the effect of repelling foreign objects and the effect of circulating water around the mechanical seal. It is.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a main part showing a mechanical seal of a water pump in a first embodiment of the present invention.

The water pump shown in FIG. 1 has a mechanical seal having the same structure and function as that shown in the conventional example shown in FIG. 5, and the same parts are given the same numbers and their explanations will be omitted.

In this embodiment, a seal ring 3 made of carbon, ceramic, etc. is interposed between an impeller 4 fixed to a shaft 5 of a water pump and a pump body 1, and a floating seat 6 made of ceramic etc. A slinger 8, which has a shape that widens toward the free end, is fixed so as to rotate together with the impeller 4 so as to cover the outer periphery of the mechanical seal and to allow surrounding cooling water to easily circulate in this part. are doing. The slinger 8 is formed into a dish shape with a hole in the center through which the shaft 5 passes,
Since it is integrally held between the impeller 4 and the floating sheet 6, it rotates in the water as the impeller 4 rotates.

In this way, the slinger 8 is connected to the impeller 4
It protrudes in a tapered shape from between the end of the impeller 4 and the floating sheet 6, which is arranged flush with the end of the impeller 4. When the impeller 4 is stationary, it prevents foreign matter mixed into the cooling water or due to gravity. Rust on the end surface of the impeller 4 sinking in the cooling water is guided so that it does not reach the sealing part where the floating sheet 6 and the seal ring 3 contact.
When the slinger 8 is rotating, the foreign matter that has reached the tapered surface of the slinger 8 is removed by the outer edge 8 ₀
This prevents the foreign matter from reaching the seal portion by guiding it to the water and splashing it to the surroundings, causing it to be caught up in the flow inside the water pump, and generating a water flow by the rotation of this slinger 8, which prevents the foreign matter from reaching the seal portion. Circulate cooling water sufficiently around the area.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 to 4. That is, FIG. 2 is a front view of the slinger 8, FIG. 3 is a side sectional view thereof, and FIG. 4 is a perspective view showing an enlarged main part thereof.

In this embodiment, as shown in FIG. Rib-shaped fins 9, the details of which are shown below, are provided by press working. This fin 9 is the R of slinger 8.
As the slinger 8 rotates in this direction, a water flow W is generated on the outer peripheral side of the slinger 8.

Due to the reverse flow of this water flow W, a water flow is also generated in the cooling water on the inner peripheral side of the slinger 8, that is, around the mechanical seal, so that the seal portion where the seal ring 3 and the floating seat 6 are in contact is sufficiently cooled. As a result, the effect of repelling foreign matter and the effect of cooling the seal portion of the mechanical seal can be further improved.

[Effect of idea]

The water pump of the present invention is a mechanical seal that has a seal portion between a seal ring provided on a pump body that pivotally supports the shaft of the water pump and a floating seat provided on an impeller driven by the shaft. is provided around the shaft, and a fixed end of a dish-shaped slinger that covers this seal portion and expands in the direction of the seal ring is fixed so as to rotate together with the impeller, and a free end of this slinger is fixed so as to rotate together with the impeller. Since the seal portion is characterized by being opened with a gap so as to introduce cooling water, the following effects can be achieved.

Since the slinger rotates together with the impeller while covering the sealing portion between the seal ring and the floating sheet, foreign matter such as rust mixed in the cooling water can be repelled by this rotational movement, It is possible to prevent foreign matter from entering the seal portion.

Additionally, a water flow is generated by the rotation of the slinger, and this water flow can be introduced from the free end of the expanded slinger to the sealing area between the seal ring and the floating seat, which generates frictional heat. The seal portion can be cooled, and this seal portion can be prevented from drying out, thereby preventing seizure.

Therefore, the reliability and durability of the water pump can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts of a water pump according to a first embodiment of the present invention, Fig. 2 is a front view of a slinger used in a water pump according to a second embodiment of the present invention, and Fig. 3 is a sectional view of a main part of a water pump according to a first embodiment of the present invention. FIG. 4 is an enlarged perspective view of a main part of the slinger shown in FIG. 2, and FIG. 5 is a sectional view of a main part of a conventional water pump. 1...Pump body, 3...Seal ring, 4
...impeller, 5...shaft, 6...floating sheet, 8...slinger.

Claims (1)

[Scope of utility model registration request] A mechanical seal having a seal portion between a seal ring provided on a pump body that pivotally supports a shaft of the water pump and a floating seat provided on an impeller driven by the shaft is provided around the shaft. A fixed end of a dish-shaped slinger that covers the sealing part and expands in the direction of the seal ring is fixed so as to rotate together with the impeller, and the free end of the slinger is injected with cooling water into the sealing part. A water pump characterized by being opened with a gap to introduce the water.