JPH06257593A - Shaft sealing device of coolant pump - Google Patents

Abstract

PURPOSE:To prevent liquid leaks from a tank and immersion of an electric motor by suppressing water droplets that are directed upwards from the outer surface of a flinger. CONSTITUTION:A coolant pump comprises an electric motor installed on a tank and a pump in a liquid 5. The pump comprises a casing 6 surrounding an impeller 4 mounted to the drive shaft 3 of the electric motor and immersed in a liquid 5 with the drive shaft 3 passed through the casing, a suction port 7 provided in the lower portion of the casing 6, and a shaft sealing device 19 close to the upper side of the casing 6 and secured to the drive shaft. The shaft sealing device 19 comprises a boss 19a secured to the drive shaft 3 and a flinger 19b integrated with the boss 19a and having its inner and outer surfaces opened downwards. A liquid 31 ejected from a clearance 30 is suppressed by the inner surface of the flinger 19b and water droplets 32 migrating to the outer surface of the flinger are directed downwards along a slope so as to suppress water droplets that are directed upwards.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft seal device for a coolant pump, which comprises an electric motor installed on a tank and a pump immersed in a liquid below.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a main part of a conventional example. In the figure, this coolant pump includes a casing 6 (6a, 6b) which surrounds an impeller 4 mounted on a drive shaft 3 and which is penetrated by the drive shaft 3 and immersed in a liquid 5, and the casing 6
And a shaft sealing device 9 which is fixed to the drive shaft 3 so as to approach the casing 6. The drive shaft 1 is a part of an electric motor (not shown) installed on the tank (not shown) and arranged in the atmosphere.

The shaft sealing device 9 is composed of a boss 9a fixed to the drive shaft 1 and a flinger 9b which is integrated with the boss 9a and has an inner surface opened downward and a cylindrical outer surface.

[0004]

In the above-mentioned conventional example, the liquid 31 ejected from the gap 30 between the drive shaft 3 and the casing 6a is suppressed on the inner surface of the flinger 9b, but the water droplets 32 transmitted to the outer surface are formed on the inner surface of the flinger 9b. It is pushed by the liquid ejected from and faces upward. Therefore, the fuel is injected into the gap above the tank or the lower surface of the electric motor. This results in liquid leakage from the tank and flooding of the electric motor.

An object of the present invention is to provide a shaft seal device for a coolant pump which suppresses water droplets directed upward from the outer surface of a flinger to prevent liquid leakage from a tank and water from entering a motor.

[0006]

A coolant pump shaft sealing device of the present invention encloses an electric motor installed on a tank and placed in the atmosphere, and an impeller attached to the drive shaft of the electric motor. A casing which is penetrated and immersed in the liquid, and a suction port provided in the lower portion of the casing,
A shaft sealing device for a coolant pump, comprising: a shaft sealing device that approaches the casing and is fixed to the drive shaft, wherein the shaft sealing device is a boss fixed to the drive shaft;
It is composed of a flinger which is integrated with this boss and whose inner and outer surfaces are opened downward.

[0007]

With this structure, the liquid ejected from the gap between the drive shaft and the casing is suppressed on the inner surface of the flinger, and the water droplets transmitted to the outer surface are directed downward along the slope. For this reason, water drops directed upward from the outer surface of the flinger are suppressed to prevent liquid leakage from the tank and water ingress to the electric motor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of the essential parts of the first embodiment, and FIG.
FIG. 3 is a front view of the whole of FIG. 3, and FIG. In the conventional example and in each drawing, those denoted by the same reference numerals have approximately the same function, and duplicate explanation may be omitted.
In FIG. 1 and FIG. 2, the coolant pump surrounds an electric motor 2 installed on a tank 1 and arranged in the atmosphere, and an impeller 4 attached to a drive shaft 3 of the electric motor 2 so that the drive shaft 3 penetrates through the impeller 4. Casing 6 (6
a, 6b), a suction port 7 provided in the lower portion of the casing 6, and a shaft sealing device 19 that is fixed to the drive shaft 3 by approaching the casing 6.

A feature of the first embodiment is that the shaft sealing device 19 is provided.
Is a boss 19a fixed to the drive shaft 3 and the boss 19a.
and a flinger 19b which is integrated with a and whose inner and outer surfaces open downward. The outer diameter of the boss 19a is larger than the outer diameter of the base of the flinger 19b. Shaft sealing device 2 of Example 2 shown in FIG.
Reference numeral 9 denotes a boss 29a fixed to the drive shaft 3 and the boss 2a.
9a and a flinger 29b which is integrated with the inside and outside and opens downward. The outer circumference of the boss 29a is an extension of the outer surface of the flinger 29b.

With such a structure, the liquid 31 ejected from the gap 30 between the drive shaft 3 and the casing 6a is suppressed on the inner surface of the flinger 19b or 29b, and the water droplets 32 transmitted to the outer surface are directed downward along the slope. Turn to. For this reason, water droplets that are directed upward from the outer surface of the flinger 19b or 29b are suppressed to prevent liquid leakage from the tank 1 and flooding of the electric motor 2.

[0011]

According to the shaft seal device for a coolant pump of the present invention, since the inner and outer surfaces of the flinger of the shaft seal device are opened downward, water droplets transmitted to the outer surface are directed downward along the slope and upward from the outer surface of the flinger. This has the effect of suppressing the water droplets that face to prevent liquid leakage from the tank and flooding of the electric motor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a first embodiment.

FIG. 2 is an overall front view of FIG.

FIG. 3 is a cross-sectional view of a main part of the second embodiment.

FIG. 4 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

3 Drive Shaft 4 Impeller 5 Liquid 6 Casing 19 Shaft Sealing Device 19a Boss 19b Flinger 30 Gap 31 Liquid 32 Water Droplet

Claims (1)

[Claims] 1. A motor mounted on a tank and placed in the atmosphere, a casing surrounding an impeller mounted on a drive shaft of the motor and penetrating the drive shaft to be immersed in a liquid, and the casing. In a shaft seal device for a coolant pump, which includes a suction port provided in a lower portion of the casing, and a shaft seal device that is fixed to the drive shaft by approaching the casing.
A shaft sealing device for a coolant pump, characterized in that the shaft sealing device comprises a boss fixed to the drive shaft and a flinger which is integrated with the boss and whose inner and outer surfaces are downwardly opened.