JPS6221999B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device for a shaft portion of a water pump mainly used in a water-cooled engine.

Conventionally, in this type of device, an impeller is provided at the tip of a rotating shaft in a pump chamber having an inlet and an outlet, and an outer periphery is provided in a recess formed in the wall of the pump chamber on the outer periphery of the shaft on the back side of the impeller. A type that includes a rear fixed ring that is fitted through a seal packing, a front rotating ring that rotates along with the shaft, and a spring in front of the ring that presses both rings against each other. In this case, the seal packing extends to the back of the fixing ring and acts as an elastic packing interposed between the fixing ring and the annular seat in the recess on the back side of the fixing ring. In such a ring, the fixed ring is supported in a floating state by the packing, which tends to cause surface runout, and the contact between it and the rotating ring in front of it is somewhat unstable. It comes with the inconvenience of being a winner.

The object of the present invention is to obtain a device free from such inconveniences, and an impeller is provided at the tip of a rotating shaft in a pump chamber having an inlet and an outlet, and an impeller is provided at the tip of the rotating shaft on the back side of the impeller. a rear fixed ring that is fitted into a recess formed in the wall surface of the pump chamber via a seal packing on the outer periphery, and a rotary ring in front of the fixed ring that rotates along with the shaft;
In a type in which a spring is disposed in front of both rings to press them against each other, an opening is formed in the center of the seal packing extending on the back side of the fixed ring, and the ring is inserted into the recess. It is abutted and supported on an annular seat that protrudes inward.

An example of implementing the present invention will be explained with reference to the attached drawings. In the drawings, reference numeral 1 indicates a pump housing, and reference numeral 2 indicates a rotating shaft inserted and supported by the pump housing, and the rotating shaft 2 is connected to a drive source at a pulley 3 at its tail end. The pump housing 1 is integrally provided with a pump chamber 6 having an inlet 4 and an outlet 5 in its front part, and has an impeller 7 fixed to the tip of the shaft 2 in the pump chamber 6. and the shaft 2 on the back side thereof.
a rear fixing ring 10 that is fitted into a recess 8 formed in the wall surface of the pump chamber 6 via a seal packing 9 on the outer periphery; A mechanical seal is constructed by comprising a rotating ring 11, a coil-shaped spring 12 in front of the ring 11 that presses the rings 10 and 11 against each other, and a packing 13 on the inner periphery thereof. In the drawings, reference numeral 14 indicates an annular seat protruding into the recess 8, and the fixing ring 11 is supported by the seat 14 from its back surface.

Although the above is not particularly different from the conventional one, according to the present invention, an opening 15 in the center is formed in the seal packing 9 extending on the back side of the fixing ring 10,
Place the ring 10 in the opening 15 and insert the catch 14 into the opening 15.
It was designed so that it was in contact with and was supported directly by this. That is, the packing 9 is removed from between the ring 10 and the seat 14, and the ring 10 and the seat 1 are removed.
4 were in direct contact with each other. In this way, the fixed ring 10 is stably supported on the seat 14 without causing any surface wobbling, and good and stable surface contact can be obtained between it and the rotating ring 11 in front of it.

In the illustrated embodiment, the rotary ring 11 is brought into contact with the fixed ring 10 at the annular convex portion 17 on the back surface, and in this case, the rotary shaft 2 is formed with a step 16 at its tip to have a small diameter. Thus, the annular convex portion 17 is provided with a relatively small diameter close to the outer periphery of the shaft 2, so that its circumferential speed is reduced as much as possible. Furthermore, in the illustrated example, the annular convex portion 17, the above-described coiled spring 12 in front of it, and the above-described annular seat 14 behind it are formed to have approximately the same diameter and are concentric with each other. The rings 10 and 11 are arranged in three stages, front and rear, so that the spring 1 in the front is connected to the annular convex portion 17 between the two rings 10 and 11.
2 and the rear catch seat 14 to prevent it from falling or swinging.

According to the present invention, an opening is formed in the center of the seal packing on the outer periphery extending on the back surface of the fixed ring, and the ring is exposed within the opening.
This is supported in contact with the annular seat on the back side of the exposed part, which provides stable support for the ring, improves surface runout accuracy, and improves sealing performance due to cooperation with the rotating ring. It has the effect of improving the

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of one example of the device of the present invention;
The figure is an enlarged cross-sectional side view of the main part. 2... Rotating shaft, 4... Inlet, 5... Outlet, 6... Pump chamber, 7... Impeller, 8... Recess, 9... Seal packing, 10... Fixed ring, 11... Rotating ring, 12... Spring, 14... Annular catch, 15...
Opening.

Claims (1)

[Scope of Claims] 1. An impeller at the tip of a rotating shaft is provided in a pump chamber having an inlet and an outlet, and an impeller is provided at the outer periphery of the shaft on the back side within a recess formed in the wall of the pump chamber. A fixed ring at the rear that is fitted through a seal packing on the outer periphery, a rotating ring in front of the ring that rotates along with the shaft, both rings, and a spring in front of the ring that presses both rings together. In the seal packing extending on the back surface of the fixing ring, an opening is formed in the center, and the ring is brought into contact with an annular seat protruding into the recess within the opening. A sealing device for a water pump that is supported. 2. A sealing device for a water pump as set forth in claim 1, wherein the rotating shaft is stepped at its tip end to form a small diameter, and the rotating ring is fitted on the outer periphery of the rotating shaft. 3. Both rings are brought into contact with each other by at least one annular convex portion thereof, and the convex portion, the annular seat, and the spring are formed to have approximately the same diameter, and the front and rear portions are approximately concentric with each other. Enclosure No. 1 of patent claims arranged in three stages
Water pump sealing device listed in section.