JPS5813120Y2 - Water pump mechanical seal protection device - Google Patents

Description

[Detailed description of the invention] This invention prevents foreign matter such as dust and steel powder contained in the liquid from getting caught in the sliding part of the mechanical seal provided between the housing and the impeller. Pertains to mechanical seal protection devices for water pumps.

Conventionally, water pumps have been known in which an impeller is rotatably supported within a housing and a mechanical seal is provided between the housing and the impeller, and the mechanical seal seals between the stationary housing and the rotating impeller. Widely used as a water pump for circulating cooling water in automobile internal combustion engines.

The mechanical seal of this type of water pump achieves water retention by bringing the fixed member supported by the housing into sliding contact with the rotating member supported by the impeller, and by maintaining the sliding part with high flatness and surface roughness. Therefore, it is important to maintain the sliding surfaces in good condition.

However, the liquid handled by a water pump often contains various fine particles.For example, in a water pump that circulates cooling water for an automobile's internal combustion engine, the cooling water is in a sealed circulation path, so it may not be possible to collect it from the outside. Conditions 1 are relatively good in that there is little risk of foreign matter entering, but there are still foreign matter such as dust that gets mixed in during liquid exchange, steel powder from metal parts such as impellers, etc. in the flow path.

Since the liquid in the pump chamber directly acts on one side of the sliding part of the mechanical seal, fine particles contained in the liquid may get caught in the sliding part, resulting in damage to the sliding surface. There were cases where it could get scratched and cause fluid to leak.

The present invention was developed in view of these points, and its purpose is to prevent fine particles contained in the liquid from getting caught in the sliding parts of the mechanical seal. In a mechanical sealer pump, an impeller is rotatably supported within the housing, and a dust-proof ring is provided between the housing and the impeller, the ring body having a large number of through holes is coated with a filtering material, and an elastic lip is provided at one end. , a mechanical seal is provided between the housing and the impeller, with an elastic lip fixed to one side and slidably in contact with the other, surrounding the mechanical seal.

The present invention will be described in detail below based on an embodiment shown in the drawings.

In FIG. 1, an impeller 2 is attached to the inner end of a shaft 11 rotatably supported within a housing 1 via rolling bearings 9 and 10.
is press-fitted.

On the other hand, a drive pulley 12 is provided at the outer end of the shaft 11.

A mechanical seal 3 is also provided between the housing 1 and the impeller 2.

As shown in an enlarged view in FIG. 2, the dustproof ring 8 has a large number of through holes 4.
A ring body 5 made of a thin plate is covered with felt 6 as a filtering material, and a rubber lip 7 is baked on one end.

The dustproof ring 8 is press-fitted into a protrusion on the inner wall of the housing 1, and the mechanical seal 7 is in slidable contact with the rear end surface of the impeller 2.

In this way, the dust-proof ring 8 is provided by fixing one end to the housing 1, surrounding the mechanical seal 3, and bringing the elastic lip 7 at the other end into slidable contact with the impeller 2, thereby preventing dust from being contained in the liquid handled by the pump. The fine particles of foreign matter do not reach the inside of the dust-proof ring 8, so that a clean liquid always acts on the sliding part of the mechanical seal 3, and no foreign matter gets caught in the sliding surface.

Also, since the dustproof ring has relatively rigidity due to its ring body,
It will not be inadvertently deformed due to hydraulic pressure or the like and will not lose its function.

Furthermore, even if the pump is mistakenly operated temporarily in a state of running out of liquid, the liquid is retained in the area surrounded by the dust-proof ring, thereby preventing the mechanical seal from drying out.

Incidentally, the dustproof ring 8 may be provided on the impeller 2.

In this case, the elastic lip 7 of the dustproof ring is brought into contact with the inner end wall of the housing 1.

Alternatively, the elastic lip 7 may be made separately and fitted onto one end of the ring body 5.

In addition to felt, woven fabric, filter paper, etc. can be used as the filter material 6.

Since the present invention is as described above, fine particles present in the liquid will not get caught in the sliding surface of the mechanical seal, and even if the pump malfunctions when the liquid is wet, the mechanical seal will remain dry. It has the effect that it will not be affected.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the present invention - an embodiment, Fig. 2 is a dust-proof ring 8
FIG. Explanation of symbols 1...Housing, 2...
・Impeller, 3... Mechanical seal, 4...
...Through hole, 5... Ring body, 6...
Filter material, 7...Elastic lip, 8...Dust-proof ring.

Claims (1)

[Claims for Utility Model Registration] An impeller 2 is rotatably supported in a housing 1, and a mechanical seal is provided between the housing 1 and the impeller 2, and a filter material 6 is attached to an annular body 5 having a large number of through holes 4. A dust-proof ring 8 is provided with an elastic lip 7 at one end.
A mechanical seal protection device for a water pump, characterized in that a mechanical seal 3 is provided between a housing 1 and an impeller 2, with an elastic lip 7 fixed to one side and slidably in contact with the other, surrounding a mechanical seal 3. .