JP2756641B2 - Cartridge type waterproof seal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cartridge type watertight seal device which is improved to realize a watertight seal for an electric water pump more reliably and more durably than the conventional one. Related to a sealing device.

[0002]

2. Description of the Related Art The shaft sealing system of an electric water pump which is currently in practical use is a surface contact system or a sealing in an axial direction, both of which involve friction of a ceramic material.

[0003]

When such a conventional sealing device is applied, there is a possibility that a high temperature may be generated and the pump shaft may be 2,000 to 8,000 rp.
High speed rotation at m. Hazardous suspended solids in water and other conditions can reduce the efficiency of the pump and prevent it from exhibiting the expected durability, and may even damage the motor, especially with large pumps.

[0004]

SUMMARY OF THE INVENTION In view of the above problems in conventional sealing devices, the radial sealing device of the present invention, that is, the radial sealing device, which has been developed to solve the problem particularly in large-scale equipment, is essentially provided. It has a rubber-elastic member and a plastic member, and these two members are combined and mounted on a metal frame, with or without a spring, and a flange that acts as a seal directly to the pump shaft. The structure is such that there is no sliding contact.

[0005]

Since the present invention has such a configuration, the member slides on the raceway surface of the frame so that there is no fear of abrasion, and the shaft, that is, the peripheral surface of the shaft is subjected to static pressure or dynamic pressure. There is no need to form any blocking wall or the like to withstand, and there is no danger of causing whirlwind disturbance of water, additives and other substances therein under normal operating conditions of the pump.

[0006] Yet another important advantage is that no special processing is required on the pump body.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a cartridge type water stopping device in which the present invention is applied to a shaft of a pump. For convenience, the main part is partially shown in a cross section.

[0008] The device shown in the drawing is a shaft of an electric water pump.
Dry area (2) along the axis to flood seal (1)
It seals and seals from (3) and has annular frames (4) and (5) for radially sealing the shaft (1). The frame mounted in the annular space between the shaft (1) and the outer wall (6) of the pump body includes an outer fixed portion (4) which is tightly fitted to the inner surface of the outer wall (6) of the pump body, and a shaft ( It comprises an inner movable part (5) which is rigidly and integrally attached to 1). Annular frame
(4) Two seal members (7) and (8) held inside (5)
Is a plastic member (7) located in the inundation area (3),
A rubber elastic member (8) located in the drying area (2). These two members are disposed in the outer fixed portion (4) of the annular frame, and have appropriate track surfaces formed as outer surfaces of the inner movable portion (5) of the frames (4) and (5). (9) The sealing action is achieved by sliding contact.

Outer fixed portions of the annular frames (4) and (5)
(4) is an inverted U-shaped ring, the outer surface of an axial cylindrical portion (10) forming the ring is covered with a vulcanized and cured rubber elastic material layer (11), and the outer wall of the pump body ( 6) is in a state of being pressed with a predetermined tightening allowance. Of the two radial flanges (12) and (13) protruding and extending from the cylindrical portion (10), the former (12) having a slight Z-shape is located in the flooded area (3) of the pump. In addition, the other linear flange (13) is formed after the sealing device is mounted so as to be located in the drying area (2).

The inner movable part (5) of the annular frame is U-shaped.
Two flanges (15) and (16) having a straight cross section and a Z-shape protrude in a radial direction from an axial cylindrical portion (14) forming the ring.

The straight flange (15) is provided in the above-mentioned inundation zone (3).
And the outer fixed part (4) of the frame is outside the corresponding flange (12), the free end of which slightly exceeds the free end of the flange (12). The flange (15) of the movable part is a member that closes the end face of the sealing device, and at the same time, cooperates with the flange (12) of the fixed part to act as a base for mounting the device. .

The other Z-shaped flange (16) is located in the drying zone (2), the lower part of which is the outer fixed part of the frame.
Outside the corresponding flange (13) of (4), the free end of which extends beyond the free end of the flange (13);
It is located inside (4) and (5).

The inner surface of the axial tubular portion (14) is the raceway surface (9) where the sealing members (7) and (8) are pressed against each other, and the outer surface of the tubular portion is a vulcanized and cured rubber. It is covered with an elastic material layer (17). This vulcanization-hardening ensures a predetermined tightening allowance between the cylindrical portion (14) and the shaft (1). Then, this elastic material layer (1
7) also covers the entire outer surface of the Z-shaped flange (16) on the dry area (2) side, and the free end of the flange (16) prevents backflow of fluid, powder and other substances. Embankment (18)
Is formed. The Z-shaped flange (16) covered with the elastic material layer (17) also functions as a stopper when asobi occurs due to wear between the components of the device.

A rubber elastic member (8) as the seal member
Is formed by vulcanizing and baking the supporting metal rings (19) and (20) having an L-shaped cross section. The ring has an axial cylindrical portion (19) fixed in contact with the inner surface of the outer fixed portion (4) of the frames (4) and (5), and has a slight Z-shape and extends from the cylindrical portion. And a radial flange (20). The rubber elastic member (8) is inserted into the flange (20) in the radial direction.

At least three flanges or lip-shaped protrusions (21) formed on the elastic member (8) are connected to the frame.
(4) A sealing function is provided in close contact with the raceway surface (9) as the inner surface of the movable portion (5) of (5). A spring or garter (22) of a type such as a known oil seal is wound around the first lip-shaped ridge (21) located in the dry area (2), and is urged toward the raceway surface (9). There may be.

A rubber elastic member is provided between an intermediate portion of the Z-shaped flange (20) of the supporting metal rings (19) and (20) and an inner surface of the Z-shaped flange (16) of the frame movable portion (5). 8) forms an embankment-shaped enlarged portion (23) located in the dry area (2), and this enlarged portion acts as a hydrodynamic sealing material for preventing backflow of grease or the like as a lubricant of the device. Along with
It regulates the asobi cost between components when the device is mounted on the pump.

A plastic member as the seal member
(7) is a deformed annular plate. The peripheral edge of the annular plate has a Z-shaped cross-sectional radial flange (20) of the supporting metal ring for the rubber elastic member (8) and an L-shaped second support. Ring (2
4) and (25) are sandwiched between the radial flanges (24). The axial tubular portion (25) of the second support ring is fixed to the inner surface of the frame outer fixed portion (4) together with the axial tubular portions (19) of the support metal rings (19) and (20). ing. An intermediate portion of the plastic member (7) is curved toward the flooded area (3), and an inner edge of the member (7) is pressed against the sealing action raceway surface (9). Further, a hydrodynamic seal groove (26) may be formed in the intermediate portion and the inner end edge of the member (7).

The plastic member (7) is desirably made of polytetrafluoroethylene (PTFE) or wear-resistant polyamide.

At the time of assembling the sealing device, a specific grease (27) is filled, and in particular, a space formed between the raceway surface (9) and the lip-shaped ridge or flange is filled.
I do.

Among the metal parts constituting the above-mentioned apparatus, those which come into contact with water are subjected to a rust prevention treatment.

The representative embodiments of the present invention have been described above. However, the present invention can be appropriately modified and implemented as long as the above-described essential components are provided, the above-described object of the invention is achieved, and the following effects are obtained.

[0022]

The sealing device of the present invention is suitable for attachment to a large facility from which components can be removed, but can also be applied to a small facility, and in any case, has the above-described effects. is there.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a sealing device according to an embodiment of the present invention.

[Explanation of symbols]

 (1) Electric water pump shaft (2) Drying area (3) Inundation area (4) Fixed part of annular frame (5) Movable part (6) Pump outer wall (7) Plastic member as seal member (8 ) Rubber elastic member (9) Track surface

Claims (7)

(57) [Claims] 1. A device for sealing off a drying zone (2) along a shaft of an electric water pump from a flooded zone (3) so as to seal off the shaft (1). Annular frames (4), (5) for radial sealing of the pump body, said frame being mounted in the annular space between the shaft (1) and the outer wall (6) of the pump body, (6) An outer fixed portion (4) tightly fitted to the inner surface, and an inner movable portion that is firmly and integrally attached to the shaft (1) and has an outer peripheral surface serving as a raceway surface (9). Part (5), the annular frame (4),
The raceway surface (9) held inside the (5) and at the inner peripheral edge
The seal members (7) and (8) slidingly contacting are a plastic member (7) located in the flooded area (3) and a rubber elastic member (8) located in the dry area (3). Lucy
The fixed part (4) of the annular frame is
Inverted U-shape with two flanges (12), (13)
The moving part (5) has two flanges substantially opposed to the flange.
U-shaped with (15) and (16), the latter franc
The free ends of the flanges (15) and (16) are
2), slightly over the free end of (13) outward in the radial direction
While extending, the sealing members (7) and (8)
Plastic member (7) and rubber elastic member (8)
The outer peripheral edge is formed of a metal ring flange (20) and a second support rib.
The fixing portion is sandwiched between the
The respective cylinders of the two rings arranged inside the minute (4)
(19) and (25) are fixed to the inner surface of the portion (4).
Between the inner and outer peripheries of the plastic member (7)
In the configuration where the space is curved toward the flooded area (3)
The rubber elastic member (8) has an inner peripheral edge.
Three lip-shaped ridges (21), (21),
(21) is formed, of which is located in the dry area (3)
The first lip-shaped ridge (21) is wound around the wrapping spring (2).
2) biasing toward the frame movable part (5)
Two unconstrained lip projections
The ridge (21) is pushed toward the first lip-shaped ridge (21).
The plastic member
The inner rim of (7) is also unrestricted to the two-lip ridge (21).
So that it can bend by the internal pressure of the pump.
(7) an intermediate portion and an inner peripheral portion and a rubber elastic member (8);
A cartridge type watertight seal device characterized in that a hydrodynamic seal groove (26) is formed therebetween. 2. A Z-shaped flange (1) on an inundation area side of an outer fixed portion (4) of the annular frames (4) and (5).
2) a dry area side of the straight line Jofu flange (13), which has been formed after the inserted and attached to those the sealing device, the fixed
The outer surface of the cylindrical portion (10) of the portion (4) is vulcanized and cured rubber
Fixed to the main body outer wall (6) via the elastic material layer (11)
Waterproofing seal device according to claim 1 are. 3. A linear flange (1) on an inundation area side of an inner movable portion (5) of the annular frames (4) and (5).
The base of 5) and the drying zone side Z-Katachifu flange (16),
The flanges (12) and (1) of the fixed portion (4) respectively
3) outside the end of the Z-shaped flange (16)
Is located inside the straight flange (13) of the fixed part (4).
And the outer surface of the cylindrical part (10) of the movable part (5).
Is outside the main body through the vulcanized and cured rubber elastic material layer (17).
Waterproofing seal device according to claim 2 which is fixed to the wall (6). 4. A supporting metal ring (19, 20) having an L-shaped cross section, said rubber elastic member (8) serving as said sealing member.
Is pressurized硫焼with the cylindrical portion (19) to the flange (20)
And has water stopping seal device of claim 1. 5. The plastic member (7) as the sealing member, waterproofing seal device according to Monodea Ru請 Motomeko 1 which has been deformed annular plate. 6. A plastic member (7) as the sealing member, waterproofing sealing device according to the poly 4 fluorinated ethylene emissions steel or wear-resistant polyamide der Ru請 Motomeko 5. 7. The track surface (9) and the lip-shaped ridge (2)
1) or Yes to fill the grayed <br/> lease (27) between the flange (16) of the movable part (5), said flange (16)
The rubber elastic material layer (17) extended to near the free end
The part prevents backflow of powder etc. and between the components of the device.
Dike to act as a stopper to control the asobi cost
It is an enlarged part (18), and the flange (16)
A portion of the rubber elastic member (8) opposed to a portion near the free end
Prevents backflow of grease and the like, and
Bulge (23) to regulate asobi cost
Waterproofing seal device according to any one of 請 Motomeko 1-6 that.