JPH083762Y2 - mechanical seal - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical seal which is preferably used as a shaft sealing device for a rotary device mainly treating liquid such as a water supply pump.

[0002]

2. Description of the Related Art FIG. 3 is a vertical cross-sectional view showing a shaft sealing device in a water supply pump to which a conventional mechanical seal of this type is applied. In FIG. 3, 1 is a stationary casing and 2 is a casing. 1 is a rotary shaft that is a rotary side that penetrates through and a mechanical seal having the following configuration is arranged between the outer peripheral surface of the rotary shaft 2 and the inner peripheral surface of the casing 1.

On the circumferential surface of the rotary shaft 2 on the pump chamber side,
The stopper ring 3 is fixed so as to rotate integrally with the rotary shaft 2 via the set screw 4 and the O-ring 5 and is sealed in a state where the outer peripheral surface of the rotary shaft 2 is sealed, and the stopper ring 3 A seal ring retainer 7 is fitted around the outer circumference of the seal ring with an O-ring 6 sealing the two.
A rotary seal ring 8 having a sharp edged sealing end portion 8a is fixed to the end surface of the shaft sealing side of the rotary shaft 8 and rotates integrally with the rotary shaft 2.

On the other hand, on the outer end side of the casing 1, a flange member 9 having a cooling liquid inlet 9a and a cooling liquid outlet 9b is fitted and continuously provided on the outer periphery of the rotary shaft 2, and this flange is provided. The O-ring 1 is formed on the inner peripheral surface of the member 9 between them.
The adapter ring 11 is attached in a state of being sealed by 0. A seal ring retainer 13 supported by the adapter ring 11 via a metal forming bellows 12.
A stationary seal ring 14 having a smooth sealing end face 14a with which the cutting edge-shaped sealing end 8a of the rotary seal ring 8 is slidably contacted is fixed to.

A baffle plate 15 whose tip reaches the vicinity of the inner surface of the stationary seal ring 14 is fixed to the adapter ring 11 via a screw member 16 such as a screw. At the outer peripheral portion, a coil spring 17 as a spring member is interposed between the adapter ring 11 and the seal ring retainer 13 to urge the stationary seal ring 14 to move toward the rotary seal ring 8 side. , Still
The smooth sealing end surface 14a of the stop seal ring 14 is rotationally sealed.
The ring- shaped sealing end 8a of the ring 8 is elastically pressed to seal the sealing fluid.

[0006]

In the conventional mechanical seal having the above-mentioned structure, the rotating side parts such as the rotating seal ring 8 and the seal ring retainer 7 and the stationary side parts such as the stationary seal ring 14 and the coil spring 17 are used. It is necessary to incorporate all the components for the mechanical seal into a relatively narrow annular space formed between the outer peripheral surface of the rotary shaft 2 and the inner peripheral surface of the casing 1 in a predetermined order. Therefore, there is a problem that a great deal of labor and time are required for the assembling work. Moreover, it is necessary to adjust the mounting position, inclination, etc. for each part and proceed with the assembling work while checking, which makes workability extremely difficult for proper and accurate assembling. However, there is a problem that it is difficult to obtain an assembled state in which a predetermined sealing function can be stably exhibited.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is a highly accurate assembly capable of reliably and stably exhibiting a predetermined sealing function by simply adding simple constituent parts. It is an object of the present invention to provide a mechanical seal that can be easily attached.

[0008]

In order to achieve the above object, a mechanical seal according to the present invention is arranged between a casing and a stepless straight rotary shaft that penetrates the casing, and is in sliding contact with each other. A rotating seal ring and a stationary seal ring for sealing a sealing fluid, and urging the sealing end face of one of the seal rings to elastically press the sealing end face of the other seal ring.
It comprises a metal bellows and spring member, the upper
On the flange that can be fixed to the casing side, the static seal
Integral stationary part including the ring and spring member
Of the rotary seal ring and
And at least one of the static seal rings
In a mechanical seal having a sealed end , a sleeve formed by integrally forming a portion projecting outward from a flange that can be fixed to the casing side is inserted into the rotary shaft, and the inner end of the sleeve is inserted. A circular set plate mounted on the flange on the protruding portion while fixing and holding the rotary side component including the rotary seal ring on the side of the section.
Has a notch groove for positioning the rotating side parts by
One is that mounted integrally rotatable fixture for fixing against the sleeve rotary shaft.

[0009]

According to the present invention, the rotation-side part including a rotating seal ring which constitute the mechanical seal is fixed held together in a sleeve which is fitted to the rotary shaft, they have a cartridge Runode, the rotation-side Insert the cartridge of parts into the rotary shaft, and then hold the stationary parts together.
Fix the flange on the casing side and
Use the circular set plate mounted on the flange to
The position and inclination of each component can be individually adjusted before assembly by a simple operation of simply engaging the notch formed on the protruding portion of the groove.
Even if you do not adjust the
Prevent the stop side and rotating side parts from being properly assembled.
Thus, it is possible to easily and accurately incorporate a mechanical seal that exhibits a predetermined sealing function.

Further, since at least one of the rotating and stationary seal rings which are in sliding contact with each other to seal the sealing fluid is used as a blade-shaped sealing end portion , it is suitable for sealing a solidifying hardly sealing fluid such as latex. Is.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a shaft sealing device in a water supply pump to which a mechanical seal according to an embodiment of the present invention is applied. In FIG. 1, 1, 2, 7-9, 12-15
Since and 17 are the same parts as the conventional example shown in FIG. 3,
Corresponding parts are designated by the same reference numerals and their description is omitted.

In FIG. 1, reference numeral 18 denotes a sleeve inserted into the rotary shaft 2. A large diameter portion 18a is integrally formed on the inner end side of the sleeve 18, and the large diameter portion 18 is formed.
A seal ring retainer 7 is fixed to a through a set screw 20 in a state of being sealed by an O-ring 19, and a sharp edged sealing end portion 8a is provided on an end face of the seal ring retainer 7 on the shaft sealing side. The rotary seal ring 8 is fixed.

On the outer end side of the sleeve 18,
A portion 18b projecting outward from the flange member 9 which can be fitted and fixed to the casing 1 is integrally formed, and the sleeve 18 is integrally rotatably fixed to the rotary shaft 2 at the projecting portion 18b. A set screw 21 is screwed as a fixture. As described above, the rotation side cartridge A including the combination of the rotation side components such as the rotation seal ring 8 and the seal ring retainer 7 and the sleeve 18 is configured.

On the other hand, the cooling liquid inlet 9a and the cooling liquid outlet 9
b having the casing 1 on the outer periphery of the rotary shaft 2
A carbon bush 23 is fixed to the inner peripheral surface of the flange member 9 which can be fitted and fixed to the outer end side of the flange member while being sealed by an O-ring 22. To the seal ring retainer 13 supported on the inner surface side of the member 9 via the metal forming bellows 12,
Stationary seal ring 1 having a smooth sealing end face 14a with which the cutting edge-shaped sealing end 8a of the rotary seal ring 8 is in sliding contact.
4 is fixed.

A baffle plate 15 is fixed to the flange member 9 so that its tip reaches near the inner surface of the stationary seal ring 14, and the outer peripheral portion of the baffle plate 15 is connected to the flange member 9. Between the seal ring retainer 13 and the metal ring bellows 12 as a spring member and the coil spring 1.
7, the stationary seal ring 14 is urged to move toward the rotary seal ring 8 side, whereby the smooth sealing end face 14a is elastically pressed against the cutting edge-shaped sealing end 8a to seal the sealing fluid. I am configuring. As described above, the stationary seal ring 14, the seal ring retainer 13, the metal
A stationary cartridge B is constituted by stationary members such as the molded bellows 12, the coil spring 17, the baffle plate 15 and the flange member 9.

As shown in FIG. 2, circular set plates 24 are provided on the outer surface of the flange member 9 and at positions where they face each other in the radial direction of the sleeve 18, respectively, as shown in FIG. Attached bolt 2
It is attached rotatably around the axis of the bolt via 5. These circular set plates 24 are rotated by 180 ° from the position shown by the phantom line in FIG. 2 to the position shown by the solid line in FIG. 2, and the inner surface thereof contacts the outer surface of the bush 23 which is one component of the stationary side cartridge B. While contacting with each other, a part of the outer peripheral edge 24a is engaged with a notch groove 18c formed in a part of the outer peripheral surface of the sleeve 18 to rotate.
The side parts are positioned to prevent both cartridges A and B from being properly assembled.

In the shaft sealing device having the above structure,
Assembling accuracy can be improved by attaching rotating side parts such as the rotary seal ring 8 among the parts constituting the mechanical seal to the sleeve 18 at a predetermined position and a tilted posture before being inserted into the rotary shaft 2. While the rotating side cartridge A can be constructed with good performance, the stationary seal ring 1
By mounting the stationary side parts such as 4 at the predetermined position and the inclined posture with respect to the flange member 9 before being fitted and fixed to the casing 1, the stationary side cartridge B having a high assembling accuracy is configured. be able to.

Next, the sleeve 18 is fitted onto the rotary shaft 2 from the outside, and the sleeve 18 is fixed to the rotary shaft 2 via the set screw 21 to assemble the rotary cartridge A. Subsequently, the flange member 9 is fitted and fixed to the outer end side of the casing 1, and in this state, the circular set plate 24 is changed from the posture shown by the phantom line in FIG. 2 to the posture shown by the solid line in FIG. The stationary side is rotated by bringing the inner surface into contact with the outer surface of the bush 23 of the stationary side cartridge B and engaging a part 24a of the outer peripheral edge thereof with the notch groove 18c on the outer peripheral surface of the sleeve 18. Install the cartridge B. As a result, the cartridges A and B are prevented from being pulled out in the properly assembled state, and the blade-shaped sealing end portion 8a of the rotary seal ring 8 is elastically slidably contacted with the smooth sealing end surface 14a of the stationary seal ring 14 for sealing. A predetermined mechanical seal for sealing the fluid can be easily and highly accurately incorporated.

[0019] As the blade-like sealing end portion 8a of the rotary seal ring 8, to seal the coagulating fluid such as latex which is flame sealed fluid, the end face width is less than 1 mm, particularly about 0.5mm It is preferable to set.

Further, in the above embodiment, as the constituent material of each of the rotating and stationary seal rings 8 and 14, WC is used.
It is possible to arbitrarily select from a cemented carbide mainly composed of, carbon and ceramics and use them in combination. Further, as ceramics, carbide-based ceramics such as SiC, TiC, and BuC, Al ₂ O ₃ , Cr ₂ O ₃ , TiO ₂ ,
Oxide ceramics such as ZrO ₂ , Si ₃ N ₄ , B
Nitride ceramics such as N and TiN, TiB ₂ and Zn
It may be any boride-based ceramic such as B ₂ .

Further, the areas and shapes of the sliding contact surfaces of the both seal rings 8 and 14 are not limited to those in the above-mentioned embodiment, and may have any area and shape.

[0022]

As described above, according to the invention] According to the present devised, by fixedly held together in a sleeve which is fitted to the rotary shaft of the rotary side component including a rotating seal ring which constitute the mechanical seal, they cartridge It is becoming static and the stationary side
Parts are also integrally held on the flange side that can be fixed to the casing.
Since it is held and made into a cartridge , the rotating shaft
When you insert the sleeve that makes the parts into a cartridge
Also, a flange that makes the stationary part into a cartridge
Fix it to the casing and cut out the circular set plate.
A mechanical seal exhibiting a predetermined sealing function can be easily incorporated by simply performing a simple operation such as engaging the groove . Moreover, the parts on the rotating side should be
Preliminary stationary side every time it is not necessary to adjust the position and tilt of the parts, it is possible to previously accurately set the position or inclination of each part in the pre-integration stage, with high accuracy, the desired sealing performance It is possible to obtain an excellent mechanical seal . In addition, the rotation and sliding contact with each other to seal the sealing fluid.
And / or stationary seal ring at the cutting edge
Since it is on the edge, it is difficult to coagulate like latex.
It is also suitable for sealing fluids and can be used for wider applications.
It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a shaft sealing device in a water supply pump to which a mechanical seal according to an embodiment of the present invention is applied.

FIG. 2 is an arrow view from the X direction in FIG.

FIG. 3 is a vertical cross-sectional view showing a shaft sealing device in a water supply pump to which a conventional mechanical seal is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 2 Rotating shaft 8 Rotating seal ring 8a Sealing end 9 Flange member 14 Stationary seal ring 14a Sealing end face 17 Coil spring (spring member) 18 Sleeve 18b Projecting portion 18c Notch groove 21 Set screw (fixture) 24 Circular set plate A Rotating side cartridge B Stationary side cartridge

Claims (1)

[Scope of utility model registration request] 1. A casing and a penetrating the casing
A rotary seal ring and a stationary seal ring, which are arranged between a straight rotary shaft without steps and which are in sliding contact with each other to seal the sealing fluid, and a sealing end face of one of these seal rings and the other seal ring. A metal bellows and a spring member for biasing the sealed end surface of the
Becomes, the fixable flange on the casing side, the stationary sheet
The stationary part including the ring and spring
It is physically held, and the rotary seal ring and stationary seal ring
In a mechanical seal, at least one of which has a blade-shaped sealed end , a sleeve formed by integrally forming a portion protruding outward from a flange that can be fixed to the casing side on the rotary shaft. The sleeve is configured such that the rotary side component including the rotary seal ring is fixed and held on the inner end side of the sleeve, and the circular set attached to the flange is attached to the protruding portion.
The plate has a notch groove for positioning the rotating parts.
A, and a mechanical seal, characterized in that attaching the fixture to fix integrally rotatably to the sleeve with respect to the rotation axis.