JPH086819B2 - Cartridge type mechanical seal - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, like a submersible pump,
The present invention relates to a cartridge-type mechanical seal used for a shaft-sealing portion of devices that are driven while being immersed in water (in liquid).

[0002]

2. Description of the Related Art As a mechanical seal used for a shaft sealing portion of a device driven in a state of being immersed in water (liquid), such as a submersible pump, to improve workability of attaching and detaching the shaft sealing portion. The cartridge type mechanical seal thus constructed has already been proposed by the applicant of the present invention (see Japanese Patent Application Laid-Open No. 1-261568). In this cartridge type mechanical seal, as shown in FIG. 3 , the fixed side seal element 20 having a pair of stationary seal rings 20A and 20B that are spaced apart and opposed to each other in the axial direction is a rotary shaft of a shaft-sealed device. 21
Fixed side members 22A, 22B such as housings
A pair of rotary sealing rings that are non-rotatably housed in a cartridge case 23 that is detachably fixed to the above, and are biased by the coil spring 24 toward the stationary sealing rings 20A and 20B to form the sealing portions 25 and 25. 26A, 26
B, and a rotary side seal provided with a pair of cylindrical packings 26C and 26D in which the rotary sealing rings 26A and 26B are fixedly attached.
The cartridge element 23 is rotatably housed in the cartridge case 23. In the cartridge type mechanical seal configured as described above, the cartridge case 23 includes the rotary shaft 21 and the fixed side member 22 of the device to be sealed.
Since the mechanical seal can be attached to and detached from the shaft-sealing portion of the device to be sealed by a simple operation of inserting or withdrawing from A or 22B ,
The attachment / detachment workability is significantly improved.

[0003]

However, as described above,
Of conventional cartridge type mechanical seal with various configurations
Use a pair of tubular packings 26C and 26D.
Each of these cylindrical packings 26C and 26D must be formed with a close contact portion for closely contacting the rotary member with a predetermined axial length, so that the axial direction of the cartridge mechanical seal is increased accordingly. The dimension becomes longer. In addition, for example, the rotary shaft 21 is fitted with tubular packings 26C and 26D.
If you try to press it directly into the box to make it adhere , the cylindrical packing 2
Since a large press-fitting resistance is generated due to the frictional force between the contact portions of 6C and 26D and the rotary shaft 21 at two places ,
It is very difficult to adopt a press-fitting type attachment means
It Therefore, the cartridge case 23 is attached to the outer cylinder 23.
Three members: A, inner cylinder 23B, and cap 23C
The cartridge case 23 is divided into
Insert into the rotary shaft 21 and the fixed side members 22A, 22B.
Before inserting the tubular packings 26C and 26 into the inner tube 23B in advance.
D is press-fitted so that the close contact portions are in close contact with the inner cylinder 23B. Thus, like the conventional cartridge type mechanical seal, a pair of cylindrical packings 26C,
In the configuration using 26D, the axial dimension becomes long, the mechanical seal becomes large, and the rotary shaft 2
1 and fixed side members 22A, 22B
Cartridge case 2 with inner cylinder 23B for ease of use
3 is necessary next use of, and therefore, in the number of parts
Structure becomes complicated, when it comes to increasing the cost
Both have a lot of assembly man-hours, so we decided to use a cartridge type.
The effect of improving the workability of attachment and detachment was not sufficient.

The present invention has been made in view of the above circumstances.
It is possible to reduce the size of the mechanical seal as a whole.
At the same time, while reducing the number of parts and the number of assembly steps,
A cart that can significantly improve the workability of attaching and detaching.
For the purpose of providing a ridge type mechanical seal
I have.

[0005]

[Means for Solving the Problems] To achieve the above object
In addition, the cartridge type mechanical seal according to the present invention,
A stationary seal element having a stationary seal ring is non-rotatably housed in a cartridge case of which both ends in the axial direction are detachably fixed to a stationary member of a device to be sealed, and a compression plate
A rotary seal ring to form a seal is biased to said stationary seal ring side by the roots, the axial direction end portions of the rotary seal ring
The rotation-side seal element, which is tightly fixed to the inner circumference of the holding portion formed on the outer peripheral side and has one tubular packing that is closely fitted to the rotation shaft of the shaft-sealing device so as to be insertable and removable, and characterized in that it is capable housed in the cartridge case
To do.

[0006]

According to the present invention, the axial direction of one cylindrical packing of the rotary side seal element housed in the cartridge case.
Since the rotary seal rings are fixed tightly on both ends, the axial direction
While forming a pair of sealing parts on the
Only one contact part between the kin and the rotating shaft is required, and each time
The rolling seal ring is pressed as an elastic body that presses and urges it toward the stationary seal ring.
By using a leaf spring, the space between the tubular packing and the rotating shaft
It is possible to shorten the axial length of the close contact part. This
As a result, when pressing the tubular packing directly into the rotary shaft,
Press-fit resistance and pull-out resistance when pulling out from the rotary shaft are in the axial direction
Reduced only by the frictional force between the rotating shaft and one short contact part
Even if the inner cylinder is not used, it can be attached to the shaft-sealing part of the device to be shaft-sealed.
Attaching and detaching the entire cartridge type mechanical seal
It can be done easily.

Further, the use of a single tubular gasket
By using a compression plate with a small axial dimension ,
Compared with the conventional cartridge-type mechanical seal that uses two cylindrical packings and a coil spring , the axial dimension can be significantly shortened and the size can be reduced .

Further, as described above, a single tubular packing is used.
The inner cylinder for easy mounting and dismounting.
By eliminating the need for parts, the number of parts can be reduced, the structure can be simplified, and the number of assembly steps can be reduced.
it can.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an embodiment of the present invention. In this figure, a cartridge type mechanical seal 1 is a cartridge case which is detachably fixed to fixed side members (for example, housings) 2 and 2 of a shaft-sealed device which is driven while being immersed in water, such as a submersible pump. 3, a fixed side seal element 4 housed in the cartridge case 3, a rotary side seal element 5, and a compression leaf spring 6.
It has and. The cartridge case 3 includes a case main body 30 made of a non-rusting metal plate such as a pressed stainless steel plate, and an annular retainer 31. The case body 30 is provided with a flange portion 30B that extends radially inward at one axial end of the cylindrical body portion 30A, and a flange portion 30C that greatly extends outwardly in the radial direction at the other axial end of the cylindrical body portion 30A. The structure is such that the lubricant introduction port 30a is formed so as to penetrate therethrough, and the annular retainer 31 is detachably press-fitted and fixed to the other axial end of the body portion 30A. The fixed-side seal element 4 includes a pair of stationary seal rings 41, 41 that are spaced apart in the axial direction and face each other, and an annular packing 4 that holds the stationary seal rings 41, 41 in a non-rotatable manner.
2, 42.

The stationary seal rings 41, 41 are molded from a hard material such as ceramics, and have ring packings 42,
42 is made of an elastic material such as hard rubber having a relatively high strength and excellent water sealing property (liquid sealing property), and one (upper) annular packing 42 is an inner surface of the flange portion 30B of the case body 30. In the state of being pressed against, the inner peripheral surface of the body portion 30A is non-rotatably closely held, and the other (lower) annular packing 42 is non-rotatably closely held by the annular retainer 31.

The rotary side seal element 5 tightly fixes the pair of rotary sealing rings 51, 51 and the rotary sealing rings 51, 51 together, and at the shaft sealing portion 8 of the rotary shaft 7 of the shaft-sealed equipment. It is configured by a single cylindrical packing 52 that is externally fitted so as to be detachable. The rotary seal rings 51, 51 are made of a softer material than a stationary seal ring such as carbon, and the tubular packing 52 has relatively high strength such as hard rubber and excellent water sealing property. Is formed of an elastic material, and is formed at both axial ends of the tubular packing 52.
The rotary sealing rings 51, 51 are provided on the inner circumferences of the holding portions 52A, 52A.
Are held in close contact with each other, and the base 52B at the center in the axial direction and both ends in the axial direction are
The holding portions 52A and 52A are continuous with each other via neck portions 52C and 52C that allow expansion and contraction in the axial direction. Holding part 5
The drive cases 53, 53 made of a non-rusting metal plate such as stainless steel are attached to the outer circumferences of the 2A, 52A by integral molding, so that the rotary seal rings 51, 51 are held tightly by the holding portions 52A, 52A. By increasing the force, and by winding the outer periphery of the base portion 52B around the drive ring 54 made of a non-rusting metal plate such as a stainless steel plate, the adhesion force of the base portion 52B to the rotating shaft 7 is increased.

The compression leaf spring 6 is formed by laminating a plurality of leaf springs made of non-rusting metal such as stainless steel, and is interposed between the drive cases 53, 53 to hold the tubular packing 52 in the holding portion 52A. 52A are urged in directions away from each other. Therefore, the sealing end faces of the rotary sealing rings 51, 51 are pressed against the sealing end faces of the stationary sealing rings 41, 41, and the sealing portions 9 , 1, 9
To form. In addition, 10 and 10 show O-rings.

Cartridge type mechanic having such a structure
In the case of a lu seal, the case body 30 of the cartridge case 3 is inserted into the fixed side members 2 and 2 of the shaft-sealed device while press-fitting the rotary shaft 7 into the tubular packing 52, and then a plurality of bolts (illustrated example) in by fastening only the flange portion 30C of the lower to the fixed-side member 2 by in which) 11 shows one volt, the cartridge-type mechanical seal 1 briefly against the shaft sealing portion 8 of Hijikufu equipment Can be installed. In particular, by using the single tubular packing 52, only the axially central base portion 52B having a predetermined axial length is brought into close contact with the rotary shaft 7. Also, the sealing end faces of the rotary sealing rings 51, 51 are stationary.
Energize so as to make pressure contact with the sealing end faces of the sealing rings 41, 14.
A compression leaf spring 6 having a small axial dimension is used as an elastic body.
As a result, the cylindrical packing 52 that comes into close contact with the rotary shaft 7
It is also possible to shorten the axial length of the base portion 52B.
In other words, the number of contact parts is reduced to one and the axial length
Runode also shorter and requires two contact portions, Koirusupu
Compared with the conventional cartridge-type mechanical seal that uses a ring , the axial dimension can be greatly reduced, and the cartridge-type mechanical seal 1 can be downsized.

Further, the press-fitting resistance when the rotary shaft 7 is directly press-fitted into the cylindrical packing 52 is reduced only by the frictional force between the rotary shaft 7 and the base 52B at the axial center, so that the mechanical seal 1 of the cartridge type is sealed. Easy to put on. therefore
To, from the inner cylinder has been used in conventional cartridge type mechanical seal can be omitted, it is possible to achieve much reduced number of parts becomes structure easily such Rutotomoni, the <br/> reduce assembly steps.

On the other hand, after removing the plurality of bolts 11 to release the fastening of the flange portion 30C to the fixed side member 2, the case body 30 of the cartridge case 3 is accompanied by the work of pulling out from the fixed side members 2 and 2. Tubular packing 52
The cartridge type mechanical seal 1 can be removed from the shaft sealing portion 8 by pulling out the rotary shaft 7 from the rotary shaft 7. In this case, the pull-out resistance is also reduced only by the frictional force between the rotating shaft 7 and the base 52B at the axial center of the tubular packing 52 .
It can be easily removed.

[0016] In the above embodiment, it is assumed that the cartridge case 3 by the one formed by Hihatsusabi metal plate such as stamped stainless steel plates, as shown in FIG. 2, resin cartridge The case 3 may be used. 2, the embodiment identical or corresponding parts in FIG. 1 are denoted by the same reference numerals, the description thereof is omitted.

[0017]

As described above, according to the present invention, a single cylindrical packing is used and the rotary seal ring is stationary.
As an elastic body that urges the sealing ring side, pressure with a small axial dimension
By using a contracted leaf spring, the axial dimension of the cartridge case can be significantly shortened to reduce the size of the mechanical seal as a whole , and the cylindrical packing can be relatively displaced in the circumferential direction as in the conventional case. No inconvenience that adversely affects the sealing performance of the sealing portion occurs. Moreover, pull-out resistance when pulling out the press-in resistance and the tubular packing in the case of press-fitting directly the rotation axis to the cylindrical packing from the rotation axis, the axial direction
Since the frictional force between the rotating shaft and one contact part with a short direction length is reduced, the shaft seal of the shaft-sealed equipment can be performed without using the inner cylinder.
Attachment / detachment of the entire cartridge type mechanical seal
Work can be performed easily. In addition, a single tubular
Inner tube for easy use and easy attachment / detachment
By the fact that Habukeru the use of, in conjunction with the structure can be simplified number of parts becomes small, achieving a reduction in assembly steps
There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is a half cross-sectional view of a conventional example.

[Explanation of symbols]

1 cartridge type mechanical seal 2 fixed side member 3 cartridge case 4 fixed side sealing element 5 rotating side sealing element 6 compression leaf spring 7 rotating shaft 9 sealing part 41 stationary sealing ring 51 rotating sealing ring 52 tubular packing

Claims (1)

[Claims] 1. A fixed-side seal element having a stationary seal ring is non-rotatably housed in a cartridge case of an axially both-ends opening type which is detachably fixed to a fixed-side member of an equipment to be sealed and is compressed. A rotary seal ring which is urged toward the stationary seal ring side by a leaf spring to form a seal portion, and the rotary seal ring.
A rotation-side sheath that is tightly fixed to the inner circumference of a holding portion formed at both ends in the axial direction and has one cylindrical packing that is tightly fitted to the rotation shaft of the shaft-sealed device so as to be insertable and removable. A cartridge-type mechanical seal, wherein the cartridge element is rotatably housed in the cartridge case.