JPH0960598A - Mechanical seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably remove foreign matters contained in fluid to be fed to a sliding part, by attaching an annular filter attached to either a fixed cylindrical member or a rotational cylindrical member, and extending toward the other cylindrical member. SOLUTION: A first seal material 3 capable of being moved in the axial direction is mounted on a fixed cylindrical member 2 to be attached to a housing and having the approximately U-shaped section. A second seal material 2 capable of being moved in the axial direction is mounted on a rotational cylindrical member 8 having the approximately U-shaped section facing the fixed cylindrical member 2 at the position facing the first seal member 3. An annular filter 11 attached to either the fixed cylindrical member 2 or the rotational cylindrical member 8, and extending to the other cylindrical member is attached. The annular filter 11 is constituted of a wire mesh of a resin mesh. Therefore, foreign matters can be removed even if the foreign matters are contained in fluid to be supplied into a mechanical seal for the purpose of lubrication and cooling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in mechanical seals related to shaft sealing technology.

[0002]

2. Description of the Related Art As a prior art relating to the present invention, there is, for example, Japanese Utility Model Laid-Open No. 3-17200.

In this prior art, a covering member for covering the sliding portion between the first sealing material and the second sealing material of the mechanical seal of the water pump is attached to the casing, and water in the pump chamber is positively applied to the sliding portion. It is configured not to be pumped. As a result, foreign matter floating in the pump chamber is prevented from being sent to the sliding portion of the first seal material and the second seal material, and water leakage due to foreign matter being caught in the sliding surface of the mechanical seal. This is to prevent the problem of.

[0004]

However, in the structure of the prior art described above, when the amount of water sent to the sliding portion is small, the cooling of the sliding portion is insufficient or the water sent to the sliding portion is insufficient. If the amount is large, a large amount of foreign matter will be sent to the sliding portion, which may cause foreign matter to be caught on the sliding surface.

Therefore, it is a technical object of the present invention to provide a mechanical seal in which the cooling water is spread to the sliding portion and foreign matter can be surely removed from the water sent to the sliding portion.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the measures taken in the invention of claim 1 are fixed to a ring-shaped first seal member and a housing, and hold the first seal member. Fixed to a fixed tubular member having a substantially U-shaped cross section, a ring-shaped second seal member that relatively slides on the same central axis as the first seal member, and a shaft that rotates in the housing, A rotary cylinder member holding a seal material and having a substantially U-shaped cross section facing the fixed cylinder member, and a spring for urging at least one of the first seal material and the second seal material in the rotation axis direction. In the mechanical seal, the foreign matter contained in the fluid sent to the sliding portion is attached by attaching an annular filter attached to one of the fixed tubular member or the rotary tubular member and extending toward the other. It is to indeed removed.

According to a second aspect of the present invention, the annular filter is attached to the rotary cylinder member so that foreign matter contained in the fluid adhering to the annular filter is rotated by the centrifugal force and the fluid flow accompanying the rotation. Can be removed from the.

The means taken in the third aspect of the present invention is such that the end portion of the annular filter has a portion perpendicular to the rotational axis direction, so that foreign matter contained in the fluid adhering to the annular filter is subjected to centrifugal force due to rotation. It can be reliably removed from the annular filter by the fluid flow.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a mechanical seal 1 according to a first embodiment of the present invention. A first seal member 3 which is movable in the axial direction (left and right direction in FIG. 1) is fitted to a fixed tubular member 2 having a substantially U-shaped cross section which is attached to a housing of a pump device or the like. A packing 4 is interposed between the step portion provided on the back surface and the radial portion of the fixed tubular member. Reference numeral 5 is a spring, and reference numerals 6 and 7 are spring retaining rings. The extension of the spring 5 presses the first seal member 3 to the right in the drawing. On the other hand, the rotating tubular member 8 having a substantially U-shaped cross section, which is attached around a rotary shaft such as an impeller of the pump device, has a first movable unit in the axial direction (left and right direction in FIG. 1). The 2 sealing material 9 is fitted in the position which opposes the 1st sealing member 3 via the cushioning rubber 10 of the back surface. A sliding portion is formed between the second sealing material 9 and the first sealing material 3. Reference numeral 11 denotes an annular filter composed of a wire mesh or a resin mesh, which is fixed to the fixing portion 12 of the rotating cylinder member 8. Ring filter 1
The free end (the left step in the figure) of 1 is adjusted to a length that leaves a minute gap with the fixed tubular member 2. The annular filter 11 can also be attached to the fixed cylinder member 2.

FIG. 2 shows the mechanical seal 1 having the above construction.
Shows the structure attached to the water pump.
The fixed tubular member 2 is attached to the housing 13 of the water pump, and the rotary tubular member 8 is fixed to the shaft 15 for rotating the impeller 14 by a drive device (not shown) and the inner peripheral surface of the fixed portion 8a. The space 16 between the housing 13 and the impeller 14 is filled with water controlled by a water pump, and turbulent flow occurs due to the rotation of the impeller 14, causing the annular filter 11 to move as shown by the arrow in FIG. The passing water lubricates and cools the sliding surface between the first seal member 3 and the second seal member 9. The mesh size of the annular filter 11 is determined by the size of the first seal member 3
The size is selected such that foreign matter in the water that would adversely affect the sliding surface between the second sealing material 9 and the second sealing material 9 does not pass through. Further, by rotating the rotating cylinder member 8 integrally with the shaft 15, foreign matter that cannot pass through the annular filter 11 is removed from the annular filter 11 by the centrifugal force due to the rotation of the shaft 15 and the turbulent flow of water in the space 16. This prevents the annular filter 11 from being clogged.

FIG. 3 is a sectional view of the mechanical seal 17 according to the second embodiment of the present invention. The mechanical seal 17 has the same structure as the mechanical seal 1 of the first embodiment of the present invention shown in FIG. 1 and the annular filter 18, and the same members as those in FIG. Description of members will be omitted.

The mechanical seal 17 according to the second embodiment of the present invention is characterized in that the annular filter 18 extends horizontally in the rotational direction 18a and conically extends 18a.
b, 18c extending in the direction perpendicular to the rotation direction.

The arrows in FIG. 3 indicate the fluid flow generated when the fixed cylinder member 8 is attached to the rotating shaft of the water pump or the like.

By constructing the second embodiment in this way, the annular filter 1 is provided at the portion 18a or 18b.
The foreign matter in the water which has been prevented from passing through 8 is moved along the slope of the portion 18b by the centrifugal force generated by the rotation of the shaft 15.
Move to site c. When the foreign matter moves to the bending point of 18b and 18c, it is returned to the water in the pump due to the portion 18c extending in the direction perpendicular to the rotation direction. Especially,
The ring filter 18 extends in the direction perpendicular to the rotational direction 1
By providing 8c, it is possible to prevent foreign matter from entering the inside of the mechanical seal 17 from the free end of the annular filter 18.

[0016]

According to the invention of the above-mentioned claim 1, the annular filter extending toward the other is attached to one of the fixed tubular member and the rotary tubular member, so that the mechanical seal is lubricated and cooled. Even if the supplied fluid contains foreign matter, it can be removed.

According to the second aspect of the present invention, since the annular filter is attached to the rotary tubular member, even if a foreign matter that cannot pass through the mechanical seal adheres to the annular filter, the rotary tubular member including the annular filter. A centrifugal force is generated due to the rotation of the, the foreign matter can be removed from the filter by the centrifugal force, and clogging of the annular filter can be prevented.

According to the third aspect of the present invention, by providing the end portion of the annular filter with a portion perpendicular to the rotation axis direction,
It is possible to reliably remove the foreign matter attached to the annular filter from the filter and prevent the foreign matter from entering the inside of the mechanical seal from the end portion of the annular filter.

[Brief description of drawings]

FIG. 1 is a sectional view of a mechanical seal according to a first embodiment of this invention.

FIG. 2 is a cross-sectional view in which the mechanical seal according to the first embodiment of the present invention is attached to a water pump.

FIG. 3 is a sectional view of a mechanical seal according to a second embodiment of the present invention.

[Explanation of symbols]

 2 ... Fixed tubular member 3 ... First sealing material 8 ... Rotating tubular member 9 ... Second sealing material 11, 18 ... Annular filter 18c ... Vertical part of annular filter

Claims (3)

[Claims] 1. A ring-shaped first seal member, a fixed tubular member fixed to a housing and having a substantially U-shaped cross section for holding the first seal member, and the first seal member having the same central axis as each other. A sliding ring-shaped second seal member, a rotary tubular member fixed to a shaft that rotates in the housing, holding the second seal member, and facing the fixed tubular member and having a substantially U-shaped cross section; A mechanical seal including a spring for urging at least one of the first seal material and the second seal material in a rotation axis direction, the mechanical seal being attached to one of the fixed cylinder member or the rotary cylinder member and directed toward the other. A mechanical seal that is equipped with an annular filter that extends vertically. 2. The mechanical seal according to claim 1, wherein the annular filter is attached to the rotary cylinder member. 3. The mechanical seal according to claim 2, wherein the end portion of the annular filter has a vertical portion with respect to the rotation axis direction.