JPH051775A - Mechanical seal structure - Google Patents

Abstract

PURPOSE:To provide a mechanical seal structure which performs smooth sealing function by lubrication of larbicant reaching a slide contact portion. CONSTITUTION:A mechancial seal lubrication member 24 is porovide to form a part of the first passage 25 which is supported to a stationary member 14 to supply lubricant radially inward to a contact area between the slide contact portion 20a of a cylindrical member 20 and a slide contact member 16 and the second passage 24d which serves to discharge the lubricant without contacting a rotation portion 13. This ensures that the lubricant is discharged thorugh the second passage 24d which serves for discharge without contacting the rotation portion 13 and that the lubricant reaches the slide portion of a mechanical seal structure through the first passage 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical seal structure which performs a sealing action by sliding contact between members having high hardness.

[0002]

2. Description of the Related Art As a conventional mechanical seal structure,
For example, there is one as shown in FIG. In the mechanical seal structure shown in the figure, a ring member 2 is provided in contact with the step portion 1a of the rotary shaft 1, and the ring member 2 is pressed and fixed to the step portion 1a of the rotary shaft 1 by a sleeve 3. . A stationary member 4 provided on the fixed side is arranged around the rotary shaft 1, and a slider 6 is arranged on the right side of the stationary member 4 in the drawing. Notch 6 of slider 6
Although the rotation of the slider 6 is restricted by engaging the protrusion 4a of the stationary member 4 with a, the slider 6 can move relative to the stationary member 4 in the axial direction. A sliding contact portion 6b is formed so as to project from an end portion of the slider 6 opposite to the cutout 6a. The sliding contact portion 6b is interposed between the stationary member 4 and the slider 6 and is shown in the drawing. The sliding contact surface 2 of the ring member 2 is pushed by the elastic force of the spring.
It is in contact with a. An oil reservoir 8 filled with lubricating oil is defined between the rotary shaft 1 and the other member 7 on the left side of the stationary member 4 in the figure. A seal member 9 is interposed between the stationary member 4 and the slider 6 so that oil from the oil sump 8 does not leak to the outside. The ring member 2 and the slider 6 are made of a material having a relatively high hardness. In such a structure, when the rotary shaft 1 rotates, the ring member 2 also integrally rotates, and the slider 6 pressed against the ring member 2 by the elastic force of the spring is restricted in rotation, so that the slider 6 is rotated. The sliding contact portion 6b comes into contact with the sliding contact surface 2a of the rotating ring member 2 and slides, and the contact between the sliding contact portion 6b and the sliding contact surface 2a at this time causes the sliding contact portion 6b to be radially inward. And the outer side of the radius are sealed to form a so-called mechanical seal structure.

[0003]

However, in such a conventional mechanical seal structure, as shown by the arrow in FIG. 11, the lubricating oil in the oil sump 8 is between the stationary member 4 and the rotary shaft 1. Is expected to flow between the slider 6 and the rotary shaft 1 and finally enter between the sliding contact portion 6b and the sliding contact surface 2a for lubrication. Since the passage of the lubricating oil from 8 to the ring member 2 has a dead-stop structure, the lubricating oil does not flow smoothly, and especially the rotating shaft 1
Is rotating at a high speed, it is more difficult to flow due to the centrifugal force of the lubricating oil circling around the rotary shaft 1. Therefore, the sliding contact portion 6
Lubrication between b and the sliding contact surface 2a may not be performed smoothly, and seizure may occur. Then, this invention makes it a subject to solve the said problem.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to a rotating member having a sliding contact surface extending in a direction perpendicular to the rotation axis, and a stationary member whose rotation is restricted in the axial direction. In a mechanical seal structure having a sliding contact member that is movably supported and is pressed against the rotating member side and slidingly contacts the sliding contact surface, the mechanical seal structure is supported by the stationary member, and the sliding contact surface and the sliding contact member are A mechanical seal lubricating member is provided which forms a part of the first passage for supplying the lubricant inward of the sliding contact portion and a second passage for discharging the lubricant in a non-contact state with the rotating portion. It is configured.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing a first embodiment of a mechanical seal structure according to the present invention. In FIG. 1, a sleeve 13 is fitted on the rotary shaft 11, and the sleeve 13 is fixed by being sandwiched between a ring member 12 tightened on a screw portion 11a of the rotary shaft 11 and a member (not shown). It is designed to rotate together with 11.
A flange portion 13a is formed at an end portion of the sleeve 13 that is in contact with the ring member 12, and a cylindrical member 20 (rotating member) whose rotation is restricted by a pin 15 is provided on the flange portion 13a.

The stationary member 14 is fixed to the other member 17 of the fixing portion with a screw 21, and a passage 18 through which lubricating oil (lubricant) from the other member 17 side passes is provided within the thickness of the stationary member 14. Are formed. A slider 16 (sliding contact member) is arranged on the inner diameter side of the stationary member 14 on the right side in the drawing,
A seal member 19 is provided between the stationary member 14 and the slider 16.
Is installed.

The stationary member 1 is provided in the notch 16a of the slider 16.
By engaging the protrusions 14a of No. 4 with the slider 16
Although its rotation is restricted, the slider 16 can move relative to the stationary member 14 in the axial direction.
The right end surface of the slider 16 in the drawing is pressed by the elastic force of a spring (not shown) interposed between the stationary member 14 and the slider 16, and is in contact with the sliding contact surface 20a of the cylindrical member 20. . The slider 16 and the cylindrical member 20 are made of a material having a relatively high hardness.

Below the stationary member 14 in the drawing, a cylindrical mechanical seal lubricating member 24 with a flange is provided with a screw 22.
Is provided. As shown in FIG. 2, the single mechanical seal lubricating member 24 has a flange portion 24a and a cylindrical portion 24b, and the flange portion 24a has a hole 2 for the screw 22.
4c is opened, and a return passage 24d (second passage) is formed in the meat portion of the cylindrical portion 24b. Further, the right end portion of the return passage 24d in FIG. A folding hole 24e communicating with the opening is formed.
The inner flange side of the cylindrical portion 24b is shown in FIG.
An annular edge portion 24h is formed so as to project to the left in the figure from 4a. The outer peripheral surface of the cylindrical portion 24b of the mechanical seal lubricating member 24 is slightly smaller in diameter than the inner peripheral surfaces of the stationary member 14 and the slider 16, and therefore, as shown in FIG. A gap 25 (first passage) is formed between the stationary member 14 and the inner peripheral surface of the slider 16.

Next, the operation will be described. In such a structure, when the rotating shaft 11 rotates, the cylindrical member 20
Also rotates integrally, and the slider 16 pressed against the cylindrical member 20 by the elastic force of the spring is restricted in rotation. Therefore, the right end surface of the slider 16 in the drawing is the rotating cylindrical member 20. The sliding contact surface 20a contacts and slides, and the sliding contact surface 20 of the end surface of the slider 16 and the cylindrical member 20 at this time.
By the contact with a, the sealing action between the inside of the radius and the outside of the radius of the cylindrical member 20 is performed. Then, as indicated by an arrow in FIG. 3, the lubricating oil sent through the passage 18 is supplied to the stationary member 14 and the cylindrical portion 24 of the mechanical seal lubricating member 24.
It flows through the gap 25 with b, enters the turn-back hole 24e, turns back, and flows toward the discharge portion on the left side in the figure through the return passage 24d.

Lubricating oil flowing through such a path is provided on the end surface of the slider 16 and the cylindrical member 20 in the vicinity of the return hole 24e.
It is possible to infiltrate between the sliding contact surface 20a and the sliding contact surface 20a, and to reliably lubricate between the two so as to perform a smooth sealing action. At this time, since the stationary member 14 and the slider 16 are sealed by the seal member 19, the stationary member 14 and the slider 1 are sealed.
Lubricating oil does not leak to the outside from between 6 and. 2B, the left end of the return passage 24d in the drawing is on the right side of the left end of the edge 24h in the drawing, and the folding hole 24e is a cylindrical portion 24.
Since it is on the left side of the right end in the figure of b, it is not affected by the centrifugal force of the lubricating oil circling around the sleeve 13.

FIG. 4 is a view showing a mechanical seal lubricating member according to a second embodiment of the mechanical seal structure according to the present invention. Mechanical seal lubricating member 24 of this embodiment
Has a structure in which an annular cutout portion 24f that opens to the outer diameter side of the right end portion of the cylindrical portion 24b in the drawing is formed, and the return passage 24d communicates with this cutout portion 24f. FIG. 5 is a view showing a mechanical seal lubricating member according to a third embodiment of the mechanical seal structure according to the present invention. In the mechanical seal lubricating member 24 of this embodiment, a step portion 24g is formed on the outer diameter side of the cylindrical portion 24b so as to be drawn to the left side of the right end in the drawing, and a return passage 24d is opened at the end surface of the step portion 24g. It has a structure like this.

FIG. 6 is a view showing a mechanical seal lubricating member 34 according to a fourth embodiment of the mechanical seal structure according to the present invention. In the mechanical seal lubrication member 34 of this embodiment, a cylindrical inner diameter side member 34f is fitted to an outer diameter side member 34c composed of a large flange portion 34a and an outer diameter side cylindrical portion 34b, and an outer diameter of the inner diameter side member 34f. The return passage 34h is formed so as to extend in the axial direction toward the side and be a dead end at the right end in FIG. 6 (b). A return hole 34g communicating with the return passage 34h is opened at the right end of the outer diameter side cylindrical portion 34b in FIG. 6B. In such a mechanical seal lubrication member 34, the lubricating oil that has entered the return hole 34g from the gap 25 returns to the return passage 3
It is discharged to the discharge part through 4h.

FIG. 7 is a view showing a mechanical seal lubricating member according to a fifth embodiment of the mechanical seal structure according to the present invention. The mechanical seal lubricating member 34 of this embodiment
Is a cylindrical step that is longer than the outer diameter side member 34c and has the same length as the outer diameter side member 34c by retracting from both ends in the outer diameter side member 34c composed of the large flange portion 34a and the outer diameter side cylindrical portion 34b. The parts 34i and 34j are formed, and these step parts 34 are formed.
A groove opening to the outer diameter side is provided between i and 34j, and a return passage 34h is formed between the i and 34j and the outer diameter side member 34c.

FIG. 8 is a view showing a mechanical seal lubricating member according to a sixth embodiment of the mechanical seal structure according to the present invention. While the return passage 34h of the inner diameter side member 34f in FIG. 7 extends linearly in the axial direction, in the mechanical seal lubricating member of this embodiment, the return passage 34h of the inner diameter side member 34f is formed in a spiral shape. It is a thing. Figure 9
FIG. 8 is a diagram showing a seventh embodiment of the mechanical seal structure according to the present invention. In this embodiment, the left end position in the drawing of the folding hole 44b opened to the outer diameter side of the right end in the drawing of the cylindrical part 44a of the mechanical seal lubrication member 44 is the sliding contact surface of the cylindrical member 20 in contact with the slider 16. It is configured to be located on the right side by a predetermined amount D in the left-right direction in the drawing with respect to the position of 20a.

According to the mechanical seal structure having such a structure, when the device is used by rotating it by 90 ° so that the cylindrical member 20 is located above the slider 16, the lubricating oil supplied from the horizontal passage 18 is used. Flows up through the gap 25, rises above the height of the sliding contact surface 20a, and then enters the return hole 44b and is discharged. Therefore, the lubricating oil always enters between the slider 16 and the cylindrical member 20. As a result, both can be reliably lubricated and a smooth sealing action can be performed. If the folding hole 44b is located at the left end in the figure, the sliding contact surface 20a
When it is located on the left side of the figure from the position of, the lubricating oil that rises in the gap 25 does not rise to the height of the sliding contact surface 20a when the device is used by rotating 90 ° as described above. Since it enters the return hole 44b, the slider 16
This is because the lubricating oil cannot be reliably supplied between the cylindrical member 20 and the cylindrical member 20.

[0016]

As described above, according to the present invention, the lubricating oil can be reliably supplied to the sliding contact portion of the mechanical seal structure, the smooth sealing action can be achieved, and the seizure between the sliding contact members can be achieved. Can be prevented.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a first embodiment of a mechanical seal structure according to the present invention.

FIG. 2 is a half front view and a half side sectional view of the mechanical seal lubricating member 24 shown in FIG.

3 is an enlarged view of a main part showing a flow of lubricating oil in the mechanical seal structure of FIG.

FIG. 4 is a half side sectional view of a mechanical seal lubricating member 24 showing a second embodiment of the mechanical seal structure according to the present invention.

FIG. 5 is a half side sectional view of a mechanical seal lubricating member 24 showing a third embodiment of the mechanical seal structure according to the present invention.

6A and 6B are a half front view and a half side sectional view of a mechanical seal lubricating member 34 showing a fourth embodiment of the mechanical seal structure according to the present invention.

7A and 7B are a semi-front view and a semi-side sectional view of a mechanical seal lubricating member 34 showing a fifth embodiment of the mechanical seal structure according to the present invention.

FIG. 8 shows a mechanical seal lubricating member according to a sixth embodiment of the present invention.
FIG.

FIG. 9 is an enlarged view of an essential part showing a seventh embodiment of the mechanical seal structure according to the present invention.

FIG. 10 is a half cross-sectional view showing a conventional mechanical seal structure.

11 is a partially enlarged view of the mechanical seal structure shown in FIG.

[Explanation of symbols]

6 slider 6b Sliding contact part 11 rotation axis 14 stationary member 20 Cylindrical member 20a Sliding surface 24, 34, 44 Mechanical seal lubrication member 24b, 44a cylindrical part 24d, 34h Return passage 25 gap

Claims (3)

[Claims] 1. A rotating member having a sliding contact surface extending in a direction perpendicular to the axis of rotation, a stationary member which is restricted from rotating and is movably supported in the axial direction and pressed against the rotating member to slide the sliding member. In a mechanical seal structure including a sliding contact member slidingly contacting a contact surface, a lubricant is supplied to an inner side of a radius of a sliding contact portion supported by the stationary member and between the sliding contact surface and the sliding contact member. A mechanical seal structure comprising a mechanical seal lubricating member forming a part of the passage and a second passage for discharging the lubricant in a non-contact state with the rotating portion. 2. The mechanical seal according to claim 1, wherein an end portion of a partition wall that partitions the first passage and the second passage extends to a side opposite to the sliding contact member with respect to the sliding contact surface. Construction. 3. A communication port between the first passage and the second passage and a terminal end portion of the second passage are provided inside a partition wall separating the second passage and the rotating portion in a length direction. The mechanical seal structure according to claim 1.