JP2014173669A - Division type mechanical seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealability of a division surface, in a division type mechanical seal in which a stationary seal ring or a rotation seal ring is divided in a circumferential direction.SOLUTION: A stationary seal ring 10 or a rotation seal ring is divided in a circumferential direction, and respective division surfaces 25 comprise an outer peripheral side inclination surface 25a inclined in a constant direction toward an inner peripheral side from an outer peripheral part when viewed from a direction orthogonal to the axial direction of a rotation shaft 4, and an inner peripheral side inclination surface 25b inclined on the same side as the side of inclination of the outer peripheral side inclination surface 25a toward an outer peripheral side from an inner peripheral part. The outer peripheral side inclination surface 25a and the inner peripheral side inclination surface 25b are set so as to intersect with each other between the outer peripheral part and the inner peripheral part.

Description

  The present invention relates to a mechanical seal that is used for various rotary machine tools such as a pump, a stirrer, and a compressor, and is configured to be sealed by a sealing end surface that is an opposing end surface of a stationary sealing ring and a rotating sealing ring. In particular, the present invention relates to a split type mechanical seal in which a stationary seal ring or a rotary seal ring is divided in the circumferential direction.

Conventionally, an outside-type mechanical seal that seals a fluid that leaks from the inner periphery to the outer periphery of a sliding surface. A split type in which a stationary seal ring and a rotary seal ring are divided in the circumferential direction. As the mechanical seal, one having a flat dividing surface is known (see, for example, Patent Documents 1 and 2, hereinafter referred to as “Prior Art 1”).
Further, those having a split surface called “natural split” are also known (see, for example, Patent Documents 3 and 4. Hereinafter, referred to as “Prior Art 2”).
Furthermore, as shown in FIG. 7, in the split type mechanical seal, a groove 53 is provided on one surface 51 of the split surfaces 51 and 52 of the rotary seal ring 50, and the other surface 52 faces the groove 53. The thing provided with the protrusion 54 is known (for example, refer patent document 5; hereafter, it is called "the prior art 3.").

However, in the outside-type mechanical seal, only the “surface opening force” acts on the divided surface when pressure is applied from the inner diameter side. A gap was generated on the dividing surface due to a difference in pressure acting on the inside and outside and a minute distortion caused by a temperature distribution, resulting in a leak. Further, even those having a split surface called “natural split” of the prior art 2 have not been completely prevented, although leakage is reduced to some extent.
In addition, the conventional technique 3 with the dividing surface provided with irregularities is mainly intended to facilitate the fitting of the dividing surface, and even though the sealing performance in the radial direction is improved, the prior art This is considered to be almost the same as that having a split surface called “natural split” of No. 2.

JP-A-8-54067 JP 2010-19373 A JP 2008-8493 A JP 2009-13396 A JP 2005-127436 A

A first aspect of the present invention is to provide a split-type mechanical seal capable of improving the sealing performance of a split surface in a split-type mechanical seal in which a stationary seal ring or a rotary seal ring is split in the circumferential direction. It is aimed.
Secondly, the present invention provides a split type mechanical seal that can downsize the clamp mechanism of the split type mechanical seal and can stably fix the position of the split member during assembly. It is aimed.

In order to achieve the above object, a split-type mechanical seal according to the present invention is firstly installed in a shaft seal formed between a housing and a rotating shaft, and seals between the housing and the rotating shaft. A stationary seal ring and a rotary seal ring, wherein the stationary seal ring or the rotary seal ring is a split type seal ring divided in the circumferential direction, and the stationary seal ring or the split surface of the rotary seal ring is: When viewed from the direction orthogonal to the axial direction of the rotating shaft, the outer peripheral inclined surface is inclined in a fixed direction from the outer peripheral portion toward the inner peripheral side, and the outer peripheral inclined surface is inclined from the inner peripheral portion toward the outer peripheral side. And an inner peripheral inclined surface inclined to the same character side, and the outer peripheral inclined surface and the inner peripheral inclined surface are set so as to intersect between the outer peripheral portion and the inner peripheral portion. It is characterized by that.
According to this feature, even if the stationary sealing ring or the rotary sealing ring receives a pressure from the inner peripheral side and is distorted so as to increase in diameter and a radial shift occurs in the divided surface, the outer peripheral inclined surface follows. As a result, there is no gap and the sealing performance can be improved.

The split mechanical seal of the present invention is, secondly, in the first feature, disposed along the outer periphery of the stationary seal ring or the rotary seal ring, and the stationary seal ring or the rotary seal ring A clamp member that can be clamped in a radial direction, and the clamp member is divided in the circumferential direction in the same manner as the stationary seal ring or the rotary seal ring, and the outer peripheral surface of the stationary seal ring or the rotary seal ring and the clamp member The peripheral surface is characterized by being formed in a substantially V-shape comprising two tapered surfaces inclined in a cross section in the axial direction of the rotating shaft.
According to this feature, the size can be significantly reduced as compared with a device that clamps a sealing ring using a reamer bolt as in the prior art. Also, the inner peripheral surface of the clamp member is formed in a substantially V-shape consisting of two tapered surfaces that incline in the axial direction as it goes inward from both ends, like the outer peripheral surface of the stationary seal ring or the rotary seal ring. Therefore, the fixed position of the stationary seal ring or the rotary seal ring is stabilized. For example, even when the stationary seal ring or the rotary seal ring is reassembled after lapping, a stable seal surface state can be maintained.

Thirdly, the split mechanical seal according to the present invention is characterized in that, in the third feature, the clamp member includes two split pieces that are rotatable about a base end, and an elastic member is provided at a fastening portion of the split pieces. And the fastening portion is fastened through the elastic member.
According to this feature, the clamping force can be stabilized.

The present invention has the following excellent effects.
(1) An outer peripheral inclined surface in which a split surface of the stationary seal ring or the rotary seal ring is inclined in a fixed direction from the outer peripheral portion toward the inner peripheral side when viewed from the direction orthogonal to the axial direction of the rotation shaft, and the inner peripheral portion The outer peripheral side inclined surface and the inner peripheral side inclined surface are composed of an outer peripheral part and an inner peripheral part. The stationary sealing ring or the rotary sealing ring is distorted so as to increase in diameter by receiving pressure from the inner peripheral side, and a radial deviation occurs on the divided surface. Moreover, since it can follow in an outer peripheral side inclined surface, a clearance gap does not arise and a sealing performance can be improved.

(2) The outer peripheral surface of the stationary seal ring or the rotary seal ring and the inner peripheral surface of the clamp member are formed in a substantially V shape comprising two tapered surfaces inclined in the cross section in the axial direction of the rotary shaft. Compared to a device that clamps a sealing ring using a reamer bolt as in the prior art, the size can be significantly reduced. Also, the inner peripheral surface of the clamp member is formed in a substantially V-shape consisting of two tapered surfaces that incline in the axial direction as it goes inward from both ends, like the outer peripheral surface of the stationary seal ring or the rotary seal ring. Therefore, the fixed position of the stationary seal ring or the rotary seal ring is stabilized. For example, even when the stationary seal ring or the rotary seal ring is reassembled after lapping, a stable seal surface state can be maintained.

(3) The clamp member is provided with two split pieces that are rotatable with the base end as a fulcrum, an elastic member is disposed on the fastening portion of the split piece, and the fastening portion is fastened via the elastic member, Clamping force can be stabilized.

It is a longitudinal section showing an example of the outside type split type mechanical seal concerning the example of the present invention. It is a figure which shows the sealing ring used for the outside-type division | segmentation type mechanical seal which concerns on the Example of this invention, Comprising: (a) is a side view seen from the surface orthogonal to a rotating shaft, (b) is AA. It is sectional drawing. It is a figure explaining the state when the sealing ring which concerns on the Example of this invention receives pressure from the inner peripheral side, Comprising: (a) is the state which the pressure is acting, (b) and (c) It shows a state distorted by pressure. It is a figure explaining the example of the division surface in the sealing ring which concerns on the Example of this invention. It is a figure which shows the state which mounted | wore the sealing ring which concerns on the Example of this invention, Comprising: (a) is the side view seen from the surface orthogonal to a rotating shaft, (b) is BB sectional drawing, ( c) and (d) show other examples of the fastening portion. It is a figure which shows the processing method of the sealing ring which concerns on the Example of this invention. FIG. 9 is a diagram for explaining a conventional technique 3;

  EMBODIMENT OF THE INVENTION With reference to drawings, the form for implementing this invention is demonstrated illustratively based on an Example below. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are not intended to be limited to them unless otherwise specified.

A mechanical seal according to an embodiment of the present invention will be described with reference to FIGS.
The present invention is suitable for an outside-type mechanical seal that seals a fluid that leaks from the inner periphery of the sliding surface toward the outer peripheral direction. The present invention can also be applied to an inside-type mechanical seal that seals a fluid that leaks toward the inside.
In the following, the case of an outside type mechanical seal will be described.

FIG. 1 is a longitudinal sectional view showing an example of an outside-type split mechanical seal according to an embodiment of the present invention.
The split-type mechanical seal device 1 is mounted to seal the sealed fluid flow passage 5 between the inner peripheral surface 3 of the housing 2 and the rotary shaft 4. The flow passage 5 in the housing 2 is formed so as to communicate with the internal high-pressure fluid side (sealed fluid side).

A first outer peripheral surface 11 of a stationary seal ring 10 divided in two in the circumferential direction is fitted to the inner peripheral surface 3 of the housing 2 so as to be movable in the axial direction. And the annular groove 12 is formed in the inner peripheral surface 3 of the part which both fit. A first O-ring 13 made of rubber or resin is disposed in the annular groove 12. The stationary seal ring 10 is made of, for example, silicon carbide or a carbon material. Further, the inner peripheral surface 14 of the stationary seal ring 10 is formed to have a larger diameter than the rotating shaft 4. The space between the inner peripheral surface 14 and the rotary shaft 4 communicates with the flow passage 5. Further, a seal surface S1 is provided on the end surface of the stationary seal ring 10, and a second outer peripheral surface 15 having a larger diameter than the first outer peripheral surface 11 is formed on the outer peripheral side of the seal surface S1.
The number of divisions of the stationary seal ring is not limited to two divisions, and may be three or more divisions.

On the second outer peripheral surface 15 of the stationary seal ring 10, a clamp member 16 for bringing the divided surface of the stationary seal ring 10 into close contact is fitted. This clamp member 16 is also divided into two in the circumferential direction. The clamp member 16 is formed in a structure that can be opened and closed with a pin 17 provided on one side of the dividing surface as a fulcrum, and is closely coupled by a bolt 18 provided on the other side of the dividing surface.
The stationary seal ring 10 and the clamp member 16 will be described in detail later.

  As shown by a two-dot chain line, the clamp member 16 has a mounting hole 19 provided with a spring seat on the bottom surface. One end of a coil spring 20 is inserted into the mounting hole 19 and is seated on the spring seat. Yes. The other end of the coil spring 20 is connected to and supported by the end surface 6 of the housing 2. Due to the action of the coil spring 20, the stationary seal ring 10 is pressed against the rotary seal ring 20 side described later via the clamp member 16.

The rotary seal ring 30 has a substantially L-shaped cross section and is divided into two in the circumferential direction. The inner peripheral surface of the rotary seal ring 30 is formed on the joint surface 31 and the step surface 32. The joint surface 31 is fitted to the rotating shaft 4, and a second O-ring 33 made of rubber or resin material is mounted in the stepped surface 32. The end face of the rotary seal ring 30 is formed on the seal surface S2, and comes into contact with the seal surface S1 of the stationary seal ring 10 to seal the sealed fluid. The rotary seal ring 30 is made of a material such as silicon carbide, carbon, or ceramic.
In addition, the division | segmentation number of a rotation sealing ring is not limited to 2 divisions, Three or more divisions may be sufficient.

A clamp member 35 for bringing the divided surface of the rotary seal ring 30 into close contact with the outer peripheral surface 34 of the rotary seal ring 30 is fitted. The clamp member 35 has the same structure as the above-described clamp member 16 and is divided into two in the circumferential direction. The clamp member 35 is formed in a structure that can be opened and closed with a pin 36 provided on one side of the dividing surface as a fulcrum, and is closely coupled by a bolt 37 provided on the other side of the dividing surface.
Further, a drive pin locking hole 38 is formed on the side surface of the clamp member 35 as shown by a two-dot chain line.
The rotary seal ring 20 and the clamp member 25 will be described in detail later.

  A clamping ring 40 is fitted to the rotary shaft 4 on the side surface of the clamp member 35. The tightening ring 40 is divided into two in the axial direction, and the divided surfaces are coupled by bolts 41, and the rotating shaft 4 is tightened to connect the two. An annular convex portion 42 is formed on the side surface of the tightening ring 40, and the second O-ring 33 is pressed by the annular convex portion 42. Further, the side surface of the clamping ring 40 and the side surface of the clamp member 35 are joined to support the axial direction of the clamp member 35 and the rotary seal ring 30. Further, a drive pin 43 is driven and fixed to the side surface of the tightening ring 40. The drive pin 43 is locked in the locking hole 38 of the clamp member 35, and the clamp member 35 and the rotary seal together with the rotary shaft 4. The ring 30 is rotated.

Next, with reference to FIG. 2 to FIG. 6, the stationary sealing ring 10 and the rotating sealing ring 30 (hereinafter, the stationary sealing ring and the rotating sealing ring may be simply referred to as “sealing ring”). ) And the clamp members 16 and 35 will be described.
The present invention can be similarly applied to both the stationary seal ring 10 and the rotary seal ring 30, and any of the clamp member 16 for the stationary seal ring 10 and the clamp member 35 for the rotary seal ring 30. In the following, the stationary seal ring 10 and its clamp member 16 will be described as an example. The same reference numerals as those in FIG. 1 denote the same members, and a duplicate description is omitted.

2A, the inner peripheral side of the stationary seal ring 10 is the high-pressure fluid side (sealed fluid side), the outer peripheral side is the low-pressure fluid side (for example, the atmosphere side), and the stationary seal ring 10 is It is a split-type sealing ring divided into two.
The split surfaces 25 of the stationary seal ring 10 are provided at two points symmetrically at intervals of about 180 °, and each of the split surfaces 25 extends from the outer peripheral portion to the inner peripheral side when viewed from the direction orthogonal to the axial direction of the rotating shaft 4. An outer peripheral inclined surface 25a that inclines in a certain direction (counterclockwise in FIG. 2A), and an inner side that inclines from the inner peripheral portion toward the outer peripheral side on the same side as the inclined side of the outer peripheral inclined surface 25a. The outer peripheral side inclined surface 25a and the inner peripheral side inclined surface 25b are set so as to cross between the outer peripheral portion and the inner peripheral portion. Of course, the dividing surface 25 is provided over the entire width of the stationary sealing ring 10.
2 shows an example in which the stationary sealing ring 10 is divided into two in the circumferential direction. However, the number is not limited to this, and the number of divisions such as three divisions and four divisions may be set as appropriate.

Further, the inclination angle θ of the outer peripheral side inclined surface 25a and the inner peripheral side inclined surface 25b is determined to be an optimal value in terms of design, but in the case shown in FIG. 2, both are about 45 °.
Note that the inclination angle θ is not limited to about 45 ° and can take various values. Even if the inclination angle θ1 of the outer peripheral side inclined surface 25a and the inclination angle θ2 of the inner peripheral side inclined surface 25b are different. Good.

FIG. 2 (b) shows the AA cross section of FIG. 2 (a), and the second outer peripheral surface 15 of the stationary seal ring 10 into which the clamp member 16 is fitted is in the cross section in the direction along the rotation axis. It is formed in a substantially V shape comprising two tapered surfaces 15a and 15b that incline toward the center of the rotating shaft as it goes inward from both ends. The two tapered surfaces 15a and 15b are desirably formed symmetrically.
In the case shown in FIG. 2B, the tapered surfaces 15a and 15b are inclined from both ends toward the center of the rotating shaft, that is, in a direction in which the diameter decreases. You may incline in the direction which becomes large. The reason why the second outer peripheral surface 15 is formed in a substantially V shape will be described later in detail at the clamp member 16.

FIG. 3 is a diagram for explaining a state where the stationary sealing ring 10 receives pressure from the inner peripheral side, where (a) shows a state where pressure is acting, and (b) and (c) show pressure. Shows a distorted state.
As shown in FIG. 3 (a), when the stationary sealing ring 10 receives pressure p1 from the inner periphery side by the sealed fluid, the outer peripheral portion is low pressure, so the outer peripheral portion is clamped by the clamp member 16. However, the stationary seal ring 10 is distorted so as to increase in diameter. At that time, there may be a difference in the amount of distortion between the left split ring 10a and the right split ring 10b.
FIG. 3B shows a case where the right split ring 10b is more distorted. In the split surface 25, the surface pressure p2 of the outer peripheral inclined surface 25a is increased, and the surface pressure is applied to the inner peripheral inclined surface 25b. Does not work.
On the other hand, FIG. 3C shows a case where the left split ring 10a is more distorted. In the split surface 25, the surface pressure p3 of the inner peripheral inclined surface 25b is increased, and the outer peripheral inclined surface 25a. Surface pressure does not act on the surface.
In the case of FIG. 3B, when the component force along the outer peripheral inclined surface 25a based on the surface pressure p2 is larger than the frictional force of the outer peripheral inclined surface 25a, the right split ring 10b with respect to the left split ring 10a. Is displaced in the radial direction. Even if there is a radial deviation between the two, the outer peripheral side inclined surface 25a can follow, so that no gap is generated.
In the case of FIG. 3C, when the component force along the inner peripheral inclined surface 25b based on the surface pressure p3 is larger than the frictional force of the inner peripheral inclined surface 25b, the left split ring 10b is divided on the left side. The ring 10a is displaced in the radial direction. Even if a radial misalignment occurs between the two, the inner peripheral side inclined surface 25b can follow, so that no gap is generated.

  Thus, in the present invention, the outer peripheral side inclined surface 25a that inclines in a fixed direction from the outer peripheral portion toward the inner peripheral side, and the same side as the outer peripheral side inclined surface 25a that inclines from the inner peripheral portion toward the outer peripheral side. By providing the dividing surface 25 composed of the inner peripheral inclined surface 25b inclined to the side, no gap is generated in the dividing surface 25 and any sealing ring is distorted, so that the sealing performance can be improved. it can.

Next, various examples of the dividing surface 25 will be described with reference to FIG.
In the dividing surface 25 shown in (a), the inclination angle θ1 of the outer peripheral side inclined surface 25a and the inclination angle θ2 of the inner peripheral side inclined surface 25b are each about 45 °.
Further, in the divided surface 25 shown in FIG. 5B, the inclination angle θ1 of the outer peripheral side inclined surface 25a is as large as about 75 °, and the inclination angle θ2 of the inner peripheral side inclined surface 25b is about 45 °. In this case, since the component force along the outer peripheral side inclined surface 25a can be reduced, the deviation hardly occurs.
Further, in the dividing surface 25 shown in (c), the inclination angle θ1 of the outer peripheral side inclined surface 25a and the inclination angle θ2 of the inner peripheral side inclined surface 25b are respectively large as about 75 °. In this case, since the area of the outer peripheral inclined surface 25a can be increased, a gap is hardly generated.

  As described above, the stationary seal ring 10 (or the rotary seal ring 30) of the present embodiment is divided in the circumferential direction, and each divided surface 25 is viewed from a direction orthogonal to the axial direction of the rotary shaft 4. The outer peripheral side inclined surface 25a inclined in a fixed direction from the outer peripheral portion toward the inner peripheral side, and the inner peripheral side inclined inclined from the inner peripheral portion toward the outer peripheral side on the same side as the inclined side of the outer peripheral side inclined surface 25a Since the outer peripheral side inclined surface 25a and the inner peripheral side inclined surface 25b are set so as to intersect between the outer peripheral portion and the inner peripheral portion, the diameter is received from the inner peripheral side. Therefore, even if a radial deviation occurs on the dividing surface, the outer peripheral side inclined surface 25a can follow, so that no gap is formed and the sealing performance can be improved.

Next, the clamp member will be described with reference to FIG.
The clamp member 16 is disposed along the outer peripheral portion of the stationary seal ring 10 and clamps the stationary seal ring 10 in the radial direction.
As shown in FIG. 5A, the clamp member 16 is divided into two in the circumferential direction like the stationary seal ring 10, and includes two divided pieces 16 a and 16 b that are rotatable about the base end 26 as a fulcrum. Is provided with a pin 17 and has a hinge structure that can be opened and closed with the pin 17 as a fulcrum. The hinge structure at the base end 26 is formed, for example, by forming a concave portion at the end of the right split piece 16b and fitting the convex portion formed on the left split piece 16a into the concave portion. It is comprised so that the pin 17 may be inserted in a part.

On the other hand, a fastening portion 28 for tightly coupling the divided pieces 16a and 16b is provided on the side opposite to the base end 26 by about 180 °. In the fastening portion 28, the divided pieces 16 a and 16 b are tightly coupled by the bolt 18. In order to stabilize the clamping force, it is desirable that an elastic member 29 such as a spring or a spring washer is disposed on the fastening portion 28.
In FIG. 5A, a spring washer is used as the elastic member 29.
5C and 5D, a spring is used as the elastic member 29. In the case of FIG. 5C, the spring is mounted between the split piece 16b and the head of the bolt 18, and FIG. In the case of (d), the spring is mounted between the split pieces 16a and 16b. When a spring is used as the elastic member 29, the clamping force is stabilized, and the spring strength can be adjusted to adjust the pressure resistance of the divided pieces 16a and 16b.
Since the two divided pieces 16a and 16b of the clamp member 16 need to be accurately coupled so as not to be displaced in the axial direction, the hinge structure and the fastening portion 28 having the base end 26 as a fulcrum are formed with high accuracy. The

As shown in FIG. 5B, the inner peripheral surface 27 of the clamp member 16 rotates as it goes inward from both ends in the cross section in the direction along the rotation axis, like the second outer peripheral surface 15 of the stationary seal ring 10. It is formed in a substantially V shape composed of two tapered surfaces 27a and 27b inclined toward the center of the shaft. The two tapered surfaces 27a and 27b are desirably formed symmetrically.
In FIG. 5B, the tapered surfaces 27a and 27b are inclined toward the center of the rotation axis as they go inward from both ends so as to match the second outer peripheral surface 15 of the stationary seal ring 10, that is, Although it is inclined in the direction in which the diameter decreases, the present invention is not limited to this, and when the second outer peripheral surface 15 of the stationary sealing ring 10 is inclined in the direction in which the diameter increases, it may be inclined in the direction in which the diameter increases. Good.

  The second outer peripheral surface 15 of the stationary seal ring 10 and the inner peripheral surface 27 of the clamp member 16 are both substantially V-shaped, so that when the clamp member 16 is fastened, the stationary seal ring 10 is divided into two parts. The ring 10a and the split ring 10b are aligned in the axial position by a substantially V-shaped groove, and the axial positioning is accurately performed. In addition, since the two tapered surfaces 27a and 27b are formed symmetrically, a uniform clamping force acts on the stationary seal ring 10 on the left and right, and the stationary seal ring 10 can be held without being biased. .

  As described above, the clamp member 16 (or the clamp member 35) of the present embodiment is divided in the circumferential direction in the same manner as the stationary seal ring 10, and is divided into two divided pieces 16a and 16b that are rotatable about the base end 26 as a fulcrum. In the fastening portion 28, the split pieces 16a and 16b are tightly coupled by the bolt 18, so that the size can be greatly reduced compared to a device that clamps the sealing ring using a reamer bolt as in the prior art 3. Is possible. In addition, the inner peripheral surface 27 of the clamp member 16 is substantially V formed of two tapered surfaces 27a and 27b that incline in the axial direction as it goes inward from both ends, like the second outer peripheral surface 15 of the stationary sealing ring 10. Since the stationary seal ring 10 is formed in a letter shape, the position of the stationary seal ring 10 is stabilized. For example, even when the stationary seal ring 10 is reassembled after lapping, a stable seal surface state can be maintained. Furthermore, the clamping force can be stabilized by disposing an elastic member 29 such as a spring or a spring washer at the fastening portion 28.

Next, an example of a method for processing a split stationary seal ring or a rotary seal ring will be described with reference to FIG. In FIG. 6, the case where the stationary sealing ring 10 is manufactured in two parts will be described.
(1) As shown in FIG. 6A, a circumferential ring 45 having the same shape as the stationary sealing ring 10 assembled in a circumferential shape is prepared.
(2) On the side surface of the circumferential ring 45, two substantially V-shaped dividing surfaces 25, 25 are marked.
(3) For example, when the left part of the two divided surfaces 25 and 25 is left, straight lines m1 and m2 in contact with the right side of the two divided surfaces 25 and 25 are drawn and cut along the straight lines. Let the left part be part 1.
(4) Discard the excess part on the right side.
(5) For the component 1, the hatched portions 45b, 45c and 45d on the right side of the dividing surfaces 25 and 25 shown in FIG. 6B are removed.
(6) The required number of parts 1 are manufactured by repeating the above (1) to (5).
(7) The outer peripheral side inclined surface 25a and the inner peripheral side inclined surface 25b of the dividing surfaces 25, 25 of the component 1 are lapped using a V-shaped special jig or the like.
Alternatively, the two parts 1 are combined as shown in FIG. 6C, and the dividing surfaces 25 and 25 are finished by sliding.
In the case of 2 divisions, the surplus part on the right side is discarded. However, if the sealing performance is secured even in 3 divisions or 4 divisions, the excess part produced in 2 divisions can be used as 3 or 4 division parts. Can be used.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the stationary seal ring or the rotary seal ring having the shape shown in FIG. 1 has been described as an example. However, the present invention is not limited to this, and other shapes of the static seal ring or the rotary seal ring have other shapes. Of course, it can also be applied.

  Further, for example, in the above-described embodiment, the stationary sealing ring and the clamp member attached thereto are described as examples of the sealing ring. However, the present invention is not limited thereto, and the rotary sealing ring and the clamp attached thereto are exemplified. The same applies to the members.

  Further, for example, in the above embodiment, the outside type mechanical seal in which the high-pressure sealed fluid exists on the inner peripheral side has been described, but the present invention can also be applied to the inside type in which the outer peripheral side has high-pressure fluid. is there.

DESCRIPTION OF SYMBOLS 1 Division type mechanical seal apparatus 2 Housing 3 Inner peripheral surface of housing 4 Rotating shaft
5 Flow path for fluid to be sealed 6 End face of housing 10 Static seal ring 11 First outer peripheral surface of stationary seal ring 12 Annular groove 13 First O-ring 14 Inner peripheral surface of stationary seal ring 15 Second outer peripheral surface of stationary seal ring 16 Clamp Member 17 Pin 18 Bolt 19 Mounting hole 20 Coil spring 25 Dividing surface 25a Outer peripheral side inclined surface
25b Inner peripheral inclined surface
26 Clamping member base end 27 Clamping member inner peripheral surface 28 Fastening portion 29 Elastic member 30 Rotating seal ring 31 Joint surface 32 Step surface 33 Second O-ring 34 Outer peripheral surface of rotating seal ring 35 Clamp member 36 Pin 37 Bolt 38 Drive Locking hole for pin 40 Tightening ring 41 Bolt 42 Annular projection 43 Drive pin S1 Seal surface of stationary seal ring S2 Seal surface of rotary seal ring

Claims (3)

In a mechanical seal that is attached to a shaft seal formed between the housing and the rotating shaft and seals between the housing and the rotating shaft,
With stationary and rotating seal rings,
The stationary seal ring or the rotary seal ring is a split type seal ring divided in the circumferential direction,
The dividing surface of the stationary seal ring or the rotary seal ring includes an outer peripheral side inclined surface inclined in a fixed direction from the outer peripheral part toward the inner peripheral side when viewed from a direction orthogonal to the axial direction of the rotary shaft, and an inner peripheral part From the outer peripheral side inclined surface toward the outer peripheral side and the inner peripheral side inclined surface inclined to the same character side,
The split type mechanical seal characterized in that the outer peripheral side inclined surface and the inner peripheral side inclined surface are set so as to cross between the outer peripheral portion and the inner peripheral portion.   A clamp member disposed along an outer peripheral portion of the stationary seal ring or the rotary seal ring, the clamp member being capable of radially tightening the stationary seal ring or the rotary seal ring; Like the rotary seal ring, it is divided in the circumferential direction, and the outer peripheral surface of the stationary seal ring or the rotary seal ring and the inner peripheral surface of the clamp member are composed of two tapered surfaces that are inclined in the cross section in the axial direction of the rotary shaft. The split mechanical seal according to claim 1, wherein the split mechanical seal is formed in a substantially V shape. The clamp member is provided with two split pieces that are rotatable with a base end as a fulcrum, an elastic member is disposed at a fastening portion of the split piece, and the fastening portion is fastened through the elastic member. The split-type mechanical seal according to claim 2, characterized in that:

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