JP4711573B2 - Mechanical seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical seal device used for, for example, a pump, a stirrer, a polishing machine, a rotary joint and the like. In particular, the present invention relates to a mechanical seal device suitable for sealing a fluid containing a slurry.
[0002]
[Prior art]
Regarding the prior art of the present invention, there is a mechanical seal of Conventional Example 1 shown in FIG. 3 of Japanese Utility Model Publication No. 1-29325. FIG. 5 is a half sectional view of the mechanical seal 100 disclosed in this publication.
[0003]
In FIG. 5, the mechanical seal 100 is disposed between the housing 160 and the rotating shaft 130 in order to seal the sealed fluid in the housing 160. The mechanical seal 100 seals the relative seal surface 106 of the divided stationary seal ring 105 and the divided seal surface 103 of the rotary seal ring 102 in contact with each other.
[0004]
The outer peripheral surface of the stationary seal ring 105 is fixed to the housing 160 via an O-ring (not shown). At the same time, the divided surfaces of the stationary seal ring 105 are sealed together.
The stationary seal ring 105 is made of a carbon material. A relative seal surface 106 is formed on the surface protruding at one end. A gap is formed between the inner peripheral surface of the stationary sealing ring 105 and the sleeve 131.
[0005]
On the other hand, a sealing surface 103 is formed on the opposing surface of the rotating sealing ring 102 facing the stationary sealing ring 105, and the sealing surface 103 is in close contact with the relative sealing surface 106. The rotary sealing ring 102 is also sealed by joining the divided surfaces divided into two. Further, a taper surface 104 is formed on the opposite side of the sealing surface 103 of the rotary seal ring 102.
In order to hold the divided sealing ring for rotation 102 from the outer peripheral side, a taper fitting surface 111 of a retainer 110 to which a sleeve 131 is movably fitted is joined to the taper surface 103. The taper fitting surface 111 is provided on the inner peripheral surface of the tip of the retainer 110.
[0006]
The retainer 110 is configured to be pressed by a spring 115 to tighten the tapered surface 104 of the rotary seal ring 102. Further, the spring 115 is supported by a flange portion fitted to the rotating shaft 130. The retainer 110 and the inner peripheral surface of the sleeve 116 are sealed with an O-ring between the fitting surfaces.
[0007]
In the mechanical seal 100 configured as described above, the rotating seal ring 102 and the stationary seal ring 105 are divided, but the retainer 110 and the spring 115 are not divided. Therefore, when the mechanical seal 100 is mounted, there is a problem that the rotating shaft 130 and the sleeve 131 must be taken out from the apparatus and mounted.
[0008]
When the fluid to be sealed contains slurry, if a rally is interposed between the taper surface 104 of the rotary seal ring 102 and the taper fitting surface 111 of the retainer 110, there will be a gap between the mating taper surfaces. During this time, the sealed fluid leaks from the gap.
Furthermore, slurry or high-viscous fluid to be sealed adheres to the inner peripheral surface of the spring 115 or the retainer 110 and the operation of the rotary seal ring 102 is deteriorated, and the sealing performance of the seal surface 103 is deteriorated.
[0009]
Next, as another prior art, there is a mechanical seal of Conventional Example 2 shown in FIG. 2 of JP-A-7-198043. This publication discloses a mechanical seal shown in FIG.
[0010]
In FIG. 6, the outer peripheral surface of the rotary shaft 130 is in contact with the seal surface 123 of the rotary seal ring 122 divided into two and the relative seal surface 126 of the stationary seal ring 125 divided into two in contact with each other. Is arranged.
The two-divided rotary seal ring 122 is integrally held by a holder 127. The holder 127 is also divided into two parts, and is fastened by bolts (not shown) in a direction orthogonal to the dividing surface. Further, an O-ring annular groove 133 is formed in the holder 127, and an O-ring 134 is arranged in the annular groove 133 to seal the fitting between the rotary shaft 130 and the holder 127. For this reason, the holder 127 is formed in a large size.
[0011]
Then, one end of the drive pin 128 is coupled to the inner peripheral side of one end of the holder 127 and is engaged with the groove 132 of the sealing ring 122 for rotation to rotate the two together. Further, an O-ring 129 is disposed in a trapezoidal space 130 having a square cross section between the fitting of the holder 127 and the rotation sealing ring 122 to seal between them.
Further, the holder 127 and the rotation sealing ring 122 are disposed in an empty chamber 162 of a gland assembly 160A attached to the housing 160. And the outer peripheral surface 136 of the holder 127 is formed between the inner peripheral surface of the vacant chamber 162 at an interval, communicates with the inside of the device, and the sealed fluid flows in.
[0012]
Next, the stationary seal ring 125 is provided with an inner peripheral surface with a gap between the rotary shaft 130 and the outer peripheral surface is slidably fitted to the inner peripheral surface of the grant assembly 160A. A seal surface 126 is provided at one end. Furthermore, the surface opposite to the seal surface 126 is pressed elastically by leaf springs 135 provided at equal intervals along the circumferential direction. Furthermore, the gap between the outer peripheral surface of the stationary seal ring 125 and the inner peripheral surface of the ground assembly 160A is formed in a longitudinal space 161 parallel to the cross-sectional axis direction. A moving O-ring 131 is provided in the longitudinal space 161. The moving O-ring 131 is arranged so as to be movable in the axial direction when receiving the pressure of the sealed fluid.
[0013]
The mechanical seal 150 of the conventional example 2 configured as described above is configured to move by the pressure of the sealed fluid in a state where the moving O-ring 131 seals between the fixing seal ring 125 and the gland assembly 160A. Therefore, when the fluid to be sealed contains high viscosity or slurry, the O-ring 131 is fixed to one end side with impurities of the fluid to be sealed interposed between the O-ring 131 and the opposing surface, The stationary sealing ring 125 is not moved by the pressing force of the leaf spring 135. As a result, the sealing contact of the relative seal surface 126 becomes incomplete, and a slurry is interposed between the seal surface 123 and the relative seal surface 126 to promote wear and deteriorate the sealing ability.
[0014]
Further, since the stationary sealing ring 125 is only held by the moving O-ring 131, the sealing contact on the dividing surface of the stationary sealing ring 125 that is long in the axial direction becomes incomplete, and the sealed fluid is separated from the dividing surface. Will leak.
Furthermore, for the structure in which the drive pin 128 is coupled to the holder 127 or the stationary seal ring 125 is pressed by the leaf spring 135, the holder 127, the rotation seal ring 122, the stationary seal ring 125, and the leaf spring 135 are attached. The structure and the shape of the divided gland assembly 160A become complicated, which increases the processing cost. Furthermore, the assembly of these parts is complicated, making assembly work difficult.
[0015]
[Problems to be solved by the invention]
As described in the above-described conventional example 1, the rotary seal ring 102 and the stationary seal ring 105 are divided, but the retainer 110 and the spring 115 are not divided, so that the mechanical seal 100 is attached. Since the rotating shaft 130 and the sleeve 131 must be taken out from the apparatus and attached, there is a problem that the assembly effect is not exhibited even if the rotating sealing ring 102 and the stationary sealing ring 105 are divided.
[0016]
Further, when the fluid to be sealed contains slurry, there is a rally between the taper surface 104 of the rotary seal ring 102 and the taper fitting surface 111 of the retainer 110. During this time, the sealed fluid leaks from the gap.
Furthermore, slurry or a highly viscous fluid to be sealed adheres to the inner peripheral surface of the spring 115 or the retainer 110 and the responsive operation to the sealing surface of the rotation sealing ring 102 is deteriorated, and the sealing capability of the sealing surface 103 is improved. Cannot be demonstrated.
[0017]
Further, in the above-described conventional example 2, when the fluid to be sealed contains high viscosity or slurry, impurities of the fluid to be sealed are interposed between the O-ring 131 and its opposite surface so that the O-ring 131 is moved to one end side. Since the stationary sealing ring 125 does not move by the pressing force of the leaf spring 135, the sealing contact of the relative seal surface 126 becomes incomplete, and the seal surface 123 and the relative seal surface 126 are not connected. While the slurry is interposed, the wear is promoted and the sealing ability of the mechanical seal is deteriorated.
[0018]
Further, since the stationary sealing ring 125 is only held by the moving O-ring 131, the sealing contact of the dividing surface which is long in the axial direction cannot be brought into perfect contact, and the sealed fluid flows from the dividing surface. It will leak.
Furthermore, for the structure in which the drive pin 128 is coupled to the holder 127 or the stationary seal ring 125 is pressed by the leaf spring 135, the holder 127, the rotation seal ring 122, the stationary seal ring 125, and the leaf spring 135 are attached. The structure and the shape of the divided gland assembly 160A become complicated, which increases the processing cost. Furthermore, the assembly of these parts is complicated, making assembly work difficult as well as the assembly cost.
[0019]
The present invention has been made in view of the above problems, and its technical problem is to enable the common use of a seal ring of a mechanical seal to reduce the number of parts and reduce the cost of parts. It is in.
In addition, there is no drive pin for fixing the sealing ring and no spring for pressing the sealing ring, and impurities of the fluid to be sealed adhere to these parts, and the close response of the sealing ring to the relative seal surface is achieved. It is to prevent deterioration.
[0020]
An object of the present invention is to effectively seal a sealed fluid including slurry and a highly viscous sealed fluid without causing impurities to adhere to the O-ring and causing a problem in the sealing performance.
Another object of the present invention is to secure a seal at the joining of the divided surface of the divided rotary sealing ring and the divided surface of the divided stationary sealing ring.
[0021]
[Means for Solving the Problems]
The present invention has been made to solve the above-described technical problems, and the technical means is configured as follows.
[0022]
A mechanical seal device according to a first aspect of the present invention is a mechanical seal device that seals outflow of a sealed fluid between a housing having an inner peripheral surface and a rotating shaft disposed in the inner peripheral surface of the housing. A rotating seal ring having an inner peripheral surface into which the rotary shaft is fitted, a seal surface at one end and a split surface in which the circumferential direction is separable, and an outer periphery of the rotary seal ring A first outer taper surface that diverges toward the seal surface; a first inner taper surface that faces the first outer taper surface; and a split surface that is separable in the circumferential direction. A first holder assembled in an annular shape having a tightening outer peripheral surface capable of tightening the split surface; and a fitting surface that fits the tightening outer peripheral surface of the first holder and closely contacts the split surface of the first holder. Fits on the rotating shaft A first clamping ring having a peripheral surface and a split surface in which the circumferential direction is separable; and a relative seal surface that is substantially in the same shape as the rotary seal ring and is in close contact with the seal surface A stationary seal ring having an inner peripheral surface into which the rotating shaft is fitted and having a split surface that can be divided in the circumferential direction, and a shape that diverges toward the relative seal surface side of the outer periphery of the stationary seal ring A tightening outer periphery having a second outer taper surface and a second inner taper surface facing the second outer taper surface and having a split surface whose circumferential direction is separable and joining the split surfaces to each other A second holder assembled in an annular shape having a surface, and having a first O-ring made of a rubber-like elastic material that is pressure-bonded between the first inner tapered surface and the first outer tapered surface, 2 Crimped between the inner tapered surface and the second outer tapered surface And it has a first 2O ring made of beam-like elastic material.
[0023]
The mechanical seal device according to the first aspect of the present invention includes an O-ring made of a rubber-like elastic material that is pressure-bonded between a first inner tapered surface and the first outer tapered surface, and the second inner tapered surface. And an O-ring made of a rubber-like elastic material that is pressure-bonded between the surface and the second outer tapered surface, so that the seal surface of the rotary seal ring and the relative seal surface of the stationary seal ring are mutually connected by this O-ring. Acts as a pressure contact. For this reason, the spring which presses a sealing ring is not required.
Further, since the O-ring is strongly pressed by both tapered surfaces, no drive pin is required. Furthermore, since the rotary seal ring and the stationary seal ring have substantially the same shape, the parts can be made common and a mass production effect can be expected. Therefore, the number of parts of the mechanical seal device can be reduced.
Further, the pressure-bonded state of the O-ring can prevent the sealed fluid slurry and high-viscosity impurities from entering the joint surface of the O-ring, so that the sealed fluid containing the slurry or the highly-viscous sealed fluid is sealed. It is possible to obtain a mechanical seal device suitable for the operation.
[0024]
The mechanical seal device according to a second aspect of the present invention is configured such that a space between the first inner tapered surface and the first outer tapered surface is reduced toward the seal surface side, and the second inner tapered surface and the first outer tapered surface are The space between the two outer tapered surfaces is reduced toward the sealing surface side.
[0025]
In the mechanical seal device according to the second aspect of the present invention, the distance between the first outer tapered surface of the rotary seal ring and the first inner tapered surface of the holder is narrower toward the seal surface side. The seal surface can be pressed against the relative seal surface by the elastic force of the O-ring.
Further, since the space between the stationary sealing ring and the tapered surface of the second holder is also configured in the same manner, it is possible to bring the relative sealing surface into close contact with the sealing surface with the same effect. For this reason, while being able to simplify the structure of a sealing ring, both can make the same shape and the cost by mass production can be reduced.
[0026]
According to a third aspect of the present invention, there is provided the mechanical seal device according to the present invention, wherein the split surface of the rotary seal ring, the split surface of the stationary seal ring, the split surface of the first holder, and the split surface of the second holder are: These annular bodies are formed in a cross-section that is broken so that they can be joined.
[0027]
In the mechanical seal device according to the third aspect of the present invention, each split surface is formed with irregularities that can be joined to the split surface by breaking the integrally formed ring shape in a straight line in the axial direction. When the divided surfaces are joined, they can be joined together without shifting. For this reason, a joint surface becomes firm.
[0028]
According to a fourth aspect of the present invention, there is provided the mechanical seal device according to the present invention, wherein the split surface of the sealing ring for rotation, the split surface of the stationary seal ring, the split surface of the first holder, and the split surface of the second holder And a rubber-like elastic material sealing layer.
[0029]
In the mechanical seal device of the present invention according to claim 4, since a sealing layer is provided by coating a rubber-like elastic material on each divided surface, the sealing surface is hermetically bonded if each divided surface is pressed. It becomes possible to prevent the sealed fluid from leaking from the dividing surface.
[0030]
In the mechanical seal device of the present invention according to claim 5, the first holder and the second holder are formed in substantially the same shape.
[0031]
In the mechanical seal device according to the fifth aspect of the present invention, the first inner tapered surface of the first holder and the second inner tapered surface of the second holder are respectively connected to the first outer tapered surface of the rotation sealing ring and the stationary tape. Since the shape corresponds to the second outer tapered surface of the seal ring, the first holder and the second holder can be formed in the same shape.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a mechanical seal device according to the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a half sectional view of a mechanical seal device 1 according to a first embodiment of the present invention. FIG. 2 is a plan view of the rotary seal ring 2 of FIG. FIG. 3 is a plan view of the first holder of FIG. FIG. 4 is a plan view of the tightening ring.
[0033]
In FIG. 1, 1 is a mechanical seal device. The mechanical seal device 1 is a mechanical seal device attached to a sealed fluid containing slurry or a pump for a highly viscous sealed fluid.
On the inner peripheral surface of the pump housing 60, there is fitted a rotary shaft 50 having an outer peripheral surface 56, which is disposed in a state where rotation and relative movement in the axial direction are prevented.
The mechanical seal device 1 is disposed between the inner peripheral surface of the housing 60 and the outer peripheral surface 56 of the rotary shaft 50.
[0034]
The mechanical seal device 1 is arranged so that the sealing ring 3 for rotation and the stationary sealing ring 10 having the same shape face each other with the sealing surface 3 symmetrical.
As shown in FIG. 2, the rotation sealing ring 2 is formed with a first inner peripheral surface 5 that fits with a rotation shaft 50 with a gap. A seal surface 3 is provided at one end of the rotary seal ring 2 and a first outer taper surface 4 is formed on the outer peripheral surface so as to diverge toward the seal surface 3 side.
Further, the rotating seal ring 2 is formed by sintering into a ring shape using a silicon carbide material. Then, the circumference of the rotary sealing ring 2 is broken into two equal parts to form a fracture surface on the divided surface 2A. The dividing surface 2A is substantially linear in the axial direction, but the fracture surface is formed with irregularities. For this reason, if this uneven divided surface 2A is joined, the fracture surface is joined to the original state, so that the divided surface 2A is held in a perfect ring shape without being displaced even if it receives a force.
The dividing surface 2A is provided with a seal layer 30 coated with rubber. The seal layer 30 is made of a material such as nitrile rubber, silicon rubber, acrylic rubber, fluoro rubber, or resin material according to the suitability of the fluid to be sealed, and is integrally formed on the divided surface 2A by coating or adhesion. The dividing surface 2A can be cut and divided not only by breakage but also by machining.
[0035]
An annular first holder 6 is disposed so as to surround the rotation sealing ring 2 with an inner peripheral surface. The first holder 6 is formed as shown in FIG. The first holder 6 is provided with a first inner tapered surface 7 that is opposed to the first outer tapered surface 4 of the rotation sealing ring 2 with a predetermined gap K therebetween. The first inner tapered surface 7 is formed so as to reduce the gap K toward the seal surface 3 with respect to the first outer tapered surface 4. This gap K is variously selected according to the design, such that both the tapered surfaces are made parallel or the gap K on the seal surface 3 side is widened.
Further, a tightening outer peripheral surface 8 is provided on the opposite side of the first inner tapered surface 7 of the first holder 6 in the axial direction, and by tightening the tightening outer peripheral surface 8, a split surface 6A described later is joined. To form a ring. Therefore, even if the outer peripheral surface 8A on the outer side on the first inner tapered surface 7 side is tightened, the two divided first holders 6 can be coupled in a ring shape, similarly to the tightening outer peripheral surface 8.
[0036]
A first O-ring 36 is disposed in the gap K between the first inner and outer tapered surfaces 4, 7 between the rotation sealing ring 2 and the first holder 6. The first O-ring 36 has a circular cross section and is formed in an annular shape. The first O-ring 36 is formed on a divided surface with one end divided, and is configured so that the divided surface can be opened from the side of the rotating shaft 50. This dividing surface is formed in the uneven | corrugated | grooved part which mutually latches. The dividing surface is cut into a surface inclined with respect to the radial surface passing through the center, and the dividing surface is bonded to form a first integrated O-ring 36 after mounting.
The first O-ring 36 is attached in a pressure contact state between the first outer tapered surface 4 and the first inner tapered surface 7 as shown in FIG. The rotating seal ring 2 is pressed toward the seal surface 3 by the elastic force of the first O-ring 36. Further, the rotary seal ring 2 is held by the first holder 6 by the frictional force of the first O-ring 36 so as not to idle. For this reason, since it is not necessary to provide a drive pin etc. and to fix the rotation sealing ring 2 to the 1st holder 6, the rotation sealing ring 2 can be formed small.
Further, the second O-ring 37 is also formed in the same shape.
As the material of the first O-ring 36 and the second O-ring 37, elastic rubber such as nitrile rubber, silicon rubber, fluorine rubber, acrylic rubber, styrene rubber, ethylene propylene rubber, and urethane rubber is used as necessary.
[0037]
Furthermore, a first fitting inner peripheral surface 9 is provided on the inner periphery of the first holder 6 with a gap from the rotation shaft 50. And even if the 1st holder 6 is clamp | tightened from an outer peripheral side, a clearance gap is formed so that the 1st fitting inner peripheral surface 9 may not contact the rotating shaft 50. FIG.
Similarly to the divided surface 2A of the rotary seal ring 2, the first holder 6 is also formed with a divided surface 6A that is broken into two equal parts. The dividing surface 6A is provided with a seal layer 30 coated with rubber. The seal layer 30 is formed by coating or bonding rubber corresponding to the suitability of the fluid to be sealed, such as nitrile rubber, silicon rubber, acrylic rubber, fluorine rubber, or resin material. Depending on the fluid to be sealed, the dividing surface 6A can be brought into close contact directly without providing a seal layer. Furthermore, the split surface may be cut by machining.
[0038]
A fastening ring 15 that is fitted to the fastening outer peripheral surface 8 of the first holder 6 and fastens the first holder 6 in a ring shape is formed on a divided surface 15A by dividing the ring into two equal parts. A plan view of the clamping ring 15 is formed as shown in FIG. As shown in FIG. 4, the fastening ring 15 has a fitting inner peripheral surface 16 that is fitted to the rotating shaft 50. Further, a taper surface is provided on one end side of the fitting inner peripheral surface 16, and an O-ring 40 is provided between the taper surface and the first holder 6 so that the fitting inner peripheral surface 16 and the first fitting are provided. The space between the joint inner peripheral surface 9 is sealed. The fitting inner peripheral surface 16 can be fastened to the rotary shaft 50 by a bolt 17 that fastens the divided surface 15A in a coupled state, thereby fixing the fastening ring 15 to the rotary shaft 50. Further, a set screw 19 may be screwed into the screw portions 18 provided at two places and fixed to the screwed rotary shaft 50.
Further, the fitting surface 20 provided at one end of the fastening ring 15 is fitted with the first fastening outer peripheral surface 8. Then, the fastening ring 15 divided by screwing the bolt 17 into the threaded portion 21 is integrally joined so as to form a ring shape. In addition, a bolt hole 22 is provided in one of the divided fastening rings 15 where the screw portion 21 is not provided, and a counterbore 29 on which the bolt head is seated is also provided. A rubber is coated on the divided surface of the tightening ring 15. However, even if rubber is not coated on the divided surfaces, there is no functional problem, and the divided surfaces can be joined as they are.
[0039]
The stationary seal ring 10 disposed opposite to the rotation seal ring 2 is provided with a relative seal surface 11 in close contact with the seal surface 3. The stationary sealing ring 10 is also formed in a shape as shown in FIG. 2, and the shape is substantially the same as that of the rotating sealing ring 2. Therefore, the rotating seal ring 2 manufactured as the rotating seal ring 2 can be used as the stationary seal ring 10. Further, the second inner peripheral surface 25 of the stationary seal ring 10 is fitted to the rotary shaft 50 with a gap in the same manner as the rotation seal ring 2. A second outer tapered surface 24 is formed on the outer peripheral surface in the same shape as the first outer tapered surface 4.
[0040]
The second holder 26 that holds the stationary seal ring 2 is formed in substantially the same shape as the first holder 6 as shown in FIG. That is, a second fitting inner peripheral surface 29 that forms a gap with the rotary shaft 50 is formed, and a second inner tapered surface 27 is formed on the inner periphery. Further, an O-ring groove is formed on the outer peripheral surface of the second holder 26 which is the same as the outer peripheral surface 8A of the first holder 6, and the O-ring 38 attached to the O-ring groove is provided on the inner peripheral surface of the housing 60. It is inserted. The second holder 26 divided by this fitting is held in a ring shape.
[0041]
Furthermore, in order to clamp and hold the second holder 26, a holding ring 31 fitted to the second tightening outer peripheral surface 28 of the second holder 26 is provided. This holding ring 31 is divided into two equal parts, and is clamped from the outer peripheral sides via two bolts 32 penetrating the divided surface as shown in FIG. The second fitting surface 35 is fitted with the second fastening outer peripheral surface 28 and the divided second holder 26 is held in an integral ring shape. The holding ring 31 is provided with a drive pin 33 and is configured to be locked in a hole provided in the housing 60 so as not to rotate.
The holding ring 31 can also be provided for auxiliary tightening of the outer peripheral surface 8A. If the second holder 26 is firmly fitted to the inner peripheral surface of the housing 60 by the O-ring 38 and held so as not to rotate, the holding ring 31 may not be provided. For this purpose, a plurality of O-rings 38 can be provided in parallel on the outer peripheral surface, and both can be firmly fitted.
[0042]
In the mechanical seal device 1 configured as described above, the rotary seal ring 2 and the stationary seal ring 10 are formed in substantially the same shape, and the first holder 6 and the second holder 26 are substantially the same. Is formed. For this reason, it becomes possible to form the whole small.
Further, the first O-ring 36 elastically presses the rotary seal ring 2 toward the seal surface 3 side, and the second O-ring 37 elastically presses the stationary seal ring 10 toward the relative seal surface 11 side. In addition, it is not necessary to attach a spring that presses against this bullet, and furthermore, the O-rings 36 and 37 hold the rotating seal ring 2 and the stationary seal ring 10 so as not to rotate. In addition, there is no need to provide a drive pin or the like for locking. For this reason, the structure is greatly simplified to facilitate assembly and disassembly. Furthermore, even when sealing a highly viscous sealed fluid, if impurities adhere, it can be easily disassembled and cleaned.
Further, since the sealing rings 2 and 10, the holders 6 and 26, the tightening ring 15, the O-rings 36 and 37, and the like are divided, the mechanical rotation can be performed from the radial direction of the rotating shaft 50 without disassembling the rotating shaft 50. It becomes possible to mount the sealing device 1. For this reason, mounting, disassembling, remounting and the like of the mechanical seal device 1 become extremely easy.
[0043]
【The invention's effect】
The mechanical seal device according to the present invention has the following excellent effects.
[0044]
According to the mechanical seal device of the first aspect of the present invention, it has an O-ring made of a rubber-like elastic material that is crimped between the first inner tapered surface and the first outer tapered surface, and the second inner tapered surface. Since it has an O-ring made of rubber-like elastic material that is pressure-bonded between the second outer taper surface, the O-ring brings the sealing surface of the rotary sealing ring into contact with the relative sealing surface of the stationary sealing ring. Acts as follows. For this reason, the spring etc. which press a sealing ring are not required.
Further, since the O-ring is strongly pressed by both tapered surfaces, no drive pin is required. Furthermore, since the rotary seal ring and the stationary seal ring have substantially the same shape, the parts can be made common and a mass production effect can be expected. Therefore, there is an effect that the number of parts of the mechanical seal device can be reduced.
Further, the pressure-bonded state of the O-ring can prevent the sealed fluid slurry and high-viscosity impurities from entering the joint surface of the O-ring, so that the sealed fluid containing the slurry or the highly-viscous sealed fluid is sealed. The effect to do.
[0045]
According to the mechanical seal device of the second aspect of the present invention, the distance between the first outer tapered surface of the rotary sealing ring and the first inner tapered surface of the holder is narrower toward the seal surface side. There is an effect that the seal surface is pressed against the relative seal surface by the elastic force of the O-ring.
Further, since the space between the stationary seal ring and the tapered surface of the second holder is also configured in the same manner, the same effect is obtained and the relative seal surface is brought into close contact with the seal surface. For this reason, since it seals uniformly so that a sealing surface and a relative sealing surface may oppose, the sealing effect outstanding compared with what is pressed from one side like the past is exhibited. Furthermore, the structure of the sealing ring can be simplified, and both can be formed in the same shape, and the cost of mass production can be reduced.
[0046]
According to the mechanical seal device of the third aspect of the present invention, each split surface is formed with irregularities that can be joined to the split surface by breaking the integrally formed ring shape in a straight line in the axial direction. When the divided surfaces are joined, they can be joined together without shifting. For this reason, the joint surface is strengthened, and the effect that the seal surface is uniformly formed without causing a step portion on the seal surface is exhibited.
[0047]
According to the mechanical seal device of the fourth aspect of the present invention, since the sealing layer is provided by coating a rubber-like elastic material on each divided surface, the seal surface is hermetically bonded if the divided surfaces are pressed. There is an effect of preventing the sealed fluid from leaking from the dividing surface.
[0048]
According to the mechanical seal device of the fifth aspect of the present invention, the first inner tapered surface of the first holder and the second inner tapered surface of the second holder are mutually stationary with the first outer tapered surface of the rotation sealing ring. Since the shape corresponds to the second outer taper surface of the sealing ring, the first holder and the second holder can be formed in the same shape. Since it is used, mass production effects can be expected, and the overall cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a mechanical seal device according to a first embodiment of the present invention.
FIG. 2 is a plan view of the rotary seal ring 2 and the stationary seal ring 10 of FIG.
FIG. 3 is a plan view of the first holder and the second holder of FIG. 1;
4 is a plan view of the clamping ring of FIG. 1. FIG.
FIG. 5 is a half cross-sectional view of a conventional mechanical seal.
FIG. 6 is a half cross-sectional view of another conventional mechanical seal.
[Explanation of symbols]
1 Mechanical seal device
2 Sealing ring for rotation
2A Dividing surface
3 Seal surface
4 First outer taper surface
5 1st inner surface
6 First holder
7 First inner taper surface
8 1st tightening outer peripheral surface
8A outer peripheral surface
9 First mating inner peripheral surface
10 Stationary seal ring
11 Relative sealing surface
15 Tightening ring
15A Dividing surface
16 Inner peripheral surface
17 volts
18 Screw part
19 Set screw
20 mating surface
21 Screw part
22 Bolt hole
24 Second outer taper surface
25 Second inner peripheral surface
26 Second holder
27 Second inner taper surface
28 Second tightening outer peripheral surface
29 Second mating inner peripheral surface
30 Sealing layer
31 retaining ring
32 volts
33 Drive pin
35 Second mating surface
36 1st O-ring
37 2nd O-ring
38 O-ring
39 O-ring groove
40 O-ring
50 axis of rotation
60 housing
K gap

Claims (4)

A mechanical seal device for sealing outflow of a fluid to be sealed between a housing having an inner peripheral surface and a rotating shaft disposed in the inner peripheral surface of the housing,
A rotating seal ring having an inner peripheral surface into which the rotating shaft is fitted and having a sealing surface at one end and a dividing surface in which the circumferential direction is separable;
A first outer tapered surface shaped to diverge toward the seal surface side on the outer periphery of the rotating seal ring;
An annular assembly having a first inner taper surface facing the first outer taper surface, a split surface whose circumferential direction is separable, and a fastening outer peripheral surface capable of tightening the split surfaces. A first holder,
It has a fitting surface that fits the fastening outer peripheral surface of the first holder so as to closely contact the divided surface of the first holder, and has an inner peripheral surface that fits on the rotating shaft, and the circumferential direction can be divided. A first clamping ring having a split surface formed;
A split surface having a relative seal surface that is substantially the same shape as the rotary seal ring and in close contact with the seal surface, an inner peripheral surface into which the rotary shaft is fitted, and a circumferential direction that is separable. A stationary sealing ring having,
A second outer taper surface that diverges toward the relative seal surface on the outer periphery of the stationary seal ring;
A second assembly having a second outer taper surface facing the second outer taper surface, a split surface whose circumferential direction is separable, and a fastening outer peripheral surface capable of tightening the split surfaces. 2 holders,
The first holder and the second holder are formed in substantially the same shape,
The first O-ring made of a rubber-like elastic material that is pressure-bonded between the first inner tapered surface and the first outer tapered surface, and is pressure-bonded between the second inner tapered surface and the second outer tapered surface. A mechanical seal device having a second O-ring made of rubber-like elastic material.   The space between the first inner taper surface and the first outer taper surface is reduced toward the seal surface side, and the space between the second inner taper surface and the second outer taper surface is on the seal surface side. The mechanical seal device according to claim 1, wherein the mechanical seal device is reduced toward the front.   The dividing surface of the sealing ring for rotation, the dividing surface of the stationary sealing ring, the dividing surface of the first holder, and the dividing surface of the second holder are formed in a torn surface where the dividing surfaces can be joined. The mechanical seal device according to claim 1, wherein the mechanical seal device is provided.   A rubber elastic elastic seal layer is provided on the dividing surface of the rotating sealing ring, the dividing surface of the stationary sealing ring, the dividing surface of the first holder, and the dividing surface of the second holder. The mechanical seal device according to claim 1, claim 2, or claim 3.

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