JP4330875B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device that improves sealing performance and reduces a friction coefficient by seal dimples provided on contact surfaces in which a seal portion and end face seals are combined in a pair and contact each other. More specifically, the present invention relates to a sealing device that effectively seals a sealed fluid that varies between high pressure and high pressure and low pressure.
[0002]
[Prior art]
As a related technique of the present invention, there is a shaft seal device 100 shown in FIG. The shaft seal device 100 is composed of a combination of an end face seal 101 and a seal ring 110.
The end face seal 101 in the shaft seal device 100 is provided with an outer peripheral portion (not shown) that is hermetically fitted to the inner peripheral surface of a housing (not shown). An elastomer lip 105 is provided on the inner peripheral side of the front surface of the end face seal 101 in the elastomer body 102. A reinforcing ring 103 is integrally bonded to the back surface of the elastomer body 102.
Further, a resin lip 104 having the same shape as the elastomer lip 105 is bonded to the elastomer body 102 on the sealed fluid side of the elastomer lip 105. On the sliding surface 106 of the resin lip 104, a thread groove 106A for pumping and sealing the sealed fluid is formed.
[0003]
On the other hand, the seal ring 110 fitted to the rotary shaft 150 is provided with a first seal surface 111 at the end. Further, the sliding surface 106 of the resin lip 104 is joined to the first seal surface 111.
Further, the elastomeric lip 105 is formed with a sealing surface 105A that joins the second sealing surface 111A.
And end face seal 10 1 The elastomer lip 105 and the resin lip 104 slide in close contact with the first and second sealing surfaces 111 and 111A of the sealing ring 110.
[0004]
In this shaft seal device 100, the resin lip 104 pushes back the sealed fluid by the pumping action of the thread groove 106A during relative sliding and seals. However, in the screw groove 106A of the resin lip 104, when the resin lip 104 is stationary or rotated, the resin lip 104 fluctuates due to leakage through the screw groove 106A to the atmosphere or the pressure of the sealed fluid. May leak. For this purpose, the elastomer lip 105 is joined to the second sealing surface 111A to seal the sealed fluid leaked from the resin lip 104.
[0005]
In this shaft seal device 100, since the resin lip 104 is bonded to the elastomer body 102, when the fluid to be sealed is at a high pressure, there are difficulties in the bonding strength and the molding process caused by the difference in material. In addition, since the resin lip 104 and the elastomer lip 105 must be provided twice, the structure is large, and when the sealed fluid has a high pressure or when the pressure of the sealed fluid fluctuates, The sealing effect as designed cannot be expected.
[0006]
Furthermore, there is a shaft seal device 200 shown in FIG. 10 as a related technique of the present invention. The shaft seal device 200 is composed of a combination of an end face seal 201 and a seal ring 210.
An end face seal 201 in the shaft seal device 200 is provided with an outer peripheral portion 202 that is hermetically fitted to the inner peripheral surface of the housing 160. The outer peripheral portion 202 is provided with a seal portion 202A protruding on the outer periphery, and when the outer peripheral portion 202 is fitted by the seal portion 202A, the gap between the fitting surfaces is sealed.
Moreover, the elastomer book of this end face seal 201 To the body On the inner peripheral side of the front surface, an elastomeric lip 205 is formed so as to protrude outwardly. A sliding surface 206 is provided on the tip side of the elastomeric lip 205. Also this elastomer book the body's A reinforcing ring 203 is integrally bonded to the back surface.
[0007]
On the other hand, the sealing ring 210 fitted to the rotating shaft 150 is formed into an annular body having an L-shaped cross section by processing a metal plate. And the sealing surface 211 is provided in the edge part which comprises a flange shape. Further, the cylindrical portion 213 on the inner peripheral side has a rotating shaft 150. In A fitting hole for fitting is provided.
Furthermore, a thread groove 211A for pumping the sealed fluid is formed on the seal surface 211 of the seal ring 210. Further, the sliding surface 206 of the elastomeric lip 205 is in contact with the thread groove 211A of the seal surface 211 so as to cover it.
When the rotating shaft 150 rotates, the sliding surface 206 of the elastomer lip 205 slides relative to the sealing surface 211 of the sealing ring 210 via the screw groove 211A, and pumps the sealed fluid to the sealed fluid side. .
[0008]
In this shaft seal device 200, when the rotating shaft 150 rotates, the elastomeric lip 205 pushes back and seals the fluid to be sealed in cooperation with the thread groove 211A provided on the seal surface 211 of the seal ring 210.
However, when the rotating shaft 150 is stationary, the screw groove 211A provided on the seal surface 211 leaks to the atmosphere side through the screw groove 211A. Alternatively, even when the rotating shaft 150 is rotating, the elastomeric lip 205 is worn by the corners of the continuous thread groove 211A, and the elastomeric lip 105 has a reduced sealing ability and a reduced durability.
Furthermore, when the fluid to be sealed becomes high pressure, the elastomeric lip 205 is deformed and cannot be brought into close contact with each other, reducing the pumping action with the thread groove 211A, and the fluid to be sealed leaks from the sliding surface 206 of the elastomeric lip 205. .
Further, when the sealed fluid has a fluctuating pressure, the elastomeric lip 205 may not be able to cope with the fluctuation and may be deformed to leak the sealed fluid.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and the technical problem to be solved by the invention is to improve the sealing ability of the sealing device and reduce the sliding resistance of the sealing surface. It is to prevent wear. Further, the sealing ability is exhibited even when various rotating devices repeatedly rotate and stop, or even when the pressure of the sealed fluid fluctuates between a high pressure and a low pressure.
Furthermore, it is to prevent the loss of power energy by reducing the sliding resistance of the sliding surfaces of the end face seal and the sealing ring.
[0010]
[Means for Solving the Problems]
The present invention has been made to solve the technical problems as described above, and the technical solution means is configured as follows.
According to a first aspect of the present invention, there is provided a sealing device according to a first aspect of the present invention, comprising: a rotating shaft inserted into a hole of a housing or a sealing ring attached to the housing in a sealed manner and having a sealing surface on an end surface; And an end face seal having a seal lip projecting from one end and in close contact with the seal face, the seal lip contacting the seal face or the seal face of the seal ring along the circumference Seal dimples having dimples for pumping the sealed fluid arranged in the above are formed.
[0011]
In the sealing device according to the first aspect of the present invention, the fluid to be sealed is interposed between the seal surface and the contact surface during sliding by the concave seal dimples provided on the seal surface of the seal ring or the contact surface of the seal lip. In addition, since it has a function of pumping the sealed fluid more than the necessary amount interposed between the seal surface and the contact surface to the sealed fluid side, wear of the contact surface of the seal lip is effectively prevented. At the same time, since the sealed fluid is pumped from between the sliding surfaces to the sealed fluid side, the sealing effect is greatly improved.
[0012]
In particular, since one of the sliding surfaces of the seal device is formed by a seal lip made of a rubber-like elastic material, when the pressure of the fluid to be sealed is high, the contact area of the seal lip with respect to the seal ring is increased. Therefore, since the number of dimples operated in the seal dimple increases, the ability to pump the sealed fluid to the sealed fluid side is improved.
[0013]
Even if fluctuating pressure is generated in the sealed fluid, the seal dimples are formed so as to be scattered on the seal surface or the contact surface. Therefore, even if the sealed fluid acts on the seal dimple, the contact surface of the seal lip The state is not adversely affected. For this reason, the contact surface of the seal lip is held in close contact with the seal surface and exhibits sealing ability.
[0014]
In the sealing device of the present invention according to claim 2, the dimple is inclined toward the inner diameter side in the rotation direction when the sealing ring rotates with respect to the rotation direction of the rotation shaft, and is inclined toward the inner side in the reverse rotation direction when the end face seal rotates. Thus, a plurality of grooves are formed on each circumferential line having different diameters and formed in a groove having a longitudinally inclined direction.
[0015]
In the sealing device according to the second aspect of the present invention, since the dimples of the seal dimple are inclined inward with respect to the rotation direction, the sealed fluid is effectively pumped to the sealed fluid side during rotation. And the sealing capability of a sealing device improves greatly. Moreover, since it is possible to cover the seal lip contact surface so as to block the radial rows of the seal dimples, it is possible to effectively prevent the sealed fluid from leaking to the atmosphere side through the dimples even when not rotating. It becomes possible to prevent.
In particular, when the fluid to be sealed becomes high in pressure, the contact area of the contact surface of the seal lip having rubber-like elasticity increases. Therefore, the contact surface of the seal lip exhibits a pumping action with respect to the many arranged dimples. The sealing ability can be improved by pushing the sealed fluid back to the sealed fluid side.
[0016]
According to a third aspect of the present invention, there is provided a sealing device according to a third aspect of the present invention, wherein a backup ring having a lip support portion is fitted to the peripheral surface of the support portion of the seal lip to support the support portion and the lip support portion protrudes from the seal lip. It is bonded and supported.
[0017]
In the sealing device according to the third aspect of the present invention, when the base part of the seal lip is supported by the lip support part, as a result of the stress analysis of the elastic deformation of the seal lip, the more the pressure of the sealed fluid acts, the more the lip seal It is possible for the contact surface of the first and second surfaces to be in close contact in parallel with the seal surface. For this reason, the effect | action which pumps the to-be-sealed fluid is improved not only with the improvement of a sealing capability.
Further, since the seal lip supported by the lip support portion can prevent the pressure contact with the seal surface more than necessary even when receiving the pressure of the fluid to be sealed, the pumping action of the fluid to be sealed is improved together with the sealing effect.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a sealing device according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Each drawing described below is created based on a design drawing in which the dimensional relationship is accurate.
[0019]
FIG. 1 is a half sectional view of a sealing device 1 showing a preferred embodiment of the present invention. FIG. 2 is a plan view of the sealing ring 11 in the sealing device 1 shown in FIG.
In FIG. 1, the sealing device 1 is configured to block the sealed fluid side A and the atmosphere side B by combining a pair of end face seals 2 and a seal portion 10.
The end face seal 2 is provided with an end face seal body 5 having an L-shaped cross section and formed in an annular shape. A seal lip 3 is formed at one end of the end face seal body 5 so as to protrude outward on the sealed fluid side. An inner peripheral coupling portion between the seal lip 3 and the end face seal body 5 is formed in the support portion 5B.
In addition, peripheral surface sealing portions are formed at two locations on the outer peripheral surface 5 </ b> A of the end surface seal body 5. And the peripheral surface sealing part of the end surface seal body 5 is closely fitted to the inner peripheral surface of the housing 60. The end face seal body 5 is made of a rubber material. Further, a reinforcing ring 4 is embedded in the end face seal body 5, and the reinforcing ring 4 reinforces the entire end face seal 2. Further, the reinforcing ring 4 reinforces the support portion 5B by an inner peripheral support portion 4A protruding in a cylindrical shape from the inner periphery of the L-shaped cross section.
[0020]
The seal lip 3 supported by the inner peripheral support portion 4A is inclined outward from the sealed fluid side A so as to diverge toward the seal surface 11B of the seal ring 11. The contact surface 3A on the inner periphery on the front end side of the seal lip 3 is in contact with the opposing seal surface 11B with an elastic force. Since the seal lip 3 is deformed so that the inclination angle becomes smaller in the horizontal direction when receiving the pressure of the sealed fluid from the outer peripheral side, the contact surface 3A is pressed against the seal surface 11B so as to expand the contact area. To do.
The end face seal body 5 and the seal lip 3 are made of a rubber material. This rubber material is selected according to the type of fluid to be sealed. For example, it is formed of rubber or synthetic resin such as nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), acrylic rubber (ACM), silicon rubber (VMQ) fluorine rubber (FKM), polytetrafluoroethylene (PTFE), etc. Yes.
[0021]
In order to hold the seal lip 3, a support portion 5B on the base portion side of the seal lip 3 is supported by a backup ring 7 having a U-shaped cross section. The backup ring 7 is provided with a lip support portion 7A on the seal lip 3 side. The free end side of the lip support portion 7A is bent in an arc shape to support the base portion of the seal lip 3. Further, the caulking portion 7B opposite to the lip support portion 7A of the backup ring 7 is bent so as to hold the holding plate 8. The holding plate 8 supports the reinforcing ring 4 and the lip support portion 7 so as to be connected via the rubber portion of the end face seal body 5.
[0022]
Next, the sealing ring 11 constituting the seal portion 10 is fitted to the rotary shaft 50 so as to be integrally rotatable with the rotary shaft 50. Further, the sealing ring 11 is provided with an O-ring mounting groove 11C on the inner peripheral surface 11A. The O-ring mounting groove 11C is provided with an O-ring 19 that seals between the fitting between the inner peripheral surface 11A and the rotary shaft 50.
[0023]
A sealing surface 11B is provided on the radial end surface of the sealing ring 11. The seal surface 11B has a number of first dimples 12A on the same diameter line. Pieces They are arranged in a certain shape.
FIG. 2 shows the sealing surface 11 of the sealing ring 11. B The arrangement of the seal dimples 12 provided in FIG. Then, the sealing ring 11 rotates counterclockwise N1 in the state of FIG.
[0024]
Seal dimples 12 are arranged on the seal surface 11B of the seal ring 11 as shown in the figure. A large number of first dimples 12A constituting the seal dimple 12 have a rectangular shape when viewed from above. The arrangement of the rectangular first dimples 12A is 30 ° from the tangential direction with respect to the circumferential line in the rotational direction N1 of the seal surface 11B, and the tip in the rotational direction is inclined toward the inner peripheral side. The inclination angle C of the first dimple 12A is 10 ° to 80 °, preferably 16 ° to 55 °.
Each of the first dimples 12A formed in this way has six dimples arranged in a uniform manner along a radial line to form a dimple row.
Further, the dimple rows are arranged radially on the seal surface 11B. And the first dimple 12A Are arranged in a slanted manner on each of the six circumferential lines having different diameters. The number of assembled first dimples 12A on the seal surface 11B constitutes the seal dimple 12.
Further, a flat seal surface can be formed on the outer peripheral surface of the seal surface 11B where the seal lip 3 does not contact without forming the first dimple 12A.
[0025]
The sealing ring 11 is formed in a ring shape having an outer diameter D1 and an inner diameter D2. The range of R1 to R2 on the seal surface 11B of the seal ring 11 is such that the contact surface 3A contacts with the pressure of the sealed fluid not acting on the seal lip 3. First The contact range S1.
Further, the range of R1 to Rh2 of the seal surface 11B is such that the contact surface 3A contacts when a high-pressure sealed fluid acts on the seal lip 3. Second This is the contact range S2.
[0026]
The seal ring 11 can be manufactured from a hard material such as cemented carbide, silicon carbide, or ceramic. In particular, it is a suitable material if the sealing ring 11 is made of silicon carbide or the like. That is, silicon carbide improves the strength of the sealing ring 11 and improves the wear resistance of the sliding surface. At the same time, it is easy to form the seal dimple 12.
On the other hand, in the sintered material in which pores are formed in the entire sintering as in the prior art, the contact surface of the seal lip 3 as the contact partner is worn, and furthermore, the sealed fluid or lubricating oil penetrates the sliding material. There is a problem of leakage. However, the sealing ring 11 of the present invention effectively improves such problems.
[0027]
The sealing surface of this sealing ring 11 11B One of the processing methods for forming the seal dimple 12 is a sand blasting method in which a photosensitive film for sand blasting is attached to the sliding surface for processing.
In this sand blasting method, a sand blasting photosensitive film is exposed by attaching a photosensitive film for sand blasting to the seal surface 11B, and bringing a positive film in which the shape of the seal dimple 12 is baked into close contact. Thereafter, the photosensitive film for sandblasting is developed, and the surface is sandblasted to form a seal dimple 12 that matches the pattern of the positive film.
[0028]
As the shape of the first dimple 12A, a rectangular end (not shown) formed in a semicircular shape was implemented. Further, a rectangular shape not shown in the figure was implemented as the second embodiment.
The rectangular shape of the first dimple 12A Width is 150 × 10 −6 m to 1000 × 10 −6 m. this Width Specific examples include 150 × 10 −6 m and 250 × 10 −6 m. The length of the first dimple 12A in the longitudinal direction Saha , Width It is 2 times or more, and is formed below the width dimension of the seal surface 11B. For example, the specific first dimple 12A length As 600 × 10 −6 m and 1000 × 10 −6 m. The depth of the first dimple 12A is formed to a size of 1 × 10 −6 m to 25 × 10 −6 m. As a result of the experiment, the sealing ring 11 provided with the first dimple 12A having such a shape has a sealing effect 4 to 6 times that of the sealing ring 11 not provided with the first dimple 12A.
[0029]
The seal ring 11 is attached to a step portion of the rotary shaft 50 and is fixed by being pressed against one side by a sleeve 20 having a fitting surface 20A fitted to the rotary shaft 50. An unillustrated end portion of the sleeve 20 is fixed to the rotary shaft 50 via a bolt. Further, a gap between the sleeve 20 and the backup ring 7 is formed in a gap.
The first embodiment described above is a case where the sealing ring 11 rotates. On the other hand, other embodiments are not shown, but the outer periphery of the sealing ring 11 is fitted into the hole of the housing 60 in a sealed manner, and the inner peripheral surface of the opposed end face seal 2 is fitted into the step portion of the rotating shaft 50. . In this case, in FIG. 2, the end face seal 2 rotates in the clockwise (clockwise) direction. Then, with the rotation of the end face seal 2, the sealed fluid is pumped to the sealed fluid side A by the seal dimple 12, as in the first embodiment.
[0030]
FIG. 3 is a half cross-sectional view of the mounting state of the seal device showing the second embodiment according to the present invention. FIG. 4 is a half sectional view showing a state where the pressure of the fluid to be sealed is applied to the sealing device showing the second embodiment according to the present invention. 5 is a partial plan view showing a contact state between the sealing ring 11 and the sealing lip 3 of the sealing device 1 of FIG. 6 is a partial plan view showing a contact state between the sealing ring 11 and the sealing lip 3 of the sealing device 1 of FIG.
In the sealing device 1 shown in FIG. 3 and FIG. 4, the same components as those of the sealing device 1 shown in FIG.
[0031]
In the sealing device 1, the sealed fluid side A has a high pressure, and the atmosphere side B has a low pressure. Further, it is suitable when the sealed fluid fluctuates between high pressure and low pressure while the rotating shaft 50 is stopped or rotating.
3 and FIG. 4 is different from the configuration of the sealing device 1 shown in FIG. Formed.
The sealing device 1 shown in FIG. 3 is in a state where the sealed fluid does not act or the low-pressure sealed fluid acts on the seal lip 3. This action state is, for example, a state where the operation of the sealed fluid is stopped.
The seal lip 3 is in a state in which almost no pressure is applied by contacting the seal surface 11B of the seal ring 11. In this state, the first contact range S1 indicates that the contact surface 3A of the seal lip 3 is in contact with the range of R1 to R2.
As shown in FIG. 5, the first contact range S1 of the seal lip 3 is in contact with the first dimple 12A on the outer circumferential line and the first dimple 12A on the inner circumference. Yes. For this reason, even when the rotating shaft 50 is stopped, the sealed fluid can be sealed by the contact between the contact surface 3A of the seal lip 3 and the seal surface 11B.
[0032]
The sealing device 1 shown in FIG. 4 is in a state where the sealed fluid has shifted to a high pressure from the state of FIG. When subjected to the action of the high-pressure sealed fluid, the seal lip 3 is elastically deformed as shown in FIG. And as shown in FIG. 6, contact range 3A of the contact surface 3A of the seal lip 3 is expanded to the range of Rh1-Rh2. Since the number of the first dimples 12A within the expanded contact range S2 increases, the flow of the sealed fluid can be pumped in a large amount by the action of each first dimple 12A.
Further, since the base portion of the seal lip 3 is supported by the lip support portion 7A, the contact surface 3A of the seal lip 3 is in contact with the seal surface 11B in parallel with the pressure of the sealed fluid. It is elastically deformed. For this reason, the pumping action is improved by the elastically deformed plane of the seal lip 3, and the sealing ability is also improved.
3, 4, 5, and 6, the sealing ring 11 is used for rotation. However, the sealing ring 11 may be attached to a fixed part such as a housing and the end face seal 2 may be attached to the rotating shaft. Is possible. Also in this case, the function and effect are the same as described above in which the sealing ring 11 is used for rotation.
[0033]
The seal ring 11 in FIG. 7 is a plan view showing another embodiment. The seal dimples 12 of the seal ring 11 are arranged in the circumferential direction so that the first dimple 12A and the second dimple 12B face each other to form a C shape. With this configuration, even when the rotary shaft 50 rotates in both forward and reverse directions, the sealed fluid is pumped to the sealed fluid side by the first dimple 12A for forward rotation and the second dimple 12B for reverse rotation. It becomes possible to do.
This sealing ring 11 can be attached to a fixed part. It can also be attached to a rotating shaft. The sealing ring 11 and the end face seal 2 exhibit a sealing effect as well as a lubricating effect both in the forward rotation and in the reverse rotation.
[0034]
FIG. 8 is a plan view of the sealing ring 11 in still another embodiment.
As shown in FIG. 8, the second dimple 12B is provided outside the seal surface 11B, and the first dimple 12A is provided inside the seal surface 11B. The number of the first dimples 12A and the second dimples 12B in one row is not limited to that shown in the figure, and the number is selected according to the design. Then, the sealed fluid is drawn in the inner diameter direction by the second dimple 12B, and the sealed fluid is pumped by the first dimple 12A. Such an arrangement of the dimples 12A and 12B improves the sealing performance as well as the lubricating effect of the seal surface 11B.
In FIG. 8, the rotation direction of the arrow N1 is the direction in which the sealing ring 11 rotates. Further, when the end face seal 2 rotates, the end face seal 2 rotates in the reverse clockwise direction.
[0035]
【The invention's effect】
The sealing device according to the present invention has the following excellent effects.
The seal dimple provided on the contact surface between the seal ring and the seal lip of the seal device causes a fluid to be sealed to intervene between the seal surface and the contact surface during sliding, and is interposed between the seal surface and the contact surface. Since it has a function of pumping the sealed fluid in excess of the necessary amount to the sealed fluid side, it is possible to effectively prevent the contact surface of the seal lip from being worn.
At the same time, since the sealed fluid is pumped from the contact surface to the sealed fluid side, the sealing effect is dramatically improved (the sealing ability is improved several times compared to the shaft seal device as shown in FIG. 10).
[0036]
In particular, when the pressure of the fluid to be sealed is high due to the sealing lip of rubber-like elastic material on one side of the sealing device, the sealing area of the sealing lip is increased because the pressure is high and the sliding area of the sealing lip is increased. Since the number of dimples to be pumped by the dimple increases, the ability to pump the sealed fluid to the sealed fluid side is improved.
[0037]
Also, even if fluctuating pressure occurs in the sealed fluid, the seal dimples are formed so as to be scattered in one direction on the seal surface or sliding surface. It becomes good for. For this reason, the state close to the sealing surface is maintained and the sealing ability is exhibited.
[0038]
Further, by supporting the seal lip by the lip support portion, even if the pressure of the sealed fluid acts on the seal lip, the seal lip contact surface is brought into intimate contact with the seal surface, thereby improving the sealing effect of the sealed fluid. Along with the improvement, the effect of pumping the sealed fluid is exhibited.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a sealing device showing a first embodiment according to the present invention.
FIG. 2 is a plan view of a sealing ring provided in the sealing device shown in FIG.
FIG. 3 is a half cross-sectional view showing a mounting state of a seal device showing a second embodiment according to the present invention.
FIG. 4 is a half cross-sectional view showing a state in which a high-pressure sealed fluid is applied to a sealing device according to a second embodiment of the present invention.
5 is a partial plan view showing a contact state between a seal ring and a seal lip shown in FIG. 3;
6 is a partial plan view showing a contact state between a seal ring and a seal lip shown in FIG. 4;
FIG. 7 is a plan view showing another embodiment of a sealing ring according to the present invention.
FIG. 8 is a plan view showing still another embodiment of the sealing ring according to the present invention.
FIG. 9 is a partial cross-sectional view showing a shaft seal device of related technology according to the present invention.
FIG. 10 is a half cross-sectional view showing a shaft seal device of related technology according to the present invention.
[Explanation of symbols]
1 Sealing device
2 End face seal
3 Seal lip
3A contact surface
4 Reinforcement ring
4A Inner circumference support part
5 End seal body
5A outer peripheral surface
5B Support section
7 Backup ring
7A Lip support
7B Caulking club
8 Retained version
10 Sealing part
11 Sealing ring
11A Inner peripheral surface
11B Seal surface
11C O-ring mounting groove
12 Seal dimple
12A 1st dimple
12B 2nd dimple
19 O-ring
20 sleeve
20A mating surface
A Sealed fluid side
B Atmosphere side
S1 First contact range
S2 Second contact range

Claims (2)

A rotating shaft inserted into a hole of the housing or a sealing ring attached to the housing in a sealed manner and having a sealing surface on a radial end surface;
A contact surface is formed on one end of the end face seal body in which the reinforcing ring is embedded and is in close contact with the seal face on the inner periphery of the front end side while being fitted to the housing or the rotary shaft so as to face the seal ring. And a rubber end face seal having a sealing lip,
Wherein the sealing surface of the seal ring, the plurality Resid Lumpur apparatus seal dimples are formed with dimples to pump the sealed fluid are arranged along the circumferential surface,
Each of the dimples has a semicircular shape at both ends of the rectangle,
When the seal ring rotates with respect to the rotation direction of the rotation shaft, the seal ring is inclined toward the inner diameter side in the rotation direction, and when the end face seal rotates, the seal ring is inclined toward the inner side in the reverse rotation direction.
The dimples are arranged along a plurality of circumferential lines having different diameters by further arranging a plurality of dimple rows in which a plurality of dimples are arranged along a radial line.
In the arrangement range of the seal dimples formed in the range where the seal lip contacts, each dimple is blocked between the outer circumferential surface and the inner circumferential surface by contact with the contact surface of the seal lip. A sealing device . The support portion on the base side of the seal lip is supported by a U-shaped backup ring having a lip support portion.
The free end side of the lip support portion of the backup ring is bent in an arc shape to support the base portion of the seal lip, and the side opposite to the lip support portion is interposed through the rubber portion of the end face seal body. The sealing device according to claim 1, wherein a holding plate for connecting and holding the reinforcing ring and the lip support portion is supported .

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